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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 com.google.common.collect.ImmutableList;
import java.lang.reflect.Method;
import java.util.LinkedHashSet;
import java.util.Objects;
import java.util.Set;
import javax.annotation.Nullable;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
/**
* Helper that keeps track of which core library classes and methods we want to rewrite.
*/
class CoreLibrarySupport {
private final CoreLibraryRewriter rewriter;
private final ClassLoader targetLoader;
/** Internal name prefixes that we want to move to a custom package. */
private final ImmutableList<String> renamedPrefixes;
/** Internal names of interfaces whose default and static interface methods we'll emulate. */
private final ImmutableList<Class<?>> emulatedInterfaces;
public CoreLibrarySupport(CoreLibraryRewriter rewriter, ClassLoader targetLoader,
ImmutableList<String> renamedPrefixes, ImmutableList<String> emulatedInterfaces)
throws ClassNotFoundException {
this.rewriter = rewriter;
this.targetLoader = targetLoader;
checkArgument(
renamedPrefixes.stream().allMatch(prefix -> prefix.startsWith("java/")), renamedPrefixes);
this.renamedPrefixes = renamedPrefixes;
ImmutableList.Builder<Class<?>> classBuilder = ImmutableList.builder();
for (String itf : emulatedInterfaces) {
checkArgument(itf.startsWith("java/util/"), itf);
Class<?> clazz = targetLoader.loadClass((rewriter.getPrefix() + itf).replace('/', '.'));
checkArgument(clazz.isInterface(), itf);
classBuilder.add(clazz);
}
this.emulatedInterfaces = classBuilder.build();
}
public boolean isRenamedCoreLibrary(String internalName) {
String unprefixedName = rewriter.unprefix(internalName);
if (!unprefixedName.startsWith("java/")) {
return false; // shortcut
}
// Rename any classes desugar might generate under java/ (for emulated interfaces) as well as
// configured prefixes
return unprefixedName.contains("$$Lambda$")
|| unprefixedName.endsWith("$$CC")
|| renamedPrefixes.stream().anyMatch(prefix -> unprefixedName.startsWith(prefix));
}
public String renameCoreLibrary(String internalName) {
internalName = rewriter.unprefix(internalName);
return (internalName.startsWith("java/"))
? "j$/" + internalName.substring(/* cut away "java/" prefix */ 5)
: internalName;
}
public boolean isEmulatedCoreLibraryInvocation(
int opcode, String owner, String name, String desc, boolean itf) {
return getEmulatedCoreLibraryInvocationTarget(opcode, owner, name, desc, itf) != null;
}
@Nullable
public Class<?> getEmulatedCoreLibraryInvocationTarget(
int opcode, String owner, String name, String desc, boolean itf) {
if (owner.contains("$$Lambda$") || owner.endsWith("$$CC")) {
return null; // regular desugaring handles invocations on generated classes, no emulation
}
Class<?> clazz = getEmulatedCoreClassOrInterface(owner);
if (clazz == null) {
return null;
}
if (itf && opcode == Opcodes.INVOKESTATIC) {
return clazz; // static interface method
}
Method callee = findInterfaceMethod(clazz, name, desc);
if (callee != null && callee.isDefault()) {
return callee.getDeclaringClass();
}
return null;
}
private Class<?> getEmulatedCoreClassOrInterface(String internalName) {
{
String unprefixedOwner = rewriter.unprefix(internalName);
if (!unprefixedOwner.startsWith("java/util/") || isRenamedCoreLibrary(unprefixedOwner)) {
return null;
}
}
Class<?> clazz;
try {
clazz = targetLoader.loadClass(internalName.replace('/', '.'));
} catch (ClassNotFoundException e) {
throw (NoClassDefFoundError) new NoClassDefFoundError().initCause(e);
}
if (emulatedInterfaces.stream().anyMatch(itf -> itf.isAssignableFrom(clazz))) {
return clazz;
}
return null;
}
private static Method findInterfaceMethod(Class<?> clazz, String name, String desc) {
return collectImplementedInterfaces(clazz, new LinkedHashSet<>())
.stream()
// search more subtypes before supertypes
.sorted(DefaultMethodClassFixer.InterfaceComparator.INSTANCE)
.map(itf -> findMethod(itf, name, desc))
.filter(Objects::nonNull)
.findFirst()
.orElse((Method) null);
}
private static Method findMethod(Class<?> clazz, String name, String desc) {
for (Method m : clazz.getMethods()) {
if (m.getName().equals(name) && Type.getMethodDescriptor(m).equals(desc)) {
return m;
}
}
return null;
}
private static Set<Class<?>> collectImplementedInterfaces(Class<?> clazz, Set<Class<?>> dest) {
if (clazz.isInterface()) {
if (!dest.add(clazz)) {
return dest;
}
} else if (clazz.getSuperclass() != null) {
collectImplementedInterfaces(clazz.getSuperclass(), dest);
}
for (Class<?> itf : clazz.getInterfaces()) {
collectImplementedInterfaces(itf, dest);
}
return dest;
}
}
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