diff -r aad38592bdde -r c0bda77b37a0 stage3/visit_expression_type.hh --- a/stage3/visit_expression_type.hh Tue Aug 14 19:40:01 2012 +0200 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,393 +0,0 @@ -/* - * matiec - a compiler for the programming languages defined in IEC 61131-3 - * - * Copyright (C) 2009-2011 Mario de Sousa (msousa@fe.up.pt) - * Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see . - * - * - * This code is made available on the understanding that it will not be - * used in safety-critical situations without a full and competent review. - */ - -/* - * An IEC 61131-3 compiler. - * - * Based on the - * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) - * - */ - -/* Verify whether the semantic rules of data type compatibility are being followed. - * - * For example: - */ - -#include "../absyntax_utils/absyntax_utils.hh" - -class visit_expression_type_c: public search_constant_type_c { - - private: - search_varfb_instance_type_c *search_varfb_instance_type; - search_base_type_c search_base_type; - - /* When calling a function block, we must first find it's type, - * by searching through the declarations of the variables currently - * in scope. - * This class does just that... - * A new bject instance is instantiated whenever we start checking semantics - * for a function block type declaration, or a program declaration. - * This object instance will then later be called while the - * function block's or the program's body is being handled. - * - * Note that functions cannot contain calls to function blocks, - * so we do not create an object instance when handling - * a function declaration. - */ -// search_var_instance_decl_c *search_var_instance_decl; - - /* This variable was created to pass information from - * visit_expression_type_c::visit(case_statement_c *symbol) function to - * visit_expression_type_c::visit(case_list_c *symbol) function. - */ - symbol_c *case_expression_type; - - /* In IL code, once we find a type mismatch error, it is best to - * ignore any further errors until the end of the logicl operation, - * i.e. until the next LD. - * However, we cannot clear the il_error flag on all LD operations, - * as these may also be used within parenthesis. LD operations - * within parenthesis may not clear the error flag. - * We therefore need a counter to know how deep inside a parenthesis - * structure we are. - */ - int il_parenthesis_level; - bool il_error; - bool error_found; - - /* the current data type of the data stored in the IL stack, i.e. the default variable */ - symbol_c *il_default_variable_type; - /* the current IL operand being analysed - its symbol and its data type */ - symbol_c *il_operand_type; - symbol_c *il_operand; - - - public: - visit_expression_type_c(symbol_c *ignore); - virtual ~visit_expression_type_c(void); - - bool get_error_found(void); - - typedef struct { - symbol_c *value; - symbol_c *type; - } value_and_type_t; - - /* A helper function... */ - bool is_ANY_ELEMENTARY_type (symbol_c *type_symbol); - bool is_ANY_SAFEELEMENTARY_type (symbol_c *type_symbol); - bool is_ANY_ELEMENTARY_compatible (symbol_c *type_symbol); - - bool is_ANY_MAGNITUDE_type (symbol_c *type_symbol); - bool is_ANY_SAFEMAGNITUDE_type (symbol_c *type_symbol); - bool is_ANY_MAGNITUDE_compatible (symbol_c *type_symbol); - - bool is_ANY_DATE_type (symbol_c *type_symbol); - bool is_ANY_SAFEDATE_type (symbol_c *type_symbol); - bool is_ANY_DATE_compatible (symbol_c *type_symbol); - - bool is_ANY_STRING_type (symbol_c *type_symbol); - bool is_ANY_SAFESTRING_type (symbol_c *type_symbol); - bool is_ANY_STRING_compatible (symbol_c *type_symbol); - - bool is_ANY_INT_type (symbol_c *type_symbol); - bool is_ANY_SAFEINT_type (symbol_c *type_symbol); - bool is_ANY_INT_compatible (symbol_c *type_symbol); - - bool is_ANY_REAL_type (symbol_c *type_symbol); - bool is_ANY_SAFEREAL_type (symbol_c *type_symbol); - bool is_ANY_REAL_compatible (symbol_c *type_symbol); - - bool is_ANY_NUM_type (symbol_c *type_symbol); - bool is_ANY_SAFENUM_type (symbol_c *type_symbol); - bool is_ANY_NUM_compatible (symbol_c *type_symbol); - - bool is_ANY_BIT_type (symbol_c *type_symbol); - bool is_ANY_SAFEBIT_type (symbol_c *type_symbol); - bool is_ANY_BIT_compatible (symbol_c *type_symbol); - - bool is_BOOL_type (symbol_c *type_symbol); - bool is_SAFEBOOL_type (symbol_c *type_symbol); - bool is_ANY_BOOL_compatible (symbol_c *type_symbol); - - bool is_nonneg_literal_integer_type (symbol_c *type_symbol); - bool is_literal_integer_type (symbol_c *type_symbol); - bool is_literal_real_type (symbol_c *type_symbol); - bool is_literal_bool_type (symbol_c *type_symbol); - - bool is_ANY_ELEMENTARY_OR_ENUMERATED_compatible (symbol_c *type_symbol); - - /* Determine the common data type between two data types. - * If no common data type found, return NULL. - * - * If data types are identical, return the first (any would do...). - * If any of the datat types is a literal, we confirm that - * the literal uses less bits than the fixed size data type. - * e.g. BYTE and 1024 returns NULL - * BYTE and 255 returns BYTE - * - * If two literals, then return the literal that requires more bits... - */ - symbol_c *common_type__(symbol_c *first_type, symbol_c *second_type); - /* Determine the common data type between two data types. - * Unlike the common_type__() function, we stop the compiler with an ERROR - * if no common data type is found. - */ - symbol_c *common_type(symbol_c *first_type, symbol_c *second_type); - - symbol_c *common_literal(symbol_c *first_type, symbol_c *second_type); - symbol_c *overloaded_return_type(symbol_c *type); - -/* Return TRUE if the second (value) data type may be assigned to a variable of the first (variable) data type - * such as: - * var_type value_type - * BOOL BYTE#7 -> returns false - * INT INT#7 -> returns true - * INT 7 -> returns true - * REAL 7.89 -> returns true - * REAL 7 -> returns true - * INT 7.89 -> returns false - * SAFEBOOL BOOL#1 -> returns false !!! - * etc... - * - * NOTE: It is assumed that the var_type is the data type of an lvalue - */ - bool is_valid_assignment(symbol_c *var_type, symbol_c *value_type); - -/* Return TRUE if there is a common data type, otherwise return FALSE - * i.e., return TRUE if both data types may be used simultaneously in an expression - * such as: - * BOOL#0 AND BYTE#7 -> returns false - * 0 AND BYTE#7 -> returns true - * INT#10 AND INT#7 -> returns true - * INT#10 AND 7 -> returns true - * REAL#34.3 AND 7.89 -> returns true - * REAL#34.3 AND 7 -> returns true - * INT#10 AND 7.89 -> returns false - * SAFEBOOL#0 AND BOOL#1 -> returns true !!! - * etc... - */ - bool is_compatible_type(symbol_c *first_type, symbol_c *second_type); - - /* check semantics of FB call in the IL language using input operators */ - /* e.g. CU, CLK, IN, PT, SR, ... */ - void check_il_fbcall(symbol_c *symbol, const char *input_operator); - /* check the semantics of a FB or Function non-formal call */ - /* e.g. foo(1, 2, 3, 4); */ - /* If error_count pointer is NULL, print out error messages. - * If error_count pointer is != NULL, do not print out error messages, but tally up - * how many errors were found. - */ - void check_nonformal_call(symbol_c *f_call, symbol_c *f_decl, bool use_il_defvar = false, int *error_count = NULL); - /* check the semantics of a FB or Function formal call */ - /* e.g. foo(IN1 := 1, OUT1 =>x, EN := true); */ - /* If error_count pointer is NULL, print out error messages. - * If error_count pointer is != NULL, do not print out error messages, but tally up - * how many errors were found. - */ - void check_formal_call(symbol_c *f_call, symbol_c *f_decl, int *error_count = NULL); - - - void *compute_standard_function_default(function_invocation_c *st_symbol, il_formal_funct_call_c *il_symbol); - void *compute_standard_function_il(il_function_call_c *symbol, symbol_c *param_data_type); - - - /* A helper function... */ - typedef bool (visit_expression_type_c::*is_data_type_t)(symbol_c *type_symbol); /* a pointer to a function! */ -// symbol_c *compute_boolean_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type); -// symbol_c *compute_numeric_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type); -// symbol_c *compute_expression(symbol_c *left_exp, symbol_c *right_exp, is_data_type_t is_data_type); - symbol_c *compute_expression(symbol_c *left_type, symbol_c *right_type, is_data_type_t is_data_type, - symbol_c *left_expr, symbol_c *right_expr); - - - /* a helper function... */ - symbol_c *base_type(symbol_c *symbol); - - /* a helper function... */ - void *verify_null(symbol_c *symbol); - - /********************************/ - /* B 1.3.3 - Derived data types */ - /********************************/ - void *visit(data_type_declaration_c *symbol); - - /*********************/ - /* B 1.4 - Variables */ - /*********************/ - void *visit(symbolic_variable_c *symbol); - - /********************************************/ - /* B 1.4.1 - Directly Represented Variables */ - /********************************************/ - void *visit(direct_variable_c *symbol); - - /*************************************/ - /* B 1.4.2 - Multi-element variables */ - /*************************************/ - - void *visit(array_variable_c *symbol); - void *visit(structured_variable_c *symbol); - - /********************************/ - /* B 1.7 Configuration elements */ - /********************************/ - void *visit(configuration_declaration_c *symbol); - -/****************************************/ - /* B.2 - Language IL (Instruction List) */ - /****************************************/ - /***********************************/ - /* B 2.1 Instructions and Operands */ - /***********************************/ - // void *visit(instruction_list_c *symbol); - void *visit(il_simple_operation_c *symbol); - void *visit(il_function_call_c *symbol); - void *visit(il_expression_c *symbol); -// void *visit(il_jump_operation_c *symbol); - void *visit(il_fb_call_c *symbol); - void *visit(il_formal_funct_call_c *symbol); - /* - void *visit(il_operand_list_c *symbol); - void *visit(simple_instr_list_c *symbol); - void *visit(il_param_list_c *symbol); - void *visit(il_param_assignment_c *symbol); - void *visit(il_param_out_assignment_c *symbol); - */ - - /*******************/ - /* B 2.2 Operators */ - /*******************/ - void *visit(LD_operator_c *symbol); - void *visit(LDN_operator_c *symbol); - void *visit(ST_operator_c *symbol); - void *visit(STN_operator_c *symbol); - void *visit(NOT_operator_c *symbol); - void *visit(S_operator_c *symbol); - void *visit(R_operator_c *symbol); - void *visit(S1_operator_c *symbol); - void *visit(R1_operator_c *symbol); - void *visit(CLK_operator_c *symbol); - void *visit(CU_operator_c *symbol); - void *visit(CD_operator_c *symbol); - void *visit(PV_operator_c *symbol); - void *visit(IN_operator_c *symbol); - void *visit(PT_operator_c *symbol); - void *visit(AND_operator_c *symbol); - void *visit(OR_operator_c *symbol); - void *visit(XOR_operator_c *symbol); - void *visit(ANDN_operator_c *symbol); - void *visit(ORN_operator_c *symbol); - void *visit(XORN_operator_c *symbol); - void *visit(ADD_operator_c *symbol); - void *visit(SUB_operator_c *symbol); - void *visit(MUL_operator_c *symbol); - void *visit(DIV_operator_c *symbol); - void *visit(MOD_operator_c *symbol); - void *visit(GT_operator_c *symbol); - void *visit(GE_operator_c *symbol); - void *visit(EQ_operator_c *symbol); - void *visit(LT_operator_c *symbol); - void *visit(LE_operator_c *symbol); - void *visit(NE_operator_c *symbol); - void *visit(CAL_operator_c *symbol); - void *visit(CALC_operator_c *symbol); - void *visit(CALCN_operator_c *symbol); - void *visit(RET_operator_c *symbol); - void *visit(RETC_operator_c *symbol); - void *visit(RETCN_operator_c *symbol); - void *visit(JMP_operator_c *symbol); - void *visit(JMPC_operator_c *symbol); - void *visit(JMPCN_operator_c *symbol); - /* Symbol class handled together with function call checks */ - // void *visit(il_assign_operator_c *symbol, variable_name); - /* Symbol class handled together with function call checks */ - // void *visit(il_assign_operator_c *symbol, option, variable_name); - - - - /***************************************/ - /* B.3 - Language ST (Structured Text) */ - /***************************************/ - /***********************/ - /* B 3.1 - Expressions */ - /***********************/ - void *visit(or_expression_c *symbol); - void *visit(xor_expression_c *symbol); - void *visit(and_expression_c *symbol); - void *visit(equ_expression_c *symbol); - void *visit(notequ_expression_c *symbol); - void *visit(lt_expression_c *symbol); - void *visit(gt_expression_c *symbol); - void *visit(le_expression_c *symbol); - void *visit(ge_expression_c *symbol); - void *visit(add_expression_c *symbol); - void *visit(sub_expression_c *symbol); - void *visit(mul_expression_c *symbol); - void *visit(div_expression_c *symbol); - void *visit(mod_expression_c *symbol); - void *visit(power_expression_c *symbol); - void *visit(neg_expression_c *symbol); - void *visit(not_expression_c *symbol); - void *visit(function_invocation_c *symbol); - - /*********************************/ - /* B 3.2.1 Assignment Statements */ - /*********************************/ - void *visit(assignment_statement_c *symbol); - - /*****************************************/ - /* B 3.2.2 Subprogram Control Statements */ - /*****************************************/ - void *visit(fb_invocation_c *symbol); - - /********************************/ - /* B 3.2.3 Selection Statements */ - /********************************/ - - void *visit(if_statement_c *symbol); -// void *visit(elseif_statement_list_c *symbol); - void *visit(elseif_statement_c *symbol); - void *visit(case_statement_c *symbol); -// void *visit(case_element_list_c *symbol); -// void *visit(case_element_c *symbol); - void *visit(case_list_c *symbol); - - /********************************/ - /* B 3.2.4 Iteration Statements */ - /********************************/ - - void *visit(for_statement_c *symbol); - void *visit(while_statement_c *symbol); - void *visit(repeat_statement_c *symbol); - - -//TODO: delete this functions. Why are they needed? -void *visit(program_declaration_c *symbol); -void *visit(function_declaration_c *symbol); -void *visit(function_block_declaration_c *symbol); - -}; // visit_expression_type_c -