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84 lines
2.4 KiB
84 lines
2.4 KiB
4 months ago
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/*
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* Copyright (C) 2016 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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#ifndef ART_RUNTIME_PLUGIN_H_
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#define ART_RUNTIME_PLUGIN_H_
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#include <string>
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#include <android-base/logging.h>
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namespace art {
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// This function is loaded from the plugin (if present) and called during runtime initialization.
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// By the time this has been called the runtime has been fully initialized but not other native
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// libraries have been loaded yet. Failure to initialize is considered a fatal error.
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// TODO might want to give initialization function some arguments
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using PluginInitializationFunction = bool (*)();
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using PluginDeinitializationFunction = bool (*)();
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// A class encapsulating a plugin. There is no stable plugin ABI or API and likely never will be.
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// TODO Might want to put some locking in this but ATM we only load these at initialization in a
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// single-threaded fashion so not much need
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class Plugin {
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public:
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static Plugin Create(const std::string& lib) {
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return Plugin(lib);
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}
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bool IsLoaded() const {
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return dlopen_handle_ != nullptr;
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}
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const std::string& GetLibrary() const {
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return library_;
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}
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bool Load(/*out*/std::string* error_msg);
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bool Unload();
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~Plugin() {
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if (IsLoaded() && !Unload()) {
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LOG(ERROR) << "Error unloading " << this;
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}
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}
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Plugin(const Plugin& other);
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// Create move constructor for putting this in a list
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Plugin(Plugin&& other) noexcept
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: library_(other.library_),
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dlopen_handle_(other.dlopen_handle_) {
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other.dlopen_handle_ = nullptr;
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}
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private:
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explicit Plugin(const std::string& library) : library_(library), dlopen_handle_(nullptr) { }
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std::string library_;
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void* dlopen_handle_;
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friend std::ostream& operator<<(std::ostream &os, Plugin const& m);
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};
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std::ostream& operator<<(std::ostream &os, Plugin const& m);
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std::ostream& operator<<(std::ostream &os, const Plugin* m);
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} // namespace art
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#endif // ART_RUNTIME_PLUGIN_H_
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