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//===- MachOUniversal.cpp - Mach-O universal binary -------------*- 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 MachOUniversalBinary class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
using namespace object;
static Error
malformedError(Twine Msg) {
std::string StringMsg = "truncated or malformed fat file (" + Msg.str() + ")";
return make_error<GenericBinaryError>(std::move(StringMsg),
object_error::parse_failed);
}
template<typename T>
static T getUniversalBinaryStruct(const char *Ptr) {
T Res;
memcpy(&Res, Ptr, sizeof(T));
// Universal binary headers have big-endian byte order.
if (sys::IsLittleEndianHost)
swapStruct(Res);
return Res;
}
MachOUniversalBinary::ObjectForArch::ObjectForArch(
const MachOUniversalBinary *Parent, uint32_t Index)
: Parent(Parent), Index(Index) {
// The iterators use Parent as a nullptr and an Index+1 == NumberOfObjects.
if (!Parent || Index >= Parent->getNumberOfObjects()) {
clear();
} else {
// Parse object header.
StringRef ParentData = Parent->getData();
if (Parent->getMagic() == MachO::FAT_MAGIC) {
const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
Index * sizeof(MachO::fat_arch);
Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
} else { // Parent->getMagic() == MachO::FAT_MAGIC_64
const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
Index * sizeof(MachO::fat_arch_64);
Header64 = getUniversalBinaryStruct<MachO::fat_arch_64>(HeaderPos);
}
}
}
Expected<std::unique_ptr<MachOObjectFile>>
MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
if (!Parent)
report_fatal_error("MachOUniversalBinary::ObjectForArch::getAsObjectFile() "
"called when Parent is a nullptr");
StringRef ParentData = Parent->getData();
StringRef ObjectData;
uint32_t cputype;
if (Parent->getMagic() == MachO::FAT_MAGIC) {
ObjectData = ParentData.substr(Header.offset, Header.size);
cputype = Header.cputype;
} else { // Parent->getMagic() == MachO::FAT_MAGIC_64
ObjectData = ParentData.substr(Header64.offset, Header64.size);
cputype = Header64.cputype;
}
StringRef ObjectName = Parent->getFileName();
MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
return ObjectFile::createMachOObjectFile(ObjBuffer, cputype, Index);
}
Expected<std::unique_ptr<Archive>>
MachOUniversalBinary::ObjectForArch::getAsArchive() const {
if (!Parent)
report_fatal_error("MachOUniversalBinary::ObjectForArch::getAsArchive() "
"called when Parent is a nullptr");
StringRef ParentData = Parent->getData();
StringRef ObjectData;
if (Parent->getMagic() == MachO::FAT_MAGIC)
ObjectData = ParentData.substr(Header.offset, Header.size);
else // Parent->getMagic() == MachO::FAT_MAGIC_64
ObjectData = ParentData.substr(Header64.offset, Header64.size);
StringRef ObjectName = Parent->getFileName();
MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
return Archive::create(ObjBuffer);
}
void MachOUniversalBinary::anchor() { }
Expected<std::unique_ptr<MachOUniversalBinary>>
MachOUniversalBinary::create(MemoryBufferRef Source) {
Error Err = Error::success();
std::unique_ptr<MachOUniversalBinary> Ret(
new MachOUniversalBinary(Source, Err));
if (Err)
return std::move(Err);
return std::move(Ret);
}
MachOUniversalBinary::MachOUniversalBinary(MemoryBufferRef Source, Error &Err)
: Binary(Binary::ID_MachOUniversalBinary, Source), Magic(0),
NumberOfObjects(0) {
ErrorAsOutParameter ErrAsOutParam(&Err);
if (Data.getBufferSize() < sizeof(MachO::fat_header)) {
Err = make_error<GenericBinaryError>("File too small to be a Mach-O "
"universal file",
object_error::invalid_file_type);
return;
}
// Check for magic value and sufficient header size.
StringRef Buf = getData();
MachO::fat_header H =
getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
Magic = H.magic;
NumberOfObjects = H.nfat_arch;
if (NumberOfObjects == 0) {
Err = malformedError("contains zero architecture types");
return;
}
uint32_t MinSize = sizeof(MachO::fat_header);
if (Magic == MachO::FAT_MAGIC)
MinSize += sizeof(MachO::fat_arch) * NumberOfObjects;
else if (Magic == MachO::FAT_MAGIC_64)
MinSize += sizeof(MachO::fat_arch_64) * NumberOfObjects;
else {
Err = malformedError("bad magic number");
return;
}
if (Buf.size() < MinSize) {
Err = malformedError("fat_arch" +
Twine(Magic == MachO::FAT_MAGIC ? "" : "_64") +
" structs would extend past the end of the file");
return;
}
for (uint32_t i = 0; i < NumberOfObjects; i++) {
ObjectForArch A(this, i);
uint64_t bigSize = A.getOffset();
bigSize += A.getSize();
if (bigSize > Buf.size()) {
Err = malformedError("offset plus size of cputype (" +
Twine(A.getCPUType()) + ") cpusubtype (" +
Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
") extends past the end of the file");
return;
}
#define MAXSECTALIGN 15 /* 2**15 or 0x8000 */
if (A.getAlign() > MAXSECTALIGN) {
Err = malformedError("align (2^" + Twine(A.getAlign()) + ") too large "
"for cputype (" + Twine(A.getCPUType()) + ") cpusubtype (" +
Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
") (maximum 2^" + Twine(MAXSECTALIGN) + ")");
return;
}
if(A.getOffset() % (1 << A.getAlign()) != 0){
Err = malformedError("offset: " + Twine(A.getOffset()) +
" for cputype (" + Twine(A.getCPUType()) + ") cpusubtype (" +
Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
") not aligned on it's alignment (2^" + Twine(A.getAlign()) + ")");
return;
}
if (A.getOffset() < MinSize) {
Err = malformedError("cputype (" + Twine(A.getCPUType()) + ") "
"cpusubtype (" + Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
") offset " + Twine(A.getOffset()) + " overlaps universal headers");
return;
}
}
for (uint32_t i = 0; i < NumberOfObjects; i++) {
ObjectForArch A(this, i);
for (uint32_t j = i + 1; j < NumberOfObjects; j++) {
ObjectForArch B(this, j);
if (A.getCPUType() == B.getCPUType() &&
(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) ==
(B.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK)) {
Err = malformedError("contains two of the same architecture (cputype "
"(" + Twine(A.getCPUType()) + ") cpusubtype (" +
Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) + "))");
return;
}
if ((A.getOffset() >= B.getOffset() &&
A.getOffset() < B.getOffset() + B.getSize()) ||
(A.getOffset() + A.getSize() > B.getOffset() &&
A.getOffset() + A.getSize() < B.getOffset() + B.getSize()) ||
(A.getOffset() <= B.getOffset() &&
A.getOffset() + A.getSize() >= B.getOffset() + B.getSize())) {
Err = malformedError("cputype (" + Twine(A.getCPUType()) + ") "
"cpusubtype (" + Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
") at offset " + Twine(A.getOffset()) + " with a size of " +
Twine(A.getSize()) + ", overlaps cputype (" + Twine(B.getCPUType()) +
") cpusubtype (" + Twine(B.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK)
+ ") at offset " + Twine(B.getOffset()) + " with a size of "
+ Twine(B.getSize()));
return;
}
}
}
Err = Error::success();
}
Expected<std::unique_ptr<MachOObjectFile>>
MachOUniversalBinary::getObjectForArch(StringRef ArchName) const {
if (Triple(ArchName).getArch() == Triple::ArchType::UnknownArch)
return make_error<GenericBinaryError>("Unknown architecture "
"named: " +
ArchName,
object_error::arch_not_found);
for (auto &Obj : objects())
if (Obj.getArchFlagName() == ArchName)
return Obj.getAsObjectFile();
return make_error<GenericBinaryError>("fat file does not "
"contain " +
ArchName,
object_error::arch_not_found);
}
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