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/*
* Copyright 2007-2014 Adrian Thurston <thurston@complang.org>
*/
/* This file is part of Colm.
*
* Colm 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 2 of the License, or
* (at your option) any later version.
*
* Colm 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 Colm; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "bytecode.h"
#include "parsedata.h"
#include <iostream>
#include <assert.h>
using std::cout;
using std::cerr;
using std::endl;
ObjectDef *UniqueType::objectDef()
{
if ( typeId != TYPE_TREE && typeId != TYPE_REF ) {
/* This should have generated a compiler error. */
assert(false);
}
return langEl->objectDef;
}
/* Recurisve find through a single object def's scope. */
ObjectField *ObjectDef::findFieldInScope( const ObjNameScope *inScope, const String &name ) const
{
ObjFieldMapEl *objDefMapEl = inScope->objFieldMap->find( name );
if ( objDefMapEl != 0 )
return objDefMapEl->value;
if ( inScope->parentScope != 0 )
return findFieldInScope( inScope->parentScope, name );
return 0;
}
ObjectField *ObjNameScope::findField( const String &name ) const
{
return owner->findFieldInScope( this, name );
}
ObjMethod *ObjectDef::findMethod( const String &name ) const
{
ObjMethodMapEl *objMethodMapEl = objMethodMap->find( name );
if ( objMethodMapEl != 0 )
return objMethodMapEl->value;
return 0;
}
VarRefLookup LangVarRef::lookupQualification( Compiler *pd, ObjNameScope *rootScope ) const
{
int lastPtrInQual = -1;
ObjNameScope *searchScope = rootScope;
int firstConstPart = -1;
for ( QualItemVect::Iter qi = *qual; qi.lte(); qi++ ) {
/* Lookup the field int the current qualification. */
ObjectField *el = searchScope->findField( qi->data );
if ( el == 0 )
error(qi->loc) << "cannot resolve qualification " << qi->data << endp;
/* Lookup the type of the field. */
el->typeRef->resolveType( pd );
UniqueType *qualUT = el->typeRef->uniqueType;
/* If we are dealing with an iterator then dereference it. */
if ( qualUT->typeId == TYPE_ITER )
qualUT = el->typeRef->searchUniqueType;
/* Is it const? */
if ( firstConstPart < 0 && el->isConst )
firstConstPart = qi.pos();
/* Check for references. When loop is done we will have the last one
* present, if any. */
if ( qualUT->typeId == TYPE_PTR )
lastPtrInQual = qi.pos();
if ( qi->form == QualItem::Dot ) {
/* Cannot dot a reference. Iterator yes (access of the iterator
* not the current) */
if ( qualUT->typeId == TYPE_PTR )
error(loc) << "dot cannot be used to access a pointer" << endp;
}
else if ( qi->form == QualItem::Arrow ) {
if ( qualUT->typeId == TYPE_ITER )
qualUT = el->typeRef->searchUniqueType;
else if ( qualUT->typeId == TYPE_PTR )
qualUT = pd->findUniqueType( TYPE_TREE, qualUT->langEl );
}
ObjectDef *searchObjDef = qualUT->objectDef();
searchScope = searchObjDef->rootScope;
}
return VarRefLookup( lastPtrInQual, firstConstPart, searchScope->owner, searchScope );
}
bool LangVarRef::isLocalRef() const
{
if ( qual->length() > 0 ) {
if ( scope->findField( qual->data[0].data ) != 0 )
return true;
}
else if ( scope->findField( name ) != 0 )
return true;
else if ( scope->owner->findMethod( name ) != 0 )
return true;
return false;
}
bool LangVarRef::isContextRef() const
{
if ( context != 0 ) {
if ( qual->length() > 0 ) {
if ( context->contextObjDef->rootScope->findField( qual->data[0].data ) != 0 )
return true;
}
else if ( context->contextObjDef->rootScope->findField( name ) != 0 )
return true;
else if ( context->contextObjDef->findMethod( name ) != 0 )
return true;
}
return false;
}
bool LangVarRef::isCustom() const
{
if ( qual->length() > 0 ) {
ObjectField *field = scope->findField( qual->data[0].data );
if ( field != 0 && field->isCustom )
return true;
}
else {
ObjectField *field = scope->findField( name );
if ( field != 0 ) {
if ( field->isCustom )
return true;
}
else {
ObjMethod *method = scope->owner->findMethod( name );
if ( method != 0 && method->isCustom )
return true;
}
}
return false;
}
VarRefLookup LangVarRef::lookupObj( Compiler *pd ) const
{
ObjNameScope *rootScope;
if ( isLocalRef() )
rootScope = scope;
else if ( isContextRef() )
rootScope = context->contextObjDef->rootScope;
else
rootScope = pd->globalObjectDef->rootScope;
return lookupQualification( pd, rootScope );
}
VarRefLookup LangVarRef::lookupField( Compiler *pd ) const
{
/* Lookup the object that the field is in. */
VarRefLookup lookup = lookupObj( pd );
/* Lookup the field. */
ObjectField *field = lookup.inScope->findField( name );
if ( field == 0 )
error(loc) << "cannot find name " << name << " in object" << endp;
lookup.objField = field;
lookup.uniqueType = field->typeRef->uniqueType;
if ( field->typeRef->searchUniqueType != 0 )
lookup.iterSearchUT = field->typeRef->searchUniqueType;
return lookup;
}
UniqueType *LangVarRef::lookup( Compiler *pd ) const
{
/* Lookup the loadObj. */
VarRefLookup lookup = lookupField( pd );
ObjectField *el = lookup.objField;
UniqueType *elUT = el->typeRef->resolveType( pd );
/* Deref iterators. */
if ( elUT->typeId == TYPE_ITER )
elUT = el->typeRef->searchUniqueType;
return elUT;
}
VarRefLookup LangVarRef::lookupMethod( Compiler *pd ) const
{
/* Lookup the object that the field is in. */
VarRefLookup lookup = lookupObj( pd );
/* Find the method. */
assert( lookup.inObject->objMethodMap != 0 );
ObjMethod *method = lookup.inObject->findMethod( name );
if ( method == 0 ) {
/* Not found as a method, try it as an object on which we will call a
* default function. */
qual->append( QualItem( QualItem::Dot, loc, name ) );
/* Lookup the object that the field is in. */
VarRefLookup lookup = lookupObj( pd );
/* Find the method. */
assert( lookup.inObject->objMethodMap != 0 );
method = lookup.inObject->findMethod( "finish" );
if ( method == 0 )
error(loc) << "cannot find " << name << "(...) in object" << endp;
}
lookup.objMethod = method;
lookup.uniqueType = method->returnUT;
return lookup;
}
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