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// Copyright (c) 2012 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.
#include "base/android/jni_android.h"
#include <map>
#include "base/android/build_info.h"
#include "base/android/jni_string.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
namespace {
using base::android::GetClass;
using base::android::MethodID;
using base::android::ScopedJavaLocalRef;
JavaVM* g_jvm = NULL;
// Leak the global app context, as it is used from a non-joinable worker thread
// that may still be running at shutdown. There is no harm in doing this.
base::LazyInstance<base::android::ScopedJavaGlobalRef<jobject> >::Leaky
g_application_context = LAZY_INSTANCE_INITIALIZER;
std::string GetJavaExceptionInfo(JNIEnv* env, jthrowable java_throwable) {
ScopedJavaLocalRef<jclass> throwable_clazz =
GetClass(env, "java/lang/Throwable");
jmethodID throwable_printstacktrace =
MethodID::Get<MethodID::TYPE_INSTANCE>(
env, throwable_clazz.obj(), "printStackTrace",
"(Ljava/io/PrintStream;)V");
// Create an instance of ByteArrayOutputStream.
ScopedJavaLocalRef<jclass> bytearray_output_stream_clazz =
GetClass(env, "java/io/ByteArrayOutputStream");
jmethodID bytearray_output_stream_constructor =
MethodID::Get<MethodID::TYPE_INSTANCE>(
env, bytearray_output_stream_clazz.obj(), "<init>", "()V");
jmethodID bytearray_output_stream_tostring =
MethodID::Get<MethodID::TYPE_INSTANCE>(
env, bytearray_output_stream_clazz.obj(), "toString",
"()Ljava/lang/String;");
ScopedJavaLocalRef<jobject> bytearray_output_stream(env,
env->NewObject(bytearray_output_stream_clazz.obj(),
bytearray_output_stream_constructor));
// Create an instance of PrintStream.
ScopedJavaLocalRef<jclass> printstream_clazz =
GetClass(env, "java/io/PrintStream");
jmethodID printstream_constructor =
MethodID::Get<MethodID::TYPE_INSTANCE>(
env, printstream_clazz.obj(), "<init>",
"(Ljava/io/OutputStream;)V");
ScopedJavaLocalRef<jobject> printstream(env,
env->NewObject(printstream_clazz.obj(), printstream_constructor,
bytearray_output_stream.obj()));
// Call Throwable.printStackTrace(PrintStream)
env->CallVoidMethod(java_throwable, throwable_printstacktrace,
printstream.obj());
// Call ByteArrayOutputStream.toString()
ScopedJavaLocalRef<jstring> exception_string(
env, static_cast<jstring>(
env->CallObjectMethod(bytearray_output_stream.obj(),
bytearray_output_stream_tostring)));
return ConvertJavaStringToUTF8(exception_string);
}
} // namespace
namespace base {
namespace android {
JNIEnv* AttachCurrentThread() {
DCHECK(g_jvm);
JNIEnv* env = NULL;
jint ret = g_jvm->AttachCurrentThread(&env, NULL);
DCHECK_EQ(JNI_OK, ret);
return env;
}
JNIEnv* AttachCurrentThreadWithName(const std::string& thread_name) {
DCHECK(g_jvm);
JavaVMAttachArgs args;
args.version = JNI_VERSION_1_2;
args.name = thread_name.c_str();
args.group = NULL;
JNIEnv* env = NULL;
jint ret = g_jvm->AttachCurrentThread(&env, &args);
DCHECK_EQ(JNI_OK, ret);
return env;
}
void DetachFromVM() {
// Ignore the return value, if the thread is not attached, DetachCurrentThread
// will fail. But it is ok as the native thread may never be attached.
if (g_jvm)
g_jvm->DetachCurrentThread();
}
void InitVM(JavaVM* vm) {
DCHECK(!g_jvm);
g_jvm = vm;
}
bool IsVMInitialized() {
return g_jvm != NULL;
}
void InitApplicationContext(JNIEnv* env, const JavaRef<jobject>& context) {
if (env->IsSameObject(g_application_context.Get().obj(), context.obj())) {
// It's safe to set the context more than once if it's the same context.
return;
}
DCHECK(g_application_context.Get().is_null());
g_application_context.Get().Reset(context);
}
const jobject GetApplicationContext() {
DCHECK(!g_application_context.Get().is_null());
return g_application_context.Get().obj();
}
ScopedJavaLocalRef<jclass> GetClass(JNIEnv* env, const char* class_name) {
jclass clazz = env->FindClass(class_name);
CHECK(!ClearException(env) && clazz) << "Failed to find class " << class_name;
return ScopedJavaLocalRef<jclass>(env, clazz);
}
template<MethodID::Type type>
jmethodID MethodID::Get(JNIEnv* env,
jclass clazz,
const char* method_name,
const char* jni_signature) {
jmethodID id = type == TYPE_STATIC ?
env->GetStaticMethodID(clazz, method_name, jni_signature) :
env->GetMethodID(clazz, method_name, jni_signature);
CHECK(base::android::ClearException(env) || id) <<
"Failed to find " <<
(type == TYPE_STATIC ? "static " : "") <<
"method " << method_name << " " << jni_signature;
return id;
}
// If |atomic_method_id| set, it'll return immediately. Otherwise, it'll call
// into ::Get() above. If there's a race, it's ok since the values are the same
// (and the duplicated effort will happen only once).
template<MethodID::Type type>
jmethodID MethodID::LazyGet(JNIEnv* env,
jclass clazz,
const char* method_name,
const char* jni_signature,
base::subtle::AtomicWord* atomic_method_id) {
COMPILE_ASSERT(sizeof(subtle::AtomicWord) >= sizeof(jmethodID),
AtomicWord_SmallerThan_jMethodID);
subtle::AtomicWord value = base::subtle::Acquire_Load(atomic_method_id);
if (value)
return reinterpret_cast<jmethodID>(value);
jmethodID id = MethodID::Get<type>(env, clazz, method_name, jni_signature);
base::subtle::Release_Store(
atomic_method_id, reinterpret_cast<subtle::AtomicWord>(id));
return id;
}
// Various template instantiations.
template jmethodID MethodID::Get<MethodID::TYPE_STATIC>(
JNIEnv* env, jclass clazz, const char* method_name,
const char* jni_signature);
template jmethodID MethodID::Get<MethodID::TYPE_INSTANCE>(
JNIEnv* env, jclass clazz, const char* method_name,
const char* jni_signature);
template jmethodID MethodID::LazyGet<MethodID::TYPE_STATIC>(
JNIEnv* env, jclass clazz, const char* method_name,
const char* jni_signature, base::subtle::AtomicWord* atomic_method_id);
template jmethodID MethodID::LazyGet<MethodID::TYPE_INSTANCE>(
JNIEnv* env, jclass clazz, const char* method_name,
const char* jni_signature, base::subtle::AtomicWord* atomic_method_id);
bool HasException(JNIEnv* env) {
return env->ExceptionCheck() != JNI_FALSE;
}
bool ClearException(JNIEnv* env) {
if (!HasException(env))
return false;
env->ExceptionDescribe();
env->ExceptionClear();
return true;
}
void CheckException(JNIEnv* env) {
if (!HasException(env)) return;
// Exception has been found, might as well tell breakpad about it.
jthrowable java_throwable = env->ExceptionOccurred();
if (!java_throwable) {
// Do nothing but return false.
CHECK(false);
}
// Clear the pending exception, since a local reference is now held.
env->ExceptionDescribe();
env->ExceptionClear();
// Set the exception_string in BuildInfo so that breakpad can read it.
// RVO should avoid any extra copies of the exception string.
base::android::BuildInfo::GetInstance()->set_java_exception_info(
GetJavaExceptionInfo(env, java_throwable));
// Now, feel good about it and die.
CHECK(false);
}
} // namespace android
} // namespace base
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