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// Copyright (C) 2014 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 EMUGL_COMMON_SHARED_LIBRARY_H
#define EMUGL_COMMON_SHARED_LIBRARY_H
#ifdef _WIN32
#include <windows.h>
#endif
namespace emugl {
// A class used to open a platform-specific shared library, and probe
// it for symbols. Usage is the following:
//
// // Open the library.
// SharedLibrary* library = SharedLibrary::open("libFoo");
// if (!library) {
// ... could not find / open library!
// }
//
// //Probe for function symbol.
// FunctionPtr my_func = library->findSymbol("my_func");
//
// // Closes library/
// delete library;
//
class SharedLibrary {
public:
// Open a given library. If |libraryName| has no extension, a
// platform-appropriate extension is added and that path is opened.
// If the |libraryName| has an extension, that form is opened.
//
// On OSX, some libraries don't include an extension (notably OpenGL)
// On OSX we try to open |libraryName| first. If that doesn't exist,
// we try |libraryName|.dylib
//
// On success, returns a new SharedLibrary instance that must be
// deleted by the caller.
static SharedLibrary* open(const char* libraryName);
// Closes an existing SharedLibrary instance.
~SharedLibrary();
// Generic function pointer type, for values returned by the
// findSymbol() method.
typedef void (*FunctionPtr)(void);
// Probe a given SharedLibrary instance to find a symbol named
// |symbolName| in it. Return its address as a FunctionPtr, or
// NULL if the symbol is not found.
FunctionPtr findSymbol(const char* symbolName);
private:
#ifdef _WIN32
typedef HMODULE HandleType;
#else
typedef void* HandleType;
#endif
// Constructor intentionally hidden.
SharedLibrary(HandleType);
HandleType mLib;
};
// Macro to compose emugl shared library name under various OS and bitness
// eg.
// on x86_64, EMUGL_LIBNAME("foo") --> "lib64foo"
#if defined(__x86_64__)
# define EMUGL_LIBNAME(name) "lib64" name
#elif defined(__i386__)
# define EMUGL_LIBNAME(name) "lib" name
#else
/* This header is included by target w/o using EMUGL_LIBNAME(). Don't #error, leave it undefined */
#endif
} // namespace emugl
#endif // EMUGL_COMMON_SHARED_LIBRARY_H
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