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/*******************************************************************************
* Copyright (c) 2016 Google, Inc and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Sergey Prigogin (Google) - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp.semantics;
import java.util.Arrays;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateArgument;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameterMap;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTypeSpecialization;
import org.eclipse.cdt.core.parser.util.CharArrayUtils;
import org.eclipse.cdt.internal.core.dom.parser.cpp.InstantiationContext;
import org.eclipse.core.runtime.CoreException;
/**
* Used to track ongoing instantiations as a safeguard against infinite recursion.
*/
public class TypeInstantiationRequest {
private final IType type;
private final ICPPTemplateParameterMap parameterMap;
private final int packOffset;
private final ICPPTypeSpecialization contextTypeSpecialization;
private int hashCode;
public TypeInstantiationRequest(IType type, InstantiationContext context) {
this.type = type;
this.parameterMap = context.getParameterMap();
this.packOffset = context.getPackOffset();
this.contextTypeSpecialization = context.getContextTypeSpecialization();
}
@Override
public int hashCode() {
if (hashCode == 0) {
SignatureBuilder builder = new SignatureBuilder();
try {
builder.marshalType(type);
char[] signature = builder.getSignature();
hashCode = CharArrayUtils.hash(signature);
} catch (CoreException e) {
CCorePlugin.log(e);
hashCode = Integer.MIN_VALUE;
}
}
return hashCode;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!getClass().equals(obj.getClass()))
return false;
TypeInstantiationRequest other = (TypeInstantiationRequest) obj;
if (!type.isSameType(other.type))
return false;
if (!equals(contextTypeSpecialization, other.contextTypeSpecialization))
return false;
if (!equals(parameterMap, other.parameterMap))
return false;
if (packOffset != other.packOffset)
return false;
return true;
}
private boolean equals(IType type1, IType type2) {
if (type1 == type2)
return true;
if (type1 == null || type2 == null)
return false;
return type1.isSameType(type1);
}
private boolean equals(ICPPTemplateParameterMap map1, ICPPTemplateParameterMap map2) {
if (map1 == map2)
return true;
if (map1 == null || map2 == null)
return false;
Integer[] p1 = map1.getAllParameterPositions();
Integer[] p2 = map2.getAllParameterPositions();
if (!Arrays.equals(p1, p2))
return false;
for (Integer paramId : p1) {
ICPPTemplateArgument[] packExpansion1 = map1.getPackExpansion(paramId);
ICPPTemplateArgument[] packExpansion2 = map2.getPackExpansion(paramId);
if (packExpansion1 != null && packExpansion2 != null) {
if (packExpansion1.length != packExpansion2.length)
return false;
for (int i = 0; i < packExpansion1.length; i++) {
if (!equals(packExpansion1[i], packExpansion2[i]))
return false;
}
} else if (packExpansion1 == null && packExpansion2 == null) {
ICPPTemplateArgument arg1 = map1.getArgument(paramId);
ICPPTemplateArgument arg2 = map2.getArgument(paramId);
if (!equals(arg1, arg2))
return false;
} else {
return false;
}
}
return true;
}
private boolean equals(ICPPTemplateArgument arg1, ICPPTemplateArgument arg2) {
if (arg1 == arg2)
return true;
if (arg1 == null || arg2 == null)
return false;
return arg1.isSameValue(arg2);
}
}
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