util/symtable.cc
author Mario de Sousa <msousa@fe.up.pt>
Wed, 01 Aug 2012 10:31:14 +0100
changeset 619 f8c9ac5c529a
parent 596 4efb11e44065
child 952 e984cfdf3b10
permissions -rwxr-xr-x
Support for data types of STEP.T and STEP.X in SFCs
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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.
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 *
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 * This is used to create symbol tables such as a list of
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 * variables currently in scope, etc...
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 * Note that the list of previously defined funstions uses the
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 * dsymtable_c instead, as it requires the table to store duplicate values.
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 */
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#include <iostream>
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#include "symtable.hh"
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#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.
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template<typename value_type, value_type null_value>
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symtable_c<value_type, null_value>::symtable_c(void) {inner_scope = NULL;}
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 /* clear all entries... */
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template<typename value_type, value_type null_value>
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void symtable_c<value_type, null_value>::reset(void) {
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  _base.clear();
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}
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 /* create new inner scope */
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template<typename value_type, value_type null_value>
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void symtable_c<value_type, null_value>::push(void) {
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  if (inner_scope != NULL) {
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    inner_scope->push();
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  } else {
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    inner_scope = new symtable_c();
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  }
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}
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  /* clear most inner scope */
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  /* returns 1 if this is the inner most scope	*/
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  /*         0 otherwise			*/
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template<typename value_type, value_type null_value>
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int symtable_c<value_type, null_value>::pop(void) {
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  if (inner_scope != NULL) {
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    if (inner_scope->pop() == 1) {
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      delete inner_scope;
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      inner_scope = NULL;
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    }
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    return 0;
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  } else {
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    _base.clear();
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    return 1;
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  }
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}
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template<typename value_type, value_type null_value>
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void symtable_c<value_type, null_value>::set(const symbol_c *symbol, value_t new_value) {
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  if (inner_scope != NULL) {
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    inner_scope->set(symbol, new_value);
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    return;
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  }
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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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  set(name->value, new_value);
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}
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template<typename value_type, value_type null_value>
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void symtable_c<value_type, null_value>::set(const char *identifier_str, value_t new_value) {
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  if (inner_scope != NULL) {
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    inner_scope->set(identifier_str, new_value);
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    return;
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  }
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  // std::cout << "set_identifier(" << identifier_str << "): \n";
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  iterator i = _base.find(identifier_str);
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  if (i == _base.end())
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    /* identifier not already in map! */
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    ERROR;
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  _base[identifier_str] = new_value;
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}
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template<typename value_type, value_type null_value>
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void symtable_c<value_type, null_value>::insert(const char *identifier_str, value_t new_value) {
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  if (inner_scope != NULL) {
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    inner_scope->insert(identifier_str, new_value);
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    return;
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  }
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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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  std::pair<iterator, bool> res = _base.insert(new_element);
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  if (!res.second)
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    /* error inserting new identifier... */
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    /* identifier already in map?        */
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    ERROR;
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}
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template<typename value_type, value_type null_value>
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void symtable_c<value_type, null_value>::insert(const symbol_c *symbol, value_t new_value) {
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/*
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// not required...
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  if (inner_scope != NULL) {
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    inner_scope->insert(symbol, new_value);
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    return;
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  }
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*/
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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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/* returns null_value if not found! */
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template<typename value_type, value_type null_value>
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value_type symtable_c<value_type, null_value>::find_value(const char *identifier_str) {
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  if (inner_scope != NULL) {
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    value_t token = inner_scope->find_value(identifier_str);
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    if (token != null_value)
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      /* found in the lower level */
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      return token;
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  }
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  /* if no lower level, or not found in lower level... */
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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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value_type symtable_c<value_type, null_value>::find_value(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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  return find_value(name->value);
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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 symtable_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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  if (inner_scope != NULL) {
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    inner_scope->print();
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  }
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}
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