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//===- MachOObjectFile.cpp - Mach-O object file binding ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the MachOObjectFile class, which binds the MachOObject
// class to the generic ObjectFile wrapper.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/MachO.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Object/MachOFormat.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MemoryBuffer.h"
#include <cctype>
#include <cstring>
#include <limits>
using namespace llvm;
using namespace object;
namespace llvm {
namespace object {
MachOObjectFileBase::MachOObjectFileBase(MemoryBuffer *Object,
bool IsLittleEndian, bool Is64bits,
error_code &ec)
: ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object) {
}
bool MachOObjectFileBase::is64Bit() const {
return isa<MachOObjectFileLE64>(this) || isa<MachOObjectFileBE64>(this);
}
void MachOObjectFileBase::ReadULEB128s(uint64_t Index,
SmallVectorImpl<uint64_t> &Out) const {
DataExtractor extractor(ObjectFile::getData(), true, 0);
uint32_t offset = Index;
uint64_t data = 0;
while (uint64_t delta = extractor.getULEB128(&offset)) {
data += delta;
Out.push_back(data);
}
}
unsigned MachOObjectFileBase::getHeaderSize() const {
return is64Bit() ? macho::Header64Size : macho::Header32Size;
}
StringRef MachOObjectFileBase::getData(size_t Offset, size_t Size) const {
return ObjectFile::getData().substr(Offset, Size);
}
ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
StringRef Magic = Buffer->getBuffer().slice(0, 4);
error_code ec;
ObjectFile *Ret;
if (Magic == "\xFE\xED\xFA\xCE")
Ret = new MachOObjectFileBE32(Buffer, ec);
else if (Magic == "\xCE\xFA\xED\xFE")
Ret = new MachOObjectFileLE32(Buffer, ec);
else if (Magic == "\xFE\xED\xFA\xCF")
Ret = new MachOObjectFileBE64(Buffer, ec);
else if (Magic == "\xCF\xFA\xED\xFE")
Ret = new MachOObjectFileLE64(Buffer, ec);
else
return NULL;
if (ec)
return NULL;
return Ret;
}
/*===-- Symbols -----------------------------------------------------------===*/
error_code MachOObjectFileBase::getSymbolValue(DataRefImpl Symb,
uint64_t &Val) const {
report_fatal_error("getSymbolValue unimplemented in MachOObjectFileBase");
}
symbol_iterator MachOObjectFileBase::begin_dynamic_symbols() const {
// TODO: implement
report_fatal_error("Dynamic symbols unimplemented in MachOObjectFileBase");
}
symbol_iterator MachOObjectFileBase::end_dynamic_symbols() const {
// TODO: implement
report_fatal_error("Dynamic symbols unimplemented in MachOObjectFileBase");
}
library_iterator MachOObjectFileBase::begin_libraries_needed() const {
// TODO: implement
report_fatal_error("Needed libraries unimplemented in MachOObjectFileBase");
}
library_iterator MachOObjectFileBase::end_libraries_needed() const {
// TODO: implement
report_fatal_error("Needed libraries unimplemented in MachOObjectFileBase");
}
StringRef MachOObjectFileBase::getLoadName() const {
// TODO: Implement
report_fatal_error("get_load_name() unimplemented in MachOObjectFileBase");
}
/*===-- Sections ----------------------------------------------------------===*/
std::size_t MachOObjectFileBase::getSectionIndex(DataRefImpl Sec) const {
SectionList::const_iterator loc =
std::find(Sections.begin(), Sections.end(), Sec);
assert(loc != Sections.end() && "Sec is not a valid section!");
return std::distance(Sections.begin(), loc);
}
StringRef MachOObjectFileBase::parseSegmentOrSectionName(const char *P) const {
if (P[15] == 0)
// Null terminated.
return P;
// Not null terminated, so this is a 16 char string.
return StringRef(P, 16);
}
error_code MachOObjectFileBase::isSectionData(DataRefImpl DRI,
bool &Result) const {
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code MachOObjectFileBase::isSectionBSS(DataRefImpl DRI,
bool &Result) const {
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code
MachOObjectFileBase::isSectionRequiredForExecution(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented.
Result = true;
return object_error::success;
}
error_code MachOObjectFileBase::isSectionVirtual(DataRefImpl Sec,
bool &Result) const {
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
error_code MachOObjectFileBase::isSectionReadOnlyData(DataRefImpl Sec,
bool &Result) const {
// Consider using the code from isSectionText to look for __const sections.
// Alternately, emit S_ATTR_PURE_INSTRUCTIONS and/or S_ATTR_SOME_INSTRUCTIONS
// to use section attributes to distinguish code from data.
// FIXME: Unimplemented.
Result = false;
return object_error::success;
}
relocation_iterator MachOObjectFileBase::getSectionRelBegin(DataRefImpl Sec) const {
DataRefImpl ret;
ret.d.b = getSectionIndex(Sec);
return relocation_iterator(RelocationRef(ret, this));
}
/*===-- Relocations -------------------------------------------------------===*/
error_code MachOObjectFileBase::getRelocationNext(DataRefImpl Rel,
RelocationRef &Res) const {
++Rel.d.a;
Res = RelocationRef(Rel, this);
return object_error::success;
}
error_code MachOObjectFileBase::getLibraryNext(DataRefImpl LibData,
LibraryRef &Res) const {
report_fatal_error("Needed libraries unimplemented in MachOObjectFileBase");
}
error_code MachOObjectFileBase::getLibraryPath(DataRefImpl LibData,
StringRef &Res) const {
report_fatal_error("Needed libraries unimplemented in MachOObjectFileBase");
}
error_code MachOObjectFileBase::getRelocationAdditionalInfo(DataRefImpl Rel,
int64_t &Res) const {
Res = 0;
return object_error::success;
}
/*===-- Miscellaneous -----------------------------------------------------===*/
uint8_t MachOObjectFileBase::getBytesInAddress() const {
return is64Bit() ? 8 : 4;
}
} // end namespace object
} // end namespace llvm
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