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/*******************************************************************************
* Copyright (c) 2013, 2014 Nathan Ridge.
* 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:
* Nathan Ridge - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp.semantics;
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.IType;
import org.eclipse.cdt.core.dom.ast.IValue;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameterMap;
import org.eclipse.cdt.internal.core.dom.parser.DependentValue;
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.cpp.CPPParameterPackType;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPEvaluation;
import org.eclipse.cdt.internal.core.dom.parser.cpp.InstantiationContext;
import org.eclipse.core.runtime.CoreException;
/**
* Evaluation for a pack expansion expression.
*/
public class EvalPackExpansion extends CPPDependentEvaluation {
private ICPPEvaluation fExpansionPattern;
private IType fType;
public EvalPackExpansion(ICPPEvaluation expansionPattern, IASTNode pointOfDefinition) {
this(expansionPattern, findEnclosingTemplate(pointOfDefinition));
}
public EvalPackExpansion(ICPPEvaluation expansionPattern, IBinding templateDefinition) {
super(templateDefinition);
fExpansionPattern = expansionPattern;
}
public ICPPEvaluation getExpansionPattern() {
return fExpansionPattern;
}
@Override
public boolean isInitializerList() {
return fExpansionPattern.isInitializerList();
}
@Override
public boolean isFunctionSet() {
return fExpansionPattern.isFunctionSet();
}
@Override
public boolean isTypeDependent() {
return fExpansionPattern.isTypeDependent();
}
@Override
public boolean isValueDependent() {
return fExpansionPattern.isValueDependent();
}
@Override
public boolean isConstantExpression() {
return false;
}
@Override
public IType getType() {
if (fType == null) {
IType type = fExpansionPattern.getType();
if (type == null) {
fType= ProblemType.UNKNOWN_FOR_EXPRESSION;
} else {
fType= new CPPParameterPackType(type);
}
}
return fType;
}
@Override
public IValue getValue() {
return DependentValue.create(fExpansionPattern);
}
@Override
public ValueCategory getValueCategory() {
return ValueCategory.PRVALUE;
}
@Override
public ICPPEvaluation instantiate(InstantiationContext context, int maxDepth) {
ICPPEvaluation expansionPattern = fExpansionPattern.instantiate(context, maxDepth);
if (expansionPattern == fExpansionPattern)
return this;
return new EvalPackExpansion(expansionPattern, getTemplateDefinition());
}
@Override
public ICPPEvaluation computeForFunctionCall(ActivationRecord record, ConstexprEvaluationContext context) {
ICPPEvaluation expansionPattern = fExpansionPattern.computeForFunctionCall(record, context.recordStep());
if (expansionPattern == fExpansionPattern) {
return this;
}
EvalPackExpansion evalParamPack = new EvalPackExpansion(expansionPattern, getTemplateDefinition());
return evalParamPack;
}
@Override
public int determinePackSize(ICPPTemplateParameterMap tpMap) {
return CPPTemplates.PACK_SIZE_NOT_FOUND;
}
@Override
public boolean referencesTemplateParameter() {
return fExpansionPattern.referencesTemplateParameter();
}
@Override
public void marshal(ITypeMarshalBuffer buffer, boolean includeValue) throws CoreException {
buffer.putShort(ITypeMarshalBuffer.EVAL_PACK_EXPANSION);
buffer.marshalEvaluation(fExpansionPattern, includeValue);
marshalTemplateDefinition(buffer);
}
public static ICPPEvaluation unmarshal(short firstBytes, ITypeMarshalBuffer buffer) throws CoreException {
ICPPEvaluation expansionPattern = buffer.unmarshalEvaluation();
IBinding templateDefinition = buffer.unmarshalBinding();
return new EvalPackExpansion(expansionPattern, templateDefinition);
}
}
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