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CPPASTFoldExpression.java
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CPPASTFoldExpression.java
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/*******************************************************************************
* Copyright (c) 2022 Igor V. Kovalenko.
*
* 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:
* Igor V. Kovalenko - initial API and implementation
*******************************************************************************/
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.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.ICPPASTFoldExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTPackExpansionExpression;
import org.eclipse.cdt.core.dom.ast.cpp.ICPPParameterPackType;
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.DestructorCallCollector;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalFixed;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalFoldExpression;
import org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalPackExpansion;
/**
* Implementation for fold expressions.
*/
public class CPPASTFoldExpression extends ASTNode implements ICPPASTFoldExpression, IASTAmbiguityParent {
private final int fOperator;
private final boolean fIsComma;
private ICPPASTExpression fLhs;
private ICPPASTExpression fRhs;
private ICPPEvaluation fEvaluation;
private IASTImplicitDestructorName[] fImplicitDestructorNames;
public CPPASTFoldExpression(int operator, boolean isComma, IASTExpression lhs, IASTExpression rhs) {
fOperator = operator;
fIsComma = isComma;
setOperand1(lhs);
setOperand2(rhs);
}
private void setOperand1(IASTExpression expression) {
assertNotFrozen();
if (expression != null) {
if (!(expression instanceof ICPPASTExpression)) {
throw new IllegalArgumentException(expression.getClass().getName());
}
expression.setParent(this);
}
fLhs = (ICPPASTExpression) expression;
}
public void setOperand2(IASTExpression operand) {
assertNotFrozen();
if (operand != null) {
if (!(operand instanceof ICPPASTExpression)) {
throw new IllegalArgumentException(operand.getClass().getName());
}
operand.setParent(this);
}
fRhs = (ICPPASTExpression) operand;
}
@Override
public IASTExpression copy() {
return copy(CopyStyle.withoutLocations);
}
@Override
public IASTExpression copy(CopyStyle style) {
IASTExpression fLhsCopy = fLhs == null ? null : fLhs.copy(style);
IASTExpression fRhsCopy = fRhs == null ? null : fRhs.copy(style);
CPPASTFoldExpression copy = new CPPASTFoldExpression(fOperator, fIsComma, fLhsCopy, fRhsCopy);
return copy(copy, style);
}
@Override
public ICPPEvaluation getEvaluation() {
if (fEvaluation == null) {
fEvaluation = computeEvaluation();
}
return fEvaluation;
}
private final class UnexpandedParameterPackCounter extends ASTVisitor {
int count;
public UnexpandedParameterPackCounter() {
super(false);
shouldVisitExpressions = true;
count = 0;
}
public int getCount() {
return count;
}
@Override
public int visit(IASTExpression expression) {
if (expression instanceof ICPPASTPackExpansionExpression) {
return PROCESS_SKIP;
}
IType type = expression.getExpressionType();
if (type instanceof ICPPParameterPackType) {
++count;
}
return PROCESS_CONTINUE;
}
}
private int countUnexpandedParameterPacks(IASTExpression e) {
if (e == null) {
return 0;
}
UnexpandedParameterPackCounter counter = new UnexpandedParameterPackCounter();
e.accept(counter);
return counter.getCount();
}
private ICPPEvaluation computeEvaluation() {
int lhsParameterPackCount = countUnexpandedParameterPacks(fLhs);
int rhsParameterPackCount = countUnexpandedParameterPacks(fRhs);
// Either left or right hand side expression shall contain an unexpanded parameter pack,
// but not both.
if (!((lhsParameterPackCount != 0) ^ (rhsParameterPackCount != 0))) {
return EvalFixed.INCOMPLETE;
}
ICPPEvaluation packEval;
ICPPEvaluation initEval;
boolean isLeftFold;
ICPPEvaluation evalL = fLhs == null ? null : fLhs.getEvaluation();
ICPPEvaluation evalR = fRhs == null ? null : fRhs.getEvaluation();
if (lhsParameterPackCount == 0) {
isLeftFold = true;
initEval = evalL;
packEval = evalR;
} else {
isLeftFold = false;
initEval = evalR;
packEval = evalL;
}
ICPPEvaluation[] foldPattern = new ICPPEvaluation[] { new EvalPackExpansion(packEval, this) };
return new EvalFoldExpression(fOperator, fIsComma, isLeftFold, foldPattern, initEval, this);
}
@Override
public IType getExpressionType() {
return CPPEvaluation.getType(this);
}
@Override
public boolean isLValue() {
return getValueCategory() == LVALUE;
}
@Override
public ValueCategory getValueCategory() {
return CPPEvaluation.getValueCategory(this);
}
@Override
public IASTImplicitDestructorName[] getImplicitDestructorNames() {
if (fImplicitDestructorNames == null) {
fImplicitDestructorNames = DestructorCallCollector.getTemporariesDestructorCalls(this);
}
return fImplicitDestructorNames;
}
@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;
}
}
if (fLhs != null && !fLhs.accept(action)) {
return false;
}
if (fRhs != null && !fRhs.accept(action)) {
return false;
}
if (action.shouldVisitExpressions && action.leave(this) == ASTVisitor.PROCESS_ABORT) {
return false;
}
return true;
}
@Override
public void replace(IASTNode child, IASTNode other) {
if (child == fLhs) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
fLhs = (ICPPASTExpression) other;
}
if (child == fRhs) {
other.setPropertyInParent(child.getPropertyInParent());
other.setParent(child.getParent());
fRhs = (ICPPASTExpression) other;
}
}
}