tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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helpers_android.cc (3957B)

      1 /*
      2 *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
      3 *
      4 *  Use of this source code is governed by a BSD-style license
      5 *  that can be found in the LICENSE file in the root of the source
      6 *  tree. An additional intellectual property rights grant can be found
      7 *  in the file PATENTS.  All contributing project authors may
      8 *  be found in the AUTHORS file in the root of the source tree.
      9 */
     10 
     11 #include "modules/utility/include/helpers_android.h"
     12 
     13 #include <android/log.h>
     14 #include <jni.h>
     15 #include <stddef.h>
     16 
     17 #include <cstdint>
     18 
     19 #include "rtc_base/checks.h"
     20 #include "rtc_base/platform_thread_types.h"
     21 
     22 #define TAG "HelpersAndroid"
     23 #define ALOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__)
     24 
     25 namespace webrtc {
     26 
     27 JNIEnv* GetEnv(JavaVM* jvm) {
     28  void* env = NULL;
     29  jint status = jvm->GetEnv(&env, JNI_VERSION_1_6);
     30  RTC_CHECK(((env != NULL) && (status == JNI_OK)) ||
     31            ((env == NULL) && (status == JNI_EDETACHED)))
     32      << "Unexpected GetEnv return: " << status << ":" << env;
     33  return reinterpret_cast<JNIEnv*>(env);
     34 }
     35 
     36 // Return a `jlong` that will correctly convert back to `ptr`.  This is needed
     37 // because the alternative (of silently passing a 32-bit pointer to a vararg
     38 // function expecting a 64-bit param) picks up garbage in the high 32 bits.
     39 jlong PointerTojlong(void* ptr) {
     40  static_assert(sizeof(intptr_t) <= sizeof(jlong),
     41                "Time to rethink the use of jlongs");
     42  // Going through intptr_t to be obvious about the definedness of the
     43  // conversion from pointer to integral type.  intptr_t to jlong is a standard
     44  // widening by the static_assert above.
     45  jlong ret = reinterpret_cast<intptr_t>(ptr);
     46  RTC_DCHECK(reinterpret_cast<void*>(ret) == ptr);
     47  return ret;
     48 }
     49 
     50 jmethodID GetMethodID(JNIEnv* jni,
     51                      jclass c,
     52                      const char* name,
     53                      const char* signature) {
     54  jmethodID m = jni->GetMethodID(c, name, signature);
     55  CHECK_EXCEPTION(jni) << "Error during GetMethodID: " << name << ", "
     56                       << signature;
     57  RTC_CHECK(m) << name << ", " << signature;
     58  return m;
     59 }
     60 
     61 jmethodID GetStaticMethodID(JNIEnv* jni,
     62                            jclass c,
     63                            const char* name,
     64                            const char* signature) {
     65  jmethodID m = jni->GetStaticMethodID(c, name, signature);
     66  CHECK_EXCEPTION(jni) << "Error during GetStaticMethodID: " << name << ", "
     67                       << signature;
     68  RTC_CHECK(m) << name << ", " << signature;
     69  return m;
     70 }
     71 
     72 jclass FindClass(JNIEnv* jni, const char* name) {
     73  jclass c = jni->FindClass(name);
     74  CHECK_EXCEPTION(jni) << "Error during FindClass: " << name;
     75  RTC_CHECK(c) << name;
     76  return c;
     77 }
     78 
     79 jobject NewGlobalRef(JNIEnv* jni, jobject o) {
     80  jobject ret = jni->NewGlobalRef(o);
     81  CHECK_EXCEPTION(jni) << "Error during NewGlobalRef";
     82  RTC_CHECK(ret);
     83  return ret;
     84 }
     85 
     86 void DeleteGlobalRef(JNIEnv* jni, jobject o) {
     87  jni->DeleteGlobalRef(o);
     88  CHECK_EXCEPTION(jni) << "Error during DeleteGlobalRef";
     89 }
     90 
     91 AttachThreadScoped::AttachThreadScoped(JavaVM* jvm)
     92    : attached_(false), jvm_(jvm), env_(NULL) {
     93  env_ = GetEnv(jvm);
     94  if (!env_) {
     95    // Adding debug log here so we can track down potential leaks and figure
     96    // out why we sometimes see "Native thread exiting without having called
     97    // DetachCurrentThread" in logcat outputs.
     98    ALOGD("Attaching thread to JVM[tid=%d]", CurrentThreadId());
     99    jint res = jvm->AttachCurrentThread(&env_, NULL);
    100    attached_ = (res == JNI_OK);
    101    RTC_CHECK(attached_) << "AttachCurrentThread failed: " << res;
    102  }
    103 }
    104 
    105 AttachThreadScoped::~AttachThreadScoped() {
    106  if (attached_) {
    107    ALOGD("Detaching thread from JVM[tid=%d]", CurrentThreadId());
    108    jint res = jvm_->DetachCurrentThread();
    109    RTC_CHECK(res == JNI_OK) << "DetachCurrentThread failed: " << res;
    110    RTC_CHECK(!GetEnv(jvm_));
    111  }
    112 }
    113 
    114 JNIEnv* AttachThreadScoped::env() {
    115  return env_;
    116 }
    117 
    118 }  // namespace webrtc