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llvm-6502/lib/Object/MachOObjectFile.cpp
Rafael Espindola 821b06f3a8 Change how symbol sizes are handled in lib/Object. 
COFF and MachO only define symbol sizes for common symbols. Reflect that
in the class hierarchy by having a method for common symbols only in the base
and a general one in ELF.

This avoids the need of using a magic value for the size, which had a few
problems
* Most callers didn't check for it.
* The ones that did could not tell the magic value from a file actually having
  that value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240529 91177308-0d34-0410-b5e6-96231b3b80d8
2015-06-24 10:20:30 +00:00

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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/STLExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MachO.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
#include <cstring>
#include <limits>
using namespace llvm;
using namespace object;
namespace {
struct section_base {
char sectname[16];
char segname[16];
};
}
// FIXME: Replace all uses of this function with getStructOrErr.
template <typename T>
static T getStruct(const MachOObjectFile *O, const char *P) {
// Don't read before the beginning or past the end of the file
if (P < O->getData().begin() || P + sizeof(T) > O->getData().end())
report_fatal_error("Malformed MachO file.");
T Cmd;
memcpy(&Cmd, P, sizeof(T));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
MachO::swapStruct(Cmd);
return Cmd;
}
template <typename T>
static ErrorOr<T> getStructOrErr(const MachOObjectFile *O, const char *P) {
// Don't read before the beginning or past the end of the file
if (P < O->getData().begin() || P + sizeof(T) > O->getData().end())
return object_error::parse_failed;
T Cmd;
memcpy(&Cmd, P, sizeof(T));
if (O->isLittleEndian() != sys::IsLittleEndianHost)
MachO::swapStruct(Cmd);
return Cmd;
}
static const char *
getSectionPtr(const MachOObjectFile *O, MachOObjectFile::LoadCommandInfo L,
unsigned Sec) {
uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr);
bool Is64 = O->is64Bit();
unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) :
sizeof(MachO::segment_command);
unsigned SectionSize = Is64 ? sizeof(MachO::section_64) :
sizeof(MachO::section);
uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize;
return reinterpret_cast<const char*>(SectionAddr);
}
static const char *getPtr(const MachOObjectFile *O, size_t Offset) {
return O->getData().substr(Offset, 1).data();
}
static MachO::nlist_base
getSymbolTableEntryBase(const MachOObjectFile *O, DataRefImpl DRI) {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist_base>(O, P);
}
static StringRef parseSegmentOrSectionName(const char *P) {
if (P[15] == 0)
// Null terminated.
return P;
// Not null terminated, so this is a 16 char string.
return StringRef(P, 16);
}
// Helper to advance a section or symbol iterator multiple increments at a time.
template<class T>
static void advance(T &it, size_t Val) {
while (Val--)
++it;
}
static unsigned getCPUType(const MachOObjectFile *O) {
return O->getHeader().cputype;
}
static uint32_t
getPlainRelocationAddress(const MachO::any_relocation_info &RE) {
return RE.r_word0;
}
static unsigned
getScatteredRelocationAddress(const MachO::any_relocation_info &RE) {
return RE.r_word0 & 0xffffff;
}
static bool getPlainRelocationPCRel(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
if (O->isLittleEndian())
return (RE.r_word1 >> 24) & 1;
return (RE.r_word1 >> 7) & 1;
}
static bool
getScatteredRelocationPCRel(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
return (RE.r_word0 >> 30) & 1;
}
static unsigned getPlainRelocationLength(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
if (O->isLittleEndian())
return (RE.r_word1 >> 25) & 3;
return (RE.r_word1 >> 5) & 3;
}
static unsigned
getScatteredRelocationLength(const MachO::any_relocation_info &RE) {
return (RE.r_word0 >> 28) & 3;
}
static unsigned getPlainRelocationType(const MachOObjectFile *O,
const MachO::any_relocation_info &RE) {
if (O->isLittleEndian())
return RE.r_word1 >> 28;
return RE.r_word1 & 0xf;
}
static uint32_t getSectionFlags(const MachOObjectFile *O,
DataRefImpl Sec) {
if (O->is64Bit()) {
MachO::section_64 Sect = O->getSection64(Sec);
return Sect.flags;
}
MachO::section Sect = O->getSection(Sec);
return Sect.flags;
}
static ErrorOr<MachOObjectFile::LoadCommandInfo>
getLoadCommandInfo(const MachOObjectFile *Obj, const char *Ptr) {
auto CmdOrErr = getStructOrErr<MachO::load_command>(Obj, Ptr);
if (!CmdOrErr)
return CmdOrErr.getError();
if (CmdOrErr->cmdsize < 8)
return object_error::macho_small_load_command;
MachOObjectFile::LoadCommandInfo Load;
Load.Ptr = Ptr;
Load.C = CmdOrErr.get();
return Load;
}
static ErrorOr<MachOObjectFile::LoadCommandInfo>
getFirstLoadCommandInfo(const MachOObjectFile *Obj) {
unsigned HeaderSize = Obj->is64Bit() ? sizeof(MachO::mach_header_64)
: sizeof(MachO::mach_header);
return getLoadCommandInfo(Obj, getPtr(Obj, HeaderSize));
}
static ErrorOr<MachOObjectFile::LoadCommandInfo>
getNextLoadCommandInfo(const MachOObjectFile *Obj,
const MachOObjectFile::LoadCommandInfo &L) {
return getLoadCommandInfo(Obj, L.Ptr + L.C.cmdsize);
}
template <typename T>
static void parseHeader(const MachOObjectFile *Obj, T &Header,
std::error_code &EC) {
auto HeaderOrErr = getStructOrErr<T>(Obj, getPtr(Obj, 0));
if (HeaderOrErr)
Header = HeaderOrErr.get();
else
EC = HeaderOrErr.getError();
}
// Parses LC_SEGMENT or LC_SEGMENT_64 load command, adds addresses of all
// sections to \param Sections, and optionally sets
// \param IsPageZeroSegment to true.
template <typename SegmentCmd>
static std::error_code parseSegmentLoadCommand(
const MachOObjectFile *Obj, const MachOObjectFile::LoadCommandInfo &Load,
SmallVectorImpl<const char *> &Sections, bool &IsPageZeroSegment) {
const unsigned SegmentLoadSize = sizeof(SegmentCmd);
if (Load.C.cmdsize < SegmentLoadSize)
return object_error::macho_load_segment_too_small;
auto SegOrErr = getStructOrErr<SegmentCmd>(Obj, Load.Ptr);
if (!SegOrErr)
return SegOrErr.getError();
SegmentCmd S = SegOrErr.get();
const unsigned SectionSize =
Obj->is64Bit() ? sizeof(MachO::section_64) : sizeof(MachO::section);
if (S.nsects > std::numeric_limits<uint32_t>::max() / SectionSize ||
S.nsects * SectionSize > Load.C.cmdsize - SegmentLoadSize)
return object_error::macho_load_segment_too_many_sections;
for (unsigned J = 0; J < S.nsects; ++J) {
const char *Sec = getSectionPtr(Obj, Load, J);
Sections.push_back(Sec);
}
IsPageZeroSegment |= StringRef("__PAGEZERO").equals(S.segname);
return std::error_code();
}
MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
bool Is64bits, std::error_code &EC)
: ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
SymtabLoadCmd(nullptr), DysymtabLoadCmd(nullptr),
DataInCodeLoadCmd(nullptr), LinkOptHintsLoadCmd(nullptr),
DyldInfoLoadCmd(nullptr), UuidLoadCmd(nullptr),
HasPageZeroSegment(false) {
if (is64Bit())
parseHeader(this, Header64, EC);
else
parseHeader(this, Header, EC);
if (EC)
return;
uint32_t LoadCommandCount = getHeader().ncmds;
if (LoadCommandCount == 0)
return;
auto LoadOrErr = getFirstLoadCommandInfo(this);
if (!LoadOrErr) {
EC = LoadOrErr.getError();
return;
}
LoadCommandInfo Load = LoadOrErr.get();
for (unsigned I = 0; I < LoadCommandCount; ++I) {
LoadCommands.push_back(Load);
if (Load.C.cmd == MachO::LC_SYMTAB) {
// Multiple symbol tables
if (SymtabLoadCmd) {
EC = object_error::parse_failed;
return;
}
SymtabLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
// Multiple dynamic symbol tables
if (DysymtabLoadCmd) {
EC = object_error::parse_failed;
return;
}
DysymtabLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
// Multiple data in code tables
if (DataInCodeLoadCmd) {
EC = object_error::parse_failed;
return;
}
DataInCodeLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_LINKER_OPTIMIZATION_HINT) {
// Multiple linker optimization hint tables
if (LinkOptHintsLoadCmd) {
EC = object_error::parse_failed;
return;
}
LinkOptHintsLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DYLD_INFO ||
Load.C.cmd == MachO::LC_DYLD_INFO_ONLY) {
// Multiple dyldinfo load commands
if (DyldInfoLoadCmd) {
EC = object_error::parse_failed;
return;
}
DyldInfoLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_UUID) {
// Multiple UUID load commands
if (UuidLoadCmd) {
EC = object_error::parse_failed;
return;
}
UuidLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_SEGMENT_64) {
if ((EC = parseSegmentLoadCommand<MachO::segment_command_64>(
this, Load, Sections, HasPageZeroSegment)))
return;
} else if (Load.C.cmd == MachO::LC_SEGMENT) {
if ((EC = parseSegmentLoadCommand<MachO::segment_command>(
this, Load, Sections, HasPageZeroSegment)))
return;
} else if (Load.C.cmd == MachO::LC_LOAD_DYLIB ||
Load.C.cmd == MachO::LC_LOAD_WEAK_DYLIB ||
Load.C.cmd == MachO::LC_LAZY_LOAD_DYLIB ||
Load.C.cmd == MachO::LC_REEXPORT_DYLIB ||
Load.C.cmd == MachO::LC_LOAD_UPWARD_DYLIB) {
Libraries.push_back(Load.Ptr);
}
if (I < LoadCommandCount - 1) {
auto LoadOrErr = getNextLoadCommandInfo(this, Load);
if (!LoadOrErr) {
EC = LoadOrErr.getError();
return;
}
Load = LoadOrErr.get();
}
}
assert(LoadCommands.size() == LoadCommandCount);
}
void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
Symb.p += SymbolTableEntrySize;
}
std::error_code MachOObjectFile::getSymbolName(DataRefImpl Symb,
StringRef &Res) const {
StringRef StringTable = getStringTableData();
MachO::nlist_base Entry = getSymbolTableEntryBase(this, Symb);
const char *Start = &StringTable.data()[Entry.n_strx];
if (Start < getData().begin() || Start >= getData().end())
report_fatal_error(
"Symbol name entry points before beginning or past end of file.");
Res = StringRef(Start);
return std::error_code();
}
unsigned MachOObjectFile::getSectionType(SectionRef Sec) const {
DataRefImpl DRI = Sec.getRawDataRefImpl();
uint32_t Flags = getSectionFlags(this, DRI);
return Flags & MachO::SECTION_TYPE;
}
// getIndirectName() returns the name of the alias'ed symbol who's string table
// index is in the n_value field.
std::error_code MachOObjectFile::getIndirectName(DataRefImpl Symb,
StringRef &Res) const {
StringRef StringTable = getStringTableData();
uint64_t NValue;
if (is64Bit()) {
MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
NValue = Entry.n_value;
if ((Entry.n_type & MachO::N_TYPE) != MachO::N_INDR)
return object_error::parse_failed;
} else {
MachO::nlist Entry = getSymbolTableEntry(Symb);
NValue = Entry.n_value;
if ((Entry.n_type & MachO::N_TYPE) != MachO::N_INDR)
return object_error::parse_failed;
}
if (NValue >= StringTable.size())
return object_error::parse_failed;
const char *Start = &StringTable.data()[NValue];
Res = StringRef(Start);
return std::error_code();
}
std::error_code MachOObjectFile::getSymbolAddress(DataRefImpl Symb,
uint64_t &Res) const {
if (is64Bit()) {
MachO::nlist_64 Entry = getSymbol64TableEntry(Symb);
if ((Entry.n_type & MachO::N_TYPE) == MachO::N_UNDF &&
Entry.n_value == 0)
Res = UnknownAddress;
else
Res = Entry.n_value;
} else {
MachO::nlist Entry = getSymbolTableEntry(Symb);
if ((Entry.n_type & MachO::N_TYPE) == MachO::N_UNDF &&
Entry.n_value == 0)
Res = UnknownAddress;
else
Res = Entry.n_value;
}
return std::error_code();
}
uint32_t MachOObjectFile::getSymbolAlignment(DataRefImpl DRI) const {
uint32_t flags = getSymbolFlags(DRI);
if (flags & SymbolRef::SF_Common) {
MachO::nlist_base Entry = getSymbolTableEntryBase(this, DRI);
return 1 << MachO::GET_COMM_ALIGN(Entry.n_desc);
}
return 0;
}
uint64_t MachOObjectFile::getCommonSymbolSizeImpl(DataRefImpl DRI) const {
uint64_t Value;
getSymbolAddress(DRI, Value);
return Value;
}
std::error_code MachOObjectFile::getSymbolType(DataRefImpl Symb,
SymbolRef::Type &Res) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(this, Symb);
uint8_t n_type = Entry.n_type;
Res = SymbolRef::ST_Other;
// If this is a STAB debugging symbol, we can do nothing more.
if (n_type & MachO::N_STAB) {
Res = SymbolRef::ST_Debug;
return std::error_code();
}
switch (n_type & MachO::N_TYPE) {
case MachO::N_UNDF :
Res = SymbolRef::ST_Unknown;
break;
case MachO::N_SECT :
Res = SymbolRef::ST_Function;
break;
}
return std::error_code();
}
uint32_t MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(this, DRI);
uint8_t MachOType = Entry.n_type;
uint16_t MachOFlags = Entry.n_desc;
uint32_t Result = SymbolRef::SF_None;
if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF)
Result |= SymbolRef::SF_Undefined;
if ((MachOType & MachO::N_TYPE) == MachO::N_INDR)
Result |= SymbolRef::SF_Indirect;
if (MachOType & MachO::N_STAB)
Result |= SymbolRef::SF_FormatSpecific;
if (MachOType & MachO::N_EXT) {
Result |= SymbolRef::SF_Global;
if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) {
uint64_t Value;
getSymbolAddress(DRI, Value);
if (Value && Value != UnknownAddress)
Result |= SymbolRef::SF_Common;
}
if (!(MachOType & MachO::N_PEXT))
Result |= SymbolRef::SF_Exported;
}
if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF))
Result |= SymbolRef::SF_Weak;
if (MachOFlags & (MachO::N_ARM_THUMB_DEF))
Result |= SymbolRef::SF_Thumb;
if ((MachOType & MachO::N_TYPE) == MachO::N_ABS)
Result |= SymbolRef::SF_Absolute;
return Result;
}
std::error_code MachOObjectFile::getSymbolSection(DataRefImpl Symb,
section_iterator &Res) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(this, Symb);
uint8_t index = Entry.n_sect;
if (index == 0) {
Res = section_end();
} else {
DataRefImpl DRI;
DRI.d.a = index - 1;
if (DRI.d.a >= Sections.size())
report_fatal_error("getSymbolSection: Invalid section index.");
Res = section_iterator(SectionRef(DRI, this));
}
return std::error_code();
}
void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const {
Sec.d.a++;
}
std::error_code MachOObjectFile::getSectionName(DataRefImpl Sec,
StringRef &Result) const {
ArrayRef<char> Raw = getSectionRawName(Sec);
Result = parseSegmentOrSectionName(Raw.data());
return std::error_code();
}
uint64_t MachOObjectFile::getSectionAddress(DataRefImpl Sec) const {
if (is64Bit())
return getSection64(Sec).addr;
return getSection(Sec).addr;
}
uint64_t MachOObjectFile::getSectionSize(DataRefImpl Sec) const {
if (is64Bit())
return getSection64(Sec).size;
return getSection(Sec).size;
}
std::error_code MachOObjectFile::getSectionContents(DataRefImpl Sec,
StringRef &Res) const {
uint32_t Offset;
uint64_t Size;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Offset = Sect.offset;
Size = Sect.size;
} else {
MachO::section Sect = getSection(Sec);
Offset = Sect.offset;
Size = Sect.size;
}
Res = this->getData().substr(Offset, Size);
return std::error_code();
}
uint64_t MachOObjectFile::getSectionAlignment(DataRefImpl Sec) const {
uint32_t Align;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Align = Sect.align;
} else {
MachO::section Sect = getSection(Sec);
Align = Sect.align;
}
return uint64_t(1) << Align;
}
bool MachOObjectFile::isSectionText(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(this, Sec);
return Flags & MachO::S_ATTR_PURE_INSTRUCTIONS;
}
bool MachOObjectFile::isSectionData(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(this, Sec);
unsigned SectionType = Flags & MachO::SECTION_TYPE;
return !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
!(SectionType == MachO::S_ZEROFILL ||
SectionType == MachO::S_GB_ZEROFILL);
}
bool MachOObjectFile::isSectionBSS(DataRefImpl Sec) const {
uint32_t Flags = getSectionFlags(this, Sec);
unsigned SectionType = Flags & MachO::SECTION_TYPE;
return !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) &&
(SectionType == MachO::S_ZEROFILL ||
SectionType == MachO::S_GB_ZEROFILL);
}
bool MachOObjectFile::isSectionVirtual(DataRefImpl Sec) const {
// FIXME: Unimplemented.
return false;
}
bool MachOObjectFile::sectionContainsSymbol(DataRefImpl Sec,
DataRefImpl Symb) const {
SymbolRef::Type ST;
this->getSymbolType(Symb, ST);
if (ST == SymbolRef::ST_Unknown)
return false;
uint64_t SectBegin = getSectionAddress(Sec);
uint64_t SectEnd = getSectionSize(Sec);
SectEnd += SectBegin;
uint64_t SymAddr;
getSymbolAddress(Symb, SymAddr);
return (SymAddr >= SectBegin) && (SymAddr < SectEnd);
}
relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const {
DataRefImpl Ret;
Ret.d.a = Sec.d.a;
Ret.d.b = 0;
return relocation_iterator(RelocationRef(Ret, this));
}
relocation_iterator
MachOObjectFile::section_rel_end(DataRefImpl Sec) const {
uint32_t Num;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Num = Sect.nreloc;
} else {
MachO::section Sect = getSection(Sec);
Num = Sect.nreloc;
}
DataRefImpl Ret;
Ret.d.a = Sec.d.a;
Ret.d.b = Num;
return relocation_iterator(RelocationRef(Ret, this));
}
void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
++Rel.d.b;
}
std::error_code MachOObjectFile::getRelocationAddress(DataRefImpl Rel,
uint64_t &Res) const {
uint64_t Offset;
getRelocationOffset(Rel, Offset);
DataRefImpl Sec;
Sec.d.a = Rel.d.a;
uint64_t SecAddress = getSectionAddress(Sec);
Res = SecAddress + Offset;
return std::error_code();
}
std::error_code MachOObjectFile::getRelocationOffset(DataRefImpl Rel,
uint64_t &Res) const {
assert(getHeader().filetype == MachO::MH_OBJECT &&
"Only implemented for MH_OBJECT");
MachO::any_relocation_info RE = getRelocation(Rel);
Res = getAnyRelocationAddress(RE);
return std::error_code();
}
symbol_iterator
MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
MachO::any_relocation_info RE = getRelocation(Rel);
if (isRelocationScattered(RE))
return symbol_end();
uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE);
bool isExtern = getPlainRelocationExternal(RE);
if (!isExtern)
return symbol_end();
MachO::symtab_command S = getSymtabLoadCommand();
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize;
DataRefImpl Sym;
Sym.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return symbol_iterator(SymbolRef(Sym, this));
}
section_iterator
MachOObjectFile::getRelocationSection(DataRefImpl Rel) const {
return section_iterator(getAnyRelocationSection(getRelocation(Rel)));
}
std::error_code MachOObjectFile::getRelocationType(DataRefImpl Rel,
uint64_t &Res) const {
MachO::any_relocation_info RE = getRelocation(Rel);
Res = getAnyRelocationType(RE);
return std::error_code();
}
std::error_code
MachOObjectFile::getRelocationTypeName(DataRefImpl Rel,
SmallVectorImpl<char> &Result) const {
StringRef res;
uint64_t RType;
getRelocationType(Rel, RType);
unsigned Arch = this->getArch();
switch (Arch) {
case Triple::x86: {
static const char *const Table[] = {
"GENERIC_RELOC_VANILLA",
"GENERIC_RELOC_PAIR",
"GENERIC_RELOC_SECTDIFF",
"GENERIC_RELOC_PB_LA_PTR",
"GENERIC_RELOC_LOCAL_SECTDIFF",
"GENERIC_RELOC_TLV" };
if (RType > 5)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::x86_64: {
static const char *const Table[] = {
"X86_64_RELOC_UNSIGNED",
"X86_64_RELOC_SIGNED",
"X86_64_RELOC_BRANCH",
"X86_64_RELOC_GOT_LOAD",
"X86_64_RELOC_GOT",
"X86_64_RELOC_SUBTRACTOR",
"X86_64_RELOC_SIGNED_1",
"X86_64_RELOC_SIGNED_2",
"X86_64_RELOC_SIGNED_4",
"X86_64_RELOC_TLV" };
if (RType > 9)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::arm: {
static const char *const Table[] = {
"ARM_RELOC_VANILLA",
"ARM_RELOC_PAIR",
"ARM_RELOC_SECTDIFF",
"ARM_RELOC_LOCAL_SECTDIFF",
"ARM_RELOC_PB_LA_PTR",
"ARM_RELOC_BR24",
"ARM_THUMB_RELOC_BR22",
"ARM_THUMB_32BIT_BRANCH",
"ARM_RELOC_HALF",
"ARM_RELOC_HALF_SECTDIFF" };
if (RType > 9)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::aarch64: {
static const char *const Table[] = {
"ARM64_RELOC_UNSIGNED", "ARM64_RELOC_SUBTRACTOR",
"ARM64_RELOC_BRANCH26", "ARM64_RELOC_PAGE21",
"ARM64_RELOC_PAGEOFF12", "ARM64_RELOC_GOT_LOAD_PAGE21",
"ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT",
"ARM64_RELOC_TLVP_LOAD_PAGE21", "ARM64_RELOC_TLVP_LOAD_PAGEOFF12",
"ARM64_RELOC_ADDEND"
};
if (RType >= array_lengthof(Table))
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::ppc: {
static const char *const Table[] = {
"PPC_RELOC_VANILLA",
"PPC_RELOC_PAIR",
"PPC_RELOC_BR14",
"PPC_RELOC_BR24",
"PPC_RELOC_HI16",
"PPC_RELOC_LO16",
"PPC_RELOC_HA16",
"PPC_RELOC_LO14",
"PPC_RELOC_SECTDIFF",
"PPC_RELOC_PB_LA_PTR",
"PPC_RELOC_HI16_SECTDIFF",
"PPC_RELOC_LO16_SECTDIFF",
"PPC_RELOC_HA16_SECTDIFF",
"PPC_RELOC_JBSR",
"PPC_RELOC_LO14_SECTDIFF",
"PPC_RELOC_LOCAL_SECTDIFF" };
if (RType > 15)
res = "Unknown";
else
res = Table[RType];
break;
}
case Triple::UnknownArch:
res = "Unknown";
break;
}
Result.append(res.begin(), res.end());
return std::error_code();
}
std::error_code MachOObjectFile::getRelocationHidden(DataRefImpl Rel,
bool &Result) const {
unsigned Arch = getArch();
uint64_t Type;
getRelocationType(Rel, Type);
Result = false;
// On arches that use the generic relocations, GENERIC_RELOC_PAIR
// is always hidden.
if (Arch == Triple::x86 || Arch == Triple::arm || Arch == Triple::ppc) {
if (Type == MachO::GENERIC_RELOC_PAIR) Result = true;
} else if (Arch == Triple::x86_64) {
// On x86_64, X86_64_RELOC_UNSIGNED is hidden only when it follows
// an X86_64_RELOC_SUBTRACTOR.
if (Type == MachO::X86_64_RELOC_UNSIGNED && Rel.d.a > 0) {
DataRefImpl RelPrev = Rel;
RelPrev.d.a--;
uint64_t PrevType;
getRelocationType(RelPrev, PrevType);
if (PrevType == MachO::X86_64_RELOC_SUBTRACTOR)
Result = true;
}
}
return std::error_code();
}
uint8_t MachOObjectFile::getRelocationLength(DataRefImpl Rel) const {
MachO::any_relocation_info RE = getRelocation(Rel);
return getAnyRelocationLength(RE);
}
//
// guessLibraryShortName() is passed a name of a dynamic library and returns a
// guess on what the short name is. Then name is returned as a substring of the
// StringRef Name passed in. The name of the dynamic library is recognized as
// a framework if it has one of the two following forms:
// Foo.framework/Versions/A/Foo
// Foo.framework/Foo
// Where A and Foo can be any string. And may contain a trailing suffix
// starting with an underbar. If the Name is recognized as a framework then
// isFramework is set to true else it is set to false. If the Name has a
// suffix then Suffix is set to the substring in Name that contains the suffix
// else it is set to a NULL StringRef.
//
// The Name of the dynamic library is recognized as a library name if it has
// one of the two following forms:
// libFoo.A.dylib
// libFoo.dylib
// The library may have a suffix trailing the name Foo of the form:
// libFoo_profile.A.dylib
// libFoo_profile.dylib
//
// The Name of the dynamic library is also recognized as a library name if it
// has the following form:
// Foo.qtx
//
// If the Name of the dynamic library is none of the forms above then a NULL
// StringRef is returned.
//
StringRef MachOObjectFile::guessLibraryShortName(StringRef Name,
bool &isFramework,
StringRef &Suffix) {
StringRef Foo, F, DotFramework, V, Dylib, Lib, Dot, Qtx;
size_t a, b, c, d, Idx;
isFramework = false;
Suffix = StringRef();
// Pull off the last component and make Foo point to it
a = Name.rfind('/');
if (a == Name.npos || a == 0)
goto guess_library;
Foo = Name.slice(a+1, Name.npos);
// Look for a suffix starting with a '_'
Idx = Foo.rfind('_');
if (Idx != Foo.npos && Foo.size() >= 2) {
Suffix = Foo.slice(Idx, Foo.npos);
Foo = Foo.slice(0, Idx);
}
// First look for the form Foo.framework/Foo
b = Name.rfind('/', a);
if (b == Name.npos)
Idx = 0;
else
Idx = b+1;
F = Name.slice(Idx, Idx + Foo.size());
DotFramework = Name.slice(Idx + Foo.size(),
Idx + Foo.size() + sizeof(".framework/")-1);
if (F == Foo && DotFramework == ".framework/") {
isFramework = true;
return Foo;
}
// Next look for the form Foo.framework/Versions/A/Foo
if (b == Name.npos)
goto guess_library;
c = Name.rfind('/', b);
if (c == Name.npos || c == 0)
goto guess_library;
V = Name.slice(c+1, Name.npos);
if (!V.startswith("Versions/"))
goto guess_library;
d = Name.rfind('/', c);
if (d == Name.npos)
Idx = 0;
else
Idx = d+1;
F = Name.slice(Idx, Idx + Foo.size());
DotFramework = Name.slice(Idx + Foo.size(),
Idx + Foo.size() + sizeof(".framework/")-1);
if (F == Foo && DotFramework == ".framework/") {
isFramework = true;
return Foo;
}
guess_library:
// pull off the suffix after the "." and make a point to it
a = Name.rfind('.');
if (a == Name.npos || a == 0)
return StringRef();
Dylib = Name.slice(a, Name.npos);
if (Dylib != ".dylib")
goto guess_qtx;
// First pull off the version letter for the form Foo.A.dylib if any.
if (a >= 3) {
Dot = Name.slice(a-2, a-1);
if (Dot == ".")
a = a - 2;
}
b = Name.rfind('/', a);
if (b == Name.npos)
b = 0;
else
b = b+1;
// ignore any suffix after an underbar like Foo_profile.A.dylib
Idx = Name.find('_', b);
if (Idx != Name.npos && Idx != b) {
Lib = Name.slice(b, Idx);
Suffix = Name.slice(Idx, a);
}
else
Lib = Name.slice(b, a);
// There are incorrect library names of the form:
// libATS.A_profile.dylib so check for these.
if (Lib.size() >= 3) {
Dot = Lib.slice(Lib.size()-2, Lib.size()-1);
if (Dot == ".")
Lib = Lib.slice(0, Lib.size()-2);
}
return Lib;
guess_qtx:
Qtx = Name.slice(a, Name.npos);
if (Qtx != ".qtx")
return StringRef();
b = Name.rfind('/', a);
if (b == Name.npos)
Lib = Name.slice(0, a);
else
Lib = Name.slice(b+1, a);
// There are library names of the form: QT.A.qtx so check for these.
if (Lib.size() >= 3) {
Dot = Lib.slice(Lib.size()-2, Lib.size()-1);
if (Dot == ".")
Lib = Lib.slice(0, Lib.size()-2);
}
return Lib;
}
// getLibraryShortNameByIndex() is used to get the short name of the library
// for an undefined symbol in a linked Mach-O binary that was linked with the
// normal two-level namespace default (that is MH_TWOLEVEL in the header).
// It is passed the index (0 - based) of the library as translated from
// GET_LIBRARY_ORDINAL (1 - based).
std::error_code MachOObjectFile::getLibraryShortNameByIndex(unsigned Index,
StringRef &Res) const {
if (Index >= Libraries.size())
return object_error::parse_failed;
// If the cache of LibrariesShortNames is not built up do that first for
// all the Libraries.
if (LibrariesShortNames.size() == 0) {
for (unsigned i = 0; i < Libraries.size(); i++) {
MachO::dylib_command D =
getStruct<MachO::dylib_command>(this, Libraries[i]);
if (D.dylib.name >= D.cmdsize)
return object_error::parse_failed;
const char *P = (const char *)(Libraries[i]) + D.dylib.name;
StringRef Name = StringRef(P);
if (D.dylib.name+Name.size() >= D.cmdsize)
return object_error::parse_failed;
StringRef Suffix;
bool isFramework;
StringRef shortName = guessLibraryShortName(Name, isFramework, Suffix);
if (shortName.empty())
LibrariesShortNames.push_back(Name);
else
LibrariesShortNames.push_back(shortName);
}
}
Res = LibrariesShortNames[Index];
return std::error_code();
}
basic_symbol_iterator MachOObjectFile::symbol_begin_impl() const {
return getSymbolByIndex(0);
}
basic_symbol_iterator MachOObjectFile::symbol_end_impl() const {
DataRefImpl DRI;
if (!SymtabLoadCmd)
return basic_symbol_iterator(SymbolRef(DRI, this));
MachO::symtab_command Symtab = getSymtabLoadCommand();
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
unsigned Offset = Symtab.symoff +
Symtab.nsyms * SymbolTableEntrySize;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return basic_symbol_iterator(SymbolRef(DRI, this));
}
basic_symbol_iterator MachOObjectFile::getSymbolByIndex(unsigned Index) const {
DataRefImpl DRI;
if (!SymtabLoadCmd)
return basic_symbol_iterator(SymbolRef(DRI, this));
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (Index >= Symtab.nsyms)
report_fatal_error("Requested symbol index is out of range.");
unsigned SymbolTableEntrySize =
is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Symtab.symoff));
DRI.p += Index * SymbolTableEntrySize;
return basic_symbol_iterator(SymbolRef(DRI, this));
}
section_iterator MachOObjectFile::section_begin() const {
DataRefImpl DRI;
return section_iterator(SectionRef(DRI, this));
}
section_iterator MachOObjectFile::section_end() const {
DataRefImpl DRI;
DRI.d.a = Sections.size();
return section_iterator(SectionRef(DRI, this));
}
uint8_t MachOObjectFile::getBytesInAddress() const {
return is64Bit() ? 8 : 4;
}
StringRef MachOObjectFile::getFileFormatName() const {
unsigned CPUType = getCPUType(this);
if (!is64Bit()) {
switch (CPUType) {
case llvm::MachO::CPU_TYPE_I386:
return "Mach-O 32-bit i386";
case llvm::MachO::CPU_TYPE_ARM:
return "Mach-O arm";
case llvm::MachO::CPU_TYPE_POWERPC:
return "Mach-O 32-bit ppc";
default:
return "Mach-O 32-bit unknown";
}
}
switch (CPUType) {
case llvm::MachO::CPU_TYPE_X86_64:
return "Mach-O 64-bit x86-64";
case llvm::MachO::CPU_TYPE_ARM64:
return "Mach-O arm64";
case llvm::MachO::CPU_TYPE_POWERPC64:
return "Mach-O 64-bit ppc64";
default:
return "Mach-O 64-bit unknown";
}
}
Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType) {
switch (CPUType) {
case llvm::MachO::CPU_TYPE_I386:
return Triple::x86;
case llvm::MachO::CPU_TYPE_X86_64:
return Triple::x86_64;
case llvm::MachO::CPU_TYPE_ARM:
return Triple::arm;
case llvm::MachO::CPU_TYPE_ARM64:
return Triple::aarch64;
case llvm::MachO::CPU_TYPE_POWERPC:
return Triple::ppc;
case llvm::MachO::CPU_TYPE_POWERPC64:
return Triple::ppc64;
default:
return Triple::UnknownArch;
}
}
Triple MachOObjectFile::getArch(uint32_t CPUType, uint32_t CPUSubType,
const char **McpuDefault) {
if (McpuDefault)
*McpuDefault = nullptr;
switch (CPUType) {
case MachO::CPU_TYPE_I386:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_I386_ALL:
return Triple("i386-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_X86_64:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_X86_64_ALL:
return Triple("x86_64-apple-darwin");
case MachO::CPU_SUBTYPE_X86_64_H:
return Triple("x86_64h-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_ARM:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_ARM_V4T:
return Triple("armv4t-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V5TEJ:
return Triple("armv5e-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_XSCALE:
return Triple("xscale-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V6:
return Triple("armv6-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V6M:
if (McpuDefault)
*McpuDefault = "cortex-m0";
return Triple("armv6m-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7:
return Triple("armv7-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7EM:
if (McpuDefault)
*McpuDefault = "cortex-m4";
return Triple("armv7em-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7K:
return Triple("armv7k-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7M:
if (McpuDefault)
*McpuDefault = "cortex-m3";
return Triple("armv7m-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7S:
return Triple("armv7s-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_ARM64:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_ARM64_ALL:
return Triple("arm64-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_POWERPC:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_POWERPC_ALL:
return Triple("ppc-apple-darwin");
default:
return Triple();
}
case MachO::CPU_TYPE_POWERPC64:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_POWERPC_ALL:
return Triple("ppc64-apple-darwin");
default:
return Triple();
}
default:
return Triple();
}
}
Triple MachOObjectFile::getThumbArch(uint32_t CPUType, uint32_t CPUSubType,
const char **McpuDefault) {
if (McpuDefault)
*McpuDefault = nullptr;
switch (CPUType) {
case MachO::CPU_TYPE_ARM:
switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) {
case MachO::CPU_SUBTYPE_ARM_V4T:
return Triple("thumbv4t-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V5TEJ:
return Triple("thumbv5e-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_XSCALE:
return Triple("xscale-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V6:
return Triple("thumbv6-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V6M:
if (McpuDefault)
*McpuDefault = "cortex-m0";
return Triple("thumbv6m-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7:
return Triple("thumbv7-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7EM:
if (McpuDefault)
*McpuDefault = "cortex-m4";
return Triple("thumbv7em-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7K:
return Triple("thumbv7k-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7M:
if (McpuDefault)
*McpuDefault = "cortex-m3";
return Triple("thumbv7m-apple-darwin");
case MachO::CPU_SUBTYPE_ARM_V7S:
return Triple("thumbv7s-apple-darwin");
default:
return Triple();
}
default:
return Triple();
}
}
Triple MachOObjectFile::getArch(uint32_t CPUType, uint32_t CPUSubType,
const char **McpuDefault,
Triple *ThumbTriple) {
Triple T = MachOObjectFile::getArch(CPUType, CPUSubType, McpuDefault);
*ThumbTriple = MachOObjectFile::getThumbArch(CPUType, CPUSubType,
McpuDefault);
return T;
}
Triple MachOObjectFile::getHostArch() {
return Triple(sys::getDefaultTargetTriple());
}
bool MachOObjectFile::isValidArch(StringRef ArchFlag) {
return StringSwitch<bool>(ArchFlag)
.Case("i386", true)
.Case("x86_64", true)
.Case("x86_64h", true)
.Case("armv4t", true)
.Case("arm", true)
.Case("armv5e", true)
.Case("armv6", true)
.Case("armv6m", true)
.Case("armv7", true)
.Case("armv7em", true)
.Case("armv7k", true)
.Case("armv7m", true)
.Case("armv7s", true)
.Case("arm64", true)
.Case("ppc", true)
.Case("ppc64", true)
.Default(false);
}
unsigned MachOObjectFile::getArch() const {
return getArch(getCPUType(this));
}
Triple MachOObjectFile::getArch(const char **McpuDefault,
Triple *ThumbTriple) const {
*ThumbTriple = getThumbArch(Header.cputype, Header.cpusubtype, McpuDefault);
return getArch(Header.cputype, Header.cpusubtype, McpuDefault);
}
relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const {
DataRefImpl DRI;
DRI.d.a = Index;
return section_rel_begin(DRI);
}
relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const {
DataRefImpl DRI;
DRI.d.a = Index;
return section_rel_end(DRI);
}
dice_iterator MachOObjectFile::begin_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, DicLC.dataoff));
return dice_iterator(DiceRef(DRI, this));
}
dice_iterator MachOObjectFile::end_dices() const {
DataRefImpl DRI;
if (!DataInCodeLoadCmd)
return dice_iterator(DiceRef(DRI, this));
MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand();
unsigned Offset = DicLC.dataoff + DicLC.datasize;
DRI.p = reinterpret_cast<uintptr_t>(getPtr(this, Offset));
return dice_iterator(DiceRef(DRI, this));
}
ExportEntry::ExportEntry(ArrayRef<uint8_t> T)
: Trie(T), Malformed(false), Done(false) { }
void ExportEntry::moveToFirst() {
pushNode(0);
pushDownUntilBottom();
}
void ExportEntry::moveToEnd() {
Stack.clear();
Done = true;
}
bool ExportEntry::operator==(const ExportEntry &Other) const {
// Common case, one at end, other iterating from begin.
if (Done || Other.Done)
return (Done == Other.Done);
// Not equal if different stack sizes.
if (Stack.size() != Other.Stack.size())
return false;
// Not equal if different cumulative strings.
if (!CumulativeString.equals(Other.CumulativeString))
return false;
// Equal if all nodes in both stacks match.
for (unsigned i=0; i < Stack.size(); ++i) {
if (Stack[i].Start != Other.Stack[i].Start)
return false;
}
return true;
}
uint64_t ExportEntry::readULEB128(const uint8_t *&Ptr) {
unsigned Count;
uint64_t Result = decodeULEB128(Ptr, &Count);
Ptr += Count;
if (Ptr > Trie.end()) {
Ptr = Trie.end();
Malformed = true;
}
return Result;
}
StringRef ExportEntry::name() const {
return CumulativeString;
}
uint64_t ExportEntry::flags() const {
return Stack.back().Flags;
}
uint64_t ExportEntry::address() const {
return Stack.back().Address;
}
uint64_t ExportEntry::other() const {
return Stack.back().Other;
}
StringRef ExportEntry::otherName() const {
const char* ImportName = Stack.back().ImportName;
if (ImportName)
return StringRef(ImportName);
return StringRef();
}
uint32_t ExportEntry::nodeOffset() const {
return Stack.back().Start - Trie.begin();
}
ExportEntry::NodeState::NodeState(const uint8_t *Ptr)
: Start(Ptr), Current(Ptr), Flags(0), Address(0), Other(0),
ImportName(nullptr), ChildCount(0), NextChildIndex(0),
ParentStringLength(0), IsExportNode(false) {
}
void ExportEntry::pushNode(uint64_t offset) {
const uint8_t *Ptr = Trie.begin() + offset;
NodeState State(Ptr);
uint64_t ExportInfoSize = readULEB128(State.Current);
State.IsExportNode = (ExportInfoSize != 0);
const uint8_t* Children = State.Current + ExportInfoSize;
if (State.IsExportNode) {
State.Flags = readULEB128(State.Current);
if (State.Flags & MachO::EXPORT_SYMBOL_FLAGS_REEXPORT) {
State.Address = 0;
State.Other = readULEB128(State.Current); // dylib ordinal
State.ImportName = reinterpret_cast<const char*>(State.Current);
} else {
State.Address = readULEB128(State.Current);
if (State.Flags & MachO::EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER)
State.Other = readULEB128(State.Current);
}
}
State.ChildCount = *Children;
State.Current = Children + 1;
State.NextChildIndex = 0;
State.ParentStringLength = CumulativeString.size();
Stack.push_back(State);
}
void ExportEntry::pushDownUntilBottom() {
while (Stack.back().NextChildIndex < Stack.back().ChildCount) {
NodeState &Top = Stack.back();
CumulativeString.resize(Top.ParentStringLength);
for (;*Top.Current != 0; Top.Current++) {
char C = *Top.Current;
CumulativeString.push_back(C);
}
Top.Current += 1;
uint64_t childNodeIndex = readULEB128(Top.Current);
Top.NextChildIndex += 1;
pushNode(childNodeIndex);
}
if (!Stack.back().IsExportNode) {
Malformed = true;
moveToEnd();
}
}
// We have a trie data structure and need a way to walk it that is compatible
// with the C++ iterator model. The solution is a non-recursive depth first
// traversal where the iterator contains a stack of parent nodes along with a
// string that is the accumulation of all edge strings along the parent chain
// to this point.
//
// There is one "export" node for each exported symbol. But because some
// symbols may be a prefix of another symbol (e.g. _dup and _dup2), an export
// node may have child nodes too.
//
// The algorithm for moveNext() is to keep moving down the leftmost unvisited
// child until hitting a node with no children (which is an export node or
// else the trie is malformed). On the way down, each node is pushed on the
// stack ivar. If there is no more ways down, it pops up one and tries to go
// down a sibling path until a childless node is reached.
void ExportEntry::moveNext() {
if (Stack.empty() || !Stack.back().IsExportNode) {
Malformed = true;
moveToEnd();
return;
}
Stack.pop_back();
while (!Stack.empty()) {
NodeState &Top = Stack.back();
if (Top.NextChildIndex < Top.ChildCount) {
pushDownUntilBottom();
// Now at the next export node.
return;
} else {
if (Top.IsExportNode) {
// This node has no children but is itself an export node.
CumulativeString.resize(Top.ParentStringLength);
return;
}
Stack.pop_back();
}
}
Done = true;
}
iterator_range<export_iterator>
MachOObjectFile::exports(ArrayRef<uint8_t> Trie) {
ExportEntry Start(Trie);
if (Trie.size() == 0)
Start.moveToEnd();
else
Start.moveToFirst();
ExportEntry Finish(Trie);
Finish.moveToEnd();
return iterator_range<export_iterator>(export_iterator(Start),
export_iterator(Finish));
}
iterator_range<export_iterator> MachOObjectFile::exports() const {
return exports(getDyldInfoExportsTrie());
}
MachORebaseEntry::MachORebaseEntry(ArrayRef<uint8_t> Bytes, bool is64Bit)
: Opcodes(Bytes), Ptr(Bytes.begin()), SegmentOffset(0), SegmentIndex(0),
RemainingLoopCount(0), AdvanceAmount(0), RebaseType(0),
PointerSize(is64Bit ? 8 : 4), Malformed(false), Done(false) {}
void MachORebaseEntry::moveToFirst() {
Ptr = Opcodes.begin();
moveNext();
}
void MachORebaseEntry::moveToEnd() {
Ptr = Opcodes.end();
RemainingLoopCount = 0;
Done = true;
}
void MachORebaseEntry::moveNext() {
// If in the middle of some loop, move to next rebasing in loop.
SegmentOffset += AdvanceAmount;
if (RemainingLoopCount) {
--RemainingLoopCount;
return;
}
if (Ptr == Opcodes.end()) {
Done = true;
return;
}
bool More = true;
while (More && !Malformed) {
// Parse next opcode and set up next loop.
uint8_t Byte = *Ptr++;
uint8_t ImmValue = Byte & MachO::REBASE_IMMEDIATE_MASK;
uint8_t Opcode = Byte & MachO::REBASE_OPCODE_MASK;
switch (Opcode) {
case MachO::REBASE_OPCODE_DONE:
More = false;
Done = true;
moveToEnd();
DEBUG_WITH_TYPE("mach-o-rebase", llvm::dbgs() << "REBASE_OPCODE_DONE\n");
break;
case MachO::REBASE_OPCODE_SET_TYPE_IMM:
RebaseType = ImmValue;
DEBUG_WITH_TYPE(
"mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_SET_TYPE_IMM: "
<< "RebaseType=" << (int) RebaseType << "\n");
break;
case MachO::REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
SegmentIndex = ImmValue;
SegmentOffset = readULEB128();
DEBUG_WITH_TYPE(
"mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: "
<< "SegmentIndex=" << SegmentIndex << ", "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< "\n");
break;
case MachO::REBASE_OPCODE_ADD_ADDR_ULEB:
SegmentOffset += readULEB128();
DEBUG_WITH_TYPE("mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
break;
case MachO::REBASE_OPCODE_ADD_ADDR_IMM_SCALED:
SegmentOffset += ImmValue * PointerSize;
DEBUG_WITH_TYPE("mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_ADD_ADDR_IMM_SCALED: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
break;
case MachO::REBASE_OPCODE_DO_REBASE_IMM_TIMES:
AdvanceAmount = PointerSize;
RemainingLoopCount = ImmValue - 1;
DEBUG_WITH_TYPE(
"mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_DO_REBASE_IMM_TIMES: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES:
AdvanceAmount = PointerSize;
RemainingLoopCount = readULEB128() - 1;
DEBUG_WITH_TYPE(
"mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_DO_REBASE_ULEB_TIMES: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:
AdvanceAmount = readULEB128() + PointerSize;
RemainingLoopCount = 0;
DEBUG_WITH_TYPE(
"mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:
RemainingLoopCount = readULEB128() - 1;
AdvanceAmount = readULEB128() + PointerSize;
DEBUG_WITH_TYPE(
"mach-o-rebase",
llvm::dbgs() << "REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
default:
Malformed = true;
}
}
}
uint64_t MachORebaseEntry::readULEB128() {
unsigned Count;
uint64_t Result = decodeULEB128(Ptr, &Count);
Ptr += Count;
if (Ptr > Opcodes.end()) {
Ptr = Opcodes.end();
Malformed = true;
}
return Result;
}
uint32_t MachORebaseEntry::segmentIndex() const { return SegmentIndex; }
uint64_t MachORebaseEntry::segmentOffset() const { return SegmentOffset; }
StringRef MachORebaseEntry::typeName() const {
switch (RebaseType) {
case MachO::REBASE_TYPE_POINTER:
return "pointer";
case MachO::REBASE_TYPE_TEXT_ABSOLUTE32:
return "text abs32";
case MachO::REBASE_TYPE_TEXT_PCREL32:
return "text rel32";
}
return "unknown";
}
bool MachORebaseEntry::operator==(const MachORebaseEntry &Other) const {
assert(Opcodes == Other.Opcodes && "compare iterators of different files");
return (Ptr == Other.Ptr) &&
(RemainingLoopCount == Other.RemainingLoopCount) &&
(Done == Other.Done);
}
iterator_range<rebase_iterator>
MachOObjectFile::rebaseTable(ArrayRef<uint8_t> Opcodes, bool is64) {
MachORebaseEntry Start(Opcodes, is64);
Start.moveToFirst();
MachORebaseEntry Finish(Opcodes, is64);
Finish.moveToEnd();
return iterator_range<rebase_iterator>(rebase_iterator(Start),
rebase_iterator(Finish));
}
iterator_range<rebase_iterator> MachOObjectFile::rebaseTable() const {
return rebaseTable(getDyldInfoRebaseOpcodes(), is64Bit());
}
MachOBindEntry::MachOBindEntry(ArrayRef<uint8_t> Bytes, bool is64Bit,
Kind BK)
: Opcodes(Bytes), Ptr(Bytes.begin()), SegmentOffset(0), SegmentIndex(0),
Ordinal(0), Flags(0), Addend(0), RemainingLoopCount(0), AdvanceAmount(0),
BindType(0), PointerSize(is64Bit ? 8 : 4),
TableKind(BK), Malformed(false), Done(false) {}
void MachOBindEntry::moveToFirst() {
Ptr = Opcodes.begin();
moveNext();
}
void MachOBindEntry::moveToEnd() {
Ptr = Opcodes.end();
RemainingLoopCount = 0;
Done = true;
}
void MachOBindEntry::moveNext() {
// If in the middle of some loop, move to next binding in loop.
SegmentOffset += AdvanceAmount;
if (RemainingLoopCount) {
--RemainingLoopCount;
return;
}
if (Ptr == Opcodes.end()) {
Done = true;
return;
}
bool More = true;
while (More && !Malformed) {
// Parse next opcode and set up next loop.
uint8_t Byte = *Ptr++;
uint8_t ImmValue = Byte & MachO::BIND_IMMEDIATE_MASK;
uint8_t Opcode = Byte & MachO::BIND_OPCODE_MASK;
int8_t SignExtended;
const uint8_t *SymStart;
switch (Opcode) {
case MachO::BIND_OPCODE_DONE:
if (TableKind == Kind::Lazy) {
// Lazying bindings have a DONE opcode between entries. Need to ignore
// it to advance to next entry. But need not if this is last entry.
bool NotLastEntry = false;
for (const uint8_t *P = Ptr; P < Opcodes.end(); ++P) {
if (*P) {
NotLastEntry = true;
}
}
if (NotLastEntry)
break;
}
More = false;
Done = true;
moveToEnd();
DEBUG_WITH_TYPE("mach-o-bind", llvm::dbgs() << "BIND_OPCODE_DONE\n");
break;
case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:
Ordinal = ImmValue;
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: "
<< "Ordinal=" << Ordinal << "\n");
break;
case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:
Ordinal = readULEB128();
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: "
<< "Ordinal=" << Ordinal << "\n");
break;
case MachO::BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:
if (ImmValue) {
SignExtended = MachO::BIND_OPCODE_MASK | ImmValue;
Ordinal = SignExtended;
} else
Ordinal = 0;
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: "
<< "Ordinal=" << Ordinal << "\n");
break;
case MachO::BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:
Flags = ImmValue;
SymStart = Ptr;
while (*Ptr) {
++Ptr;
}
SymbolName = StringRef(reinterpret_cast<const char*>(SymStart),
Ptr-SymStart);
++Ptr;
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: "
<< "SymbolName=" << SymbolName << "\n");
if (TableKind == Kind::Weak) {
if (ImmValue & MachO::BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION)
return;
}
break;
case MachO::BIND_OPCODE_SET_TYPE_IMM:
BindType = ImmValue;
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_SET_TYPE_IMM: "
<< "BindType=" << (int)BindType << "\n");
break;
case MachO::BIND_OPCODE_SET_ADDEND_SLEB:
Addend = readSLEB128();
if (TableKind == Kind::Lazy)
Malformed = true;
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_SET_ADDEND_SLEB: "
<< "Addend=" << Addend << "\n");
break;
case MachO::BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:
SegmentIndex = ImmValue;
SegmentOffset = readULEB128();
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: "
<< "SegmentIndex=" << SegmentIndex << ", "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< "\n");
break;
case MachO::BIND_OPCODE_ADD_ADDR_ULEB:
SegmentOffset += readULEB128();
DEBUG_WITH_TYPE("mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
break;
case MachO::BIND_OPCODE_DO_BIND:
AdvanceAmount = PointerSize;
RemainingLoopCount = 0;
DEBUG_WITH_TYPE("mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_DO_BIND: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
return;
case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:
AdvanceAmount = readULEB128() + PointerSize;
RemainingLoopCount = 0;
if (TableKind == Kind::Lazy)
Malformed = true;
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:
AdvanceAmount = ImmValue * PointerSize + PointerSize;
RemainingLoopCount = 0;
if (TableKind == Kind::Lazy)
Malformed = true;
DEBUG_WITH_TYPE("mach-o-bind",
llvm::dbgs()
<< "BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED: "
<< format("SegmentOffset=0x%06X",
SegmentOffset) << "\n");
return;
case MachO::BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:
RemainingLoopCount = readULEB128() - 1;
AdvanceAmount = readULEB128() + PointerSize;
if (TableKind == Kind::Lazy)
Malformed = true;
DEBUG_WITH_TYPE(
"mach-o-bind",
llvm::dbgs() << "BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB: "
<< format("SegmentOffset=0x%06X", SegmentOffset)
<< ", AdvanceAmount=" << AdvanceAmount
<< ", RemainingLoopCount=" << RemainingLoopCount
<< "\n");
return;
default:
Malformed = true;
}
}
}
uint64_t MachOBindEntry::readULEB128() {
unsigned Count;
uint64_t Result = decodeULEB128(Ptr, &Count);
Ptr += Count;
if (Ptr > Opcodes.end()) {
Ptr = Opcodes.end();
Malformed = true;
}
return Result;
}
int64_t MachOBindEntry::readSLEB128() {
unsigned Count;
int64_t Result = decodeSLEB128(Ptr, &Count);
Ptr += Count;
if (Ptr > Opcodes.end()) {
Ptr = Opcodes.end();
Malformed = true;
}
return Result;
}
uint32_t MachOBindEntry::segmentIndex() const { return SegmentIndex; }
uint64_t MachOBindEntry::segmentOffset() const { return SegmentOffset; }
StringRef MachOBindEntry::typeName() const {
switch (BindType) {
case MachO::BIND_TYPE_POINTER:
return "pointer";
case MachO::BIND_TYPE_TEXT_ABSOLUTE32:
return "text abs32";
case MachO::BIND_TYPE_TEXT_PCREL32:
return "text rel32";
}
return "unknown";
}
StringRef MachOBindEntry::symbolName() const { return SymbolName; }
int64_t MachOBindEntry::addend() const { return Addend; }
uint32_t MachOBindEntry::flags() const { return Flags; }
int MachOBindEntry::ordinal() const { return Ordinal; }
bool MachOBindEntry::operator==(const MachOBindEntry &Other) const {
assert(Opcodes == Other.Opcodes && "compare iterators of different files");
return (Ptr == Other.Ptr) &&
(RemainingLoopCount == Other.RemainingLoopCount) &&
(Done == Other.Done);
}
iterator_range<bind_iterator>
MachOObjectFile::bindTable(ArrayRef<uint8_t> Opcodes, bool is64,
MachOBindEntry::Kind BKind) {
MachOBindEntry Start(Opcodes, is64, BKind);
Start.moveToFirst();
MachOBindEntry Finish(Opcodes, is64, BKind);
Finish.moveToEnd();
return iterator_range<bind_iterator>(bind_iterator(Start),
bind_iterator(Finish));
}
iterator_range<bind_iterator> MachOObjectFile::bindTable() const {
return bindTable(getDyldInfoBindOpcodes(), is64Bit(),
MachOBindEntry::Kind::Regular);
}
iterator_range<bind_iterator> MachOObjectFile::lazyBindTable() const {
return bindTable(getDyldInfoLazyBindOpcodes(), is64Bit(),
MachOBindEntry::Kind::Lazy);
}
iterator_range<bind_iterator> MachOObjectFile::weakBindTable() const {
return bindTable(getDyldInfoWeakBindOpcodes(), is64Bit(),
MachOBindEntry::Kind::Weak);
}
MachOObjectFile::load_command_iterator
MachOObjectFile::begin_load_commands() const {
return LoadCommands.begin();
}
MachOObjectFile::load_command_iterator
MachOObjectFile::end_load_commands() const {
return LoadCommands.end();
}
iterator_range<MachOObjectFile::load_command_iterator>
MachOObjectFile::load_commands() const {
return iterator_range<load_command_iterator>(begin_load_commands(),
end_load_commands());
}
StringRef
MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const {
ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec);
return parseSegmentOrSectionName(Raw.data());
}
ArrayRef<char>
MachOObjectFile::getSectionRawName(DataRefImpl Sec) const {
assert(Sec.d.a < Sections.size() && "Should have detected this earlier");
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return makeArrayRef(Base->sectname);
}
ArrayRef<char>
MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const {
assert(Sec.d.a < Sections.size() && "Should have detected this earlier");
const section_base *Base =
reinterpret_cast<const section_base *>(Sections[Sec.d.a]);
return makeArrayRef(Base->segname);
}
bool
MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE)
const {
if (getCPUType(this) == MachO::CPU_TYPE_X86_64)
return false;
return getPlainRelocationAddress(RE) & MachO::R_SCATTERED;
}
unsigned MachOObjectFile::getPlainRelocationSymbolNum(
const MachO::any_relocation_info &RE) const {
if (isLittleEndian())
return RE.r_word1 & 0xffffff;
return RE.r_word1 >> 8;
}
bool MachOObjectFile::getPlainRelocationExternal(
const MachO::any_relocation_info &RE) const {
if (isLittleEndian())
return (RE.r_word1 >> 27) & 1;
return (RE.r_word1 >> 4) & 1;
}
bool MachOObjectFile::getScatteredRelocationScattered(
const MachO::any_relocation_info &RE) const {
return RE.r_word0 >> 31;
}
uint32_t MachOObjectFile::getScatteredRelocationValue(
const MachO::any_relocation_info &RE) const {
return RE.r_word1;
}
uint32_t MachOObjectFile::getScatteredRelocationType(
const MachO::any_relocation_info &RE) const {
return (RE.r_word0 >> 24) & 0xf;
}
unsigned MachOObjectFile::getAnyRelocationAddress(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationAddress(RE);
return getPlainRelocationAddress(RE);
}
unsigned MachOObjectFile::getAnyRelocationPCRel(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationPCRel(this, RE);
return getPlainRelocationPCRel(this, RE);
}
unsigned MachOObjectFile::getAnyRelocationLength(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationLength(RE);
return getPlainRelocationLength(this, RE);
}
unsigned
MachOObjectFile::getAnyRelocationType(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE))
return getScatteredRelocationType(RE);
return getPlainRelocationType(this, RE);
}
SectionRef
MachOObjectFile::getAnyRelocationSection(
const MachO::any_relocation_info &RE) const {
if (isRelocationScattered(RE) || getPlainRelocationExternal(RE))
return *section_end();
unsigned SecNum = getPlainRelocationSymbolNum(RE);
if (SecNum == MachO::R_ABS || SecNum > Sections.size())
return *section_end();
DataRefImpl DRI;
DRI.d.a = SecNum - 1;
return SectionRef(DRI, this);
}
MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const {
assert(DRI.d.a < Sections.size() && "Should have detected this earlier");
return getStruct<MachO::section>(this, Sections[DRI.d.a]);
}
MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const {
assert(DRI.d.a < Sections.size() && "Should have detected this earlier");
return getStruct<MachO::section_64>(this, Sections[DRI.d.a]);
}
MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L,
unsigned Index) const {
const char *Sec = getSectionPtr(this, L, Index);
return getStruct<MachO::section>(this, Sec);
}
MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L,
unsigned Index) const {
const char *Sec = getSectionPtr(this, L, Index);
return getStruct<MachO::section_64>(this, Sec);
}
MachO::nlist
MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist>(this, P);
}
MachO::nlist_64
MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const {
const char *P = reinterpret_cast<const char *>(DRI.p);
return getStruct<MachO::nlist_64>(this, P);
}
MachO::linkedit_data_command
MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::linkedit_data_command>(this, L.Ptr);
}
MachO::segment_command
MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::segment_command>(this, L.Ptr);
}
MachO::segment_command_64
MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::segment_command_64>(this, L.Ptr);
}
MachO::linker_option_command
MachOObjectFile::getLinkerOptionLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::linker_option_command>(this, L.Ptr);
}
MachO::version_min_command
MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::version_min_command>(this, L.Ptr);
}
MachO::dylib_command
MachOObjectFile::getDylibIDLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dylib_command>(this, L.Ptr);
}
MachO::dyld_info_command
MachOObjectFile::getDyldInfoLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dyld_info_command>(this, L.Ptr);
}
MachO::dylinker_command
MachOObjectFile::getDylinkerCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dylinker_command>(this, L.Ptr);
}
MachO::uuid_command
MachOObjectFile::getUuidCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::uuid_command>(this, L.Ptr);
}
MachO::rpath_command
MachOObjectFile::getRpathCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::rpath_command>(this, L.Ptr);
}
MachO::source_version_command
MachOObjectFile::getSourceVersionCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::source_version_command>(this, L.Ptr);
}
MachO::entry_point_command
MachOObjectFile::getEntryPointCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::entry_point_command>(this, L.Ptr);
}
MachO::encryption_info_command
MachOObjectFile::getEncryptionInfoCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::encryption_info_command>(this, L.Ptr);
}
MachO::encryption_info_command_64
MachOObjectFile::getEncryptionInfoCommand64(const LoadCommandInfo &L) const {
return getStruct<MachO::encryption_info_command_64>(this, L.Ptr);
}
MachO::sub_framework_command
MachOObjectFile::getSubFrameworkCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_framework_command>(this, L.Ptr);
}
MachO::sub_umbrella_command
MachOObjectFile::getSubUmbrellaCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_umbrella_command>(this, L.Ptr);
}
MachO::sub_library_command
MachOObjectFile::getSubLibraryCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_library_command>(this, L.Ptr);
}
MachO::sub_client_command
MachOObjectFile::getSubClientCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::sub_client_command>(this, L.Ptr);
}
MachO::routines_command
MachOObjectFile::getRoutinesCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::routines_command>(this, L.Ptr);
}
MachO::routines_command_64
MachOObjectFile::getRoutinesCommand64(const LoadCommandInfo &L) const {
return getStruct<MachO::routines_command_64>(this, L.Ptr);
}
MachO::thread_command
MachOObjectFile::getThreadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::thread_command>(this, L.Ptr);
}
MachO::any_relocation_info
MachOObjectFile::getRelocation(DataRefImpl Rel) const {
DataRefImpl Sec;
Sec.d.a = Rel.d.a;
uint32_t Offset;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
Offset = Sect.reloff;
} else {
MachO::section Sect = getSection(Sec);
Offset = Sect.reloff;
}
auto P = reinterpret_cast<const MachO::any_relocation_info *>(
getPtr(this, Offset)) + Rel.d.b;
return getStruct<MachO::any_relocation_info>(
this, reinterpret_cast<const char *>(P));
}
MachO::data_in_code_entry
MachOObjectFile::getDice(DataRefImpl Rel) const {
const char *P = reinterpret_cast<const char *>(Rel.p);
return getStruct<MachO::data_in_code_entry>(this, P);
}
const MachO::mach_header &MachOObjectFile::getHeader() const {
return Header;
}
const MachO::mach_header_64 &MachOObjectFile::getHeader64() const {
assert(is64Bit());
return Header64;
}
uint32_t MachOObjectFile::getIndirectSymbolTableEntry(
const MachO::dysymtab_command &DLC,
unsigned Index) const {
uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t);
return getStruct<uint32_t>(this, getPtr(this, Offset));
}
MachO::data_in_code_entry
MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset,
unsigned Index) const {
uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry);
return getStruct<MachO::data_in_code_entry>(this, getPtr(this, Offset));
}
MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const {
if (SymtabLoadCmd)
return getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
// If there is no SymtabLoadCmd return a load command with zero'ed fields.
MachO::symtab_command Cmd;
Cmd.cmd = MachO::LC_SYMTAB;
Cmd.cmdsize = sizeof(MachO::symtab_command);
Cmd.symoff = 0;
Cmd.nsyms = 0;
Cmd.stroff = 0;
Cmd.strsize = 0;
return Cmd;
}
MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const {
if (DysymtabLoadCmd)
return getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
// If there is no DysymtabLoadCmd return a load command with zero'ed fields.
MachO::dysymtab_command Cmd;
Cmd.cmd = MachO::LC_DYSYMTAB;
Cmd.cmdsize = sizeof(MachO::dysymtab_command);
Cmd.ilocalsym = 0;
Cmd.nlocalsym = 0;
Cmd.iextdefsym = 0;
Cmd.nextdefsym = 0;
Cmd.iundefsym = 0;
Cmd.nundefsym = 0;
Cmd.tocoff = 0;
Cmd.ntoc = 0;
Cmd.modtaboff = 0;
Cmd.nmodtab = 0;
Cmd.extrefsymoff = 0;
Cmd.nextrefsyms = 0;
Cmd.indirectsymoff = 0;
Cmd.nindirectsyms = 0;
Cmd.extreloff = 0;
Cmd.nextrel = 0;
Cmd.locreloff = 0;
Cmd.nlocrel = 0;
return Cmd;
}
MachO::linkedit_data_command
MachOObjectFile::getDataInCodeLoadCommand() const {
if (DataInCodeLoadCmd)
return getStruct<MachO::linkedit_data_command>(this, DataInCodeLoadCmd);
// If there is no DataInCodeLoadCmd return a load command with zero'ed fields.
MachO::linkedit_data_command Cmd;
Cmd.cmd = MachO::LC_DATA_IN_CODE;
Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
Cmd.dataoff = 0;
Cmd.datasize = 0;
return Cmd;
}
MachO::linkedit_data_command
MachOObjectFile::getLinkOptHintsLoadCommand() const {
if (LinkOptHintsLoadCmd)
return getStruct<MachO::linkedit_data_command>(this, LinkOptHintsLoadCmd);
// If there is no LinkOptHintsLoadCmd return a load command with zero'ed
// fields.
MachO::linkedit_data_command Cmd;
Cmd.cmd = MachO::LC_LINKER_OPTIMIZATION_HINT;
Cmd.cmdsize = sizeof(MachO::linkedit_data_command);
Cmd.dataoff = 0;
Cmd.datasize = 0;
return Cmd;
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoRebaseOpcodes() const {
if (!DyldInfoLoadCmd)
return ArrayRef<uint8_t>();
MachO::dyld_info_command DyldInfo
= getStruct<MachO::dyld_info_command>(this, DyldInfoLoadCmd);
const uint8_t *Ptr = reinterpret_cast<const uint8_t*>(
getPtr(this, DyldInfo.rebase_off));
return ArrayRef<uint8_t>(Ptr, DyldInfo.rebase_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoBindOpcodes() const {
if (!DyldInfoLoadCmd)
return ArrayRef<uint8_t>();
MachO::dyld_info_command DyldInfo
= getStruct<MachO::dyld_info_command>(this, DyldInfoLoadCmd);
const uint8_t *Ptr = reinterpret_cast<const uint8_t*>(
getPtr(this, DyldInfo.bind_off));
return ArrayRef<uint8_t>(Ptr, DyldInfo.bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoWeakBindOpcodes() const {
if (!DyldInfoLoadCmd)
return ArrayRef<uint8_t>();
MachO::dyld_info_command DyldInfo
= getStruct<MachO::dyld_info_command>(this, DyldInfoLoadCmd);
const uint8_t *Ptr = reinterpret_cast<const uint8_t*>(
getPtr(this, DyldInfo.weak_bind_off));
return ArrayRef<uint8_t>(Ptr, DyldInfo.weak_bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoLazyBindOpcodes() const {
if (!DyldInfoLoadCmd)
return ArrayRef<uint8_t>();
MachO::dyld_info_command DyldInfo
= getStruct<MachO::dyld_info_command>(this, DyldInfoLoadCmd);
const uint8_t *Ptr = reinterpret_cast<const uint8_t*>(
getPtr(this, DyldInfo.lazy_bind_off));
return ArrayRef<uint8_t>(Ptr, DyldInfo.lazy_bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoExportsTrie() const {
if (!DyldInfoLoadCmd)
return ArrayRef<uint8_t>();
MachO::dyld_info_command DyldInfo
= getStruct<MachO::dyld_info_command>(this, DyldInfoLoadCmd);
const uint8_t *Ptr = reinterpret_cast<const uint8_t*>(
getPtr(this, DyldInfo.export_off));
return ArrayRef<uint8_t>(Ptr, DyldInfo.export_size);
}
ArrayRef<uint8_t> MachOObjectFile::getUuid() const {
if (!UuidLoadCmd)
return ArrayRef<uint8_t>();
// Returning a pointer is fine as uuid doesn't need endian swapping.
const char *Ptr = UuidLoadCmd + offsetof(MachO::uuid_command, uuid);
return ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(Ptr), 16);
}
StringRef MachOObjectFile::getStringTableData() const {
MachO::symtab_command S = getSymtabLoadCommand();
return getData().substr(S.stroff, S.strsize);
}
bool MachOObjectFile::is64Bit() const {
return getType() == getMachOType(false, true) ||
getType() == getMachOType(true, true);
}
void MachOObjectFile::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);
}
}
bool MachOObjectFile::isRelocatableObject() const {
return getHeader().filetype == MachO::MH_OBJECT;
}
ErrorOr<std::unique_ptr<MachOObjectFile>>
ObjectFile::createMachOObjectFile(MemoryBufferRef Buffer) {
StringRef Magic = Buffer.getBuffer().slice(0, 4);
std::error_code EC;
std::unique_ptr<MachOObjectFile> Ret;
if (Magic == "\xFE\xED\xFA\xCE")
Ret.reset(new MachOObjectFile(Buffer, false, false, EC));
else if (Magic == "\xCE\xFA\xED\xFE")
Ret.reset(new MachOObjectFile(Buffer, true, false, EC));
else if (Magic == "\xFE\xED\xFA\xCF")
Ret.reset(new MachOObjectFile(Buffer, false, true, EC));
else if (Magic == "\xCF\xFA\xED\xFE")
Ret.reset(new MachOObjectFile(Buffer, true, true, EC));
else
return object_error::parse_failed;
if (EC)
return EC;
return std::move(Ret);
}
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