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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 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.ITypeMarshalBuffer;
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;
public class EvalReference extends CPPDependentEvaluation {
protected final ActivationRecord owningRecord;
// The following invariant must be true for instances of this class:
// (referredBinding == null) != (referredSubValue == null)
protected IBinding referredBinding;
protected EvalCompositeAccess referredSubValue;
public EvalReference(ActivationRecord owningRecord, IBinding referredBinding, IBinding templateDefinition) {
super(templateDefinition);
this.owningRecord = owningRecord;
this.referredBinding = referredBinding;
}
EvalReference(ActivationRecord owningRecord, IBinding referredBinding, IASTNode point) {
this(owningRecord, referredBinding, findEnclosingTemplate(point));
}
public EvalReference(ActivationRecord owningRecord, EvalCompositeAccess referredSubValue, IBinding templateDefinition) {
super(templateDefinition);
this.owningRecord = owningRecord;
this.referredSubValue = referredSubValue;
this.referredBinding = null;
}
EvalReference(ActivationRecord owningRecord, EvalCompositeAccess referredSubValue, IASTNode point) {
this(owningRecord, referredSubValue, findEnclosingTemplate(point));
}
public ActivationRecord getOwningRecord() {
return owningRecord;
}
public EvalCompositeAccess getReferredSubValue() {
return referredSubValue;
}
@Override
public final boolean isInitializerList() {
return getTargetEvaluation().isInitializerList();
}
@Override
public final boolean isFunctionSet() {
return getTargetEvaluation().isFunctionSet();
}
@Override
public final boolean isTypeDependent() {
return getTargetEvaluation().isTypeDependent();
}
@Override
public final boolean isValueDependent() {
return getTargetEvaluation().isValueDependent();
}
@Override
public final boolean isConstantExpression() {
return getTargetEvaluation().isConstantExpression();
}
@Override
public IType getType() {
return getTargetEvaluation().getType();
}
@Override
public IValue getValue() {
return getTargetEvaluation().getValue();
}
public final ICPPEvaluation getTargetEvaluation() {
if (referredSubValue != null) {
return referredSubValue;
}
ICPPEvaluation targetValue = owningRecord.getVariable(referredBinding);
return targetValue == null ? EvalFixed.INCOMPLETE : targetValue;
}
public void update(ICPPEvaluation eval) {
if (referredBinding != null) {
ICPPEvaluation oldValue = owningRecord.getVariable(referredBinding);
if (oldValue instanceof EvalReference) {
((EvalReference) oldValue).update(eval);
} else {
owningRecord.update(referredBinding, eval);
}
} else {
referredSubValue.update(eval);
}
}
public final IBinding getReferredBinding() {
return referredBinding;
}
@Override
public ValueCategory getValueCategory() {
// An EvalReference always refers to a named variable, so its value category is lvalue.
return ValueCategory.LVALUE;
}
@Override
public ICPPEvaluation computeForFunctionCall(ActivationRecord record, ConstexprEvaluationContext context) {
if (referredSubValue != null) {
return referredSubValue.computeForFunctionCall(record, context);
}
ICPPEvaluation referredEval = owningRecord.getVariable(referredBinding);
if (referredEval instanceof EvalReference) {
// TODO(nathanridge): Why are we doing this for EvalReference only?
return referredEval.computeForFunctionCall(record, context);
}
return referredEval;
}
@Override
public int determinePackSize(ICPPTemplateParameterMap tpMap) {
return getTargetEvaluation().determinePackSize(tpMap);
}
@Override
public boolean referencesTemplateParameter() {
return getTargetEvaluation().referencesTemplateParameter();
}
@Override
public ICPPEvaluation instantiate(InstantiationContext context, int maxDepth) {
// TODO(nathanridge): Why are we losing the EvalReference wrapper here?
return getTargetEvaluation().instantiate(context, maxDepth);
}
@Override
public void marshal(ITypeMarshalBuffer buffer, boolean includeValue) throws CoreException {
short firstBytes = ITypeMarshalBuffer.EVAL_REFERENCE;
if (referredSubValue != null) {
firstBytes |= ITypeMarshalBuffer.FLAG1;
}
buffer.putShort(firstBytes);
if (referredSubValue != null) {
buffer.marshalEvaluation(referredSubValue, includeValue);
} else {
buffer.marshalBinding(referredBinding);
buffer.marshalEvaluation(owningRecord.getVariable(referredBinding), includeValue);
}
marshalTemplateDefinition(buffer);
}
public static ICPPEvaluation unmarshal(short firstBytes, ITypeMarshalBuffer buffer) throws CoreException {
boolean subValue = (firstBytes & ITypeMarshalBuffer.FLAG1) != 0;
if (subValue) {
EvalCompositeAccess referredSubValue = (EvalCompositeAccess) buffer.unmarshalEvaluation();
IBinding templateDefinition = buffer.unmarshalBinding();
return new EvalReference(new ActivationRecord(), referredSubValue, templateDefinition);
} else {
IBinding referredBinding = buffer.unmarshalBinding();
ICPPEvaluation value = buffer.unmarshalEvaluation();
ActivationRecord record = new ActivationRecord();
record.update(referredBinding, value);
IBinding templateDefinition = buffer.unmarshalBinding();
return new EvalReference(record, referredBinding, templateDefinition);
}
}
}
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