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/*
* Copyright (C) 2018 The Android Open Source Project
*
* 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 android.signature.cts.api;
import android.os.Debug;
import android.signature.cts.ClassProvider;
import android.signature.cts.DexField;
import android.signature.cts.DexMethod;
import android.signature.cts.DexMember;
import dalvik.system.BaseDexClassLoader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.stream.Stream;
@SuppressWarnings("deprecation")
public class BootClassPathClassesProvider extends ClassProvider {
private static boolean sJvmtiAttached = false;
@Override
public Stream<Class<?>> getAllClasses() {
maybeAttachJvmtiAgent();
return Arrays.stream(getClassloaderDescriptors(Object.class.getClassLoader()))
.map(descriptor -> {
String classname = descriptor.replace('/', '.');
// omit L and ; at the front and at the end
return classname.substring(1, classname.length() - 1);
})
.map(classname -> {
try {
return getClass(classname);
} catch (ClassNotFoundException e) {
throw new RuntimeException("Cannot load " + classname, e);
}
});
}
@Override
public Stream<DexMember> getAllMembers(Class<?> klass) {
maybeAttachJvmtiAgent();
String[][] field_infos = getClassMemberNamesAndTypes(klass, /* fields */ true);
String[][] method_infos = getClassMemberNamesAndTypes(klass, /* fields */ false);
if (field_infos.length != 2 || field_infos[0].length != field_infos[1].length ||
method_infos.length != 2 || method_infos[0].length != method_infos[1].length) {
throw new RuntimeException("Invalid result from getClassMemberNamesAndTypes");
}
String klass_desc = "L" + klass.getName().replace('.', '/') + ";";
DexMember[] members = new DexMember[field_infos[0].length + method_infos[0].length];
for (int i = 0; i < field_infos[0].length; i++) {
members[i] = new DexField(klass_desc, field_infos[0][i], field_infos[1][i], null);
}
for (int i = 0; i < method_infos[0].length; i++) {
members[i + field_infos[0].length] =
new DexMethod(klass_desc, method_infos[0][i], method_infos[1][i], null);
}
return Arrays.stream(members);
}
private static void maybeAttachJvmtiAgent() {
if (!sJvmtiAttached) {
try {
Debug.attachJvmtiAgent(copyAgentToFile("classdescriptors").getAbsolutePath(), null,
BootClassPathClassesProvider.class.getClassLoader());
sJvmtiAttached = true;
initialize();
} catch (Exception e) {
throw new RuntimeException("Error while attaching JVMTI agent", e);
}
}
}
private static File copyAgentToFile(String lib) throws Exception {
ClassLoader cl = BootClassPathClassesProvider.class.getClassLoader();
File copiedAgent = File.createTempFile("agent", ".so");
try (InputStream is = new FileInputStream(
((BaseDexClassLoader) cl).findLibrary(lib))) {
try (OutputStream os = new FileOutputStream(copiedAgent)) {
byte[] buffer = new byte[64 * 1024];
while (true) {
int numRead = is.read(buffer);
if (numRead == -1) {
break;
}
os.write(buffer, 0, numRead);
}
}
}
return copiedAgent;
}
private static native void initialize();
private static native String[] getClassloaderDescriptors(ClassLoader loader);
private static native String[][] getClassMemberNamesAndTypes(Class<?> klass, boolean getFields);
}
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