base/android/jni_android.cc

// 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 <stddef.h>
#include <sys/prctl.h>

#include <map>

#include "base/android/java_exception_reporter.h"
#include "base/android/jni_string.h"
#include "base/android/jni_utils.h"
#include "base/containers/flat_map.h"
#include "base/debug/debugging_buildflags.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/no_destructor.h"
#include "base/synchronization/lock.h"
#include "base/threading/thread_local.h"

namespace base {
namespace android {
namespace {

JavaVM* g_jvm = NULL;
base::LazyInstance<ScopedJavaGlobalRef<jobject>>::Leaky g_class_loader =
    LAZY_INSTANCE_INITIALIZER;
jmethodID g_class_loader_load_class_method_id = 0;

#if BUILDFLAG(CAN_UNWIND_WITH_FRAME_POINTERS)
base::LazyInstance<base::ThreadLocalPointer<void>>::Leaky
    g_stack_frame_pointer = LAZY_INSTANCE_INITIALIZER;
#endif

bool g_fatal_exception_occurred = false;

// Returns a ClassLoader instance which will be able to load classes from the
// specified split.
jobject GetCachedClassLoader(JNIEnv* env, const std::string& split_name) {
  DCHECK(!split_name.empty());
  static base::NoDestructor<base::Lock> lock;
  static base::NoDestructor<
      base::flat_map<std::string, ScopedJavaGlobalRef<jobject>>>
      split_class_loader_map;

  base::AutoLock guard(*lock);
  auto it = split_class_loader_map->find(split_name);
  if (it != split_class_loader_map->end()) {
    return it->second.obj();
  }

  ScopedJavaGlobalRef<jobject> class_loader(
      GetSplitClassLoader(env, split_name));
  jobject class_loader_obj = class_loader.obj();
  split_class_loader_map->insert({split_name, std::move(class_loader)});
  return class_loader_obj;