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// Copyright 2016 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.truth.Truth.assertThat;
import static org.junit.Assert.fail;
import com.google.devtools.build.android.desugar.io.BitFlags;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
@RunWith(JUnit4.class)
public class Java7CompatibilityTest {
@Test
public void testJava7CompatibleInterface() throws Exception {
ClassReader reader = new ClassReader(ExtendsDefault.class.getName());
ClassTester tester = new ClassTester();
reader.accept(new Java7Compatibility(tester, null, null), 0);
assertThat(tester.version).isEqualTo(Opcodes.V1_7);
assertThat(tester.bridgeMethods).isEqualTo(0); // make sure we strip bridge methods
assertThat(tester.clinitMethods).isEqualTo(1); // make sure we don't strip <clinit>
}
@Test
public void testDefaultMethodFails() throws Exception {
ClassReader reader = new ClassReader(WithDefault.class.getName());
try {
reader.accept(new Java7Compatibility(null, null, null), 0);
fail("IllegalArgumentException expected");
} catch (IllegalArgumentException expected) {
assertThat(expected).hasMessageThat().contains("getVersion()I");
}
}
/**
* Tests that a class implementing interfaces with bridge methods redeclares those bridges.
* This is behavior of javac that we rely on.
*/
@Test
public void testConcreteClassRedeclaresBridges() throws Exception {
ClassReader reader = new ClassReader(Impl.class.getName());
ClassTester tester = new ClassTester();
reader.accept(new Java7Compatibility(tester, null, null), 0);
assertThat(tester.version).isEqualTo(Opcodes.V1_7);
assertThat(tester.bridgeMethods).isEqualTo(2);
}
private static class ClassTester extends ClassVisitor {
int version;
int bridgeMethods;
int clinitMethods;
private ClassTester() {
super(Opcodes.ASM5, null);
}
@Override
public void visit(
int version,
int access,
String name,
String signature,
String superName,
String[] interfaces) {
this.version = version;
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public MethodVisitor visitMethod(
int access, String name, String desc, String signature, String[] exceptions) {
if (BitFlags.isSet(access, Opcodes.ACC_BRIDGE)) {
++bridgeMethods;
}
if ("<clinit>".equals(name)) {
++clinitMethods;
}
return super.visitMethod(access, name, desc, signature, exceptions);
}
}
interface WithDefault<T> {
default int getVersion() {
return 18;
}
T get();
}
// Javac will generate a default bridge method "Object get()" that Java7Compatibility will remove
interface ExtendsDefault<T extends Number> extends WithDefault<T> {
public static final Integer X = Integer.valueOf(37);
String name();
@Override T get();
}
// Javac will generate 2 bridge methods that we *don't* want to remove
static class Impl implements ExtendsDefault<Integer> {
@Override public Integer get() {
return X;
}
@Override public String name() {
return "test";
}
}
}
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