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/*******************************************************************************
* Copyright (c) 2005, 2014 IBM Corporation 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:
* Andrew Niefer (IBM Corporation) - initial API and implementation
* Markus Schorn (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp;
import org.eclipse.cdt.core.dom.ast.DOMException;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTEqualsInitializer;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTInitializer;
import org.eclipse.cdt.core.dom.ast.IASTInitializerClause;
import org.eclipse.cdt.core.dom.ast.IASTName;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.IValue;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTInitializerList;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTParameterDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameterPackType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPScope;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateArgument;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateNonTypeParameter;
import org.eclipse.cdt.internal.core.dom.parser.ASTQueries;
import org.eclipse.cdt.internal.core.dom.parser.IntegralValue;
import org.eclipse.cdt.internal.core.dom.parser.ValueFactory;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPDependentEvaluation;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalBinding;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.TypeOfDependentExpression;
/**
* Binding for a non-type template parameter.
*/
public class CPPTemplateNonTypeParameter extends CPPTemplateParameter implements ICPPTemplateNonTypeParameter {
private IType type;
public CPPTemplateNonTypeParameter(IASTName name) {
super(name);
}
@Override
public IASTExpression getDefault() {
IASTInitializerClause def = getDefaultClause();
if (def instanceof IASTExpression) {
return (IASTExpression) def;
}
return null;
}
public IASTInitializerClause getDefaultClause() {
IASTName[] nds = getDeclarations();
if (nds == null || nds.length == 0)
return null;
for (IASTName name : nds) {
if (name != null) {
IASTNode parent = name.getParent();
assert parent instanceof IASTDeclarator;
if (parent instanceof IASTDeclarator) {
IASTDeclarator dtor = ASTQueries.findOutermostDeclarator((IASTDeclarator) parent);
IASTInitializer initializer = dtor.getInitializer();
if (initializer instanceof IASTEqualsInitializer) {
return ((IASTEqualsInitializer) initializer).getInitializerClause();
}
}
}
}
return null;
}
@Override
public ICPPTemplateArgument getDefaultValue() {
IASTInitializerClause dc = getDefault();
IASTExpression d = null;
if (dc instanceof IASTExpression) {
d = (IASTExpression) dc;
} else if (dc instanceof ICPPASTInitializerList) {
ICPPASTInitializerList list = (ICPPASTInitializerList) dc;
switch (list.getSize()) {
case 0:
return new CPPTemplateNonTypeArgument(IntegralValue.create(0), getType());
case 1:
dc = list.getClauses()[0];
if (dc instanceof IASTExpression) {
d = (IASTExpression) dc;
}
}
}
if (d == null)
return null;
IValue val = ValueFactory.create(d);
IType t = getType();
return new CPPTemplateNonTypeArgument(val, t);
}
@Override
public IType getType() {
if (type == null) {
IASTNode parent = getPrimaryDeclaration().getParent();
while (parent != null) {
if (parent instanceof ICPPASTParameterDeclaration) {
type = CPPVisitor.createType((ICPPASTParameterDeclaration) parent, true);
break;
}
parent = parent.getParent();
}
// C++17 template<auto>
if (type instanceof CPPPlaceholderType) {
CPPDependentEvaluation eval = new EvalBinding(this, null, getPrimaryDeclaration());
TypeOfDependentExpression replacementType = new TypeOfDependentExpression(eval);
replacementType.setForTemplateAuto(true);
type = replacementType;
}
}
return type;
}
@Override
public boolean isParameterPack() {
return getType() instanceof ICPPParameterPackType;
}
@Override
public boolean isStatic() {
return false;
}
@Override
public boolean isExtern() {
return false;
}
@Override
public boolean isAuto() {
return false;
}
@Override
public boolean isRegister() {
return false;
}
@Override
public IValue getInitialValue() {
return null;
}
@Override
public boolean isExternC() {
return false;
}
@Override
public boolean isMutable() {
return false;
}
@Override
public boolean isConstexpr() {
return false;
}
@Override
public ICPPScope asScope() throws DOMException {
// A non-type template parameter can never appear on the left hand side
// of a scope resolution operator.
return null;
}
}
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