blob: 1a8ed1bf9498b8958b9b442a664ac91282d1f5fc [file] [log] [blame]
// Copyright 2017 The Crashpad Authors. All rights reserved.
//
// 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 CRASHPAD_TEST_SCOPED_MODULE_HANDLE_H_
#define CRASHPAD_TEST_SCOPED_MODULE_HANDLE_H_
#include "build/build_config.h"
#if BUILDFLAG(IS_POSIX)
#include <dlfcn.h>
#elif BUILDFLAG(IS_WIN)
#include <windows.h>
#endif
namespace crashpad {
namespace test {
//! \brief Maintains ownership of a loadable module handle, releasing it as
//! appropriate on destruction.
class ScopedModuleHandle {
private:
class Impl {
public:
Impl() = delete;
Impl(const Impl&) = delete;
Impl& operator=(const Impl&) = delete;
#if BUILDFLAG(IS_POSIX)
using ModuleHandle = void*;
static void* LookUpSymbol(ModuleHandle handle, const char* symbol_name) {
return dlsym(handle, symbol_name);
}
#elif BUILDFLAG(IS_WIN)
using ModuleHandle = HMODULE;
static void* LookUpSymbol(ModuleHandle handle, const char* symbol_name) {
return reinterpret_cast<void*>(GetProcAddress(handle, symbol_name));
}
#endif
static void Close(ModuleHandle handle);
};
public:
using ModuleHandle = Impl::ModuleHandle;
explicit ScopedModuleHandle(ModuleHandle handle);
ScopedModuleHandle(ScopedModuleHandle&& handle);
ScopedModuleHandle(const ScopedModuleHandle&) = delete;
ScopedModuleHandle& operator=(const ScopedModuleHandle&) = delete;
~ScopedModuleHandle();
//! \return The module handle being managed.
ModuleHandle get() const { return handle_; }
//! \return `true` if this object manages a valid loadable module handle.
bool valid() const { return handle_ != nullptr; }
//! \return The value of the symbol named by \a symbol_name, or `nullptr` on
//! failure.
template <typename T>
T LookUpSymbol(const char* symbol_name) const {
return reinterpret_cast<T>(Impl::LookUpSymbol(handle_, symbol_name));
}
private:
ModuleHandle handle_;
};
} // namespace test
} // namespace crashpad
#endif // CRASHPAD_TEST_SCOPED_MODULE_HANDLE_H_