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 "webrtc/base/checks.h"
12 #include "webrtc/modules/utility/include/helpers_android.h"
13
14 #include <android/log.h>
15 #include <assert.h>
16 #include <pthread.h>
17 #include <stddef.h>
18 #include <unistd.h>
19
20 #define TAG "HelpersAndroid"
21 #define ALOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__)
22
23 namespace webrtc {
24
GetEnv(JavaVM * jvm)25 JNIEnv* GetEnv(JavaVM* jvm) {
26 void* env = NULL;
27 jint status = jvm->GetEnv(&env, JNI_VERSION_1_6);
28 RTC_CHECK(((env != NULL) && (status == JNI_OK)) ||
29 ((env == NULL) && (status == JNI_EDETACHED)))
30 << "Unexpected GetEnv return: " << status << ":" << env;
31 return reinterpret_cast<JNIEnv*>(env);
32 }
33
34 // Return a |jlong| that will correctly convert back to |ptr|. This is needed
35 // because the alternative (of silently passing a 32-bit pointer to a vararg
36 // function expecting a 64-bit param) picks up garbage in the high 32 bits.
PointerTojlong(void * ptr)37 jlong PointerTojlong(void* ptr) {
38 static_assert(sizeof(intptr_t) <= sizeof(jlong),
39 "Time to rethink the use of jlongs");
40 // Going through intptr_t to be obvious about the definedness of the
41 // conversion from pointer to integral type. intptr_t to jlong is a standard
42 // widening by the static_assert above.
43 jlong ret = reinterpret_cast<intptr_t>(ptr);
44 RTC_DCHECK(reinterpret_cast<void*>(ret) == ptr);
45 return ret;
46 }
47
GetMethodID(JNIEnv * jni,jclass c,const char * name,const char * signature)48 jmethodID GetMethodID (
49 JNIEnv* jni, jclass c, const char* name, const char* signature) {
50 jmethodID m = jni->GetMethodID(c, name, signature);
51 CHECK_EXCEPTION(jni) << "Error during GetMethodID: " << name << ", "
52 << signature;
53 RTC_CHECK(m) << name << ", " << signature;
54 return m;
55 }
56
GetStaticMethodID(JNIEnv * jni,jclass c,const char * name,const char * signature)57 jmethodID GetStaticMethodID (
58 JNIEnv* jni, jclass c, const char* name, const char* signature) {
59 jmethodID m = jni->GetStaticMethodID(c, name, signature);
60 CHECK_EXCEPTION(jni) << "Error during GetStaticMethodID: " << name << ", "
61 << signature;
62 RTC_CHECK(m) << name << ", " << signature;
63 return m;
64 }
65
FindClass(JNIEnv * jni,const char * name)66 jclass FindClass(JNIEnv* jni, const char* name) {
67 jclass c = jni->FindClass(name);
68 CHECK_EXCEPTION(jni) << "Error during FindClass: " << name;
69 RTC_CHECK(c) << name;
70 return c;
71 }
72
NewGlobalRef(JNIEnv * jni,jobject o)73 jobject NewGlobalRef(JNIEnv* jni, jobject o) {
74 jobject ret = jni->NewGlobalRef(o);
75 CHECK_EXCEPTION(jni) << "Error during NewGlobalRef";
76 RTC_CHECK(ret);
77 return ret;
78 }
79
DeleteGlobalRef(JNIEnv * jni,jobject o)80 void DeleteGlobalRef(JNIEnv* jni, jobject o) {
81 jni->DeleteGlobalRef(o);
82 CHECK_EXCEPTION(jni) << "Error during DeleteGlobalRef";
83 }
84
GetThreadId()85 std::string GetThreadId() {
86 char buf[21]; // Big enough to hold a kuint64max plus terminating NULL.
87 int thread_id = gettid();
88 RTC_CHECK_LT(snprintf(buf, sizeof(buf), "%i", thread_id),
89 static_cast<int>(sizeof(buf)))
90 << "Thread id is bigger than uint64??";
91 return std::string(buf);
92 }
93
GetThreadInfo()94 std::string GetThreadInfo() {
95 return "@[tid=" + GetThreadId() + "]";
96 }
97
AttachThreadScoped(JavaVM * jvm)98 AttachThreadScoped::AttachThreadScoped(JavaVM* jvm)
99 : attached_(false), jvm_(jvm), env_(NULL) {
100 env_ = GetEnv(jvm);
101 if (!env_) {
102 // Adding debug log here so we can track down potential leaks and figure
103 // out why we sometimes see "Native thread exiting without having called
104 // DetachCurrentThread" in logcat outputs.
105 ALOGD("Attaching thread to JVM%s", GetThreadInfo().c_str());
106 jint res = jvm->AttachCurrentThread(&env_, NULL);
107 attached_ = (res == JNI_OK);
108 RTC_CHECK(attached_) << "AttachCurrentThread failed: " << res;
109 }
110 }
111
~AttachThreadScoped()112 AttachThreadScoped::~AttachThreadScoped() {
113 if (attached_) {
114 ALOGD("Detaching thread from JVM%s", GetThreadInfo().c_str());
115 jint res = jvm_->DetachCurrentThread();
116 RTC_CHECK(res == JNI_OK) << "DetachCurrentThread failed: " << res;
117 RTC_CHECK(!GetEnv(jvm_));
118 }
119 }
120
env()121 JNIEnv* AttachThreadScoped::env() { return env_; }
122
123 } // namespace webrtc
124