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