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llvm-project/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
Daniel Thornburgh e61d89efd7 [NFC] [Object] Create library to fetch debug info by build ID. 
This creates a library for fetching debug info by build ID, whether
locally or remotely via debuginfod. The functionality was refactored
out of existing code in the Symboliize library. Existing utilities
were refactored to use this library.

Reviewed By: phosek

Differential Revision: https://reviews.llvm.org/D132504
2022-09-28 13:35:35 -07:00

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//===-- LLVMSymbolize.cpp -------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Implementation for LLVM symbolization library.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/Symbolize/Symbolize.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/PDB/PDB.h"
#include "llvm/DebugInfo/PDB/PDBContext.h"
#include "llvm/DebugInfo/Symbolize/SymbolizableObjectFile.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/Object/BuildID.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Support/CRC.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Errc.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include <algorithm>
#include <cassert>
#include <cstring>
namespace llvm {
namespace codeview {
union DebugInfo;
}
namespace object {
template <class ELFT> class ELFFile;
}
namespace symbolize {
LLVMSymbolizer::LLVMSymbolizer() = default;
LLVMSymbolizer::LLVMSymbolizer(const Options &Opts)
: Opts(Opts),
BIDFetcher(std::make_unique<BuildIDFetcher>(Opts.DebugFileDirectory)) {}
LLVMSymbolizer::~LLVMSymbolizer() = default;
template <typename T>
Expected<DILineInfo>
LLVMSymbolizer::symbolizeCodeCommon(const T &ModuleSpecifier,
object::SectionedAddress ModuleOffset) {
auto InfoOrErr = getOrCreateModuleInfo(ModuleSpecifier);
if (!InfoOrErr)
return InfoOrErr.takeError();
SymbolizableModule *Info = *InfoOrErr;
// A null module means an error has already been reported. Return an empty
// result.
if (!Info)
return DILineInfo();
// If the user is giving us relative addresses, add the preferred base of the
// object to the offset before we do the query. It's what DIContext expects.
if (Opts.RelativeAddresses)
ModuleOffset.Address += Info->getModulePreferredBase();
DILineInfo LineInfo = Info->symbolizeCode(
ModuleOffset, DILineInfoSpecifier(Opts.PathStyle, Opts.PrintFunctions),
Opts.UseSymbolTable);
if (Opts.Demangle)
LineInfo.FunctionName = DemangleName(LineInfo.FunctionName, Info);
return LineInfo;
}
Expected<DILineInfo>
LLVMSymbolizer::symbolizeCode(const ObjectFile &Obj,
object::SectionedAddress ModuleOffset) {
return symbolizeCodeCommon(Obj, ModuleOffset);
}
Expected<DILineInfo>
LLVMSymbolizer::symbolizeCode(const std::string &ModuleName,
object::SectionedAddress ModuleOffset) {
return symbolizeCodeCommon(ModuleName, ModuleOffset);
}
Expected<DILineInfo>
LLVMSymbolizer::symbolizeCode(ArrayRef<uint8_t> BuildID,
object::SectionedAddress ModuleOffset) {
return symbolizeCodeCommon(BuildID, ModuleOffset);
}
template <typename T>
Expected<DIInliningInfo> LLVMSymbolizer::symbolizeInlinedCodeCommon(
const T &ModuleSpecifier, object::SectionedAddress ModuleOffset) {
auto InfoOrErr = getOrCreateModuleInfo(ModuleSpecifier);
if (!InfoOrErr)
return InfoOrErr.takeError();
SymbolizableModule *Info = *InfoOrErr;
// A null module means an error has already been reported. Return an empty
// result.
if (!Info)
return DIInliningInfo();
// If the user is giving us relative addresses, add the preferred base of the
// object to the offset before we do the query. It's what DIContext expects.
if (Opts.RelativeAddresses)
ModuleOffset.Address += Info->getModulePreferredBase();
DIInliningInfo InlinedContext = Info->symbolizeInlinedCode(
ModuleOffset, DILineInfoSpecifier(Opts.PathStyle, Opts.PrintFunctions),
Opts.UseSymbolTable);
if (Opts.Demangle) {
for (int i = 0, n = InlinedContext.getNumberOfFrames(); i < n; i++) {
auto *Frame = InlinedContext.getMutableFrame(i);
Frame->FunctionName = DemangleName(Frame->FunctionName, Info);
}
}
return InlinedContext;
}
Expected<DIInliningInfo>
LLVMSymbolizer::symbolizeInlinedCode(const ObjectFile &Obj,
object::SectionedAddress ModuleOffset) {
return symbolizeInlinedCodeCommon(Obj, ModuleOffset);
}
Expected<DIInliningInfo>
LLVMSymbolizer::symbolizeInlinedCode(const std::string &ModuleName,
object::SectionedAddress ModuleOffset) {
return symbolizeInlinedCodeCommon(ModuleName, ModuleOffset);
}
Expected<DIInliningInfo>
LLVMSymbolizer::symbolizeInlinedCode(ArrayRef<uint8_t> BuildID,
object::SectionedAddress ModuleOffset) {
return symbolizeInlinedCodeCommon(BuildID, ModuleOffset);
}
template <typename T>
Expected<DIGlobal>
LLVMSymbolizer::symbolizeDataCommon(const T &ModuleSpecifier,
object::SectionedAddress ModuleOffset) {
auto InfoOrErr = getOrCreateModuleInfo(ModuleSpecifier);
if (!InfoOrErr)
return InfoOrErr.takeError();
SymbolizableModule *Info = *InfoOrErr;
// A null module means an error has already been reported. Return an empty
// result.
if (!Info)
return DIGlobal();
// If the user is giving us relative addresses, add the preferred base of
// the object to the offset before we do the query. It's what DIContext
// expects.
if (Opts.RelativeAddresses)
ModuleOffset.Address += Info->getModulePreferredBase();
DIGlobal Global = Info->symbolizeData(ModuleOffset);
if (Opts.Demangle)
Global.Name = DemangleName(Global.Name, Info);
return Global;
}
Expected<DIGlobal>
LLVMSymbolizer::symbolizeData(const ObjectFile &Obj,
object::SectionedAddress ModuleOffset) {
return symbolizeDataCommon(Obj, ModuleOffset);
}
Expected<DIGlobal>
LLVMSymbolizer::symbolizeData(const std::string &ModuleName,
object::SectionedAddress ModuleOffset) {
return symbolizeDataCommon(ModuleName, ModuleOffset);
}
Expected<DIGlobal>
LLVMSymbolizer::symbolizeData(ArrayRef<uint8_t> BuildID,
object::SectionedAddress ModuleOffset) {
return symbolizeDataCommon(BuildID, ModuleOffset);
}
template <typename T>
Expected<std::vector<DILocal>>
LLVMSymbolizer::symbolizeFrameCommon(const T &ModuleSpecifier,
object::SectionedAddress ModuleOffset) {
auto InfoOrErr = getOrCreateModuleInfo(ModuleSpecifier);
if (!InfoOrErr)
return InfoOrErr.takeError();
SymbolizableModule *Info = *InfoOrErr;
// A null module means an error has already been reported. Return an empty
// result.
if (!Info)
return std::vector<DILocal>();
// If the user is giving us relative addresses, add the preferred base of
// the object to the offset before we do the query. It's what DIContext
// expects.
if (Opts.RelativeAddresses)
ModuleOffset.Address += Info->getModulePreferredBase();
return Info->symbolizeFrame(ModuleOffset);
}
Expected<std::vector<DILocal>>
LLVMSymbolizer::symbolizeFrame(const ObjectFile &Obj,
object::SectionedAddress ModuleOffset) {
return symbolizeFrameCommon(Obj, ModuleOffset);
}
Expected<std::vector<DILocal>>
LLVMSymbolizer::symbolizeFrame(const std::string &ModuleName,
object::SectionedAddress ModuleOffset) {
return symbolizeFrameCommon(ModuleName, ModuleOffset);
}
Expected<std::vector<DILocal>>
LLVMSymbolizer::symbolizeFrame(ArrayRef<uint8_t> BuildID,
object::SectionedAddress ModuleOffset) {
return symbolizeFrameCommon(BuildID, ModuleOffset);
}
void LLVMSymbolizer::flush() {
ObjectForUBPathAndArch.clear();
LRUBinaries.clear();
CacheSize = 0;
BinaryForPath.clear();
ObjectPairForPathArch.clear();
Modules.clear();
BuildIDPaths.clear();
}
namespace {
// For Path="/path/to/foo" and Basename="foo" assume that debug info is in
// /path/to/foo.dSYM/Contents/Resources/DWARF/foo.
// For Path="/path/to/bar.dSYM" and Basename="foo" assume that debug info is in
// /path/to/bar.dSYM/Contents/Resources/DWARF/foo.
std::string getDarwinDWARFResourceForPath(const std::string &Path,
const std::string &Basename) {
SmallString<16> ResourceName = StringRef(Path);
if (sys::path::extension(Path) != ".dSYM") {
ResourceName += ".dSYM";
}
sys::path::append(ResourceName, "Contents", "Resources", "DWARF");
sys::path::append(ResourceName, Basename);
return std::string(ResourceName.str());
}
bool checkFileCRC(StringRef Path, uint32_t CRCHash) {
ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
MemoryBuffer::getFileOrSTDIN(Path);
if (!MB)
return false;
return CRCHash == llvm::crc32(arrayRefFromStringRef(MB.get()->getBuffer()));
}
bool getGNUDebuglinkContents(const ObjectFile *Obj, std::string &DebugName,
uint32_t &CRCHash) {
if (!Obj)
return false;
for (const SectionRef &Section : Obj->sections()) {
StringRef Name;
consumeError(Section.getName().moveInto(Name));
Name = Name.substr(Name.find_first_not_of("._"));
if (Name == "gnu_debuglink") {
Expected<StringRef> ContentsOrErr = Section.getContents();
if (!ContentsOrErr) {
consumeError(ContentsOrErr.takeError());
return false;
}
DataExtractor DE(*ContentsOrErr, Obj->isLittleEndian(), 0);
uint64_t Offset = 0;
if (const char *DebugNameStr = DE.getCStr(&Offset)) {
// 4-byte align the offset.
Offset = (Offset + 3) & ~0x3;
if (DE.isValidOffsetForDataOfSize(Offset, 4)) {
DebugName = DebugNameStr;
CRCHash = DE.getU32(&Offset);
return true;
}
}
break;
}
}
return false;
}
bool darwinDsymMatchesBinary(const MachOObjectFile *DbgObj,
const MachOObjectFile *Obj) {
ArrayRef<uint8_t> dbg_uuid = DbgObj->getUuid();
ArrayRef<uint8_t> bin_uuid = Obj->getUuid();
if (dbg_uuid.empty() || bin_uuid.empty())
return false;
return !memcmp(dbg_uuid.data(), bin_uuid.data(), dbg_uuid.size());
}
} // end anonymous namespace
ObjectFile *LLVMSymbolizer::lookUpDsymFile(const std::string &ExePath,
const MachOObjectFile *MachExeObj,
const std::string &ArchName) {
// On Darwin we may find DWARF in separate object file in
// resource directory.
std::vector<std::string> DsymPaths;
StringRef Filename = sys::path::filename(ExePath);
DsymPaths.push_back(
getDarwinDWARFResourceForPath(ExePath, std::string(Filename)));
for (const auto &Path : Opts.DsymHints) {
DsymPaths.push_back(
getDarwinDWARFResourceForPath(Path, std::string(Filename)));
}
for (const auto &Path : DsymPaths) {
auto DbgObjOrErr = getOrCreateObject(Path, ArchName);
if (!DbgObjOrErr) {
// Ignore errors, the file might not exist.
consumeError(DbgObjOrErr.takeError());
continue;
}
ObjectFile *DbgObj = DbgObjOrErr.get();
if (!DbgObj)
continue;
const MachOObjectFile *MachDbgObj = dyn_cast<const MachOObjectFile>(DbgObj);
if (!MachDbgObj)
continue;
if (darwinDsymMatchesBinary(MachDbgObj, MachExeObj))
return DbgObj;
}
return nullptr;
}
ObjectFile *LLVMSymbolizer::lookUpDebuglinkObject(const std::string &Path,
const ObjectFile *Obj,
const std::string &ArchName) {
std::string DebuglinkName;
uint32_t CRCHash;
std::string DebugBinaryPath;
if (!getGNUDebuglinkContents(Obj, DebuglinkName, CRCHash))
return nullptr;
if (!findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath))
return nullptr;
auto DbgObjOrErr = getOrCreateObject(DebugBinaryPath, ArchName);
if (!DbgObjOrErr) {
// Ignore errors, the file might not exist.
consumeError(DbgObjOrErr.takeError());
return nullptr;
}
return DbgObjOrErr.get();
}
ObjectFile *LLVMSymbolizer::lookUpBuildIDObject(const std::string &Path,
const ELFObjectFileBase *Obj,
const std::string &ArchName) {
auto BuildID = getBuildID(Obj);
if (!BuildID)
return nullptr;
if (BuildID->size() < 2)
return nullptr;
std::string DebugBinaryPath;
if (!getOrFindDebugBinary(*BuildID, DebugBinaryPath))
return nullptr;
auto DbgObjOrErr = getOrCreateObject(DebugBinaryPath, ArchName);
if (!DbgObjOrErr) {
consumeError(DbgObjOrErr.takeError());
return nullptr;
}
return DbgObjOrErr.get();
}
bool LLVMSymbolizer::findDebugBinary(const std::string &OrigPath,
const std::string &DebuglinkName,
uint32_t CRCHash, std::string &Result) {
SmallString<16> OrigDir(OrigPath);
llvm::sys::path::remove_filename(OrigDir);
SmallString<16> DebugPath = OrigDir;
// Try relative/path/to/original_binary/debuglink_name
llvm::sys::path::append(DebugPath, DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = std::string(DebugPath.str());
return true;
}
// Try relative/path/to/original_binary/.debug/debuglink_name
DebugPath = OrigDir;
llvm::sys::path::append(DebugPath, ".debug", DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = std::string(DebugPath.str());
return true;
}
// Make the path absolute so that lookups will go to
// "/usr/lib/debug/full/path/to/debug", not
// "/usr/lib/debug/to/debug"
llvm::sys::fs::make_absolute(OrigDir);
if (!Opts.FallbackDebugPath.empty()) {
// Try <FallbackDebugPath>/absolute/path/to/original_binary/debuglink_name
DebugPath = Opts.FallbackDebugPath;
} else {
#if defined(__NetBSD__)
// Try /usr/libdata/debug/absolute/path/to/original_binary/debuglink_name
DebugPath = "/usr/libdata/debug";
#else
// Try /usr/lib/debug/absolute/path/to/original_binary/debuglink_name
DebugPath = "/usr/lib/debug";
#endif
}
llvm::sys::path::append(DebugPath, llvm::sys::path::relative_path(OrigDir),
DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = std::string(DebugPath.str());
return true;
}
return false;
}
static StringRef getBuildIDStr(ArrayRef<uint8_t> BuildID) {
return StringRef(reinterpret_cast<const char *>(BuildID.data()),
BuildID.size());
}
bool LLVMSymbolizer::getOrFindDebugBinary(const ArrayRef<uint8_t> BuildID,
std::string &Result) {
StringRef BuildIDStr = getBuildIDStr(BuildID);
auto I = BuildIDPaths.find(BuildIDStr);
if (I != BuildIDPaths.end()) {
Result = I->second;
return true;
}
if (!BIDFetcher)
return false;
if (Optional<std::string> Path = BIDFetcher->fetch(BuildID)) {
Result = *Path;
auto InsertResult = BuildIDPaths.insert({BuildIDStr, Result});
assert(InsertResult.second);
(void)InsertResult;
return true;
}
return false;
}
Expected<LLVMSymbolizer::ObjectPair>
LLVMSymbolizer::getOrCreateObjectPair(const std::string &Path,
const std::string &ArchName) {
auto I = ObjectPairForPathArch.find(std::make_pair(Path, ArchName));
if (I != ObjectPairForPathArch.end()) {
recordAccess(BinaryForPath.find(Path)->second);
return I->second;
}
auto ObjOrErr = getOrCreateObject(Path, ArchName);
if (!ObjOrErr) {
ObjectPairForPathArch.emplace(std::make_pair(Path, ArchName),
ObjectPair(nullptr, nullptr));
return ObjOrErr.takeError();
}
ObjectFile *Obj = ObjOrErr.get();
assert(Obj != nullptr);
ObjectFile *DbgObj = nullptr;
if (auto MachObj = dyn_cast<const MachOObjectFile>(Obj))
DbgObj = lookUpDsymFile(Path, MachObj, ArchName);
else if (auto ELFObj = dyn_cast<const ELFObjectFileBase>(Obj))
DbgObj = lookUpBuildIDObject(Path, ELFObj, ArchName);
if (!DbgObj)
DbgObj = lookUpDebuglinkObject(Path, Obj, ArchName);
if (!DbgObj)
DbgObj = Obj;
ObjectPair Res = std::make_pair(Obj, DbgObj);
std::string DbgObjPath = DbgObj->getFileName().str();
auto Pair =
ObjectPairForPathArch.emplace(std::make_pair(Path, ArchName), Res);
BinaryForPath.find(DbgObjPath)->second.pushEvictor([this, I = Pair.first]() {
ObjectPairForPathArch.erase(I);
});
return Res;
}
Expected<ObjectFile *>
LLVMSymbolizer::getOrCreateObject(const std::string &Path,
const std::string &ArchName) {
Binary *Bin;
auto Pair = BinaryForPath.emplace(Path, OwningBinary<Binary>());
if (!Pair.second) {
Bin = Pair.first->second->getBinary();
recordAccess(Pair.first->second);
} else {
Expected<OwningBinary<Binary>> BinOrErr = createBinary(Path);
if (!BinOrErr)
return BinOrErr.takeError();
CachedBinary &CachedBin = Pair.first->second;
CachedBin = std::move(BinOrErr.get());
CachedBin.pushEvictor([this, I = Pair.first]() { BinaryForPath.erase(I); });
LRUBinaries.push_back(CachedBin);
CacheSize += CachedBin.size();
Bin = CachedBin->getBinary();
}
if (!Bin)
return static_cast<ObjectFile *>(nullptr);
if (MachOUniversalBinary *UB = dyn_cast_or_null<MachOUniversalBinary>(Bin)) {
auto I = ObjectForUBPathAndArch.find(std::make_pair(Path, ArchName));
if (I != ObjectForUBPathAndArch.end())
return I->second.get();
Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
UB->getMachOObjectForArch(ArchName);
if (!ObjOrErr) {
ObjectForUBPathAndArch.emplace(std::make_pair(Path, ArchName),
std::unique_ptr<ObjectFile>());
return ObjOrErr.takeError();
}
ObjectFile *Res = ObjOrErr->get();
auto Pair = ObjectForUBPathAndArch.emplace(std::make_pair(Path, ArchName),
std::move(ObjOrErr.get()));
BinaryForPath.find(Path)->second.pushEvictor(
[this, Iter = Pair.first]() { ObjectForUBPathAndArch.erase(Iter); });
return Res;
}
if (Bin->isObject()) {
return cast<ObjectFile>(Bin);
}
return errorCodeToError(object_error::arch_not_found);
}
Expected<SymbolizableModule *>
LLVMSymbolizer::createModuleInfo(const ObjectFile *Obj,
std::unique_ptr<DIContext> Context,
StringRef ModuleName) {
auto InfoOrErr = SymbolizableObjectFile::create(Obj, std::move(Context),
Opts.UntagAddresses);
std::unique_ptr<SymbolizableModule> SymMod;
if (InfoOrErr)
SymMod = std::move(*InfoOrErr);
auto InsertResult = Modules.insert(
std::make_pair(std::string(ModuleName), std::move(SymMod)));
assert(InsertResult.second);
if (!InfoOrErr)
return InfoOrErr.takeError();
return InsertResult.first->second.get();
}
Expected<SymbolizableModule *>
LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName) {
std::string BinaryName = ModuleName;
std::string ArchName = Opts.DefaultArch;
size_t ColonPos = ModuleName.find_last_of(':');
// Verify that substring after colon form a valid arch name.
if (ColonPos != std::string::npos) {
std::string ArchStr = ModuleName.substr(ColonPos + 1);
if (Triple(ArchStr).getArch() != Triple::UnknownArch) {
BinaryName = ModuleName.substr(0, ColonPos);
ArchName = ArchStr;
}
}
auto I = Modules.find(ModuleName);
if (I != Modules.end()) {
recordAccess(BinaryForPath.find(BinaryName)->second);
return I->second.get();
}
auto ObjectsOrErr = getOrCreateObjectPair(BinaryName, ArchName);
if (!ObjectsOrErr) {
// Failed to find valid object file.
Modules.emplace(ModuleName, std::unique_ptr<SymbolizableModule>());
return ObjectsOrErr.takeError();
}
ObjectPair Objects = ObjectsOrErr.get();
std::unique_ptr<DIContext> Context;
// If this is a COFF object containing PDB info, use a PDBContext to
// symbolize. Otherwise, use DWARF.
if (auto CoffObject = dyn_cast<COFFObjectFile>(Objects.first)) {
const codeview::DebugInfo *DebugInfo;
StringRef PDBFileName;
auto EC = CoffObject->getDebugPDBInfo(DebugInfo, PDBFileName);
if (!EC && DebugInfo != nullptr && !PDBFileName.empty()) {
using namespace pdb;
std::unique_ptr<IPDBSession> Session;
PDB_ReaderType ReaderType =
Opts.UseDIA ? PDB_ReaderType::DIA : PDB_ReaderType::Native;
if (auto Err = loadDataForEXE(ReaderType, Objects.first->getFileName(),
Session)) {
Modules.emplace(ModuleName, std::unique_ptr<SymbolizableModule>());
// Return along the PDB filename to provide more context
return createFileError(PDBFileName, std::move(Err));
}
Context.reset(new PDBContext(*CoffObject, std::move(Session)));
}
}
if (!Context)
Context = DWARFContext::create(
*Objects.second, DWARFContext::ProcessDebugRelocations::Process,
nullptr, Opts.DWPName);
auto ModuleOrErr =
createModuleInfo(Objects.first, std::move(Context), ModuleName);
if (ModuleOrErr) {
auto I = Modules.find(ModuleName);
BinaryForPath.find(BinaryName)->second.pushEvictor([this, I]() {
Modules.erase(I);
});
}
return ModuleOrErr;
}
Expected<SymbolizableModule *>
LLVMSymbolizer::getOrCreateModuleInfo(const ObjectFile &Obj) {
StringRef ObjName = Obj.getFileName();
auto I = Modules.find(ObjName);
if (I != Modules.end())
return I->second.get();
std::unique_ptr<DIContext> Context = DWARFContext::create(Obj);
// FIXME: handle COFF object with PDB info to use PDBContext
return createModuleInfo(&Obj, std::move(Context), ObjName);
}
Expected<SymbolizableModule *>
LLVMSymbolizer::getOrCreateModuleInfo(ArrayRef<uint8_t> BuildID) {
std::string Path;
if (!getOrFindDebugBinary(BuildID, Path)) {
return createStringError(errc::no_such_file_or_directory,
Twine("could not find build ID '") +
toHex(BuildID) + "'");
}
return getOrCreateModuleInfo(Path);
}
namespace {
// Undo these various manglings for Win32 extern "C" functions:
// cdecl - _foo
// stdcall - _foo@12
// fastcall - @foo@12
// vectorcall - foo@@12
// These are all different linkage names for 'foo'.
StringRef demanglePE32ExternCFunc(StringRef SymbolName) {
// Remove any '_' or '@' prefix.
char Front = SymbolName.empty() ? '\0' : SymbolName[0];
if (Front == '_' || Front == '@')
SymbolName = SymbolName.drop_front();
// Remove any '@[0-9]+' suffix.
if (Front != '?') {
size_t AtPos = SymbolName.rfind('@');
if (AtPos != StringRef::npos &&
all_of(drop_begin(SymbolName, AtPos + 1), isDigit))
SymbolName = SymbolName.substr(0, AtPos);
}
// Remove any ending '@' for vectorcall.
if (SymbolName.endswith("@"))
SymbolName = SymbolName.drop_back();
return SymbolName;
}
} // end anonymous namespace
std::string
LLVMSymbolizer::DemangleName(const std::string &Name,
const SymbolizableModule *DbiModuleDescriptor) {
std::string Result;
if (nonMicrosoftDemangle(Name.c_str(), Result))
return Result;
if (!Name.empty() && Name.front() == '?') {
// Only do MSVC C++ demangling on symbols starting with '?'.
int status = 0;
char *DemangledName = microsoftDemangle(
Name.c_str(), nullptr, nullptr, nullptr, &status,
MSDemangleFlags(MSDF_NoAccessSpecifier | MSDF_NoCallingConvention |
MSDF_NoMemberType | MSDF_NoReturnType));
if (status != 0)
return Name;
Result = DemangledName;
free(DemangledName);
return Result;
}
if (DbiModuleDescriptor && DbiModuleDescriptor->isWin32Module())
return std::string(demanglePE32ExternCFunc(Name));
return Name;
}
void LLVMSymbolizer::recordAccess(CachedBinary &Bin) {
if (Bin->getBinary())
LRUBinaries.splice(LRUBinaries.end(), LRUBinaries, Bin.getIterator());
}
void LLVMSymbolizer::pruneCache() {
// Evict the LRU binary until the max cache size is reached or there's <= 1
// item in the cache. The MRU binary is always kept to avoid thrashing if it's
// larger than the cache size.
while (CacheSize > Opts.MaxCacheSize && !LRUBinaries.empty() &&
std::next(LRUBinaries.begin()) != LRUBinaries.end()) {
CachedBinary &Bin = LRUBinaries.front();
CacheSize -= Bin.size();
LRUBinaries.pop_front();
Bin.evict();
}
}
void CachedBinary::pushEvictor(std::function<void()> NewEvictor) {
if (Evictor) {
this->Evictor = [OldEvictor = std::move(this->Evictor),
NewEvictor = std::move(NewEvictor)]() {
NewEvictor();
OldEvictor();
};
} else {
this->Evictor = std::move(NewEvictor);
}
}
} // namespace symbolize
} // namespace llvm
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