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 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. 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 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 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 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 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 80 void DeleteGlobalRef(JNIEnv* jni, jobject o) { 81 jni->DeleteGlobalRef(o); 82 CHECK_EXCEPTION(jni) << "Error during DeleteGlobalRef"; 83 } 84 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 94 std::string GetThreadInfo() { 95 return "@[tid=" + GetThreadId() + "]"; 96 } 97 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 } 111 112 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 } 120 121 JNIEnv* AttachThreadScoped::env() { return env_; } 122 123 } // namespace webrtc 124