/*
* matiec - a compiler for the programming languages defined in IEC 61131-3
*
* Copyright (C) 2003-2011 Mario de Sousa (msousa@fe.up.pt)
* Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant
*
* 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)
*
*/
/* Search in a VAR* END_VAR declaration for the delcration of the specified variable instance.
* Will return:
* - the declaration itself (get_decl() )
* - the type of declaration in which the variable was declared (get_vartype() )
*
* The variable instance may NOT be a member of a structure of a memeber
* of a structure of an element of an array of ...
*
* For example, considering the following 'variables':
* window.points[1].coordinate.x
* window.points[1].colour
* offset[99]
*
* passing a reference to 'points', 'points[1]', 'points[1].colour', 'colour'
* ARE NOT ALLOWED!
*
* This class must only be passed the name of the variable that will appear
* in the variable declaration. In the above examples, this would be
* 'window.points[1].coordinate.x'
* 'window.points[1].coordinate'
* 'window.points[1]'
* 'window'
* 'window.points[1].colour'
* 'offset'
* 'offset[99]'
*
*
*/
/* Note:
* Determining the declaration type of a specific variable instance (including
* function block instances) really means determining whether the variable was declared in a
* VAR_INPUT
* VAR_OUTPUT
* VAR_IN_OUT
* VAR
* VAR_TEMP
* VAR_EXTERNAL
* VAR_GLOBAL
* VAR <var_name> AT <location> -> Located variable!
*
*/
/* Note:
* The current_type_decl that this class returns may reference the
* name of a type, or the type declaration itself!
* For an example of the first, consider a variable declared as ...
* x : AAA;
* where the AAA type is previously declared as whatever.
* For an example of the second, consider a variable declared as ...
* x : array of int [10]; ----> is allowed
*
* If it is the first, we will return a reference to the name, if the second
* we return a reference to the declaration!!
*/
class search_var_instance_decl_c: public search_visitor_c {
public:
search_var_instance_decl_c(symbol_c *search_scope);
public:
typedef enum {
input_vt , // VAR_INPUT
output_vt , // VAR_OUTPUT
inoutput_vt, // VAR_IN_OUT
private_vt , // VAR
temp_vt , // VAR_TEMP
external_vt, // VAR_EXTERNAL
global_vt , // VAR_GLOBAL
located_vt , // VAR <var_name> AT <location>
none_vt
} vt_t;
typedef enum {
constant_opt ,
retain_opt ,
non_retain_opt,
none_opt
} opt_t;
#if 0
/* the types of variables that need to be processed... */
static const unsigned int none_vt = 0x0000;
static const unsigned int input_vt = 0x0001; // VAR_INPUT
static const unsigned int output_vt = 0x0002; // VAR_OUTPUT
static const unsigned int inoutput_vt = 0x0004; // VAR_IN_OUT
static const unsigned int private_vt = 0x0008; // VAR
static const unsigned int temp_vt = 0x0010; // VAR_TEMP
static const unsigned int external_vt = 0x0020; // VAR_EXTERNAL
static const unsigned int global_vt = 0x0040; // VAR_GLOBAL
static const unsigned int located_vt = 0x0080; // VAR <var_name> AT <location>
static const unsigned int none_opt = 0x0000;
static const unsigned int constant_opt = 0x0001;
static const unsigned int retain_opt = 0x0002;
static const unsigned int non_retain_opt = 0x0003;
#endif
symbol_c * get_decl (symbol_c *variable_instance_name);
vt_t get_vartype(symbol_c *variable_instance_name);
opt_t get_option (symbol_c *variable_instance_name);
/* NOTE: The following function will be completely deleted in the (hopefully near) future. */
/* Returns true if the variable is an ARRAY or a STRUCT, otherwise returns false.
* Note that for FB, also returns false!
*/
bool type_is_complex(symbol_c *variable_name);
private:
symbol_c *search_scope;
symbol_c *search_name;
symbol_c *current_type_decl;
/* variable used to store the type of variable currently being processed... */
/* Will contain a single value of generate_c_vardecl_c::XXXX_vt */
vt_t current_vartype;
opt_t current_option;
private:
/***************************/
/* B 0 - Programming Model */
/***************************/
void *visit(library_c *symbol);
/******************************************/
/* B 1.4.3 - Declaration & Initialisation */
/******************************************/
/* edge -> The F_EDGE or R_EDGE directive */
// SYM_REF2(edge_declaration_c, edge, var1_list)
// TODO
void *visit(constant_option_c *symbol);
void *visit(retain_option_c *symbol);
void *visit(non_retain_option_c *symbol);
void *visit(input_declarations_c *symbol);
/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
/* option -> may be NULL ! */
void *visit(output_declarations_c *symbol);
/* VAR_IN_OUT var_declaration_list END_VAR */
void *visit(input_output_declarations_c *symbol);
/* ENO : BOOL */
void *visit(eno_param_declaration_c *symbol);
/* VAR [CONSTANT] var_init_decl_list END_VAR */
/* option -> may be NULL ! */
/* helper symbol for input_declarations */
void *visit(var_declarations_c *symbol);
/* VAR RETAIN var_init_decl_list END_VAR */
void *visit(retentive_var_declarations_c *symbol);
/* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
/* option -> may be NULL ! */
//SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
void *visit(located_var_declarations_c *symbol);
/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
/* option -> may be NULL ! */
//SYM_REF2(external_var_declarations_c, option, external_declaration_list)
void *visit(external_var_declarations_c *symbol);
/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
/* option -> may be NULL ! */
//SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
void *visit(global_var_declarations_c *symbol);
/* var1_list is one of the following...
* simple_spec_init_c *
* subrange_spec_init_c *
* enumerated_spec_init_c *
*/
// SYM_REF2(var1_init_decl_c, var1_list, spec_init)
void *visit(var1_init_decl_c *symbol);
/* var1_list ',' variable_name */
// SYM_LIST(var1_list_c)
void *visit(var1_list_c *symbol);
/* name_list ':' function_block_type_name ASSIGN structure_initialization */
/* structure_initialization -> may be NULL ! */
void *visit(fb_name_decl_c *symbol);
/* name_list ',' fb_name */
void *visit(fb_name_list_c *symbol);
/* var1_list ':' array_spec_init */
// SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
void *visit(array_var_init_decl_c *symbol);
/* var1_list ':' initialized_structure */
// SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
void *visit(structured_var_init_decl_c *symbol);
/* var1_list ':' array_specification */
// SYM_REF2(array_var_declaration_c, var1_list, array_specification)
void *visit(array_var_declaration_c *symbol);
/* var1_list ':' structure_type_name */
// SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
void *visit(structured_var_declaration_c *symbol);
/* [variable_name] location ':' located_var_spec_init */
/* variable_name -> may be NULL ! */
// SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
// TODO!!
/* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
// SYM_REF2(external_declaration_c, global_var_name, specification)
void *visit(external_declaration_c *symbol);
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
/* type_specification ->may be NULL ! */
// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
void *visit(global_var_decl_c *symbol);
/*| global_var_name location */
//SYM_REF2(global_var_spec_c, global_var_name, location)
void *visit(global_var_spec_c *symbol);
/*| global_var_list ',' global_var_name */
//SYM_LIST(global_var_list_c)
void *visit(global_var_list_c *symbol);
/* [variable_name] location ':' located_var_spec_init */
/* variable_name -> may be NULL ! */
//SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
void *visit(located_var_decl_c *symbol);
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
/* type_specification ->may be NULL ! */
// SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
// TODO!!
/* AT direct_variable */
// SYM_REF2(location_c, direct_variable, unused)
void *visit(location_c *symbol);
/*| global_var_list ',' global_var_name */
// SYM_LIST(global_var_list_c)
// TODO!!
/* var1_list ':' single_byte_string_spec */
// SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
void *visit(single_byte_string_var_declaration_c *symbol);
/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
/* integer ->may be NULL ! */
/* single_byte_character_string ->may be NULL ! */
// SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
// TODO!!
/* var1_list ':' double_byte_string_spec */
// SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
void *visit(double_byte_string_var_declaration_c *symbol);
/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
/* integer ->may be NULL ! */
/* double_byte_character_string ->may be NULL ! */
// SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
// TODO!!
/* variable_name incompl_location ':' var_spec */
// SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
// TODO!!
/* AT incompl_location_token */
// SYM_TOKEN(incompl_location_c)
// TODO!!
/**************************************/
/* B.1.5 - Program organization units */
/**************************************/
/***********************/
/* B 1.5.1 - Functions */
/***********************/
// SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body)
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 */
/********************************/
/*
CONFIGURATION configuration_name
optional_global_var_declarations
(resource_declaration_list | single_resource_declaration)
optional_access_declarations
optional_instance_specific_initializations
END_CONFIGURATION
*/
/*
SYM_REF6(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, unused)
*/
void *visit(configuration_declaration_c *symbol);
/*
RESOURCE resource_name ON resource_type_name
optional_global_var_declarations
single_resource_declaration
END_RESOURCE
*/
// SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration)
void *visit(resource_declaration_c *symbol);
/* task_configuration_list program_configuration_list */
// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
void *visit(single_resource_declaration_c *symbol);
}; // search_var_instance_decl_c