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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "LlamaRuntimeLinker.h"
#include "mozilla/FileUtils.h"
#include "mozilla/Logging.h"
#include "nsLocalFile.h"
#include "nsXPCOMPrivate.h"
#include "prlink.h"
mozilla::LazyLogModule gLlamaLinkerLog("LlamaRuntimeLinker");
#define LOG(level, fmt, ...) \
MOZ_LOG(gLlamaLinkerLog, level, ("[LlamaRuntimeLinker] " fmt, ##__VA_ARGS__))
namespace mozilla::llama {
LlamaLibWrapper LlamaRuntimeLinker::sLlamaLib;
LlamaRuntimeLinker::LinkStatus LlamaRuntimeLinker::sLinkStatus =
LinkStatus_INIT;
static PRLibrary* LoadLlamaLib(nsIFile* aFile) {
PRLibSpec lspec;
PathString path = aFile->NativePath();
#ifdef XP_WIN
lspec.type = PR_LibSpec_PathnameU;
lspec.value.pathname_u = path.get();
#else
# if defined(XP_OPENBSD)
/* on OpenBSD, libraries are preloaded before sandboxing so make sure only
* the filename is passed to PR_LoadLibraryWithFlags(), dlopen() will return
* the preloaded library handle instead of failing to find it due to
* sandboxing */
nsAutoCString leaf;
nsresult rv = aFile->GetNativeLeafName(leaf);
if (NS_SUCCEEDED(rv)) {
path = PathString(leaf);
}
# endif // defined(XP_OPENBSD)
lspec.type = PR_LibSpec_Pathname;
lspec.value.pathname = path.get();
#endif
#ifdef MOZ_WIDGET_ANDROID
PRLibrary* lib = PR_LoadLibraryWithFlags(lspec, PR_LD_NOW | PR_LD_GLOBAL);
#else
PRLibrary* lib = PR_LoadLibraryWithFlags(lspec, PR_LD_NOW | PR_LD_LOCAL);
#endif
if (!lib) {
LOG(LogLevel::Error, "unable to load library %s",
aFile->HumanReadablePath().get());
}
return lib;
}
LlamaLibWrapper::LinkResult LlamaLibWrapper::Link() {
if (!mLlamaLib) {
Unlink();
return LinkResult::NoProvidedLib;
}
LOG(LogLevel::Debug, "Linking llama library symbols");
// Use X-macros to bind all functions
#define BIND_FUNCTION(ret, name, params) \
if (!((name) = (decltype(name))PR_FindSymbol(mLlamaLib, #name))) { \
LOG(LogLevel::Error, "Couldn't load function " #name); \
Unlink(); \
return LinkResult::MissingFunction; \
}
MOZINFERENCE_FUNCTION_LIST(BIND_FUNCTION)
#undef BIND_FUNCTION
LOG(LogLevel::Debug, "Successfully linked all llama functions");
return LinkResult::Success;
}
void LlamaLibWrapper::Unlink() {
if (mLlamaLib) {
PR_UnloadLibrary(mLlamaLib);
mLlamaLib = nullptr;
}
// Clear all function pointers using X-macros
#define CLEAR_FUNCTION(ret, name, params) name = nullptr;
MOZINFERENCE_FUNCTION_LIST(CLEAR_FUNCTION)
#undef CLEAR_FUNCTION
}
/* static */
bool LlamaRuntimeLinker::Init() {
// Quick return if already initialized
if (sLinkStatus == LinkStatus_SUCCEEDED) {
return true;
}
if (sLinkStatus == LinkStatus_FAILED) {
return false;
}
LOG(LogLevel::Debug, "Initializing llama runtime linker");
sLinkStatus = LinkStatus_FAILED;
// Get the path to the current executable/library
#ifdef XP_WIN
PathString path =
GetLibraryFilePathname(LXUL_DLL, (PRFuncPtr)&LlamaRuntimeLinker::Init);
#else
PathString path =
GetLibraryFilePathname(XUL_DLL, (PRFuncPtr)&LlamaRuntimeLinker::Init);
#endif
if (path.IsEmpty()) {
LOG(LogLevel::Error, "Failed to get library path");
return false;
}
nsCOMPtr<nsIFile> libFile;
if (NS_FAILED(NS_NewPathStringLocalFile(path, getter_AddRefs(libFile)))) {
LOG(LogLevel::Error, "Failed to create file object from path");
return false;
}
// Handle test environments
if (getenv("MOZ_RUN_GTEST")
#ifdef FUZZING
|| getenv("FUZZER")
#endif
) {
// In test environments, the library is in the parent directory
nsCOMPtr<nsIFile> parent;
if (NS_FAILED(libFile->GetParent(getter_AddRefs(parent)))) {
LOG(LogLevel::Error, "Failed to get parent directory");
return false;
}
libFile = parent;
}
// Set the library name with proper prefix and suffix
if (NS_FAILED(libFile->SetNativeLeafName(
MOZ_DLL_PREFIX "mozinference" MOZ_DLL_SUFFIX ""_ns))) {
LOG(LogLevel::Error, "Failed to set library name");
return false;
}
LOG(LogLevel::Debug, "Attempting to load library from: %s",
libFile->HumanReadablePath().get());
sLlamaLib.mLlamaLib = LoadLlamaLib(libFile);
if (!sLlamaLib.mLlamaLib) {
LOG(LogLevel::Error, "Failed to load llama library");
return false;
}
LlamaLibWrapper::LinkResult res = sLlamaLib.Link();
if (res != LlamaLibWrapper::LinkResult::Success) {
LOG(LogLevel::Error, "Failed to link llama library: %d", (int)res);
return false;
}
sLinkStatus = LinkStatus_SUCCEEDED;
LOG(LogLevel::Info, "Successfully initialized llama runtime linker");
return true;
}
} // namespace mozilla::llama
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