1 files changed, 182 insertions, 0 deletions
diff --git a/llvm/lib/Object/ObjectFile.cpp b/llvm/lib/Object/ObjectFile.cpp
new file mode 100644
index 000000000000..e0e63a5a7d76
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+++ b/llvm/lib/Object/ObjectFile.cpp
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+//===- ObjectFile.cpp - File format independent object file ---------------===//
+//
+// 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 defines a file format independent ObjectFile class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/BinaryFormat/Magic.h"
+#include "llvm/Object/Binary.h"
+#include "llvm/Object/COFF.h"
+#include "llvm/Object/Error.h"
+#include "llvm/Object/MachO.h"
+#include "llvm/Object/Wasm.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+#include <cstdint>
+#include <memory>
+#include <system_error>
+
+using namespace llvm;
+using namespace object;
+
+void ObjectFile::anchor() {}
+
+ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
+    : SymbolicFile(Type, Source) {}
+
+bool SectionRef::containsSymbol(SymbolRef S) const {
+  Expected<section_iterator> SymSec = S.getSection();
+  if (!SymSec) {
+    // TODO: Actually report errors helpfully.
+    consumeError(SymSec.takeError());
+    return false;
+  }
+  return *this == **SymSec;
+}
+
+uint64_t ObjectFile::getSymbolValue(DataRefImpl Ref) const {
+  uint32_t Flags = getSymbolFlags(Ref);
+  if (Flags & SymbolRef::SF_Undefined)
+    return 0;
+  if (Flags & SymbolRef::SF_Common)
+    return getCommonSymbolSize(Ref);
+  return getSymbolValueImpl(Ref);
+}
+
+Error ObjectFile::printSymbolName(raw_ostream &OS, DataRefImpl Symb) const {
+  Expected<StringRef> Name = getSymbolName(Symb);
+  if (!Name)
+    return Name.takeError();
+  OS << *Name;
+  return Error::success();
+}
+
+uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; }
+
+bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const {
+  Expected<StringRef> NameOrErr = getSectionName(Sec);
+  if (NameOrErr)
+    return *NameOrErr == ".llvmbc";
+  consumeError(NameOrErr.takeError());
+  return false;
+}
+
+bool ObjectFile::isSectionStripped(DataRefImpl Sec) const { return false; }
+
+bool ObjectFile::isBerkeleyText(DataRefImpl Sec) const {
+  return isSectionText(Sec);
+}
+
+bool ObjectFile::isBerkeleyData(DataRefImpl Sec) const {
+  return isSectionData(Sec);
+}
+
+Expected<section_iterator>
+ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
+  return section_iterator(SectionRef(Sec, this));
+}
+
+Triple ObjectFile::makeTriple() const {
+  Triple TheTriple;
+  auto Arch = getArch();
+  TheTriple.setArch(Triple::ArchType(Arch));
+
+  // For ARM targets, try to use the build attributes to build determine
+  // the build target. Target features are also added, but later during
+  // disassembly.
+  if (Arch == Triple::arm || Arch == Triple::armeb)
+    setARMSubArch(TheTriple);
+
+  // TheTriple defaults to ELF, and COFF doesn't have an environment:
+  // the best we can do here is indicate that it is mach-o.
+  if (isMachO())
+    TheTriple.setObjectFormat(Triple::MachO);
+
+  if (isCOFF()) {
+    const auto COFFObj = cast<COFFObjectFile>(this);
+    if (COFFObj->getArch() == Triple::thumb)
+      TheTriple.setTriple("thumbv7-windows");
+  }
+
+  return TheTriple;
+}
+
+Expected<std::unique_ptr<ObjectFile>>
+ObjectFile::createObjectFile(MemoryBufferRef Object, file_magic Type) {
+  StringRef Data = Object.getBuffer();
+  if (Type == file_magic::unknown)
+    Type = identify_magic(Data);
+
+  switch (Type) {
+  case file_magic::unknown:
+  case file_magic::bitcode:
+  case file_magic::coff_cl_gl_object:
+  case file_magic::archive:
+  case file_magic::macho_universal_binary:
+  case file_magic::windows_resource:
+  case file_magic::pdb:
+  case file_magic::minidump:
+    return errorCodeToError(object_error::invalid_file_type);
+  case file_magic::tapi_file:
+    return errorCodeToError(object_error::invalid_file_type);
+  case file_magic::elf:
+  case file_magic::elf_relocatable:
+  case file_magic::elf_executable:
+  case file_magic::elf_shared_object:
+  case file_magic::elf_core:
+    return createELFObjectFile(Object);
+  case file_magic::macho_object:
+  case file_magic::macho_executable:
+  case file_magic::macho_fixed_virtual_memory_shared_lib:
+  case file_magic::macho_core:
+  case file_magic::macho_preload_executable:
+  case file_magic::macho_dynamically_linked_shared_lib:
+  case file_magic::macho_dynamic_linker:
+  case file_magic::macho_bundle:
+  case file_magic::macho_dynamically_linked_shared_lib_stub:
+  case file_magic::macho_dsym_companion:
+  case file_magic::macho_kext_bundle:
+    return createMachOObjectFile(Object);
+  case file_magic::coff_object:
+  case file_magic::coff_import_library:
+  case file_magic::pecoff_executable:
+    return createCOFFObjectFile(Object);
+  case file_magic::xcoff_object_32:
+    return createXCOFFObjectFile(Object, Binary::ID_XCOFF32);
+  case file_magic::xcoff_object_64:
+    return createXCOFFObjectFile(Object, Binary::ID_XCOFF64);
+  case file_magic::wasm_object:
+    return createWasmObjectFile(Object);
+  }
+  llvm_unreachable("Unexpected Object File Type");
+}
+
+Expected<OwningBinary<ObjectFile>>
+ObjectFile::createObjectFile(StringRef ObjectPath) {
+  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
+      MemoryBuffer::getFile(ObjectPath);
+  if (std::error_code EC = FileOrErr.getError())
+    return errorCodeToError(EC);
+  std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
+
+  Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
+      createObjectFile(Buffer->getMemBufferRef());
+  if (Error Err = ObjOrErr.takeError())
+    return std::move(Err);
+  std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
+
+  return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));
+}