| /* |
| * 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 <code>C.m() { return I.super.m(); }</code>. |
| * |
| * 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); |
| } |
| } |
| } |