author | laurent |
Sun, 27 Mar 2011 15:55:51 +0200 | |
changeset 252 | 0bda13ec66b3 |
parent 238 | 0919986a5c98 |
child 265 | 4d222f46f8cc |
permissions | -rwxr-xr-x |
181 | 1 |
/* |
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* (c) 2003 Mario de Sousa |
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* |
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* Offered to the public under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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* |
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* This code is made available on the understanding that it will not be |
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* used in safety-critical situations without a full and competent review. |
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*/ |
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/* |
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* An IEC 61131-3 IL and ST compiler. |
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* |
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* Based on the |
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* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
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* |
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*/ |
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/* Determine the data type of a variable. |
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* The variable may be a simple variable, a function block instance, a |
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* struture element within a data structured type (a struct or a fb), or |
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* an array element. |
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* A mixture of array element of a structure element of a structure element |
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* of a .... is also suported! |
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* |
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* A reference to the relevant base type __definition__ is returned. |
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* This means that if we find that the variable is of type MY_INT, |
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* which was previously declared to be |
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* TYPE MY_INT: INT := 9; |
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* this class wil return INT, and __not__ MY_INT !! |
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* |
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* |
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* example: |
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* window.points[1].coordinate.x |
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* window.points[1].colour |
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* etc... ARE ALLOWED! |
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* |
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* This class must be passed the scope within which the |
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* variable was declared, and the variable name... |
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*/ |
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/* |
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* TODO: this code has a memory leak... |
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* We call 'new' in several locations, but bever get to 'delete' the object instances... |
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*/ |
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#include "absyntax_utils.hh" |
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search_varfb_instance_type_c::search_varfb_instance_type_c(symbol_c *search_scope): search_var_instance_decl(search_scope) { |
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this->decompose_var_instance_name = NULL; |
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this->current_structelement_name = NULL; |
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this->current_rawtype = NULL; |
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} |
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symbol_c *search_varfb_instance_type_c::get_type(symbol_c *variable_name) { |
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this->current_structelement_name = NULL; |
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this->current_rawtype = NULL; |
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this->decompose_var_instance_name = new decompose_var_instance_name_c(variable_name); |
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if (NULL == decompose_var_instance_name) ERROR; |
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/* find the part of the variable name that will appear in the |
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* variable declaration, for e.g., in window.point.x, this would be |
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* window! |
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*/ |
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symbol_c *var_name_part = decompose_var_instance_name->next_part(); |
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if (NULL == var_name_part) ERROR; |
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/* Now we try to find the variable instance declaration, to determine its type... */ |
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symbol_c *var_decl = search_var_instance_decl.get_decl(var_name_part); |
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if (NULL == var_decl) { |
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/* variable instance declaration not found! */ |
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ERROR; |
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} |
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/* if it is a struct or function block, we must search the type |
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* of the struct or function block member. |
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* This is done by this class visiting the var_decl. |
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* This class, while visiting, will recursively call |
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* decompose_var_instance_name->get_next() when and if required... |
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*/ |
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symbol_c *res = (symbol_c *)var_decl->accept(*this); |
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if (NULL == res) ERROR; |
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/* make sure that we have decomposed all structure elements of the variable name */ |
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symbol_c *var_name = decompose_var_instance_name->next_part(); |
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if (NULL != var_name) ERROR; |
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return res; |
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} |
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unsigned int search_varfb_instance_type_c::get_vartype(symbol_c *variable_name) { |
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this->current_structelement_name = NULL; |
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this->current_rawtype = NULL; |
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this->is_complex = false; |
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this->decompose_var_instance_name = new decompose_var_instance_name_c(variable_name); |
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if (NULL == decompose_var_instance_name) ERROR; |
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/* find the part of the variable name that will appear in the |
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* variable declaration, for e.g., in window.point.x, this would be |
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* window! |
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*/ |
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symbol_c *var_name_part = decompose_var_instance_name->next_part(); |
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if (NULL == var_name_part) ERROR; |
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/* Now we try to find the variable instance declaration, to determine its type... */ |
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symbol_c *var_decl = search_var_instance_decl.get_decl(var_name_part); |
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if (NULL == var_decl) { |
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/* variable instance declaration not found! */ |
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return 0; |
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} |
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/* if it is a struct or function block, we must search the type |
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* of the struct or function block member. |
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* This is done by this class visiting the var_decl. |
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* This class, while visiting, will recursively call |
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* decompose_var_instance_name->get_next() when and if required... |
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*/ |
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var_decl->accept(*this); |
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unsigned int res = search_var_instance_decl.get_vartype(); |
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/* make sure that we have decomposed all structure elements of the variable name */ |
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symbol_c *var_name = decompose_var_instance_name->next_part(); |
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if (NULL != var_name) ERROR; |
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return res; |
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} |
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symbol_c *search_varfb_instance_type_c::get_rawtype(symbol_c *variable_name) { |
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symbol_c *rawtype = this->get_type(variable_name); |
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if (this->current_rawtype != NULL) |
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return this->current_rawtype; |
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else |
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return rawtype; |
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} |
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bool search_varfb_instance_type_c::type_is_complex(void) { |
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return this->is_complex; |
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} |
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/* a helper function... */ |
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void *search_varfb_instance_type_c::visit_list(list_c *list) { |
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if (NULL == current_structelement_name) ERROR; |
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for(int i = 0; i < list->n; i++) { |
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void *res = list->elements[i]->accept(*this); |
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if (res != NULL) |
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return res; |
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} |
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/* not found! */ |
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return NULL; |
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} |
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/* a helper function... */ |
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void *search_varfb_instance_type_c::base_type(symbol_c *symbol) { |
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search_base_type_c search_base_type; |
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return symbol->accept(search_base_type); |
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} |
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/* We override the base class' visitor to identifier_c. |
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* This is so because the base class does not consider a function block |
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* to be a type, unlike this class that allows a variable instance |
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* of a function block type... |
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*/ |
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void *search_varfb_instance_type_c::visit(identifier_c *type_name) { |
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/* look up the type declaration... */ |
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symbol_c *fb_decl = function_block_type_symtable.find_value(type_name); |
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if (fb_decl != function_block_type_symtable.end_value()) |
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/* Type declaration found!! */ |
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return fb_decl->accept(*this); |
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this->current_rawtype = type_name; |
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/* No. It is not a function block, so we let |
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* the base class take care of it... |
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*/ |
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if (NULL == decompose_var_instance_name->next_part(false)) { |
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return base_type(type_name); |
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} |
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else { |
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return search_base_type_c::visit(type_name); |
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} |
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} |
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
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/* identifier ':' array_spec_init */ |
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void *search_varfb_instance_type_c::visit(array_type_declaration_c *symbol) { |
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this->is_complex = true; |
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return symbol->array_spec_init->accept(*this); |
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} |
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/* array_specification [ASSIGN array_initialization] */ |
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/* array_initialization may be NULL ! */ |
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void *search_varfb_instance_type_c::visit(array_spec_init_c *symbol) { |
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this->is_complex = true; |
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return symbol->array_specification->accept(*this); |
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} |
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/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ |
209 |
void *search_varfb_instance_type_c::visit(array_specification_c *symbol) { |
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235 | 210 |
this->is_complex = true; |
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return symbol->non_generic_type_name->accept(*this); |
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} |
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/* structure_type_name ':' structure_specification */ |
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void *search_varfb_instance_type_c::visit(structure_type_declaration_c *symbol) { |
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this->is_complex = true; |
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return symbol->structure_specification->accept(*this); |
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/* NOTE: structure_specification will point to either a |
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* initialized_structure_c |
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* OR A |
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* structure_element_declaration_list_c |
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*/ |
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} |
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224 |
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225 |
/* structure_type_name ASSIGN structure_initialization */ |
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/* structure_initialization may be NULL ! */ |
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// SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization) |
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void *search_varfb_instance_type_c::visit(initialized_structure_c *symbol) { |
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this->is_complex = true; |
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/* recursively find out the data type of var_name... */ |
231 |
return symbol->structure_type_name->accept(*this); |
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} |
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/* helper symbol for structure_declaration */ |
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/* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
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/* structure_element_declaration_list structure_element_declaration ';' */ |
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void *search_varfb_instance_type_c::visit(structure_element_declaration_list_c *symbol) { |
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/* make sure that we have decomposed all structure elements of the variable name */ |
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current_structelement_name = decompose_var_instance_name->next_part(); |
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/* now search the structure declaration */ |
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return visit_list(symbol); |
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} |
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/* structure_element_name ':' spec_init */ |
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void *search_varfb_instance_type_c::visit(structure_element_declaration_c *symbol) { |
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if (NULL == current_structelement_name) ERROR; |
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248 |
if (compare_identifiers(symbol->structure_element_name, current_structelement_name) == 0) |
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return symbol->spec_init->accept(*this); |
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250 |
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return NULL; |
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} |
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/* helper symbol for structure_initialization */ |
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/* structure_initialization: '(' structure_element_initialization_list ')' */ |
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/* structure_element_initialization_list ',' structure_element_initialization */ |
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void *search_varfb_instance_type_c::visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* structure_element_name ASSIGN value */ |
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void *search_varfb_instance_type_c::visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/**************************************/ |
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264 |
/* B.1.5 - Program organization units */ |
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265 |
/**************************************/ |
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266 |
/*****************************/ |
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267 |
/* B 1.5.2 - Function Blocks */ |
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/*****************************/ |
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/* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */ |
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270 |
// SYM_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused) |
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271 |
void *search_varfb_instance_type_c::visit(function_block_declaration_c *symbol) { |
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272 |
/* make sure that we have decomposed all strcuture elements of the variable name */ |
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273 |
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274 |
symbol_c *var_name = decompose_var_instance_name->next_part(); |
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275 |
if (NULL == var_name) { |
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276 |
/* this is it... ! |
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277 |
* No need to look any further... |
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278 |
* Note also that, unlike for the struct types, a function block may |
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279 |
* not be defined based on another (i.e. no inheritance is allowed), |
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280 |
* so this function block is already the most base type. |
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281 |
* We simply return it. |
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282 |
*/ |
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283 |
return (void *)symbol; |
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284 |
} |
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285 |
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286 |
/* now search the function block declaration for the variable... */ |
|
287 |
search_var_instance_decl_c search_decl(symbol); |
|
288 |
symbol_c *var_decl = search_decl.get_decl(var_name); |
|
289 |
if (NULL == var_decl) { |
|
290 |
/* variable instance declaration not found! */ |
|
291 |
return NULL; |
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292 |
} |
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293 |
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294 |
/* We have found the declaration. |
|
295 |
* Should we look any further? |
|
296 |
*/ |
|
297 |
var_name = decompose_var_instance_name->next_part(); |
|
298 |
if (NULL == var_name) { |
|
299 |
/* this is it... ! */ |
|
300 |
return base_type(var_decl); |
|
301 |
} |
|
302 |
||
303 |
current_structelement_name = var_name; |
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304 |
/* recursively find out the data type of var_name... */ |
|
305 |
return symbol->var_declarations->accept(*this); |
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306 |
} |