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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/ADT/Triple.h"
#include "llvm/Object/MachOFormat.h"
#include "llvm/Object/MachOObject.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MachO.h"
#include <cctype>
#include <cstring>
#include <limits>
using namespace llvm;
using namespace object;
namespace llvm {
typedef MachOObject::LoadCommandInfo LoadCommandInfo;
class MachOObjectFile : public ObjectFile {
public:
MachOObjectFile(MemoryBuffer *Object, MachOObject *MOO, error_code &ec)
: ObjectFile(Binary::isMachO, Object, ec),
MachOObj(MOO),
RegisteredStringTable(std::numeric_limits<uint32_t>::max()) {}
virtual symbol_iterator begin_symbols() const;
virtual symbol_iterator end_symbols() const;
virtual section_iterator begin_sections() const;
virtual section_iterator end_sections() const;
virtual uint8_t getBytesInAddress() const;
virtual StringRef getFileFormatName() const;
virtual unsigned getArch() const;
protected:
virtual SymbolRef getSymbolNext(DataRefImpl Symb) const;
virtual StringRef getSymbolName(DataRefImpl Symb) const;
virtual uint64_t getSymbolAddress(DataRefImpl Symb) const;
virtual uint64_t getSymbolSize(DataRefImpl Symb) const;
virtual char getSymbolNMTypeChar(DataRefImpl Symb) const;
virtual bool isSymbolInternal(DataRefImpl Symb) const;
virtual SectionRef getSectionNext(DataRefImpl Sec) const;
virtual StringRef getSectionName(DataRefImpl Sec) const;
virtual uint64_t getSectionAddress(DataRefImpl Sec) const;
virtual uint64_t getSectionSize(DataRefImpl Sec) const;
virtual StringRef getSectionContents(DataRefImpl Sec) const;
virtual bool isSectionText(DataRefImpl Sec) const;
private:
MachOObject *MachOObj;
mutable uint32_t RegisteredStringTable;
void moveToNextSection(DataRefImpl &DRI) const;
void getSymbolTableEntry(DataRefImpl DRI,
InMemoryStruct<macho::SymbolTableEntry> &Res) const;
void moveToNextSymbol(DataRefImpl &DRI) const;
void getSection(DataRefImpl DRI, InMemoryStruct<macho::Section> &Res) const;
};
ObjectFile *ObjectFile::createMachOObjectFile(MemoryBuffer *Buffer) {
error_code ec;
std::string Err;
MachOObject *MachOObj = MachOObject::LoadFromBuffer(Buffer, &Err);
if (!MachOObj)
return NULL;
return new MachOObjectFile(Buffer, MachOObj, ec);
}
/*===-- Symbols -----------------------------------------------------------===*/
void MachOObjectFile::moveToNextSymbol(DataRefImpl &DRI) const {
uint32_t LoadCommandCount = MachOObj->getHeader().NumLoadCommands;
while (DRI.d.a < LoadCommandCount) {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
if (LCI.Command.Type == macho::LCT_Symtab) {
InMemoryStruct<macho::SymtabLoadCommand> SymtabLoadCmd;
MachOObj->ReadSymtabLoadCommand(LCI, SymtabLoadCmd);
if (DRI.d.b < SymtabLoadCmd->NumSymbolTableEntries)
return;
}
DRI.d.a++;
DRI.d.b = 0;
}
}
void MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI,
InMemoryStruct<macho::SymbolTableEntry> &Res) const {
InMemoryStruct<macho::SymtabLoadCommand> SymtabLoadCmd;
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
MachOObj->ReadSymtabLoadCommand(LCI, SymtabLoadCmd);
if (RegisteredStringTable != DRI.d.a) {
MachOObj->RegisterStringTable(*SymtabLoadCmd);
RegisteredStringTable = DRI.d.a;
}
MachOObj->ReadSymbolTableEntry(SymtabLoadCmd->SymbolTableOffset, DRI.d.b,
Res);
}
SymbolRef MachOObjectFile::getSymbolNext(DataRefImpl DRI) const {
DRI.d.b++;
moveToNextSymbol(DRI);
return SymbolRef(DRI, this);
}
StringRef MachOObjectFile::getSymbolName(DataRefImpl DRI) const {
InMemoryStruct<macho::SymbolTableEntry> Entry;
getSymbolTableEntry(DRI, Entry);
return MachOObj->getStringAtIndex(Entry->StringIndex);
}
uint64_t MachOObjectFile::getSymbolAddress(DataRefImpl DRI) const {
InMemoryStruct<macho::SymbolTableEntry> Entry;
getSymbolTableEntry(DRI, Entry);
return Entry->Value;
}
uint64_t MachOObjectFile::getSymbolSize(DataRefImpl DRI) const {
return UnknownAddressOrSize;
}
char MachOObjectFile::getSymbolNMTypeChar(DataRefImpl DRI) const {
InMemoryStruct<macho::SymbolTableEntry> Entry;
getSymbolTableEntry(DRI, Entry);
char Char;
switch (Entry->Type & macho::STF_TypeMask) {
case macho::STT_Undefined:
Char = 'u';
break;
case macho::STT_Absolute:
case macho::STT_Section:
Char = 's';
break;
default:
Char = '?';
break;
}
if (Entry->Flags & (macho::STF_External | macho::STF_PrivateExtern))
Char = toupper(Char);
return Char;
}
bool MachOObjectFile::isSymbolInternal(DataRefImpl DRI) const {
InMemoryStruct<macho::SymbolTableEntry> Entry;
getSymbolTableEntry(DRI, Entry);
return Entry->Flags & macho::STF_StabsEntryMask;
}
ObjectFile::symbol_iterator MachOObjectFile::begin_symbols() const {
// DRI.d.a = segment number; DRI.d.b = symbol index.
DataRefImpl DRI;
DRI.d.a = DRI.d.b = 0;
moveToNextSymbol(DRI);
return symbol_iterator(SymbolRef(DRI, this));
}
ObjectFile::symbol_iterator MachOObjectFile::end_symbols() const {
DataRefImpl DRI;
DRI.d.a = MachOObj->getHeader().NumLoadCommands;
DRI.d.b = 0;
return symbol_iterator(SymbolRef(DRI, this));
}
/*===-- Sections ----------------------------------------------------------===*/
void MachOObjectFile::moveToNextSection(DataRefImpl &DRI) const {
uint32_t LoadCommandCount = MachOObj->getHeader().NumLoadCommands;
while (DRI.d.a < LoadCommandCount) {
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
if (LCI.Command.Type == macho::LCT_Segment) {
InMemoryStruct<macho::SegmentLoadCommand> SegmentLoadCmd;
MachOObj->ReadSegmentLoadCommand(LCI, SegmentLoadCmd);
if (DRI.d.b < SegmentLoadCmd->NumSections)
return;
} else if (LCI.Command.Type == macho::LCT_Segment64) {
InMemoryStruct<macho::Segment64LoadCommand> Segment64LoadCmd;
MachOObj->ReadSegment64LoadCommand(LCI, Segment64LoadCmd);
if (DRI.d.b < Segment64LoadCmd->NumSections)
return;
}
DRI.d.a++;
DRI.d.b = 0;
}
}
SectionRef MachOObjectFile::getSectionNext(DataRefImpl DRI) const {
DRI.d.b++;
moveToNextSection(DRI);
return SectionRef(DRI, this);
}
void
MachOObjectFile::getSection(DataRefImpl DRI,
InMemoryStruct<macho::Section> &Res) const {
InMemoryStruct<macho::SegmentLoadCommand> SLC;
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
MachOObj->ReadSegmentLoadCommand(LCI, SLC);
MachOObj->ReadSection(LCI, DRI.d.b, Res);
}
StringRef MachOObjectFile::getSectionName(DataRefImpl DRI) const {
InMemoryStruct<macho::SegmentLoadCommand> SLC;
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
MachOObj->ReadSegmentLoadCommand(LCI, SLC);
InMemoryStruct<macho::Section> Sect;
MachOObj->ReadSection(LCI, DRI.d.b, Sect);
static char Result[34];
strcpy(Result, SLC->Name);
strcat(Result, ",");
strcat(Result, Sect->Name);
return StringRef(Result);
}
uint64_t MachOObjectFile::getSectionAddress(DataRefImpl DRI) const {
InMemoryStruct<macho::Section> Sect;
getSection(DRI, Sect);
return Sect->Address;
}
uint64_t MachOObjectFile::getSectionSize(DataRefImpl DRI) const {
InMemoryStruct<macho::Section> Sect;
getSection(DRI, Sect);
return Sect->Size;
}
StringRef MachOObjectFile::getSectionContents(DataRefImpl DRI) const {
InMemoryStruct<macho::Section> Sect;
getSection(DRI, Sect);
return MachOObj->getData(Sect->Offset, Sect->Size);
}
bool MachOObjectFile::isSectionText(DataRefImpl DRI) const {
InMemoryStruct<macho::SegmentLoadCommand> SLC;
LoadCommandInfo LCI = MachOObj->getLoadCommandInfo(DRI.d.a);
MachOObj->ReadSegmentLoadCommand(LCI, SLC);
return !strcmp(SLC->Name, "__TEXT");
}
ObjectFile::section_iterator MachOObjectFile::begin_sections() const {
DataRefImpl DRI;
DRI.d.a = DRI.d.b = 0;
moveToNextSection(DRI);
return section_iterator(SectionRef(DRI, this));
}
ObjectFile::section_iterator MachOObjectFile::end_sections() const {
DataRefImpl DRI;
DRI.d.a = MachOObj->getHeader().NumLoadCommands;
DRI.d.b = 0;
return section_iterator(SectionRef(DRI, this));
}
/*===-- Miscellaneous -----------------------------------------------------===*/
uint8_t MachOObjectFile::getBytesInAddress() const {
return MachOObj->is64Bit() ? 8 : 4;
}
StringRef MachOObjectFile::getFileFormatName() const {
if (!MachOObj->is64Bit()) {
switch (MachOObj->getHeader().CPUType) {
case llvm::MachO::CPUTypeI386:
return "Mach-O 32-bit i386";
case llvm::MachO::CPUTypeARM:
return "Mach-O arm";
case llvm::MachO::CPUTypePowerPC:
return "Mach-O 32-bit ppc";
default:
assert((MachOObj->getHeader().CPUType & llvm::MachO::CPUArchABI64) == 0 &&
"64-bit object file when we're not 64-bit?");
return "Mach-O 32-bit unknown";
}
}
switch (MachOObj->getHeader().CPUType) {
case llvm::MachO::CPUTypeX86_64:
return "Mach-O 64-bit x86-64";
case llvm::MachO::CPUTypePowerPC64:
return "Mach-O 64-bit ppc64";
default:
assert((MachOObj->getHeader().CPUType & llvm::MachO::CPUArchABI64) == 1 &&
"32-bit object file when we're 64-bit?");
return "Mach-O 64-bit unknown";
}
}
unsigned MachOObjectFile::getArch() const {
switch (MachOObj->getHeader().CPUType) {
case llvm::MachO::CPUTypeI386:
return Triple::x86;
case llvm::MachO::CPUTypeX86_64:
return Triple::x86_64;
case llvm::MachO::CPUTypeARM:
return Triple::arm;
case llvm::MachO::CPUTypePowerPC:
return Triple::ppc;
case llvm::MachO::CPUTypePowerPC64:
return Triple::ppc64;
default:
return Triple::UnknownArch;
}
}
} // end namespace llvm
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