com.google.gwt.dev.jjs.impl.ReplaceDefenderMethodReferences Maven / Gradle / Ivy
/*
* Copyright 2014 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.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;
import com.google.gwt.dev.jjs.ast.JThisRef;
/**
* Java8 defender methods are implemented by creating a forwarding method on each class that
* inherits the implementation. For a concrete type C inheriting I.m(), there will be an
* implementation C.m() { return I.super.m(); }.
*
* References to I.super.m() are replaced by creating a static version of this method on the
* interface, and then delegating to it instead.
*/
public class ReplaceDefenderMethodReferences extends JModVisitor {
private final MakeCallsStatic.CreateStaticImplsVisitor staticImplCreator;
private JProgram program;
public static void exec(JProgram program) {
ReplaceDefenderMethodReferences visitor =
new ReplaceDefenderMethodReferences(program);
visitor.accept(program);
}
private ReplaceDefenderMethodReferences(JProgram program) {
this.program = program;
this.staticImplCreator = new MakeCallsStatic.CreateStaticImplsVisitor(program);
}
@Override
public void endVisit(JMethodCall x, Context ctx) {
JMethod targetMethod = x.getTarget();
if (targetMethod.isDefaultMethod() && x.isStaticDispatchOnly()) {
assert x.getInstance() instanceof JThisRef;
JMethod staticMethod = staticImplCreator.getOrCreateStaticImpl(program, targetMethod);
// Cannot use setStaticDispatchOnly() here because interfaces don't have prototypes
JMethodCall callStaticMethod = new JMethodCall(x.getSourceInfo(), null, staticMethod);
// add 'this' as first parameter
callStaticMethod.addArg(new JThisRef(x.getSourceInfo(), targetMethod.getEnclosingType()));
callStaticMethod.addArgs(x.getArgs());
ctx.replaceMe(callStaticMethod);
}
}
}