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eae4673c2f
make_error_code(object_error) is slow because object::object_category() uses a ManagedStatic variable. But the real problem is that the function is called too frequently. This patch uses std::error_code() instead of object_error::success. In most cases, we return "success", so this patch reduces number of function calls to that function. http://reviews.llvm.org/D10333 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239409 91177308-0d34-0410-b5e6-96231b3b80d8
101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
//===- ObjectFile.cpp - File format independent object file -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a file format independent ObjectFile class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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#include <system_error>
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using namespace llvm;
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using namespace object;
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void ObjectFile::anchor() { }
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ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
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: SymbolicFile(Type, Source) {}
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std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
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DataRefImpl Symb) const {
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StringRef Name;
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if (std::error_code EC = getSymbolName(Symb, Name))
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return EC;
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OS << Name;
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return std::error_code();
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}
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uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; }
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section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
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return section_iterator(SectionRef(Sec, this));
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}
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ErrorOr<std::unique_ptr<ObjectFile>>
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ObjectFile::createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type) {
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StringRef Data = Object.getBuffer();
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if (Type == sys::fs::file_magic::unknown)
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Type = sys::fs::identify_magic(Data);
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switch (Type) {
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case sys::fs::file_magic::unknown:
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case sys::fs::file_magic::bitcode:
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case sys::fs::file_magic::archive:
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case sys::fs::file_magic::macho_universal_binary:
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case sys::fs::file_magic::windows_resource:
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return object_error::invalid_file_type;
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case sys::fs::file_magic::elf:
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case sys::fs::file_magic::elf_relocatable:
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case sys::fs::file_magic::elf_executable:
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case sys::fs::file_magic::elf_shared_object:
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case sys::fs::file_magic::elf_core:
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return createELFObjectFile(Object);
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case sys::fs::file_magic::macho_object:
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case sys::fs::file_magic::macho_executable:
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case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
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case sys::fs::file_magic::macho_core:
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case sys::fs::file_magic::macho_preload_executable:
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case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
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case sys::fs::file_magic::macho_dynamic_linker:
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case sys::fs::file_magic::macho_bundle:
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case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
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case sys::fs::file_magic::macho_dsym_companion:
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case sys::fs::file_magic::macho_kext_bundle:
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return createMachOObjectFile(Object);
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case sys::fs::file_magic::coff_object:
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case sys::fs::file_magic::coff_import_library:
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case sys::fs::file_magic::pecoff_executable:
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return createCOFFObjectFile(Object);
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}
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llvm_unreachable("Unexpected Object File Type");
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}
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ErrorOr<OwningBinary<ObjectFile>>
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ObjectFile::createObjectFile(StringRef ObjectPath) {
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ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
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MemoryBuffer::getFile(ObjectPath);
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if (std::error_code EC = FileOrErr.getError())
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return EC;
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std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
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ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr =
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createObjectFile(Buffer->getMemBufferRef());
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if (std::error_code EC = ObjOrErr.getError())
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return EC;
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std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
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return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));
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}
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