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0d50598d71
Once the objects are constructed, they own the buffer. Passing a unique_ptr makes that clear. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211595 91177308-0d34-0410-b5e6-96231b3b80d8
156 lines
5.1 KiB
C++
156 lines
5.1 KiB
C++
//===- MachOUniversal.cpp - Mach-O universal binary -------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MachOUniversalBinary class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/MachOUniversal.h"
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#include "llvm/Object/MachO.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Object/Archive.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/MemoryBuffer.h"
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using namespace llvm;
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using namespace object;
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template<typename T>
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static void SwapStruct(T &Value);
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template<>
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void SwapStruct(MachO::fat_header &H) {
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sys::swapByteOrder(H.magic);
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sys::swapByteOrder(H.nfat_arch);
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}
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template<>
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void SwapStruct(MachO::fat_arch &H) {
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sys::swapByteOrder(H.cputype);
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sys::swapByteOrder(H.cpusubtype);
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sys::swapByteOrder(H.offset);
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sys::swapByteOrder(H.size);
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sys::swapByteOrder(H.align);
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}
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template<typename T>
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static T getUniversalBinaryStruct(const char *Ptr) {
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T Res;
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memcpy(&Res, Ptr, sizeof(T));
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// Universal binary headers have big-endian byte order.
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if (sys::IsLittleEndianHost)
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SwapStruct(Res);
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return Res;
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}
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MachOUniversalBinary::ObjectForArch::ObjectForArch(
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const MachOUniversalBinary *Parent, uint32_t Index)
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: Parent(Parent), Index(Index) {
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if (!Parent || Index >= Parent->getNumberOfObjects()) {
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clear();
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} else {
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// Parse object header.
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StringRef ParentData = Parent->getData();
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const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
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Index * sizeof(MachO::fat_arch);
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Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
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if (ParentData.size() < Header.offset + Header.size) {
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clear();
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}
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}
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}
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ErrorOr<std::unique_ptr<ObjectFile>>
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MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
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if (Parent) {
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StringRef ParentData = Parent->getData();
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StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
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std::string ObjectName = Parent->getFileName().str();
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std::unique_ptr<MemoryBuffer> ObjBuffer(
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MemoryBuffer::getMemBuffer(ObjectData, ObjectName, false));
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return ObjectFile::createMachOObjectFile(ObjBuffer);
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}
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return object_error::parse_failed;
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}
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std::error_code MachOUniversalBinary::ObjectForArch::getAsArchive(
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std::unique_ptr<Archive> &Result) const {
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if (Parent) {
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StringRef ParentData = Parent->getData();
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StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
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std::string ObjectName = Parent->getFileName().str();
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std::unique_ptr<MemoryBuffer> ObjBuffer(
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MemoryBuffer::getMemBuffer(ObjectData, ObjectName, false));
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ErrorOr<Archive *> Obj = Archive::create(std::move(ObjBuffer));
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if (std::error_code EC = Obj.getError())
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return EC;
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Result.reset(Obj.get());
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return object_error::success;
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}
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return object_error::parse_failed;
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}
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void MachOUniversalBinary::anchor() { }
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ErrorOr<MachOUniversalBinary *>
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MachOUniversalBinary::create(std::unique_ptr<MemoryBuffer> Source) {
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std::error_code EC;
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std::unique_ptr<MachOUniversalBinary> Ret(
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new MachOUniversalBinary(std::move(Source), EC));
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if (EC)
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return EC;
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return Ret.release();
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}
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MachOUniversalBinary::MachOUniversalBinary(std::unique_ptr<MemoryBuffer> Source,
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std::error_code &ec)
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: Binary(Binary::ID_MachOUniversalBinary, std::move(Source)),
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NumberOfObjects(0) {
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if (Data->getBufferSize() < sizeof(MachO::fat_header)) {
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ec = object_error::invalid_file_type;
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return;
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}
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// Check for magic value and sufficient header size.
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StringRef Buf = getData();
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MachO::fat_header H= getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
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NumberOfObjects = H.nfat_arch;
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uint32_t MinSize = sizeof(MachO::fat_header) +
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sizeof(MachO::fat_arch) * NumberOfObjects;
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if (H.magic != MachO::FAT_MAGIC || Buf.size() < MinSize) {
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ec = object_error::parse_failed;
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return;
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}
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ec = object_error::success;
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}
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static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
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switch (Arch) {
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case Triple::x86: CTM = MachO::CPU_TYPE_I386; return true;
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case Triple::x86_64: CTM = MachO::CPU_TYPE_X86_64; return true;
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case Triple::arm: CTM = MachO::CPU_TYPE_ARM; return true;
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case Triple::sparc: CTM = MachO::CPU_TYPE_SPARC; return true;
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case Triple::ppc: CTM = MachO::CPU_TYPE_POWERPC; return true;
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case Triple::ppc64: CTM = MachO::CPU_TYPE_POWERPC64; return true;
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default: return false;
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}
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}
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ErrorOr<std::unique_ptr<ObjectFile>>
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MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch) const {
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MachO::CPUType CTM;
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if (!getCTMForArch(Arch, CTM))
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return object_error::arch_not_found;
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for (object_iterator I = begin_objects(), E = end_objects(); I != E; ++I) {
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if (I->getCPUType() == static_cast<uint32_t>(CTM))
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return I->getAsObjectFile();
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}
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return object_error::arch_not_found;
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}
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