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/*******************************************************************************
* Copyright (c) 2012 Wind River Systems, Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Markus Schorn - initial API and implementation
* Sergey Prigogin (Google)
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp.semantics;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_assign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_binaryAndAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_binaryOrAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_binaryXorAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_divideAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_equals;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_greaterEqual;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_greaterThan;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_lessEqual;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_lessThan;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_logicalAnd;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_logicalOr;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_minus;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_minusAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_moduloAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_multiplyAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_notequals;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_plus;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_plusAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_pmarrow;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_pmdot;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_shiftLeftAssign;
import static org.eclipse.cdt.core.dom.ast.IASTBinaryExpression.op_shiftRightAssign;
import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.LVALUE;
import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.PRVALUE;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.ExpressionTypes.glvalueType;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.ExpressionTypes.prvalueType;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.ExpressionTypes.prvalueTypeWithResolvedTypedefs;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.ExpressionTypes.typeFromFunctionCall;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.CVTYPE;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.REF;
import static org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil.TDEF;
import org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IPointerType;
import org.eclipse.cdt.core.dom.ast.ISemanticProblem;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.IValue;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassSpecialization;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunctionType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPPointerToMemberType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameterMap;
import org.eclipse.cdt.internal.core.dom.parser.ISerializableEvaluation;
import org.eclipse.cdt.internal.core.dom.parser.ITypeMarshalBuffer;
import org.eclipse.cdt.internal.core.dom.parser.ProblemType;
import org.eclipse.cdt.internal.core.dom.parser.Value;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPArithmeticConversion;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPBasicType;
import org.eclipse.cdt.internal.core.dom.parser.cpp.CPPFunction;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPEvaluation;
import org.eclipse.cdt.internal.core.dom.parser.cpp.OverloadableOperator;
import org.eclipse.core.runtime.CoreException;
/**
* Performs evaluation of an expression.
*/
public class EvalBinary extends CPPDependentEvaluation {
public final static int op_arrayAccess= Byte.MAX_VALUE;
private final int fOperator;
private final ICPPEvaluation fArg1;
private final ICPPEvaluation fArg2;
private ICPPFunction fOverload= CPPFunction.UNINITIALIZED_FUNCTION;
private IType fType;
public EvalBinary(int operator, ICPPEvaluation arg1, ICPPEvaluation arg2, IASTNode pointOfDefinition) {
this(operator, arg1, arg2, findEnclosingTemplate(pointOfDefinition));
}
public EvalBinary(int operator, ICPPEvaluation arg1, ICPPEvaluation arg2, IBinding templateDefinition) {
super(templateDefinition);
fOperator= operator;
fArg1= arg1;
fArg2= arg2;
}
public int getOperator() {
return fOperator;
}
public ICPPEvaluation getArg1() {
return fArg1;
}
public ICPPEvaluation getArg2() {
return fArg2;
}
@Override
public boolean isInitializerList() {
return false;
}
@Override
public boolean isFunctionSet() {
return false;
}
@Override
public IType getTypeOrFunctionSet(IASTNode point) {
if (fType == null) {
if (isTypeDependent()) {
fType= new TypeOfDependentExpression(this);
} else {
ICPPFunction overload = getOverload(point);
if (overload != null) {
fType= ExpressionTypes.restoreTypedefs(
ExpressionTypes.typeFromFunctionCall(overload),
fArg1.getTypeOrFunctionSet(point), fArg2.getTypeOrFunctionSet(point));
} else {
fType= computeType(point);
}
}
}
return fType;
}
@Override
public IValue getValue(IASTNode point) {
if (getOverload(point) != null) {
// TODO(sprigogin): Simulate execution of a function call.
return Value.create(this);
}
IValue v1 = fArg1.getValue(point);
if (v1 == Value.UNKNOWN)
return Value.UNKNOWN;
IValue v2 = fArg2.getValue(point);
if (v2 == Value.UNKNOWN)
return Value.UNKNOWN;
switch (fOperator) {
case op_equals:
if (v1.equals(v2))
return Value.create(1);
break;
case op_notequals:
if (v1.equals(v2))
return Value.create(0);
break;
}
Long num1 = v1.numericalValue();
if (num1 != null) {
if (num1 == 0) {
if (fOperator == op_logicalAnd)
return v1;
} else if (fOperator == op_logicalOr) {
return v1;
}
Long num2 = v2.numericalValue();
if (num2 != null) {
return Value.evaluateBinaryExpression(fOperator, num1, num2);
}
}
return Value.create(this);
}
@Override
public boolean isTypeDependent() {
if (fType != null) {
return fType instanceof TypeOfDependentExpression;
}
return fArg1.isTypeDependent() || fArg2.isTypeDependent();
}
@Override
public boolean isValueDependent() {
return fArg1.isValueDependent() || fArg2.isValueDependent();
}
@Override
public ValueCategory getValueCategory(IASTNode point) {
if (isTypeDependent())
return ValueCategory.PRVALUE;
ICPPFunction overload = getOverload(point);
if (overload != null)
return ExpressionTypes.valueCategoryFromFunctionCall(overload);
switch (fOperator) {
case op_arrayAccess:
case op_assign:
case op_binaryAndAssign:
case op_binaryOrAssign:
case op_binaryXorAssign:
case op_divideAssign:
case op_minusAssign:
case op_moduloAssign:
case op_multiplyAssign:
case op_plusAssign:
case op_shiftLeftAssign:
case op_shiftRightAssign:
return LVALUE;
case op_pmdot:
if (!(getTypeOrFunctionSet(point) instanceof ICPPFunctionType))
return fArg1.getValueCategory(point);
break;
case op_pmarrow:
if (!(getTypeOrFunctionSet(point) instanceof ICPPFunctionType))
return LVALUE;
break;
}
return ValueCategory.PRVALUE;
}
public ICPPFunction getOverload(IASTNode point) {
if (fOverload == CPPFunction.UNINITIALIZED_FUNCTION) {
fOverload= computeOverload(point);
}
return fOverload;
}
private ICPPFunction computeOverload(IASTNode point) {
if (isTypeDependent())
return null;
if (fOperator == op_arrayAccess) {
IType type = fArg1.getTypeOrFunctionSet(point);
type= SemanticUtil.getNestedType(type, TDEF | REF | CVTYPE);
if (type instanceof ICPPClassType) {
return CPPSemantics.findOverloadedBinaryOperator(point, getTemplateDefinitionScope(),
OverloadableOperator.BRACKET, fArg1, fArg2);
}
} else {
final OverloadableOperator op = OverloadableOperator.fromBinaryExpression(fOperator);
if (op != null) {
return CPPSemantics.findOverloadedBinaryOperator(point, getTemplateDefinitionScope(),
op, fArg1, fArg2);
}
}
return null;
}
public IType computeType(IASTNode point) {
// Check for overloaded operator.
ICPPFunction o= getOverload(point);
if (o != null)
return typeFromFunctionCall(o);
final IType originalType1 = fArg1.getTypeOrFunctionSet(point);
final IType type1 = prvalueTypeWithResolvedTypedefs(originalType1);
if (type1 instanceof ISemanticProblem) {
return type1;
}
final IType originalType2 = fArg2.getTypeOrFunctionSet(point);
final IType type2 = prvalueTypeWithResolvedTypedefs(originalType2);
if (type2 instanceof ISemanticProblem) {
return type2;
}
IType type= CPPArithmeticConversion.convertCppOperandTypes(fOperator, type1, type2);
if (type != null) {
return ExpressionTypes.restoreTypedefs(type, originalType1, originalType2);
}
switch (fOperator) {
case op_arrayAccess:
if (type1 instanceof IPointerType) {
return glvalueType(((IPointerType) type1).getType());
}
if (type2 instanceof IPointerType) {
return glvalueType(((IPointerType) type2).getType());
}
return ProblemType.UNKNOWN_FOR_EXPRESSION;
case op_lessEqual:
case op_lessThan:
case op_greaterEqual:
case op_greaterThan:
case op_logicalAnd:
case op_logicalOr:
case op_equals:
case op_notequals:
return CPPBasicType.BOOLEAN;
case op_plus:
if (type1 instanceof IPointerType) {
return ExpressionTypes.restoreTypedefs(type1, originalType1);
}
if (type2 instanceof IPointerType) {
return ExpressionTypes.restoreTypedefs(type2, originalType2);
}
break;
case op_minus:
if (type1 instanceof IPointerType) {
if (type2 instanceof IPointerType) {
return CPPVisitor.getPointerDiffType(point);
}
return originalType1;
}
break;
case op_pmarrow:
case op_pmdot:
if (type2 instanceof ICPPPointerToMemberType) {
IType t= ((ICPPPointerToMemberType) type2).getType();
if (t instanceof ICPPFunctionType)
return t;
if (fOperator == op_pmdot && fArg1.getValueCategory(point) == PRVALUE) {
return prvalueType(t);
}
return glvalueType(t);
}
return ProblemType.UNKNOWN_FOR_EXPRESSION;
}
return type1;
}
@Override
public void marshal(ITypeMarshalBuffer buffer, boolean includeValue) throws CoreException {
buffer.putByte(ITypeMarshalBuffer.EVAL_BINARY);
buffer.putByte((byte) fOperator);
buffer.marshalEvaluation(fArg1, includeValue);
buffer.marshalEvaluation(fArg2, includeValue);
marshalTemplateDefinition(buffer);
}
public static ISerializableEvaluation unmarshal(int firstByte, ITypeMarshalBuffer buffer) throws CoreException {
int op= buffer.getByte();
ICPPEvaluation arg1= (ICPPEvaluation) buffer.unmarshalEvaluation();
ICPPEvaluation arg2= (ICPPEvaluation) buffer.unmarshalEvaluation();
IBinding templateDefinition= buffer.unmarshalBinding();
return new EvalBinary(op, arg1, arg2, templateDefinition);
}
@Override
public ICPPEvaluation instantiate(ICPPTemplateParameterMap tpMap, int packOffset,
ICPPClassSpecialization within, int maxdepth, IASTNode point) {
ICPPEvaluation arg1 = fArg1.instantiate(tpMap, packOffset, within, maxdepth, point);
ICPPEvaluation arg2 = fArg2.instantiate(tpMap, packOffset, within, maxdepth, point);
if (arg1 == fArg1 && arg2 == fArg2)
return this;
return new EvalBinary(fOperator, arg1, arg2, getTemplateDefinition());
}
@Override
public ICPPEvaluation computeForFunctionCall(CPPFunctionParameterMap parameterMap,
int maxdepth, IASTNode point) {
ICPPEvaluation arg1 = fArg1.computeForFunctionCall(parameterMap, maxdepth, point);
ICPPEvaluation arg2 = fArg2.computeForFunctionCall(parameterMap, maxdepth, point);
if (arg1 == fArg1 && arg2 == fArg2)
return this;
return new EvalBinary(fOperator, arg1, arg2, getTemplateDefinition());
}
@Override
public int determinePackSize(ICPPTemplateParameterMap tpMap) {
return CPPTemplates.combinePackSize(fArg1.determinePackSize(tpMap), fArg2.determinePackSize(tpMap));
}
@Override
public boolean referencesTemplateParameter() {
return fArg1.referencesTemplateParameter() || fArg2.referencesTemplateParameter();
}
}
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