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llvm/lib/DebugInfo/Symbolize/Symbolize.cpp
Alexey Samsonov 9dcc66e06e [Symbolize] Improve the ownership of parsed objects. 
This code changes the way Symbolize handles parsed binaries: now
parsed OwningBinary<Binary> is not broken into (binary, memory buffer)
pair, and is just stored as-is in a cache. ObjectFile components
of Mach-O universal binaries are also stored explicitly in a
separate cache.

Additionally, this change:
* simplifies the code that parses/caches binaries: it's now done
  in a single place, not three different functions.
* makes flush() method behave as expected, and actually clear
  the cached parsed binaries and objects.
* fixes a dangling pointer issue described in
  http://reviews.llvm.org/D15638

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256041 91177308-0d34-0410-b5e6-96231b3b80d8
2015-12-18 22:02:14 +00:00

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//===-- LLVMSymbolize.cpp -------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Implementation for LLVM symbolization library.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/Symbolize/Symbolize.h"
#include "SymbolizableObjectFile.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Config/config.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/DebugInfo/PDB/PDB.h"
#include "llvm/DebugInfo/PDB/PDBContext.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Support/COFF.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compression.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 <stdlib.h>
#if defined(_MSC_VER)
#include <Windows.h>
#include <DbgHelp.h>
#pragma comment(lib, "dbghelp.lib")
// Windows.h conflicts with our COFF header definitions.
#ifdef IMAGE_FILE_MACHINE_I386
#undef IMAGE_FILE_MACHINE_I386
#endif
#endif
namespace llvm {
namespace symbolize {
ErrorOr<DILineInfo> LLVMSymbolizer::symbolizeCode(const std::string &ModuleName,
uint64_t ModuleOffset) {
auto InfoOrErr = getOrCreateModuleInfo(ModuleName);
if (auto EC = InfoOrErr.getError())
return EC;
SymbolizableModule *Info = InfoOrErr.get();
// 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 += Info->getModulePreferredBase();
DILineInfo LineInfo = Info->symbolizeCode(ModuleOffset, Opts.PrintFunctions,
Opts.UseSymbolTable);
if (Opts.Demangle)
LineInfo.FunctionName = DemangleName(LineInfo.FunctionName, Info);
return LineInfo;
}
ErrorOr<DIInliningInfo>
LLVMSymbolizer::symbolizeInlinedCode(const std::string &ModuleName,
uint64_t ModuleOffset) {
auto InfoOrErr = getOrCreateModuleInfo(ModuleName);
if (auto EC = InfoOrErr.getError())
return EC;
SymbolizableModule *Info = InfoOrErr.get();
// 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 += Info->getModulePreferredBase();
DIInliningInfo InlinedContext = Info->symbolizeInlinedCode(
ModuleOffset, 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;
}
ErrorOr<DIGlobal> LLVMSymbolizer::symbolizeData(const std::string &ModuleName,
uint64_t ModuleOffset) {
auto InfoOrErr = getOrCreateModuleInfo(ModuleName);
if (auto EC = InfoOrErr.getError())
return EC;
SymbolizableModule *Info = InfoOrErr.get();
// 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 += Info->getModulePreferredBase();
DIGlobal Global = Info->symbolizeData(ModuleOffset);
if (Opts.Demangle)
Global.Name = DemangleName(Global.Name, Info);
return Global;
}
void LLVMSymbolizer::flush() {
ObjectForUBPathAndArch.clear();
BinaryForPath.clear();
ObjectPairForPathArch.clear();
Modules.clear();
}
// 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.
static
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 ResourceName.str();
}
static bool checkFileCRC(StringRef Path, uint32_t CRCHash) {
ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
MemoryBuffer::getFileOrSTDIN(Path);
if (!MB)
return false;
return !zlib::isAvailable() || CRCHash == zlib::crc32(MB.get()->getBuffer());
}
static bool findDebugBinary(const std::string &OrigPath,
const std::string &DebuglinkName, uint32_t CRCHash,
std::string &Result) {
std::string OrigRealPath = OrigPath;
#if defined(HAVE_REALPATH)
if (char *RP = realpath(OrigPath.c_str(), nullptr)) {
OrigRealPath = RP;
free(RP);
}
#endif
SmallString<16> OrigDir(OrigRealPath);
llvm::sys::path::remove_filename(OrigDir);
SmallString<16> DebugPath = OrigDir;
// Try /path/to/original_binary/debuglink_name
llvm::sys::path::append(DebugPath, DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = DebugPath.str();
return true;
}
// Try /path/to/original_binary/.debug/debuglink_name
DebugPath = OrigRealPath;
llvm::sys::path::append(DebugPath, ".debug", DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = DebugPath.str();
return true;
}
// Try /usr/lib/debug/path/to/original_binary/debuglink_name
DebugPath = "/usr/lib/debug";
llvm::sys::path::append(DebugPath, llvm::sys::path::relative_path(OrigDir),
DebuglinkName);
if (checkFileCRC(DebugPath, CRCHash)) {
Result = DebugPath.str();
return true;
}
return false;
}
static bool getGNUDebuglinkContents(const ObjectFile *Obj, std::string &DebugName,
uint32_t &CRCHash) {
if (!Obj)
return false;
for (const SectionRef &Section : Obj->sections()) {
StringRef Name;
Section.getName(Name);
Name = Name.substr(Name.find_first_not_of("._"));
if (Name == "gnu_debuglink") {
StringRef Data;
Section.getContents(Data);
DataExtractor DE(Data, Obj->isLittleEndian(), 0);
uint32_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;
}
static
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());
}
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, Filename));
for (const auto &Path : Opts.DsymHints) {
DsymPaths.push_back(getDarwinDWARFResourceForPath(Path, Filename));
}
for (const auto &Path : DsymPaths) {
auto DbgObjOrErr = getOrCreateObject(Path, ArchName);
if (!DbgObjOrErr)
continue;
ObjectFile *DbgObj = DbgObjOrErr.get();
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)
return nullptr;
return DbgObjOrErr.get();
}
ErrorOr<LLVMSymbolizer::ObjectPair>
LLVMSymbolizer::getOrCreateObjectPair(const std::string &Path,
const std::string &ArchName) {
const auto &I = ObjectPairForPathArch.find(std::make_pair(Path, ArchName));
if (I != ObjectPairForPathArch.end())
return I->second;
auto ObjOrErr = getOrCreateObject(Path, ArchName);
if (auto EC = ObjOrErr.getError()) {
ObjectPairForPathArch.insert(
std::make_pair(std::make_pair(Path, ArchName), EC));
return EC;
}
ObjectFile *Obj = ObjOrErr.get();
assert(Obj != nullptr);
ObjectFile *DbgObj = nullptr;
if (auto MachObj = dyn_cast<const MachOObjectFile>(Obj))
DbgObj = lookUpDsymFile(Path, MachObj, ArchName);
if (!DbgObj)
DbgObj = lookUpDebuglinkObject(Path, Obj, ArchName);
if (!DbgObj)
DbgObj = Obj;
ObjectPair Res = std::make_pair(Obj, DbgObj);
ObjectPairForPathArch.insert(
std::make_pair(std::make_pair(Path, ArchName), Res));
return Res;
}
ErrorOr<ObjectFile *>
LLVMSymbolizer::getOrCreateObject(const std::string &Path,
const std::string &ArchName) {
const auto &I = BinaryForPath.find(Path);
Binary *Bin = nullptr;
if (I == BinaryForPath.end()) {
ErrorOr<OwningBinary<Binary>> BinOrErr = createBinary(Path);
if (auto EC = BinOrErr.getError()) {
BinaryForPath.insert(std::make_pair(Path, EC));
return EC;
}
Bin = BinOrErr->getBinary();
BinaryForPath.insert(std::make_pair(Path, std::move(BinOrErr.get())));
} else if (auto EC = I->second.getError()) {
return EC;
} else {
Bin = I->second->getBinary();
}
assert(Bin != nullptr);
if (MachOUniversalBinary *UB = dyn_cast<MachOUniversalBinary>(Bin)) {
const auto &I = ObjectForUBPathAndArch.find(std::make_pair(Path, ArchName));
if (I != ObjectForUBPathAndArch.end()) {
if (auto EC = I->second.getError())
return EC;
return I->second->get();
}
ErrorOr<std::unique_ptr<ObjectFile>> ObjOrErr =
UB->getObjectForArch(ArchName);
if (auto EC = ObjOrErr.getError()) {
ObjectForUBPathAndArch.insert(
std::make_pair(std::make_pair(Path, ArchName), EC));
return EC;
}
ObjectFile *Res = ObjOrErr->get();
ObjectForUBPathAndArch.insert(std::make_pair(std::make_pair(Path, ArchName),
std::move(ObjOrErr.get())));
return Res;
}
if (Bin->isObject()) {
return cast<ObjectFile>(Bin);
}
return object_error::arch_not_found;
}
ErrorOr<SymbolizableModule *>
LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName) {
const auto &I = Modules.find(ModuleName);
if (I != Modules.end()) {
auto &InfoOrErr = I->second;
if (auto EC = InfoOrErr.getError())
return EC;
return InfoOrErr->get();
}
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 ObjectsOrErr = getOrCreateObjectPair(BinaryName, ArchName);
if (auto EC = ObjectsOrErr.getError()) {
// Failed to find valid object file.
Modules.insert(std::make_pair(ModuleName, EC));
return EC;
}
ObjectPair Objects = ObjectsOrErr.get();
std::unique_ptr<DIContext> Context;
if (auto CoffObject = dyn_cast<COFFObjectFile>(Objects.first)) {
// If this is a COFF object, assume it contains PDB debug information. If
// we don't find any we will fall back to the DWARF case.
std::unique_ptr<IPDBSession> Session;
PDB_ErrorCode Error = loadDataForEXE(PDB_ReaderType::DIA,
Objects.first->getFileName(), Session);
if (Error == PDB_ErrorCode::Success) {
Context.reset(new PDBContext(*CoffObject, std::move(Session)));
}
}
if (!Context)
Context.reset(new DWARFContextInMemory(*Objects.second));
assert(Context);
auto InfoOrErr =
SymbolizableObjectFile::create(Objects.first, std::move(Context));
auto InsertResult =
Modules.insert(std::make_pair(ModuleName, std::move(InfoOrErr)));
assert(InsertResult.second);
if (auto EC = InsertResult.first->second.getError())
return EC;
return InsertResult.first->second->get();
}
// 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'.
static 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 &&
std::all_of(SymbolName.begin() + AtPos + 1, SymbolName.end(),
[](char C) { return C >= '0' && C <= '9'; })) {
SymbolName = SymbolName.substr(0, AtPos);
}
}
// Remove any ending '@' for vectorcall.
if (SymbolName.endswith("@"))
SymbolName = SymbolName.drop_back();
return SymbolName;
}
#if !defined(_MSC_VER)
// Assume that __cxa_demangle is provided by libcxxabi (except for Windows).
extern "C" char *__cxa_demangle(const char *mangled_name, char *output_buffer,
size_t *length, int *status);
#endif
std::string LLVMSymbolizer::DemangleName(const std::string &Name,
const SymbolizableModule *ModInfo) {
#if !defined(_MSC_VER)
// We can spoil names of symbols with C linkage, so use an heuristic
// approach to check if the name should be demangled.
if (Name.substr(0, 2) == "_Z") {
int status = 0;
char *DemangledName = __cxa_demangle(Name.c_str(), nullptr, nullptr, &status);
if (status != 0)
return Name;
std::string Result = DemangledName;
free(DemangledName);
return Result;
}
#else
if (!Name.empty() && Name.front() == '?') {
// Only do MSVC C++ demangling on symbols starting with '?'.
char DemangledName[1024] = {0};
DWORD result = ::UnDecorateSymbolName(
Name.c_str(), DemangledName, 1023,
UNDNAME_NO_ACCESS_SPECIFIERS | // Strip public, private, protected
UNDNAME_NO_ALLOCATION_LANGUAGE | // Strip __thiscall, __stdcall, etc
UNDNAME_NO_THROW_SIGNATURES | // Strip throw() specifications
UNDNAME_NO_MEMBER_TYPE | // Strip virtual, static, etc specifiers
UNDNAME_NO_MS_KEYWORDS | // Strip all MS extension keywords
UNDNAME_NO_FUNCTION_RETURNS); // Strip function return types
return (result == 0) ? Name : std::string(DemangledName);
}
#endif
if (ModInfo && ModInfo->isWin32Module())
return std::string(demanglePE32ExternCFunc(Name));
return Name;
}
} // namespace symbolize
} // namespace llvm
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