revert commits improved performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR)
Following commits are reverted:
mjsousa 0b275a2 improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR) -- increase hardcoded limit to 499
mjsousa 2228799 improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR) -- Add comments!!
mjsousa ce81fa6 improve performance of some extensible Standard Functions (ADD, MUL, AND, OR, XOR)"
The reason is that they cause regression in some cases (if function is
used as argument for function block, for example) and this is not
fixed for a long time.
/*
* matiec - a compiler for the programming languages defined in IEC 61131-3
*
* Copyright (C) 2012 Mario de Sousa (msousa@fe.up.pt)
*
* 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)
*
*/
/*
* A small helper visitor class, that will
* return the name (tokn_c *) of a variable, as it will
* appear in the variable declaration.
*/
/* For ex.:
* VAR
* A : int;
* B : ARRAY [1..9] of int;
* C : some_struct_t;
* END_VAR
*
* A := 56;
* B[8] := 99;
* C.e := 77;
*
* Calling this visitor class with symbolic_variable_c instance referencing 'A' in
* the line 'A := 56', will return the string "A".
*
* Calling this visitor class with array_variable_c instance referencing 'B[8]' in
* the line 'B[8] := 99', will return the string "B".
*
* Calling this visitor class with array_variable_c instance referencing 'C.e' in
* the line 'C.e := 77', will return the string "C".
*/
class get_var_name_c : public search_visitor_c {
public:
get_var_name_c(void) {};
~get_var_name_c(void) {};
static token_c *get_name(symbol_c *symbol);
static symbol_c *get_last_field(symbol_c *symbol);
private:
static get_var_name_c *singleton_instance_;
symbol_c *last_field;
private:
/*************************/
/* B.1 - Common elements */
/*************************/
/*******************************************/
/* B 1.1 - Letters, digits and identifiers */
/*******************************************/
// SYM_TOKEN(identifier_c)
void *visit(identifier_c *symbol);
/*********************/
/* B 1.4 - Variables */
/*********************/
// SYM_REF2(symbolic_variable_c, var_name, unused)
void *visit(symbolic_variable_c *symbol);
/********************************************/
/* B.1.4.1 Directly Represented Variables */
/********************************************/
// SYM_TOKEN(direct_variable_c)
// void *visit(direct_variable_c *symbol);
/*************************************/
/* B.1.4.2 Multi-element Variables */
/*************************************/
/* subscripted_variable '[' subscript_list ']' */
// SYM_REF2(array_variable_c, subscripted_variable, subscript_list)
void *visit(array_variable_c *symbol);
/* subscript_list ',' subscript */
// SYM_LIST(subscript_list_c)
// void *visit(subscript_list_c *symbol);
/* record_variable '.' field_selector */
/* WARNING: input and/or output variables of function blocks
* may be accessed as fields of a tructured variable!
* Code handling a structured_variable_c must take
* this into account!
*/
// SYM_REF2(structured_variable_c, record_variable, field_selector)
void *visit(structured_variable_c *symbol);
};