Support for semantic verification of calls to standard functions.
This commit makes a fundamental change in the way standard functions are handled by the compiler.
/*
* matiec - a compiler for the programming languages defined in IEC 61131-3
*
* Copyright (C) 2009-2011 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)
*
*/
/* Verify whether the semantic rules of data type compatibility are being followed.
*
* For example:
*/
#include "visit_expression_type.hh"
#include <typeinfo>
#include <list>
#include <string>
#include <string.h>
#include <strings.h>
#define FIRST_(symbol1, symbol2) (((symbol1)->first_order < (symbol2)->first_order) ? (symbol1) : (symbol2))
#define LAST_(symbol1, symbol2) (((symbol1)->last_order > (symbol2)->last_order) ? (symbol1) : (symbol2))
#define STAGE3_ERROR(symbol1, symbol2, ...) { \
fprintf(stderr, "%s:%d-%d..%d-%d: error : ", \
FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column, \
LAST_(symbol1,symbol2) ->last_line, LAST_(symbol1,symbol2) ->last_column); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
il_error = true; \
error_found = true; \
}
/* set to 1 to see debug info during execution */
static int debug = 0;
void *visit_expression_type_c::visit(program_declaration_c *symbol) {
search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
symbol->var_declarations->accept(*this);
if (debug) printf("checking semantics in body of program %s\n", ((token_c *)(symbol->program_type_name))->value);
il_parenthesis_level = 0;
il_error = false;
il_default_variable_type = NULL;
symbol->function_block_body->accept(*this);
il_default_variable_type = NULL;
delete search_varfb_instance_type;
search_varfb_instance_type = NULL;
return NULL;
}
void *visit_expression_type_c::visit(function_declaration_c *symbol) {
search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
symbol->var_declarations_list->accept(*this);
if (debug) printf("checking semantics in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value);
il_parenthesis_level = 0;
il_error = false;
il_default_variable_type = NULL;
symbol->function_body->accept(*this);
il_default_variable_type = NULL;
delete search_varfb_instance_type;
search_varfb_instance_type = NULL;
return NULL;
}
void *visit_expression_type_c::visit(function_block_declaration_c *symbol) {
search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
symbol->var_declarations->accept(*this);
if (debug) printf("checking semantics in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value);
il_parenthesis_level = 0;
il_error = false;
il_default_variable_type = NULL;
symbol->fblock_body->accept(*this);
il_default_variable_type = NULL;
delete search_varfb_instance_type;
search_varfb_instance_type = NULL;
return NULL;
}
visit_expression_type_c::visit_expression_type_c(symbol_c *ignore) {
error_found = false;
}
visit_expression_type_c::~visit_expression_type_c(void) {
}
bool visit_expression_type_c::get_error_found(void) {
return error_found;
}
/* NOTE on data type handling and literals...
* ==========================================
*
* Literals that are explicitly type cast
* e.g.: BYTE#42
* INT#65
* TIME#45h23m
* etc...
* are NOT considered literals in the following code.
* Since they are type cast, and their data type is fixed and well known,
* they are treated as a variable of that data type (except when determining lvalues)
* In other words, when calling search_constant_type_c on these constants, it returns
* a xxxxx_type_name_c, and not one of the xxxx_literal_c !
*
* When the following code handles a literal, it is really a literal of unknown data type.
* e.g. 42, may be considered an int, a byte, a word, etc...
*
* NOTE: type_symbol == NULL is valid!
* This will occur, for example, when and undefined/undeclared symbolic_variable is used in the program.
* This will not be of any type, so we always return false.
*/
/* A helper function... */
bool visit_expression_type_c::is_ANY_ELEMENTARY_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
return is_ANY_MAGNITUDE_type(type_symbol)
|| is_ANY_BIT_type (type_symbol)
|| is_ANY_STRING_type (type_symbol)
|| is_ANY_DATE_type (type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFEELEMENTARY_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
return is_ANY_SAFEMAGNITUDE_type(type_symbol)
|| is_ANY_SAFEBIT_type (type_symbol)
|| is_ANY_SAFESTRING_type (type_symbol)
|| is_ANY_SAFEDATE_type (type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_ELEMENTARY_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
/* NOTE: doing
* return is_ANY_SAFEELEMENTARY_type() || is_ANY_ELEMENTARY_type()
* is incorrect, as the literals would never be considered compatible...
*/
return is_ANY_MAGNITUDE_compatible(type_symbol)
|| is_ANY_BIT_compatible (type_symbol)
|| is_ANY_STRING_compatible (type_symbol)
|| is_ANY_DATE_compatible (type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_MAGNITUDE_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(time_type_name_c)) {return true;}
return is_ANY_NUM_type(type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFEMAGNITUDE_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(safetime_type_name_c)) {return true;}
return is_ANY_SAFENUM_type(type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_MAGNITUDE_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_MAGNITUDE_type (type_symbol)) {return true;}
if (is_ANY_SAFEMAGNITUDE_type(type_symbol)) {return true;}
return is_ANY_NUM_compatible(type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_NUM_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_REAL_type(type_symbol)) {return true;}
if (is_ANY_INT_type(type_symbol)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFENUM_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
return is_ANY_SAFEREAL_type(type_symbol)
|| is_ANY_SAFEINT_type (type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_NUM_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_REAL_compatible(type_symbol)) {return true;}
if (is_ANY_INT_compatible(type_symbol)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_DATE_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(date_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(tod_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(dt_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFEDATE_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(safedate_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safetod_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safedt_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_DATE_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_DATE_type (type_symbol)) {return true;}
if (is_ANY_SAFEDATE_type(type_symbol)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_STRING_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(string_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(wstring_type_name_c)) {return true;}
// TODO literal_string ???
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFESTRING_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(safestring_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safewstring_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_STRING_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_STRING_type (type_symbol)) {return true;}
if (is_ANY_SAFESTRING_type(type_symbol)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_INT_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(sint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(int_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(dint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(lint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(usint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(uint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(udint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(ulint_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFEINT_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(safesint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safeint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safedint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safelint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safeusint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safeuint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safeudint_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safeulint_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_INT_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_INT_type (type_symbol)) {return true;}
if (is_ANY_SAFEINT_type(type_symbol)) {return true;}
if (is_literal_integer_type(type_symbol)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_REAL_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(real_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(lreal_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFEREAL_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(safereal_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safelreal_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_REAL_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_REAL_type (type_symbol)) {return true;}
if (is_ANY_SAFEREAL_type(type_symbol)) {return true;}
if (is_literal_real_type(type_symbol)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_BIT_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(byte_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(word_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(dword_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(lword_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_SAFEBIT_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(safebool_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safebyte_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safeword_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safedword_type_name_c)) {return true;}
if (typeid(*type_symbol) == typeid(safelword_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_BIT_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_ANY_BIT_type (type_symbol)) {return true;}
if (is_ANY_SAFEBIT_type(type_symbol)) {return true;}
if (is_nonneg_literal_integer_type(type_symbol)) {return true;}
if (is_literal_bool_type(type_symbol)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_BOOL_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_SAFEBOOL_type(symbol_c *type_symbol){
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(safebool_type_name_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_ANY_BOOL_compatible(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (is_BOOL_type (type_symbol)) {return true;}
if (is_SAFEBOOL_type(type_symbol)) {return true;}
if (is_literal_bool_type(type_symbol)) {return true;}
return false;
}
#define is_type(type_name_symbol, type_name_class) ((type_name_symbol == NULL) ? false : (typeid(*type_name_symbol) == typeid(type_name_class)))
#define sizeoftype(symbol) get_sizeof_datatype_c::getsize(symbol)
/* A helper function... */
bool visit_expression_type_c::is_literal_integer_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(neg_integer_c)) {return true;}
return is_nonneg_literal_integer_type(type_symbol);
}
/* A helper function... */
bool visit_expression_type_c::is_nonneg_literal_integer_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(integer_c)) {return true;}
if (typeid(*type_symbol) == typeid(binary_integer_c)) {return true;}
if (typeid(*type_symbol) == typeid(octal_integer_c)) {return true;}
if (typeid(*type_symbol) == typeid(hex_integer_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_literal_real_type(symbol_c *type_symbol) {
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(real_c)) {return true;}
if (typeid(*type_symbol) == typeid(neg_real_c)) {return true;}
return false;
}
/* A helper function... */
bool visit_expression_type_c::is_literal_bool_type(symbol_c *type_symbol) {
bool_type_name_c bool_t;
if (type_symbol == NULL) {return false;}
if (typeid(*type_symbol) == typeid(boolean_true_c)) {return true;}
if (typeid(*type_symbol) == typeid(boolean_false_c)) {return true;}
if (is_nonneg_literal_integer_type(type_symbol))
if (sizeoftype(&bool_t) >= sizeoftype(type_symbol)) {return true;}
return false;
}
/* Determine the common data type between two data types.
* If no common data type found, return NULL.
*
* If data types are identical, return the first (actually any would do...).
* If any of the data types is a literal, we confirm that
* the literal uses less bits than the fixed size data type.
* e.g. BYTE and 1024 returns NULL
* BYTE and 255 returns BYTE
*
* If two literals, then return the literal that requires more bits...
*/
symbol_c *visit_expression_type_c::common_type__(symbol_c *first_type, symbol_c *second_type) {
if (first_type == NULL && second_type == NULL) {return NULL;}
if (first_type == NULL) {return second_type;}
if (second_type == NULL) {return first_type;}
if (is_literal_integer_type(first_type) && is_literal_integer_type(second_type))
{return ((sizeoftype(first_type) > sizeoftype(second_type))? first_type:second_type);}
if (is_literal_real_type(first_type) && is_literal_real_type(second_type))
{return ((sizeoftype(first_type) > sizeoftype(second_type))? first_type:second_type);}
if (is_literal_bool_type(first_type) && is_literal_bool_type(second_type))
{return first_type;}
/* The following check can only be made after the is_literal_XXXX checks */
/* When two literals of the same type, with identical typeid's are checked,
* we must return the one that occupies more bits... This is done above.
*/
if (typeid(*first_type) == typeid(*second_type)) {return first_type;}
/* NOTE Although a BOOL is also an ANY_BIT, we must check it explicitly since some
* literal bool values are not literal integers...
*/
if (is_BOOL_type(first_type) && is_literal_bool_type(second_type)) {return first_type;}
if (is_BOOL_type(second_type) && is_literal_bool_type(first_type)) {return second_type;}
if (is_SAFEBOOL_type(first_type) && is_literal_bool_type(second_type)) {return first_type;}
if (is_SAFEBOOL_type(second_type) && is_literal_bool_type(first_type)) {return second_type;}
if (is_SAFEBOOL_type(first_type) && is_BOOL_type(second_type)) {return second_type;}
if (is_SAFEBOOL_type(second_type) && is_BOOL_type(first_type)) {return first_type;}
if (is_ANY_BIT_type(first_type) && is_nonneg_literal_integer_type(second_type))
{return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_BIT_type(second_type) && is_nonneg_literal_integer_type(first_type))
{return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
if (is_ANY_SAFEBIT_type(first_type) && is_nonneg_literal_integer_type(second_type))
{return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_SAFEBIT_type(second_type) && is_nonneg_literal_integer_type(first_type))
{return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
if (is_ANY_SAFEBIT_type(first_type) && is_ANY_BIT_type(second_type))
{return ((sizeoftype(first_type) == sizeoftype(second_type))? second_type:NULL);}
if (is_ANY_SAFEBIT_type(second_type) && is_ANY_BIT_type(first_type))
{return ((sizeoftype(first_type) == sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_INT_type(first_type) && is_literal_integer_type(second_type))
{return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_INT_type(second_type) && is_literal_integer_type(first_type))
{return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
if (is_ANY_SAFEINT_type(first_type) && is_literal_integer_type(second_type))
{return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_SAFEINT_type(second_type) && is_literal_integer_type(first_type))
{return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
if (is_ANY_SAFEINT_type(first_type) && is_ANY_INT_type(second_type))
{return ((sizeoftype(first_type) == sizeoftype(second_type))? second_type:NULL);}
if (is_ANY_SAFEINT_type(second_type) && is_ANY_INT_type(first_type))
{return ((sizeoftype(first_type) == sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_REAL_type(first_type) && is_literal_real_type(second_type))
{return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_REAL_type(second_type) && is_literal_real_type(first_type))
{return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
if (is_ANY_SAFEREAL_type(first_type) && is_literal_real_type(second_type))
{return ((sizeoftype(first_type) >= sizeoftype(second_type))? first_type :NULL);}
if (is_ANY_SAFEREAL_type(second_type) && is_literal_real_type(first_type))
{return ((sizeoftype(second_type) >= sizeoftype(first_type)) ? second_type:NULL);}
if (is_ANY_SAFEREAL_type(first_type) && is_ANY_REAL_type(second_type))
{return ((sizeoftype(first_type) == sizeoftype(second_type))? second_type:NULL);}
if (is_ANY_SAFEREAL_type(second_type) && is_ANY_REAL_type(first_type))
{return ((sizeoftype(first_type) == sizeoftype(second_type))? first_type :NULL);}
/* the Time and Date types... */
if (is_type(first_type, safetime_type_name_c) && is_type(second_type, time_type_name_c)) {return second_type;}
if (is_type(second_type, safetime_type_name_c) && is_type( first_type, time_type_name_c)) {return first_type;}
if (is_type(first_type, safedate_type_name_c) && is_type(second_type, date_type_name_c)) {return second_type;}
if (is_type(second_type, safedate_type_name_c) && is_type( first_type, date_type_name_c)) {return first_type;}
if (is_type(first_type, safedt_type_name_c) && is_type(second_type, dt_type_name_c)) {return second_type;}
if (is_type(second_type, safedt_type_name_c) && is_type( first_type, dt_type_name_c)) {return first_type;}
if (is_type(first_type, safetod_type_name_c) && is_type(second_type, tod_type_name_c)) {return second_type;}
if (is_type(second_type, safetod_type_name_c) && is_type( first_type, tod_type_name_c)) {return first_type;}
/* no common type */
return NULL;
}
/* Determine the common data type between two data types.
* Unlike the common_type__() function, we stop the compiler with an ERROR
* if no common data type is found.
*/
symbol_c *visit_expression_type_c::common_type(symbol_c *first_type, symbol_c *second_type) {
/*
symbol_c *res = common_type__(first_type, second_type);
if (NULL == res) ERROR;
return res;
*/
return common_type__(first_type, second_type);
}
/* Return TRUE if the second (value) data type may be assigned to a variable of the first (variable) data type
* such as:
* var_type value_type
* BOOL BYTE#7 -> returns false
* INT INT#7 -> returns true
* INT 7 -> returns true
* REAL 7.89 -> returns true
* REAL 7 -> returns true
* INT 7.89 -> returns false
* SAFEBOOL BOOL#1 -> returns false !!!
* etc...
*
* NOTE: It is assumed that the var_type is the data type of an lvalue
*/
bool visit_expression_type_c::is_valid_assignment(symbol_c *var_type, symbol_c *value_type) {
if (var_type == NULL) {/* STAGE3_ERROR(value_type, value_type, "Var_type == NULL"); */ return false;}
if (value_type == NULL) {/* STAGE3_ERROR(var_type, var_type, "Value_type == NULL"); */ return false;}
symbol_c *common_type = common_type__(var_type, value_type);
if (NULL == common_type)
return false;
return (typeid(*var_type) == typeid(*common_type));
}
/* Return TRUE if there is a common data type, otherwise return FALSE
* i.e., return TRUE if both data types may be used simultaneously in an expression
* such as:
* BOOL#0 AND BYTE#7 -> returns false
* 0 AND BYTE#7 -> returns true
* INT#10 AND INT#7 -> returns true
* INT#10 AND 7 -> returns true
* REAL#34.3 AND 7.89 -> returns true
* REAL#34.3 AND 7 -> returns true
* INT#10 AND 7.89 -> returns false
* SAFEBOOL#0 AND BOOL#1 -> returns true !!!
* etc...
*/
bool visit_expression_type_c::is_compatible_type(symbol_c *first_type, symbol_c *second_type) {
if (first_type == NULL || second_type == NULL) {return false;}
return (NULL != common_type__(first_type, second_type));
}
#if 0
#define is_num_type is_ANY_NUM_compatible
#define is_integer_type is_ANY_INT_compatible
#define is_real_type is_ANY_REAL_compatible
#define is_binary_type is_ANY_BIT_compatible
/* actually the ROR, ROL, SHL, and SHR function also accept boolean type! */
#define is_nbinary_type is_ANY_BIT_compatible
#define compute_standard_function_default visit_expression_type_c::compute_standard_function_default
#define compute_standard_function_il visit_expression_type_c::compute_standard_function_il
#define search_expression_type_c visit_expression_type_c
#define search(x) search_f(x)
#define next() next_nf()
// #define search_constant_type_c::constant_int_type_name search_expression_type_c::integer
#define constant_int_type_name integer
#define is_same_type is_compatible_type
#include "../absyntax_utils/search_type_code.c"
#undef is_same_type
#undef constant_int_type_name
// #undef search_constant_type_c::constant_int_type_name
#undef next
#undef search
#undef compute_standard_function_default
#undef compute_standard_function_il
#undef search_expression_type_c
#undef is_real_type
#undef is_binary_type
#undef is_nbinary_type
#undef is_integer_type
#undef is_num_type
#endif
/* A helper function... */
/*
symbol_c *visit_expression_type_c::compute_boolean_expression(symbol_c *left_type, symbol_c *right_type,
is_data_type_t is_data_type) {
*/
symbol_c *visit_expression_type_c::compute_expression(symbol_c *left_type, symbol_c *right_type, is_data_type_t is_data_type,
symbol_c *left_expr, symbol_c *right_expr) {
bool error = false;
if (!(this->*is_data_type)(left_type)) {
if (debug) printf("visit_expression_type_c::compute_expression(): invalid left_type\n");
if (left_expr != NULL)
STAGE3_ERROR(left_expr, left_expr, "Invalid data type of operand, or of data resulting from previous IL instructions.");
error = true;
}
if (!(this->*is_data_type)(right_type)) {
if (debug) printf("visit_expression_type_c::compute_expression(): invalid right_type\n");
if (right_expr != NULL)
STAGE3_ERROR(right_expr, right_expr, "Invalid data type of operand.");
error = true;
}
if (!is_compatible_type(left_type, right_type)) {
if (debug) printf("visit_expression_type_c::compute_expression(): left_type & right_type are incompatible\n");
if ((left_expr != NULL) && (right_expr != NULL))
STAGE3_ERROR(left_expr, right_expr, "Type mismatch between operands.");
error = true;
}
if (error)
return NULL;
else
return common_type(left_type, right_type);
}
# if 0
/* A helper function... */
symbol_c *visit_expression_type_c::compute_numeric_expression(symbol_c *left_type, symbol_c *right_type,
is_data_type_t is_data_type) {
bool error = false;
if (!(this->*is_data_type)(left_type)) {
STAGE3_ERROR(left_type, right_type, "Invalid data type of left operand.");
error = true;
}
if (!(this->*is_data_type)(right_type)) {
STAGE3_ERROR(left_type, right_type, "Invalid data type of right operand.");
error = true;
}
if (!is_compatible_type(left_type, right_type)) {
STAGE3_ERROR(left_type, right_type, "Type mismatch between operands.");
error = true;
}
/*
if (is_literal_integer_type(left_type) || is_literal_real_type(left_type)) {
return right_type;
} else {
return left_type;
}
*/
if (error)
return NULL;
else
return common_type(left_type, right_type);
/* humour the compiler... */
/*
return NULL;
*/
}
#endif
/* A helper function... */
/* check the semantics of a FB or Function non-formal call */
/* e.g. foo(1, 2, 3, 4); */
/* If error_count pointer is != NULL, we do not really print out the errors,
* but rather only count how many errors were found.
* This is used to support overloaded functions, where we have to check each possible
* function, one at a time, untill we find a function call without any errors.
*/
void visit_expression_type_c::check_nonformal_call(symbol_c *f_call, symbol_c *f_decl, bool use_il_defvar, int *error_count) {
symbol_c *call_param_value, *call_param_type, *param_type;
identifier_c *param_name;
function_param_iterator_c fp_iterator(f_decl);
function_call_param_iterator_c fcp_iterator(f_call);
int extensible_parameter_highest_index = -1;
/* reset error counter */
if (error_count != NULL) *error_count = 0;
/* if use_il_defvar, then the first parameter for the call comes from the il_default_variable */
if (use_il_defvar) {
/* The first parameter of the function corresponds to the il_default_variable_type of the function call */
do {
param_name = fp_iterator.next();
if(param_name == NULL) break;
/* The EN and ENO parameters are default parameters.
* In the non-formal invocation of a function there can be no assignment of
* values to these parameters. Therefore, we ignore the parameters declared
* in the function.
*/
} while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
/* If the function does not have any parameters (param_name == NULL)
* then we cannot compare its type with the il_default_variable_type.
*
* However, I (Mario) think this is invalid syntax, as it seems to me all functions must
* have at least one parameter.
* However, we will make this semantic verification consider it possible, as later
* versions of the standard may change that syntax.
* So, instead of generating a syntax error message, we simply check whether the call
* is passing any more parameters besides the default variable (the il default variable may be ignored
* in this case, and not consider it as being a parameter being passed to the function).
* If it does, then we have found a semantic error, otherwise the function call is
* correct, and we simply return.
*/
if(param_name == NULL) {
if (fcp_iterator.next_nf() != NULL)
STAGE3_ERROR(f_call, f_call, "Too many parameters in function/FB call.");
return;
} else {
/* param_name != NULL */
param_type = fp_iterator.param_type();
if(!is_valid_assignment(param_type, il_default_variable_type)) {
if (error_count != NULL) (*error_count)++;
else STAGE3_ERROR(f_call, f_call, "In function/FB call, first parameter has invalid data type.");
}
}
/* the fisrt parameter (il_def_variable) is correct */
if (extensible_parameter_highest_index < fp_iterator.extensible_param_index()) {
extensible_parameter_highest_index = fp_iterator.extensible_param_index();
}
} // if (use_il_defvar)
/* Iterating through the non-formal parameters of the function call */
while((call_param_value = fcp_iterator.next_nf()) != NULL) {
/* Obtaining the type of the value being passed in the function call */
call_param_type = base_type((symbol_c*)call_param_value->accept(*this));
if (call_param_type == NULL) {
if (error_count != NULL) (*error_count)++;
/* the following error will usually occur when ST code uses an identifier, that could refer to an enumerated constant,
* but was not actually used as a constant in any definitions of an enumerated data type
*/
else STAGE3_ERROR(call_param_value, call_param_value, "Could not determine data type of value being passed in function/FB call.");
continue;
}
/* Iterate to the next parameter of the function being called.
* Get the name of that parameter, and ignore if EN or ENO.
*/
do {
param_name = fp_iterator.next();
/* If there is no other parameter declared, then we are passing too many parameters... */
if(param_name == NULL) {
if (error_count != NULL) (*error_count)++;
/* Note: We don't want to print out the follwoing error message multiple times, so we return instead of continuing with 'break' */
else STAGE3_ERROR(f_call, f_call, "Too many parameters in function/FB call."); return;
}
} while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
/* Get the parameter type */
param_type = base_type(fp_iterator.param_type());
/* If the declared parameter and the parameter from the function call do not have the same type */
if(!is_valid_assignment(param_type, call_param_type)) {
if (error_count != NULL) (*error_count)++;
else STAGE3_ERROR(call_param_value, call_param_value, "Type mismatch in function/FB call parameter.");
}
if (extensible_parameter_highest_index < fp_iterator.extensible_param_index()) {
extensible_parameter_highest_index = fp_iterator.extensible_param_index();
}
}
/* The function call may not have any errors! */
/* In the case of a call to an extensible function, we store the highest index
* of the extensible parameters this particular call uses, in the symbol_c object
* of the function call itself!
* In calls to non-extensible functions, this value will be set to -1.
* This information is later used in stage4 to correctly generate the
* output code.
*/
int extensible_param_count = -1;
if (extensible_parameter_highest_index >=0) /* if call to extensible function */
extensible_param_count = 1 + extensible_parameter_highest_index - fp_iterator.first_extensible_param_index();
il_function_call_c *il_function_call = dynamic_cast<il_function_call_c *>(f_call);
function_invocation_c *function_invocation = dynamic_cast<function_invocation_c *>(f_call);
if (il_function_call != NULL) il_function_call ->extensible_param_count = extensible_param_count;
else if (function_invocation != NULL) function_invocation->extensible_param_count = extensible_param_count;
// else ERROR; /* this function is also called by Function Blocks, so this is not an error! */
}
/* check semantics of FB call in the IL language using input operators */
/* e.g. CU, CLK, IN, PT, SR, ... */
void visit_expression_type_c::check_il_fbcall(symbol_c *il_operator, const char *il_operator_str) {
symbol_c *call_param_type = il_default_variable_type;
symbol_c *fb_decl = il_operand_type;
/* The following should never occur. The function block must be defined,
* and the FB type being called MUST be in the symtable...
* This was all already checked at stage 2!
*/
if (NULL == fb_decl) ERROR;
if (call_param_type == NULL) ERROR;
/* We also create an identifier_c object, so we can later use it to find the equivalent FB parameter */
/* Note however that this symbol does not have the correct location (file name and line numbers)
* so any error messages must use the il_operator symbol to generate the error location
*/
identifier_c call_param_name(il_operator_str);
/* Obtaining the type of the value being passed in the function call */
call_param_type = base_type(call_param_type);
if (call_param_type == NULL) STAGE3_ERROR(il_operator, il_operator, "Could not determine data type of value being passed in FB call.");
/* Find the corresponding parameter of the function being called */
function_param_iterator_c fp_iterator(fb_decl);
if(fp_iterator.search(&call_param_name) == NULL) {
STAGE3_ERROR(il_operand, il_operand, "Called FB does not have an input parameter named %s.", il_operator_str);
} else {
/* Get the parameter type */
symbol_c *param_type = base_type(fp_iterator.param_type());
/* If the declared parameter and the parameter from the function call have the same type */
if(!is_valid_assignment(param_type, call_param_type)) STAGE3_ERROR(il_operator, il_operator, "Type mismatch in FB call parameter.");
}
}
/* A helper function... */
/* check the semantics of a FB or Function formal call */
/* e.g. foo(IN1 := 1, OUT1 =>x, EN := true); */
/* If error_count pointer is != NULL, we do not really print out the errors,
* but rather only count how many errors were found.
* This is used to support overloaded functions, where we have to check each possible
* function, one at a time, untill we find a function call without any errors.
*/
void visit_expression_type_c::check_formal_call(symbol_c *f_call, symbol_c *f_decl, int *error_count) {
symbol_c *call_param_value, *call_param_type, *call_param_name, *param_type;
symbol_c *verify_duplicate_param;
identifier_c *param_name;
function_param_iterator_c fp_iterator(f_decl);
function_call_param_iterator_c fcp_iterator(f_call);
int extensible_parameter_highest_index = -1;
identifier_c *extensible_parameter_name;
/* reset error counter */
if (error_count != NULL) *error_count = 0;
/* Iterating through the formal parameters of the function call */
while((call_param_name = fcp_iterator.next_f()) != NULL) {
/* Obtaining the value being passed in the function call */
call_param_value = fcp_iterator.get_current_value();
/* the following should never occur. If it does, then we have a bug in our code... */
if (NULL == call_param_value) ERROR;
/* Checking if there are duplicated parameter values */
verify_duplicate_param = fcp_iterator.search_f(call_param_name);
if(verify_duplicate_param != call_param_value){
if (error_count != NULL) (*error_count)++;
else STAGE3_ERROR(call_param_name, verify_duplicate_param, "Duplicated parameter values.");
}
/* Obtaining the type of the value being passed in the function call */
call_param_type = (symbol_c*)call_param_value->accept(*this);
if (call_param_type == NULL) {
if (error_count != NULL) (*error_count)++;
else STAGE3_ERROR(call_param_name, call_param_value, "Could not determine data type of value being passed in function/FB call.");
/* The data value being passed is possibly any enumerated type value.
* We do not yet handle semantic verification of enumerated types.
*/
ERROR;
}
call_param_type = base_type(call_param_type);
if (call_param_type == NULL) STAGE3_ERROR(call_param_name, call_param_value, "Could not determine data type of value being passed in function/FB call.");
/* Find the corresponding parameter of the function being called */
param_name = fp_iterator.search(call_param_name);
if(param_name == NULL) {
if (error_count != NULL) (*error_count)++;
else STAGE3_ERROR(call_param_name, call_param_name, "Invalid parameter in function/FB call.");
} else {
/* Get the parameter type */
param_type = base_type(fp_iterator.param_type());
/* If the declared parameter and the parameter from the function call have the same type */
if(!is_valid_assignment(param_type, call_param_type)) {
if (error_count != NULL) (*error_count)++;
else STAGE3_ERROR(call_param_name, call_param_value, "Type mismatch function/FB call parameter.");
}
if (extensible_parameter_highest_index < fp_iterator.extensible_param_index()) {
extensible_parameter_highest_index = fp_iterator.extensible_param_index();
extensible_parameter_name = param_name;
}
}
}
/* In the case of a call to an extensible function, we store the highest index
* of the extensible parameters this particular call uses, in the symbol_c object
* of the function call itself!
* In calls to non-extensible functions, this value will be set to -1.
* This information is later used in stage4 to correctly generate the
* output code.
*/
int extensible_param_count = -1;
if (extensible_parameter_highest_index >=0) /* if call to extensible function */
extensible_param_count = 1 + extensible_parameter_highest_index - fp_iterator.first_extensible_param_index();
il_formal_funct_call_c *il_formal_funct_call = dynamic_cast<il_formal_funct_call_c *>(f_call);
function_invocation_c *function_invocation = dynamic_cast<function_invocation_c *>(f_call);
if (il_formal_funct_call != NULL) il_formal_funct_call->extensible_param_count = extensible_param_count;
else if (function_invocation != NULL) function_invocation->extensible_param_count = extensible_param_count;
// else ERROR; /* this function is also called by Function Blocks, so this is not an error! */
/* We have iterated through all the formal parameters of the function call,
* and everything seems fine.
* If the function being called in an extensible function, we now check
* whether the extensible paramters in the formal invocation do not skip
* any indexes...
*
* f(in1:=0, in2:=0, in4:=0) --> ERROR!!
*/
if (extensible_parameter_highest_index >=0) { /* if call to extensible function */
for (int i=fp_iterator.first_extensible_param_index(); i < extensible_parameter_highest_index; i++) {
char tmp[256];
if (snprintf(tmp, 256, "%s%d", extensible_parameter_name->value, i) >= 256) ERROR;
if (fcp_iterator.search_f(tmp) == NULL) {
/* error in invocation of extensible function */
if (error_count != NULL) (*error_count)++;
else STAGE3_ERROR(f_call, f_call, "Missing extensible parameters in call to extensible function.");
}
}
}
}
/* a helper function... */
symbol_c *visit_expression_type_c::base_type(symbol_c *symbol) {
/* NOTE: symbol == NULL is valid. It will occur when, for e.g., an undefined/undeclared symbolic_variable is used
* in the code.
*/
if (symbol == NULL) return NULL;
return (symbol_c *)symbol->accept(search_base_type);
}
/* a helper function... */
void *visit_expression_type_c::verify_null(symbol_c *symbol){
if(il_default_variable_type == NULL){
STAGE3_ERROR(symbol, symbol, "Missing LD instruction (or equivalent) before this instruction.");
}
if(il_operand_type == NULL){
STAGE3_ERROR(symbol, symbol, "This instruction requires an operand.");
}
return NULL;
}
/********************************/
/* B 1.3.3 - Derived data types */
/********************************/
void *visit_expression_type_c::visit(data_type_declaration_c *symbol) {
// TODO !!!
/* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */
return NULL;
}
/*********************/
/* B 1.4 - Variables */
/*********************/
void *visit_expression_type_c::visit(symbolic_variable_c *symbol) {
return search_varfb_instance_type->get_basetype_decl(symbol);
}
/********************************************/
/* B 1.4.1 - Directly Represented Variables */
/********************************************/
void *visit_expression_type_c::visit(direct_variable_c *symbol) {
switch (symbol->value[2]) {
case 'X': // bit - 1 bit
return (void *)&bool_type_name;
case 'B': // byte - 8 bits
return (void *)&byte_type_name;
case 'W': // word - 16 bits
return (void *)&word_type_name;
case 'D': // double word - 32 bits
return (void *)&dword_type_name;
case 'L': // long word - 64 bits
return (void *)&lword_type_name;
default: // if none of the above, then the empty string was used <=> boolean
return (void *)&bool_type_name;
}
}
/*************************************/
/* B 1.4.2 - Multi-element variables */
/*************************************/
void *visit_expression_type_c::visit(array_variable_c *symbol) {
return search_varfb_instance_type->get_basetype_decl(symbol);
}
void *visit_expression_type_c::visit(structured_variable_c *symbol) {
return search_varfb_instance_type->get_basetype_decl(symbol);
}
/********************************/
/* B 1.7 Configuration elements */
/********************************/
void *visit_expression_type_c::visit(configuration_declaration_c *symbol) {
// TODO !!!
/* for the moment we must return NULL so semantic analysis of remaining code is not interrupted! */
return NULL;
}
/****************************************/
/* B.2 - Language IL (Instruction List) */
/****************************************/
/***********************************/
/* B 2.1 Instructions and Operands */
/***********************************/
/*| instruction_list il_instruction */
/* The visitor of the base class search_visitor_c will handle calling each instruction in the list.
* We do not need to do anything here...
*/
// void *visit_expression_type_c::visit(instruction_list_c *symbol)
/* | label ':' [il_incomplete_instruction] eol_list */
//SYM_REF2(il_instruction_c, label, il_instruction)
// void *visit_expression_type_c::visit(il_instruction_c *symbol);
/* | il_simple_operator [il_operand] */
// SYM_REF2(il_simple_operation_c, il_simple_operator, il_operand)
void *visit_expression_type_c::visit(il_simple_operation_c *symbol) {
if (il_error)
return NULL;
/* determine the data type of the operand */
il_operand = symbol->il_operand;
if (symbol->il_operand != NULL){
il_operand_type = base_type((symbol_c *)symbol->il_operand->accept(*this));
} else {
il_operand_type = NULL;
}
/* recursive call to see whether data types are compatible */
symbol->il_simple_operator->accept(*this);
il_operand_type = NULL;
il_operand = NULL;
return NULL;
}
// | function_name [il_operand_list] */
//SYM_REF2(il_function_call_c, function_name, il_operand_list)
void *visit_expression_type_c::visit(il_function_call_c *symbol) {
if (il_error)
return NULL;
symbol_c *return_data_type = NULL;
/* First find the declaration of the function being called! */
function_symtable_t::iterator lower = function_symtable.lower_bound(symbol->function_name);
function_symtable_t::iterator upper = function_symtable.upper_bound(symbol->function_name);
if (lower == function_symtable.end()) ERROR;
int error_count = 0;
int *error_count_ptr = NULL;
function_symtable_t::iterator second = lower;
second++;
if (second != upper)
/* This is a call to an overloaded function... */
error_count_ptr = &error_count;
for(; lower != upper; lower++) {
function_declaration_c *f_decl = function_symtable.get_value(lower);
check_nonformal_call(symbol, f_decl, true, error_count_ptr);
if (0 == error_count) {
/* Either:
* (i) we have a call to a non-overloaded function (error_cnt_ptr is NULL!, so error_count won't change!)
* (ii) we have a call to an overloaded function, with no errors!
*/
/* Store the pointer to the declaration of the function being called.
* This data will be used by stage 4 to call the correct function.
* Mostly needed to disambiguate overloaded functions...
* See comments in absyntax.def for more details
*/
symbol->called_function_declaration = f_decl;
/* determine the base data type returned by the function being called... */
return_data_type = base_type(f_decl->type_name);
/* If the following occurs, then we must have some big bug in the syntax parser (stage 2)... */
if (NULL == return_data_type) ERROR;
/* set the new data type of the default variable for the following verifications... */
il_default_variable_type = return_data_type;
return NULL;
}
}
/* No compatible function was found for this function call */
STAGE3_ERROR(symbol, symbol, "Call to an overloaded function with invalid parameter type.");
return NULL;
}
/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
// SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
void *visit_expression_type_c::visit(il_expression_c *symbol) {
if (il_error)
return NULL;
symbol_c *il_default_variable_type_back = il_default_variable_type;
il_parenthesis_level++;
if(symbol->il_operand != NULL) {
il_default_variable_type = base_type((symbol_c *)symbol->il_operand->accept(*this));
} else {
il_default_variable_type = NULL;
}
if(symbol->simple_instr_list != NULL) {
symbol->simple_instr_list->accept(*this);
}
il_parenthesis_level--;
if (il_parenthesis_level < 0) ERROR;
il_operand = symbol->simple_instr_list;
il_operand_type = il_default_variable_type;
il_default_variable_type = il_default_variable_type_back;
/* Now check the if the data type semantics of operation are correct,
* but only if no previous error has been found...
*/
if (!il_error)
symbol->il_expr_operator->accept(*this);
il_operand_type = NULL;
il_operand = NULL;
return NULL;
}
#if 0
/* il_jump_operator label */
SYM_REF2(il_jump_operation_c, il_jump_operator, label)
void *visit_expression_type_c::visit(il_jump_operation_c *symbol);
#endif
/* il_call_operator prev_declared_fb_name
* | il_call_operator prev_declared_fb_name '(' ')'
* | il_call_operator prev_declared_fb_name '(' eol_list ')'
* | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
* | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
*/
/* SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list) */
void *visit_expression_type_c::visit(il_fb_call_c *symbol) {
if (il_error)
return NULL;
/* first check whether the il_default_variable is of the correct type
* for the CAL / CALC / CALCN operator being used...
*/
symbol->il_call_operator->accept(*this);
/* Now check the FB call itself... */
/* First we find the declaration of the FB type of the FB instance being called... */
/* e.g. Function_block foo_fb_type
* ...
* End_Function_Block
*
* Program test
* var fb1 : foo_fb_type; end_var
* fb1(...)
* End_Program
*
* search_varfb_instance_type->get_basetype_decl( identifier_c("fb1") )
* in the scope of Program 'test'
* will return the fb declaration of foo_fb_type !!
*/
#if 0
symbol_c *fb_decl_symbol = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
/* The following should never occur. The function block must be defined,
* and the FB type being called MUST be in the symtable...
* This was all already checked at stage 2!
*/
if (NULL == fb_decl_symbol) ERROR;
function_block_declaration_c *fb_decl = dynamic_cast<function_block_declaration_c *>(fb_decl_symbol);
/* should never occur. ... */
if (NULL == fb_decl) ERROR;
#endif
symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
/* The following should never occur. The function block must be defined,
* and the FB type being called MUST be in the symtable...
* This was all already checked at stage 2!
*/
if (NULL == fb_decl) ERROR;
/* now check the semantics of the fb call... */
/* If the syntax parser is working correctly, exactly one of the
* following two symbols will be NULL, while the other is != NULL.
*/
if (NULL != symbol->il_operand_list) check_nonformal_call(symbol, fb_decl);
if (NULL != symbol->il_param_list) check_formal_call (symbol, fb_decl);
return NULL;
}
/* | function_name '(' eol_list [il_param_list] ')' */
/* SYM_REF2(il_formal_funct_call_c, function_name, il_param_list) */
void *visit_expression_type_c::visit(il_formal_funct_call_c *symbol) {
if (il_error)
return NULL;
symbol_c *return_data_type = NULL;
function_symtable_t::iterator lower = function_symtable.lower_bound(symbol->function_name);
function_symtable_t::iterator upper = function_symtable.upper_bound(symbol->function_name);
if (lower == function_symtable.end()) {
function_type_t current_function_type = get_function_type((identifier_c *)symbol->function_name);
if (current_function_type == function_none) ERROR;
return NULL;
}
int error_count = 0;
int *error_count_ptr = NULL;
function_symtable_t::iterator second = lower;
second++;
if (second != upper)
/* This is a call to an overloaded function... */
error_count_ptr = &error_count;
for(; lower != upper; lower++) {
function_declaration_c *f_decl = function_symtable.get_value(lower);
/* check semantics of data passed in the function call... */
check_formal_call(symbol, f_decl, error_count_ptr);
if (0 == error_count) {
/* Either:
* (i) we have a call to a non-overloaded function (error_cnt_ptr is NULL!, so error_count won't change!)
* (ii) we have a call to an overloaded function, with no errors!
*/
/* Store the pointer to the declaration of the function being called.
* This data will be used by stage 4 to call the correct function.
* Mostly needed to disambiguate overloaded functions...
* See comments in absyntax.def for more details
*/
symbol->called_function_declaration = f_decl;
/* determine the base data type returned by the function being called... */
return_data_type = base_type(f_decl->type_name);
/* the following should never occur. If it does, then we have a bug in the syntax parser (stage 2)... */
if (NULL == return_data_type) ERROR;
/* the data type of the data returned by the function, and stored in the il default variable... */
il_default_variable_type = return_data_type;
return NULL;
}
}
/* No compatible function was found for this function call */
STAGE3_ERROR(symbol, symbol, "Call to an overloaded function with invalid parameter type.");
return NULL;
}
#if 0
/* | il_operand_list ',' il_operand */
SYM_LIST(il_operand_list_c)
void *visit_expression_type_c::visit(il_operand_list_c *symbol);
/* | simple_instr_list il_simple_instruction */
SYM_LIST(simple_instr_list_c)
void *visit_expression_type_c::visit(simple_instr_list_c *symbol);
/* | il_initial_param_list il_param_instruction */
SYM_LIST(il_param_list_c)
void *visit_expression_type_c::visit(il_param_list_c *symbol);
/* il_assign_operator il_operand
* | il_assign_operator '(' eol_list simple_instr_list ')'
*/
SYM_REF3(il_param_assignment_c, il_assign_operator, il_operand, simple_instr_list)
void *visit_expression_type_c::visit(il_param_assignment_c *symbol);
/* il_assign_out_operator variable */
SYM_REF2(il_param_out_assignment_c, il_assign_out_operator, variable)
void *visit_expression_type_c::visit(il_param_out_assignment_c *symbol);
#endif
/*******************/
/* B 2.2 Operators */
/*******************/
//SYM_REF0(LD_operator_c)
void *visit_expression_type_c::visit(LD_operator_c *symbol) {
if (0 == il_parenthesis_level)
il_error = false;
if(il_operand_type == NULL)
STAGE3_ERROR(symbol, symbol, "LD operator requires an operand.");
il_default_variable_type = il_operand_type;
return NULL;
}
// SYM_REF0(LDN_operator_c)
void *visit_expression_type_c::visit(LDN_operator_c *symbol) {
if(il_operand_type == NULL)
STAGE3_ERROR(symbol, symbol, "LDN operator requires an operand.");
if(!is_ANY_BIT_compatible(il_operand_type))
STAGE3_ERROR(symbol, il_operand, "invalid data type of LDN operand, should be of type ANY_BIT.");
il_default_variable_type = il_operand_type;
return NULL;
}
// SYM_REF0(ST_operator_c)
void *visit_expression_type_c::visit(ST_operator_c *symbol) {
verify_null(symbol);
if(!is_valid_assignment(il_operand_type, il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "Type mismatch in ST operation.");
/* TODO: check whether il_operand_type is an LVALUE !! */
/* data type of il_default_variable_type is unchanged... */
// il_default_variable_type = il_default_variable_type;
return NULL;
}
// SYM_REF0(STN_operator_c)
void *visit_expression_type_c::visit(STN_operator_c *symbol) {
verify_null(symbol);
if(!is_valid_assignment(il_operand_type, il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "Type mismatch in ST operation.");
/* TODO: check whether il_operand_type is an LVALUE !! */
if(!is_ANY_BIT_compatible(il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "invalid data type of il_default_variable for STN operand, should be of type ANY_BIT.");
if(!is_ANY_BIT_compatible(il_operand_type))
STAGE3_ERROR(symbol, il_operand, "invalid data type of STN operand, should be of type ANY_BIT.");
/* data type of il_default_variable_type is unchanged... */
// il_default_variable_type = il_default_variable_type;
return NULL;
}
//SYM_REF0(NOT_operator_c)
void *visit_expression_type_c::visit(NOT_operator_c *symbol) {
if(il_operand_type != NULL){
STAGE3_ERROR(symbol, il_operand, "NOT operator may not have an operand.");
return NULL;
}
if(il_default_variable_type == NULL) {
STAGE3_ERROR(symbol, symbol, "Il default variable should not be NULL.");
return NULL;
}
if(!is_ANY_BIT_compatible(il_default_variable_type)) {
STAGE3_ERROR(symbol, symbol, "Il default variable should be of type ANY_BIT.");
return NULL;
}
/* data type of il_default_variable_type is unchanged... */
// il_default_variable_type = il_default_variable_type;
return NULL;
}
// SYM_REF0(S_operator_c)
void *visit_expression_type_c::visit(S_operator_c *symbol) {
verify_null(symbol);
if (!is_BOOL_type(il_default_variable_type)) {STAGE3_ERROR(symbol, symbol, "IL default variable should be BOOL type.");}
if (!is_BOOL_type(il_operand_type)) {STAGE3_ERROR(symbol, il_operand, "operator S requires operand of type BOOL.");}
/* TODO: check whether il_operand_type is an LVALUE !! */
/* data type of il_default_variable_type is unchanged... */
// il_default_variable_type = il_default_variable_type;
return NULL;
}
// SYM_REF0(R_operator_c)
void *visit_expression_type_c::visit(R_operator_c *symbol) {
verify_null(symbol);
if (!is_BOOL_type(il_default_variable_type)) {STAGE3_ERROR(symbol, symbol, "IL default variable should be BOOL type.");}
if (!is_BOOL_type(il_operand_type)) {STAGE3_ERROR(symbol, il_operand, "operator R requires operand of type BOOL.");}
/* TODO: check whether il_operand_type is an LVALUE !! */
/* data type of il_default_variable_type is unchanged... */
// il_default_variable_type = il_default_variable_type;
return NULL;
}
// SYM_REF0(S1_operator_c)
void *visit_expression_type_c::visit(S1_operator_c *symbol){
check_il_fbcall(symbol, "S1");
return NULL;
}
// SYM_REF0(R1_operator_c)
void *visit_expression_type_c::visit(R1_operator_c *symbol) {
check_il_fbcall(symbol, "R1");
return NULL;
}
// SYM_REF0(CLK_operator_c)
void *visit_expression_type_c::visit(CLK_operator_c *symbol) {
check_il_fbcall(symbol, "CLK");
return NULL;
}
// SYM_REF0(CU_operator_c)
void *visit_expression_type_c::visit(CU_operator_c *symbol) {
check_il_fbcall(symbol, "CU");
return NULL;
}
// SYM_REF0(CD_operator_c)
void *visit_expression_type_c::visit(CD_operator_c *symbol) {
check_il_fbcall(symbol, "CD");
return NULL;
}
// SYM_REF0(PV_operator_c)
void *visit_expression_type_c::visit(PV_operator_c *symbol) {
check_il_fbcall(symbol, "PV");
return NULL;
}
// SYM_REF0(IN_operator_c)
void *visit_expression_type_c::visit(IN_operator_c *symbol) {
check_il_fbcall(symbol, "IN");
return NULL;
}
// SYM_REF0(PT_operator_c)
void *visit_expression_type_c::visit(PT_operator_c *symbol) {
check_il_fbcall(symbol, "PT");
return NULL;
}
//SYM_REF0(AND_operator_c)
void *visit_expression_type_c::visit(AND_operator_c *symbol) {
verify_null(symbol);
il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
symbol , il_operand);
return NULL;
}
//SYM_REF0(OR_operator_c)
void *visit_expression_type_c::visit(OR_operator_c *symbol) {
verify_null(symbol);
il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
symbol , il_operand);
return NULL;
}
//SYM_REF0(XOR_operator_c)
void *visit_expression_type_c::visit(XOR_operator_c *symbol) {
verify_null(symbol);
il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(ANDN_operator_c)
void *visit_expression_type_c::visit(ANDN_operator_c *symbol) {
verify_null(symbol);
il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(ORN_operator_c)
void *visit_expression_type_c::visit(ORN_operator_c *symbol) {
verify_null(symbol);
il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(XORN_operator_c)
void *visit_expression_type_c::visit(XORN_operator_c *symbol) {
verify_null(symbol);
il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_BIT_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(ADD_operator_c)
void *visit_expression_type_c::visit(ADD_operator_c *symbol) {
verify_null(symbol);
symbol_c *left_type = il_default_variable_type;
symbol_c *right_type = il_operand_type;
/* The following is not required, it is already handled by compute_expression() ... */
/*
if (is_type(left_type, time_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &time_type_name;
*/
if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &tod_type_name;
else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &tod_type_name;
else if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &tod_type_name;
else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &safetod_type_name;
else if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &dt_type_name;
else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &dt_type_name;
else if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &dt_type_name;
else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &safedt_type_name;
else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(SUB_operator_c)
void *visit_expression_type_c::visit(SUB_operator_c *symbol) {
verify_null(symbol);
symbol_c *left_type = il_default_variable_type;
symbol_c *right_type = il_operand_type;;
/* The following is not required, it is already handled by compute_expression() ... */
/*
if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c))
il_default_variable_type = &time_type_name;
*/
if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &tod_type_name;
else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &tod_type_name;
else if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &tod_type_name;
else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &safetod_type_name;
else if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &dt_type_name;
else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
il_default_variable_type = &dt_type_name;
else if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &dt_type_name;
else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
il_default_variable_type = &safedt_type_name;
else if (is_type(left_type, date_type_name_c) && is_type(right_type, date_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safedate_type_name_c) && is_type(right_type, date_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, date_type_name_c) && is_type(right_type, safedate_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safedate_type_name_c) && is_type(right_type, safedate_type_name_c))
il_default_variable_type = &safetime_type_name;
else if (is_type(left_type, tod_type_name_c) && is_type(right_type, tod_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, tod_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetod_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetod_type_name_c))
il_default_variable_type = &safetime_type_name;
else if (is_type(left_type, dt_type_name_c) && is_type(right_type, dt_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, dt_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, dt_type_name_c) && is_type(right_type, safedt_type_name_c))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safedt_type_name_c))
il_default_variable_type = &safetime_type_name;
else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(MUL_operator_c)
void *visit_expression_type_c::visit(MUL_operator_c *symbol) {
verify_null(symbol);
symbol_c *left_type = il_default_variable_type;
symbol_c *right_type = il_operand_type;
if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
il_default_variable_type = &safetime_type_name;
/* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
* this next line is really only to check for integers/reals of undefined type on 'right_type'...
*/
else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
il_default_variable_type = &safetime_type_name;
else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_NUM_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(DIV_operator_c)
void *visit_expression_type_c::visit(DIV_operator_c *symbol) {
verify_null(symbol);
symbol_c *left_type = il_default_variable_type;
symbol_c *right_type = il_operand_type;
if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
il_default_variable_type = &time_type_name;
else if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
il_default_variable_type = &safetime_type_name;
/* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
* this next line is really only to check for integers/reals of undefined type on 'right_type'...
*/
else if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
il_default_variable_type = &safetime_type_name;
else il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_NUM_compatible,
symbol , il_operand);
return NULL;
}
// SYM_REF0(MOD_operator_c)
void *visit_expression_type_c::visit(MOD_operator_c *symbol) {
verify_null(symbol);
il_default_variable_type = compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_INT_compatible);
return NULL;
}
// SYM_REF0(GT_operator_c)
void *visit_expression_type_c::visit(GT_operator_c *symbol) {
verify_null(symbol);
compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
symbol , il_operand);
il_default_variable_type = &search_expression_type_c::bool_type_name;
return NULL;
}
//SYM_REF0(GE_operator_c)
void *visit_expression_type_c::visit(GE_operator_c *symbol) {
verify_null(symbol);
compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
symbol , il_operand);
il_default_variable_type = &search_expression_type_c::bool_type_name;
return NULL;
}
//SYM_REF0(EQ_operator_c)
void *visit_expression_type_c::visit(EQ_operator_c *symbol) {
verify_null(symbol);
compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
symbol , il_operand);
il_default_variable_type = &search_expression_type_c::bool_type_name;
return NULL;
}
//SYM_REF0(LT_operator_c)
void *visit_expression_type_c::visit(LT_operator_c *symbol) {
verify_null(symbol);
compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
symbol , il_operand);
il_default_variable_type = &search_expression_type_c::bool_type_name;
return NULL;
}
//SYM_REF0(LE_operator_c)
void *visit_expression_type_c::visit(LE_operator_c *symbol) {
verify_null(symbol);
compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
symbol , il_operand);
il_default_variable_type = &search_expression_type_c::bool_type_name;
return NULL;
}
//SYM_REF0(NE_operator_c)
void *visit_expression_type_c::visit(NE_operator_c *symbol) {
verify_null(symbol);
compute_expression(il_default_variable_type, il_operand_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible,
symbol , il_operand);
il_default_variable_type = &search_expression_type_c::bool_type_name;
return NULL;
}
// SYM_REF0(CAL_operator_c)
void *visit_expression_type_c::visit(CAL_operator_c *symbol) {
return NULL;
}
// SYM_REF0(CALC_operator_c)
void *visit_expression_type_c::visit(CALC_operator_c *symbol) {
if(il_default_variable_type == NULL)
STAGE3_ERROR(symbol, symbol, "CALC: il default variable should not be NULL.");
if (!is_BOOL_type(il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "CALC operator requires il_default_variable to be of type BOOL.");
return NULL;
}
// SYM_REF0(CALCN_operator_c)
void *visit_expression_type_c::visit(CALCN_operator_c *symbol) {
if(il_default_variable_type == NULL)
STAGE3_ERROR(symbol, symbol, "CALCN: il_default_variable should not be NULL.");
if (!is_BOOL_type(il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "CALCN operator requires il_default_variable to be of type BOOL.");
return NULL;
}
// SYM_REF0(RET_operator_c)
void *visit_expression_type_c::visit(RET_operator_c *symbol) {
return NULL;
}
// SYM_REF0(RETC_operator_c)
void *visit_expression_type_c::visit(RETC_operator_c *symbol) {
if(il_default_variable_type == NULL)
STAGE3_ERROR(symbol, symbol, "RETC: il default variable should not be NULL.");
if (!is_BOOL_type(il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "RETC operator requires il_default_variable to be of type BOOL.");
return NULL;
}
// SYM_REF0(RETCN_operator_c)
void *visit_expression_type_c::visit(RETCN_operator_c *symbol) {
if(il_default_variable_type == NULL)
STAGE3_ERROR(symbol, symbol, "RETCN: il_default_variable should not be NULL.");
if (!is_BOOL_type(il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "RETCN operator requires il_default_variable to be of type BOOL.");
return NULL;
}
// SYM_REF0(JMP_operator_c)
void *visit_expression_type_c::visit(JMP_operator_c *symbol){
return NULL;
}
// SYM_REF0(JMPC_operator_c)
void *visit_expression_type_c::visit(JMPC_operator_c *symbol) {
if(il_default_variable_type == NULL)
STAGE3_ERROR(symbol, symbol, "JMPC: il default variable should not be NULL.");
if (!is_BOOL_type(il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "JMPC operator requires il_default_variable to be of type BOOL.");
return NULL;
}
// SYM_REF0(JMPCN_operator_c)
void *visit_expression_type_c::visit(JMPCN_operator_c *symbol) {
if(il_default_variable_type == NULL)
STAGE3_ERROR(symbol, symbol, "JMPCN: il_default_variable should not be NULL.");
if (!is_BOOL_type(il_default_variable_type))
STAGE3_ERROR(symbol, symbol, "JMPCN operator requires il_default_variable to be of type BOOL.");
return NULL;
}
/* Symbol class handled together with function call checks */
/* any_identifier ASSIGN */
// SYM_REF1(il_assign_operator_c, variable_name)
// void *visit_expression_type_c::visit(il_assign_operator_c *symbol, variable_name);
/* Symbol class handled together with function call checks */
/*| [NOT] any_identifier SENDTO */
// SYM_REF2(il_assign_out_operator_c, option, variable_name)
// void *visit_expression_type_c::visit(il_assign_operator_c *symbol, option, variable_name);
/***************************************/
/* B.3 - Language ST (Structured Text) */
/***************************************/
/***********************/
/* B 3.1 - Expressions */
/***********************/
void *visit_expression_type_c::visit(or_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_compatible);
}
void *visit_expression_type_c::visit(xor_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_compatible);
}
void *visit_expression_type_c::visit(and_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_BIT_compatible);
}
void *visit_expression_type_c::visit(equ_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible);
return &search_expression_type_c::bool_type_name;
}
void *visit_expression_type_c::visit(notequ_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible);
return &search_expression_type_c::bool_type_name;
}
void *visit_expression_type_c::visit(lt_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible);
return &search_expression_type_c::bool_type_name;
}
void *visit_expression_type_c::visit(gt_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible);
return &search_expression_type_c::bool_type_name;
}
void *visit_expression_type_c::visit(le_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible);
return &search_expression_type_c::bool_type_name;
}
void *visit_expression_type_c::visit(ge_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_ELEMENTARY_compatible);
return &search_expression_type_c::bool_type_name;
}
void *visit_expression_type_c::visit(add_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
/* The following is already checked in compute_expression */
/*
if (is_type(left_type, time_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&time_type_name;
*/
if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&tod_type_name;
if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&tod_type_name;
if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&tod_type_name;
if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&safetod_type_name;
if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&dt_type_name;
if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&dt_type_name;
if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&dt_type_name;
if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&safedt_type_name;
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible);
}
void *visit_expression_type_c::visit(sub_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
/* The following is already checked in compute_expression */
/*
if (is_type(left_type, time_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&time_type_name;
*/
if (is_type(left_type, tod_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&tod_type_name;
if (is_type(left_type, safetod_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&tod_type_name;
if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&tod_type_name;
if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&safetod_type_name;
if (is_type(left_type, dt_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&dt_type_name;
if (is_type(left_type, safedt_type_name_c) && is_type(right_type, time_type_name_c))
return (void *)&dt_type_name;
if (is_type(left_type, dt_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&dt_type_name;
if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safetime_type_name_c))
return (void *)&safedt_type_name;
if (is_type(left_type, tod_type_name_c) && is_type(right_type, tod_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, safetod_type_name_c) && is_type(right_type, tod_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, tod_type_name_c) && is_type(right_type, safetod_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, safetod_type_name_c) && is_type(right_type, safetod_type_name_c))
return (void *)&safetime_type_name;
if (is_type(left_type, date_type_name_c) && is_type(right_type, date_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, safedate_type_name_c) && is_type(right_type, date_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, date_type_name_c) && is_type(right_type, safedate_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, safedate_type_name_c) && is_type(right_type, safedate_type_name_c))
return (void *)&safetime_type_name;
if (is_type(left_type, dt_type_name_c) && is_type(right_type, dt_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, safedt_type_name_c) && is_type(right_type, dt_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, dt_type_name_c) && is_type(right_type, safedt_type_name_c))
return (void *)&time_type_name;
if (is_type(left_type, safedt_type_name_c) && is_type(right_type, safedt_type_name_c))
return (void *)&safetime_type_name;
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_MAGNITUDE_compatible);
}
void *visit_expression_type_c::visit(mul_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
return (void *)&time_type_name;
if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
return (void *)&time_type_name;
if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
return (void *)&safetime_type_name;
/* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
* this next line is really only to check for integers/reals of undefined type on 'right_type'...
*/
if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
return (void *)&safetime_type_name;
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_NUM_compatible);
}
void *visit_expression_type_c::visit(div_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
if (is_type(left_type, time_type_name_c) && is_ANY_NUM_compatible(right_type))
return (void *)&time_type_name;
if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_type(right_type))
return (void *)&time_type_name;
if (is_type(left_type, safetime_type_name_c) && is_ANY_SAFENUM_type(right_type))
return (void *)&safetime_type_name;
/* Since we have already checked for ANY_NUM_type and ANY_SAFENUM_type in the previous lines,
* this next line is really only to check for integers/reals of undefined type on 'right_type'...
*/
if (is_type(left_type, safetime_type_name_c) && is_ANY_NUM_compatible(right_type))
return (void *)&safetime_type_name;
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_NUM_compatible);
}
void *visit_expression_type_c::visit(mod_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
return compute_expression(left_type, right_type, &visit_expression_type_c::is_ANY_INT_compatible);
}
void *visit_expression_type_c::visit(power_expression_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
if (!is_ANY_REAL_compatible(left_type))
STAGE3_ERROR(symbol->l_exp, symbol->l_exp, "first operand of ** operator has invalid data type, should be of type ANY_REAL.");
if (!is_ANY_NUM_compatible(right_type))
STAGE3_ERROR(symbol->r_exp, symbol->r_exp, "second operand of ** operator has invalid data type, should be of type ANY_NUM.");
return (void *)left_type;
}
void *visit_expression_type_c::visit(neg_expression_c *symbol) {
symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this));
if (!is_ANY_MAGNITUDE_compatible(exp_type))
STAGE3_ERROR(symbol, symbol, "operand of negate expression '-' has invalid data type, should be of type ANY_MAGNITUDE.");
return exp_type;
}
void *visit_expression_type_c::visit(not_expression_c *symbol) {
symbol_c *type = base_type((symbol_c *)symbol->exp->accept(*this));
return compute_expression(type, type, &visit_expression_type_c::is_ANY_BIT_compatible);
}
void *visit_expression_type_c::visit(function_invocation_c *symbol) {
function_symtable_t::iterator lower = function_symtable.lower_bound(symbol->function_name);
function_symtable_t::iterator upper = function_symtable.upper_bound(symbol->function_name);
if (lower == function_symtable.end()) ERROR;
function_symtable_t::iterator second = lower;
second++;
if (second == upper) {
/* call to a function that is not overloaded. */
/* now check the semantics of the function call... */
/* If the syntax parser is working correctly, exactly one of the
* following two symbols will be NULL, while the other is != NULL.
*/
function_declaration_c *f_decl = function_symtable.get_value(lower);
if (symbol-> formal_param_list != NULL) check_formal_call (symbol, f_decl);
if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, f_decl);
/* Store the pointer to the declaration of the function being called.
* This data will be used by stage 4 to call the correct function.
* Mostly needed to disambiguate overloaded functions...
* See comments in absyntax.def for more details
*/
symbol->called_function_declaration = f_decl;
return base_type(f_decl->type_name);
}
/* This is a call to an overloaded function... */
if (debug) printf("visit_expression_type_c::visit(function_invocation_c *symbol): FOUND CALL TO OVERLOADED FUNCTION!!\n");
for(; lower != upper; lower++) {
if (debug) printf("visit_expression_type_c::visit(function_invocation_c *symbol): FOUND CALL TO OVERLOADED FUNCTION!! iterating...\n");
int error_count = 0;
function_declaration_c *f_decl = function_symtable.get_value(lower);
if (symbol-> formal_param_list != NULL) check_formal_call (symbol, f_decl, &error_count);
if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, f_decl, false, &error_count);
if (0 == error_count) {
/* Store the pointer to the declaration of the function being called.
* This data will be used by stage 4 to call the correct function.
* Mostly needed to disambiguate overloaded functions...
* See comments in absyntax.def for more details
*/
symbol->called_function_declaration = f_decl;
return base_type(f_decl->type_name);
}
}
/* No compatible function was found for this function call */
STAGE3_ERROR(symbol, symbol, "Call to an overloaded function with invalid parameter type.");
return NULL;
}
/********************/
/* B 3.2 Statements */
/********************/
// SYM_LIST(statement_list_c)
/* The visitor of the base class search_visitor_c will handle calling each instruction in the list.
* We do not need to do anything here...
*/
// void *visit_expression_type_c::visit(statement_list_c *symbol)
/*********************************/
/* B 3.2.1 Assignment Statements */
/*********************************/
void *visit_expression_type_c::visit(assignment_statement_c *symbol) {
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this));
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this));
if (debug) {
printf("visit_expression_type_c::visit(assignment_statement_c) called. Checking --->");
symbolic_variable_c *hi = dynamic_cast<symbolic_variable_c *>(symbol->l_exp);
if (hi != NULL) {
identifier_c *hi1 = dynamic_cast<identifier_c *>(hi->var_name);
if (hi1 != NULL) printf("%s", hi1->value);
}
printf(" := ");
hex_integer_c *hi2 = dynamic_cast<hex_integer_c *>(symbol->r_exp);
if (hi2 != NULL) printf("%s", hi2->value);
printf("\n");
} // if (debug)
if (!is_valid_assignment(left_type, right_type)) {
STAGE3_ERROR(symbol, symbol, "data type mismatch in assignment statement!\n");
}
return NULL;
}
/*****************************************/
/* B 3.2.2 Subprogram Control Statements */
/*****************************************/
/* RETURN */
// SYM_REF0(return_statement_c)
/* fb_name '(' [param_assignment_list] ')' */
/* param_assignment_list -> may be NULL ! */
// SYM_REF3(fb_invocation_c, fb_name, formal_param_list, nonformal_param_list)
void *visit_expression_type_c::visit(fb_invocation_c *symbol) {
symbol_c *fb_decl = search_varfb_instance_type->get_basetype_decl(symbol->fb_name);
/* The following should never occur. The function block must be defined,
* and the FB type being called MUST be in the symtable...
* This was all already checked at stage 2!
*/
if (NULL == fb_decl) ERROR;
/* now check the semantics of the fb call... */
/* If the syntax parser is working correctly, exactly one of the
* following two symbols will be NULL, while the other is != NULL.
*/
if (symbol-> formal_param_list != NULL) check_formal_call (symbol, fb_decl);
if (symbol->nonformal_param_list != NULL) check_nonformal_call(symbol, fb_decl);
return NULL;
}
#if 0
/* helper symbol for fb_invocation */
/* param_assignment_list ',' param_assignment */
SYM_LIST(param_assignment_list_c)
/* variable_name ASSIGN expression */
SYM_REF2(input_variable_param_assignment_c, variable_name, expression)
/* [NOT] variable_name '=>' variable */
SYM_REF3(output_variable_param_assignment_c, not_param, variable_name, variable)
/* helper CLASS for output_variable_param_assignment */
SYM_REF0(not_paramassign_c)
#endif
/********************************/
/* B 3.2.3 Selection Statements */
/********************************/
/* IF expression THEN statement_list elseif_statement_list ELSE statement_list END_IF */
// SYM_REF4(if_statement_c, expression, statement_list, elseif_statement_list, else_statement_list)
void *visit_expression_type_c::visit(if_statement_c *symbol) {
symbol_c *expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
if (!is_BOOL_type(expr_type)) STAGE3_ERROR(symbol->expression,symbol->expression,"IF conditional expression is not of boolean type.");
if (NULL != symbol->statement_list)
symbol->statement_list->accept(*this);
if (NULL != symbol->elseif_statement_list)
symbol->elseif_statement_list->accept(*this);
if (NULL != symbol->else_statement_list)
symbol->else_statement_list->accept(*this);
return NULL;
}
/* helper symbol for if_statement */
// SYM_LIST(elseif_statement_list_c)
// void *visit_expression_type_c::visit(elseif_statement_list_c *symbol) { }
/* helper symbol for elseif_statement_list */
/* ELSIF expression THEN statement_list */
// SYM_REF2(elseif_statement_c, expression, statement_list)
void *visit_expression_type_c::visit(elseif_statement_c *symbol) {
symbol_c *elseif_expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
if(!is_BOOL_type(elseif_expr_type)) STAGE3_ERROR(symbol->expression,symbol->expression,"ELSIF conditional expression is not of boolean type.");
if (NULL != symbol->statement_list)
symbol->statement_list->accept(*this);
return NULL;
}
/* CASE expression OF case_element_list ELSE statement_list END_CASE */
// SYM_REF3(case_statement_c, expression, case_element_list, statement_list)
void *visit_expression_type_c::visit(case_statement_c *symbol) {
case_expression_type = base_type((symbol_c*)symbol->expression->accept(*this));
if (NULL != case_expression_type) {
if (NULL != symbol->case_element_list)
symbol->case_element_list->accept(*this);
}
if (NULL != symbol->statement_list)
symbol->statement_list->accept(*this);
return NULL;
}
#if 0
/* helper symbol for case_statement */
// SYM_LIST(case_element_list_c)
// void *visit_expression_type_c::visit(case_element_list_c *symbol);
/* case_list ':' statement_list */
// SYM_REF2(case_element_c, case_list, statement_list)
void *visit_expression_type_c::visit(case_element_c *symbol);
#endif
// SYM_LIST(case_list_c)
void *visit_expression_type_c::visit(case_list_c *symbol) {
symbol_c *element_type;
for(int i = 0; i < symbol->n; i++) {
element_type = (symbol_c *)symbol->elements[i]->accept(*this);
if (NULL == element_type) {
STAGE3_ERROR(symbol->elements[i], symbol->elements[i], "Case list element has undefined data type.");
} else {
element_type = base_type(element_type);
if (NULL != element_type){
/* The CASE value is only used for comparison (and not assingment), so we only check for compatibility! */
if (!is_compatible_type(case_expression_type, element_type))
STAGE3_ERROR(symbol->elements[i], symbol->elements[i], "Invalid data type of case list element.");
}
}
}
return NULL;
}
/********************************/
/* B 3.2.4 Iteration Statements */
/********************************/
/* FOR control_variable ASSIGN expression TO expression [BY expression] DO statement_list END_FOR */
// SYM_REF5(for_statement_c, control_variable, beg_expression, end_expression, by_expression, statement_list)
void *visit_expression_type_c::visit(for_statement_c *symbol) {
symbol_c *var_type = (symbol_c*)symbol->control_variable->accept(*this);
if (NULL == var_type) ERROR;
var_type = base_type(var_type);
if (NULL == var_type) ERROR;
// ASSIGN
symbol_c *beg_expr_type = base_type((symbol_c*)symbol->beg_expression->accept(*this));
if (NULL != beg_expr_type) {
/* The BEG value is assigned to the variable, so we check for assignment validity! */
if(!is_valid_assignment(var_type, beg_expr_type))
STAGE3_ERROR(symbol->beg_expression, symbol->beg_expression, "Data type mismatch between control variable and initial value.");
}
// TO
symbol_c *end_expr_type = base_type((symbol_c*)symbol->end_expression->accept(*this));
if (NULL != end_expr_type) {
/* The TO value is only used for comparison, so we only check for compatibility! */
if(!is_compatible_type(var_type, end_expr_type))
STAGE3_ERROR(symbol->end_expression, symbol->end_expression, "Data type mismatch between control variable and final value.");
}
// BY
if(symbol->by_expression != NULL) {
symbol_c *by_expr_type = base_type((symbol_c*)symbol->by_expression->accept(*this));
if (NULL != end_expr_type) {
/* The BY value is used in an expression (add, sub, ...), so we only check for compatibility! */
if(!is_compatible_type(var_type, by_expr_type))
STAGE3_ERROR(symbol->by_expression, symbol->by_expression, "Data type mismatch between control variable and BY value.");
}
}
// DO
if (NULL != symbol->statement_list)
symbol->statement_list->accept(*this);
return NULL;
}
/* WHILE expression DO statement_list END_WHILE */
// SYM_REF2(while_statement_c, expression, statement_list)
void *visit_expression_type_c::visit(while_statement_c *symbol) {
symbol_c *expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
if (NULL != expr_type) {
if(!is_BOOL_type(expr_type))
STAGE3_ERROR(symbol->expression,symbol->expression,"WHILE conditional expression is not of boolean type.");
}
if (NULL != symbol->statement_list)
symbol->statement_list->accept(*this);
return NULL;
}
/* REPEAT statement_list UNTIL expression END_REPEAT */
// SYM_REF2(repeat_statement_c, statement_list, expression)
void *visit_expression_type_c::visit(repeat_statement_c *symbol) {
if (NULL != symbol->statement_list)
symbol->statement_list->accept(*this);
symbol_c *expr_type = base_type((symbol_c*)symbol->expression->accept(*this));
if (NULL != expr_type) {
if(!is_BOOL_type(expr_type))
STAGE3_ERROR(symbol->expression,symbol->expression,"REPEAT conditional expression is not of boolean type.");
}
return NULL;
}
/* EXIT */
// SYM_REF0(exit_statement_c)