| // Copyright 2017 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 com.google.devtools.build.android.desugar.io.CoreLibraryRewriter; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import org.objectweb.asm.ClassVisitor; |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.Opcodes; |
| |
| /** This class rewrites calls to supported Long.unsigned* methods to use desugar's runtime lib. */ |
| public class LongUnsignedMethodRewriter extends ClassVisitor { |
| |
| private final CoreLibraryRewriter rewriter; |
| private final AtomicInteger numOfUnsignedLongsInvoked; |
| |
| public LongUnsignedMethodRewriter( |
| ClassVisitor cv, CoreLibraryRewriter rewriter, AtomicInteger numOfUnsignedLongsInvoked) { |
| super(Opcodes.ASM7, cv); |
| this.rewriter = rewriter; |
| this.numOfUnsignedLongsInvoked = numOfUnsignedLongsInvoked; |
| } |
| |
| @Override |
| public MethodVisitor visitMethod( |
| int access, String name, String desc, String signature, String[] exceptions) { |
| MethodVisitor visitor = super.cv.visitMethod(access, name, desc, signature, exceptions); |
| return visitor == null ? visitor : new LongUnsignedMethodVisitor(visitor); |
| } |
| |
| private class LongUnsignedMethodVisitor extends MethodVisitor { |
| |
| public LongUnsignedMethodVisitor(MethodVisitor visitor) { |
| super(Opcodes.ASM7, visitor); |
| } |
| |
| @Override |
| public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) { |
| if (opcode == Opcodes.INVOKESTATIC |
| && rewriter.unprefix(owner).equals("java/lang/Long") |
| && desc.equals("(JJ)J")) { |
| if (name.equals("divideUnsigned") || name.equals("remainderUnsigned")) { |
| numOfUnsignedLongsInvoked.incrementAndGet(); |
| owner = "com/google/devtools/build/android/desugar/runtime/UnsignedLongs"; |
| } |
| } |
| super.visitMethodInsn(opcode, owner, name, desc, itf); |
| } |
| } |
| } |