util/dsymtable.cc
author Manuele Conti <conti.ma@alice.it>
Sat, 21 Apr 2012 17:42:07 +0200
changeset 527 1d83209aabfe
parent 350 2c3c4dc34979
child 596 4efb11e44065
permissions -rwxr-xr-x
Start implement lvalue check in IL instruction.
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * A generic symbol table that allows duplicate values.
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 *
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 * This is used to create a symbol table of previously defined
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 * functions. Duplicate are allowed since the standard permits function\
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 * overloading in the standard library.
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 */
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#include <iostream>
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#include "symtable.hh"
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/* A macro for printing out internal parser errors... */
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#define ERROR error_exit(__FILE__,__LINE__)
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/* function defined in main.cc */
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extern void error_exit(const char *file_name, int line_no);
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 /* clear all entries... */
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template<typename value_type, value_type null_value>
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void dsymtable_c<value_type, null_value>::reset(void) {
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  _base.clear();
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}
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template<typename value_type, value_type null_value>
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void dsymtable_c<value_type, null_value>::insert(const char *identifier_str, value_t new_value) {
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  // std::cout << "store_identifier(" << identifier_str << "): \n";
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  std::pair<const char *, value_t> new_element(identifier_str, new_value);
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  /* iterator res = */ _base.insert(new_element);
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}
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template<typename value_type, value_type null_value>
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void dsymtable_c<value_type, null_value>::insert(const symbol_c *symbol, value_t new_value) {
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  const token_c *name = dynamic_cast<const token_c *>(symbol);
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  if (name == NULL)
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    ERROR;
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  insert(name->value, new_value);
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}
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#if 0
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template<typename value_type, value_type null_value>
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void dsymtable_c<value_type, null_value>::insert_noduplicate(const char *identifier_str, value_t new_value) {
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  if (find_value(identifier_str) != null_value)
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    /* already present in the set! */
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    ERROR;
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  // std::cout << "store_identifier(" << identifier_str << "): \n";
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  std::pair<const char *, value_t> new_element(identifier_str, new_value);
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  /* iterator res = */ _base.insert(new_element);
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}
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template<typename value_type, value_type null_value>
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void dsymtable_c<value_type, null_value>::insert_noduplicate(const symbol_c *symbol, value_t new_value) {
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  const token_c *name = dynamic_cast<const token_c *>(symbol);
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  if (name == NULL)
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    ERROR;
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  insert_noduplicate(name->value, new_value);
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}
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#endif
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/* Determine how many entries are associated to key identifier_str */ 
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/* returns:
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 *         0: if no entry is found
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 *         1: if 1 entry is found
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 *         2: if more than 1 entry is found 
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 */
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template<typename value_type, value_type null_value>
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int dsymtable_c<value_type, null_value>::multiplicity(const char *identifier_str) {
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  iterator lower = _base.lower_bound(identifier_str);
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  if (lower == _base.end()) return 0;
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  iterator upper = _base.upper_bound(identifier_str);
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  iterator second = lower;
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  second++;
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  if (second == upper) return 1;
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  return 2;
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}
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/* returns null_value if not found! */
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template<typename value_type, value_type null_value>
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value_type dsymtable_c<value_type, null_value>::find_value(const char *identifier_str) {
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  iterator i = _base.find(identifier_str);
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  if (i == _base.end())
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    return null_value;
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  else
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    return i->second;
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}
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template<typename value_type, value_type null_value>
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const char * dsymtable_c<value_type, null_value>::symbol_to_string(const symbol_c *symbol) {
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  const token_c *name = dynamic_cast<const token_c *>(symbol);
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  if (name == NULL)
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    ERROR;
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2c3c4dc34979 Support for semantic verification of calls to standard functions.
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  return name->value;
0
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}
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/* debuging function... */
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template<typename value_type, value_type null_value>
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void dsymtable_c<value_type, null_value>::print(void) {
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  for(iterator i = _base.begin();
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      i != _base.end();
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      i++)
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    std::cout << i->second << ":" << i->first << "\n";
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  std::cout << "=====================\n";
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}
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