stage3/constant_folding.cc
author Mario de Sousa <msousa@fe.up.pt>
Thu, 30 Aug 2012 13:04:30 +0100
changeset 645 e01ede1c9862
parent 643 1cc0e1ca2aad
child 648 5ca2aabb8bcb
permissions -rw-r--r--
Allow the use of PRId64, PRIu64 and PRIx64 printf formating macros globally.
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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 absract 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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 *    actuall printing of errors for the print_datatype_errors_c class!
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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.value) = new_value; ((symbol)->const_value._##dtype.status) = symbol_c::cs_const_value;}
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#define GET_CVALUE(dtype, symbol)             ((symbol)->const_value._##dtype.value)
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#define SET_OVFLOW(dtype, symbol)             ((symbol)->const_value._##dtype.status) = symbol_c::cs_overflow
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#define SET_NONCONST(dtype, symbol)           ((symbol)->const_value._##dtype.status) = symbol_c::cs_non_const
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#define VALID_CVALUE(dtype, symbol)           (symbol_c::cs_const_value == (symbol)->const_value._##dtype.status)
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#define IS_OVFLOW(dtype, symbol)              (symbol_c::cs_overflow    == (symbol)->const_value._##dtype.status)
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#define ISZERO_CVALUE(dtype, symbol)          ((VALID_CVALUE(dtype, symbol)) && (GET_CVALUE(dtype, symbol) == 0))
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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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}
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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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}
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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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   217
   * So, we create our own strtouint64() and strtoint64() functions.
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   218
   * (We actually call them matiec_strtoint64() so they will not clash with any function
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   219
   *  that may be added to the standard library in the future).
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   220
   * We actually create several of each, and let the compiler choose which is the correct one,
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   221
   * 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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   234
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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   238
/* NOTE: it must ignore underscores! */
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   239
/* NOTE: To follow the basic structure used throughout the compiler's code, we should really be
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   240
 * writing this as a visitor_c (and do away with the dynamic casts!), but since we only have 3 distinct 
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   241
 * 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;
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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;
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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}
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 * exponent        [Ee]([+-]?){integer}
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 * integer         {digit}((_?{digit})*)
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 */
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real64_t extract_real_value(symbol_c *sym, bool *overflow) {
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  std::string str = "";
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  real_c *real_sym;
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  char   *endptr;
596
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  real64_t ret;
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  if ((real_sym = dynamic_cast<real_c *>(sym)) == NULL) ERROR;
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  for(unsigned int i = 0; i < strlen(real_sym->value); i++)
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    if (real_sym->value[i] != '_') str += real_sym->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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  #if    (real64_t  == float)
600
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    ret = strtof(str.c_str(),  &endptr);
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  #elif  (real64_t  == double)
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    ret = strtod(str.c_str(),  &endptr);
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  #elif  (real64_t  == long_double)
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    ret = strtold(str.c_str(), &endptr);
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  #else 
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    #error Could not determine which data type is being used for real64_t (defined in absyntax.hh). Aborting!
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  #endif
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   343
  if (overflow != NULL)
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    *overflow = (errno == ERANGE);
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  if (((errno != 0) && (errno != ERANGE)) || (*endptr != '\0'))
596
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    ERROR;
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  return ret;
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}
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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
/***        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
   359
/***********************************************************************/
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
/***********************************************************************/
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
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   363
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   364
/* NOTE:
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   365
 *   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
   366
 *   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
   367
 *   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
   368
 */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   369
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   370
/* 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
   371
 *       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
   372
 *
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   373
 *       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
   374
 */
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   375
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   376
/* 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
   377
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
   378
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   379
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   380
	/* 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
   381
	// 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
   382
	/* 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
   383
	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
   384
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   385
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   386
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   387
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   388
/* 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
   389
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
   390
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   391
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   392
	/* 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
   393
	// 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
   394
	/* Test by pre-condition: if b > a => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   395
	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
   396
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   397
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   398
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   399
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   400
/* 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
   401
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
   402
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   403
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   404
	/* 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
   405
	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
   406
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   407
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   408
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   409
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   410
/* 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
   411
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
   412
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   413
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   414
	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
   415
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   416
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   417
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   418
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   419
/* 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
   420
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
   421
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   422
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   423
	/* 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
   424
	if (false) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   425
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   426
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   427
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   428
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
   429
/* 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
   430
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
   431
	/* 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
   432
	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
   433
		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
   434
}
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   435
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   436
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   437
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   438
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   439
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   440
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   441
/* 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
   442
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
   443
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   444
		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
   445
	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
   446
	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
   447
	/* 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
   448
	if (((b > 0) && (a > (INT64_MAX - b)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   449
	 || ((b < 0) && (a < (INT64_MIN - b))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   450
		SET_OVFLOW(int64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   451
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   452
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   453
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   454
/* 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
   455
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
   456
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   457
		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
   458
	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
   459
	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
   460
	/* 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
   461
	if (((b > 0) && (a < (INT64_MIN + b)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   462
	 || ((b < 0) && (a > (INT64_MAX + b))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   463
		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
   464
}
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
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   467
/* 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
   468
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
   469
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   470
		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
   471
	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
   472
	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
   473
	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
   474
	    || ( (a > 0) && !(b > 0) &&             (b < (INT64_MIN / a))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   475
	    || (!(a > 0) &&  (b > 0) &&             (a < (INT64_MIN / b))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   476
	    || (!(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
   477
		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
   478
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   479
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   480
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   481
/* 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
   482
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
   483
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   484
		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
   485
	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
   486
	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
   487
	if ((b == 0) || ((a == INT64_MIN) && (b == -1)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   488
		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
   489
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   490
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   491
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   492
/* 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
   493
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
   494
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   495
		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
   496
	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
   497
	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
   498
	/* 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
   499
	 *  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
   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
	 * 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
   502
	 * 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
   503
	 *
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   504
	 * 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
   505
	 */
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   506
	if ((a == INT64_MIN) && (b == -1))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   507
		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
   508
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   509
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   510
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   511
/* 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
   512
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
   513
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   514
		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
   515
	if (GET_CVALUE(int64, a) == INT64_MIN)
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   516
		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
   517
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   518
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   519
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   520
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
   521
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   522
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
   523
	if (!VALID_CVALUE(real64, res_ptr))
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   524
		return;
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   525
	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
   526
	/* 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
   527
	/* 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
   528
	 * "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
   529
	 *  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
   530
	 * 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
   531
	 */
607
be9ba3531afb cleaning up code. Changing HUGE_VAL to INFINITY.
Mario de Sousa <msousa@fe.up.pt>
parents: 604
diff changeset
   532
	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
   533
		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
   534
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   535
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
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   539
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   540
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   541
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   542
/***        Functions to execute operations on the const values      ***/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   543
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   544
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   545
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   546
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   547
/* 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
   548
#define handle_cmp(symbol, oper1, oper2, operation) {               \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   549
	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
   550
	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
   551
	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
   552
	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
   553
	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
   554
	return NULL;                                                \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   555
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   556
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   557
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   558
/* 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
   559
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
   560
	if (NULL == from) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   561
	to->const_value = from->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   562
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   563
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   564
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   565
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   566
/* unary negation (multiply by -1) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   567
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
   568
	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
   569
	/* 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
   570
	 *       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
   571
	 *
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   572
	 *       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
   573
	 *       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
   574
	 *       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
   575
	 *       v2 =  -(-9223372036854775808 );                               <------ MUST also be ILLEGAL 
640
ffa02cf2b335 Add some comments.
Mario de Sousa <msousa@fe.up.pt>
parents: 621
diff changeset
   576
	 */
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
   577
	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
   578
	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
   579
	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
   580
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   581
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   582
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   583
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   584
/* unary boolean negation (NOT) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   585
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
   586
	if (NULL == oper) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   587
	DO_UNARY_OPER(  bool, !, oper);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   588
	DO_UNARY_OPER(uint64, ~, oper);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   589
	return NULL;
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
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
   594
	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
   595
	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
   596
	DO_BINARY_OPER(uint64, | , uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   597
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   598
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   599
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   600
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   601
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
   602
	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
   603
	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
   604
	DO_BINARY_OPER(uint64, ^, uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   605
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   606
}
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
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
   610
	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
   611
	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
   612
	DO_BINARY_OPER(uint64, & , uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   613
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   614
}
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
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
   618
	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
   619
	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
   620
	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
   621
	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
   622
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   623
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   624
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   625
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   626
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
   627
	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
   628
	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
   629
	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
   630
	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
   631
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   632
}
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
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
   636
	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
   637
	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
   638
	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
   639
	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
   640
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   641
}
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
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
   645
	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
   646
	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
   647
	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
   648
	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
   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_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
   654
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   655
	/* 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
   656
	 *  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
   657
	 *
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   658
	 * 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
   659
	 * 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
   660
	 */
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
   661
	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
   662
	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
   663
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   664
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   665
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
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
   668
	/* 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
   669
	 *       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
   670
	 *       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
   671
	 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   672
	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
   673
		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
   674
	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
   675
		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
   676
	CHECK_OVERFLOW_real64(symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   677
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   678
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   679
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   680
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   681
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   682
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   683
/***        Helper functions for handling IL instruction lists.      ***/
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
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   688
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   689
/* 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! */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   690
#define intersect_prev_CVALUE_(dtype, symbol) {                                                                   \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   691
	symbol->const_value._##dtype = symbol->prev_il_instruction[0]->const_value._##dtype;                      \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   692
	for (unsigned int i = 1; i < symbol->prev_il_instruction.size(); i++) {                                   \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   693
		if (!ISEQUAL_CVALUE(dtype, symbol, symbol->prev_il_instruction[i]))                               \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   694
			{SET_NONCONST(dtype, symbol); break;}                                                     \
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
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   697
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   698
static void intersect_prev_cvalues(il_instruction_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   699
	if (symbol->prev_il_instruction.empty())
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   700
		return;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   701
	intersect_prev_CVALUE_(real64, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   702
	intersect_prev_CVALUE_(uint64, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   703
	intersect_prev_CVALUE_( int64, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   704
	intersect_prev_CVALUE_(  bool, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   705
}
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   706
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   707
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   708
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
   709
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   710
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   711
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   712
/***        The constant_folding_c                                   ***/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   713
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   714
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   715
/***********************************************************************/
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   716
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   717
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   718
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   719
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   720
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   721
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   722
constant_folding_c::constant_folding_c(symbol_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   723
    error_count = 0;
568
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   724
    warning_found = false;
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   725
    current_display_error_level = 0;
568
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   726
    
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   727
    /* check whether the platform on which the compiler is being run implements IEC 559 floating point data types. */
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   728
    symbol_c null_symbol;
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   729
    if (! (std::numeric_limits<real64_t>::is_iec559) )
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   730
        STAGE3_WARNING(&null_symbol, &null_symbol, "The platform running the compiler does not implement IEC 60559 floating point numbers. "
568
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   731
                                                   "Any error and/or warning messages related to overflow/underflow of the result of operations on REAL/LREAL literals "
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   732
                                                   "(i.e. constant folding) may themselves be erroneous, although are most probably correct."
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   733
                                                   "However, more likely is the possible existance of overflow/underflow errors that are not detected.");
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   734
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   735
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
   736
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   737
constant_folding_c::~constant_folding_c(void) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   738
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   739
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
   740
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   741
int constant_folding_c::get_error_count() {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   742
	return error_count;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   743
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   744
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   745
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   746
/*********************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   747
/* B 1.2 - Constants */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   748
/*********************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   749
/******************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   750
/* B 1.2.1 - Numeric Literals */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   751
/******************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   752
void *constant_folding_c::visit(real_c *symbol) {
576
8368ec909825 Fix extract_real (thanks Manuele), and add check for overflow.
Mario de Sousa <msousa@fe.up.pt>
parents: 575
diff changeset
   753
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   754
	SET_CVALUE(real64, symbol, extract_real_value(symbol, &overflow));
576
8368ec909825 Fix extract_real (thanks Manuele), and add check for overflow.
Mario de Sousa <msousa@fe.up.pt>
parents: 575
diff changeset
   755
	if (overflow) SET_OVFLOW(real64, symbol);
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
   756
	return NULL;
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   757
}
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   758
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   759
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   760
void *constant_folding_c::visit(integer_c *symbol) {
587
1ecf916cc397 Fix extract_integer_value.
Manuele Conti <conti.ma@alice.it>
parents: 579
diff changeset
   761
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   762
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
588
3d72d09bd40f Add missing set overflow flag.
Manuele Conti <conti.ma@alice.it>
parents: 587
diff changeset
   763
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   764
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
588
3d72d09bd40f Add missing set overflow flag.
Manuele Conti <conti.ma@alice.it>
parents: 587
diff changeset
   765
	if (overflow) SET_OVFLOW(uint64, symbol);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   766
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   767
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   768
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
   769
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   770
void *constant_folding_c::visit(neg_real_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   771
	symbol->exp->accept(*this);
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
   772
	DO_UNARY_OPER(real64, -, symbol->exp); CHECK_OVERFLOW_real64(symbol);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   773
	if (IS_OVFLOW(real64, symbol->exp)) SET_OVFLOW(real64, symbol);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   774
	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
   775
}
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   776
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   777
569
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   778
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   779
/* | '-' integer	{$$ = new neg_integer_c($2, locloc(@$));} */
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   780
void *constant_folding_c::visit(neg_integer_c *symbol) {
569
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   781
	symbol->exp->accept(*this);
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
   782
	/* Note that due to syntax restrictions, the value of symbol->exp will always be positive. 
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   783
	 * However, the following code does not depend on that restriction.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   784
	 */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   785
	/* The remainder of the code (for example, data type checking) considers the neg_integer_c as a leaf of the
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   786
	 * abstract syntax tree, and therefore simply ignores the values of neg_integer_c->exp.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   787
	 * For this reason only, and in only this situation, we must guarantee that any 'overflow' situation in 
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   788
	 * the cvalue of neg_integer_c->exp is also reflected back to this neg_integer_c symbol.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   789
	 * For the rest of the code we do NOT do this, as it would gurantee that a single overflow deep inside
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   790
	 * an expression would imply that the expression itself would also be set to 'overflow' condition.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   791
	 * This in turn would then have the compiler produce a whole load of error messages where they are not wanted!
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   792
	 */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   793
	DO_UNARY_OPER(uint64, -, symbol->exp); CHECK_OVERFLOW_uint64_NEG(symbol, symbol->exp);  /* handle the uintv := -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
   794
	if (IS_OVFLOW(uint64, symbol->exp)) SET_OVFLOW(uint64, symbol);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   795
	DO_UNARY_OPER( int64, -, symbol->exp); CHECK_OVERFLOW_int64_NEG (symbol, symbol->exp);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   796
	if (IS_OVFLOW( int64, symbol->exp)) SET_OVFLOW( int64, symbol);
590
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   797
	/* NOTE 1: INT64_MIN = -(INT64_MAX + 1)   ---> assuming two's complement representation!!!
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   798
	 * NOTE 2: if the user happens to want INT_MIN, that value will first be parsed as a positive integer, before being negated here.
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   799
	 * However, the positive value cannot be stored inside an int64! So, in this case, we will get the value from the uint64 cvalue.
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
   800
	 *
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   801
	 * This same situation is usually considered an overflow (check handle_neg() function). However, here we have a special
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   802
	 * situation. If we do not allow this, then the user would never the able to use the following code:
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   803
	 *  VAR v : LINT; 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
   804
	 *    v := -9223372036854775809 ; (* - |INT64_MIN| == INT64_MIN *)
590
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   805
	 */
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   806
	// if (INT64_MIN == -INT64_MAX - 1) // We do not really need to check that the platform uses two's complement
621
e3616f6b6959 Remove remaining signed/unsigned comparison error messages when compiling.
Mario de Sousa <msousa@fe.up.pt>
parents: 612
diff changeset
   807
	if (VALID_CVALUE(uint64, symbol->exp) && (GET_CVALUE(uint64, symbol->exp) == (uint64_t)INT64_MAX+1)) {
590
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   808
		SET_CVALUE(int64, symbol, INT64_MIN);
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   809
	}
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   810
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   811
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   812
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
   813
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   814
void *constant_folding_c::visit(binary_integer_c *symbol) {
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   815
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   816
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   817
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   818
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   819
	if (overflow) SET_OVFLOW(uint64, symbol);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   820
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   821
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   822
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
   823
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   824
void *constant_folding_c::visit(octal_integer_c *symbol) {
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   825
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   826
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   827
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   828
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   829
	if (overflow) SET_OVFLOW(uint64, symbol);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   830
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   831
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   832
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
   833
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   834
void *constant_folding_c::visit(hex_integer_c *symbol) {
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   835
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   836
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   837
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   838
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   839
	if (overflow) SET_OVFLOW(uint64, symbol);
569
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   840
	return NULL;
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   841
}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   842
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   843
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   844
/*
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   845
integer_literal:
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   846
  integer_type_name '#' signed_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   847
| integer_type_name '#' binary_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   848
| integer_type_name '#' octal_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   849
| integer_type_name '#' hex_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   850
*/
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   851
// SYM_REF2(integer_literal_c, type, value)
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   852
void *constant_folding_c::visit(integer_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   853
	symbol->value->accept(*this);
575
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   854
	DO_UNARY_OPER( int64, /* none */, symbol->value);
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   855
	DO_UNARY_OPER(uint64, /* none */, symbol->value);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   856
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   857
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   858
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
   859
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   860
void *constant_folding_c::visit(real_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   861
	symbol->value->accept(*this);
575
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   862
	DO_UNARY_OPER(real64, /* none */, symbol->value);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   863
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   864
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   865
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
   866
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   867
void *constant_folding_c::visit(bit_string_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   868
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   869
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   870
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
   871
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   872
void *constant_folding_c::visit(boolean_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   873
	symbol->value->accept(*this);
575
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   874
	DO_UNARY_OPER(bool, /* none */, symbol->value);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   875
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   876
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   877
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
   878
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   879
void *constant_folding_c::visit(boolean_true_c *symbol) {
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   880
	SET_CVALUE(bool, symbol, true);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   881
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   882
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   883
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
   884
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   885
void *constant_folding_c::visit(boolean_false_c *symbol) {
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   886
	SET_CVALUE(bool, symbol, false);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   887
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   888
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   889
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   890
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   891
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   892
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   893
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   894
/****************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   895
/* B.2 - Language IL (Instruction List) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   896
/****************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   897
/***********************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   898
/* B 2.1 Instructions and Operands */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   899
/***********************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   900
/* Not needed, since we inherit from iterator_visitor_c */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   901
/*| instruction_list il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   902
// SYM_LIST(instruction_list_c)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   903
// void *constant_folding_c::visit(instruction_list_c *symbol) {}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   904
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   905
/* | label ':' [il_incomplete_instruction] eol_list */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   906
// SYM_REF2(il_instruction_c, label, il_instruction)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   907
// void *visit(instruction_list_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   908
void *constant_folding_c::visit(il_instruction_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   909
	if (NULL == symbol->il_instruction) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   910
		/* This empty/null il_instruction does not change the value of the current/default IL variable.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   911
		 * So it inherits the candidate_datatypes from it's previous IL instructions!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   912
		 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   913
		intersect_prev_cvalues(symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   914
	} else {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   915
		il_instruction_c fake_prev_il_instruction = *symbol;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   916
		intersect_prev_cvalues(&fake_prev_il_instruction);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   917
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   918
		if (symbol->prev_il_instruction.size() == 0)  prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   919
		else                                          prev_il_instruction = &fake_prev_il_instruction;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   920
		symbol->il_instruction->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   921
		prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   922
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   923
		/* This object has (inherits) the same cvalues as the il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   924
		symbol->const_value = symbol->il_instruction->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   925
	}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   926
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   927
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   928
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   929
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   930
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   931
void *constant_folding_c::visit(il_simple_operation_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   932
	/* determine the cvalue of the operand */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   933
	if (NULL != symbol->il_operand) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   934
		symbol->il_operand->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   935
	}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   936
	/* determine the cvalue resulting from executing the il_operator... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   937
	il_operand = symbol->il_operand;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   938
	symbol->il_simple_operator->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   939
	il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   940
	/* This object has (inherits) the same cvalues as the il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   941
	symbol->const_value = symbol->il_simple_operator->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   942
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   943
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   944
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   945
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   946
/* TODO: handle function invocations... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   947
/* | function_name [il_operand_list] */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   948
/* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   949
// SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   950
// void *constant_folding_c::visit(il_function_call_c *symbol) {}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   951
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   952
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   953
/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   954
// SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   955
void *constant_folding_c::visit(il_expression_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   956
  symbol_c *prev_il_instruction_backup = prev_il_instruction;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   957
  
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   958
  if (NULL != symbol->il_operand)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   959
    symbol->il_operand->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   960
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   961
  if(symbol->simple_instr_list != NULL)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   962
    symbol->simple_instr_list->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   963
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   964
  /* Now do the operation,  */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   965
  il_operand = symbol->simple_instr_list;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   966
  prev_il_instruction = prev_il_instruction_backup;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   967
  symbol->il_expr_operator->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   968
  il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   969
  
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   970
  /* This object has (inherits) the same cvalues as the il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   971
  symbol->const_value = symbol->il_expr_operator->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   972
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   973
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   974
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   975
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   976
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   977
void *constant_folding_c::visit(il_jump_operation_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   978
  /* recursive call to fill const values... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   979
  il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   980
  symbol->il_jump_operator->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   981
  il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   982
  /* This object has (inherits) the same cvalues as the il_jump_operator */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   983
  symbol->const_value = symbol->il_jump_operator->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   984
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   985
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   986
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   987
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   988
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   989
/* FB calls leave the value in the accumulator unchanged */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   990
/*   il_call_operator prev_declared_fb_name
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   991
 * | il_call_operator prev_declared_fb_name '(' ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   992
 * | il_call_operator prev_declared_fb_name '(' eol_list ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   993
 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   994
 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   995
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   996
/* 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 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   997
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   998
void *constant_folding_c::visit(il_fb_call_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   999
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1000
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1001
/* TODO: handle function invocations... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1002
/* | function_name '(' eol_list [il_param_list] ')' */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1003
/* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1004
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1005
// void *constant_folding_c::visit(il_formal_funct_call_c *symbol) {return NULL;}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1006
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1007
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1008
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1009
/* Not needed, since we inherit from iterator_visitor_c */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1010
//  void *constant_folding_c::visit(il_operand_list_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1011
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1012
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1013
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1014
/* | simple_instr_list il_simple_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1015
/* This object is referenced by il_expression_c objects */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1016
void *constant_folding_c::visit(simple_instr_list_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1017
  if (symbol->n <= 0)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1018
    return NULL;  /* List is empty! Nothing to do. */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1019
    
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1020
  for(int i = 0; i < symbol->n; i++)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1021
    symbol->elements[i]->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1022
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1023
  /* This object has (inherits) the same cvalues as the il_jump_operator */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1024
  symbol->const_value = symbol->elements[symbol->n-1]->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1025
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1026
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1027
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1028
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1029
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1030
// SYM_REF1(il_simple_instruction_c, il_simple_instruction, symbol_c *prev_il_instruction;)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1031
void *constant_folding_c::visit(il_simple_instruction_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1032
  if (symbol->prev_il_instruction.size() > 1) ERROR; /* There should be no labeled insructions inside an IL expression! */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1033
  if (symbol->prev_il_instruction.size() == 0)  prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1034
  else                                          prev_il_instruction = symbol->prev_il_instruction[0];
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1035
  symbol->il_simple_instruction->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1036
  prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1037
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1038
  /* This object has (inherits) the same cvalues as the il_jump_operator */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1039
  symbol->const_value = symbol->il_simple_instruction->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1040
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1041
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1042
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1043
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1044
/*
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1045
    void *visit(il_param_list_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1046
    void *visit(il_param_assignment_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1047
    void *visit(il_param_out_assignment_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1048
*/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1049
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1050
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1051
/*******************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1052
/* B 2.2 Operators */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1053
/*******************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1054
void *constant_folding_c::visit(   LD_operator_c *symbol) {return handle_move(symbol, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1055
void *constant_folding_c::visit(  LDN_operator_c *symbol) {return handle_not (symbol, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1056
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1057
/* NOTE: we are implementing a constant folding algorithm, not a constant propagation algorithm.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1058
 *       For the constant propagation algorithm, the correct implementation of ST(N)_operator_c would be...
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1059
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1060
//void *constant_folding_c::visit(   ST_operator_c *symbol) {return handle_move(il_operand, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1061
//void *constant_folding_c::visit(  STN_operator_c *symbol) {return handle_not (il_operand, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1062
void *constant_folding_c::visit(   ST_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1063
void *constant_folding_c::visit(  STN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1064
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1065
/* NOTE: the standard allows syntax in which the NOT operator is followed by an optional <il_operand>
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1066
 *              NOT [<il_operand>]
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1067
 *       However, it does not define the semantic of the NOT operation when the <il_operand> is specified.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1068
 *       We therefore consider it an error if an il_operand is specified! This error will be caught elsewhere!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1069
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1070
void *constant_folding_c::visit(  NOT_operator_c *symbol) {return handle_not(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1071
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1072
/* NOTE: Since we are only implementing a constant folding algorithm, and not a constant propagation algorithm,
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1073
 *       the following IL instructions do not change/set the value of the il_operand!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1074
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1075
void *constant_folding_c::visit(    S_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1076
void *constant_folding_c::visit(    R_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1077
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1078
/* FB calls leave the value in the accumulator unchanged */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1079
void *constant_folding_c::visit(   S1_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1080
void *constant_folding_c::visit(   R1_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1081
void *constant_folding_c::visit(  CLK_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1082
void *constant_folding_c::visit(   CU_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1083
void *constant_folding_c::visit(   CD_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1084
void *constant_folding_c::visit(   PV_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1085
void *constant_folding_c::visit(   IN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1086
void *constant_folding_c::visit(   PT_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1087
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1088
void *constant_folding_c::visit(  AND_operator_c *symbol) {return handle_and (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1089
void *constant_folding_c::visit(   OR_operator_c *symbol) {return handle_or  (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1090
void *constant_folding_c::visit(  XOR_operator_c *symbol) {return handle_xor (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1091
void *constant_folding_c::visit( ANDN_operator_c *symbol) {       handle_and (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1092
void *constant_folding_c::visit(  ORN_operator_c *symbol) {       handle_or  (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1093
void *constant_folding_c::visit( XORN_operator_c *symbol) {       handle_xor (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1094
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1095
void *constant_folding_c::visit(  ADD_operator_c *symbol) {return handle_add (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1096
void *constant_folding_c::visit(  SUB_operator_c *symbol) {return handle_sub (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1097
void *constant_folding_c::visit(  MUL_operator_c *symbol) {return handle_mul (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1098
void *constant_folding_c::visit(  DIV_operator_c *symbol) {return handle_div (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1099
void *constant_folding_c::visit(  MOD_operator_c *symbol) {return handle_mod (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1100
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1101
void *constant_folding_c::visit(   GT_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, > );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1102
void *constant_folding_c::visit(   GE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, >=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1103
void *constant_folding_c::visit(   EQ_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, ==);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1104
void *constant_folding_c::visit(   LT_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, < );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1105
void *constant_folding_c::visit(   LE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, <=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1106
void *constant_folding_c::visit(   NE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, !=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1107
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1108
void *constant_folding_c::visit(  CAL_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1109
void *constant_folding_c::visit(  RET_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1110
void *constant_folding_c::visit(  JMP_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1111
void *constant_folding_c::visit( CALC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1112
void *constant_folding_c::visit(CALCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1113
void *constant_folding_c::visit( RETC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1114
void *constant_folding_c::visit(RETCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1115
void *constant_folding_c::visit( JMPC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1116
void *constant_folding_c::visit(JMPCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1117
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1118
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
  1119
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
  1120
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1121
/***************************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1122
/* B.3 - Language ST (Structured Text) */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1123
/***************************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1124
/***********************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1125
/* B 3.1 - Expressions */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1126
/***********************/
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1127
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1128
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1129
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1130
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1131
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, ==);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1132
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, !=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1133
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, < );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1134
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, > );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1135
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, <=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1136
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, >=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1137
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1138
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1139
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1140
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1141
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1142
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1143
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);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1144
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1145
void *constant_folding_c::visit(   neg_expression_c *symbol) {symbol->  exp->accept(*this); return handle_neg(symbol, symbol->exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1146
void *constant_folding_c::visit(   not_expression_c *symbol) {symbol->  exp->accept(*this); return handle_not(symbol, symbol->exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1147
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1148
/* TODO: handle function invocations... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1149
// void *fill_candidate_datatypes_c::visit(function_invocation_c *symbol) {}