131 lines
4.5 KiB
C++
131 lines
4.5 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/ObjectFile.h"
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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/Wasm.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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bool SectionRef::containsSymbol(SymbolRef S) const {
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Expected<section_iterator> SymSec = S.getSection();
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if (!SymSec) {
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// TODO: Actually report errors helpfully.
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consumeError(SymSec.takeError());
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return false;
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}
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return *this == **SymSec;
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}
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uint64_t ObjectFile::getSymbolValue(DataRefImpl Ref) const {
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uint32_t Flags = getSymbolFlags(Ref);
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if (Flags & SymbolRef::SF_Undefined)
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return 0;
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if (Flags & SymbolRef::SF_Common)
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return getCommonSymbolSize(Ref);
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return getSymbolValueImpl(Ref);
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}
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std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
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DataRefImpl Symb) const {
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Expected<StringRef> Name = getSymbolName(Symb);
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if (!Name)
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return errorToErrorCode(Name.takeError());
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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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bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const {
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StringRef SectName;
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if (!getSectionName(Sec, SectName))
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return SectName == ".llvmbc";
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return false;
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}
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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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Expected<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::coff_cl_gl_object:
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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 errorCodeToError(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 errorOrToExpected(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 errorOrToExpected(createCOFFObjectFile(Object));
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case sys::fs::file_magic::wasm_object:
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return createWasmObjectFile(Object);
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}
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llvm_unreachable("Unexpected Object File Type");
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}
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Expected<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 errorCodeToError(EC);
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std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
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Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
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createObjectFile(Buffer->getMemBufferRef());
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if (Error Err = ObjOrErr.takeError())
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return std::move(Err);
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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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