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 <assert.h>
15 #include <pthread.h>
16 #include <stddef.h>
17 #include <unistd.h>
18
19 #include "rtc_base/checks.h"
20 #include "rtc_base/platform_thread.h"
21
22 #define TAG "HelpersAndroid"
23 #define ALOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__)
24
25 namespace webrtc {
26
GetEnv(JavaVM * jvm)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.
PointerTojlong(void * ptr)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
GetMethodID(JNIEnv * jni,jclass c,const char * name,const char * signature)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
GetStaticMethodID(JNIEnv * jni,jclass c,const char * name,const char * signature)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
FindClass(JNIEnv * jni,const char * name)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
NewGlobalRef(JNIEnv * jni,jobject o)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
DeleteGlobalRef(JNIEnv * jni,jobject o)86 void DeleteGlobalRef(JNIEnv* jni, jobject o) {
87 jni->DeleteGlobalRef(o);
88 CHECK_EXCEPTION(jni) << "Error during DeleteGlobalRef";
89 }
90
AttachThreadScoped(JavaVM * jvm)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]", rtc::CurrentThreadId());
99 jint res = jvm->AttachCurrentThread(&env_, NULL);
100 attached_ = (res == JNI_OK);
101 RTC_CHECK(attached_) << "AttachCurrentThread failed: " << res;
102 }
103 }
104
~AttachThreadScoped()105 AttachThreadScoped::~AttachThreadScoped() {
106 if (attached_) {
107 ALOGD("Detaching thread from JVM[tid=%d]", rtc::CurrentThreadId());
108 jint res = jvm_->DetachCurrentThread();
109 RTC_CHECK(res == JNI_OK) << "DetachCurrentThread failed: " << res;
110 RTC_CHECK(!GetEnv(jvm_));
111 }
112 }
113
env()114 JNIEnv* AttachThreadScoped::env() {
115 return env_;
116 }
117
118 } // namespace webrtc
119