author | Mario de Sousa <msousa@fe.up.pt> |
Wed, 31 Aug 2011 14:10:53 +0100 | |
changeset 371 | 926490780952 |
parent 360 | f4ce1b1c2112 |
child 390 | 9cf96d45853d |
permissions | -rwxr-xr-x |
204 | 1 |
/* |
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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) 2009-2011 Mario de Sousa (msousa@fe.up.pt) |
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* Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant |
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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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/* Verify whether the semantic rules of data type compatibility are being followed. |
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* |
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* For example: |
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*/ |
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#include "../absyntax_utils/absyntax_utils.hh" |
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class visit_expression_type_c: public search_constant_type_c { |
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private: |
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search_varfb_instance_type_c *search_varfb_instance_type; |
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search_base_type_c search_base_type; |
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/* When calling a function block, we must first find it's type, |
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* by searching through the declarations of the variables currently |
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* in scope. |
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* This class does just that... |
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* A new bject instance is instantiated whenever we start checking semantics |
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* for a function block type declaration, or a program declaration. |
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* This object instance will then later be called while the |
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* function block's or the program's body is being handled. |
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* |
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* Note that functions cannot contain calls to function blocks, |
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* so we do not create an object instance when handling |
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* a function declaration. |
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*/ |
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// search_var_instance_decl_c *search_var_instance_decl; |
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/* This variable was created to pass information from |
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* visit_expression_type_c::visit(case_statement_c *symbol) function to |
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* visit_expression_type_c::visit(case_list_c *symbol) function. |
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*/ |
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symbol_c *case_expression_type; |
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/* In IL code, once we find a type mismatch error, it is best to |
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* ignore any further errors until the end of the logicl operation, |
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* i.e. until the next LD. |
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* However, we cannot clear the il_error flag on all LD operations, |
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* as these may also be used within parenthesis. LD operations |
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* within parenthesis may not clear the error flag. |
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* We therefore need a counter to know how deep inside a parenthesis |
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* structure we are. |
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*/ |
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int il_parenthesis_level; |
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bool il_error; |
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bool error_found; |
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/* the current data type of the data stored in the IL stack, i.e. the default variable */ |
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symbol_c *il_default_variable_type; |
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/* the current IL operand being analysed - its symbol and its data type */ |
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symbol_c *il_operand_type; |
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symbol_c *il_operand; |
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public: |
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visit_expression_type_c(symbol_c *ignore); |
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virtual ~visit_expression_type_c(void); |
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bool get_error_found(void); |
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typedef struct { |
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symbol_c *value; |
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symbol_c *type; |
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} value_and_type_t; |
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/* A helper function... */ |
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bool is_ANY_ELEMENTARY_type (symbol_c *type_symbol); |
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bool is_ANY_SAFEELEMENTARY_type (symbol_c *type_symbol); |
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bool is_ANY_ELEMENTARY_compatible (symbol_c *type_symbol); |
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bool is_ANY_MAGNITUDE_type (symbol_c *type_symbol); |
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bool is_ANY_SAFEMAGNITUDE_type (symbol_c *type_symbol); |
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bool is_ANY_MAGNITUDE_compatible (symbol_c *type_symbol); |
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bool is_ANY_DATE_type (symbol_c *type_symbol); |
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bool is_ANY_SAFEDATE_type (symbol_c *type_symbol); |
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bool is_ANY_DATE_compatible (symbol_c *type_symbol); |
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bool is_ANY_STRING_type (symbol_c *type_symbol); |
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bool is_ANY_SAFESTRING_type (symbol_c *type_symbol); |
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bool is_ANY_STRING_compatible (symbol_c *type_symbol); |
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bool is_ANY_INT_type (symbol_c *type_symbol); |
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bool is_ANY_SAFEINT_type (symbol_c *type_symbol); |
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bool is_ANY_INT_compatible (symbol_c *type_symbol); |
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bool is_ANY_REAL_type (symbol_c *type_symbol); |
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bool is_ANY_SAFEREAL_type (symbol_c *type_symbol); |
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bool is_ANY_REAL_compatible (symbol_c *type_symbol); |
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bool is_ANY_NUM_type (symbol_c *type_symbol); |
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bool is_ANY_SAFENUM_type (symbol_c *type_symbol); |
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bool is_ANY_NUM_compatible (symbol_c *type_symbol); |
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bool is_ANY_BIT_type (symbol_c *type_symbol); |
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bool is_ANY_SAFEBIT_type (symbol_c *type_symbol); |
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bool is_ANY_BIT_compatible (symbol_c *type_symbol); |
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bool is_BOOL_type (symbol_c *type_symbol); |
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bool is_SAFEBOOL_type (symbol_c *type_symbol); |
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bool is_ANY_BOOL_compatible (symbol_c *type_symbol); |
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bool is_nonneg_literal_integer_type (symbol_c *type_symbol); |
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bool is_literal_integer_type (symbol_c *type_symbol); |
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bool is_literal_real_type (symbol_c *type_symbol); |
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bool is_literal_bool_type (symbol_c *type_symbol); |
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/* Determine the common data type between two data types. |
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* If no common data type found, return NULL. |
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* |
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* If data types are identical, return the first (any would do...). |
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* If any of the datat types is a literal, we confirm that |
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* the literal uses less bits than the fixed size data type. |
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* e.g. BYTE and 1024 returns NULL |
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* BYTE and 255 returns BYTE |
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* |
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* If two literals, then return the literal that requires more bits... |
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*/ |
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symbol_c *common_type__(symbol_c *first_type, symbol_c *second_type); |
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/* Determine the common data type between two data types. |
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* Unlike the common_type__() function, we stop the compiler with an ERROR |
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* if no common data type is found. |
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*/ |
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symbol_c *common_type(symbol_c *first_type, symbol_c *second_type); |
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/* Return TRUE if the second (value) data type may be assigned to a variable of the first (variable) data type |
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* such as: |
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* var_type value_type |
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* BOOL BYTE#7 -> returns false |
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* INT INT#7 -> returns true |
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* INT 7 -> returns true |
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* REAL 7.89 -> returns true |
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* REAL 7 -> returns true |
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* INT 7.89 -> returns false |
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* SAFEBOOL BOOL#1 -> returns false !!! |
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* etc... |
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* |
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* NOTE: It is assumed that the var_type is the data type of an lvalue |
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*/ |
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bool is_valid_assignment(symbol_c *var_type, symbol_c *value_type); |
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/* Return TRUE if there is a common data type, otherwise return FALSE |
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* i.e., return TRUE if both data types may be used simultaneously in an expression |
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* such as: |
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* BOOL#0 AND BYTE#7 -> returns false |
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* 0 AND BYTE#7 -> returns true |
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* INT#10 AND INT#7 -> returns true |
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* INT#10 AND 7 -> returns true |
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* REAL#34.3 AND 7.89 -> returns true |
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* REAL#34.3 AND 7 -> returns true |
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* INT#10 AND 7.89 -> returns false |
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* SAFEBOOL#0 AND BOOL#1 -> returns true !!! |
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* etc... |
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*/ |
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bool is_compatible_type(symbol_c *first_type, symbol_c *second_type); |
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/* check semantics of FB call in the IL language using input operators */ |
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/* e.g. CU, CLK, IN, PT, SR, ... */ |
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void check_il_fbcall(symbol_c *symbol, const char *input_operator); |
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/* check the semantics of a FB or Function non-formal call */ |
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/* e.g. foo(1, 2, 3, 4); */ |
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/* If error_count pointer is NULL, print out error messages. |
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* If error_count pointer is != NULL, do not print out error messages, but tally up |
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* how many errors were found. |
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*/ |
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void check_nonformal_call(symbol_c *f_call, symbol_c *f_decl, bool use_il_defvar = false, int *error_count = NULL); |
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/* check the semantics of a FB or Function formal call */ |
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/* e.g. foo(IN1 := 1, OUT1 =>x, EN := true); */ |
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/* If error_count pointer is NULL, print out error messages. |
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* If error_count pointer is != NULL, do not print out error messages, but tally up |
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* how many errors were found. |
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*/ |
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void check_formal_call(symbol_c *f_call, symbol_c *f_decl, int *error_count = NULL); |
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void *compute_standard_function_default(function_invocation_c *st_symbol, il_formal_funct_call_c *il_symbol); |
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void *compute_standard_function_il(il_function_call_c *symbol, symbol_c *param_data_type); |
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/* A helper function... */ |
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typedef bool (visit_expression_type_c::*is_data_type_t)(symbol_c *type_symbol); /* a pointer to a function! */ |
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// symbol_c *compute_boolean_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type); |
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// symbol_c *compute_numeric_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type); |
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// symbol_c *compute_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type); |
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symbol_c *compute_expression(symbol_c *left_type, symbol_c *right_type, is_data_type_t is_data_type, |
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symbol_c *left_expr, symbol_c *right_expr); |
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/* a helper function... */ |
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symbol_c *base_type(symbol_c *symbol); |
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/* a helper function... */ |
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void *verify_null(symbol_c *symbol); |
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
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void *visit(data_type_declaration_c *symbol); |
204 | 230 |
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/*********************/ |
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/* B 1.4 - Variables */ |
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/*********************/ |
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void *visit(symbolic_variable_c *symbol); |
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/********************************************/ |
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/* B 1.4.1 - Directly Represented Variables */ |
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/********************************************/ |
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void *visit(direct_variable_c *symbol); |
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/*************************************/ |
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/* B 1.4.2 - Multi-element variables */ |
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/*************************************/ |
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void *visit(array_variable_c *symbol); |
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void *visit(structured_variable_c *symbol); |
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/********************************/ |
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/* B 1.7 Configuration elements */ |
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/********************************/ |
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void *visit(configuration_declaration_c *symbol); |
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/****************************************/ |
204 | 254 |
/* B.2 - Language IL (Instruction List) */ |
255 |
/****************************************/ |
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/***********************************/ |
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257 |
/* B 2.1 Instructions and Operands */ |
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/***********************************/ |
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// void *visit(instruction_list_c *symbol); |
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260 |
void *visit(il_simple_operation_c *symbol); |
|
261 |
void *visit(il_function_call_c *symbol); |
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262 |
void *visit(il_expression_c *symbol); |
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263 |
// void *visit(il_jump_operation_c *symbol); |
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264 |
void *visit(il_fb_call_c *symbol); |
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265 |
void *visit(il_formal_funct_call_c *symbol); |
|
266 |
/* |
|
267 |
void *visit(il_operand_list_c *symbol); |
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268 |
void *visit(simple_instr_list_c *symbol); |
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269 |
void *visit(il_param_list_c *symbol); |
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270 |
void *visit(il_param_assignment_c *symbol); |
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271 |
void *visit(il_param_out_assignment_c *symbol); |
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272 |
*/ |
|
273 |
||
274 |
/*******************/ |
|
275 |
/* B 2.2 Operators */ |
|
276 |
/*******************/ |
|
277 |
void *visit(LD_operator_c *symbol); |
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278 |
void *visit(LDN_operator_c *symbol); |
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279 |
void *visit(ST_operator_c *symbol); |
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280 |
void *visit(STN_operator_c *symbol); |
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281 |
void *visit(NOT_operator_c *symbol); |
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282 |
void *visit(S_operator_c *symbol); |
|
283 |
void *visit(R_operator_c *symbol); |
|
284 |
void *visit(S1_operator_c *symbol); |
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285 |
void *visit(R1_operator_c *symbol); |
|
286 |
void *visit(CLK_operator_c *symbol); |
|
287 |
void *visit(CU_operator_c *symbol); |
|
288 |
void *visit(CD_operator_c *symbol); |
|
289 |
void *visit(PV_operator_c *symbol); |
|
290 |
void *visit(IN_operator_c *symbol); |
|
291 |
void *visit(PT_operator_c *symbol); |
|
292 |
void *visit(AND_operator_c *symbol); |
|
293 |
void *visit(OR_operator_c *symbol); |
|
294 |
void *visit(XOR_operator_c *symbol); |
|
295 |
void *visit(ANDN_operator_c *symbol); |
|
296 |
void *visit(ORN_operator_c *symbol); |
|
297 |
void *visit(XORN_operator_c *symbol); |
|
298 |
void *visit(ADD_operator_c *symbol); |
|
299 |
void *visit(SUB_operator_c *symbol); |
|
300 |
void *visit(MUL_operator_c *symbol); |
|
301 |
void *visit(DIV_operator_c *symbol); |
|
302 |
void *visit(MOD_operator_c *symbol); |
|
303 |
void *visit(GT_operator_c *symbol); |
|
304 |
void *visit(GE_operator_c *symbol); |
|
305 |
void *visit(EQ_operator_c *symbol); |
|
306 |
void *visit(LT_operator_c *symbol); |
|
307 |
void *visit(LE_operator_c *symbol); |
|
308 |
void *visit(NE_operator_c *symbol); |
|
309 |
void *visit(CAL_operator_c *symbol); |
|
310 |
void *visit(CALC_operator_c *symbol); |
|
311 |
void *visit(CALCN_operator_c *symbol); |
|
312 |
void *visit(RET_operator_c *symbol); |
|
313 |
void *visit(RETC_operator_c *symbol); |
|
314 |
void *visit(RETCN_operator_c *symbol); |
|
315 |
void *visit(JMP_operator_c *symbol); |
|
316 |
void *visit(JMPC_operator_c *symbol); |
|
317 |
void *visit(JMPCN_operator_c *symbol); |
|
318 |
/* Symbol class handled together with function call checks */ |
|
319 |
// void *visit(il_assign_operator_c *symbol, variable_name); |
|
320 |
/* Symbol class handled together with function call checks */ |
|
321 |
// void *visit(il_assign_operator_c *symbol, option, variable_name); |
|
322 |
||
323 |
||
324 |
||
325 |
/***************************************/ |
|
326 |
/* B.3 - Language ST (Structured Text) */ |
|
327 |
/***************************************/ |
|
328 |
/***********************/ |
|
329 |
/* B 3.1 - Expressions */ |
|
330 |
/***********************/ |
|
331 |
void *visit(or_expression_c *symbol); |
|
332 |
void *visit(xor_expression_c *symbol); |
|
333 |
void *visit(and_expression_c *symbol); |
|
334 |
void *visit(equ_expression_c *symbol); |
|
335 |
void *visit(notequ_expression_c *symbol); |
|
336 |
void *visit(lt_expression_c *symbol); |
|
337 |
void *visit(gt_expression_c *symbol); |
|
338 |
void *visit(le_expression_c *symbol); |
|
339 |
void *visit(ge_expression_c *symbol); |
|
340 |
void *visit(add_expression_c *symbol); |
|
341 |
void *visit(sub_expression_c *symbol); |
|
342 |
void *visit(mul_expression_c *symbol); |
|
343 |
void *visit(div_expression_c *symbol); |
|
344 |
void *visit(mod_expression_c *symbol); |
|
345 |
void *visit(power_expression_c *symbol); |
|
346 |
void *visit(neg_expression_c *symbol); |
|
347 |
void *visit(not_expression_c *symbol); |
|
348 |
void *visit(function_invocation_c *symbol); |
|
349 |
||
350 |
/*********************************/ |
|
351 |
/* B 3.2.1 Assignment Statements */ |
|
352 |
/*********************************/ |
|
353 |
void *visit(assignment_statement_c *symbol); |
|
354 |
||
355 |
/*****************************************/ |
|
356 |
/* B 3.2.2 Subprogram Control Statements */ |
|
357 |
/*****************************************/ |
|
358 |
void *visit(fb_invocation_c *symbol); |
|
359 |
||
360 |
/********************************/ |
|
361 |
/* B 3.2.3 Selection Statements */ |
|
362 |
/********************************/ |
|
363 |
||
364 |
void *visit(if_statement_c *symbol); |
|
365 |
// void *visit(elseif_statement_list_c *symbol); |
|
366 |
void *visit(elseif_statement_c *symbol); |
|
367 |
void *visit(case_statement_c *symbol); |
|
368 |
// void *visit(case_element_list_c *symbol); |
|
369 |
// void *visit(case_element_c *symbol); |
|
370 |
void *visit(case_list_c *symbol); |
|
371 |
||
372 |
/********************************/ |
|
373 |
/* B 3.2.4 Iteration Statements */ |
|
374 |
/********************************/ |
|
375 |
||
376 |
void *visit(for_statement_c *symbol); |
|
377 |
void *visit(while_statement_c *symbol); |
|
378 |
void *visit(repeat_statement_c *symbol); |
|
379 |
||
380 |
||
381 |
//TODO: delete this functions. Why are they needed? |
|
382 |
void *visit(program_declaration_c *symbol); |
|
383 |
void *visit(function_declaration_c *symbol); |
|
384 |
void *visit(function_block_declaration_c *symbol); |
|
385 |
||
386 |
}; // visit_expression_type_c |
|
387 |