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/*******************************************************************************
* Copyright (c) 2011 Google, Inc 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
*
* Contributors:
* Sergey Prigogin (Google) - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.core.dom.rewrite;
import org.eclipse.cdt.core.dom.ast.IASTDeclarator;
import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.ICompositeType;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTTranslationUnit;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassType;
import org.eclipse.cdt.internal.core.dom.parser.ASTTranslationUnit;
import org.eclipse.cdt.internal.core.dom.parser.SizeofCalculator;
import org.eclipse.cdt.internal.core.dom.parser.SizeofCalculator.SizeAndAlignment;
import org.eclipse.cdt.internal.core.dom.parser.c.CVisitor;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.SemanticUtil;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.TypeTraits;
/**
* A collection of static methods related to types.
* @since 5.4
*/
public class TypeHelper {
// Do not instantiate - all methods are static.
private TypeHelper() {
}
/**
* Returns <code>true</code> if it is preferable to pass parameters of the given type to methods
* by reference, not by value. A parameter should be passed by reference if it is
* a <code>class</code>, <code>struct</code>, or <code>union</code>, and either has a nontrivial
* copy constructor or nontrivial destructor, or is larger than pointer.
*
* @param type the type in question.
* @param ast the AST used as a context.
* @return <code>true</code> is passing by reverence is preferable.
*/
public static boolean shouldBePassedByReference(IType type, IASTTranslationUnit ast) {
type = SemanticUtil.getNestedType(type, SemanticUtil.CVTYPE | SemanticUtil.TDEF);
if (type instanceof ICompositeType) {
if (type instanceof ICPPClassType) {
ICPPClassType classType = ((ICPPClassType) type);
if (!TypeTraits.hasTrivialCopyCtor(classType, ast) ||
!TypeTraits.hasTrivialDestructor(classType, ast)) {
return true;
}
}
SizeofCalculator calc = ((ASTTranslationUnit) ast).getSizeofCalculator();
SizeAndAlignment sizeofPointer = calc.sizeAndAlignmentOfPointer();
long maxSize = sizeofPointer != null ? sizeofPointer.size : 4;
SizeAndAlignment sizeofType = calc.sizeAndAlignment(type);
if (sizeofType == null || sizeofType.size > maxSize)
return true;
}
return false;
}
public static IType createType(IASTDeclarator declarator) {
if (declarator.getTranslationUnit() instanceof ICPPASTTranslationUnit) {
return CPPVisitor.createType(declarator);
} else {
return CVisitor.createType(declarator);
}
}
}
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