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/* This file is part of KDevelop
Copyright 2008 David Nolden <david.nolden.kdevelop@art-master.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "builtinoperators.h"
#include "cpptypes.h"
#include <language/duchain/types/constantintegraltype.h>
#include "parser/tokens.h"
using namespace KDevelop;
/** A helper-class for evaluating constant binary expressions under different types(int, float, etc.) */
template<class Type>
struct ConstantBinaryExpressionEvaluator {
Type endValue;
uint type;
uint modifier;
/**
* Writes the results into endValue, type, and modifier.
* */
ConstantBinaryExpressionEvaluator( uint _type, uint _modifier, int tokenKind, ConstantIntegralType* left, ConstantIntegralType* right ) {
endValue = 0;
type = _type;
modifier = _modifier;
evaluateSpecialTokens(tokenKind, left, right);
switch( tokenKind ) {
case '+':
endValue = left->ConstantIntegralType::value<Type>() + right->ConstantIntegralType::value<Type>();
break;
case '-':
endValue = left->ConstantIntegralType::value<Type>() - right->ConstantIntegralType::value<Type>();
break;
case '*':
endValue = left->ConstantIntegralType::value<Type>() * right->ConstantIntegralType::value<Type>();
break;
case '/':
if(right->ConstantIntegralType::value<Type>())
endValue = left->ConstantIntegralType::value<Type>() / right->ConstantIntegralType::value<Type>();
else
kDebug() << "bad division operator" << left->ConstantIntegralType::value<Type>() << "/" << right->ConstantIntegralType::value<Type>();
break;
case '=':
endValue = right->ConstantIntegralType::value<Type>();
break;
case '<':
endValue = left->ConstantIntegralType::value<Type>() < right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
case '>':
endValue = left->ConstantIntegralType::value<Type>() > right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
case Token_assign:
endValue = right->ConstantIntegralType::value<Type>();
break;
case Token_eq:
endValue = left->ConstantIntegralType::value<Type>() == right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
case Token_not_eq:
endValue = left->ConstantIntegralType::value<Type>() != right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
case Token_leq:
endValue = left->ConstantIntegralType::value<Type>() <= right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
case Token_geq:
endValue = left->ConstantIntegralType::value<Type>() >= right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
}
}
//This function is used to disable some operators on bool and double values
void evaluateSpecialTokens( int tokenKind, ConstantIntegralType* left, ConstantIntegralType* right ) {
switch( tokenKind ) {
case '%':
if(right->ConstantIntegralType::value<Type>())
endValue = left->ConstantIntegralType::value<Type>() % right->ConstantIntegralType::value<Type>();
else
kDebug() << "bad modulo operator" << left->ConstantIntegralType::value<Type>() << "%" << right->ConstantIntegralType::value<Type>();
break;
case '^':
endValue = left->ConstantIntegralType::value<Type>() ^ right->ConstantIntegralType::value<Type>();
break;
case '&':
endValue = left->ConstantIntegralType::value<Type>() & right->ConstantIntegralType::value<Type>();
break;
case '|':
endValue = left->ConstantIntegralType::value<Type>() | right->ConstantIntegralType::value<Type>();
break;
case Token_leftshift:
endValue = left->ConstantIntegralType::value<Type>() << right->ConstantIntegralType::value<Type>();
break;
case Token_rightshift:
endValue = left->ConstantIntegralType::value<Type>() >> right->ConstantIntegralType::value<Type>();
break;
case Token_and:
endValue = left->ConstantIntegralType::value<Type>() && right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
case Token_or:
endValue = left->ConstantIntegralType::value<Type>() || right->ConstantIntegralType::value<Type>();
type = IntegralType::TypeBoolean;
break;
}
}
AbstractType::Ptr createType() {
ConstantIntegralType::Ptr ret( new ConstantIntegralType(type) );
ret->setModifiers(ret->modifiers() & modifier);
ret->ConstantIntegralType::setValue<Type>( endValue );
return AbstractType::Ptr::staticCast(ret);
}
};
template<>
void ConstantBinaryExpressionEvaluator<double>::evaluateSpecialTokens( int tokenKind, ConstantIntegralType* left, ConstantIntegralType* right ) {
Q_UNUSED(tokenKind);
Q_UNUSED(left);
Q_UNUSED(right);
}
template<>
void ConstantBinaryExpressionEvaluator<float>::evaluateSpecialTokens( int tokenKind, ConstantIntegralType* left, ConstantIntegralType* right ) {
Q_UNUSED(tokenKind);
Q_UNUSED(left);
Q_UNUSED(right);
}
AbstractType::Ptr binaryOperatorReturnType(AbstractType::Ptr left, AbstractType::Ptr right, int tokenKind) {
if(!left || !right)
return AbstractType::Ptr();
IntegralType* leftIntegral = dynamic_cast<IntegralType*>(left.unsafeData());
IntegralType* rightIntegral = dynamic_cast<IntegralType*>(right.unsafeData());
PointerType* leftPointer = dynamic_cast<PointerType*>(right.unsafeData());
AbstractType::Ptr ret;
//Constantly evaluate integral expressions
ConstantIntegralType* leftConstantIntegral = dynamic_cast<ConstantIntegralType*>(left.unsafeData());
ConstantIntegralType* rightConstantIntegral = dynamic_cast<ConstantIntegralType*>(right.unsafeData());
if(leftIntegral && rightIntegral) {
if(tokenKind == '+' || tokenKind == '-' || tokenKind == '*' || tokenKind == '/' || tokenKind == '%' || tokenKind == '^' || tokenKind == '&' || tokenKind == '|' || tokenKind == '~' || tokenKind == Token_leftshift || tokenKind == Token_rightshift) {
if(moreExpressiveThan(leftIntegral, rightIntegral))
ret = left;
else
ret = right;
}
if(tokenKind == '<' || tokenKind == '>' || tokenKind == Token_eq || tokenKind == Token_not_eq || tokenKind == Token_leq || tokenKind == Token_geq || tokenKind == Token_not_eq || tokenKind == Token_and || tokenKind == Token_or)
ret = AbstractType::Ptr(new IntegralType(IntegralType::TypeBoolean));
}
if(leftPointer && rightIntegral && (tokenKind == '+' || tokenKind == '-'))
ret = left;
IntegralType* retIntegral = dynamic_cast<IntegralType*>(ret.unsafeData());
///We have determined the resulting type now. If both sides are constant, also evaluate the resulting value.
if(ret && retIntegral && leftConstantIntegral && rightConstantIntegral) {
switch( retIntegral->dataType() ) {
case IntegralType::TypeFloat:
{
ConstantBinaryExpressionEvaluator<float> evaluator( retIntegral->dataType(), retIntegral->modifiers(), tokenKind, leftConstantIntegral, rightConstantIntegral );
return evaluator.createType();
}
case IntegralType::TypeDouble:
{
ConstantBinaryExpressionEvaluator<double> evaluator( retIntegral->dataType(), retIntegral->modifiers(), tokenKind, leftConstantIntegral, rightConstantIntegral );
return evaluator.createType();
}
default:
if( leftConstantIntegral->modifiers() & AbstractType::UnsignedModifier ) {
ConstantBinaryExpressionEvaluator<quint64> evaluator( retIntegral->dataType(), retIntegral->modifiers(), tokenKind, leftConstantIntegral, rightConstantIntegral);
return evaluator.createType();
} else {
ConstantBinaryExpressionEvaluator<qint64> evaluator( retIntegral->dataType(), retIntegral->modifiers(), tokenKind, leftConstantIntegral, rightConstantIntegral);
return evaluator.createType();
}
break;
}
}
return ret;
}
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