Brian Carlstrom | b2acfa2 | 2013-06-19 15:09:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "JniInvocation.h" |
| 18 | |
| 19 | #include <dlfcn.h> |
| 20 | #include <stdlib.h> |
| 21 | |
| 22 | #include <cstddef> |
| 23 | |
| 24 | #define LOG_TAG "JniInvocation" |
| 25 | #include "cutils/log.h" |
| 26 | |
| 27 | #ifdef HAVE_ANDROID_OS |
| 28 | #include "cutils/properties.h" |
| 29 | #endif |
| 30 | |
| 31 | JniInvocation* JniInvocation::jni_invocation_ = NULL; |
| 32 | |
| 33 | JniInvocation::JniInvocation() : |
| 34 | handle_(NULL), |
| 35 | JNI_GetDefaultJavaVMInitArgs_(NULL), |
| 36 | JNI_CreateJavaVM_(NULL), |
| 37 | JNI_GetCreatedJavaVMs_(NULL) { |
| 38 | |
| 39 | LOG_ALWAYS_FATAL_IF(jni_invocation_ != NULL, "JniInvocation instance already initialized"); |
| 40 | jni_invocation_ = this; |
| 41 | } |
| 42 | |
| 43 | JniInvocation::~JniInvocation() { |
| 44 | jni_invocation_ = NULL; |
| 45 | if (handle_ != NULL) { |
| 46 | dlclose(handle_); |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | bool JniInvocation::Init(const char* library) { |
| 51 | #ifdef HAVE_ANDROID_OS |
| 52 | char default_library[PROPERTY_VALUE_MAX]; |
Brian Carlstrom | df03494 | 2013-06-30 13:12:55 -0700 | [diff] [blame] | 53 | property_get("persist.sys.dalvik.vm.lib", default_library, "libdvm.so"); |
Brian Carlstrom | b2acfa2 | 2013-06-19 15:09:28 -0700 | [diff] [blame] | 54 | #else |
| 55 | const char* default_library = "libdvm.so"; |
| 56 | #endif |
| 57 | if (library == NULL) { |
| 58 | library = default_library; |
| 59 | } |
| 60 | |
| 61 | handle_ = dlopen(library, RTLD_NOW); |
| 62 | if (handle_ == NULL) { |
| 63 | ALOGE("Failed to dlopen %s: %s", library, dlerror()); |
| 64 | return false; |
| 65 | } |
| 66 | if (!FindSymbol(reinterpret_cast<void**>(&JNI_GetDefaultJavaVMInitArgs_), |
| 67 | "JNI_GetDefaultJavaVMInitArgs")) { |
| 68 | return false; |
| 69 | } |
| 70 | if (!FindSymbol(reinterpret_cast<void**>(&JNI_CreateJavaVM_), |
| 71 | "JNI_CreateJavaVM")) { |
| 72 | return false; |
| 73 | } |
| 74 | if (!FindSymbol(reinterpret_cast<void**>(&JNI_GetCreatedJavaVMs_), |
| 75 | "JNI_GetCreatedJavaVMs")) { |
| 76 | return false; |
| 77 | } |
| 78 | return true; |
| 79 | } |
| 80 | |
| 81 | jint JniInvocation::JNI_GetDefaultJavaVMInitArgs(void* vmargs) { |
| 82 | return JNI_GetDefaultJavaVMInitArgs_(vmargs); |
| 83 | } |
| 84 | |
| 85 | jint JniInvocation::JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args) { |
| 86 | return JNI_CreateJavaVM_(p_vm, p_env, vm_args); |
| 87 | } |
| 88 | |
| 89 | jint JniInvocation::JNI_GetCreatedJavaVMs(JavaVM** vms, jsize size, jsize* vm_count) { |
| 90 | return JNI_GetCreatedJavaVMs_(vms, size, vm_count); |
| 91 | } |
| 92 | |
| 93 | bool JniInvocation::FindSymbol(void** pointer, const char* symbol) { |
| 94 | *pointer = dlsym(handle_, symbol); |
| 95 | if (*pointer == NULL) { |
| 96 | ALOGE("Failed to find symbol %s: %s\n", symbol, dlerror()); |
| 97 | dlclose(handle_); |
| 98 | handle_ = NULL; |
| 99 | return false; |
| 100 | } |
| 101 | return true; |
| 102 | } |
| 103 | |
| 104 | JniInvocation& JniInvocation::GetJniInvocation() { |
| 105 | LOG_ALWAYS_FATAL_IF(jni_invocation_ == NULL, |
| 106 | "Failed to create JniInvocation instance before using JNI invocation API"); |
| 107 | return *jni_invocation_; |
| 108 | } |
| 109 | |
| 110 | extern "C" jint JNI_GetDefaultJavaVMInitArgs(void* vm_args) { |
| 111 | return JniInvocation::GetJniInvocation().JNI_GetDefaultJavaVMInitArgs(vm_args); |
| 112 | } |
| 113 | |
| 114 | extern "C" jint JNI_CreateJavaVM(JavaVM** p_vm, JNIEnv** p_env, void* vm_args) { |
| 115 | return JniInvocation::GetJniInvocation().JNI_CreateJavaVM(p_vm, p_env, vm_args); |
| 116 | } |
| 117 | |
| 118 | extern "C" jint JNI_GetCreatedJavaVMs(JavaVM** vms, jsize size, jsize* vm_count) { |
| 119 | return JniInvocation::GetJniInvocation().JNI_GetCreatedJavaVMs(vms, size, vm_count); |
| 120 | } |