--- 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 <http://www.gnu.org/licenses/>.
- *
- *
- * 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
-