| // Copyright 2020 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.r8.desugar; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| import static org.objectweb.asm.Opcodes.ACC_ABSTRACT; |
| import static org.objectweb.asm.Opcodes.ACC_INTERFACE; |
| |
| import org.objectweb.asm.Opcodes; |
| import org.objectweb.asm.ClassVisitor; |
| import org.objectweb.asm.Handle; |
| import org.objectweb.asm.MethodVisitor; |
| |
| /** |
| * ASM visitor to collect summary information from class files for checking that desugaring has been |
| * applied |
| */ |
| public class DesugarInfoCollector extends ClassVisitor { |
| private int largestClassFileVersion; |
| private int numberOfInvokeDynamic; |
| private int numberOfDefaultMethods; |
| private int numberOfDesugaredLambdas; |
| private int numberOfCompanionClasses; |
| |
| private int currentClassAccess; |
| |
| public DesugarInfoCollector() { |
| this(null); |
| } |
| |
| public DesugarInfoCollector(ClassVisitor classVisitor) { |
| super(Opcodes.ASM9, classVisitor); |
| } |
| |
| public int getNumberOfInvokeDynamic() { |
| return numberOfInvokeDynamic; |
| } |
| |
| public int getNumberOfDefaultMethods() { |
| return numberOfDefaultMethods; |
| } |
| |
| public int getLargestMajorClassFileVersion() { |
| return computeMajorClassFileVersion(largestClassFileVersion); |
| } |
| |
| public int getNumberOfDesugaredLambdas() { |
| return numberOfDesugaredLambdas; |
| } |
| |
| public int getNumberOfCompanionClasses() { |
| return numberOfCompanionClasses; |
| } |
| |
| @Override |
| public void visit( |
| int version, |
| int access, |
| java.lang.String name, |
| java.lang.String signature, |
| java.lang.String superName, |
| java.lang.String[] interfaces) { |
| super.visit(version, access, name, signature, superName, interfaces); |
| assertThat(computeMinorClassFileVersion(version)).isEqualTo(0); |
| largestClassFileVersion = Math.max(version, largestClassFileVersion); |
| if (classNameFromBinaryName(name).contains("$$ExternalSyntheticLambda")) { |
| numberOfDesugaredLambdas++; |
| } |
| if (name.endsWith("$-CC")) { |
| numberOfCompanionClasses++; |
| } |
| currentClassAccess = access; |
| } |
| |
| @Override |
| public MethodVisitor visitMethod( |
| int access, String name, String descriptor, String signature, String[] exceptions) { |
| MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions); |
| if (isInterface(currentClassAccess) && !isAbstract(access)) { |
| numberOfDefaultMethods++; |
| } |
| return new LambdaUseMethodVisitor(api, mv); |
| } |
| |
| private class LambdaUseMethodVisitor extends MethodVisitor { |
| |
| LambdaUseMethodVisitor(int api, MethodVisitor methodVisitor) { |
| super(api, methodVisitor); |
| } |
| |
| @Override |
| public void visitInvokeDynamicInsn(String name, String desc, Handle bsm, Object... bsmArgs) { |
| super.visitInvokeDynamicInsn(name, desc, bsm, bsmArgs); |
| numberOfInvokeDynamic++; |
| } |
| } |
| |
| private static int computeMinorClassFileVersion(int version) { |
| return (version >> 16) & 0xffff; |
| } |
| |
| private static int computeMajorClassFileVersion(int version) { |
| return version & 0xffff; |
| } |
| |
| private static boolean isAbstract(int access) { |
| return (access & ACC_ABSTRACT) != 0; |
| } |
| |
| private static boolean isInterface(int access) { |
| return (access & ACC_INTERFACE) != 0; |
| } |
| |
| private static String classNameFromBinaryName(String name) { |
| int index = name.lastIndexOf('/'); |
| if (index == -1) { |
| return name; |
| } |
| return name.substring(index + 1); |
| } |
| } |