forked from OSchip/llvm-project
546 lines
19 KiB
C++
546 lines
19 KiB
C++
//===-- MachOUtils.cpp - Mach-o specific helpers for dsymutil ------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "MachOUtils.h"
|
|
#include "BinaryHolder.h"
|
|
#include "DebugMap.h"
|
|
#include "LinkUtils.h"
|
|
#include "NonRelocatableStringpool.h"
|
|
#include "llvm/MC/MCAsmLayout.h"
|
|
#include "llvm/MC/MCMachObjectWriter.h"
|
|
#include "llvm/MC/MCObjectStreamer.h"
|
|
#include "llvm/MC/MCSectionMachO.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/Object/MachO.h"
|
|
#include "llvm/Support/FileUtilities.h"
|
|
#include "llvm/Support/Program.h"
|
|
#include "llvm/Support/WithColor.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
namespace llvm {
|
|
namespace dsymutil {
|
|
namespace MachOUtils {
|
|
|
|
llvm::Error ArchAndFile::createTempFile() {
|
|
llvm::SmallString<128> TmpModel;
|
|
llvm::sys::path::system_temp_directory(true, TmpModel);
|
|
llvm::sys::path::append(TmpModel, "dsym.tmp%%%%%.dwarf");
|
|
Expected<sys::fs::TempFile> T = sys::fs::TempFile::create(TmpModel);
|
|
|
|
if (!T)
|
|
return T.takeError();
|
|
|
|
File = llvm::Optional<sys::fs::TempFile>(std::move(*T));
|
|
return Error::success();
|
|
}
|
|
|
|
llvm::StringRef ArchAndFile::path() const { return File->TmpName; }
|
|
|
|
ArchAndFile::~ArchAndFile() {
|
|
if (File)
|
|
if (auto E = File->discard())
|
|
llvm::consumeError(std::move(E));
|
|
}
|
|
|
|
std::string getArchName(StringRef Arch) {
|
|
if (Arch.startswith("thumb"))
|
|
return (llvm::Twine("arm") + Arch.drop_front(5)).str();
|
|
return Arch;
|
|
}
|
|
|
|
static bool runLipo(StringRef SDKPath, SmallVectorImpl<StringRef> &Args) {
|
|
auto Path = sys::findProgramByName("lipo", makeArrayRef(SDKPath));
|
|
if (!Path)
|
|
Path = sys::findProgramByName("lipo");
|
|
|
|
if (!Path) {
|
|
WithColor::error() << "lipo: " << Path.getError().message() << "\n";
|
|
return false;
|
|
}
|
|
|
|
std::string ErrMsg;
|
|
int result = sys::ExecuteAndWait(*Path, Args, None, {}, 0, 0, &ErrMsg);
|
|
if (result) {
|
|
WithColor::error() << "lipo: " << ErrMsg << "\n";
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool generateUniversalBinary(SmallVectorImpl<ArchAndFile> &ArchFiles,
|
|
StringRef OutputFileName,
|
|
const LinkOptions &Options, StringRef SDKPath) {
|
|
// No need to merge one file into a universal fat binary.
|
|
if (ArchFiles.size() == 1) {
|
|
if (auto E = ArchFiles.front().File->keep(OutputFileName)) {
|
|
WithColor::error() << "while keeping " << ArchFiles.front().path()
|
|
<< " as " << OutputFileName << ": "
|
|
<< toString(std::move(E)) << "\n";
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
SmallVector<StringRef, 8> Args;
|
|
Args.push_back("lipo");
|
|
Args.push_back("-create");
|
|
|
|
for (auto &Thin : ArchFiles)
|
|
Args.push_back(Thin.path());
|
|
|
|
// Align segments to match dsymutil-classic alignment
|
|
for (auto &Thin : ArchFiles) {
|
|
Thin.Arch = getArchName(Thin.Arch);
|
|
Args.push_back("-segalign");
|
|
Args.push_back(Thin.Arch);
|
|
Args.push_back("20");
|
|
}
|
|
|
|
Args.push_back("-output");
|
|
Args.push_back(OutputFileName.data());
|
|
|
|
if (Options.Verbose) {
|
|
outs() << "Running lipo\n";
|
|
for (auto Arg : Args)
|
|
outs() << ' ' << Arg;
|
|
outs() << "\n";
|
|
}
|
|
|
|
return Options.NoOutput ? true : runLipo(SDKPath, Args);
|
|
}
|
|
|
|
// Return a MachO::segment_command_64 that holds the same values as the passed
|
|
// MachO::segment_command. We do that to avoid having to duplicate the logic
|
|
// for 32bits and 64bits segments.
|
|
struct MachO::segment_command_64 adaptFrom32bits(MachO::segment_command Seg) {
|
|
MachO::segment_command_64 Seg64;
|
|
Seg64.cmd = Seg.cmd;
|
|
Seg64.cmdsize = Seg.cmdsize;
|
|
memcpy(Seg64.segname, Seg.segname, sizeof(Seg.segname));
|
|
Seg64.vmaddr = Seg.vmaddr;
|
|
Seg64.vmsize = Seg.vmsize;
|
|
Seg64.fileoff = Seg.fileoff;
|
|
Seg64.filesize = Seg.filesize;
|
|
Seg64.maxprot = Seg.maxprot;
|
|
Seg64.initprot = Seg.initprot;
|
|
Seg64.nsects = Seg.nsects;
|
|
Seg64.flags = Seg.flags;
|
|
return Seg64;
|
|
}
|
|
|
|
// Iterate on all \a Obj segments, and apply \a Handler to them.
|
|
template <typename FunctionTy>
|
|
static void iterateOnSegments(const object::MachOObjectFile &Obj,
|
|
FunctionTy Handler) {
|
|
for (const auto &LCI : Obj.load_commands()) {
|
|
MachO::segment_command_64 Segment;
|
|
if (LCI.C.cmd == MachO::LC_SEGMENT)
|
|
Segment = adaptFrom32bits(Obj.getSegmentLoadCommand(LCI));
|
|
else if (LCI.C.cmd == MachO::LC_SEGMENT_64)
|
|
Segment = Obj.getSegment64LoadCommand(LCI);
|
|
else
|
|
continue;
|
|
|
|
Handler(Segment);
|
|
}
|
|
}
|
|
|
|
// Transfer the symbols described by \a NList to \a NewSymtab which is just the
|
|
// raw contents of the symbol table for the dSYM companion file. \returns
|
|
// whether the symbol was transferred or not.
|
|
template <typename NListTy>
|
|
static bool transferSymbol(NListTy NList, bool IsLittleEndian,
|
|
StringRef Strings, SmallVectorImpl<char> &NewSymtab,
|
|
NonRelocatableStringpool &NewStrings,
|
|
bool &InDebugNote) {
|
|
// Do not transfer undefined symbols, we want real addresses.
|
|
if ((NList.n_type & MachO::N_TYPE) == MachO::N_UNDF)
|
|
return false;
|
|
|
|
StringRef Name = StringRef(Strings.begin() + NList.n_strx);
|
|
if (InDebugNote) {
|
|
InDebugNote =
|
|
(NList.n_type != MachO::N_SO) || (!Name.empty() && Name[0] != '\0');
|
|
return false;
|
|
} else if (NList.n_type == MachO::N_SO) {
|
|
InDebugNote = true;
|
|
return false;
|
|
}
|
|
|
|
// FIXME: The + 1 is here to mimic dsymutil-classic that has 2 empty
|
|
// strings at the start of the generated string table (There is
|
|
// corresponding code in the string table emission).
|
|
NList.n_strx = NewStrings.getStringOffset(Name) + 1;
|
|
if (IsLittleEndian != sys::IsLittleEndianHost)
|
|
MachO::swapStruct(NList);
|
|
|
|
NewSymtab.append(reinterpret_cast<char *>(&NList),
|
|
reinterpret_cast<char *>(&NList + 1));
|
|
return true;
|
|
}
|
|
|
|
// Wrapper around transferSymbol to transfer all of \a Obj symbols
|
|
// to \a NewSymtab. This function does not write in the output file.
|
|
// \returns the number of symbols in \a NewSymtab.
|
|
static unsigned transferSymbols(const object::MachOObjectFile &Obj,
|
|
SmallVectorImpl<char> &NewSymtab,
|
|
NonRelocatableStringpool &NewStrings) {
|
|
unsigned Syms = 0;
|
|
StringRef Strings = Obj.getStringTableData();
|
|
bool IsLittleEndian = Obj.isLittleEndian();
|
|
bool InDebugNote = false;
|
|
|
|
if (Obj.is64Bit()) {
|
|
for (const object::SymbolRef &Symbol : Obj.symbols()) {
|
|
object::DataRefImpl DRI = Symbol.getRawDataRefImpl();
|
|
if (transferSymbol(Obj.getSymbol64TableEntry(DRI), IsLittleEndian,
|
|
Strings, NewSymtab, NewStrings, InDebugNote))
|
|
++Syms;
|
|
}
|
|
} else {
|
|
for (const object::SymbolRef &Symbol : Obj.symbols()) {
|
|
object::DataRefImpl DRI = Symbol.getRawDataRefImpl();
|
|
if (transferSymbol(Obj.getSymbolTableEntry(DRI), IsLittleEndian, Strings,
|
|
NewSymtab, NewStrings, InDebugNote))
|
|
++Syms;
|
|
}
|
|
}
|
|
return Syms;
|
|
}
|
|
|
|
static MachO::section
|
|
getSection(const object::MachOObjectFile &Obj,
|
|
const MachO::segment_command &Seg,
|
|
const object::MachOObjectFile::LoadCommandInfo &LCI, unsigned Idx) {
|
|
return Obj.getSection(LCI, Idx);
|
|
}
|
|
|
|
static MachO::section_64
|
|
getSection(const object::MachOObjectFile &Obj,
|
|
const MachO::segment_command_64 &Seg,
|
|
const object::MachOObjectFile::LoadCommandInfo &LCI, unsigned Idx) {
|
|
return Obj.getSection64(LCI, Idx);
|
|
}
|
|
|
|
// Transfer \a Segment from \a Obj to the output file. This calls into \a Writer
|
|
// to write these load commands directly in the output file at the current
|
|
// position.
|
|
// The function also tries to find a hole in the address map to fit the __DWARF
|
|
// segment of \a DwarfSegmentSize size. \a EndAddress is updated to point at the
|
|
// highest segment address.
|
|
// When the __LINKEDIT segment is transferred, its offset and size are set resp.
|
|
// to \a LinkeditOffset and \a LinkeditSize.
|
|
template <typename SegmentTy>
|
|
static void transferSegmentAndSections(
|
|
const object::MachOObjectFile::LoadCommandInfo &LCI, SegmentTy Segment,
|
|
const object::MachOObjectFile &Obj, MachObjectWriter &Writer,
|
|
uint64_t LinkeditOffset, uint64_t LinkeditSize, uint64_t DwarfSegmentSize,
|
|
uint64_t &GapForDwarf, uint64_t &EndAddress) {
|
|
if (StringRef("__DWARF") == Segment.segname)
|
|
return;
|
|
|
|
Segment.fileoff = Segment.filesize = 0;
|
|
|
|
if (StringRef("__LINKEDIT") == Segment.segname) {
|
|
Segment.fileoff = LinkeditOffset;
|
|
Segment.filesize = LinkeditSize;
|
|
// Resize vmsize by rounding to the page size.
|
|
Segment.vmsize = alignTo(LinkeditSize, 0x1000);
|
|
}
|
|
|
|
// Check if the end address of the last segment and our current
|
|
// start address leave a sufficient gap to store the __DWARF
|
|
// segment.
|
|
uint64_t PrevEndAddress = EndAddress;
|
|
EndAddress = alignTo(EndAddress, 0x1000);
|
|
if (GapForDwarf == UINT64_MAX && Segment.vmaddr > EndAddress &&
|
|
Segment.vmaddr - EndAddress >= DwarfSegmentSize)
|
|
GapForDwarf = EndAddress;
|
|
|
|
// The segments are not necessarily sorted by their vmaddr.
|
|
EndAddress =
|
|
std::max<uint64_t>(PrevEndAddress, Segment.vmaddr + Segment.vmsize);
|
|
unsigned nsects = Segment.nsects;
|
|
if (Obj.isLittleEndian() != sys::IsLittleEndianHost)
|
|
MachO::swapStruct(Segment);
|
|
Writer.W.OS.write(reinterpret_cast<char *>(&Segment), sizeof(Segment));
|
|
for (unsigned i = 0; i < nsects; ++i) {
|
|
auto Sect = getSection(Obj, Segment, LCI, i);
|
|
Sect.offset = Sect.reloff = Sect.nreloc = 0;
|
|
if (Obj.isLittleEndian() != sys::IsLittleEndianHost)
|
|
MachO::swapStruct(Sect);
|
|
Writer.W.OS.write(reinterpret_cast<char *>(&Sect), sizeof(Sect));
|
|
}
|
|
}
|
|
|
|
// Write the __DWARF segment load command to the output file.
|
|
static void createDwarfSegment(uint64_t VMAddr, uint64_t FileOffset,
|
|
uint64_t FileSize, unsigned NumSections,
|
|
MCAsmLayout &Layout, MachObjectWriter &Writer) {
|
|
Writer.writeSegmentLoadCommand("__DWARF", NumSections, VMAddr,
|
|
alignTo(FileSize, 0x1000), FileOffset,
|
|
FileSize, /* MaxProt */ 7,
|
|
/* InitProt =*/3);
|
|
|
|
for (unsigned int i = 0, n = Layout.getSectionOrder().size(); i != n; ++i) {
|
|
MCSection *Sec = Layout.getSectionOrder()[i];
|
|
if (Sec->begin() == Sec->end() || !Layout.getSectionFileSize(Sec))
|
|
continue;
|
|
|
|
unsigned Align = Sec->getAlignment();
|
|
if (Align > 1) {
|
|
VMAddr = alignTo(VMAddr, Align);
|
|
FileOffset = alignTo(FileOffset, Align);
|
|
}
|
|
Writer.writeSection(Layout, *Sec, VMAddr, FileOffset, 0, 0, 0);
|
|
|
|
FileOffset += Layout.getSectionAddressSize(Sec);
|
|
VMAddr += Layout.getSectionAddressSize(Sec);
|
|
}
|
|
}
|
|
|
|
static bool isExecutable(const object::MachOObjectFile &Obj) {
|
|
if (Obj.is64Bit())
|
|
return Obj.getHeader64().filetype != MachO::MH_OBJECT;
|
|
else
|
|
return Obj.getHeader().filetype != MachO::MH_OBJECT;
|
|
}
|
|
|
|
static bool hasLinkEditSegment(const object::MachOObjectFile &Obj) {
|
|
bool HasLinkEditSegment = false;
|
|
iterateOnSegments(Obj, [&](const MachO::segment_command_64 &Segment) {
|
|
if (StringRef("__LINKEDIT") == Segment.segname)
|
|
HasLinkEditSegment = true;
|
|
});
|
|
return HasLinkEditSegment;
|
|
}
|
|
|
|
static unsigned segmentLoadCommandSize(bool Is64Bit, unsigned NumSections) {
|
|
if (Is64Bit)
|
|
return sizeof(MachO::segment_command_64) +
|
|
NumSections * sizeof(MachO::section_64);
|
|
|
|
return sizeof(MachO::segment_command) + NumSections * sizeof(MachO::section);
|
|
}
|
|
|
|
// Stream a dSYM companion binary file corresponding to the binary referenced
|
|
// by \a DM to \a OutFile. The passed \a MS MCStreamer is setup to write to
|
|
// \a OutFile and it must be using a MachObjectWriter object to do so.
|
|
bool generateDsymCompanion(const DebugMap &DM, MCStreamer &MS,
|
|
raw_fd_ostream &OutFile) {
|
|
auto &ObjectStreamer = static_cast<MCObjectStreamer &>(MS);
|
|
MCAssembler &MCAsm = ObjectStreamer.getAssembler();
|
|
auto &Writer = static_cast<MachObjectWriter &>(MCAsm.getWriter());
|
|
|
|
// Layout but don't emit.
|
|
ObjectStreamer.flushPendingLabels();
|
|
MCAsmLayout Layout(MCAsm);
|
|
MCAsm.layout(Layout);
|
|
|
|
BinaryHolder InputBinaryHolder(false);
|
|
|
|
auto ObjectEntry = InputBinaryHolder.getObjectEntry(DM.getBinaryPath());
|
|
if (!ObjectEntry) {
|
|
auto Err = ObjectEntry.takeError();
|
|
return error(Twine("opening ") + DM.getBinaryPath() + ": " +
|
|
toString(std::move(Err)),
|
|
"output file streaming");
|
|
}
|
|
|
|
auto Object =
|
|
ObjectEntry->getObjectAs<object::MachOObjectFile>(DM.getTriple());
|
|
if (!Object) {
|
|
auto Err = Object.takeError();
|
|
return error(Twine("opening ") + DM.getBinaryPath() + ": " +
|
|
toString(std::move(Err)),
|
|
"output file streaming");
|
|
}
|
|
|
|
auto &InputBinary = *Object;
|
|
|
|
bool Is64Bit = Writer.is64Bit();
|
|
MachO::symtab_command SymtabCmd = InputBinary.getSymtabLoadCommand();
|
|
|
|
// Get UUID.
|
|
MachO::uuid_command UUIDCmd;
|
|
memset(&UUIDCmd, 0, sizeof(UUIDCmd));
|
|
UUIDCmd.cmd = MachO::LC_UUID;
|
|
UUIDCmd.cmdsize = sizeof(MachO::uuid_command);
|
|
for (auto &LCI : InputBinary.load_commands()) {
|
|
if (LCI.C.cmd == MachO::LC_UUID) {
|
|
UUIDCmd = InputBinary.getUuidCommand(LCI);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Compute the number of load commands we will need.
|
|
unsigned LoadCommandSize = 0;
|
|
unsigned NumLoadCommands = 0;
|
|
// We will copy the UUID if there is one.
|
|
if (UUIDCmd.cmd != 0) {
|
|
++NumLoadCommands;
|
|
LoadCommandSize += sizeof(MachO::uuid_command);
|
|
}
|
|
|
|
// If we have a valid symtab to copy, do it.
|
|
bool ShouldEmitSymtab =
|
|
isExecutable(InputBinary) && hasLinkEditSegment(InputBinary);
|
|
if (ShouldEmitSymtab) {
|
|
LoadCommandSize += sizeof(MachO::symtab_command);
|
|
++NumLoadCommands;
|
|
}
|
|
|
|
unsigned HeaderSize =
|
|
Is64Bit ? sizeof(MachO::mach_header_64) : sizeof(MachO::mach_header);
|
|
// We will copy every segment that isn't __DWARF.
|
|
iterateOnSegments(InputBinary, [&](const MachO::segment_command_64 &Segment) {
|
|
if (StringRef("__DWARF") == Segment.segname)
|
|
return;
|
|
|
|
++NumLoadCommands;
|
|
LoadCommandSize += segmentLoadCommandSize(Is64Bit, Segment.nsects);
|
|
});
|
|
|
|
// We will add our own brand new __DWARF segment if we have debug
|
|
// info.
|
|
unsigned NumDwarfSections = 0;
|
|
uint64_t DwarfSegmentSize = 0;
|
|
|
|
for (unsigned int i = 0, n = Layout.getSectionOrder().size(); i != n; ++i) {
|
|
MCSection *Sec = Layout.getSectionOrder()[i];
|
|
if (Sec->begin() == Sec->end())
|
|
continue;
|
|
|
|
if (uint64_t Size = Layout.getSectionFileSize(Sec)) {
|
|
DwarfSegmentSize = alignTo(DwarfSegmentSize, Sec->getAlignment());
|
|
DwarfSegmentSize += Size;
|
|
++NumDwarfSections;
|
|
}
|
|
}
|
|
|
|
if (NumDwarfSections) {
|
|
++NumLoadCommands;
|
|
LoadCommandSize += segmentLoadCommandSize(Is64Bit, NumDwarfSections);
|
|
}
|
|
|
|
SmallString<0> NewSymtab;
|
|
NonRelocatableStringpool NewStrings;
|
|
unsigned NListSize = Is64Bit ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist);
|
|
unsigned NumSyms = 0;
|
|
uint64_t NewStringsSize = 0;
|
|
if (ShouldEmitSymtab) {
|
|
NewSymtab.reserve(SymtabCmd.nsyms * NListSize / 2);
|
|
NumSyms = transferSymbols(InputBinary, NewSymtab, NewStrings);
|
|
NewStringsSize = NewStrings.getSize() + 1;
|
|
}
|
|
|
|
uint64_t SymtabStart = LoadCommandSize;
|
|
SymtabStart += HeaderSize;
|
|
SymtabStart = alignTo(SymtabStart, 0x1000);
|
|
|
|
// We gathered all the information we need, start emitting the output file.
|
|
Writer.writeHeader(MachO::MH_DSYM, NumLoadCommands, LoadCommandSize, false);
|
|
|
|
// Write the load commands.
|
|
assert(OutFile.tell() == HeaderSize);
|
|
if (UUIDCmd.cmd != 0) {
|
|
Writer.W.write<uint32_t>(UUIDCmd.cmd);
|
|
Writer.W.write<uint32_t>(UUIDCmd.cmdsize);
|
|
OutFile.write(reinterpret_cast<const char *>(UUIDCmd.uuid), 16);
|
|
assert(OutFile.tell() == HeaderSize + sizeof(UUIDCmd));
|
|
}
|
|
|
|
assert(SymtabCmd.cmd && "No symbol table.");
|
|
uint64_t StringStart = SymtabStart + NumSyms * NListSize;
|
|
if (ShouldEmitSymtab)
|
|
Writer.writeSymtabLoadCommand(SymtabStart, NumSyms, StringStart,
|
|
NewStringsSize);
|
|
|
|
uint64_t DwarfSegmentStart = StringStart + NewStringsSize;
|
|
DwarfSegmentStart = alignTo(DwarfSegmentStart, 0x1000);
|
|
|
|
// Write the load commands for the segments and sections we 'import' from
|
|
// the original binary.
|
|
uint64_t EndAddress = 0;
|
|
uint64_t GapForDwarf = UINT64_MAX;
|
|
for (auto &LCI : InputBinary.load_commands()) {
|
|
if (LCI.C.cmd == MachO::LC_SEGMENT)
|
|
transferSegmentAndSections(LCI, InputBinary.getSegmentLoadCommand(LCI),
|
|
InputBinary, Writer, SymtabStart,
|
|
StringStart + NewStringsSize - SymtabStart,
|
|
DwarfSegmentSize, GapForDwarf, EndAddress);
|
|
else if (LCI.C.cmd == MachO::LC_SEGMENT_64)
|
|
transferSegmentAndSections(LCI, InputBinary.getSegment64LoadCommand(LCI),
|
|
InputBinary, Writer, SymtabStart,
|
|
StringStart + NewStringsSize - SymtabStart,
|
|
DwarfSegmentSize, GapForDwarf, EndAddress);
|
|
}
|
|
|
|
uint64_t DwarfVMAddr = alignTo(EndAddress, 0x1000);
|
|
uint64_t DwarfVMMax = Is64Bit ? UINT64_MAX : UINT32_MAX;
|
|
if (DwarfVMAddr + DwarfSegmentSize > DwarfVMMax ||
|
|
DwarfVMAddr + DwarfSegmentSize < DwarfVMAddr /* Overflow */) {
|
|
// There is no room for the __DWARF segment at the end of the
|
|
// address space. Look through segments to find a gap.
|
|
DwarfVMAddr = GapForDwarf;
|
|
if (DwarfVMAddr == UINT64_MAX)
|
|
warn("not enough VM space for the __DWARF segment.",
|
|
"output file streaming");
|
|
}
|
|
|
|
// Write the load command for the __DWARF segment.
|
|
createDwarfSegment(DwarfVMAddr, DwarfSegmentStart, DwarfSegmentSize,
|
|
NumDwarfSections, Layout, Writer);
|
|
|
|
assert(OutFile.tell() == LoadCommandSize + HeaderSize);
|
|
OutFile.write_zeros(SymtabStart - (LoadCommandSize + HeaderSize));
|
|
assert(OutFile.tell() == SymtabStart);
|
|
|
|
// Transfer symbols.
|
|
if (ShouldEmitSymtab) {
|
|
OutFile << NewSymtab.str();
|
|
assert(OutFile.tell() == StringStart);
|
|
|
|
// Transfer string table.
|
|
// FIXME: The NonRelocatableStringpool starts with an empty string, but
|
|
// dsymutil-classic starts the reconstructed string table with 2 of these.
|
|
// Reproduce that behavior for now (there is corresponding code in
|
|
// transferSymbol).
|
|
OutFile << '\0';
|
|
std::vector<DwarfStringPoolEntryRef> Strings =
|
|
NewStrings.getEntriesForEmission();
|
|
for (auto EntryRef : Strings) {
|
|
OutFile.write(EntryRef.getString().data(),
|
|
EntryRef.getString().size() + 1);
|
|
}
|
|
}
|
|
|
|
assert(OutFile.tell() == StringStart + NewStringsSize);
|
|
|
|
// Pad till the Dwarf segment start.
|
|
OutFile.write_zeros(DwarfSegmentStart - (StringStart + NewStringsSize));
|
|
assert(OutFile.tell() == DwarfSegmentStart);
|
|
|
|
// Emit the Dwarf sections contents.
|
|
for (const MCSection &Sec : MCAsm) {
|
|
if (Sec.begin() == Sec.end())
|
|
continue;
|
|
|
|
uint64_t Pos = OutFile.tell();
|
|
OutFile.write_zeros(alignTo(Pos, Sec.getAlignment()) - Pos);
|
|
MCAsm.writeSectionData(OutFile, &Sec, Layout);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
} // namespace MachOUtils
|
|
} // namespace dsymutil
|
|
} // namespace llvm
|