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