| /* |
| * Copyright 2009 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dev.jjs.impl.gflow.cfg; |
| |
| import com.google.gwt.dev.jjs.ast.JExpression; |
| import com.google.gwt.dev.jjs.ast.JNode; |
| import com.google.gwt.dev.jjs.ast.JVariable; |
| import com.google.gwt.dev.jjs.ast.JVariableRef; |
| |
| /** |
| * Node corresponding to write operation. |
| */ |
| public class CfgWriteNode extends CfgSimpleNode<JNode> { |
| private final JExpression target; |
| private final JExpression value; |
| |
| public CfgWriteNode(CfgNode<?> parent, JNode node, JExpression target, |
| JExpression value) { |
| super(parent, node); |
| this.target = target; |
| this.value = value; |
| } |
| |
| @Override |
| public void accept(CfgVisitor visitor) { |
| visitor.visitWriteNode(this); |
| } |
| |
| /** |
| * Get operation target. I.e. expression, describing what's changed. |
| */ |
| public JExpression getTarget() { |
| return target; |
| } |
| |
| /** |
| * Get target variable if target is variable reference. Returns |
| * <code>null</code> otherwise (e.g. target is array reference). |
| */ |
| public JVariable getTargetVariable() { |
| return target instanceof JVariableRef ? ((JVariableRef) target).getTarget() |
| : null; |
| } |
| |
| /** |
| * Get expression which is assigned to value. |
| * <code>null</code> when new value expression can't be statically determined. |
| */ |
| public JExpression getValue() { |
| return value; |
| } |
| |
| @Override |
| public String toDebugString() { |
| String targets = target.toString(); |
| if (getTargetVariable() != null) { |
| targets = getTargetVariable().getName(); |
| } |
| return "WRITE(" + targets + ", " + value + ")"; |
| } |
| |
| @Override |
| protected CfgNode<?> cloneImpl() { |
| return new CfgWriteNode(getParent(), getJNode(), target, value); |
| } |
| } |