| // Copyright 2018 The Bazel Authors. All rights reserved. |
| // |
| // 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.devtools.build.android.desugar; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| |
| import org.objectweb.asm.ClassVisitor; |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.commons.ClassRemapper; |
| import org.objectweb.asm.commons.MethodRemapper; |
| import org.objectweb.asm.commons.Remapper; |
| |
| /** |
| * A visitor that renames packages so configured using {@link CoreLibrarySupport}. |
| */ |
| class CorePackageRenamer extends ClassRemapper { |
| |
| private String internalName; |
| |
| public CorePackageRenamer(ClassVisitor cv, CoreLibrarySupport support) { |
| super(cv, new CorePackageRemapper(support)); |
| } |
| |
| @Override |
| public void visit(int version, int access, String name, String signature, String superName, |
| String[] interfaces) { |
| internalName = name; |
| super.visit(version, access, name, signature, superName, interfaces); |
| } |
| |
| @Override |
| protected CoreMethodRemapper createMethodRemapper(MethodVisitor methodVisitor) { |
| return new CoreMethodRemapper(methodVisitor, remapper); |
| } |
| |
| private class CoreMethodRemapper extends MethodRemapper { |
| |
| public CoreMethodRemapper(MethodVisitor methodVisitor, |
| Remapper remapper) { |
| super(methodVisitor, remapper); |
| } |
| |
| @Override |
| public void visitMethodInsn(int opcode, String owner, String name, String descriptor, |
| boolean isInterface) { |
| CorePackageRemapper remapper = (CorePackageRemapper) this.remapper; |
| remapper.didSomething = false; |
| super.visitMethodInsn(opcode, owner, name, descriptor, isInterface); |
| // TODO(b/79121791): Make this more precise: look for all unsupported core library members |
| checkState(!remapper.didSomething |
| || !owner.startsWith("android/") || owner.startsWith("android/support/"), |
| "%s calls %s.%s%s which is not supported with core library desugaring. Please file " |
| + "a feature request to support this method", internalName, owner, name, descriptor); |
| } |
| |
| @Override |
| public void visitFieldInsn(int opcode, String owner, String name, String descriptor) { |
| CorePackageRemapper remapper = (CorePackageRemapper) this.remapper; |
| remapper.didSomething = false; |
| super.visitFieldInsn(opcode, owner, name, descriptor); |
| // TODO(b/79121791): Make this more precise: look for all unsupported core library members |
| checkState(!remapper.didSomething |
| || !owner.startsWith("android/") || owner.startsWith("android/support/"), |
| "%s accesses %s.%s: %s which is not supported with core library desugaring. Please file " |
| + "a feature request to support this field", internalName, owner, name, descriptor); |
| } |
| } |
| |
| /** ASM {@link Remapper} based on {@link CoreLibrarySupport}. */ |
| private static class CorePackageRemapper extends Remapper { |
| |
| private final CoreLibrarySupport support; |
| boolean didSomething = false; |
| |
| CorePackageRemapper(CoreLibrarySupport support) { |
| this.support = support; |
| } |
| |
| @Override |
| public String map(String typeName) { |
| if (support.isRenamedCoreLibrary(typeName)) { |
| didSomething = true; |
| return support.renameCoreLibrary(typeName); |
| } |
| return typeName; |
| } |
| } |
| } |