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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189728 91177308-0d34-0410-b5e6-96231b3b80d8
140 lines
4.4 KiB
C++
140 lines
4.4 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/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 SwapValue(T &Value) {
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Value = sys::SwapByteOrder(Value);
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}
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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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SwapValue(H.magic);
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SwapValue(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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SwapValue(H.cputype);
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SwapValue(H.cpusubtype);
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SwapValue(H.offset);
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SwapValue(H.size);
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SwapValue(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 == 0 || 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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error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
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OwningPtr<ObjectFile> &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 =
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Parent->getFileName().str() + ":" +
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Triple::getArchTypeName(MachOObjectFile::getArch(Header.cputype));
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MemoryBuffer *ObjBuffer = MemoryBuffer::getMemBuffer(
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ObjectData, ObjectName, false);
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if (ObjectFile *Obj = ObjectFile::createMachOObjectFile(ObjBuffer)) {
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Result.reset(Obj);
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return object_error::success;
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}
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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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MachOUniversalBinary::MachOUniversalBinary(MemoryBuffer *Source,
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error_code &ec)
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: Binary(Binary::ID_MachOUniversalBinary, Source),
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NumberOfObjects(0) {
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if (Source->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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error_code
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MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
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OwningPtr<ObjectFile> &Result) 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(Result);
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}
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return object_error::arch_not_found;
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}
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