diff -r aad38592bdde -r c0bda77b37a0 stage3/constant_folding.hh
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/stage3/constant_folding.hh Wed Aug 22 16:46:17 2012 +0200
@@ -0,0 +1,179 @@
+/*
+ * 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 (conti.ma@alice.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 .
+ *
+ *
+ * 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)
+ *
+ */
+
+/* Determine the data type of an constant expression.
+ * A reference to the relevant type definition is returned.
+ *
+ * For example:
+ * 2 + 3 -> returns reference
+ * 22.2 - 5 -> returns reference
+ * etc...
+ */
+
+#include
+#include "../absyntax_utils/absyntax_utils.hh"
+
+
+
+class constant_folding_c : public iterator_visitor_c {
+ private:
+ search_varfb_instance_type_c *search_varfb_instance_type;
+ search_base_type_c search_base_type;
+ int error_count;
+ bool warning_found;
+ int current_display_error_level;
+ /* Pointer to the previous IL instruction, which contains the current cvalue of the data stored in the IL stack, i.e. the default variable, a.k.a. accumulator */
+ symbol_c *prev_il_instruction;
+ /* the current IL operand being analyzed */
+ symbol_c *il_operand;
+
+ public:
+ constant_folding_c(symbol_c *symbol = NULL);
+ virtual ~constant_folding_c(void);
+ int get_error_count();
+
+ private:
+ /*********************/
+ /* B 1.2 - Constants */
+ /*********************/
+ /******************************/
+ /* B 1.2.1 - Numeric Literals */
+ /******************************/
+ void *visit(real_c *symbol);
+ void *visit(integer_c *symbol);
+ void *visit(neg_real_c *symbol);
+ void *visit(neg_integer_c *symbol);
+ void *visit(binary_integer_c *symbol);
+ void *visit(octal_integer_c *symbol);
+ void *visit(hex_integer_c *symbol);
+ void *visit(integer_literal_c *symbol);
+ void *visit(real_literal_c *symbol);
+ void *visit(bit_string_literal_c *symbol);
+ void *visit(boolean_literal_c *symbol);
+ void *visit(boolean_true_c *symbol);
+ void *visit(boolean_false_c *symbol);
+
+ /****************************************/
+ /* B.2 - Language IL (Instruction List) */
+ /****************************************/
+ /***********************************/
+ /* B 2.1 Instructions and Operands */
+ /***********************************/
+ // void *visit(instruction_list_c *symbol); /* Not needed, since we inherit from iterator_visitor_c */
+ void *visit(il_instruction_c *symbol);
+ void *visit(il_simple_operation_c *symbol);
+ //void *visit(il_function_call_c *symbol); /* TODO */
+ 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); /* TODO */
+ //void *visit(il_operand_list_c *symbol); /* Not needed, since we inherit from iterator_visitor_c */
+ void *visit(simple_instr_list_c *symbol);
+ void *visit(il_simple_instruction_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); /* TODO */
+
+};
+