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/* $Id$
*
* Symbol: A symbol refers to a named entity.
*
* Copyright (C) 2007-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#include "frontend/misc/Symbol.hpp"
#include "frontend/misc/DeclarativeRegion.hpp"
#include "frontend/ast/FunctionDeclaration.hpp"
#include "frontend/visitor/ResolveTypes.hpp"
namespace ast {
/*
* same name and:
* <= 1 is overloadable -> true
* 2 is overloadable and
* same parameter/result type profile -> true
* falltrhough: false
*/
bool
Symbol::isHomograph(const Symbol& other) const {
if (*(this->name) != *(other.name)) {
return false;
}
unsigned int overloadable = SYMBOL_FUNCTION | SYMBOL_PROCEDURE;
if ((this->type | other.type | overloadable) != overloadable) {
//at most one is overloadable
//i.o.w: at least on is not overloadable
return true;
}
//both are overloadable
//are both procedures?
if ((this->type | other.type) == SYMBOL_PROCEDURE) {
return this->sameParameterProfile(other);
}
//is only one a procedure?
if (((this->type | other.type) & SYMBOL_PROCEDURE) != 0) {
// cannot match on result type profile -> not homographic
return false;
}
//are both functions?
if ((this->type | other.type) == SYMBOL_FUNCTION) {
bool ret = this->sameResultProfile(other);
ret = ret && this->sameParameterProfile(other);
return ret;
}
// not overloadable: -> homographs.
return false;
}
bool
Symbol::sameParameterProfile(const Symbol& other) const
{
Callable* c1 = dynamic_cast<Callable*>(&this->declaration);
Callable* c2 = dynamic_cast<Callable*>(&other.declaration);
assert(c1);
assert(c2);
if (c1->arguments == NULL) {
return c2->arguments == NULL;
}
if (c2->arguments == NULL) {
return false;
}
if (c1->arguments->size() != c2->arguments->size()) {
return false;
}
std::list<ValDeclaration*>::const_iterator i = c1->arguments->begin();
std::list<ValDeclaration*>::const_iterator j = c2->arguments->begin();
// check base type of subtype of both
while ((i != c1->arguments->end()) && (j != c2->arguments->end())) {
assert((*i)->subtypeIndic);
assert((*j)->subtypeIndic);
if (! this->baseTypeEqual(
*(*i)->subtypeIndic,
*(*j)->subtypeIndic)) {
return false;
}
i++; j++;
}
// same number of parameters?
return true;
}
bool
Symbol::sameResultProfile(const Symbol& other) const
{
FunctionDeclaration *f1 =
dynamic_cast<FunctionDeclaration*>(&this->declaration);
FunctionDeclaration *f2 =
dynamic_cast<FunctionDeclaration*>(&other.declaration);
assert(f1);
assert(f2);
// there must have been a compile error, otherwise the
// returnType s must have been set.
if (f1->returnType == NULL) {
return false;
}
if (f2->returnType == NULL) {
return false;
}
return this->baseTypeEqual(*(f1->returnType), *(f2->returnType));
}
bool
Symbol::baseTypeEqual(
const SubtypeIndication& s1,
const SubtypeIndication& s2
)
{
// must have thrown an error during resolving.
if (s1.declaration == NULL) {
return false;
}
// must have thrown an error during resolving.
if (s2.declaration == NULL) {
return false;
}
return ResolveTypes::baseTypeEqual(*s1.declaration,
*s2.declaration);
}
void
Symbol::put(std::ostream& stream) const
{
stream << *name << ": ";
switch(this->type) {
case SYMBOL_ENTITY:
stream << "Entity";
break;
case SYMBOL_PROCEDURE:
stream << "Procedure";
break;
case SYMBOL_FUNCTION:
stream << "Function";
break;
case SYMBOL_SIGNAL:
stream << "Signal";
break;
case SYMBOL_VARIABLE:
stream << "Variable/Constant";
break;
case SYMBOL_TYPE:
stream << "Type";
break;
case SYMBOL_UNIT:
stream << "Physical Unit";
break;
case SYMBOL_ELEMENT:
stream << "Record element";
break;
case SYMBOL_ATTRIBUTE:
stream << "Attribute";
break;
case SYMBOL_ARCHITECTURE:
stream << "Architecture";
break;
case SYMBOL_PROCESS:
stream << "Process";
break;
case SYMBOL_LOOP:
stream << "Loop";
break;
case SYMBOL_LIBRARY:
stream << "Library";
break;
case SYMBOL_PACKAGE:
stream << "Package";
break;
case SYMBOL_ALL:
stream << "ALL token";
break;
case SYMBOL_PARAMETER:
stream << "Parameter";
break;
case SYMBOL_PORT:
stream << "Port";
break;
}
}
std::ostream& operator<<(std::ostream& stream, const Symbol& sym)
{
sym.put(stream);
return stream;
}
}; /* namespace ast */
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