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// Copyright (c) 2017-2019 The Khronos Group Inc.
// Copyright (c) 2017-2019 Valve Corporation
// Copyright (c) 2017-2019 LunarG, Inc.
//
// 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.
//
// Author: Mark Young <marky@lunarg.com>
// Author: Dave Houlton <daveh@lunarg.com>
//
#pragma once
#include <cassert>
#include <sstream>
#include <string>
#include "xr_dependencies.h"
#include "platform_utils.hpp"
#if defined(__GNUC__) && __GNUC__ >= 4
#define LOADER_EXPORT __attribute__((visibility("default")))
#elif defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)
#define LOADER_EXPORT __attribute__((visibility("default")))
#else
#define LOADER_EXPORT
#endif
// Environment variables
#if defined(XR_OS_LINUX) || defined(XR_OS_APPLE)
#include <sys/types.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include <unistd.h>
#include <stdlib.h>
#include <dirent.h>
#ifndef PATH_MAX
#define PATH_MAX 1024
#endif
#define PATH_SEPARATOR ':'
#define DIRECTORY_SYMBOL '/'
// Dynamic Loading of libraries:
typedef void *LoaderPlatformLibraryHandle;
static inline LoaderPlatformLibraryHandle LoaderPlatformLibraryOpen(const std::string &path) {
// When loading the library, we use RTLD_LAZY so that not all symbols have to be
// resolved at this time (which improves performance). Note that if not all symbols
// can be resolved, this could cause crashes later.
// For experimenting/debugging: Define the LD_BIND_NOW environment variable to force all
// symbols to be resolved here.
return dlopen(path.c_str(), RTLD_LAZY | RTLD_LOCAL);
}
static inline const char *LoaderPlatformLibraryOpenError(const std::string &path) {
(void)path;
return dlerror();
}
static inline void LoaderPlatformLibraryClose(LoaderPlatformLibraryHandle library) { dlclose(library); }
static inline void *LoaderPlatformLibraryGetProcAddr(LoaderPlatformLibraryHandle library, const std::string &name) {
assert(library);
assert(!name.empty());
return dlsym(library, name.c_str());
}
static inline const char *LoaderPlatformLibraryGetProcAddrError(const std::string &name) {
(void)name;
return dlerror();
}
#elif defined(XR_OS_WINDOWS)
#define PATH_SEPARATOR ';'
#define DIRECTORY_SYMBOL '\\'
// Workaround for MS VS 2010/2013 missing snprintf and vsnprintf
#if defined(_MSC_VER) && _MSC_VER < 1900
#include <stdint.h>
static inline int32_t xr_vsnprintf(char *result_buffer, size_t buffer_size, const char *print_format, va_list varying_list) {
int32_t copy_count = -1;
if (buffer_size != 0) {
copy_count = _vsnprintf_s(result_buffer, buffer_size, _TRUNCATE, print_format, varying_list);
}
if (copy_count == -1) {
copy_count = _vscprintf(print_format, varying_list);
}
return copy_count;
}
static inline int32_t xr_snprintf(char *result_buffer, size_t buffer_size, const char *print_format, ...) {
va_list varying_list;
va_start(varying_list, print_format);
int32_t copy_count = xr_vsnprintf(result_buffer, buffer_size, print_format, varying_list);
va_end(varying_list);
return copy_count;
}
#define snprintf xr_snprintf
#define vsnprintf xr_vsnprintf
#endif
static std::string DescribeError(uint32_t code, bool prefixErrorCode = true) {
std::string str;
if (prefixErrorCode) {
char prefixBuffer[64];
snprintf(prefixBuffer, sizeof(prefixBuffer), "0x%llx (%lld): ", (uint64_t)code, (int64_t)code);
str = prefixBuffer;
}
// Could use FORMAT_MESSAGE_FROM_HMODULE to specify an error source.
WCHAR errorBufferW[1024]{};
const DWORD errorBufferWCapacity = sizeof(errorBufferW) / sizeof(errorBufferW[0]);
const DWORD length = FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr, (DWORD)code,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), errorBufferW, errorBufferWCapacity, nullptr);
if (length) { // If errorBufferW contains what we are looking for...
str += wide_to_utf8(errorBufferW);
} else {
str = "(unknown)";
}
return str;
}
// Dynamic Loading:
typedef HMODULE LoaderPlatformLibraryHandle;
static LoaderPlatformLibraryHandle LoaderPlatformLibraryOpen(const std::string &path) {
const std::wstring pathW = utf8_to_wide(path);
// Try loading the library the original way first.
LoaderPlatformLibraryHandle handle = LoadLibraryW(pathW.c_str());
if (handle == NULL && GetLastError() == ERROR_MOD_NOT_FOUND) {
const DWORD dwAttrib = GetFileAttributesW(pathW.c_str());
const bool fileExists = (dwAttrib != INVALID_FILE_ATTRIBUTES && !(dwAttrib & FILE_ATTRIBUTE_DIRECTORY));
if (fileExists) {
// If that failed, then try loading it with broader search folders.
handle = LoadLibraryExW(pathW.c_str(), NULL, LOAD_LIBRARY_SEARCH_DEFAULT_DIRS | LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR);
}
}
return handle;
}
static std::string LoaderPlatformLibraryOpenError(const std::string &path) {
std::stringstream ss;
const DWORD dwLastError = GetLastError();
const std::string strError = DescribeError(dwLastError);
ss << "Failed to open dynamic library " << path << " with error " << dwLastError << ": " << strError;
return ss.str();
}
static void LoaderPlatformLibraryClose(LoaderPlatformLibraryHandle library) { FreeLibrary(library); }
static void *LoaderPlatformLibraryGetProcAddr(LoaderPlatformLibraryHandle library, const std::string &name) {
assert(library);
assert(name.size() > 0);
return GetProcAddress(library, name.c_str());
}
static std::string LoaderPlatformLibraryGetProcAddrAddrError(const std::string &name) {
std::stringstream ss;
ss << "Failed to find function " << name << " in dynamic library";
return ss.str();
}
#else // Not Linux or Windows
#define PATH_SEPARATOR ':'
#define DIRECTORY_SYMBOL '/'
static inline LoaderPlatformLibraryHandle LoaderPlatformLibraryOpen(const std::string &path) {
// Stub func
#error("Unknown platform, undefined dynamic library routines resulting");
(void)path;
}
static inline const char *LoaderPlatformLibraryOpenError(const std::string &path) {
// Stub func
(void)path;
}
static inline void LoaderPlatformLibraryClose(LoaderPlatformLibraryHandle library) {
// Stub func
(void)library;
}
static inline void *LoaderPlatformLibraryGetProcAddr(LoaderPlatformLibraryHandle library, const std::string &name) {
// Stub func
void(library);
void(name);
}
static inline const char *LoaderPlatformLibraryGetProcAddrError(const std::string &name) {
// Stub func
(void)name;
}
#endif
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