Calin Juravle | 961ae12 | 2014-08-11 16:11:59 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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 | #ifndef NATIVE_BRIDGE_H_ |
| 18 | #define NATIVE_BRIDGE_H_ |
| 19 | |
| 20 | #include "jni.h" |
| 21 | #include <stdint.h> |
| 22 | |
| 23 | namespace android { |
| 24 | |
| 25 | struct NativeBridgeRuntimeCallbacks; |
| 26 | |
| 27 | // Initialize the native bridge, if any. Should be called by Runtime::Init(). |
| 28 | // A null library filename signals that we do not want to load a native bridge. |
| 29 | void SetupNativeBridge(const char* native_bridge_library_filename, |
| 30 | const NativeBridgeRuntimeCallbacks* runtime_callbacks); |
| 31 | |
Andreas Gampe | 049249c | 2014-08-19 22:31:31 -0700 | [diff] [blame^] | 32 | // Check whether a native bridge is available (initialized). Requires a prior call to |
| 33 | // SetupNativeBridge to make sense. |
| 34 | bool NativeBridgeAvailable(); |
| 35 | |
Calin Juravle | 961ae12 | 2014-08-11 16:11:59 +0100 | [diff] [blame] | 36 | // Load a shared library that is supported by the native bridge. |
| 37 | void* NativeBridgeLoadLibrary(const char* libpath, int flag); |
| 38 | |
| 39 | // Get a native bridge trampoline for specified native method. |
| 40 | void* NativeBridgeGetTrampoline(void* handle, const char* name, const char* shorty, uint32_t len); |
| 41 | |
| 42 | // True if native library is valid and is for an ABI that is supported by native bridge. |
| 43 | bool NativeBridgeIsSupported(const char* libpath); |
| 44 | |
Andreas Gampe | 049249c | 2014-08-19 22:31:31 -0700 | [diff] [blame^] | 45 | // Returns whether we have seen a native bridge error. This could happen because the library |
| 46 | // was not found, rejected, could not be initialized and so on. |
| 47 | // |
| 48 | // This functionality is mainly for testing. |
| 49 | bool NativeBridgeError(); |
| 50 | |
| 51 | // Returns whether a given string is acceptable as a native bridge library filename. |
| 52 | // |
| 53 | // This functionality is exposed mainly for testing. |
| 54 | bool NativeBridgeNameAcceptable(const char* native_bridge_library_filename); |
| 55 | |
Calin Juravle | 961ae12 | 2014-08-11 16:11:59 +0100 | [diff] [blame] | 56 | // Native bridge interfaces to runtime. |
| 57 | struct NativeBridgeCallbacks { |
| 58 | // Initialize native bridge. Native bridge's internal implementation must ensure MT safety and |
| 59 | // that the native bridge is initialized only once. Thus it is OK to call this interface for an |
| 60 | // already initialized native bridge. |
| 61 | // |
| 62 | // Parameters: |
| 63 | // runtime_cbs [IN] the pointer to NativeBridgeRuntimeCallbacks. |
| 64 | // Returns: |
| 65 | // true iff initialization was successful. |
| 66 | bool (*initialize)(const NativeBridgeRuntimeCallbacks* runtime_cbs); |
| 67 | |
| 68 | // Load a shared library that is supported by the native bridge. |
| 69 | // |
| 70 | // Parameters: |
| 71 | // libpath [IN] path to the shared library |
| 72 | // flag [IN] the stardard RTLD_XXX defined in bionic dlfcn.h |
| 73 | // Returns: |
| 74 | // The opaque handle of the shared library if sucessful, otherwise NULL |
| 75 | void* (*loadLibrary)(const char* libpath, int flag); |
| 76 | |
| 77 | // Get a native bridge trampoline for specified native method. The trampoline has same |
| 78 | // sigature as the native method. |
| 79 | // |
| 80 | // Parameters: |
| 81 | // handle [IN] the handle returned from loadLibrary |
| 82 | // shorty [IN] short descriptor of native method |
| 83 | // len [IN] length of shorty |
| 84 | // Returns: |
| 85 | // address of trampoline if successful, otherwise NULL |
| 86 | void* (*getTrampoline)(void* handle, const char* name, const char* shorty, uint32_t len); |
| 87 | |
| 88 | // Check whether native library is valid and is for an ABI that is supported by native bridge. |
| 89 | // |
| 90 | // Parameters: |
| 91 | // libpath [IN] path to the shared library |
| 92 | // Returns: |
| 93 | // TRUE if library is supported by native bridge, FALSE otherwise |
| 94 | bool (*isSupported)(const char* libpath); |
| 95 | }; |
| 96 | |
| 97 | // Runtime interfaces to native bridge. |
| 98 | struct NativeBridgeRuntimeCallbacks { |
| 99 | // Get shorty of a Java method. The shorty is supposed to be persistent in memory. |
| 100 | // |
| 101 | // Parameters: |
| 102 | // env [IN] pointer to JNIenv. |
| 103 | // mid [IN] Java methodID. |
| 104 | // Returns: |
| 105 | // short descriptor for method. |
| 106 | const char* (*getMethodShorty)(JNIEnv* env, jmethodID mid); |
| 107 | |
| 108 | // Get number of native methods for specified class. |
| 109 | // |
| 110 | // Parameters: |
| 111 | // env [IN] pointer to JNIenv. |
| 112 | // clazz [IN] Java class object. |
| 113 | // Returns: |
| 114 | // number of native methods. |
| 115 | uint32_t (*getNativeMethodCount)(JNIEnv* env, jclass clazz); |
| 116 | |
| 117 | // Get at most 'method_count' native methods for specified class 'clazz'. Results are outputed |
| 118 | // via 'methods' [OUT]. The signature pointer in JNINativeMethod is reused as the method shorty. |
| 119 | // |
| 120 | // Parameters: |
| 121 | // env [IN] pointer to JNIenv. |
| 122 | // clazz [IN] Java class object. |
| 123 | // methods [OUT] array of method with the name, shorty, and fnPtr. |
| 124 | // method_count [IN] max number of elements in methods. |
| 125 | // Returns: |
| 126 | // number of method it actually wrote to methods. |
| 127 | uint32_t (*getNativeMethods)(JNIEnv* env, jclass clazz, JNINativeMethod* methods, |
| 128 | uint32_t method_count); |
| 129 | }; |
| 130 | |
| 131 | }; // namespace android |
| 132 | |
| 133 | #endif // NATIVE_BRIDGE_H_ |