util/symtable.cc
author mjsousa
Sat, 27 Dec 2014 09:41:01 +0000
changeset 976 619a2b9f6edf
parent 974 a47c2df5ae3d
permissions -rwxr-xr-x
Add comments.
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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>
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symtable_c<value_type>::symtable_c(void) {inner_scope = NULL;}
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 /* clear all entries... */
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template<typename value_type>
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void symtable_c<value_type>::clear(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>
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void symtable_c<value_type>::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>
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int symtable_c<value_type>::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>
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void symtable_c<value_type>::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>
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void symtable_c<value_type>::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>
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void symtable_c<value_type>::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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  iterator i = _base.find(identifier_str);
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  if ((i != _base.end()) && (i->second != new_value)) {ERROR;}  /* error inserting new identifier: identifier already in map associated to a different value */
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  if ((i != _base.end()) && (i->second == new_value)) {return;} /* identifier already in map associated with the same value */
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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) {ERROR;} /* unknown error inserting new identifier */
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}
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template<typename value_type>
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void symtable_c<value_type>::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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template<typename value_type>
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int symtable_c<value_type>::count(const       char *identifier_str) {return _base.count(identifier_str)+((inner_scope == NULL)?0:inner_scope->count(identifier_str));}
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template<typename value_type>
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int symtable_c<value_type>::count(const std::string identifier_str) {return _base.count(identifier_str)+((inner_scope == NULL)?0:inner_scope->count(identifier_str));}
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// in the operator[] we delegate to find(), since that method will also search in the inner scopes!
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template<typename value_type>
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typename symtable_c<value_type>::value_t& symtable_c<value_type>::operator[] (const       char *identifier_str) {iterator i = find(identifier_str); return (i!=end())?i->second:_base[identifier_str];}
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template<typename value_type>
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typename symtable_c<value_type>::value_t& symtable_c<value_type>::operator[] (const std::string identifier_str) {iterator i = find(identifier_str); return (i!=end())?i->second:_base[identifier_str];}
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template<typename value_type>
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typename symtable_c<value_type>::iterator symtable_c<value_type>::end  (void) {return _base.end  ();}
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template<typename value_type>
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typename symtable_c<value_type>::iterator symtable_c<value_type>::begin(void) {return _base.begin();}
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/* returns end() if not found! */
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template<typename value_type>
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typename symtable_c<value_type>::iterator symtable_c<value_type>::find(const       char *identifier_str) {
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  iterator i;
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  if ((inner_scope != NULL) && ((i = inner_scope->find(identifier_str)) != inner_scope->end()))  // NOTE: must use the end() value of the inner scope!
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      return i;  // found in the lower level
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  /* if no lower level, or not found in lower level... */
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  return _base.find(identifier_str);
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}
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template<typename value_type>
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typename symtable_c<value_type>::iterator symtable_c<value_type>::find(const std::string identifier_str) {
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  iterator i;
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  if ((inner_scope != NULL) && ((i = inner_scope->find(identifier_str)) != inner_scope->end()))  // NOTE: must use the end() value of the inner scope!
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      return i;  // found in the lower level
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  /* if no lower level, or not found in lower level... */
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  return _base.find(identifier_str);
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}
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template<typename value_type>
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typename symtable_c<value_type>::iterator symtable_c<value_type>::find(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(name->value);
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}
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/* debuging function... */
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template<typename value_type>
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void symtable_c<value_type>::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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