| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #pragma once |
| |
| #include <jni.h> |
| #include <log/log.h> |
| |
| // JNI helpers. |
| static inline jclass FindClassOrDie(JNIEnv* env, const char* class_name) { |
| jclass clazz = env->FindClass(class_name); |
| LOG_ALWAYS_FATAL_IF(clazz == NULL, "Unable to find class %s", class_name); |
| return clazz; |
| } |
| |
| static inline jmethodID GetMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name, |
| const char* method_signature) { |
| jmethodID res = env->GetMethodID(clazz, method_name, method_signature); |
| LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find method %s", method_name); |
| return res; |
| } |
| |
| static inline jmethodID GetStaticMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name, |
| const char* method_signature) { |
| jmethodID res = env->GetStaticMethodID(clazz, method_name, method_signature); |
| LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static method %s", method_name); |
| return res; |
| } |
| |
| static inline jfieldID GetFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name, |
| const char* field_signature) { |
| jfieldID res = env->GetFieldID(clazz, field_name, field_signature); |
| LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name); |
| return res; |
| } |
| |
| static inline jfieldID GetStaticFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name, |
| const char* field_signature) { |
| jfieldID res = env->GetStaticFieldID(clazz, field_name, field_signature); |
| LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name); |
| return res; |
| } |
| |
| static inline jint GetStaticIntFieldValueOrDie(JNIEnv* env, jclass clazz, const char* fieldName) { |
| jfieldID res = env->GetStaticFieldID(clazz, fieldName, "I"); |
| LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", fieldName); |
| return env->GetStaticIntField(clazz, res); |
| } |
| |
| static inline jstring GetStringField(JNIEnv* env, jobject obj, jfieldID field) { |
| return reinterpret_cast<jstring>(env->GetObjectField(obj, field)); |
| } |
| |
| static inline jbyteArray GetByteArrayField(JNIEnv* env, jobject obj, jfieldID field) { |
| return reinterpret_cast<jbyteArray>(env->GetObjectField(obj, field)); |
| } |
| |
| static inline JNIEnv* GetJNIEnvironment(JavaVM* vm) { |
| JNIEnv* env; |
| if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) { |
| return 0; |
| } |
| return env; |
| } |
| |
| static inline JNIEnv* GetOrAttachJNIEnvironment(JavaVM* jvm) { |
| JNIEnv* env = GetJNIEnvironment(jvm); |
| if (!env) { |
| int result = jvm->AttachCurrentThread(&env, nullptr); |
| CHECK_EQ(result, JNI_OK) << "thread attach failed"; |
| struct VmDetacher { |
| VmDetacher(JavaVM* vm) : mVm(vm) {} |
| ~VmDetacher() { mVm->DetachCurrentThread(); } |
| |
| private: |
| JavaVM* const mVm; |
| }; |
| static thread_local VmDetacher detacher(jvm); |
| } |
| return env; |
| } |