| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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.lookup.*; |
| |
| public class ThisReference extends Reference { |
| |
| public static ThisReference implicitThis(){ |
| |
| ThisReference implicitThis = new ThisReference(0, 0); |
| implicitThis.bits |= IsImplicitThisMask; |
| 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 & IsImplicitThisMask) == 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 & IsImplicitThisMask) != 0; |
| } |
| |
| public boolean isThis() { |
| |
| return true ; |
| } |
| |
| public int nullStatus(FlowInfo flowInfo) { |
| return FlowInfo.NON_NULL; |
| } |
| |
| public StringBuffer printExpression(int indent, StringBuffer output){ |
| |
| if (this.isImplicitThis()) return output; |
| return output.append("this"); //$NON-NLS-1$ |
| } |
| |
| public TypeBinding resolveType(BlockScope scope) { |
| |
| constant = NotAConstant; |
| if (!this.isImplicitThis() &&!checkAccess(scope.methodScope())) { |
| return null; |
| } |
| return this.resolvedType = scope.enclosingSourceType(); |
| } |
| |
| public void traverse(ASTVisitor visitor, BlockScope blockScope) { |
| |
| visitor.visit(this, blockScope); |
| visitor.endVisit(this, blockScope); |
| } |
| } |