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/*******************************************************************************
* Copyright (c) 2016 Institute for Software, HSR Hochschule fuer Technik
* Rapperswil, University of applied sciences 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
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp.semantics;
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.IArrayType;
import org.eclipse.cdt.core.dom.ast.IBinding;
import org.eclipse.cdt.core.dom.ast.IField;
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.ICPPBasicType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameterMap;
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.ClassTypeHelper;
import org.eclipse.cdt.internal.core.dom.parser.cpp.ICPPEvaluation;
import org.eclipse.cdt.internal.core.dom.parser.cpp.InstantiationContext;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalFunctionCall.ParameterPackType;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
/**
* Represents an access to a sub-value of a composite value, identified by an index.
* Composite values can include arrays, structures, and parameter packs (see {@code CompositeValue}).
*/
public final class EvalCompositeAccess implements ICPPEvaluation {
private final ICPPEvaluation parent; // The composite value being accessed
private final int elementId; // The index of the sub-value being accessed
public EvalCompositeAccess(ICPPEvaluation parent, int elementId) {
Assert.isNotNull(parent);
this.parent = parent;
this.elementId = elementId;
}
public void update(ICPPEvaluation newValue) {
parent.getValue().setSubValue(elementId, newValue);
}
@Override
public boolean isInitializerList() {
return getTargetEvaluation().isInitializerList();
}
private ICPPEvaluation getTargetEvaluation() {
return parent.getValue().getSubValue(elementId);
}
@Override
public boolean isFunctionSet() {
return getTargetEvaluation().isFunctionSet();
}
@Override
public boolean isTypeDependent() {
return getTargetEvaluation().isTypeDependent();
}
@Override
public boolean isValueDependent() {
return getTargetEvaluation().isValueDependent();
}
@Override
public boolean isConstantExpression() {
return getTargetEvaluation().isConstantExpression();
}
@Override
public IType getType() {
IType type = getParent().getType();
type = SemanticUtil.getNestedType(type, TDEF | REF | CVTYPE);
if (type instanceof IArrayType) {
IArrayType arrayType = (IArrayType) type;
return arrayType.getType();
} else if (type instanceof InitializerListType) {
InitializerListType initListType = (InitializerListType) type;
ICPPEvaluation[] clauses = initListType.getEvaluation().getClauses();
if (elementId >= 0 && elementId < clauses.length) {
return clauses[elementId].getType();
} else {
return new ProblemType(ISemanticProblem.TYPE_UNKNOWN_FOR_EXPRESSION);
}
} else if (type instanceof ICPPClassType) {
ICPPClassType classType = (ICPPClassType) type;
IField[] fields = ClassTypeHelper.getFields(classType);
if (elementId >= 0 && elementId < fields.length) {
return fields[elementId].getType();
} else {
return new ProblemType(ISemanticProblem.TYPE_UNKNOWN_FOR_EXPRESSION);
}
} else if (type instanceof ParameterPackType) {
ParameterPackType parameterPackType = (ParameterPackType) type;
return parameterPackType.getTypes()[elementId];
} else if (type instanceof ICPPBasicType) {
return type;
}
return null;
}
@Override
public IValue getValue() {
return getTargetEvaluation().getValue();
}
@Override
public ValueCategory getValueCategory() {
return getTargetEvaluation().getValueCategory();
}
@Override
public char[] getSignature() {
return getTargetEvaluation().getSignature();
}
@Override
public ICPPEvaluation computeForFunctionCall(ActivationRecord record, ConstexprEvaluationContext context) {
if (getTargetEvaluation() != EvalFixed.INCOMPLETE) {
return getTargetEvaluation().computeForFunctionCall(record, context);
} else {
ICPPEvaluation evaluatedComposite = parent.computeForFunctionCall(record, context);
return evaluatedComposite.getValue().getSubValue(elementId).computeForFunctionCall(record, context);
}
}
@Override
public int determinePackSize(ICPPTemplateParameterMap tpMap) {
return getTargetEvaluation().determinePackSize(tpMap);
}
@Override
public boolean referencesTemplateParameter() {
return getTargetEvaluation().referencesTemplateParameter();
}
@Override
public IBinding getTemplateDefinition() {
return parent.getTemplateDefinition();
}
public ICPPEvaluation getParent() {
return parent;
}
public int getElementId() {
return elementId;
}
@Override
public ICPPEvaluation instantiate(InstantiationContext context, int maxDepth) {
return getTargetEvaluation().instantiate(context, maxDepth);
}
@Override
public void marshal(ITypeMarshalBuffer buffer, boolean includeValue) throws CoreException {
buffer.putShort(ITypeMarshalBuffer.EVAL_COMPOSITE_ACCESS);
buffer.marshalEvaluation(parent, includeValue);
buffer.putInt(elementId);
}
public static ICPPEvaluation unmarshal(short firstBytes, ITypeMarshalBuffer buffer) throws CoreException {
ICPPEvaluation parent = buffer.unmarshalEvaluation();
int elementId = buffer.getInt();
return new EvalCompositeAccess(parent, elementId);
}
}
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