forked from OSchip/llvm-project
73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
//===- bolt/RuntimeLibs/RuntimeLibrary.cpp - Runtime Library --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the RuntimeLibrary class.
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//
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//===----------------------------------------------------------------------===//
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#include "bolt/RuntimeLibs/RuntimeLibrary.h"
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#include "bolt/Utils/Utils.h"
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#include "llvm/BinaryFormat/Magic.h"
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#include "llvm/ExecutionEngine/RuntimeDyld.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Support/Path.h"
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#define DEBUG_TYPE "bolt-rtlib"
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using namespace llvm;
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using namespace bolt;
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void RuntimeLibrary::anchor() {}
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std::string RuntimeLibrary::getLibPath(StringRef ToolPath,
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StringRef LibFileName) {
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StringRef Dir = llvm::sys::path::parent_path(ToolPath);
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SmallString<128> LibPath = llvm::sys::path::parent_path(Dir);
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llvm::sys::path::append(LibPath, "lib");
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if (!llvm::sys::fs::exists(LibPath)) {
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// In some cases we install bolt binary into one level deeper in bin/,
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// we need to go back one more level to find lib directory.
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LibPath = llvm::sys::path::parent_path(llvm::sys::path::parent_path(Dir));
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llvm::sys::path::append(LibPath, "lib");
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}
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llvm::sys::path::append(LibPath, LibFileName);
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if (!llvm::sys::fs::exists(LibPath)) {
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errs() << "BOLT-ERROR: library not found: " << LibPath << "\n";
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exit(1);
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}
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return std::string(LibPath.str());
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}
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void RuntimeLibrary::loadLibrary(StringRef LibPath, RuntimeDyld &RTDyld) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> MaybeBuf =
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MemoryBuffer::getFile(LibPath, false, false);
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check_error(MaybeBuf.getError(), LibPath);
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std::unique_ptr<MemoryBuffer> B = std::move(MaybeBuf.get());
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file_magic Magic = identify_magic(B->getBuffer());
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if (Magic == file_magic::archive) {
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Error Err = Error::success();
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object::Archive Archive(B.get()->getMemBufferRef(), Err);
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for (const object::Archive::Child &C : Archive.children(Err)) {
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std::unique_ptr<object::Binary> Bin = cantFail(C.getAsBinary());
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if (object::ObjectFile *Obj = dyn_cast<object::ObjectFile>(&*Bin))
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RTDyld.loadObject(*Obj);
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}
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check_error(std::move(Err), B->getBufferIdentifier());
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} else if (Magic == file_magic::elf_relocatable ||
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Magic == file_magic::elf_shared_object) {
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std::unique_ptr<object::ObjectFile> Obj = cantFail(
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object::ObjectFile::createObjectFile(B.get()->getMemBufferRef()),
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"error creating in-memory object");
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RTDyld.loadObject(*Obj);
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} else {
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errs() << "BOLT-ERROR: unrecognized library format: " << LibPath << "\n";
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exit(1);
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}
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}
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