com.google.gwt.dev.jjs.impl.ReplaceGetClassOverrides Maven / Gradle / Ivy
/*
* Copyright 2011 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;
import com.google.gwt.dev.jjs.ast.Context;
import com.google.gwt.dev.jjs.ast.JField;
import com.google.gwt.dev.jjs.ast.JFieldRef;
import com.google.gwt.dev.jjs.ast.JMethod;
import com.google.gwt.dev.jjs.ast.JMethodCall;
import com.google.gwt.dev.jjs.ast.JModVisitor;
import com.google.gwt.dev.jjs.ast.JProgram;
/**
* Prune all overrides of Object.getClass() except when the enclosing class is JavaScriptObject
* (to permit getClass() devirtualization in Devirtualizer to continue to work).
* Also Inline all method calls to Object.getClass() as Object.clazz.
*/
public class ReplaceGetClassOverrides {
public static void exec(JProgram program) {
new GetClassInlinerRemover(program).accept(program);
}
private static class GetClassInlinerRemover extends JModVisitor {
private JProgram program;
private JMethod getClassMethod;
private JField clazzField;
public GetClassInlinerRemover(JProgram program) {
this.program = program;
getClassMethod = program.getIndexedMethod("Object.getClass");
clazzField = program.getIndexedField("Object.___clazz");
}
@Override
public void endVisit(JMethod x, Context ctx) {
// Don't prune getClass() for objects where it is devirtualized (String, JSOs for now)
if (Devirtualizer.isGetClassDevirtualized(program, x.getEnclosingType())) {
return;
}
if (x.getOverriddenMethods().contains(getClassMethod)) {
ctx.removeMe();
}
}
@Override
public void endVisit(JMethodCall x, Context ctx) {
// Don't inline getClass() for objects where it is devirtualized (String, JSOs for now)
if (Devirtualizer.isGetClassDevirtualized(program, x.getTarget().getEnclosingType())) {
return;
}
// replace overridden getClass() with reference to Object.clazz field
if (x.getTarget() == getClassMethod ||
x.getTarget().getOverriddenMethods().contains(getClassMethod)) {
ctx.replaceMe(new JFieldRef(x.getSourceInfo(), x.getInstance(),
clazzField, clazzField.getEnclosingType()));
}
}
}
}