| /******************************************************************************* |
| * Copyright (c) 2000, 2011 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 |
| * Fraunhofer FIRST - extended API and implementation |
| * Technical University Berlin - extended API and implementation |
| * Stephan Herrmann - Contribution for |
| * bug 331649 - [compiler][null] consider null annotations for fields |
| * bug 383368 - [compiler][null] syntactic null analysis for field references |
| *******************************************************************************/ |
| 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.*; |
| import org.eclipse.objectteams.otdt.internal.core.compiler.util.RoleTypeCreator; |
| |
| /** |
| * OTDT changes: |
| * |
| * What: if it's not an ImplicitThis, wrap the type if its a role. |
| */ |
| 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; |
| } |
| |
| public boolean checkNPE(BlockScope scope, FlowContext flowContext, FlowInfo flowInfo) { |
| return true; // never problematic |
| } |
| |
| /* |
| * @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, FlowContext flowContext) { |
| 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; |
| } |
| //{ObjectTeams: only implicit this returned directly: |
| if (isImplicitThis()) |
| // orig: |
| return this.resolvedType = scope.enclosingReceiverType(); |
| // : giro |
| this.resolvedType = RoleTypeCreator.maybeWrapUnqualifiedRoleType( |
| scope.enclosingReceiverType(), |
| scope, |
| this); |
| return this.resolvedType; |
| // SH} |
| } |
| |
| 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); |
| } |
| |
| public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { |
| if (!isImplicitThis()) { |
| // explicit this reference, not allowed in static context |
| // https://bugs.eclipse.org/bugs/show_bug.cgi?id=335780 |
| currentScope.resetEnclosingMethodStaticFlag(); |
| } |
| return super.analyseCode(currentScope, flowContext, flowInfo); |
| } |
| } |