| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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.codegen.*; |
| import org.eclipse.jdt.internal.compiler.flow.*; |
| import org.eclipse.jdt.internal.compiler.lookup.*; |
| |
| public abstract class Reference extends Expression { |
| /** |
| * BaseLevelReference constructor comment. |
| */ |
| public Reference() { |
| super(); |
| } |
| public abstract FlowInfo analyseAssignment(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, Assignment assignment, boolean isCompound); |
| |
| public FlowInfo analyseCode(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo) { |
| return flowInfo; |
| } |
| public FieldBinding fieldBinding() { |
| //this method should be sent one FIELD-tagged references |
| // (ref.bits & BindingIds.FIELD != 0)() |
| return null ; |
| } |
| public void fieldStore(CodeStream codeStream, FieldBinding fieldBinding, MethodBinding syntheticWriteAccessor, boolean valueRequired) { |
| int pc = codeStream.position; |
| if (fieldBinding.isStatic()) { |
| if (valueRequired) { |
| if ((fieldBinding.type == LongBinding) || (fieldBinding.type == DoubleBinding)) { |
| codeStream.dup2(); |
| } else { |
| codeStream.dup(); |
| } |
| } |
| if (syntheticWriteAccessor == null) { |
| codeStream.putstatic(fieldBinding); |
| } else { |
| codeStream.invokestatic(syntheticWriteAccessor); |
| } |
| } else { // Stack: [owner][new field value] ---> [new field value][owner][new field value] |
| if (valueRequired) { |
| if ((fieldBinding.type == LongBinding) || (fieldBinding.type == DoubleBinding)) { |
| codeStream.dup2_x1(); |
| } else { |
| codeStream.dup_x1(); |
| } |
| } |
| if (syntheticWriteAccessor == null) { |
| codeStream.putfield(fieldBinding); |
| } else { |
| codeStream.invokestatic(syntheticWriteAccessor); |
| } |
| } |
| codeStream.recordPositionsFrom(pc, this.sourceStart); |
| } |
| public abstract void generateAssignment(BlockScope currentScope, CodeStream codeStream, Assignment assignment, boolean valueRequired); |
| |
| public abstract void generateCompoundAssignment(BlockScope currentScope, CodeStream codeStream, Expression expression, int operator, int assignmentImplicitConversion, boolean valueRequired); |
| |
| public abstract void generatePostIncrement(BlockScope currentScope, CodeStream codeStream, CompoundAssignment postIncrement, boolean valueRequired); |
| |
| public int nullStatus(FlowInfo flowInfo) { |
| |
| if (this.constant != null && this.constant != NotAConstant) |
| return FlowInfo.NON_NULL; // constant expression cannot be null |
| |
| LocalVariableBinding local = localVariableBinding(); |
| if (local != null) { |
| if (flowInfo.isDefinitelyNull(local)) |
| return FlowInfo.NULL; |
| if (flowInfo.isDefinitelyNonNull(local)) |
| return FlowInfo.NON_NULL; |
| } |
| return FlowInfo.UNKNOWN; |
| } |
| |
| } |