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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "CASDWARFObject.h"
#include "llvm/CASObjectFormats/Encoding.h"
#include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
#include "llvm/Object/MachO.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/FormatVariadic.h"
using namespace llvm;
using namespace llvm::cas;
using namespace llvm::mccasformats::v1;
namespace {
/// Parse the MachO header to extract details such as endianness.
/// Unfortunately object::MachOObjectfile() doesn't support parsing
/// incomplete files.
struct MachOHeaderParser {
bool Is64Bit = true;
bool IsLittleEndian = true;
/// Stolen from MachOObjectfile.
template <typename T>
Expected<T> getStructOrErr(StringRef Data, const char *P) {
// Don't read before the beginning or past the end of the file
if (P < Data.begin() || P + sizeof(T) > Data.end())
return make_error<llvm::object::GenericBinaryError>(
"Structure read out-of-range");
T Cmd;
memcpy(&Cmd, P, sizeof(T));
if (IsLittleEndian != sys::IsLittleEndianHost)
MachO::swapStruct(Cmd);
return Cmd;
}
/// Parse an mc::header.
Error parse(StringRef Data) {
// MachO 64-bit header.
const char *P = Data.data();
auto Header64 = getStructOrErr<MachO::mach_header_64>(Data, P);
P += sizeof(MachO::mach_header_64);
if (!Header64)
return Header64.takeError();
if (Header64->magic == MachO::MH_MAGIC_64) {
Is64Bit = true;
IsLittleEndian = true;
} else {
return make_error<object::GenericBinaryError>("Unsupported MachO format");
}
return Error::success();
}
};
} // namespace
Error CASDWARFObject::discoverDwarfSections(ObjectRef CASObj) {
if (CASObj == Schema.getRootNodeTypeID())
return Error::success();
Expected<MCObjectProxy> MCObj = Schema.get(CASObj);
if (!MCObj)
return MCObj.takeError();
return discoverDwarfSections(*MCObj);
}
Error CASDWARFObject::discoverDwarfSections(MCObjectProxy MCObj) {
StringRef Data = MCObj.getData();
if (auto MCAssRef = MCAssemblerRef::Cast(MCObj)) {
StringRef Remaining = MCAssRef->getData();
uint32_t NormalizedTripleSize;
if (auto E = casobjectformats::encoding::consumeVBR8(Remaining,
NormalizedTripleSize))
return E;
auto TripleStr = Remaining.take_front(NormalizedTripleSize);
Triple Target(TripleStr);
this->Target = Target;
}
if (HeaderRef::Cast(MCObj)) {
MachOHeaderParser P;
if (Error Err = P.parse(MCObj.getData()))
return Err;
Is64Bit = P.Is64Bit;
IsLittleEndian = P.IsLittleEndian;
} else if (auto LineSectionRef = DebugLineSectionRef::Cast(MCObj)) {
raw_svector_ostream OS(DebugLineSection);
MCCASReader Reader(OS, Target, MCObj.getSchema());
auto Written = LineSectionRef->materialize(Reader);
if (!Written)
return Written.takeError();
}
if (DebugStrRef::Cast(MCObj)) {
MapOfStringOffsets.try_emplace(MCObj.getRef(), DebugStringSection.size());
DebugStringSection.append(Data.begin(), Data.end());
DebugStringSection.push_back(0);
}
if (DebugAbbrevSectionRef::Cast(MCObj) || GroupRef::Cast(MCObj) ||
SymbolTableRef::Cast(MCObj) || SectionRef::Cast(MCObj) ||
DebugLineSectionRef::Cast(MCObj) || AtomRef::Cast(MCObj)) {
auto Refs = MCObjectProxy::decodeReferences(MCObj, Data);
if (!Refs)
return Refs.takeError();
for (auto Ref : *Refs) {
if (Error E = discoverDwarfSections(Ref))
return E;
}
return Error::success();
}
return MCObj.forEachReference(
[this](ObjectRef CASObj) { return discoverDwarfSections(CASObj); });
}
Error CASDWARFObject::dump(raw_ostream &OS, int Indent, DWARFContext &DWARFCtx,
MCObjectProxy MCObj, bool Verbose) {
OS.indent(Indent);
DIDumpOptions DumpOpts;
DumpOpts.ShowChildren = true;
DumpOpts.Verbose = Verbose;
StringRef Data = MCObj.getData();
if (Data.empty())
return Error::success();
if (DebugStrRef::Cast(MCObj)) {
// Dump __debug_str data.
assert(Data.data()[Data.size()] == 0);
DataExtractor StrData(StringRef(Data.data(), Data.size() + 1),
isLittleEndian(), 0);
// This is almost identical with the DumpStrSection lambda in
// DWARFContext.cpp
uint64_t Offset = 0;
uint64_t StrOffset = 0;
Error Err = Error::success();
while (StrData.isValidOffset(Offset)) {
const char *CStr = StrData.getCStr(&Offset, &Err);
if (Err)
return Err;
OS << format("0x%8.8" PRIx64 ": \"", StrOffset);
OS.write_escaped(CStr);
OS << "\"\n";
StrOffset = Offset;
}
} else if (DebugLineSectionRef::Cast(MCObj)) {
// Dump __debug_line data.
uint64_t Address = 0;
DWARFDataExtractor LineData(*this, {toStringRef(DebugLineSection), Address},
isLittleEndian(), 0);
DWARFDebugLine::SectionParser Parser(LineData, DWARFCtx,
DWARFCtx.normal_units());
while (!Parser.done()) {
OS << "debug_line[" << format("0x%8.8" PRIx64, Parser.getOffset())
<< "]\n";
Parser.parseNext(DumpOpts.WarningHandler, DumpOpts.WarningHandler, &OS,
DumpOpts.Verbose);
}
}
return Error::success();
}
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