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//===- bolt/RuntimeLibs/RuntimeLibrary.cpp - Runtime Library --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the RuntimeLibrary class.
//
//===----------------------------------------------------------------------===//
#include "bolt/RuntimeLibs/RuntimeLibrary.h"
#include "bolt/Core/Linker.h"
#include "bolt/RuntimeLibs/RuntimeLibraryVariables.inc"
#include "bolt/Utils/Utils.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Program.h"
#define DEBUG_TYPE "bolt-rtlib"
using namespace llvm;
using namespace bolt;
void RuntimeLibrary::anchor() {}
std::string RuntimeLibrary::getLibPathByToolPath(StringRef ToolPath,
StringRef LibFileName) {
StringRef Dir = llvm::sys::path::parent_path(ToolPath);
SmallString<128> LibPath = llvm::sys::path::parent_path(Dir);
llvm::sys::path::append(LibPath, "lib" LLVM_LIBDIR_SUFFIX);
if (!llvm::sys::fs::exists(LibPath)) {
// In some cases we install bolt binary into one level deeper in bin/,
// we need to go back one more level to find lib directory.
LibPath = llvm::sys::path::parent_path(llvm::sys::path::parent_path(Dir));
llvm::sys::path::append(LibPath, "lib" LLVM_LIBDIR_SUFFIX);
}
llvm::sys::path::append(LibPath, LibFileName);
if (!llvm::sys::fs::exists(LibPath)) {
// If it is a symlink, check the directory that the symlink points to.
if (llvm::sys::fs::is_symlink_file(ToolPath)) {
SmallString<256> RealPath;
llvm::sys::fs::real_path(ToolPath, RealPath);
if (llvm::ErrorOr<std::string> P =
llvm::sys::findProgramByName(RealPath)) {
outs() << "BOLT-INFO: library not found: " << LibPath << "\n"
<< "BOLT-INFO: " << ToolPath << " is a symlink; will look up "
<< LibFileName
<< " at the target directory that the symlink points to\n";
return getLibPath(*P, LibFileName);
}
}
errs() << "BOLT-ERROR: library not found: " << LibPath << "\n";
exit(1);
}
return std::string(LibPath);
}
std::string RuntimeLibrary::getLibPathByInstalled(StringRef LibFileName) {
SmallString<128> LibPath(CMAKE_INSTALL_FULL_LIBDIR);
llvm::sys::path::append(LibPath, LibFileName);
return std::string(LibPath);
}
std::string RuntimeLibrary::getLibPath(StringRef ToolPath,
StringRef LibFileName) {
if (llvm::sys::fs::exists(LibFileName)) {
return std::string(LibFileName);
}
std::string ByTool = getLibPathByToolPath(ToolPath, LibFileName);
if (llvm::sys::fs::exists(ByTool)) {
return ByTool;
}
std::string ByInstalled = getLibPathByInstalled(LibFileName);
if (llvm::sys::fs::exists(ByInstalled)) {
return ByInstalled;
}
errs() << "BOLT-ERROR: library not found: " << ByTool << ", " << ByInstalled
<< ", or " << LibFileName << "\n";
exit(1);
}
void RuntimeLibrary::loadLibrary(StringRef LibPath, BOLTLinker &Linker,
BOLTLinker::SectionsMapper MapSections) {
ErrorOr<std::unique_ptr<MemoryBuffer>> MaybeBuf =
MemoryBuffer::getFile(LibPath, false, false);
check_error(MaybeBuf.getError(), LibPath);
std::unique_ptr<MemoryBuffer> B = std::move(MaybeBuf.get());
file_magic Magic = identify_magic(B->getBuffer());
if (Magic == file_magic::archive) {
Error Err = Error::success();
object::Archive Archive(B->getMemBufferRef(), Err);
for (const object::Archive::Child &C : Archive.children(Err)) {
std::unique_ptr<object::Binary> Bin = cantFail(C.getAsBinary());
if (object::ObjectFile *Obj = dyn_cast<object::ObjectFile>(&*Bin))
Linker.loadObject(Obj->getMemoryBufferRef(), MapSections);
}
check_error(std::move(Err), B->getBufferIdentifier());
} else if (Magic == file_magic::elf_relocatable ||
Magic == file_magic::elf_shared_object) {
std::unique_ptr<object::ObjectFile> Obj =
cantFail(object::ObjectFile::createObjectFile(B->getMemBufferRef()),
"error creating in-memory object");
Linker.loadObject(Obj->getMemoryBufferRef(), MapSections);
} else {
errs() << "BOLT-ERROR: unrecognized library format: " << LibPath << "\n";
exit(1);
}
}
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