com.google.gwt.dev.jjs.impl.gflow.cfg.CfgReadWriteNode Maven / Gradle / Ivy
/*
* 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;
/**
* A node corresponding to simultaneous read and write operation (e.g. ++).
*/
public class CfgReadWriteNode extends CfgSimpleNode {
private final JExpression target;
private final JExpression value;
public CfgReadWriteNode(CfgNode parent, JNode node, JExpression target,
JExpression value) {
super(parent, node);
this.target = target;
this.value = value;
}
@Override
public void accept(CfgVisitor visitor) {
visitor.visitReadWriteNode(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
* null 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.
* null 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 "READWRITE(" + targets + ", " + value + ")";
}
@Override
protected CfgNode cloneImpl() {
return new CfgReadWriteNode(getParent(), getJNode(), target, value);
}
}