org.eclipse.jdt.internal.compiler.ast.ThisReference Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;
import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.flow.FlowContext;
import org.eclipse.jdt.internal.compiler.flow.FlowInfo;
import org.eclipse.jdt.internal.compiler.impl.Constant;
import org.eclipse.jdt.internal.compiler.lookup.*;
public class ThisReference extends Reference {
public static ThisReference implicitThis(){
ThisReference implicitThis = new ThisReference(0, 0);
implicitThis.bits |= IsImplicitThis;
return implicitThis;
}
public ThisReference(int sourceStart, int sourceEnd) {
this.sourceStart = sourceStart;
this.sourceEnd = sourceEnd;
}
/*
* @see Reference#analyseAssignment(...)
*/
public FlowInfo analyseAssignment(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, Assignment assignment, boolean isCompound) {
return flowInfo; // this cannot be assigned
}
public boolean checkAccess(MethodScope methodScope) {
// this/super cannot be used in constructor call
if (methodScope.isConstructorCall) {
methodScope.problemReporter().fieldsOrThisBeforeConstructorInvocation(this);
return false;
}
// static may not refer to this/super
if (methodScope.isStatic) {
methodScope.problemReporter().errorThisSuperInStatic(this);
return false;
}
return true;
}
/*
* @see Reference#generateAssignment(...)
*/
public void generateAssignment(BlockScope currentScope, CodeStream codeStream, Assignment assignment, boolean valueRequired) {
// this cannot be assigned
}
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
int pc = codeStream.position;
if (valueRequired)
codeStream.aload_0();
if ((this.bits & IsImplicitThis) == 0) codeStream.recordPositionsFrom(pc, this.sourceStart);
}
/*
* @see Reference#generateCompoundAssignment(...)
*/
public void generateCompoundAssignment(BlockScope currentScope, CodeStream codeStream, Expression expression, int operator, int assignmentImplicitConversion, boolean valueRequired) {
// this cannot be assigned
}
/*
* @see org.eclipse.jdt.internal.compiler.ast.Reference#generatePostIncrement()
*/
public void generatePostIncrement(BlockScope currentScope, CodeStream codeStream, CompoundAssignment postIncrement, boolean valueRequired) {
// this cannot be assigned
}
public boolean isImplicitThis() {
return (this.bits & IsImplicitThis) != 0;
}
public boolean isThis() {
return true ;
}
public int nullStatus(FlowInfo flowInfo) {
return FlowInfo.NON_NULL;
}
public StringBuffer printExpression(int indent, StringBuffer output){
if (isImplicitThis()) return output;
return output.append("this"); //$NON-NLS-1$
}
public TypeBinding resolveType(BlockScope scope) {
this.constant = Constant.NotAConstant;
if (!isImplicitThis() &&!checkAccess(scope.methodScope())) {
return null;
}
return this.resolvedType = scope.enclosingReceiverType();
}
public void traverse(ASTVisitor visitor, BlockScope blockScope) {
visitor.visit(this, blockScope);
visitor.endVisit(this, blockScope);
}
public void traverse(ASTVisitor visitor, ClassScope blockScope) {
visitor.visit(this, blockScope);
visitor.endVisit(this, blockScope);
}
}