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llvm/lib/Object/MachOObjectFile.cpp
Kevin Enderby 63247519d7 Start to add real error messages for malformed Mach-O files. 
And update the existing test cases in test/Object/macho-invalid.test
to use llvm-objdump with the -macho option to produce these
error messages and stop producing the generic "Invalid data
was encountered while parsing the file" message.

Working from the beginning of the file, if the mach header is too large for
the size of the file and then if the load commands that follow extend past
the end of the file these two errors now generate correct error messages.

Both of these have existing test cases in test/Object/macho-invalid.test .

But the first with macho-invalid-header it will never trigger the error message
"mach header extends past the end of the file" using any of the llvm tools as
they all use identify_magic() which rejects files with the correct magic number
that are too small in size.  So I tested this by hacking that code and seeing the
error message down in parseHeader() really does happen.  So in case there
is ever code in llvm that directly calls createMachOObjectFile() this error
message will be correctly produced.

The second error message of "load commands extends past the end of the file"
is triggered by a number of existing tests cases in test/Object/macho-invalid.test .
Also other tests trigger different error messages now like "ilocalsym plus
nlocalsym in LC_DYSYMTAB load command extends past the end of the
symbol table".

There are two existing test cases that still get the "Invalid data was encountered ..."
error messages that I will tackle next.  But they will involve a bit of pluming an
Expect<...> up through the call stack and I want to do those as separate changes.

FYI, for those test cases that were trying to test specific errors that now get
different errors I’ll fix those in follow on changes and create new test cases
for those so they test the error they were meant to test.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266248 91177308-0d34-0410-b5e6-96231b3b80d8
2016-04-13 21:17:58 +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: Remove ECOverride once Error has been plumbed down to obj tool code.
static Error
malformedError(std::string FileName, std::string Msg,
object_error ECOverride = object_error::parse_failed) {
return make_error<GenericBinaryError>(std::move(FileName), std::move(Msg),
ECOverride);
}
// FIXME: Remove ECOverride once Error has been plumbed down to obj tool code.
static Error
malformedError(const MachOObjectFile &Obj, std::string Msg,
object_error ECOverride = object_error::parse_failed) {
return malformedError(Obj.getFileName(), std::move(Msg), ECOverride);
}
// 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 Expected<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 malformedError(*O, "Structure read out-of-range");
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 Expected<MachOObjectFile::LoadCommandInfo>
getLoadCommandInfo(const MachOObjectFile *Obj, const char *Ptr) {
if (auto CmdOrErr = getStructOrErr<MachO::load_command>(Obj, Ptr)) {
if (CmdOrErr->cmdsize < 8)
return malformedError(*Obj, "Mach-O load command with size < 8 bytes",
object_error::macho_small_load_command);
return MachOObjectFile::LoadCommandInfo({Ptr, *CmdOrErr});
} else
return CmdOrErr.takeError();
}
static Expected<MachOObjectFile::LoadCommandInfo>
getFirstLoadCommandInfo(const MachOObjectFile *Obj) {
unsigned HeaderSize = Obj->is64Bit() ? sizeof(MachO::mach_header_64)
: sizeof(MachO::mach_header);
if (sizeof(MachOObjectFile::LoadCommandInfo) > Obj->getHeader().sizeofcmds)
return malformedError(*Obj, "truncated or malformed object (load command "
"0 extends past the end all load commands in the "
"file)");
return getLoadCommandInfo(Obj, getPtr(Obj, HeaderSize));
}
static Expected<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,
Error &Err) {
if (sizeof(T) > Obj->getData().size()) {
Err = malformedError(*Obj, "truncated or malformed object (the mach header "
"extends past the end of the file)");
return;
}
if (auto HeaderOrErr = getStructOrErr<T>(Obj, getPtr(Obj, 0)))
Header = *HeaderOrErr;
else
Err = HeaderOrErr.takeError();
}
// 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 Error 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 malformedError(*Obj,
"Mach-O segment load command size is too small",
object_error::macho_load_segment_too_small);
if (auto SegOrErr = getStructOrErr<SegmentCmd>(Obj, Load.Ptr)) {
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 malformedError(*Obj,
"Mach-O segment load command contains too many "
"sections",
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);
} else
return SegOrErr.takeError();
return Error::success();
}
Expected<std::unique_ptr<MachOObjectFile>>
MachOObjectFile::create(MemoryBufferRef Object, bool IsLittleEndian,
bool Is64Bits) {
Error Err;
std::unique_ptr<MachOObjectFile> Obj(
new MachOObjectFile(std::move(Object), IsLittleEndian,
Is64Bits, Err));
if (Err)
return std::move(Err);
return std::move(Obj);
}
MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
bool Is64bits, Error &Err)
: ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object),
SymtabLoadCmd(nullptr), DysymtabLoadCmd(nullptr),
DataInCodeLoadCmd(nullptr), LinkOptHintsLoadCmd(nullptr),
DyldInfoLoadCmd(nullptr), UuidLoadCmd(nullptr),
HasPageZeroSegment(false) {
ErrorAsOutParameter ErrAsOutParam(Err);
uint64_t big_size;
if (is64Bit()) {
parseHeader(this, Header64, Err);
big_size = sizeof(MachO::mach_header_64);
} else {
parseHeader(this, Header, Err);
big_size = sizeof(MachO::mach_header);
}
if (Err)
return;
big_size += getHeader().sizeofcmds;
if (getData().data() + big_size > getData().end()) {
Err = malformedError(getFileName(), "truncated or malformed object "
"(load commands extends past the end of the file)");
return;
}
uint32_t LoadCommandCount = getHeader().ncmds;
if (LoadCommandCount == 0)
return;
LoadCommandInfo Load;
if (auto LoadOrErr = getFirstLoadCommandInfo(this))
Load = *LoadOrErr;
else {
Err = LoadOrErr.takeError();
return;
}
for (unsigned I = 0; I < LoadCommandCount; ++I) {
LoadCommands.push_back(Load);
if (Load.C.cmd == MachO::LC_SYMTAB) {
// Multiple symbol tables
if (SymtabLoadCmd) {
Err = malformedError(*this, "Multiple symbol tables");
return;
}
SymtabLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DYSYMTAB) {
// Multiple dynamic symbol tables
if (DysymtabLoadCmd) {
Err = malformedError(*this, "Multiple dynamic symbol tables");
return;
}
DysymtabLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) {
// Multiple data in code tables
if (DataInCodeLoadCmd) {
Err = malformedError(*this, "Multiple data-in-code tables");
return;
}
DataInCodeLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_LINKER_OPTIMIZATION_HINT) {
// Multiple linker optimization hint tables
if (LinkOptHintsLoadCmd) {
Err = malformedError(*this, "Multiple linker optimization hint tables");
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) {
Err = malformedError(*this, "Multiple dyldinfo load commands");
return;
}
DyldInfoLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_UUID) {
// Multiple UUID load commands
if (UuidLoadCmd) {
Err = malformedError(*this, "Multiple UUID load commands");
return;
}
UuidLoadCmd = Load.Ptr;
} else if (Load.C.cmd == MachO::LC_SEGMENT_64) {
if ((Err = parseSegmentLoadCommand<MachO::segment_command_64>(
this, Load, Sections, HasPageZeroSegment)))
return;
} else if (Load.C.cmd == MachO::LC_SEGMENT) {
if ((Err = 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) {
if (auto LoadOrErr = getNextLoadCommandInfo(this, Load))
Load = *LoadOrErr;
else {
Err = LoadOrErr.takeError();
return;
}
}
}
if (!SymtabLoadCmd) {
if (DysymtabLoadCmd) {
Err = malformedError(*this,
"truncated or malformed object (contains "
"LC_DYSYMTAB load command without a LC_SYMTAB load "
"command)");
return;
}
} else if (DysymtabLoadCmd) {
MachO::symtab_command Symtab =
getStruct<MachO::symtab_command>(this, SymtabLoadCmd);
MachO::dysymtab_command Dysymtab =
getStruct<MachO::dysymtab_command>(this, DysymtabLoadCmd);
if (Dysymtab.nlocalsym != 0 && Dysymtab.ilocalsym > Symtab.nsyms) {
Err = malformedError(*this,
"truncated or malformed object (iolocalsym in "
"LC_DYSYMTAB load command extends past the end of "
"the symbol table)");
return;
}
uint64_t big_size = Dysymtab.ilocalsym;
big_size += Dysymtab.nlocalsym;
if (Dysymtab.nlocalsym != 0 && big_size > Symtab.nsyms) {
Err = malformedError(*this,
"truncated or malformed object (ilocalsym plus "
"nlocalsym in LC_DYSYMTAB load command extends past "
"the end of the symbol table)");
return;
}
if (Dysymtab.nextdefsym != 0 && Dysymtab.ilocalsym > Symtab.nsyms) {
Err = malformedError(*this,
"truncated or malformed object (nextdefsym in "
"LC_DYSYMTAB load command extends past the end of "
"the symbol table)");
return;
}
big_size = Dysymtab.iextdefsym;
big_size += Dysymtab.nextdefsym;
if (Dysymtab.nextdefsym != 0 && big_size > Symtab.nsyms) {
Err = malformedError(*this,
"truncated or malformed object (iextdefsym plus "
"nextdefsym in LC_DYSYMTAB load command extends "
"past the end of the symbol table)");
return;
}
if (Dysymtab.nundefsym != 0 && Dysymtab.iundefsym > Symtab.nsyms) {
Err = malformedError(*this,
"truncated or malformed object (nundefsym in "
"LC_DYSYMTAB load command extends past the end of "
"the symbol table)");
return;
}
big_size = Dysymtab.iundefsym;
big_size += Dysymtab.nundefsym;
if (Dysymtab.nundefsym != 0 && big_size > Symtab.nsyms) {
Err = malformedError(*this,
"truncated or malformed object (iundefsym plus "
"nundefsym in LC_DYSYMTAB load command extends past "
"the end of the symbol table");
return;
}
}
assert(LoadCommands.size() == LoadCommandCount);
Err = Error::success();
}
void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
unsigned SymbolTableEntrySize = is64Bit() ?
sizeof(MachO::nlist_64) :
sizeof(MachO::nlist);
Symb.p += SymbolTableEntrySize;
}
ErrorOr<StringRef> MachOObjectFile::getSymbolName(DataRefImpl Symb) 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())
return object_error::parse_failed;
return StringRef(Start);
}
unsigned MachOObjectFile::getSectionType(SectionRef Sec) const {
DataRefImpl DRI = Sec.getRawDataRefImpl();
uint32_t Flags = getSectionFlags(this, DRI);
return Flags & MachO::SECTION_TYPE;
}
uint64_t MachOObjectFile::getNValue(DataRefImpl Sym) const {
if (is64Bit()) {
MachO::nlist_64 Entry = getSymbol64TableEntry(Sym);
return Entry.n_value;
}
MachO::nlist Entry = getSymbolTableEntry(Sym);
return Entry.n_value;
}
// 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();
MachO::nlist_base Entry = getSymbolTableEntryBase(this, Symb);
if ((Entry.n_type & MachO::N_TYPE) != MachO::N_INDR)
return object_error::parse_failed;
uint64_t NValue = getNValue(Symb);
if (NValue >= StringTable.size())
return object_error::parse_failed;
const char *Start = &StringTable.data()[NValue];
Res = StringRef(Start);
return std::error_code();
}
uint64_t MachOObjectFile::getSymbolValueImpl(DataRefImpl Sym) const {
return getNValue(Sym);
}
ErrorOr<uint64_t> MachOObjectFile::getSymbolAddress(DataRefImpl Sym) const {
return getSymbolValue(Sym);
}
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 {
return getNValue(DRI);
}
ErrorOr<SymbolRef::Type>
MachOObjectFile::getSymbolType(DataRefImpl Symb) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(this, Symb);
uint8_t n_type = Entry.n_type;
// If this is a STAB debugging symbol, we can do nothing more.
if (n_type & MachO::N_STAB)
return SymbolRef::ST_Debug;
switch (n_type & MachO::N_TYPE) {
case MachO::N_UNDF :
return SymbolRef::ST_Unknown;
case MachO::N_SECT :
ErrorOr<section_iterator> SecOrError = getSymbolSection(Symb);
if (!SecOrError)
return SecOrError.getError();
section_iterator Sec = *SecOrError;
if (Sec->isData() || Sec->isBSS())
return SymbolRef::ST_Data;
return SymbolRef::ST_Function;
}
return SymbolRef::ST_Other;
}
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_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) {
if (getNValue(DRI))
Result |= SymbolRef::SF_Common;
else
Result |= SymbolRef::SF_Undefined;
}
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;
}
ErrorOr<section_iterator>
MachOObjectFile::getSymbolSection(DataRefImpl Symb) const {
MachO::nlist_base Entry = getSymbolTableEntryBase(this, Symb);
uint8_t index = Entry.n_sect;
if (index == 0)
return section_end();
DataRefImpl DRI;
DRI.d.a = index - 1;
if (DRI.d.a >= Sections.size()){
// Diagnostic("bad section index (" + index + ") for symbol at index " +
// SymbolIndex);
return object_error::parse_failed;
}
return section_iterator(SectionRef(DRI, this));
}
unsigned MachOObjectFile::getSymbolSectionID(SymbolRef Sym) const {
MachO::nlist_base Entry =
getSymbolTableEntryBase(this, Sym.getRawDataRefImpl());
return Entry.n_sect - 1;
}
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 {
// In the case if a malformed Mach-O file where the section offset is past
// the end of the file or some part of the section size is past the end of
// the file return a size of zero or a size that covers the rest of the file
// but does not extend past the end of the file.
uint32_t SectOffset, SectType;
uint64_t SectSize;
if (is64Bit()) {
MachO::section_64 Sect = getSection64(Sec);
SectOffset = Sect.offset;
SectSize = Sect.size;
SectType = Sect.flags & MachO::SECTION_TYPE;
} else {
MachO::section Sect = getSection(Sec);
SectOffset = Sect.offset;
SectSize = Sect.size;
SectType = Sect.flags & MachO::SECTION_TYPE;
}
if (SectType == MachO::S_ZEROFILL || SectType == MachO::S_GB_ZEROFILL)
return SectSize;
uint64_t FileSize = getData().size();
if (SectOffset > FileSize)
return 0;
if (FileSize - SectOffset < SectSize)
return FileSize - SectOffset;
return SectSize;
}
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);
}
unsigned MachOObjectFile::getSectionID(SectionRef Sec) const {
return Sec.getRawDataRefImpl().d.a;
}
bool MachOObjectFile::isSectionVirtual(DataRefImpl Sec) const {
// FIXME: Unimplemented.
return false;
}
bool MachOObjectFile::isSectionBitcode(DataRefImpl Sec) const {
StringRef SegmentName = getSectionFinalSegmentName(Sec);
StringRef SectName;
if (!getSectionName(Sec, SectName))
return (SegmentName == "__LLVM" && SectName == "__bitcode");
return false;
}
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;
}
uint64_t MachOObjectFile::getRelocationOffset(DataRefImpl Rel) const {
assert(getHeader().filetype == MachO::MH_OBJECT &&
"Only implemented for MH_OBJECT");
MachO::any_relocation_info RE = getRelocation(Rel);
return getAnyRelocationAddress(RE);
}
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)));
}
uint64_t MachOObjectFile::getRelocationType(DataRefImpl Rel) const {
MachO::any_relocation_info RE = getRelocation(Rel);
return getAnyRelocationType(RE);
}
void MachOObjectFile::getRelocationTypeName(
DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
StringRef res;
uint64_t RType = getRelocationType(Rel);
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());
}
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();
}
section_iterator
MachOObjectFile::getRelocationRelocatedSection(relocation_iterator Rel) const {
DataRefImpl Sec;
Sec.d.a = Rel->getRawDataRefImpl().d.a;
return section_iterator(SectionRef(Sec, this));
}
basic_symbol_iterator MachOObjectFile::symbol_begin_impl() const {
DataRefImpl DRI;
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (!SymtabLoadCmd || Symtab.nsyms == 0)
return basic_symbol_iterator(SymbolRef(DRI, this));
return getSymbolByIndex(0);
}
basic_symbol_iterator MachOObjectFile::symbol_end_impl() const {
DataRefImpl DRI;
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (!SymtabLoadCmd || Symtab.nsyms == 0)
return basic_symbol_iterator(SymbolRef(DRI, this));
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 {
MachO::symtab_command Symtab = getSymtabLoadCommand();
if (!SymtabLoadCmd || Index >= Symtab.nsyms)
report_fatal_error("Requested symbol index is out of range.");
unsigned SymbolTableEntrySize =
is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
DataRefImpl DRI;
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 make_range(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 make_range(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 make_range(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 make_range(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 None;
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 makeArrayRef(Ptr, DyldInfo.rebase_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoBindOpcodes() const {
if (!DyldInfoLoadCmd)
return None;
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 makeArrayRef(Ptr, DyldInfo.bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoWeakBindOpcodes() const {
if (!DyldInfoLoadCmd)
return None;
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 makeArrayRef(Ptr, DyldInfo.weak_bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoLazyBindOpcodes() const {
if (!DyldInfoLoadCmd)
return None;
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 makeArrayRef(Ptr, DyldInfo.lazy_bind_size);
}
ArrayRef<uint8_t> MachOObjectFile::getDyldInfoExportsTrie() const {
if (!DyldInfoLoadCmd)
return None;
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 makeArrayRef(Ptr, DyldInfo.export_size);
}
ArrayRef<uint8_t> MachOObjectFile::getUuid() const {
if (!UuidLoadCmd)
return None;
// Returning a pointer is fine as uuid doesn't need endian swapping.
const char *Ptr = UuidLoadCmd + offsetof(MachO::uuid_command, uuid);
return makeArrayRef(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;
}
Expected<std::unique_ptr<MachOObjectFile>>
ObjectFile::createMachOObjectFile(MemoryBufferRef Buffer) {
StringRef Magic = Buffer.getBuffer().slice(0, 4);
if (Magic == "\xFE\xED\xFA\xCE")
return MachOObjectFile::create(Buffer, false, false);
if (Magic == "\xCE\xFA\xED\xFE")
return MachOObjectFile::create(Buffer, true, false);
if (Magic == "\xFE\xED\xFA\xCF")
return MachOObjectFile::create(Buffer, false, true);
if (Magic == "\xCF\xFA\xED\xFE")
return MachOObjectFile::create(Buffer, true, true);
return malformedError(Buffer.getBufferIdentifier(),
"Unrecognized MachO magic number");
}
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