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// 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.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Rewriter of default and static interface methods defined in some core libraries.
*
* <p>This is conceptually similar to call site rewriting in {@link InterfaceDesugaring} but here
* we're doing it for certain bootclasspath methods and in particular for invokeinterface and
* invokevirtual, which are ignored in regular {@link InterfaceDesugaring}.
*/
public class CoreLibraryInvocationRewriter extends ClassVisitor {
private final CoreLibrarySupport support;
public CoreLibraryInvocationRewriter(ClassVisitor cv, CoreLibrarySupport support) {
super(Opcodes.ASM6, cv);
this.support = support;
}
@Override
public MethodVisitor visitMethod(
int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor result = super.visitMethod(access, name, desc, signature, exceptions);
return result != null ? new CoreLibraryMethodInvocationRewriter(result) : null;
}
private class CoreLibraryMethodInvocationRewriter extends MethodVisitor {
public CoreLibraryMethodInvocationRewriter(MethodVisitor mv) {
super(Opcodes.ASM6, mv);
}
@Override
public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) {
Class<?> coreInterface =
support.getCoreInterfaceRewritingTarget(opcode, owner, name, desc, itf);
if (coreInterface != null) {
String coreInterfaceName = coreInterface.getName().replace('.', '/');
name =
InterfaceDesugaring.normalizeInterfaceMethodName(
name, name.startsWith("lambda$"), opcode == Opcodes.INVOKESTATIC);
if (opcode == Opcodes.INVOKESTATIC) {
checkState(owner.equals(coreInterfaceName));
} else {
desc = InterfaceDesugaring.companionDefaultMethodDescriptor(coreInterfaceName, desc);
}
if (opcode == Opcodes.INVOKESTATIC || opcode == Opcodes.INVOKESPECIAL) {
checkArgument(itf || opcode == Opcodes.INVOKESPECIAL,
"Expected interface to rewrite %s.%s : %s", owner, name, desc);
owner = coreInterface.isInterface()
? InterfaceDesugaring.getCompanionClassName(coreInterfaceName)
: checkNotNull(support.getMoveTarget(coreInterfaceName, name));
} else {
checkState(coreInterface.isInterface());
owner = coreInterfaceName + "$$Dispatch";
}
opcode = Opcodes.INVOKESTATIC;
itf = false;
} else {
String newOwner = support.getMoveTarget(owner, name);
if (newOwner != null) {
if (opcode != Opcodes.INVOKESTATIC) {
// assuming a static method
desc = InterfaceDesugaring.companionDefaultMethodDescriptor(owner, desc);
opcode = Opcodes.INVOKESTATIC;
}
owner = newOwner;
itf = false; // assuming a class
}
}
super.visitMethodInsn(opcode, owner, name, desc, itf);
}
}
}
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