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/*******************************************************************************
* Copyright (c) 2007, 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 Ferguson (Symbian) - initial API and implementation
* Markus Schorn (Wind River Systems)
* Sergey Prigogin (Google)
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp;
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.IASTDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTFunctionDefinition;
import org.eclipse.cdt.core.dom.ast.IASTParameterDeclaration;
import org.eclipse.cdt.core.dom.ast.IASTSimpleDeclSpecifier;
import org.eclipse.cdt.core.dom.ast.IASTSimpleDeclaration;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTCompositeTypeSpecifier;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionDeclarator;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTParameterDeclaration;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPBase;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPConstructor;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPReferenceType;
import org.eclipse.cdt.core.parser.util.CharArrayUtils;
import org.eclipse.cdt.internal.core.dom.parser.ASTQueries;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil;
/**
* Helps analysis of the class declaration for user declared members relevant for deciding
* which implicit bindings to declare.
*
* @see chapter 12 of the ISO specification
*/
final class ImplicitsAnalysis {
private final ICPPClassType classType;
private boolean hasConstructor;
private boolean hasCopyConstructor;
private boolean hasCopyAssignmentOperator;
private boolean hasDestructor;
private boolean hasNonStaticFields;
ImplicitsAnalysis(ICPPASTCompositeTypeSpecifier compositeTypeSpecifier, ICPPClassType classType) {
this.classType = classType;
analyzeMembers(compositeTypeSpecifier);
}
public boolean hasUserDeclaredConstructor() {
return hasConstructor;
}
public boolean hasUserDeclaredCopyConstructor() {
return hasCopyConstructor;
}
public boolean hasUserDeclaredCopyAssignmentOperator() {
return hasCopyAssignmentOperator;
}
public boolean hasUserDeclaredDestructor() {
return hasDestructor;
}
/**
* Returns the number of implicit methods to declare not counting the inherited constructors.
*/
public int getImplicitsToDeclareCount() {
return (!hasDestructor ? 1 : 0) + (!hasConstructor ? 1 : 0) + (!hasCopyConstructor ? 1 : 0)
+ (!hasCopyAssignmentOperator ? 1 : 0);
}
private void analyzeMembers(ICPPASTCompositeTypeSpecifier compositeTypeSpecifier) {
IASTDeclaration[] members = compositeTypeSpecifier.getMembers();
char[] name = compositeTypeSpecifier.getName().getLookupKey();
for (IASTDeclaration member : members) {
IASTDeclarator dcltor = null;
IASTDeclSpecifier spec = null;
if (member instanceof IASTSimpleDeclaration) {
IASTDeclarator[] dtors = ((IASTSimpleDeclaration) member).getDeclarators();
if (dtors.length != 1)
continue;
dcltor = dtors[0];
spec = ((IASTSimpleDeclaration) member).getDeclSpecifier();
} else if (member instanceof IASTFunctionDefinition) {
dcltor = ((IASTFunctionDefinition) member).getDeclarator();
spec = ((IASTFunctionDefinition) member).getDeclSpecifier();
}
if (!(dcltor instanceof ICPPASTFunctionDeclarator))
continue;
char[] declName = ASTQueries.findInnermostDeclarator(dcltor).getName().getLookupKey();
if (spec instanceof IASTSimpleDeclSpecifier
&& ((IASTSimpleDeclSpecifier) spec).getType() == IASTSimpleDeclSpecifier.t_unspecified) {
if (CharArrayUtils.equals(declName, name)) {
hasConstructor = true;
IASTParameterDeclaration[] params = ((ICPPASTFunctionDeclarator) dcltor).getParameters();
if (params.length != 0 && hasTypeReferenceToClassType(params[0])
&& parametersHaveInitializers(params, 1)) {
hasCopyConstructor = true;
}
} else if (declName.length != 0 && declName[0] == '~'
&& CharArrayUtils.equals(declName, 1, name.length, name)) {
hasDestructor = true;
}
} else if (CharArrayUtils.equals(declName, OverloadableOperator.ASSIGN.toCharArray())) {
IASTParameterDeclaration[] params = ((ICPPASTFunctionDeclarator) dcltor).getParameters();
if (params.length == 1 && hasTypeReferenceToClassType(params[0]))
hasCopyAssignmentOperator = true;
}
if (hasCopyConstructor && hasDestructor && hasCopyAssignmentOperator)
break;
}
}
private boolean hasTypeReferenceToClassType(IASTParameterDeclaration decl) {
if (decl instanceof ICPPASTParameterDeclaration) {
IType t = CPPVisitor.createType((ICPPASTParameterDeclaration) decl, false);
if (t != null) {
t = SemanticUtil.getNestedType(t, TDEF);
if (t instanceof ICPPReferenceType && !((ICPPReferenceType) t).isRValueReference()) {
t = SemanticUtil.getNestedType(t, TDEF | REF | CVTYPE);
return classType.isSameType(t);
}
}
}
return false;
}
/**
* Checks whether all parameters starting at offset have initializers.
*/
private boolean parametersHaveInitializers(IASTParameterDeclaration[] params, int offset) {
for (int i = offset; i < params.length; i++) {
if (params[i].getDeclarator().getInitializer() == null)
return false;
}
return true;
}
public boolean isDefaultConstructorConstexpr() {
// The following condition is stronger than necessary. It is sufficient if the class doesn't contain
// non-static fields that don't have constexpr default constructors.
// TODO(sprigogin): Relax the condition in accordance with [dcl.constexpr] 7.1.5-4.
if (hasNonStaticFields)
return false;
ICPPBase[] bases = classType.getBases();
for (ICPPBase base : bases) {
if (base.isVirtual())
return false;
}
ICPPClassType[] baseClasses = ClassTypeHelper.getAllBases(classType);
for (ICPPClassType baseClass : baseClasses) {
ICPPConstructor ctor = getDefaultConstructor(baseClass);
if (ctor == null || !ctor.isConstexpr())
return false;
}
return true;
}
/**
* Returns a user-defined or implicit default constructor for the given class.
*/
private static ICPPConstructor getDefaultConstructor(ICPPClassType classType) {
for (ICPPConstructor ctor : classType.getConstructors()) {
if (ClassTypeHelper.getMethodKind(classType, ctor) == ClassTypeHelper.MethodKind.DEFAULT_CTOR)
return ctor;
}
return null;
}
}
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