You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
4.1 KiB
117 lines
4.1 KiB
//===- ObjectFileTransformer.cpp --------------------------------*- C++ -*-===//
|
|
//
|
|
// 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 <unordered_set>
|
|
|
|
#include "llvm/Object/ELFObjectFile.h"
|
|
#include "llvm/Object/MachOUniversal.h"
|
|
#include "llvm/Object/ObjectFile.h"
|
|
#include "llvm/Support/DataExtractor.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
#include "llvm/DebugInfo/GSYM/ObjectFileTransformer.h"
|
|
#include "llvm/DebugInfo/GSYM/GsymCreator.h"
|
|
|
|
using namespace llvm;
|
|
using namespace gsym;
|
|
|
|
constexpr uint32_t NT_GNU_BUILD_ID_TAG = 0x03;
|
|
|
|
static std::vector<uint8_t> getUUID(const object::ObjectFile &Obj) {
|
|
// Extract the UUID from the object file
|
|
std::vector<uint8_t> UUID;
|
|
if (auto *MachO = dyn_cast<object::MachOObjectFile>(&Obj)) {
|
|
const ArrayRef<uint8_t> MachUUID = MachO->getUuid();
|
|
if (!MachUUID.empty())
|
|
UUID.assign(MachUUID.data(), MachUUID.data() + MachUUID.size());
|
|
} else if (isa<object::ELFObjectFileBase>(&Obj)) {
|
|
const StringRef GNUBuildID(".note.gnu.build-id");
|
|
for (const object::SectionRef &Sect : Obj.sections()) {
|
|
Expected<StringRef> SectNameOrErr = Sect.getName();
|
|
if (!SectNameOrErr) {
|
|
consumeError(SectNameOrErr.takeError());
|
|
continue;
|
|
}
|
|
StringRef SectName(*SectNameOrErr);
|
|
if (SectName != GNUBuildID)
|
|
continue;
|
|
StringRef BuildIDData;
|
|
Expected<StringRef> E = Sect.getContents();
|
|
if (E)
|
|
BuildIDData = *E;
|
|
else {
|
|
consumeError(E.takeError());
|
|
continue;
|
|
}
|
|
DataExtractor Decoder(BuildIDData, Obj.makeTriple().isLittleEndian(), 8);
|
|
uint64_t Offset = 0;
|
|
const uint32_t NameSize = Decoder.getU32(&Offset);
|
|
const uint32_t PayloadSize = Decoder.getU32(&Offset);
|
|
const uint32_t PayloadType = Decoder.getU32(&Offset);
|
|
StringRef Name(Decoder.getFixedLengthString(&Offset, NameSize));
|
|
if (Name == "GNU" && PayloadType == NT_GNU_BUILD_ID_TAG) {
|
|
Offset = alignTo(Offset, 4);
|
|
StringRef UUIDBytes(Decoder.getBytes(&Offset, PayloadSize));
|
|
if (!UUIDBytes.empty()) {
|
|
auto Ptr = reinterpret_cast<const uint8_t *>(UUIDBytes.data());
|
|
UUID.assign(Ptr, Ptr + UUIDBytes.size());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return UUID;
|
|
}
|
|
|
|
llvm::Error ObjectFileTransformer::convert(const object::ObjectFile &Obj,
|
|
raw_ostream &Log,
|
|
GsymCreator &Gsym) {
|
|
using namespace llvm::object;
|
|
|
|
const bool IsMachO = isa<MachOObjectFile>(&Obj);
|
|
const bool IsELF = isa<ELFObjectFileBase>(&Obj);
|
|
|
|
// Read build ID.
|
|
Gsym.setUUID(getUUID(Obj));
|
|
|
|
// Parse the symbol table.
|
|
size_t NumBefore = Gsym.getNumFunctionInfos();
|
|
for (const object::SymbolRef &Sym : Obj.symbols()) {
|
|
Expected<SymbolRef::Type> SymType = Sym.getType();
|
|
if (!SymType) {
|
|
consumeError(SymType.takeError());
|
|
continue;
|
|
}
|
|
Expected<uint64_t> AddrOrErr = Sym.getValue();
|
|
if (!AddrOrErr)
|
|
// TODO: Test this error.
|
|
return AddrOrErr.takeError();
|
|
|
|
if (SymType.get() != SymbolRef::Type::ST_Function ||
|
|
!Gsym.IsValidTextAddress(*AddrOrErr) ||
|
|
Gsym.hasFunctionInfoForAddress(*AddrOrErr))
|
|
continue;
|
|
// Function size for MachO files will be 0
|
|
constexpr bool NoCopy = false;
|
|
const uint64_t size = IsELF ? ELFSymbolRef(Sym).getSize() : 0;
|
|
Expected<StringRef> Name = Sym.getName();
|
|
if (!Name) {
|
|
logAllUnhandledErrors(Name.takeError(), Log, "ObjectFileTransformer: ");
|
|
continue;
|
|
}
|
|
// Remove the leading '_' character in any symbol names if there is one
|
|
// for mach-o files.
|
|
if (IsMachO)
|
|
Name->consume_front("_");
|
|
Gsym.addFunctionInfo(
|
|
FunctionInfo(*AddrOrErr, size, Gsym.insertString(*Name, NoCopy)));
|
|
}
|
|
size_t FunctionsAddedCount = Gsym.getNumFunctionInfos() - NumBefore;
|
|
Log << "Loaded " << FunctionsAddedCount << " functions from symbol table.\n";
|
|
return Error::success();
|
|
}
|