--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/narrow_candidate_datatypes.hh Wed Aug 22 16:46:17 2012 +0200
@@ -0,0 +1,270 @@
+/*
+ * matiec - a compiler for the programming languages defined in IEC 61131-3
+ *
+ * Copyright (C) 2009-2012 Mario de Sousa (msousa@fe.up.pt)
+ * Copyright (C) 2012 Manuele Conti (manuele.conti@sirius-es.it)
+ * Copyright (C) 2012 Matteo Facchinetti (matteo.facchinetti@sirius-es.it)
+ *
+ *
+ * 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)
+ *
+ */
+
+
+/* NOTE: The algorithm implemented here assumes that candidate datatype lists have already been filled!
+ * BEFORE running this visitor, be sure to CALL the fill_candidate_datatype_c visitor!
+ */
+
+
+/*
+ * Choose, from the list of all the possible datatypes each expression may take, the single datatype that it will in fact take.
+ * The resulting (chosen) datatype, will be stored in the symbol_c.datatype variable, leaving the candidate datatype list untouched!
+ *
+ * For rvalue expressions, this decision will be based on the datatype of the lvalue expression.
+ * For lvalue expressions, the candidate datatype list should have a single entry.
+ *
+ * For example, the very simple literal '0' in 'foo := 0', may represent a:
+ * BOOL, BYTE, WORD, DWORD, LWORD, USINT, SINT, UINT, INT, UDINT, DINT, ULINT, LINT (as well as the SAFE versions of these data tyes too!)
+ *
+ * In this class, the datatype of '0' will be set to the same datatype as the 'foo' variable.
+ * If the intersection of the candidate datatype lists of the left and right side expressions is empty,
+ * then a datatype error has been found, and the datatype is either left at NULL, or set to a pointer of an invalid_type_name_c object!
+ */
+
+
+#include "../absyntax_utils/absyntax_utils.hh"
+#include "datatype_functions.hh"
+
+class narrow_candidate_datatypes_c: public iterator_visitor_c {
+
+ private:
+ search_varfb_instance_type_c *search_varfb_instance_type;
+ search_base_type_c search_base_type;
+ symbol_c *il_operand;
+ il_instruction_c *fake_prev_il_instruction;
+ std::vector <symbol_c *> *prev_il_instructions;
+ std::vector <symbol_c *> *prev_il_instructions_intersected_datatypes;
+
+ bool is_widening_compatible(const struct widen_entry widen_table[], symbol_c *left_type, symbol_c *right_type, symbol_c *result_type, bool *deprecated_status = NULL);
+
+ void narrow_function_invocation(symbol_c *f_call, generic_function_call_t fcall_data);
+ void narrow_nonformal_call(symbol_c *f_call, symbol_c *f_decl, int *ext_parm_count = NULL);
+ void narrow_formal_call(symbol_c *f_call, symbol_c *f_decl, int *ext_parm_count = NULL);
+ void *narrow_implicit_il_fb_call(symbol_c *il_instruction, const char *param_name, symbol_c *&called_fb_declaration);
+
+ void *handle_il_instruction(symbol_c *symbol);
+ void *narrow_binary_operator (const struct widen_entry widen_table[], symbol_c *symbol, bool *deprecated_operation = NULL);
+ void *narrow_binary_expression(const struct widen_entry widen_table[], symbol_c *symbol, symbol_c *l_expr, symbol_c *r_expr, bool *deprecated_operation = NULL);
+
+ void *narrow_conditional_flow_control_IL_instruction(symbol_c *symbol);
+
+
+ public:
+ narrow_candidate_datatypes_c(symbol_c *ignore);
+ virtual ~narrow_candidate_datatypes_c(void);
+
+ symbol_c *base_type(symbol_c *symbol);
+
+ /**********************/
+ /* B 1.3 - Data types */
+ /**********************/
+ /********************************/
+ /* B 1.3.3 - Derived data types */
+ /********************************/
+ void *visit(subrange_c *symbol);
+ void *visit(simple_spec_init_c *symbol);
+
+ /*********************/
+ /* B 1.4 - Variables */
+ /*********************/
+ /********************************************/
+ /* B 1.4.1 - Directly Represented Variables */
+ /********************************************/
+ /*************************************/
+ /* B 1.4.2 - Multi-element variables */
+ /*************************************/
+ void *visit(array_variable_c *symbol);
+ void *visit(subscript_list_c *symbol);
+
+ /******************************************/
+ /* B 1.4.3 - Declaration & Initialisation */
+ /******************************************/
+ void *visit(var1_list_c *symbol);
+ void *visit(location_c *symbol);
+ void *visit(located_var_decl_c *symbol);
+
+ /**************************************/
+ /* B 1.5 - Program organization units */
+ /**************************************/
+ /***********************/
+ /* B 1.5.1 - Functions */
+ /***********************/
+ void *visit(function_declaration_c *symbol);
+
+ /*****************************/
+ /* B 1.5.2 - Function blocks */
+ /*****************************/
+ void *visit(function_block_declaration_c *symbol);
+
+ /**********************/
+ /* B 1.5.3 - Programs */
+ /**********************/
+ void *visit(program_declaration_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_instruction_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_simple_instruction_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_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);
+
+}; // narrow_candidate_datatypes_c
+
+
+
+
+
+
+
+