diff -r 64334c5a00b1 -r 38d6eb056260 absyntax_utils/search_base_type.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/absyntax_utils/search_base_type.cc	Mon Jun 01 21:08:44 2009 +0200
@@ -0,0 +1,235 @@
+/*
+ * (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)
+ *
+ */
+
+/* Determine the data type on which another data type is based on.
+ * If a new default initial value is given, we DO NOT consider it a
+ * new base class, and continue looking further!
+ *
+ * E.g. TYPE new_int_t : INT; END_TYPE;
+ *      TYPE new_int2_t : INT = 2; END_TYPE;
+ *      TYPE new_subr_t : INT (4..5); END_TYPE;
+ *
+ *    new_int_t is really an INT!!
+ *    new_int2_t is also really an INT!!
+ *    new_subr_t is also really an INT!!
+ */
+#include "absyntax_utils.hh"
+
+#define ERROR error_exit(__FILE__,__LINE__)
+/* function defined in main.cc */
+extern void error_exit(const char *file_name, int line_no);
+
+
+
+search_base_type_c::search_base_type_c(void) {current_type_name = NULL;}
+
+void *search_base_type_c::visit(identifier_c *type_name) {
+  this->current_type_name = type_name;
+  /* look up the type declaration... */
+  symbol_c *type_decl = type_symtable.find_value(type_name);
+  if (type_decl == type_symtable.end_value())
+    /* Type declaration not found!! */
+    ERROR;
+
+  return type_decl->accept(*this);
+}
+
+bool search_base_type_c::type_is_subrange(symbol_c* type_decl) {
+  this->is_subrange = false;
+  type_decl->accept(*this);
+  return this->is_subrange;
+}
+
+bool search_base_type_c::type_is_enumerated(symbol_c* type_decl) {
+  this->is_enumerated = false;
+  type_decl->accept(*this);
+  return this->is_enumerated;
+}
+
+/***********************************/
+/* B 1.3.1 - Elementary Data Types */
+/***********************************/
+void *search_base_type_c::visit(time_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(bool_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(sint_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(int_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(dint_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(lint_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(usint_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(uint_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(udint_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(ulint_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(real_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(lreal_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(date_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(tod_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(dt_type_name_c *symbol)		{return (void *)symbol;}
+void *search_base_type_c::visit(byte_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(word_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(dword_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(lword_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(string_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(wstring_type_name_c *symbol)	{return (void *)symbol;}
+void *search_base_type_c::visit(constant_int_type_name_c *symbol)    {return (void *)symbol;}
+void *search_base_type_c::visit(constant_real_type_name_c *symbol)    {return (void *)symbol;}
+void *search_base_type_c::visit(direct_variable_type_name_c *symbol)    {return (void *)symbol;}
+/******************************************************/
+/* Extensions to the base standard as defined in      */
+/* "Safety Software Technical Specification,          */
+/*  Part 1: Concepts and Function Blocks,             */
+/*  Version 1.0 – Official Release"                   */
+/* by PLCopen - Technical Committee 5 - 2006-01-31    */
+/******************************************************/
+void *search_base_type_c::visit(safebool_type_name_c *symbol)	{return (void *)symbol;}
+
+/********************************/
+/* B 1.3.3 - Derived data types */
+/********************************/
+/*  simple_type_name ':' simple_spec_init */
+void *search_base_type_c::visit(simple_type_declaration_c *symbol) {
+  return symbol->simple_spec_init->accept(*this);
+}
+/* simple_specification ASSIGN constant */
+void *search_base_type_c::visit(simple_spec_init_c *symbol) {
+  return symbol->simple_specification->accept(*this);
+}
+
+/*  subrange_type_name ':' subrange_spec_init */
+void *search_base_type_c::visit(subrange_type_declaration_c *symbol) {
+  return symbol->subrange_spec_init->accept(*this);
+}
+
+/* subrange_specification ASSIGN signed_integer */
+void *search_base_type_c::visit(subrange_spec_init_c *symbol) {
+  this->is_subrange = true;
+  return symbol->subrange_specification->accept(*this);
+}
+
+/*  integer_type_name '(' subrange')' */
+void *search_base_type_c::visit(subrange_specification_c *symbol) {
+  return symbol->integer_type_name->accept(*this);
+}
+
+/*  signed_integer DOTDOT signed_integer */
+void *search_base_type_c::visit(subrange_c *symbol) {ERROR; return NULL;} /* should never get called... */
+
+/*  enumerated_type_name ':' enumerated_spec_init */
+void *search_base_type_c::visit(enumerated_type_declaration_c *symbol) {
+  this->current_type_name = symbol->enumerated_type_name;
+  return symbol->enumerated_spec_init->accept(*this);
+}
+
+/* enumerated_specification ASSIGN enumerated_value */
+void *search_base_type_c::visit(enumerated_spec_init_c *symbol) {
+  this->is_enumerated = true;
+  return symbol->enumerated_specification->accept(*this);
+}
+
+/* helper symbol for enumerated_specification->enumerated_spec_init */
+/* enumerated_value_list ',' enumerated_value */
+void *search_base_type_c::visit(enumerated_value_list_c *symbol) {
+  if (NULL == this->current_type_name) ERROR;
+  return (void *)this->current_type_name;
+}
+
+/* enumerated_type_name '#' identifier */
+// SYM_REF2(enumerated_value_c, type, value)
+void *search_base_type_c::visit(enumerated_value_c *symbol) {ERROR; return NULL;} /* should never get called... */
+
+/*  identifier ':' array_spec_init */
+void *search_base_type_c::visit(array_type_declaration_c *symbol) {
+  this->current_type_name = symbol->identifier;
+  return symbol->array_spec_init->accept(*this);
+}
+
+/* array_specification [ASSIGN array_initialization} */
+/* array_initialization may be NULL ! */
+void *search_base_type_c::visit(array_spec_init_c *symbol) {
+  return symbol->array_specification->accept(*this);
+}
+
+/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
+void *search_base_type_c::visit(array_specification_c *symbol)	{
+  if (NULL == this->current_type_name) ERROR;
+  return symbol->non_generic_type_name->accept(*this);
+}
+
+/* helper symbol for array_specification */
+/* array_subrange_list ',' subrange */
+void *search_base_type_c::visit(array_subrange_list_c *symbol)	{ERROR; return NULL;} /* should never get called... */
+
+/* array_initialization:  '[' array_initial_elements_list ']' */
+/* helper symbol for array_initialization */
+/* array_initial_elements_list ',' array_initial_elements */
+void *search_base_type_c::visit(array_initial_elements_list_c *symbol)	{ERROR; return NULL;} /* should never get called... */
+
+/* integer '(' [array_initial_element] ')' */
+/* array_initial_element may be NULL ! */
+void *search_base_type_c::visit(array_initial_elements_c *symbol)	{ERROR; return NULL;} /* should never get called... */
+
+/*  structure_type_name ':' structure_specification */
+/* NOTE: structure_specification will point to either a
+ *       initialized_structure_c
+ *       OR A
+ *       structure_element_declaration_list_c
+ */
+void *search_base_type_c::visit(structure_type_declaration_c *symbol)  {
+  this->current_type_name = symbol->structure_type_name;
+  return symbol->structure_specification->accept(*this);
+}
+
+/* structure_type_name ASSIGN structure_initialization */
+/* structure_initialization may be NULL ! */
+void *search_base_type_c::visit(initialized_structure_c *symbol)	{
+  return symbol->structure_type_name->accept(*this);
+}
+
+/* helper symbol for structure_declaration */
+/* structure_declaration:  STRUCT structure_element_declaration_list END_STRUCT */
+/* structure_element_declaration_list structure_element_declaration ';' */
+void *search_base_type_c::visit(structure_element_declaration_list_c *symbol)	{
+  if (NULL == this->current_type_name) ERROR;
+  return (void *)symbol;
+}
+
+/*  structure_element_name ':' *_spec_init */
+void *search_base_type_c::visit(structure_element_declaration_c *symbol) {ERROR; return NULL;} /* should never get called... */
+
+/* helper symbol for structure_initialization */
+/* structure_initialization: '(' structure_element_initialization_list ')' */
+/* structure_element_initialization_list ',' structure_element_initialization */
+void *search_base_type_c::visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */
+
+/*  structure_element_name ASSIGN value */
+void *search_base_type_c::visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */
+
+/*  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!
+*/
+void *search_base_type_c::visit(string_type_declaration_c *symbol)	{return symbol;}
+