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