stage3/constant_folding.cc
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Tue, 28 Jun 2016 13:34:29 +0000
branchfix_compilation_warnings
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parent 990 4c235d65afdd
child 1041 56ebe2a31b5b
permissions -rw-r--r--
Created new branch fix_compilation_warnings
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2012       Manuele Conti (conti.ma@alice.it)
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/* TODO: 
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 *         - Add support for comparison (= and !=) of enumeration literals!
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 *              We will need to add another const_value entry to the symbol_c, containing the 
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 *              possible enumeration value of the enum constant!
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 *              Doing this will allow us to more easily implement a constant_propagation_c later on!
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 *
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 *         - Add support for comparison (= and !=) of the exact same variable
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 *                (e.g. if (int_v = int_v) then ...)
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 */
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/* Do constant folding...
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 *
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 * I.e., Determine the value of all expressions in which only constant values (i.e. literals) are used.
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 * The (constant) result of each operation is stored (annotated) in the respective operation symbol 
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 * (e.g.: add_expression_c) in the abstract syntax tree,
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 *
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 * For example:
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 *       2 + 3         -> the constant value '5'    is stored in the add_expression_c symbol.
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 *       22.2 - 5.0    -> the constant value '17.2' is stored in the add_expression_c symbol.
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 *       etc...
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 *
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 *
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 * NOTE 1 
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 *      Some operations and constants can have multiple data types. For example,
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 *        1 AND 0
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 *      may be either a BOOL, BYTE, WORD or LWORD.
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 *
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 *      The same happens with 
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 *        1 + 2
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 *      which may be signed (e.g. INT) or unsigned (UINT)
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 *
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 *      For the above reason, instead of storing a single constant value, we actually store 4:
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 *        - bool
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 *        - uint64
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 *        -  int64
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 *        - real64
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 *
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 *      Additionally, since the result of an operation may result in an overflow, we actually
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 *      store the result inside a struct (defined in absyntax.hh)
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 *
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 *             ** During stage 3 (semantic analysis/checking) we will be doing constant folding.
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 *              * That algorithm will anotate the abstract syntax tree with the result of operations
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 *              * on literals (i.e. 44 + 55 will store the result 99).
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 *              * Since the same source code (e.g. 1 + 0) may actually be a BOOL or an ANY_INT,
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 *              * or an ANY_BIT, we need to handle all possibilities, and determine the result of the
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 *              * operation assuming each type.
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 *              * For this reason, we have one entry for each possible type, with some expressions
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 *              * having more than one entry filled in!
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 *              **
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 *             typedef enum { cs_undefined,   // not defined --> const_value is not valid!
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 *                            cs_const_value, // const value is valid
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 *                            cs_overflow     // result produced overflow or underflow --> const_value is not valid!
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 *                          } const_status_t;
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 *    
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 real64_t       value; 
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 *             } const_value_real64_t;
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 *             const_value_real64_t *const_value_real64; // when NULL --> UNDEFINED
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 *             
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 int64_t        value; 
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 *             } const_value_int64_t;
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 *             const_value_int64_t *const_value_int64; // when NULL --> UNDEFINED
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 *             
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 uint64_t       value; 
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 *             } const_value_uint64_t;
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 *             const_value_uint64_t *const_value_uint64; // when NULL --> UNDEFINED
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 *             
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 bool           value; 
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 *             } const_value_bool_t;
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 *             const_value_bool_t *const_value_bool; // when NULL --> UNDEFINED
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 *
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 *
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 *
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 * NOTE 2 
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 *    This file does not print out any error messages!
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 *    We cannot really print out error messages when we find an overflow. Since each operation
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 *    (symbol in the abstract syntax tree for that operation) will have up to 4 constant results,
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 *    it may happen that some of them overflow, while other do not.
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 *    We must wait for data type checking to determine the exact data type of each expression
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 *    before we can decide whether or not we should print out an overflow error message.
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 *
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 *    For this reason, this visitor merely annotates the abstract syntax tree, and leaves the
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 *    actually printing of errors for the print_datatype_errors_c class!
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 *
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 * NOTE 3
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 *    Constant Folding class is extended with a implementation constant propagation algorithm
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 *    by Mario de Sousa.
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 *    Main idea is not to implement a general constant propagation algorithm but to reinterpret it
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 *    for visitor classes.
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 *    We declared a hash map, it contains a variables list linked with current constant values.
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 *    During expression evaluation we can retrieve a constant value to symbolic variables getting it from the map.
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 *    Also at join source points we use a meet semilattice rules to merge current values between a block
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 *    and adjacent block.
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 *
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 */
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#include "constant_folding.hh"
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#include <stdlib.h> /* required for malloc() */
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#include <string.h>  /* required for strlen() */
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// #include <stdlib.h>  /* required for atoi() */
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#include <errno.h>   /* required for errno */
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#include "../main.hh" // required for uint8_t, real_64_t, ..., and the macros NAN, INFINITY, INT8_MAX, REAL32_MAX, ... */
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#define FIRST_(symbol1, symbol2) (((symbol1)->first_order < (symbol2)->first_order)   ? (symbol1) : (symbol2))
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#define  LAST_(symbol1, symbol2) (((symbol1)->last_order  > (symbol2)->last_order)    ? (symbol1) : (symbol2))
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#define STAGE3_ERROR(error_level, symbol1, symbol2, ...) {                                                                  \
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  if (current_display_error_level >= error_level) {                                                                         \
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    fprintf(stderr, "%s:%d-%d..%d-%d: error: ",                                                                             \
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            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
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                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
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    fprintf(stderr, __VA_ARGS__);                                                                                           \
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    fprintf(stderr, "\n");                                                                                                  \
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    error_count++;                                                                                                     \
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  }                                                                                                                         \
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}
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#define STAGE3_WARNING(symbol1, symbol2, ...) {                                                                             \
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    fprintf(stderr, "%s:%d-%d..%d-%d: warning: ",                                                                           \
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            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
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                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
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    fprintf(stderr, __VA_ARGS__);                                                                                           \
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    fprintf(stderr, "\n");                                                                                                  \
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    warning_found = true;                                                                                                   \
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}
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#define SET_CVALUE(dtype, symbol, new_value)  ((symbol)->const_value._##dtype.set(new_value))
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#define GET_CVALUE(dtype, symbol)             ((symbol)->const_value._##dtype.get())
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#define SET_OVFLOW(dtype, symbol)             ((symbol)->const_value._##dtype.set_overflow())
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#define SET_NONCONST(dtype, symbol)           ((symbol)->const_value._##dtype.set_nonconst())
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#define VALID_CVALUE(dtype, symbol)           ((symbol)->const_value._##dtype.is_valid())
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#define IS_OVFLOW(dtype, symbol)              ((symbol)->const_value._##dtype.is_overflow())
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#define IS_NONCONST(dtype, symbol)            ((symbol)->const_value._##dtype.is_nonconst())
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#define IS_UNDEFINED(dtype, symbol)           ((symbol)->const_value._##dtype.is_undefined())
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#define ISZERO_CVALUE(dtype, symbol)          ((symbol)->const_value._##dtype.is_zero())
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612
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#define ISEQUAL_CVALUE(dtype, symbol1, symbol2) \
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	(VALID_CVALUE(dtype, symbol1) && VALID_CVALUE(dtype, symbol2) && (GET_CVALUE(dtype, symbol1) == GET_CVALUE(dtype, symbol2))) 
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#define DO_BINARY_OPER(oper_type, operation, res_type, operand1, operand2) {                                              \
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	if      (VALID_CVALUE(oper_type, operand1) && VALID_CVALUE(oper_type, operand2))                                  \
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		{SET_CVALUE(res_type, symbol, GET_CVALUE(oper_type, operand1) operation GET_CVALUE(oper_type, operand2));}\
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	else if (IS_OVFLOW   (oper_type, operand1) || IS_OVFLOW   (oper_type, operand2))                                  \
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		{SET_OVFLOW(res_type, symbol);}  /* does it really make sense to set OVFLOW when restype is boolean??  */ \
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	else if (IS_NONCONST (oper_type, operand1) || IS_NONCONST (oper_type, operand2))                                  \
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		{SET_NONCONST(res_type, symbol);}                                                                         \
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}
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#define DO_UNARY_OPER(dtype, operation, operand) {                                                                        \
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	if      (VALID_CVALUE(dtype, operand))                                                                            \
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		{SET_CVALUE(dtype, symbol, operation GET_CVALUE(dtype, operand));}                                        \
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	else if (IS_OVFLOW   (dtype, operand))                                                                            \
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		{SET_OVFLOW(dtype, symbol);}                                                                              \
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	else if (IS_NONCONST (dtype, operand))                                                                            \
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		{SET_NONCONST(dtype, symbol);}                                                                            \
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}
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/* Constant Propagation: Rules for Meet from "Cooper K., Torczon L. - Engineering a Compiler, Second Edition - 2011"
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 * at 9.3 Static Single-Assignment Form  page 517
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 * - any * undefined = any
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 * - any * non_const = non_const
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 * - constant * constant = constant  (if equal)
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 * - constant * constant = non_const (if not equal)
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 */
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#define COMPUTE_MEET_SEMILATTICE(dtype, c1, c2, resValue) {\
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		if (( c1._##dtype.get()  != c2._##dtype.get() && c2._##dtype.is_valid() && c1._##dtype.is_valid()) ||\
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		    ( c1._##dtype.is_nonconst() && c2._##dtype.is_valid() ) ||\
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		    ( c2._##dtype.is_nonconst() && c1._##dtype.is_valid() )) {\
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			resValue._##dtype.set_nonconst();\
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		} else {\
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			resValue._##dtype.set(c1._##dtype.get());\
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		}\
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}
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***            convert string to numerical value                    ***/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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  /* To allow the compiler to be portable, we cannot assume that int64_t is mapped onto long long int,
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   * so we cannot call strtoll() and strtoull() in extract_int64() and extract_uint64().
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   *
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   * So, we create our own strtouint64() and strtoint64() functions.
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   * (We actually call them matiec_strtoint64() so they will not clash with any function
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   *  that may be added to the standard library in the future).
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   * We actually create several of each, and let the compiler choose which is the correct one,
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   * by having it resolve the call to the overloaded function. For the C++ compiler to be able
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   * to resolve this ambiguity, we need to add a dummy parameter to each function!
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   *
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   * TODO: support platforms (where the compiler will run) in which int64_t is mapped onto int !!
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   *       Is this really needed?
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   *       Currently, when trying to compile matiec on sych a platform, the C++ compiler will not
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   *       find any apropriate matiec_strtoint64() to call, so matiec will not be able to be compiled.
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   *       If you need this, you are welcome to fix it yourself...
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   */
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static  int64_t matiec_strtoint64 (         long      int *dummy, const char *nptr, char **endptr, int base) {return strtol  (nptr, endptr, base);}
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static  int64_t matiec_strtoint64 (         long long int *dummy, const char *nptr, char **endptr, int base) {return strtoll (nptr, endptr, base);}
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static uint64_t matiec_strtouint64(unsigned long      int *dummy, const char *nptr, char **endptr, int base) {return strtoul (nptr, endptr, base);}
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static uint64_t matiec_strtouint64(unsigned long long int *dummy, const char *nptr, char **endptr, int base) {return strtoull(nptr, endptr, base);}
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/* extract the value of an integer from an integer_c object !! */
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/* NOTE: it must ignore underscores! */
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/* NOTE: To follow the basic structure used throughout the compiler's code, we should really be
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 * writing this as a visitor_c (and do away with the dynamic casts!), but since we only have 3 distinct 
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 * symbol class types to handle, it is probably easier to read if we write it as a standard function... 
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 */
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int64_t extract_int64_value(symbol_c *sym, bool *overflow) {
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  int64_t      ret;
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  std::string  str = "";
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  char        *endptr;
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  const char  *value = NULL;
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  int          base;
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  integer_c         *integer;
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  hex_integer_c     *hex_integer;
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  octal_integer_c   *octal_integer;
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  binary_integer_c  *binary_integer;
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   if       ((integer        = dynamic_cast<integer_c *>(sym))        != NULL) {value = integer       ->value + 0; base = 10;}
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   else  if ((hex_integer    = dynamic_cast<hex_integer_c *>(sym))    != NULL) {value = hex_integer   ->value + 3; base = 16;}
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   else  if ((octal_integer  = dynamic_cast<octal_integer_c *>(sym))  != NULL) {value = octal_integer ->value + 2; base =  8;}
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   else  if ((binary_integer = dynamic_cast<binary_integer_c *>(sym)) != NULL) {value = binary_integer->value + 2; base =  2;}
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   else  ERROR;
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  for(unsigned int i = 0; i < strlen(value); i++)
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    if (value[i] != '_')  str += value[i];
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  errno = 0; // since strtoXX() may legally return 0, we must set errno to 0 to detect errors correctly!
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  ret = matiec_strtoint64((int64_t *)NULL, str.c_str(), &endptr, base);
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  if (overflow != NULL)
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    *overflow = (errno == ERANGE);
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  if (((errno != 0) && (errno != ERANGE)) || (*endptr != '\0'))
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    ERROR;
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  return ret;
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}
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601
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uint64_t extract_uint64_value(symbol_c *sym, bool *overflow) {
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  uint64_t     ret;
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  std::string  str = "";
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  char        *endptr;
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  const char  *value = NULL;
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  int          base;
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  integer_c         *integer;
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  hex_integer_c     *hex_integer;
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  octal_integer_c   *octal_integer;
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  binary_integer_c  *binary_integer;
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   if       ((integer        = dynamic_cast<integer_c *>(sym))        != NULL) {value = integer       ->value + 0; base = 10;}
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   else  if ((hex_integer    = dynamic_cast<hex_integer_c *>(sym))    != NULL) {value = hex_integer   ->value + 3; base = 16;}
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   else  if ((octal_integer  = dynamic_cast<octal_integer_c *>(sym))  != NULL) {value = octal_integer ->value + 2; base =  8;}
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   else  if ((binary_integer = dynamic_cast<binary_integer_c *>(sym)) != NULL) {value = binary_integer->value + 2; base =  2;}
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   else  ERROR;
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  for(unsigned int i = 0; i < strlen(value); i++)
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    if (value[i] != '_')  str += value[i];
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  errno = 0; // since strtoXX() may legally return 0, we must set errno to 0 to detect errors correctly!
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  ret = matiec_strtouint64((uint64_t *)NULL, str.c_str(), &endptr, base);
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  if (overflow != NULL)
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    *overflow = (errno == ERANGE);
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  if (((errno != 0) && (errno != ERANGE)) || (*endptr != '\0'))
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    ERROR;
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  return ret;
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}
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/* extract the value of a real from an real_c object !! */
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/* NOTE: it must ignore underscores! */
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/* From iec_bison.yy
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 *  real:
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 *   real_token		{$$ = new real_c($1, locloc(@$));}
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 * | fixed_point_token	{$$ = new real_c($1, locloc(@$));}
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 *
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 * From iec_flex.ll
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 * {real}			{yylval.ID=strdup(yytext); return real_token;}
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 * {fixed_point}		{yylval.ID=strdup(yytext); return fixed_point_token;}
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 *
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 * real		{integer}\.{integer}{exponent}
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 * fixed_point		{integer}\.{integer}
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   358
 * exponent        [Ee]([+-]?){integer}
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   359
 * integer         {digit}((_?{digit})*)
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   360
 */
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   361
real64_t extract_real_value(symbol_c *sym, bool *overflow) {
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   362
  std::string str = "";
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   363
  real_c *real_sym;
633
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   364
  fixed_point_c *fixed_point_sym;
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   365
  char   *endptr;
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   366
  real64_t ret;
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   367
633
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   368
  if ((real_sym = dynamic_cast<real_c *>(sym)) != NULL) {
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   369
	for(unsigned int i = 0; i < strlen(real_sym->value); i++)
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   370
      if (real_sym->value[i] != '_') str += real_sym->value[i];
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   371
  }
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   372
  else if ((fixed_point_sym = dynamic_cast<fixed_point_c *>(sym)) != NULL) {
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   373
    for(unsigned int i = 0; i < strlen(fixed_point_sym->value); i++)
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   374
      if (fixed_point_sym->value[i] != '_') str += fixed_point_sym->value[i];
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   375
  }
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   376
  else ERROR;
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   377
    
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   378
  errno = 0; // since strtoXX() may legally return 0, we must set errno to 0 to detect errors correctly!
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   379
  #if    (real64_tX  == float)
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   380
    ret = strtof(str.c_str(),  &endptr);
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   381
  #elif  (real64_tX  == double)
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   382
    ret = strtod(str.c_str(),  &endptr);
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   383
  #elif  (real64_tX  == long_double)
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   384
    ret = strtold(str.c_str(), &endptr);
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   385
  #else 
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   386
    #error Could not determine which data type is being used for real64_t (defined in main.hh). Aborting!
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   387
  #endif
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   388
  if (overflow != NULL)
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   389
    *overflow = (errno == ERANGE);
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   390
  if (((errno != 0) && (errno != ERANGE)) || (*endptr != '\0'))
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   391
    ERROR;
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   392
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   393
  return ret;
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   394
}
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   395
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   396
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   397
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   398
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   399
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   400
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   401
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   402
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   403
/***        Functions to check for overflow situation                ***/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   404
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   405
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   406
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   407
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   408
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   409
/* NOTE:
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   410
 *   Most of the conditions to detect overflows on signed and unsigned integer operations were adapted from
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   411
 *   https://www.securecoding.cert.org/confluence/display/seccode/INT32-C.+Ensure+that+operations+on+signed+integers+do+not+result+in+overflow?showComments=false
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   412
 *   https://www.securecoding.cert.org/confluence/display/seccode/INT30-C.+Ensure+that+unsigned+integer+operations+do+not+wrap
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   413
 */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   414
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   415
/* NOTE: If at all possible, all overflow tests are done by pre-condition tests, i.e. tests that 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   416
 *       can be run _before_ the operation is executed, and therefore without accessing the result!
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   417
 *
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   418
 *       The exception is for real/floating point values, that simply test if the result is NaN (not a number).
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   419
 */
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   420
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   421
/* res = a + b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   422
static void CHECK_OVERFLOW_uint64_SUM(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   423
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   424
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   425
	/* Test by post-condition: If sum is smaller than either operand => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   426
	// if (GET_CVALUE(uint64, res) < GET_CVALUE(uint64, a))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   427
	/* Test by pre-condition: If (UINT64_MAX - a) < b => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   428
	if ((UINT64_MAX - GET_CVALUE(uint64, a)) < GET_CVALUE(uint64, b))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   429
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   430
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   431
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   432
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   433
/* res = a - b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   434
static void CHECK_OVERFLOW_uint64_SUB(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   435
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   436
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   437
	/* Test by post-condition: If diference is larger than a => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   438
	// if (GET_CVALUE(uint64, res) > GET_CVALUE(uint64, a))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   439
	/* Test by pre-condition: if b > a => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   440
	if (GET_CVALUE(uint64, b) > GET_CVALUE(uint64, a))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   441
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   442
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   443
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   444
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   445
/* res = a * b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   446
static void CHECK_OVERFLOW_uint64_MUL(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   447
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   448
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   449
	/* Test by pre-condition: If (UINT64_MAX / a) < b => overflow! */
786
c370918ca7fb Fix divide by 0 bug.
Mario de Sousa <msousa@fe.up.pt>
parents: 783
diff changeset
   450
	if (0 == GET_CVALUE(uint64, a))
c370918ca7fb Fix divide by 0 bug.
Mario de Sousa <msousa@fe.up.pt>
parents: 783
diff changeset
   451
		return; // multiplying by 0 will always result in 0, a valid result!	  
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   452
	if ((UINT64_MAX / GET_CVALUE(uint64, a)) < GET_CVALUE(uint64, b))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   453
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   454
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   455
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   456
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   457
/* res = a / b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   458
static void CHECK_OVERFLOW_uint64_DIV(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   459
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   460
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   461
	if (GET_CVALUE(uint64, b) == 0) /* division by zero! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   462
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   463
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   464
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   465
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   466
/* res = a MOD b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   467
static void CHECK_OVERFLOW_uint64_MOD(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   468
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   469
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   470
	/* no overflow condition exists, including division by zero, which IEC 61131-3 considers legal for MOD operation! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   471
	if (false) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   472
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   473
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   474
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   475
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   476
/* res = - a */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   477
static void CHECK_OVERFLOW_uint64_NEG(symbol_c *res, symbol_c *a) {
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   478
	/* The only legal operation is res = -0, everything else is an overflow! */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   479
	if (VALID_CVALUE(uint64, a) && (GET_CVALUE(uint64, a) != 0))
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   480
		SET_OVFLOW(uint64, res);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   481
}
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   482
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   483
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   484
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   485
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   486
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   487
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   488
/* res = a + b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   489
static void CHECK_OVERFLOW_int64_SUM(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   490
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   491
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   492
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   493
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   494
	/* The following test is valid no matter what representation is being used (e.g. two's complement, etc...) */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   495
	if (((b > 0) && (a > (INT64_MAX - b)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   496
	 || ((b < 0) && (a < (INT64_MIN - b))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   497
		SET_OVFLOW(int64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   498
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   499
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   500
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   501
/* res = a - b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   502
static void CHECK_OVERFLOW_int64_SUB(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   503
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   504
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   505
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   506
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   507
	/* The following test is valid no matter what representation is being used (e.g. two's complement, etc...) */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   508
	if (((b > 0) && (a < (INT64_MIN + b)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   509
	 || ((b < 0) && (a > (INT64_MAX + b))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   510
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   511
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   512
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   513
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   514
/* res = a * b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   515
static void CHECK_OVERFLOW_int64_MUL(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   516
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   517
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   518
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   519
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   520
	if (   ( (a > 0) &&  (b > 0) &&             (a > (INT64_MAX / b))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   521
	    || ( (a > 0) && !(b > 0) &&             (b < (INT64_MIN / a))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   522
	    || (!(a > 0) &&  (b > 0) &&             (a < (INT64_MIN / b))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   523
	    || (!(a > 0) && !(b > 0) && (a != 0) && (b < (INT64_MAX / a))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   524
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   525
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   526
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   527
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   528
/* res = a / b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   529
static void CHECK_OVERFLOW_int64_DIV(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   530
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   531
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   532
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   533
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   534
	if ((b == 0) || ((a == INT64_MIN) && (b == -1)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   535
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   536
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   537
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   538
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   539
/* res = a MOD b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   540
static void CHECK_OVERFLOW_int64_MOD(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   541
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   542
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   543
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   544
	int64_t b = GET_CVALUE(int64, b_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   545
	/* IEC 61131-3 standard says IN1 MOD IN2 must be equivalent to
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   546
	 *  IF (IN2 = 0) THEN OUT:=0 ; ELSE OUT:=IN1 - (IN1/IN2)*IN2 ; END_IF
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   547
	 *
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   548
	 * Note that, when IN1 = INT64_MIN, and IN2 = -1, an overflow occurs in the division,
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   549
	 * so although the MOD operation should be OK, acording to the above definition, we actually have an overflow!!
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   550
	 *
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   551
	 * On the other hand, division by 0 is OK!!
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   552
	 */
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   553
	if ((a == INT64_MIN) && (b == -1))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   554
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   555
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   556
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   557
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   558
/* res = - a */
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   559
static void CHECK_OVERFLOW_int64_NEG(symbol_c *res, symbol_c *a) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   560
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   561
		return;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   562
	if (GET_CVALUE(int64, a) == INT64_MIN)
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   563
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   564
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   565
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   566
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   567
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   568
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   569
static void CHECK_OVERFLOW_real64(symbol_c *res_ptr) {
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   570
	if (!VALID_CVALUE(real64, res_ptr))
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   571
		return;
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   572
	real64_t res = GET_CVALUE(real64, res_ptr);
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   573
	/* NaN => underflow, overflow, number is a higher precision format, is a complex number (IEEE standard) */
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   574
	/* The IEC 61131-3 clearly states in section '2.5.1.5.2 Numerical functions':
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   575
	 * "It is an error if the result of evaluation of one of these [numerical] functions exceeds the range of values
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   576
	 *  specified for the data type of the function output, or if division by zero is attempted."
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   577
	 * For this reason, any operation that has as a result a positive or negative inifinity, is also an error!
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   578
	 */
607
be9ba3531afb cleaning up code. Changing HUGE_VAL to INFINITY.
Mario de Sousa <msousa@fe.up.pt>
parents: 604
diff changeset
   579
	if ((isnan(res)) || (res == INFINITY) || (res == -INFINITY))
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   580
		SET_OVFLOW(real64, res_ptr);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   581
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   582
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   583
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   584
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   585
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   586
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   587
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   588
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   589
/***        Functions to execute operations on the const values      ***/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   590
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   591
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   592
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   593
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   594
985
837c6532a9b8 Add comment about bug that needs to be fixed later on.
mjsousa
parents: 984
diff changeset
   595
/* TODO: FIXME !!!!!
837c6532a9b8 Add comment about bug that needs to be fixed later on.
mjsousa
parents: 984
diff changeset
   596
 *   The following operation is wrong - it does not handle the comparisons of all possible datatypes correctly.
837c6532a9b8 Add comment about bug that needs to be fixed later on.
mjsousa
parents: 984
diff changeset
   597
 *   The result of comparig the bool, int64, and uint64 are overwritten by the comparison of the real64 type!
837c6532a9b8 Add comment about bug that needs to be fixed later on.
mjsousa
parents: 984
diff changeset
   598
 */
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   599
/* static void *handle_cmp(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2, OPERATION) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   600
#define handle_cmp(symbol, oper1, oper2, operation) {               \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   601
	if ((NULL == oper1) || (NULL == oper2)) return NULL;        \
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   602
	DO_BINARY_OPER(  bool, operation, bool, oper1, oper2);     \
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   603
	DO_BINARY_OPER(uint64, operation, bool, oper1, oper2);     \
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   604
	DO_BINARY_OPER( int64, operation, bool, oper1, oper2);     \
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   605
	DO_BINARY_OPER(real64, operation, bool, oper1, oper2);     \
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   606
	return NULL;                                                \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   607
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   608
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   609
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   610
/* NOTE: the MOVE standard function is equivalent to the ':=' in ST syntax */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   611
static void *handle_move(symbol_c *to, symbol_c *from) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   612
	if (NULL == from) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   613
	to->const_value = from->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   614
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   615
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   616
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   617
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   618
/* unary negation (multiply by -1) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   619
static void *handle_neg(symbol_c *symbol, symbol_c *oper) {
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   620
	if (NULL == oper) return NULL;
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   621
	/* NOTE: The oper may never be an integer/real literal, '-1' and '-2.2' are stored as an neg_integer_c/neg_real_c instead.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   622
	 *       Because of this, we MUST NOT handle the INT_MIN special situation that is handled in neg_integer_c visitor!
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   623
	 *
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   624
	 *       VAR v1, v2, v3 : UINT; END_VAR;
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   625
	 *       v1 =  9223372036854775808 ; (* |INT64_MIN| == -INT64_MIN *)   <------ LEGAL
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   626
	 *       v2 =  -(-v1);                                                 <------ ILLEGAL (since it -v1 is overflow!)
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   627
	 *       v2 =  -(-9223372036854775808 );                               <------ MUST also be ILLEGAL 
640
ffa02cf2b335 Add some comments.
Mario de Sousa <msousa@fe.up.pt>
parents: 621
diff changeset
   628
	 */
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   629
	DO_UNARY_OPER(uint64, -, oper);	CHECK_OVERFLOW_uint64_NEG(symbol, oper);  /* handle the uint_v := -0 situation! */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   630
	DO_UNARY_OPER( int64, -, oper);	CHECK_OVERFLOW_int64_NEG (symbol, oper);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   631
	DO_UNARY_OPER(real64, -, oper);	CHECK_OVERFLOW_real64(symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   632
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   633
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   634
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   635
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   636
/* unary boolean negation (NOT) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   637
static void *handle_not(symbol_c *symbol, symbol_c *oper) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   638
	if (NULL == oper) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   639
	DO_UNARY_OPER(  bool, !, oper);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   640
	DO_UNARY_OPER(uint64, ~, oper);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   641
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   642
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   643
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   644
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   645
static void *handle_or (symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   646
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   647
	DO_BINARY_OPER(  bool, ||, bool  , oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   648
	DO_BINARY_OPER(uint64, | , uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   649
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   650
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   651
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   652
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   653
static void *handle_xor(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   654
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   655
	DO_BINARY_OPER(  bool, ^, bool  , oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   656
	DO_BINARY_OPER(uint64, ^, uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   657
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   658
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   659
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   660
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   661
static void *handle_and(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   662
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   663
	DO_BINARY_OPER(  bool, &&, bool, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   664
	DO_BINARY_OPER(uint64, & , uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   665
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   666
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   667
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   668
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   669
static void *handle_add(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   670
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   671
	DO_BINARY_OPER(uint64, +, uint64, oper1, oper2);   CHECK_OVERFLOW_uint64_SUM(symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   672
	DO_BINARY_OPER( int64, +,  int64, oper1, oper2);   CHECK_OVERFLOW_int64_SUM (symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   673
	DO_BINARY_OPER(real64, +, real64, oper1, oper2);   CHECK_OVERFLOW_real64    (symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   674
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   675
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   676
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   677
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   678
static void *handle_sub(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   679
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   680
	DO_BINARY_OPER(uint64, -, uint64, oper1, oper2);   CHECK_OVERFLOW_uint64_SUB(symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   681
	DO_BINARY_OPER( int64, -,  int64, oper1, oper2);   CHECK_OVERFLOW_int64_SUB (symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   682
	DO_BINARY_OPER(real64, -, real64, oper1, oper2);   CHECK_OVERFLOW_real64    (symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   683
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   684
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   685
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   686
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   687
static void *handle_mul(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   688
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   689
	DO_BINARY_OPER(uint64, *, uint64, oper1, oper2);   CHECK_OVERFLOW_uint64_MUL(symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   690
	DO_BINARY_OPER( int64, *,  int64, oper1, oper2);   CHECK_OVERFLOW_int64_MUL (symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   691
	DO_BINARY_OPER(real64, *, real64, oper1, oper2);   CHECK_OVERFLOW_real64    (symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   692
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   693
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   694
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   695
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   696
static void *handle_div(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   697
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   698
	if (ISZERO_CVALUE(uint64, oper2))  {SET_OVFLOW(uint64, symbol);} else {DO_BINARY_OPER(uint64, /, uint64, oper1, oper2); CHECK_OVERFLOW_uint64_DIV(symbol, oper1, oper2);};
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   699
	if (ISZERO_CVALUE( int64, oper2))  {SET_OVFLOW( int64, symbol);} else {DO_BINARY_OPER( int64, /,  int64, oper1, oper2); CHECK_OVERFLOW_int64_DIV (symbol, oper1, oper2);};
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   700
	if (ISZERO_CVALUE(real64, oper2))  {SET_OVFLOW(real64, symbol);} else {DO_BINARY_OPER(real64, /, real64, oper1, oper2); CHECK_OVERFLOW_real64(symbol);};
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   701
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   702
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   703
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   704
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   705
static void *handle_mod(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   706
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   707
	/* IEC 61131-3 standard says IN1 MOD IN2 must be equivalent to
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   708
	 *  IF (IN2 = 0) THEN OUT:=0 ; ELSE OUT:=IN1 - (IN1/IN2)*IN2 ; END_IF
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   709
	 *
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   710
	 * Note that, when IN1 = INT64_MIN, and IN2 = -1, an overflow occurs in the division,
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   711
	 * so although the MOD operation should be OK, acording to the above definition, we actually have an overflow!!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   712
	 */
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   713
	if (ISZERO_CVALUE(uint64, oper2))  {SET_CVALUE(uint64, symbol, 0);} else {DO_BINARY_OPER(uint64, %, uint64, oper1, oper2); CHECK_OVERFLOW_uint64_MOD(symbol, oper1, oper2);};
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   714
	if (ISZERO_CVALUE( int64, oper2))  {SET_CVALUE( int64, symbol, 0);} else {DO_BINARY_OPER( int64, %,  int64, oper1, oper2); CHECK_OVERFLOW_int64_MOD (symbol, oper1, oper2);};
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   715
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   716
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   717
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   718
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   719
static void *handle_pow(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   720
	/* NOTE: If the const_value in symbol->r_exp is within the limits of both int64 and uint64, then we do both operations.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   721
	 *       That is OK, as the result should be identicial (we do create an unnecessary CVALUE variable, but who cares?).
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   722
	 *       If only one is valid, then that is the oper we will do!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   723
	 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   724
	if (VALID_CVALUE(real64, oper1) && VALID_CVALUE( int64, oper2))
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   725
		SET_CVALUE(real64, symbol, pow(GET_CVALUE(real64, oper1), GET_CVALUE( int64, oper2)));
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   726
	if (VALID_CVALUE(real64, oper1) && VALID_CVALUE(uint64, oper2))
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   727
		SET_CVALUE(real64, symbol, pow(GET_CVALUE(real64, oper1), GET_CVALUE(uint64, oper2)));
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   728
	CHECK_OVERFLOW_real64(symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   729
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   730
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   731
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   732
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   733
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   734
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   735
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   736
/***        Helper functions for handling IL instruction lists.      ***/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   737
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   738
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   739
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   740
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   741
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   742
/* If the cvalues of all the prev_il_intructions have the same VALID value, then set the local cvalue to that value, otherwise, set it to NONCONST! */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   743
#define intersect_prev_CVALUE_(dtype, symbol) {                                                                   \
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   744
	symbol->const_value._##dtype = symbol->prev_il_instruction[0]->const_value._##dtype;                      \
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   745
	for (unsigned int i = 1; i < symbol->prev_il_instruction.size(); i++) {                                   \
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   746
		if (!ISEQUAL_CVALUE(dtype, symbol, symbol->prev_il_instruction[i]))                               \
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   747
			{SET_NONCONST(dtype, symbol); break;}                                                     \
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   748
	}                                                                                                         \
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   749
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   750
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   751
static void intersect_prev_cvalues(il_instruction_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   752
	if (symbol->prev_il_instruction.empty())
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   753
		return;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   754
	intersect_prev_CVALUE_(real64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   755
	intersect_prev_CVALUE_(uint64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   756
	intersect_prev_CVALUE_( int64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   757
	intersect_prev_CVALUE_(  bool, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   758
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   759
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   760
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   761
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   762
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   763
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   764
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   765
/***        The constant_folding_c                                   ***/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   766
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   767
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   768
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   769
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   770
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   771
constant_folding_c::constant_folding_c(symbol_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   772
    error_count = 0;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   773
    warning_found = false;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   774
    current_display_error_level = 0;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   775
    il_operand = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   776
    prev_il_instruction = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   777
    
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   778
    /* check whether the platform on which the compiler is being run implements IEC 559 floating point data types. */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   779
    symbol_c null_symbol;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   780
    if (! (std::numeric_limits<real64_t>::is_iec559) )
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   781
        STAGE3_WARNING(&null_symbol, &null_symbol, "The platform running the compiler does not implement IEC 60559 floating point numbers. "
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   782
                                                   "Any error and/or warning messages related to overflow/underflow of the result of operations on REAL/LREAL literals "
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   783
                                                   "(i.e. constant folding) may themselves be erroneous, although are most probably correct."
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   784
                                                   "However, more likely is the possible existance of overflow/underflow errors that are not detected.");
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   785
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   786
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   787
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   788
constant_folding_c::~constant_folding_c(void) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   789
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   790
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   791
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   792
int constant_folding_c::get_error_count() {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   793
	return error_count;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   794
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   795
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   796
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   797
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   798
/*********************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   799
/* B 1.2 - Constants */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   800
/*********************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   801
/******************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   802
/* B 1.2.1 - Numeric Literals */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   803
/******************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   804
void *constant_folding_c::visit(real_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   805
	bool overflow;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   806
	SET_CVALUE(real64, symbol, extract_real_value(symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   807
	if (overflow) SET_OVFLOW(real64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   808
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   809
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   810
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   811
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   812
void *constant_folding_c::visit(integer_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   813
	bool overflow;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   814
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   815
	if (overflow) SET_OVFLOW(int64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   816
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   817
	if (overflow) SET_OVFLOW(uint64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   818
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   819
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   820
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   821
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   822
void *constant_folding_c::visit(neg_real_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   823
	symbol->exp->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   824
	DO_UNARY_OPER(real64, -, symbol->exp); CHECK_OVERFLOW_real64(symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   825
	if (IS_OVFLOW(real64, symbol->exp)) SET_OVFLOW(real64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   826
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   827
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   828
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   829
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   830
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   831
/* | '-' integer	{$$ = new neg_integer_c($2, locloc(@$));} */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   832
void *constant_folding_c::visit(neg_integer_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   833
	symbol->exp->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   834
	/* Note that due to syntax restrictions, the value of symbol->exp will always be positive. 
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   835
	 * However, the following code does not depend on that restriction.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   836
	 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   837
	/* The remainder of the code (for example, data type checking) considers the neg_integer_c as a leaf of the
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   838
	 * abstract syntax tree, and therefore simply ignores the values of neg_integer_c->exp.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   839
	 * For this reason only, and in only this situation, we must guarantee that any 'overflow' situation in 
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   840
	 * the cvalue of neg_integer_c->exp is also reflected back to this neg_integer_c symbol.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   841
	 * For the rest of the code we do NOT do this, as it would gurantee that a single overflow deep inside
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   842
	 * an expression would imply that the expression itself would also be set to 'overflow' condition.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   843
	 * This in turn would then have the compiler produce a whole load of error messages where they are not wanted!
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   844
	 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   845
	DO_UNARY_OPER(uint64, -, symbol->exp); CHECK_OVERFLOW_uint64_NEG(symbol, symbol->exp);  /* handle the uintv := -0 situation */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   846
	if (IS_OVFLOW(uint64, symbol->exp)) SET_OVFLOW(uint64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   847
	DO_UNARY_OPER( int64, -, symbol->exp); CHECK_OVERFLOW_int64_NEG (symbol, symbol->exp);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   848
	if (IS_OVFLOW( int64, symbol->exp)) SET_OVFLOW( int64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   849
	/* NOTE 1: INT64_MIN = -(INT64_MAX + 1)   ---> assuming two's complement representation!!!
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   850
	 * NOTE 2: if the user happens to want INT_MIN, that value will first be parsed as a positive integer, before being negated here.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   851
	 * However, the positive value cannot be stored inside an int64! So, in this case, we will get the value from the uint64 cvalue.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   852
	 *
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   853
	 * This same situation is usually considered an overflow (check handle_neg() function). However, here we have a special
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   854
	 * situation. If we do not allow this, then the user would never the able to use the following code:
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   855
	 *  VAR v : LINT; END_VAR
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   856
	 *    v := -9223372036854775809 ; (* - |INT64_MIN| == INT64_MIN *)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   857
	 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   858
	// if (INT64_MIN == -INT64_MAX - 1) // We do not really need to check that the platform uses two's complement
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   859
	if (VALID_CVALUE(uint64, symbol->exp) && (GET_CVALUE(uint64, symbol->exp) == (uint64_t)INT64_MAX+1)) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   860
		SET_CVALUE(int64, symbol, INT64_MIN);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   861
	}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   862
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   863
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   864
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   865
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   866
void *constant_folding_c::visit(binary_integer_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   867
	bool overflow;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   868
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   869
	if (overflow) SET_OVFLOW(int64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   870
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   871
	if (overflow) SET_OVFLOW(uint64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   872
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   873
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   874
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   875
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   876
void *constant_folding_c::visit(octal_integer_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   877
	bool overflow;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   878
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   879
	if (overflow) SET_OVFLOW(int64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   880
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   881
	if (overflow) SET_OVFLOW(uint64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   882
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   883
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   884
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   885
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   886
void *constant_folding_c::visit(hex_integer_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   887
	bool overflow;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   888
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   889
	if (overflow) SET_OVFLOW(int64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   890
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   891
	if (overflow) SET_OVFLOW(uint64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   892
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   893
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   894
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   895
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   896
/*
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   897
integer_literal:
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   898
  integer_type_name '#' signed_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   899
| integer_type_name '#' binary_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   900
| integer_type_name '#' octal_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   901
| integer_type_name '#' hex_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   902
*/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   903
// SYM_REF2(integer_literal_c, type, value)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   904
void *constant_folding_c::visit(integer_literal_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   905
	symbol->value->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   906
	DO_UNARY_OPER( int64, /* none */, symbol->value);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   907
	DO_UNARY_OPER(uint64, /* none */, symbol->value);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   908
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   909
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   910
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   911
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   912
void *constant_folding_c::visit(real_literal_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   913
	symbol->value->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   914
	DO_UNARY_OPER(real64, /* none */, symbol->value);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   915
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   916
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   917
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   918
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   919
void *constant_folding_c::visit(bit_string_literal_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   920
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   921
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   922
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   923
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   924
void *constant_folding_c::visit(boolean_literal_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   925
	symbol->value->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   926
	DO_UNARY_OPER(bool, /* none */, symbol->value);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   927
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   928
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   929
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   930
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   931
void *constant_folding_c::visit(boolean_true_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   932
	SET_CVALUE(bool, symbol, true);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   933
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   934
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   935
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   936
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   937
void *constant_folding_c::visit(boolean_false_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   938
	SET_CVALUE(bool, symbol, false);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   939
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   940
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   941
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   942
/************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   943
/* B 1.2.3.1 - Duration */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   944
/********* **************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   945
void *constant_folding_c::visit(fixed_point_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   946
	bool overflow;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   947
	SET_CVALUE(real64, symbol, extract_real_value(symbol, &overflow));
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   948
	if (overflow) SET_OVFLOW(real64, symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   949
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   950
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   951
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   952
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   953
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   954
/****************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   955
/* B.2 - Language IL (Instruction List) */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   956
/****************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   957
/***********************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   958
/* B 2.1 Instructions and Operands */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   959
/***********************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   960
/* Not needed, since we inherit from iterator_visitor_c */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   961
/*| instruction_list il_instruction */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   962
// SYM_LIST(instruction_list_c)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   963
// void *constant_folding_c::visit(instruction_list_c *symbol) {}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   964
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   965
/* | label ':' [il_incomplete_instruction] eol_list */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   966
// SYM_REF2(il_instruction_c, label, il_instruction)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   967
// void *visit(instruction_list_c *symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   968
void *constant_folding_c::visit(il_instruction_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   969
	if (NULL == symbol->il_instruction) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   970
		/* This empty/null il_instruction does not change the value of the current/default IL variable.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   971
		 * So it inherits the candidate_datatypes from it's previous IL instructions!
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   972
		 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   973
		intersect_prev_cvalues(symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   974
	} else {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   975
		il_instruction_c fake_prev_il_instruction = *symbol;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   976
		intersect_prev_cvalues(&fake_prev_il_instruction);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   977
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   978
		if (symbol->prev_il_instruction.size() == 0)  prev_il_instruction = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   979
		else                                          prev_il_instruction = &fake_prev_il_instruction;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   980
		symbol->il_instruction->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   981
		prev_il_instruction = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   982
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   983
		/* This object has (inherits) the same cvalues as the il_instruction */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   984
		symbol->const_value = symbol->il_instruction->const_value;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   985
	}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   986
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   987
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   988
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   989
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   990
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   991
void *constant_folding_c::visit(il_simple_operation_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   992
	/* determine the cvalue of the operand */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   993
	if (NULL != symbol->il_operand) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   994
		symbol->il_operand->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   995
	}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   996
	/* determine the cvalue resulting from executing the il_operator... */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   997
	il_operand = symbol->il_operand;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   998
	symbol->il_simple_operator->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
   999
	il_operand = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1000
	/* This object has (inherits) the same cvalues as the il_instruction */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1001
	symbol->const_value = symbol->il_simple_operator->const_value;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1002
	return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1003
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1004
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1005
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1006
/* TODO: handle function invocations... */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1007
/* | function_name [il_operand_list] */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1008
/* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1009
// SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1010
// void *constant_folding_c::visit(il_function_call_c *symbol) {}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1011
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1012
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1013
/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1014
// SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1015
void *constant_folding_c::visit(il_expression_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1016
  symbol_c *prev_il_instruction_backup = prev_il_instruction;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1017
  
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1018
  /* Stage2 will insert an artificial (and equivalent) LD <il_operand> to the simple_instr_list if necessary. We can therefore ignore the 'il_operand' entry! */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1019
  // if (NULL != symbol->il_operand)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1020
  //   symbol->il_operand->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1021
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1022
  if(symbol->simple_instr_list != NULL)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1023
    symbol->simple_instr_list->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1024
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1025
  /* Now do the operation,  */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1026
  il_operand = symbol->simple_instr_list;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1027
  prev_il_instruction = prev_il_instruction_backup;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1028
  symbol->il_expr_operator->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1029
  il_operand = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1030
  
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1031
  /* This object has (inherits) the same cvalues as the il_instruction */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1032
  symbol->const_value = symbol->il_expr_operator->const_value;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1033
  
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1034
  /* Since stage2 will insert an artificial (and equivalent) LD <il_operand> to the simple_instr_list when an 'il_operand' exists, we know
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1035
   * that if (symbol->il_operand != NULL), then the first IL instruction in the simple_instr_list will be the equivalent and artificial
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1036
   * 'LD <il_operand>' IL instruction.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1037
   * Just to be cosistent, we will copy the constant info back into the il_operand, even though this should not be necessary!
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1038
   */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1039
  if ((NULL != symbol->il_operand) && ((NULL == symbol->simple_instr_list) || (0 == ((list_c *)symbol->simple_instr_list)->n))) ERROR; // stage2 is not behaving as we expect it to!
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1040
  if  (NULL != symbol->il_operand)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1041
    symbol->il_operand->const_value = ((list_c *)symbol->simple_instr_list)->elements[0]->const_value;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1042
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1043
  return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1044
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1045
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1046
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1047
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1048
void *constant_folding_c::visit(il_jump_operation_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1049
  /* recursive call to fill const values... */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1050
  il_operand = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1051
  symbol->il_jump_operator->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1052
  il_operand = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1053
  /* This object has (inherits) the same cvalues as the il_jump_operator */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1054
  symbol->const_value = symbol->il_jump_operator->const_value;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1055
  return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1056
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1057
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1058
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1059
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1060
/* FB calls leave the value in the accumulator unchanged */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1061
/*   il_call_operator prev_declared_fb_name
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1062
 * | il_call_operator prev_declared_fb_name '(' ')'
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1063
 * | il_call_operator prev_declared_fb_name '(' eol_list ')'
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1064
 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1065
 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1066
 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1067
/* NOTE: The parameter 'called_fb_declaration'is used to pass data between stage 3 and stage4 (although currently it is not used in stage 4 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1068
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1069
void *constant_folding_c::visit(il_fb_call_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1070
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1071
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1072
/* TODO: handle function invocations... */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1073
/* | function_name '(' eol_list [il_param_list] ')' */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1074
/* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1075
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1076
// void *constant_folding_c::visit(il_formal_funct_call_c *symbol) {return NULL;}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1077
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1078
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1079
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1080
/* Not needed, since we inherit from iterator_visitor_c */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1081
//  void *constant_folding_c::visit(il_operand_list_c *symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1082
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1083
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1084
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1085
/* | simple_instr_list il_simple_instruction */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1086
/* This object is referenced by il_expression_c objects */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1087
void *constant_folding_c::visit(simple_instr_list_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1088
  if (symbol->n <= 0)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1089
    return NULL;  /* List is empty! Nothing to do. */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1090
    
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1091
  for(int i = 0; i < symbol->n; i++)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1092
    symbol->elements[i]->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1093
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1094
  /* This object has (inherits) the same cvalues as the il_jump_operator */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1095
  symbol->const_value = symbol->elements[symbol->n-1]->const_value;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1096
  return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1097
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1098
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1099
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1100
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1101
// SYM_REF1(il_simple_instruction_c, il_simple_instruction, symbol_c *prev_il_instruction;)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1102
void *constant_folding_c::visit(il_simple_instruction_c *symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1103
  if (symbol->prev_il_instruction.size() > 1) ERROR; /* There should be no labeled insructions inside an IL expression! */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1104
  if (symbol->prev_il_instruction.size() == 0)  prev_il_instruction = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1105
  else                                          prev_il_instruction = symbol->prev_il_instruction[0];
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1106
  symbol->il_simple_instruction->accept(*this);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1107
  prev_il_instruction = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1108
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1109
  /* This object has (inherits) the same cvalues as the il_jump_operator */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1110
  symbol->const_value = symbol->il_simple_instruction->const_value;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1111
  return NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1112
}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1113
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1114
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1115
/*
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1116
    void *visit(il_param_list_c *symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1117
    void *visit(il_param_assignment_c *symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1118
    void *visit(il_param_out_assignment_c *symbol);
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1119
*/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1120
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1121
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1122
/*******************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1123
/* B 2.2 Operators */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1124
/*******************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1125
void *constant_folding_c::visit(   LD_operator_c *symbol) {return handle_move(symbol, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1126
void *constant_folding_c::visit(  LDN_operator_c *symbol) {return handle_not (symbol, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1127
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1128
/* NOTE: we are implementing a constant folding algorithm, not a constant propagation algorithm.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1129
 *       For the constant propagation algorithm, the correct implementation of ST(N)_operator_c would be...
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1130
 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1131
//void *constant_folding_c::visit(   ST_operator_c *symbol) {return handle_move(il_operand, symbol);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1132
//void *constant_folding_c::visit(  STN_operator_c *symbol) {return handle_not (il_operand, symbol);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1133
void *constant_folding_c::visit(   ST_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1134
void *constant_folding_c::visit(  STN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1135
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1136
/* NOTE: the standard allows syntax in which the NOT operator is followed by an optional <il_operand>
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1137
 *              NOT [<il_operand>]
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1138
 *       However, it does not define the semantic of the NOT operation when the <il_operand> is specified.
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1139
 *       We therefore consider it an error if an il_operand is specified! This error will be caught elsewhere!
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1140
 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1141
void *constant_folding_c::visit(  NOT_operator_c *symbol) {return handle_not(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1142
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1143
/* NOTE: Since we are only implementing a constant folding algorithm, and not a constant propagation algorithm,
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1144
 *       the following IL instructions do not change/set the value of the il_operand!
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1145
 */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1146
void *constant_folding_c::visit(    S_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1147
void *constant_folding_c::visit(    R_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1148
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1149
/* FB calls leave the value in the accumulator unchanged */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1150
void *constant_folding_c::visit(   S1_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1151
void *constant_folding_c::visit(   R1_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1152
void *constant_folding_c::visit(  CLK_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1153
void *constant_folding_c::visit(   CU_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1154
void *constant_folding_c::visit(   CD_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1155
void *constant_folding_c::visit(   PV_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1156
void *constant_folding_c::visit(   IN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1157
void *constant_folding_c::visit(   PT_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1158
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1159
void *constant_folding_c::visit(  AND_operator_c *symbol) {return handle_and (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1160
void *constant_folding_c::visit(   OR_operator_c *symbol) {return handle_or  (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1161
void *constant_folding_c::visit(  XOR_operator_c *symbol) {return handle_xor (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1162
void *constant_folding_c::visit( ANDN_operator_c *symbol) {       handle_and (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1163
void *constant_folding_c::visit(  ORN_operator_c *symbol) {       handle_or  (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1164
void *constant_folding_c::visit( XORN_operator_c *symbol) {       handle_xor (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1165
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1166
void *constant_folding_c::visit(  ADD_operator_c *symbol) {return handle_add (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1167
void *constant_folding_c::visit(  SUB_operator_c *symbol) {return handle_sub (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1168
void *constant_folding_c::visit(  MUL_operator_c *symbol) {return handle_mul (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1169
void *constant_folding_c::visit(  DIV_operator_c *symbol) {return handle_div (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1170
void *constant_folding_c::visit(  MOD_operator_c *symbol) {return handle_mod (symbol, prev_il_instruction, il_operand);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1171
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1172
void *constant_folding_c::visit(   GT_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, > );}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1173
void *constant_folding_c::visit(   GE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, >=);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1174
void *constant_folding_c::visit(   EQ_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, ==);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1175
void *constant_folding_c::visit(   LT_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, < );}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1176
void *constant_folding_c::visit(   LE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, <=);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1177
void *constant_folding_c::visit(   NE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, !=);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1178
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1179
void *constant_folding_c::visit(  CAL_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1180
void *constant_folding_c::visit(  RET_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1181
void *constant_folding_c::visit(  JMP_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1182
void *constant_folding_c::visit( CALC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1183
void *constant_folding_c::visit(CALCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1184
void *constant_folding_c::visit( RETC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1185
void *constant_folding_c::visit(RETCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1186
void *constant_folding_c::visit( JMPC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1187
void *constant_folding_c::visit(JMPCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1188
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1189
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1190
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1191
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1192
/***************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1193
/* B.3 - Language ST (Structured Text) */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1194
/***************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1195
/***********************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1196
/* B 3.1 - Expressions */
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1197
/***********************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1198
void *constant_folding_c::visit(    or_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_or (symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1199
void *constant_folding_c::visit(   xor_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_xor(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1200
void *constant_folding_c::visit(   and_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_and(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1201
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1202
void *constant_folding_c::visit(   equ_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, ==);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1203
void *constant_folding_c::visit(notequ_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, !=);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1204
void *constant_folding_c::visit(    lt_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, < );}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1205
void *constant_folding_c::visit(    gt_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, > );}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1206
void *constant_folding_c::visit(    le_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, <=);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1207
void *constant_folding_c::visit(    ge_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, >=);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1208
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1209
void *constant_folding_c::visit(   add_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_add(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1210
void *constant_folding_c::visit(   sub_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_sub(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1211
void *constant_folding_c::visit(   mul_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_mul(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1212
void *constant_folding_c::visit(   div_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_div(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1213
void *constant_folding_c::visit(   mod_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_mod(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1214
void *constant_folding_c::visit( power_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_pow(symbol, symbol->l_exp, symbol->r_exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1215
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1216
void *constant_folding_c::visit(   neg_expression_c *symbol) {symbol->  exp->accept(*this); return handle_neg(symbol, symbol->exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1217
void *constant_folding_c::visit(   not_expression_c *symbol) {symbol->  exp->accept(*this); return handle_not(symbol, symbol->exp);}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1218
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1219
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1220
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1221
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1222
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1223
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1224
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1225
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1226
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1227
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1228
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1229
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1230
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1231
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1232
/***        The constant_propagation_c                               ***/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1233
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1234
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1235
/***********************************************************************/
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1236
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1237
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1238
constant_propagation_c::constant_propagation_c(symbol_c *symbol)
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1239
  : constant_folding_c(symbol) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1240
    current_resource = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1241
    current_configuration = NULL;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1242
    fixed_init_value_ = false;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1243
    function_pou_ = false;
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1244
    values = NULL;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1245
  }
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1246
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1247
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1248
constant_propagation_c::~constant_propagation_c(void) {}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1249
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1250
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1251
static constant_propagation_c::map_values_t inner_left_join_values(constant_propagation_c::map_values_t m1, constant_propagation_c::map_values_t m2) {
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1252
	constant_propagation_c::map_values_t::const_iterator itr;
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1253
	constant_propagation_c::map_values_t ret;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1254
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1255
	itr = m1.begin();
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1256
	for ( ; itr != m1.end(); ++itr) {
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1257
		std::string name = itr->first;
965
c9eeb67ba939 Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)
mjsousa
parents: 964
diff changeset
  1258
		const_value_c value;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1259
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1260
		if (m2.count(name) > 0) {
965
c9eeb67ba939 Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)
mjsousa
parents: 964
diff changeset
  1261
			const_value_c c1 = itr->second;
c9eeb67ba939 Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)
mjsousa
parents: 964
diff changeset
  1262
			const_value_c c2 = m2[name];
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1263
			COMPUTE_MEET_SEMILATTICE (real64, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1264
			COMPUTE_MEET_SEMILATTICE (uint64, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1265
			COMPUTE_MEET_SEMILATTICE ( int64, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1266
			COMPUTE_MEET_SEMILATTICE (  bool, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1267
		} else
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1268
			value = m1[name];
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1269
		ret[name] = value;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1270
	}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1271
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1272
	return ret;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1273
}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1274
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1275
/***************************/
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1276
/* B 0 - Programming Model */
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1277
/***************************/
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1278
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1279
// SYM_LIST(library_c, enumvalue_symtable_t enumvalue_symtable;)
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1280
  /* The constant propagation algorithm propagates the constant values to all the locations
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1281
   * in the code where expressions can be determined to have a fixed value.
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1282
   *  e.g.:   var1 := 99;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1283
   *          var2[var1] := 42; <-- with constant propagation, we know we are accessing var2[99] here!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1284
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1285
   * An important question in constant propagation is whether we should use the values of 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1286
   * VAR_GLOBAL CONSTANT variables as a constant. The problem here is that the 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1287
   * constant value of each global variable can only be declared in a configuration,
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1288
   * but a POU may eventually be used from different configurations.
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1289
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1290
   * For example:
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1291
   *     CONFIGURATION conf1
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1292
   *       VAR_GLOBAL CONSTANT global_const : INT := 42; END_VAR
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1293
   *       PROGRAM prog1 WITH TaskX : Prog1_t;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1294
   *     END_CONFIGURATION
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1295
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1296
   *     CONFIGURATION conf2
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1297
   *       VAR_GLOBAL CONSTANT global_const : INT := 18; END_VAR
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1298
   *       PROGRAM prog1 WITH TaskX : Prog1_t;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1299
   *     END_CONFIGURATION
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1300
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1301
   *     PROGRAM Prog1_t
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1302
   *      VAR_EXTERN COSNTANT  global_const : INT; END_VAR  <--- NOTE: 61131-3 syntax does not allow const value to be set here!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1303
   *      VAR .... END_VAR
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1304
   *       array_var[global_const] := 0;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1305
   *     END_PROGRAM
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1306
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1307
   *  Considering the above code, where Prog1_t is instanciated in both conf1 and conf2,
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1308
   *  and therefore where the 'constant' var_global may actually take two possible values
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1309
   *  (42 and 18), it would be incorrect to consider the var_global variable a constant in
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1310
   *  the constant propagation algorithm.
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1311
   *  This means that when doing constant propagation of the Prog1_t POU, we should consider
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1312
   *  all global variables (including the 'constant') as non-constant - this actually makes
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1313
   *  the algorithm much easier!).
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1314
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1315
   *  However, matiec has implemented an extension where we allow arrays whose size may be 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1316
   *  defined using symbolic variables, whose value can be determined at compile time 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1317
   *  (typically VAR CONSTANT variables). To really become usefull, this extension must allow
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1318
   *  the same var_global constant to be used in declaring arrays in both configuration as
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1319
   *  well as in some other POUs.
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1320
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1321
   *   e.g.:
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1322
   *     CONFIGURATION conf2
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1323
   *       VAR_GLOBAL CONSTANT global_const : INT := 18; END_VAR
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1324
   *       VAR_GLOBAL          global_array : ARRAY [1..global_const] OF INT; END_VAR
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1325
   *       PROGRAM prog1 WITH TaskX : Prog1_t;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1326
   *     END_CONFIGURATION
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1327
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1328
   *     PROGRAM Prog1_t
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1329
   *      VAR_EXTERN COSNTANT  global_const : INT; END_VAR  <--- NOTE: 61131-3 syntax does not allow const value to be set here!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1330
   *      VAR_EXTERN           global_array : ARRAY [1..global_const] OF INT; END_VAR
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1331
   *      VAR .... END_VAR
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1332
   *       global_array[global_const] := 0;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1333
   *     END_PROGRAM
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1334
   * 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1335
   * The above requirement means that we MUST therefore do the propagation of constant values
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1336
   * from a var_global constant to the corresponding var_external in the POUs. 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1337
   * This implies 3 things:
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1338
   *   1) We must detect when two configurations use the same POU and set distinct values
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1339
   *       to the same var_global - we emit a warning/error (which should we emit?)
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1340
   *   2) Even if each POU is used by only one configuration, we must warn the user that
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1341
   *       the generated code may not be safely turned into a library to be later linked
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1342
   *       to other configurations
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1343
   *   3) To do the propagation of the var_global const value to the var_external,
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1344
   *       we must first analyse all the configurations in the library. 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1345
   *       - When analysing a configuration, we store all the constant values in the 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1346
   *         global_values[] map, and call from within the configuration context all the POUs
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1347
   *         instantiated inside this configuration (basically, we do the constant propagation 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1348
   *         of each POU with the global_values[] map preloaded with all the constant values).
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1349
   *         This means that we may evetually do constant folding of the same POU type multiple
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1350
   *         times (if it is instantiated multiple times in the same configuration, or once
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1351
   *         in several configurations). This should not be a problem because the constant
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1352
   *         propagation algorithm is idem-potent (assuming the same constant values in the 
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1353
   *         beginning), and we can use these multiple calls to the same POU to detect if
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1354
   *         the situation mentioned in (1) is ocurring.
989
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1355
   *         Note too that FBs may also include VAR_EXTERN CONSTANT variables, which must also
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1356
   *         get their constant value from the corresponding global variable (declared in the 
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1357
   *         configuration, program and FBs currently in scope). For this reason, when a FB
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1358
   *         variable is instantiated inside a configuration, program or FB, we must recursively
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1359
   *         visit the FB type declaration!
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1360
   *       - After analysing all the configurations, we analyse all the other POUs that have
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1361
   *         not yet been called (because they are not instantiated directly from within
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1362
   *         any configuration - e.g. functions, and most FBs!).
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1363
   *       It is for this reason (3) why we have the two loops on the following code!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1364
   */
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1365
void *constant_propagation_c::visit(library_c *symbol) {
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1366
  int i;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1367
  
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1368
  for (i = 0; i < symbol->n; i++) {
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1369
    // first analyse the configurations
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1370
    if (NULL != dynamic_cast<configuration_declaration_c *>(symbol->elements[i]))
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1371
      symbol->elements[i]->accept(*this);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1372
  }
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1373
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1374
  for (i = 0; i < symbol->n; i++) {
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1375
    /* NOTE: we will be re-visiting all the POUs that were already called indirectly through the
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1376
     *       visit(program_configuration_c) of vist(fb_task_c) visitors during the previous for
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1377
     *       loop. However, this is OK as the only difference would be how the VAR_EXTERN are handled,
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1378
     *       and that is taken care of in the visit(external_declaration_c) visitor!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1379
     */
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1380
    if (NULL == dynamic_cast<configuration_declaration_c *>(symbol->elements[i]))
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1381
      symbol->elements[i]->accept(*this);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1382
  }
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1383
  
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1384
  return NULL;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1385
}
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1386
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1387
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1388
/*********************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1389
/* B 1.4 - Variables */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1390
/*********************/
981
aad6aa35ce60 Disable constant propagation again (still not working correctly)
mjsousa
parents: 974
diff changeset
  1391
#if DO_CONSTANT_PROPAGATION__
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1392
void *constant_propagation_c::visit(symbolic_variable_c *symbol) {
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1393
	std::string varName = get_var_name_c::get_name(symbol->var_name)->value;
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1394
	if (values->count(varName) > 0) 
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1395
		symbol->const_value = (*values)[varName];
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1396
	return NULL;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1397
}
981
aad6aa35ce60 Disable constant propagation again (still not working correctly)
mjsousa
parents: 974
diff changeset
  1398
#endif  // DO_CONSTANT_PROPAGATION__
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1399
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1400
void *constant_propagation_c::visit(symbolic_constant_c *symbol) {
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1401
	std::string varName = get_var_name_c::get_name(symbol->var_name)->value;
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1402
	if (values->count(varName) > 0) 
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1403
		symbol->const_value = (*values)[varName];
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1404
	return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1405
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1406
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1407
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1408
/******************************************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1409
/* B 1.4.3 - Declaration & Initialisation */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1410
/******************************************/
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1411
  
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1412
void *constant_propagation_c::handle_var_decl(symbol_c *var_list, bool fixed_init_value) {
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1413
  fixed_init_value_ = fixed_init_value;
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1414
  var_list->accept(*this); 
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1415
  fixed_init_value_ = false; 
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1416
  return NULL;
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1417
}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1418
990
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1419
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1420
#include <algorithm>    // std::find
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1421
void *constant_propagation_c::handle_var_list_decl(symbol_c *var_list, symbol_c *type_decl, bool is_global_var) {
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1422
  type_decl->accept(*this);  // Do constant folding of the initial value, and literals in subranges! (we will probably be doing this multiple times for the same init value, but this is safe as the cvalue is idem-potent)
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1423
  symbol_c *init_value = type_initial_value_c::get(type_decl);  
989
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1424
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1425
  /* There are two main possibilities here: either we are instantiating FBs, or some other variable.
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1426
   *   (1) if it is a FB, we must recursively visit the FB type declaration, to let any VAR_EXTERN
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1427
   *       variables there get their initial value from the current var_global_values[] map!!
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1428
   *   (2) if it is a normal variable, we will store the initial value of that variable in the values[] map.
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1429
   *        (and also store it in the var_global_values[] map is it is a VAR_GLOBAL variable!)
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1430
   */
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1431
   
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1432
  /* Check whether we have situation (1) mentioned above! */ 
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1433
  /* find the possible declaration (i.e. the datatype) of the possible FB being instantiated */
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1434
  // NOTE: we do not use symbol->datatype so this const propagation algorithm will not depend on the fill/narrow datatypes algorithm!
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1435
  function_block_type_symtable_t::iterator itr = function_block_type_symtable.end(); // assume not a FB!
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1436
  symbol_c *type_symbol = spec_init_sperator_c::get_spec(type_decl);
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1437
  token_c  *type_name  = dynamic_cast<token_c *>(type_symbol);
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1438
  if (type_name != NULL)
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1439
    itr = function_block_type_symtable.find(type_name);
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1440
  if (itr != function_block_type_symtable.end()) {
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1441
    // Handle the situation (1) mentioned above, i.e. handle the instantiation of FBs. 
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1442
    // -------------------------------------------------------------------------------
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1443
    //  Remmeber that in this case we will recursively visit the FB type declaration!!
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1444
    function_block_declaration_c *fb_type = itr->second;
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1445
    if (NULL == fb_type) ERROR; // syntax parsing should not allow this!
990
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1446
    // WARNING: Before calling fb_type->accept(*this), we must first determine whether we are already currently visiting this exact 
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1447
    //          same FB declaration (possible with -p option), so we do not get into an infinite loop!!
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1448
    // NOTE: We use the std::find() standard algorithm, since the std::stack and std::deque do not have the find() member function.
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1449
    //       We could alternatively use a std::set instead of std::deque, but then it would not be evident that insertion and deletion
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1450
    //       of fb_types follows a push() and pop() algorithm typical of stacks.
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1451
    if (std::find(fbs_currently_being_visited.begin(), fbs_currently_being_visited.end(), fb_type) == fbs_currently_being_visited.end()) {
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1452
      // The fb_type is not in the fbs_currently_being_visited stack, so we push it onto the stack, and then visit it!!
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1453
      fbs_currently_being_visited.push_back(fb_type);
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1454
      fb_type->accept(*this);
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1455
      fbs_currently_being_visited.pop_back();
4c235d65afdd Do not allow constant_propagation algorithm go into infinite loop when analysing code with circular references.
mjsousa
parents: 989
diff changeset
  1456
    }
989
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1457
    return NULL;
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1458
  }
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1459
  
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1460
  // Handle the situation (2) mentioned above, i.e. handle the instantiation of non-FB variables. 
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1461
  // --------------------------------------------------------------------------------------------
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1462
  if (NULL == init_value)   {return NULL;} // this is some datatype for which no initial value exists! Do nothing and return.
968
649e03abbfc1 Do constant folding of default initial values of datatypes.
mjsousa
parents: 967
diff changeset
  1463
  init_value->accept(*this); // necessary when handling default initial values, that were not constant folded in the call type_decl->accept(*this)
649e03abbfc1 Do constant folding of default initial values of datatypes.
mjsousa
parents: 967
diff changeset
  1464
  
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1465
  list_c *list = dynamic_cast<list_c *>(var_list);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1466
  if (NULL == list) ERROR;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1467
  for (int i = 0; i < list->n; i++) {
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1468
    token_c *var_name = dynamic_cast<token_c *>(list->elements[i]);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1469
    if (NULL == var_name) {
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1470
      if (NULL != dynamic_cast<extensible_input_parameter_c *>(list->elements[i]))
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1471
        continue; // this is an extensible standard function. Ignore this variable, and continue!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1472
      // debug_c::print(list->elements[i]);
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1473
      ERROR;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1474
    }
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1475
    list->elements[i]->const_value = init_value->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1476
    if (fixed_init_value_) {
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1477
      (*values)[var_name->value] = init_value->const_value;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1478
      if (is_global_var)
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1479
        // also store it in the var_global_values map!!
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1480
        // Notice that global variables are also placed in the values map!!
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1481
        var_global_values[var_name->value] = init_value->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1482
    }
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1483
  }
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1484
  return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1485
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1486
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1487
//SYM_REF0(constant_option_c)     // Not needed!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1488
//SYM_REF0(retain_option_c)       // Not needed!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1489
//SYM_REF0(non_retain_option_c)   // Not needed!
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1490
bool constant_propagation_c::is_constant(symbol_c *option) {return (NULL != dynamic_cast<constant_option_c *>(option));}
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1491
bool constant_propagation_c::is_retain  (symbol_c *option) {return (NULL != dynamic_cast<  retain_option_c *>(option));}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1492
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1493
/* | var1_list ',' variable_name */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1494
//SYM_LIST(var1_list_c)           // Not needed!
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1495
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1496
/* spec_init is one of the following...
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1497
 *    simple_spec_init_c *
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1498
 *    subrange_spec_init_c *
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1499
 *    enumerated_spec_init_c *
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1500
 */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1501
// SYM_REF2(var1_init_decl_c, var1_list, spec_init)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1502
void *constant_propagation_c::visit(var1_init_decl_c *symbol) {return handle_var_list_decl(symbol->var1_list, symbol->spec_init);}
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1503
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1504
/* | [var1_list ','] variable_name integer '..' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1505
/* NOTE: This is an extension to the standard!!! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1506
//SYM_REF2(extensible_input_parameter_c, var_name, first_index)          // Not needed!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1507
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1508
/* var1_list ':' array_spec_init */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1509
//SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)            // We do not yet handle arrays!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1510
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1511
/*  var1_list ':' initialized_structure */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1512
//SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure) // We do not yet handle structures!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1513
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1514
/* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1515
//SYM_REF2(fb_name_decl_c, fb_name_list, fb_spec_init)
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1516
void *constant_propagation_c::visit(fb_name_decl_c *symbol) {
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1517
  /* A FB has been instantiated inside the POU currently being analysed. We must therefore visit this FB's type declaration
989
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1518
   *  and give the VAR_EXTERNs in that FB a chance to get the const values from the global variables currently in scope!
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1519
   */
989
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1520
  // NOTE: The generic handle_var_list_decl() can handle the above situation, so we simply call it!
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1521
  // NOTE: The handle_var_list_decl() should not be needing the fb_name_list to do the above, so we call
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1522
  //         it with NULL to highlight this fact!
d4f8931d80cd Do constant propagation of FBs instantiated in other FB or Programs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 988
diff changeset
  1523
  return handle_var_list_decl(NULL, symbol->fb_spec_init);
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1524
}
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1525
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1526
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1527
/* fb_name_list ',' fb_name */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1528
//SYM_LIST(fb_name_list_c)                                               // Not needed!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1529
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1530
/* VAR_INPUT [option] input_declaration_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1531
/* option -> the RETAIN/NON_RETAIN/<NULL> directive... */
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1532
//SYM_REF3(input_declarations_c, option, input_declaration_list, method) // Not needed since we inherit from iterator_visitor_c!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1533
// NOTE: Input variables can take any initial value, so we can not set the const_value annotation => we set fixed_init_value to false !!!
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1534
//       We must still visit it iteratively, to set the const_value of all literals in the type declarations.
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1535
void *constant_propagation_c::visit(input_declarations_c *symbol) {return handle_var_decl(symbol->input_declaration_list, false);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1536
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1537
/* helper symbol for input_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1538
//SYM_LIST(input_declaration_list_c)                                     // Not needed!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1539
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1540
/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1541
/* option -> may be NULL ! */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1542
//SYM_REF3(output_declarations_c, option, var_init_decl_list, method) 
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1543
void *constant_propagation_c::visit(output_declarations_c *symbol) {return handle_var_decl(symbol->var_init_decl_list, !is_retain(symbol->option) && function_pou_);}
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1544
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1545
/*  VAR_IN_OUT var_declaration_list END_VAR */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1546
//SYM_REF1(input_output_declarations_c, var_declaration_list)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1547
// NOTE: Input variables can take any initial value, so we can not set the const_value annotation => we set fixed_init_value to false !!!
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1548
//       We must still visit it iteratively, to set the const_value of all literals in the type declarations.
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1549
void *constant_propagation_c::visit(input_output_declarations_c *symbol) {return handle_var_decl(symbol->var_declaration_list, false);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1550
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1551
/* helper symbol for input_output_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1552
/* var_declaration_list var_declaration ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1553
//SYM_LIST(var_declaration_list_c)                                       // Not needed since we inherit from iterator_visitor_c!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1554
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1555
/*  var1_list ':' array_specification */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1556
//SYM_REF2(array_var_declaration_c, var1_list, array_specification)      // We do not yet handle arrays! 
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1557
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1558
/*  var1_list ':' structure_type_name */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1559
//SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name) // We do not yet handle structures!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1560
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1561
/* VAR [CONSTANT] var_init_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1562
/* option -> may be NULL ! */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1563
//SYM_REF2(var_declarations_c, option, var_init_decl_list)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1564
void *constant_propagation_c::visit(var_declarations_c *symbol) {return handle_var_decl(symbol->var_init_decl_list, false);}
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1565
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1566
/*  VAR RETAIN var_init_decl_list END_VAR */
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1567
//SYM_REF1(retentive_var_declarations_c, var_init_decl_list)             // Not needed since we inherit from iterator_visitor_c!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1568
// NOTE: Retentive variables can take any initial value, so we can not set the const_value annotation => we set fixed_init_value to false !!!
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1569
//       We must still visit it iteratively, to set the const_value of all literals in the type declarations.
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1570
void *constant_propagation_c::visit(retentive_var_declarations_c *symbol) {return handle_var_decl(symbol->var_init_decl_list, false);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1571
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1572
#if 0  
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1573
// TODO
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1574
/*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1575
/* option -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1576
SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1577
/* helper symbol for located_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1578
/* located_var_decl_list located_var_decl ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1579
SYM_LIST(located_var_decl_list_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1580
/*  [variable_name] location ':' located_var_spec_init */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1581
/* variable_name -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1582
SYM_REF3(located_var_decl_c, variable_name, location, located_var_spec_init)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1583
#endif
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1584
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1585
/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1586
/* option -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1587
// SYM_REF2(external_var_declarations_c, option, external_declaration_list)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1588
void *constant_propagation_c::visit(external_var_declarations_c *symbol) {return handle_var_decl(symbol->external_declaration_list, is_constant(symbol->option));}
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1589
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1590
/* helper symbol for external_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1591
/*| external_declaration_list external_declaration';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1592
// SYM_LIST(external_declaration_list_c)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1593
// void *constant_propagation_c::visit(external_declaration_list_c *symbol) {} // Not needed: we inherit from iterator_c
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1594
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1595
/*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1596
//SYM_REF2(external_declaration_c, global_var_name, specification)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1597
void *constant_propagation_c::visit(external_declaration_c *symbol) {
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1598
  // The syntax does not allow VAR_EXTERN to be initialized. We must get the initial value from the corresponding VAR_GLOBAL declaration
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1599
  /* However, we only do this is if the visit() method for the Program/FB in which this VAR_EXTERN is found was called from the visit(configurtion/resource) visitor!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1600
   * When we are called from the visit(library_c) visitor, we do not have the required information to do this!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1601
   */ 
983
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1602
  if (NULL != current_configuration) {
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1603
    /* before copying the constant value from the VAR_GLOBAL declaration (which is stored in the var_global_values[] map)
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1604
     * we check to see if the VAR_EXTERN constant values has already been set by a previous call to constant fold the POU
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1605
     * in which this VAR_EXTERN is found we simply check to see if any const value of this VAR_EXTERN variable has already
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1606
     * been set previously!
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1607
     */
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1608
    if (   !IS_UNDEFINED( int64, symbol->specification) || !IS_UNDEFINED(uint64, symbol->specification) 
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1609
        || !IS_UNDEFINED(real64, symbol->specification) || !IS_UNDEFINED(  bool, symbol->specification)) {
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1610
      /* The const_value for this VAR_EXTERN has already been previously set. Lets check to see if it is the exact
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1611
       * same const value - if not we produce an error message!
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1612
       * 
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1613
       * NOTE: comparison is inverted with '!'
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1614
       */
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1615
      if (! (symbol->specification->const_value == var_global_values[get_var_name_c::get_name(symbol->global_var_name)->value]))
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1616
        STAGE3_ERROR(0, symbol, symbol, "The initial value of this external variable is ambiguous (the Program/FB in which "
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1617
                                        "this external variable is declared has been used to instantiate a Program/FB in more "
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1618
                                        "than one configuration and/or resource - and each resource sets the corresponding global "
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1619
                                        "variable to a distinct constant initial value).");
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1620
    }
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1621
    
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1622
    // only now do we copy the const value from the var_global to the var_external.
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1623
    symbol->specification->const_value = var_global_values[get_var_name_c::get_name(symbol->global_var_name)->value];
983
ead554e12195 Add check whether the same constant var_external variable is initialised with two (or more) different constant values.
mjsousa
parents: 982
diff changeset
  1624
  }
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1625
  
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1626
  symbol->global_var_name->const_value = symbol->specification->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1627
  if (fixed_init_value_) {
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1628
//  (*values)[symbol->global_var_name->get_value()] = symbol->specification->const_value;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1629
    (*values)[get_var_name_c::get_name(symbol->global_var_name)->value] = symbol->specification->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1630
  }
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1631
  // If the datatype specification is a subrange or array, do constant folding of all the literals in that type declaration... (ex: literals in array subrange limits)
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1632
  symbol->specification->accept(*this);  // should never get to change the const_value of the symbol->specification symbol (only its children!).
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1633
  return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1634
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1635
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1636
/* NOTE that the constant folding of GLOBAL variables is already handled by handle_var_extern_global_pair, which 
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1637
 * is called from declaration_check_c,
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1638
 * This is done like this because we need to know the pairing of external<->global variables to get the cvalue
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1639
 * from the global variable. Since the external<->global pairing information is available in the declaration_check_c,
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1640
 * we have that class call the constant_propagation_c::handle_var_extern_global_pair(), which will actually do the 
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1641
 * constant folding of the global and the external variable declarations!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1642
 */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1643
/* NOTE: The constant propagation portion of this algorithm must still be done here!!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1644
 * Even though the constant folding of GLOBAL variables are already handled by handle_var_extern_global_pair(),
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1645
 * we must still visit them here, since when doing constant propagation of a Configuration or a Resource we need the
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1646
 * values of constant variables to be placed in the values[] map, as these same variables may be used to declare
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1647
 * arrays of a variable size
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1648
 *    VAR_GLOBAL CONSTANT max     : INT := 42;             END_VAR
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1649
 *    VAR_GLOBAL          array_v : ARRAY [1..max] of INT; END_VAR  <---- NOTE the use of 'max' in the subrange!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1650
 */
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1651
/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1652
/* option -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1653
// SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1654
/* Note that calling handle_var_decl() will result in doing constant folding of literals (of datatype initial values)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1655
 * that were already constant folded by the method handle_var_extern_global_pair()
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1656
 * Nevertheless, since constant folding is idem-potent, it is simpler to just call handle_var_decl() instead
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1657
 * of writing some code specific for this situation!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1658
 */
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1659
void *constant_propagation_c::visit(global_var_declarations_c *symbol) {return handle_var_decl(symbol->global_var_decl_list, is_constant(symbol->option));}
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1660
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1661
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1662
/* helper symbol for global_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1663
/*| global_var_decl_list global_var_decl ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1664
// SYM_LIST(global_var_decl_list_c)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1665
// void *constant_propagation_c::visit(global_var_decl_list_c *symbol) {} // Not needed: we inherit from iterator_c
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1666
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1667
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1668
/* type_specification ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1669
//SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1670
void *constant_propagation_c::visit(global_var_decl_c *symbol) {
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1671
  /* global_var_spec may be either a global_var_spec_c or a global_var_list_c.
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1672
   * Since we already have a nice method that handles var lists (handle_var_list_decl() )
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1673
   * if it is a global_var_spec_c we will create a temporary list so we can call that method!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1674
   */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1675
  global_var_spec_c *var_spec = dynamic_cast<global_var_spec_c *>(symbol->global_var_spec);
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1676
  if (NULL == var_spec) {
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1677
    // global_var_spec is a global_var_list_c
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1678
    return handle_var_list_decl(symbol->global_var_spec, symbol->type_specification, true /* is global */);
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1679
  } else {
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1680
    global_var_list_c var_list;
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1681
    var_list.add_element(var_spec->global_var_name);
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1682
    return handle_var_list_decl(&var_list, symbol->type_specification, true /* is global */);
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1683
  }
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1684
}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1685
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1686
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1687
/*| global_var_name location */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1688
//SYM_REF2(global_var_spec_c, global_var_name, location)              // Not needed!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1689
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1690
/*  AT direct_variable */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1691
//SYM_REF1(location_c, direct_variable)                               // Not needed!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1692
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1693
/*| global_var_list ',' global_var_name */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1694
//SYM_LIST(global_var_list_c)                                         // Not needed!
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1695
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1696
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1697
#if 0  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1698
// TODO
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1699
// We do not do constant folding of strings yet, so there is no need to implement this now!
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1700
/*  var1_list ':' single_byte_string_spec */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1701
SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1702
/*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1703
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1704
/* single_byte_character_string ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1705
SYM_REF2(single_byte_string_spec_c, string_spec, single_byte_character_string)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1706
/*   STRING ['[' integer ']'] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1707
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1708
SYM_REF2(single_byte_limited_len_string_spec_c, string_type_name, character_string_len)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1709
/*  WSTRING ['[' integer ']'] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1710
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1711
SYM_REF2(double_byte_limited_len_string_spec_c, string_type_name, character_string_len)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1712
/*  var1_list ':' double_byte_string_spec */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1713
SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1714
/*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1715
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1716
/* double_byte_character_string ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1717
SYM_REF2(double_byte_string_spec_c, string_spec, double_byte_character_string)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1718
/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1719
/* option ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1720
SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1721
/* helper symbol for incompl_located_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1722
/*| incompl_located_var_decl_list incompl_located_var_decl ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1723
SYM_LIST(incompl_located_var_decl_list_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1724
/*  variable_name incompl_location ':' var_spec */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1725
SYM_REF3(incompl_located_var_decl_c, variable_name, incompl_location, var_spec)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1726
/*  AT incompl_location_token */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1727
SYM_TOKEN(incompl_location_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1728
/* intermediate helper symbol for:
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1729
 *  - non_retentive_var_decls
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1730
 *  - output_declarations
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1731
 */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1732
SYM_LIST(var_init_decl_list_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1733
#endif
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1734
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1735
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1736
/***********************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1737
/* B 1.5.1 - Functions */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1738
/***********************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1739
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1740
//SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body, enumvalue_symtable_t enumvalue_symtable;)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1741
void *constant_propagation_c::visit(function_declaration_c *symbol) {
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1742
	map_values_t local_values, *prev_pou_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1743
	prev_pou_values = values; // store the current values map of whoever called this Function (a program, configuration, or resource)
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1744
	values = &local_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1745
	var_global_values.push(); /* Create inner scope - Not really needed, but do it just to be consistent. */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1746
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1747
	/* Add initial value of all declared variables into Values map. */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1748
	function_pou_ = true;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1749
	symbol->var_declarations_list->accept(*this);
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1750
	function_pou_ = false;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1751
	symbol->function_body->accept(*this);
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1752
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1753
	var_global_values.pop(); /* Delete inner scope */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1754
	values = prev_pou_values;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1755
	return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1756
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1757
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1758
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1759
/* intermediate helper symbol for
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1760
 * - function_declaration
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1761
 * - function_block_declaration
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1762
 * - program_declaration
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1763
 */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1764
// SYM_LIST(var_declarations_list_c) // Not needed since we inherit from iterator_c
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1765
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1766
/* option -> storage method, CONSTANT or <null> */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1767
// SYM_REF2(function_var_decls_c, option, decl_list)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1768
// NOTE: function_var_decls_c is only used inside Functions, so it is safe to call with fixed_init_value_ = true 
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1769
void *constant_propagation_c::visit(function_var_decls_c *symbol) {return handle_var_decl(symbol->decl_list, true);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1770
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1771
/* intermediate helper symbol for function_var_decls */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1772
// SYM_LIST(var2_init_decl_list_c) // Not needed since we inherit from iterator_c
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1773
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1774
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1775
/*****************************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1776
/* B 1.5.2 - Function Blocks */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1777
/*****************************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1778
/*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1779
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1780
//SYM_REF3(function_block_declaration_c, fblock_name, var_declarations, fblock_body, enumvalue_symtable_t enumvalue_symtable;)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1781
void *constant_propagation_c::visit(function_block_declaration_c *symbol) {
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1782
	map_values_t local_values, *prev_pou_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1783
	prev_pou_values = values; // store the current values map of whoever instantited this FB (a program, configuration, or resource)
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1784
	values = &local_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1785
	var_global_values.push(); /* Create inner scope */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1786
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1787
	/* Add initial value of all declared variables into Values map. */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1788
	function_pou_ = false;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1789
	symbol->var_declarations->accept(*this);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1790
	symbol->fblock_body->accept(*this);
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1791
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1792
	var_global_values.pop(); /* Delete inner scope */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1793
	values = prev_pou_values;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1794
	return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1795
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1796
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1797
/*  VAR_TEMP temp_var_decl_list END_VAR */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1798
// SYM_REF1(temp_var_decls_c, var_decl_list)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1799
void *constant_propagation_c::visit(temp_var_decls_c *symbol) {return handle_var_decl(symbol->var_decl_list, true);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1800
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1801
/* intermediate helper symbol for temp_var_decls */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1802
// SYM_LIST(temp_var_decls_list_c)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1803
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1804
/*  VAR NON_RETAIN var_init_decl_list END_VAR */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1805
// SYM_REF1(non_retentive_var_decls_c, var_decl_list)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1806
// NOTE: non_retentive_var_decls_c is only used inside FBs and Programs, so it is safe to call with fixed_init_value_ = false 
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1807
void *constant_propagation_c::visit(non_retentive_var_decls_c *symbol) {return handle_var_decl(symbol->var_decl_list, false);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1808
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1809
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1810
/**********************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1811
/* B 1.5.3 - Programs */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1812
/**********************/
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1813
/*  PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1814
//SYM_REF3(program_declaration_c, program_type_name, var_declarations, function_block_body, enumvalue_symtable_t enumvalue_symtable;)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1815
void *constant_propagation_c::visit(program_declaration_c *symbol) {
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1816
	map_values_t local_values, *prev_pou_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1817
	prev_pou_values = values; // store the current values map of whoever instantited this Program (a configuration, or resource)
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1818
	values = &local_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1819
	var_global_values.push(); /* Create inner scope */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1820
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1821
	/* Add initial value of all declared variables into Values map. */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1822
	function_pou_ = false;
787
6e2671e0f1a8 Fix constant_folding missing call. [Bug found by Mario.]
Manuele Conti <conti.ma@alice.it>
parents: 783
diff changeset
  1823
	symbol->var_declarations->accept(*this);
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1824
	symbol->function_block_body->accept(*this);
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1825
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1826
	var_global_values.pop(); /* Delete inner scope */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1827
	values = prev_pou_values;
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1828
	return NULL;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1829
}
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1830
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1831
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1832
/********************************/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1833
/* B 1.7 Configuration elements */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1834
/********************************/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1835
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1836
/*
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1837
CONFIGURATION configuration_name
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1838
   optional_global_var_declarations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1839
   (resource_declaration_list | single_resource_declaration)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1840
   optional_access_declarations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1841
   optional_instance_specific_initializations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1842
END_CONFIGURATION
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1843
*/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1844
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1845
// SYM_REF5(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, 
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1846
//          enumvalue_symtable_t enumvalue_symtable; localvar_symbmap_t localvar_symbmap; localvar_symbvec_t localvar_symbvec;)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1847
void *constant_propagation_c::visit(configuration_declaration_c *symbol) {
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1848
	map_values_t local_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1849
	values = &local_values;
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1850
	var_global_values.clear(); /* Clear global variables map */
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1851
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1852
	/* Add initial value of all declared variables into Values map. */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1853
	function_pou_ = false;
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1854
	current_configuration = symbol;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1855
	iterator_visitor_c::visit(symbol); // let the base iterator class handle the rest (basically iterate through the whole configuration and do the constant folding!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1856
	current_configuration = NULL;
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1857
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1858
	values = NULL;
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1859
	return NULL;
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1860
}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1861
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1862
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1863
/* helper symbol for configuration_declaration */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1864
// SYM_LIST(resource_declaration_list_c)           // Not needed: we inherit from iterator_c
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1865
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1866
/*
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1867
RESOURCE resource_name ON resource_type_name
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1868
   optional_global_var_declarations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1869
   single_resource_declaration
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1870
END_RESOURCE
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1871
*/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1872
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1873
// SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration, 
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1874
//          enumvalue_symtable_t enumvalue_symtable; localvar_symbmap_t localvar_symbmap; localvar_symbvec_t localvar_symbvec;)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1875
void *constant_propagation_c::visit(resource_declaration_c *symbol) {
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1876
	var_global_values.push(); /* Create inner scope */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1877
	values->push(); /* Create inner scope */
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1878
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1879
	/* Add initial value of all declared variables into Values map. */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1880
	function_pou_ = false;
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1881
	symbol->global_var_declarations->accept(*this);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1882
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1883
	current_resource = symbol;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1884
	symbol->resource_declaration->accept(*this);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1885
	current_resource = NULL;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1886
// 	iterator_visitor_c::visit(symbol); // let the base iterator class handle the rest (basically iterate through the whole configuration and do the constant folding!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1887
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1888
	var_global_values.pop(); /* Delete inner scope */
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  1889
	values->pop(); /* Delete inner scope */
973
f86d5d6bb04e Do constant propagation of configuration/resource variables, taking into account scope of variables.
mjsousa
parents: 970
diff changeset
  1890
	return NULL;
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1891
}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1892
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1893
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1894
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1895
/* task_configuration_list program_configuration_list */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1896
// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1897
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1898
/* helper symbol for single_resource_declaration */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1899
// SYM_LIST(task_configuration_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1900
/* helper symbol for single_resource_declaration */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1901
// SYM_LIST(program_configuration_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1902
/* helper symbol for: (access_path, instance_specific_init) */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1903
// SYM_LIST(any_fb_name_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1904
/*  [resource_name '.'] global_var_name ['.' structure_element_name] */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1905
// SYM_REF3(global_var_reference_c, resource_name, global_var_name, structure_element_name)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1906
/*  prev_declared_program_name '.' symbolic_variable */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1907
// SYM_REF2(program_output_reference_c, program_name, symbolic_variable)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1908
/*  TASK task_name task_initialization */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1909
// SYM_REF2(task_configuration_c, task_name, task_initialization)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1910
/*  '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1911
// SYM_REF3(task_initialization_c, single_data_source, interval_data_source, priority_data_source)
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1912
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1913
/*  PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1914
/* NOTE: The parameter 'called_prog_declaration'is used to pass data between stage 3 and stage4 */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1915
// SYM_REF5(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements,
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1916
//          symbol_c *called_prog_declaration;)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1917
void *constant_propagation_c::visit(program_configuration_c *symbol) {
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1918
	/* find the declaration (i.e. the datatype) of the program being instantiated */
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1919
	// NOTE: we do not use symbol->datatype so this cost propagation algorithm will not depend on the fill/narrow datatypes algorithm!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1920
	program_type_symtable_t::iterator itr = program_type_symtable.find(symbol->program_type_name);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1921
	if (itr == program_type_symtable.end()) ERROR; // syntax parsing should not allow this!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1922
	program_declaration_c *prog_type = itr->second;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1923
	if (NULL == prog_type) ERROR; // syntax parsing should not allow this!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1924
	prog_type->accept(*this);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1925
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1926
	if (NULL != symbol->prog_conf_elements)
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1927
		symbol->prog_conf_elements->accept(*this);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1928
	return NULL;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1929
}
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1930
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1931
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1932
/* prog_conf_elements ',' prog_conf_element */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1933
// SYM_LIST(prog_conf_elements_c)
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1934
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1935
/*  fb_name WITH task_name */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1936
// SYM_REF2(fb_task_c, fb_name, task_name)
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1937
void *constant_propagation_c::visit(fb_task_c *symbol) {
982
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1938
	/* find the declaration (i.e. the datatype) of the FB being instantiated */
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1939
	// NOTE: we do not use symbol->datatype so this cost propagation algorithm will not depend on the fill/narrow datatypes algorithm!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1940
	symbol_c *fb_type_name = NULL;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1941
	
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1942
	if ((NULL == fb_type_name) && (NULL != current_configuration)) {
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1943
		search_var_instance_decl_c search_scope(current_configuration);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1944
		fb_type_name = search_scope.get_decl(symbol->fb_name);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1945
	}
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1946
	if ((NULL == fb_type_name) && (NULL != current_resource)) {
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1947
		search_var_instance_decl_c search_scope(current_resource);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1948
		fb_type_name = search_scope.get_decl(symbol->fb_name);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1949
	}
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1950
	if (NULL == fb_type_name) ERROR;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1951
	
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1952
	function_block_type_symtable_t::iterator itr = function_block_type_symtable.find(fb_type_name);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1953
	if (itr == function_block_type_symtable.end()) ERROR; // syntax parsing should not allow this!
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1954
	function_block_declaration_c *fb_type_decl = itr->second;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1955
	if (NULL == fb_type_decl) ERROR;	
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1956
	fb_type_decl->accept(*this);
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1957
	return NULL;
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1958
}
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1959
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1960
760b26477193 Change algorithm for propagating VAR_GLOBAL constant values to corresponding VAR_EXTERNAL.
mjsousa
parents: 981
diff changeset
  1961
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1962
/*  any_symbolic_variable ASSIGN prog_data_source */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1963
// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1964
/* any_symbolic_variable SENDTO data_sink */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1965
// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, data_sink)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1966
/* VAR_CONFIG instance_specific_init_list END_VAR */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1967
// SYM_REF1(instance_specific_initializations_c, instance_specific_init_list)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1968
/* helper symbol for instance_specific_initializations */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1969
// SYM_LIST(instance_specific_init_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1970
/* resource_name '.' program_name '.' {fb_name '.'}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1971
    ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1972
*/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1973
// SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1974
/* helper symbol for instance_specific_init */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1975
/* function_block_type_name ':=' structure_initialization */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1976
// SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1977
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1978
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1979
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1980
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
  1981
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1982
/***************************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1983
/* B.3 - Language ST (Structured Text) */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1984
/***************************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1985
/***********************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1986
/* B 3.1 - Expressions */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1987
/***********************/
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1988
#if DO_CONSTANT_PROPAGATION__
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1989
/* TODO: handle function invocations... */
633
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
  1990
// void *fill_candidate_datatypes_c::visit(function_invocation_c *symbol) {}
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1991
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1992
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1993
/*********************************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1994
/* B 3.2.1 Assignment Statements */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1995
/*********************************/
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  1996
void *constant_propagation_c::visit(assignment_statement_c *symbol) {
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1997
	std::string varName;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1998
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1999
	symbol->r_exp->accept(*this);
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  2000
	symbol->l_exp->accept(*this); // if the lvalue has an array, do contant folding of the array indexes!
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2001
	symbol->l_exp->const_value = symbol->r_exp->const_value;
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  2002
	(*values)[get_var_name_c::get_name(symbol->l_exp)->value] = symbol->l_exp->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  2003
	return NULL;
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  2004
}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  2005
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2006
/********************************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2007
/* B 3.2.3 Selection Statements */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2008
/********************************/
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  2009
void *constant_propagation_c::visit(if_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2010
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2011
	map_values_t values_statement_result;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2012
	map_values_t values_elsestatement_result;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2013
	map_values_t::iterator itr;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2014
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2015
	/* Optimize dead code */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2016
	symbol->expression->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2017
	if (VALID_CVALUE(bool, symbol->expression) && GET_CVALUE(bool, symbol->expression) == false)
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2018
		return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2019
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2020
	values_incoming = values; /* save incoming status */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2021
	symbol->statement_list->accept(*this);
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2022
	values_statement_result = values;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2023
	if (NULL != symbol->else_statement_list) {
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2024
		values = values_incoming;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2025
		symbol->else_statement_list->accept(*this);
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2026
		values_elsestatement_result = values;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2027
	} else
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  2028
		values_elsestatement_result = values_incoming;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2029
	values = inner_left_join_values(values_statement_result, values_elsestatement_result);
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2030
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2031
	return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2032
}
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2033
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2034
/********************************/
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2035
/* B 3.2.4 Iteration Statements */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2036
/********************************/
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  2037
void *constant_propagation_c::visit(for_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2038
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2039
	map_values_t values_statement_result;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2040
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2041
	values_incoming = values; /* save incoming status */
782
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  2042
	symbol->beg_expression->accept(*this);
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  2043
	symbol->end_expression->accept(*this);
988
3b12a6cf9fbd Do constant propagation of instantiated FBs, so that variable sized arrays can be declared in FBs too.
mjsousa
parents: 985
diff changeset
  2044
	(*values)[get_var_name_c::get_name(symbol->control_variable)->value]._int64.status = const_value_c::cs_non_const;
782
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  2045
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  2046
	/* Optimize dead code */
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2047
	if (NULL != symbol->by_expression) {
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2048
		symbol->by_expression->accept(*this);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2049
		if (VALID_CVALUE(int64, symbol->by_expression ) &&   GET_CVALUE(int64, symbol->by_expression ) > 0 &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2050
			VALID_CVALUE(int64, symbol->beg_expression) && VALID_CVALUE(int64, symbol->end_expression)     &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2051
			  GET_CVALUE(int64, symbol->beg_expression) >    GET_CVALUE(int64, symbol->end_expression))
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2052
			return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2053
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2054
		if (VALID_CVALUE(int64, symbol->by_expression ) &&   GET_CVALUE(int64, symbol->by_expression ) < 0 &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2055
			VALID_CVALUE(int64, symbol->beg_expression) && VALID_CVALUE(int64, symbol->end_expression)    &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2056
			  GET_CVALUE(int64, symbol->beg_expression) <    GET_CVALUE(int64, symbol->end_expression))
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2057
			return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2058
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2059
	} else {
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2060
		if (VALID_CVALUE(int64, symbol->beg_expression) && VALID_CVALUE(int64, symbol->end_expression)     &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2061
			  GET_CVALUE(int64, symbol->beg_expression) >    GET_CVALUE(int64, symbol->end_expression))
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2062
			return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2063
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2064
	}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2065
782
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  2066
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2067
	symbol->statement_list->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2068
	values_statement_result = values;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2069
	values = inner_left_join_values(values_statement_result, values_incoming);
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2070
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2071
	return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2072
}
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2073
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  2074
void *constant_propagation_c::visit(while_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2075
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2076
	map_values_t values_statement_result;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2077
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2078
	/* Optimize dead code */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2079
	symbol->expression->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2080
	if (VALID_CVALUE(bool, symbol->expression) && GET_CVALUE(bool, symbol->expression) == false)
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2081
		return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2082
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2083
	values_incoming = values; /* save incoming status */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2084
	symbol->statement_list->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2085
	values_statement_result = values;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2086
	values = inner_left_join_values(values_statement_result, values_incoming);
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2087
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2088
	return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2089
}
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2090
984
634269b0f104 Break constant_folding_c in two classes: constant_folding_c and constant_propagation_c
mjsousa
parents: 983
diff changeset
  2091
void *constant_propagation_c::visit(repeat_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2092
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2093
	map_values_t values_statement_result;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2094
790
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  2095
	values_incoming = values; /* save incoming status */
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  2096
	symbol->statement_list->accept(*this);
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  2097
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2098
	/* Optimize dead code */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2099
	symbol->expression->accept(*this);
790
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  2100
	if (VALID_CVALUE(bool, symbol->expression) && GET_CVALUE(bool, symbol->expression) == true)
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2101
		return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2102
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  2103
	values_statement_result = values;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2104
	values = inner_left_join_values(values_statement_result, values_incoming);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2105
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2106
	return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2107
}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  2108
792
78083edf93d5 disable not yet complete constant propagation algorithm (currently brocken and producing incorrect results),
Mario de Sousa <msousa@fe.up.pt>
parents: 791
diff changeset
  2109
#endif  // DO_CONSTANT_PROPAGATION__
78083edf93d5 disable not yet complete constant propagation algorithm (currently brocken and producing incorrect results),
Mario de Sousa <msousa@fe.up.pt>
parents: 791
diff changeset
  2110
78083edf93d5 disable not yet complete constant propagation algorithm (currently brocken and producing incorrect results),
Mario de Sousa <msousa@fe.up.pt>
parents: 791
diff changeset
  2111
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  2112
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  2113
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  2114