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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.bytecode;
import static org.objectweb.asm.Opcodes.ASM5;
import static org.objectweb.asm.Opcodes.INVOKESTATIC;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
/**
* A ClassVisitor which adds calls to
* {@link org.chromium.base.ThreadUtils}'s assertOnUiThread/assertOnBackgroundThread when the
* corresponding {@link android.support.annotation.UiThread} or
* {@link android.support.annotation.WorkerThread} annotations are present. The function calls
* are placed at the start of the method.
*/
class ThreadAssertionClassAdapter extends ClassVisitor {
private static final String THREAD_UTILS_DESCRIPTOR = "org/chromium/base/ThreadUtils";
private static final String THREAD_UTILS_SIGNATURE = "()V";
private static final String UI_THREAD_ANNOTATION_DESCRIPTOR =
"Landroid/support/annotation/UiThread;";
private static final String WORKER_THREAD_ANNOTATION_DESCRIPTOR =
"Landroid/support/annotation/WorkerThread;";
ThreadAssertionClassAdapter(ClassVisitor visitor) {
super(ASM5, visitor);
}
@Override
public MethodVisitor visitMethod(final int access, final String name, String desc,
String signature, String[] exceptions) {
return new AddAssertMethodVisitor(
super.visitMethod(access, name, desc, signature, exceptions));
}
private static class AddAssertMethodVisitor extends MethodVisitor {
String mAssertMethodName = "";
AddAssertMethodVisitor(MethodVisitor mv) {
super(ASM5, mv);
}
/**
* Call for annotations on the method. Checks if the annotation is @UiThread
* or @WorkerThread, and if so will set the mAssertMethodName property to the name of the
* method to call in order to assert that a method is running on the intented thread.
*
* @param descriptor Annotation descriptor containing its name and package.
*/
@Override
public AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {
switch (descriptor) {
case UI_THREAD_ANNOTATION_DESCRIPTOR:
mAssertMethodName = "assertOnUiThread";
break;
case WORKER_THREAD_ANNOTATION_DESCRIPTOR:
mAssertMethodName = "assertOnBackgroundThread";
break;
default:
break;
}
return super.visitAnnotation(descriptor, visible);
}
/**
* Called to start visiting code. Will also insert the assertOnXThread methods at the start
* of the method if needed.
*/
@Override
public void visitCode() {
super.visitCode();
if (!mAssertMethodName.equals("")) {
visitMethodInsn(INVOKESTATIC, THREAD_UTILS_DESCRIPTOR, mAssertMethodName,
THREAD_UTILS_SIGNATURE, false);
}
}
}
}
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