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/*******************************************************************************
* Copyright (c) 2004, 2015 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:
* John Camelon (IBM) - Initial API and implementation
* Mike Kucera (IBM) - implicit names
* Markus Schorn (Wind River Systems)
* Sergey Prigogin (Google)
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.parser.cpp;
import static org.eclipse.cdt.core.dom.ast.IASTExpression.ValueCategory.LVALUE;
import org.eclipse.cdt.core.dom.ast.ASTVisitor;
import org.eclipse.cdt.core.dom.ast.IASTExpression;
import org.eclipse.cdt.core.dom.ast.IASTImplicitDestructorName;
import org.eclipse.cdt.core.dom.ast.IASTImplicitName;
import org.eclipse.cdt.core.dom.ast.IASTNode;
import org.eclipse.cdt.core.dom.ast.IType;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTExpressionList;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction;
import org.eclipse.cdt.core.parser.util.ArrayUtil;
import org.eclipse.cdt.internal.core.dom.parser.ASTNode;
import org.eclipse.cdt.internal.core.dom.parser.IASTAmbiguityParent;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPEvaluation;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.DestructorCallCollector;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalComma;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalFixed;
public class CPPASTExpressionList extends ASTNode implements ICPPASTExpressionList, IASTAmbiguityParent {
private IASTExpression[] expressions = new IASTExpression[2];
/**
* Caution: may contain nulls.
* @see #computeImplicitNames
*/
private IASTImplicitName[] fImplicitNames;
private IASTImplicitDestructorName[] fImplicitDestructorNames;
private ICPPEvaluation fEvaluation;
@Override
public CPPASTExpressionList copy() {
return copy(CopyStyle.withoutLocations);
}
@Override
public CPPASTExpressionList copy(CopyStyle style) {
CPPASTExpressionList copy = new CPPASTExpressionList();
for (IASTExpression expr : getExpressions()) {
copy.addExpression(expr == null ? null : expr.copy(style));
}
return copy(copy, style);
}
@Override
public IASTExpression[] getExpressions() {
if (expressions == null)
return IASTExpression.EMPTY_EXPRESSION_ARRAY;
return ArrayUtil.trim(IASTExpression.class, expressions);
}
@Override
public void addExpression(IASTExpression expression) {
assertNotFrozen();
expressions = ArrayUtil.append(expressions, expression);
if (expression != null) {
expression.setParent(this);
expression.setPropertyInParent(NESTED_EXPRESSION);
}
}
@Override
public boolean accept(ASTVisitor action) {
if (action.shouldVisitExpressions) {
switch (action.visit(this)) {
case ASTVisitor.PROCESS_ABORT:
return false;
case ASTVisitor.PROCESS_SKIP:
return true;
default:
break;
}
}
IASTExpression[] exps = getExpressions();
IASTImplicitName[] implicits = action.shouldVisitImplicitNames ? computeImplicitNames() : null;
for (int i = 0, n = exps.length; i < n; i++) {
if (!exps[i].accept(action)) {
return false;
}
if (i < n - 1 && implicits != null && implicits[i] != null) {
if (!implicits[i].accept(action)) {
return false;
}
}
}
if (action.shouldVisitImplicitDestructorNames && !acceptByNodes(getImplicitDestructorNames(), action))
return false;
if (action.shouldVisitExpressions) {
switch (action.leave(this)) {
case ASTVisitor.PROCESS_ABORT:
return false;
case ASTVisitor.PROCESS_SKIP:
return true;
default:
break;
}
}
return true;
}
/**
* Returns an array of implicit names where each element of the array represents a comma between
* the expression in the same index and the next expression. This array contains null elements
* as placeholders for commas that do not resolve to overloaded operators.
*/
private IASTImplicitName[] computeImplicitNames() {
if (fImplicitNames == null) {
IASTExpression[] exprs = getExpressions(); // has to be at least two
if (exprs.length < 2)
return fImplicitNames = IASTImplicitName.EMPTY_NAME_ARRAY;
fImplicitNames = new IASTImplicitName[exprs.length - 1];
ICPPFunction[] overloads = getOverloads();
for (int i = 0; i < overloads.length; i++) {
ICPPFunction overload = overloads[i];
if (overload != null && !(overload instanceof CPPImplicitFunction)) {
CPPASTImplicitName operatorName = new CPPASTImplicitName(OverloadableOperator.COMMA, this);
operatorName.setBinding(overload);
operatorName.computeOperatorOffsets(exprs[i], true);
fImplicitNames[i] = operatorName;
}
}
}
return fImplicitNames;
}
@Override
public IASTImplicitName[] getImplicitNames() {
return ArrayUtil.removeNulls(IASTImplicitName.class, computeImplicitNames());
}
@Override
public IASTImplicitDestructorName[] getImplicitDestructorNames() {
if (fImplicitDestructorNames == null) {
fImplicitDestructorNames = DestructorCallCollector.getTemporariesDestructorCalls(this);
}
return fImplicitDestructorNames;
}
private ICPPFunction[] getOverloads() {
ICPPEvaluation eval = getEvaluation();
if (eval instanceof EvalComma) {
CPPSemantics.pushLookupPoint(this);
try {
return ((EvalComma) eval).getOverloads();
} finally {
CPPSemantics.popLookupPoint();
}
}
return null;
}
@Override
public void replace(IASTNode child, IASTNode other) {
if (expressions == null)
return;
for (int i = 0; i < expressions.length; ++i) {
if (child == expressions[i]) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
expressions[i] = (IASTExpression) other;
}
}
}
@Override
public ICPPEvaluation getEvaluation() {
if (fEvaluation == null)
fEvaluation = computeEvaluation();
return fEvaluation;
}
private ICPPEvaluation computeEvaluation() {
final IASTExpression[] exprs = getExpressions();
if (exprs.length < 2)
return EvalFixed.INCOMPLETE;
ICPPEvaluation[] evals = new ICPPEvaluation[exprs.length];
for (int i = 0; i < evals.length; i++) {
evals[i] = ((ICPPASTExpression) exprs[i]).getEvaluation();
}
return new EvalComma(evals, this);
}
@Override
public IType getExpressionType() {
return CPPEvaluation.getType(this);
}
@Override
public ValueCategory getValueCategory() {
return CPPEvaluation.getValueCategory(this);
}
@Override
public boolean isLValue() {
return getValueCategory() == LVALUE;
}
}
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