diff -r 41cb5b80416e -r e1f0ebd2d9ec stage4/generate_c/generate_c_typedecl.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/generate_c/generate_c_typedecl.cc	Wed Oct 24 17:39:51 2007 +0200
@@ -0,0 +1,467 @@
+/*
+ * (c) 2003 Mario de Sousa
+ *
+ * Offered to the public under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2 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.
+ *
+ * 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 IL and ST compiler.
+ *
+ * Based on the
+ * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
+ *
+ */
+
+
+/*
+ * Conversion of type declaration constructs.
+ *
+ * This is part of the 4th stage that generates
+ * a c++ source program equivalent to the IL and ST
+ * code.
+ */
+
+
+
+
+
+
+//#include <stdio.h>  /* required for NULL */
+//#include <string>
+//#include <iostream>
+
+//#include "../../util/symtable.hh"
+
+
+
+
+
+class generate_c_typedecl_c: public generate_c_base_c {
+
+  public:
+    generate_c_typedecl_c(stage4out_c *s4o_ptr): generate_c_base_c(s4o_ptr) {}
+    ~generate_c_typedecl_c(void) {}
+
+
+/***************************/
+/* B 0 - Programming Model */
+/***************************/
+  /* leave for derived classes... */
+
+/*************************/
+/* B.1 - Common elements */
+/*************************/
+/*******************************************/
+/* B 1.1 - Letters, digits and identifiers */
+/*******************************************/
+  /* done in base class(es) */
+
+/*********************/
+/* B 1.2 - Constants */
+/*********************/
+  /* originally empty... */
+
+/******************************/
+/* B 1.2.1 - Numeric Literals */
+/******************************/
+  /* done in base class(es) */
+
+/*******************************/
+/* B.1.2.2   Character Strings */
+/*******************************/
+  /* done in base class(es) */
+
+/***************************/
+/* B 1.2.3 - Time Literals */
+/***************************/
+/************************/
+/* B 1.2.3.1 - Duration */
+/************************/
+  /* done in base class(es) */
+
+/************************************/
+/* B 1.2.3.2 - Time of day and Date */
+/************************************/
+  /* done in base class(es) */
+
+/**********************/
+/* B.1.3 - Data types */
+/**********************/
+/***********************************/
+/* B 1.3.1 - Elementary Data Types */
+/***********************************/
+  /* done in base class(es) */
+
+/********************************/
+/* B.1.3.2 - Generic data types */
+/********************************/
+  /* originally empty... */
+
+/********************************/
+/* B 1.3.3 - Derived data types */
+/********************************/
+void *visit(subrange_spec_init_c *symbol) {
+  TRACE("subrange_spec_init_c");
+  // TODO...
+  ERROR;
+  return NULL;
+}
+
+void *visit(enumerated_spec_init_c *symbol) {
+  TRACE("enumerated_spec_init_c");
+  // TODO...
+  ERROR;
+  return NULL;
+}
+
+/*  TYPE type_declaration_list END_TYPE */
+void *visit(data_type_declaration_c *symbol) {
+  TRACE("data_type_declaration_c");
+  symbol->type_declaration_list->accept(*this);
+  s4o.print("\n\n");
+  return NULL;
+}
+
+/* helper symbol for data_type_declaration */
+void *visit(type_declaration_list_c *symbol) {
+  TRACE("type_declaration_list_c");
+  return print_list(symbol);
+}
+
+/*  simple_type_name ':' simple_spec_init */
+void *visit(simple_type_declaration_c *symbol) {
+  TRACE("simple_type_declaration_c");
+  /* add this type declaration to the type symbol table... */
+  type_symtable.insert(symbol->simple_type_name, symbol->simple_spec_init);
+
+  s4o.print("typedef ");
+  symbol->simple_spec_init->accept(*this);
+  s4o.print(" ");
+  symbol->simple_type_name->accept(*this);
+  s4o.print(";\n");
+  return NULL;
+}
+
+/* simple_specification [ASSIGN constant] */
+//SYM_REF2(simple_spec_init_c, simple_specification, constant)
+// <constant> may be NULL
+void *visit(simple_spec_init_c *symbol) {
+  TRACE("simple_spec_init_c");
+  symbol->simple_specification->accept(*this);
+  return NULL;
+}
+
+#if 0
+/*  subrange_type_name ':' subrange_spec_init */
+SYM_REF2(subrange_type_declaration_c, subrange_type_name, subrange_spec_init)
+
+/* subrange_specification ASSIGN signed_integer */
+SYM_REF2(subrange_spec_init_c, subrange_specification, signed_integer)
+
+/*  integer_type_name '(' subrange')' */
+SYM_REF2(subrange_specification_c, integer_type_name, subrange)
+
+/*  signed_integer DOTDOT signed_integer */
+SYM_REF2(subrange_c, lower_limit, upper_limit)
+
+/*  enumerated_type_name ':' enumerated_spec_init */
+SYM_REF2(enumerated_type_declaration_c, enumerated_type_name, enumerated_spec_init)
+
+/* enumerated_specification ASSIGN enumerated_value */
+SYM_REF2(enumerated_spec_init_c, enumerated_specification, enumerated_value)
+
+/* helper symbol for enumerated_specification->enumerated_spec_init */
+/* enumerated_value_list ',' enumerated_value */
+SYM_LIST(enumerated_value_list_c)
+
+/* enumerated_type_name '#' identifier */
+SYM_REF2(enumerated_value_c, type, value)
+
+/*  identifier ':' array_spec_init */
+SYM_REF2(array_type_declaration_c, identifier, array_spec_init)
+
+/* array_specification [ASSIGN array_initialization} */
+/* array_initialization may be NULL ! */
+SYM_REF2(array_spec_init_c, array_specification, array_initialization)
+
+/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
+SYM_REF2(array_specification_c, array_subrange_list, non_generic_type_name)
+
+/* helper symbol for array_specification */
+/* array_subrange_list ',' subrange */
+SYM_LIST(array_subrange_list_c)
+
+/* array_initialization:  '[' array_initial_elements_list ']' */
+/* helper symbol for array_initialization */
+/* array_initial_elements_list ',' array_initial_elements */
+SYM_LIST(array_initial_elements_list_c)
+
+/* integer '(' [array_initial_element] ')' */
+/* array_initial_element may be NULL ! */
+SYM_REF2(array_initial_elements_c, integer, array_initial_element)
+#endif
+
+/*  structure_type_name ':' structure_specification */
+//SYM_REF2(structure_type_declaration_c, structure_type_name, structure_specification)
+void *visit(structure_type_declaration_c *symbol) {
+  TRACE("structure_type_declaration_c");
+  /* add this type declaration to the type symbol table... */
+  type_symtable.insert(symbol->structure_type_name, symbol->structure_specification);
+
+  s4o.print("typedef ");
+  symbol->structure_specification->accept(*this);
+  s4o.print(" ");
+  symbol->structure_type_name->accept(*this);
+  s4o.print(";\n");
+  return NULL;
+}
+
+/* structure_type_name ASSIGN structure_initialization */
+/* structure_initialization may be NULL ! */
+//SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
+void *visit(initialized_structure_c *symbol) {
+  TRACE("initialized_structure_c");
+  symbol->structure_type_name->accept(*this);
+  return NULL;
+}
+
+/* helper symbol for structure_declaration */
+/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
+/* structure_element_declaration_list structure_element_declaration ';' */
+//SYM_LIST(structure_element_declaration_list_c)
+void *visit(structure_element_declaration_list_c *symbol) {
+  TRACE("structure_element_declaration_list_c");
+  s4o.print("struct {\n");
+  s4o.indent_right();
+  s4o.print(s4o.indent_spaces);
+
+  print_list(symbol);
+
+  s4o.indent_left();
+  s4o.print(s4o.indent_spaces);
+  s4o.print("}");
+  return NULL;
+}
+
+/*  structure_element_name ':' spec_init */
+//SYM_REF2(structure_element_declaration_c, structure_element_name, spec_init)
+void *visit(structure_element_declaration_c *symbol) {
+  TRACE("structure_element_declaration_c");
+
+  symbol->spec_init->accept(*this);
+  s4o.print(" ");
+  symbol->structure_element_name->accept(*this);
+  s4o.print(";\n");
+  s4o.print(s4o.indent_spaces);
+
+  return NULL;
+}
+
+/* helper symbol for structure_initialization */
+/* structure_initialization: '(' structure_element_initialization_list ')' */
+/* structure_element_initialization_list ',' structure_element_initialization */
+//SYM_LIST(structure_element_initialization_list_c)
+void *visit(structure_element_initialization_list_c *symbol) {
+  TRACE("structure_element_initialization_list_c");
+
+  // TODO ???
+  ERROR;
+  return NULL;
+}
+
+/*  structure_element_name ASSIGN value */
+//SYM_REF2(structure_element_initialization_c, structure_element_name, value)
+void *visit(structure_element_initialization_c *symbol) {
+  TRACE("structure_element_initialization_c");
+
+  // TODO ???
+  ERROR;
+  return NULL;
+}
+
+#if 0
+/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
+/*
+ * NOTE:
+ * (Summary: Contrary to what is expected, the
+ *           string_type_declaration_c is not used to store
+ *           simple string type declarations that do not include
+ *           size limits.
+ *           For e.g.:
+ *             str1_type: STRING := "hello!"
+ *           will be stored in a simple_type_declaration_c
+ *           instead of a string_type_declaration_c.
+ *           The following:
+ *             str2_type: STRING [64] := "hello!"
+ *           will be stored in a sring_type_declaration_c
+ *
+ *           Read on for why this is done...
+ * End Summary)
+ *
+ * According to the spec, the valid construct
+ * TYPE new_str_type : STRING := "hello!"; END_TYPE
+ * has two possible routes to type_declaration...
+ *
+ * Route 1:
+ * type_declaration: single_element_type_declaration
+ * single_element_type_declaration: simple_type_declaration
+ * simple_type_declaration: identifier ':' simple_spec_init
+ * simple_spec_init: simple_specification ASSIGN constant
+ * (shift:  identifier <- 'new_str_type')
+ * simple_specification: elementary_type_name
+ * elementary_type_name: STRING
+ * (shift: elementary_type_name <- STRING)
+ * (reduce: simple_specification <- elementary_type_name)
+ * (shift: constant <- "hello!")
+ * (reduce: simple_spec_init: simple_specification ASSIGN constant)
+ * (reduce: ...)
+ *
+ *
+ * Route 2:
+ * type_declaration: string_type_declaration
+ * string_type_declaration: identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init
+ * (shift:  identifier <- 'new_str_type')
+ * elementary_string_type_name: STRING
+ * (shift: elementary_string_type_name <- STRING)
+ * (shift: string_type_declaration_size <-  empty )
+ * string_type_declaration_init: ASSIGN character_string
+ * (shift: character_string <- "hello!")
+ * (reduce: string_type_declaration_init <- ASSIGN character_string)
+ * (reduce: string_type_declaration <- identifier ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init )
+ * (reduce: type_declaration <- string_type_declaration)
+ *
+ *
+ * At first glance it seems that removing route 1 would make
+ * the most sense. Unfortunately the construct 'simple_spec_init'
+ * shows up multiple times in other rules, so changing this construct
+ * would also mean changing all the rules in which it appears.
+ * I (Mario) therefore chose to remove route 2 instead. This means
+ * that the above declaration gets stored in a
+ * simple_type_declaration_c, and not in a string_type_declaration_c
+ * as would be expected!
+ */
+/*  string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */
+SYM_REF4(string_type_declaration_c,	string_type_name,
+					elementary_string_type_name,
+					string_type_declaration_size,
+					string_type_declaration_init) /* may be == NULL! */
+#endif
+
+/*********************/
+/* B 1.4 - Variables */
+/*********************/
+  /* done in base class(es) */
+
+/********************************************/
+/* B.1.4.1   Directly Represented Variables */
+/********************************************/
+// direct_variable: direct_variable_token	{$$ = new direct_variable_c($1);};
+void *visit(direct_variable_c *symbol) {
+  TRACE("direct_variable_c");
+  /* Do not use print_token() as it will change everything into uppercase */
+  if (strlen(symbol->value) == 0) ERROR;
+  return s4o.printlocation(symbol->value + 1);
+}
+
+
+/*************************************/
+/* B.1.4.2   Multi-element Variables */
+/*************************************/
+  /* done in base class(es) */
+
+/******************************************/
+/* B 1.4.3 - Declaration & Initialisation */
+/******************************************/
+  /* leave for derived classes... */
+
+/**************************************/
+/* B.1.5 - Program organization units */
+/**************************************/
+/***********************/
+/* B 1.5.1 - Functions */
+/***********************/
+  /* leave for derived classes... */
+
+/*****************************/
+/* B 1.5.2 - Function Blocks */
+/*****************************/
+  /* leave for derived classes... */
+
+/**********************/
+/* B 1.5.3 - Programs */
+/**********************/
+  /* leave for derived classes... */
+
+/*********************************************/
+/* B.1.6  Sequential function chart elements */
+/*********************************************/
+
+/********************************/
+/* B 1.7 Configuration elements */
+/********************************/
+  /* leave for derived classes... */
+
+/****************************************/
+/* B.2 - Language IL (Instruction List) */
+/****************************************/
+/***********************************/
+/* B 2.1 Instructions and Operands */
+/***********************************/
+  /* leave for derived classes... */
+
+/*******************/
+/* B 2.2 Operators */
+/*******************/
+  /* leave for derived classes... */
+
+
+/***************************************/
+/* B.3 - Language ST (Structured Text) */
+/***************************************/
+/***********************/
+/* B 3.1 - Expressions */
+/***********************/
+  /* leave for derived classes... */
+
+/********************/
+/* B 3.2 Statements */
+/********************/
+  /* leave for derived classes... */
+
+/*********************************/
+/* B 3.2.1 Assignment Statements */
+/*********************************/
+  /* leave for derived classes... */
+
+/*****************************************/
+/* B 3.2.2 Subprogram Control Statements */
+/*****************************************/
+  /* leave for derived classes... */
+
+/********************************/
+/* B 3.2.3 Selection Statements */
+/********************************/
+  /* leave for derived classes... */
+
+/********************************/
+/* B 3.2.4 Iteration Statements */
+/********************************/
+  /* leave for derived classes... */
+
+
+
+
+}; /* generate_c_typedecl_c */
+
+
+