LLVM  8.0.0svn
Symbolize.cpp
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1 //===-- LLVMSymbolize.cpp -------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Implementation for LLVM symbolization library.
11 //
12 //===----------------------------------------------------------------------===//
13 
15 
16 #include "SymbolizableObjectFile.h"
17 
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/BinaryFormat/COFF.h"
20 #include "llvm/Config/config.h"
22 #include "llvm/DebugInfo/PDB/PDB.h"
24 #include "llvm/Demangle/Demangle.h"
25 #include "llvm/Object/COFF.h"
26 #include "llvm/Object/MachO.h"
28 #include "llvm/Support/Casting.h"
31 #include "llvm/Support/Errc.h"
34 #include "llvm/Support/Path.h"
35 #include <algorithm>
36 #include <cassert>
37 #include <cstdlib>
38 #include <cstring>
39 
40 #if defined(_MSC_VER)
41 #include <Windows.h>
42 
43 // This must be included after windows.h.
44 #include <DbgHelp.h>
45 #pragma comment(lib, "dbghelp.lib")
46 
47 // Windows.h conflicts with our COFF header definitions.
48 #ifdef IMAGE_FILE_MACHINE_I386
49 #undef IMAGE_FILE_MACHINE_I386
50 #endif
51 #endif
52 
53 namespace llvm {
54 namespace symbolize {
55 
56 Expected<DILineInfo>
57 LLVMSymbolizer::symbolizeCode(const std::string &ModuleName,
58  uint64_t ModuleOffset, StringRef DWPName) {
59  SymbolizableModule *Info;
60  if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName, DWPName))
61  Info = InfoOrErr.get();
62  else
63  return InfoOrErr.takeError();
64 
65  // A null module means an error has already been reported. Return an empty
66  // result.
67  if (!Info)
68  return DILineInfo();
69 
70  // If the user is giving us relative addresses, add the preferred base of the
71  // object to the offset before we do the query. It's what DIContext expects.
72  if (Opts.RelativeAddresses)
73  ModuleOffset += Info->getModulePreferredBase();
74 
75  DILineInfo LineInfo = Info->symbolizeCode(ModuleOffset, Opts.PrintFunctions,
76  Opts.UseSymbolTable);
77  if (Opts.Demangle)
78  LineInfo.FunctionName = DemangleName(LineInfo.FunctionName, Info);
79  return LineInfo;
80 }
81 
83 LLVMSymbolizer::symbolizeInlinedCode(const std::string &ModuleName,
84  uint64_t ModuleOffset, StringRef DWPName) {
85  SymbolizableModule *Info;
86  if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName, DWPName))
87  Info = InfoOrErr.get();
88  else
89  return InfoOrErr.takeError();
90 
91  // A null module means an error has already been reported. Return an empty
92  // result.
93  if (!Info)
94  return DIInliningInfo();
95 
96  // If the user is giving us relative addresses, add the preferred base of the
97  // object to the offset before we do the query. It's what DIContext expects.
98  if (Opts.RelativeAddresses)
99  ModuleOffset += Info->getModulePreferredBase();
100 
101  DIInliningInfo InlinedContext = Info->symbolizeInlinedCode(
102  ModuleOffset, Opts.PrintFunctions, Opts.UseSymbolTable);
103  if (Opts.Demangle) {
104  for (int i = 0, n = InlinedContext.getNumberOfFrames(); i < n; i++) {
105  auto *Frame = InlinedContext.getMutableFrame(i);
106  Frame->FunctionName = DemangleName(Frame->FunctionName, Info);
107  }
108  }
109  return InlinedContext;
110 }
111 
112 Expected<DIGlobal> LLVMSymbolizer::symbolizeData(const std::string &ModuleName,
113  uint64_t ModuleOffset) {
114  SymbolizableModule *Info;
115  if (auto InfoOrErr = getOrCreateModuleInfo(ModuleName))
116  Info = InfoOrErr.get();
117  else
118  return InfoOrErr.takeError();
119 
120  // A null module means an error has already been reported. Return an empty
121  // result.
122  if (!Info)
123  return DIGlobal();
124 
125  // If the user is giving us relative addresses, add the preferred base of
126  // the object to the offset before we do the query. It's what DIContext
127  // expects.
128  if (Opts.RelativeAddresses)
129  ModuleOffset += Info->getModulePreferredBase();
130 
131  DIGlobal Global = Info->symbolizeData(ModuleOffset);
132  if (Opts.Demangle)
133  Global.Name = DemangleName(Global.Name, Info);
134  return Global;
135 }
136 
138  ObjectForUBPathAndArch.clear();
139  BinaryForPath.clear();
140  ObjectPairForPathArch.clear();
141  Modules.clear();
142 }
143 
144 namespace {
145 
146 // For Path="/path/to/foo" and Basename="foo" assume that debug info is in
147 // /path/to/foo.dSYM/Contents/Resources/DWARF/foo.
148 // For Path="/path/to/bar.dSYM" and Basename="foo" assume that debug info is in
149 // /path/to/bar.dSYM/Contents/Resources/DWARF/foo.
150 std::string getDarwinDWARFResourceForPath(
151  const std::string &Path, const std::string &Basename) {
152  SmallString<16> ResourceName = StringRef(Path);
153  if (sys::path::extension(Path) != ".dSYM") {
154  ResourceName += ".dSYM";
155  }
156  sys::path::append(ResourceName, "Contents", "Resources", "DWARF");
157  sys::path::append(ResourceName, Basename);
158  return ResourceName.str();
159 }
160 
161 bool checkFileCRC(StringRef Path, uint32_t CRCHash) {
164  if (!MB)
165  return false;
166  return !zlib::isAvailable() || CRCHash == zlib::crc32(MB.get()->getBuffer());
167 }
168 
169 bool findDebugBinary(const std::string &OrigPath,
170  const std::string &DebuglinkName, uint32_t CRCHash,
171  std::string &Result) {
172  std::string OrigRealPath = OrigPath;
173 #if defined(HAVE_REALPATH)
174  if (char *RP = realpath(OrigPath.c_str(), nullptr)) {
175  OrigRealPath = RP;
176  free(RP);
177  }
178 #endif
179  SmallString<16> OrigDir(OrigRealPath);
181  SmallString<16> DebugPath = OrigDir;
182  // Try /path/to/original_binary/debuglink_name
183  llvm::sys::path::append(DebugPath, DebuglinkName);
184  if (checkFileCRC(DebugPath, CRCHash)) {
185  Result = DebugPath.str();
186  return true;
187  }
188  // Try /path/to/original_binary/.debug/debuglink_name
189  DebugPath = OrigDir;
190  llvm::sys::path::append(DebugPath, ".debug", DebuglinkName);
191  if (checkFileCRC(DebugPath, CRCHash)) {
192  Result = DebugPath.str();
193  return true;
194  }
195 #if defined(__NetBSD__)
196  // Try /usr/libdata/debug/path/to/original_binary/debuglink_name
197  DebugPath = "/usr/libdata/debug";
198 #else
199  // Try /usr/lib/debug/path/to/original_binary/debuglink_name
200  DebugPath = "/usr/lib/debug";
201 #endif
203  DebuglinkName);
204  if (checkFileCRC(DebugPath, CRCHash)) {
205  Result = DebugPath.str();
206  return true;
207  }
208  return false;
209 }
210 
211 bool getGNUDebuglinkContents(const ObjectFile *Obj, std::string &DebugName,
212  uint32_t &CRCHash) {
213  if (!Obj)
214  return false;
215  for (const SectionRef &Section : Obj->sections()) {
216  StringRef Name;
217  Section.getName(Name);
218  Name = Name.substr(Name.find_first_not_of("._"));
219  if (Name == "gnu_debuglink") {
220  StringRef Data;
221  Section.getContents(Data);
222  DataExtractor DE(Data, Obj->isLittleEndian(), 0);
223  uint32_t Offset = 0;
224  if (const char *DebugNameStr = DE.getCStr(&Offset)) {
225  // 4-byte align the offset.
226  Offset = (Offset + 3) & ~0x3;
227  if (DE.isValidOffsetForDataOfSize(Offset, 4)) {
228  DebugName = DebugNameStr;
229  CRCHash = DE.getU32(&Offset);
230  return true;
231  }
232  }
233  break;
234  }
235  }
236  return false;
237 }
238 
239 bool darwinDsymMatchesBinary(const MachOObjectFile *DbgObj,
240  const MachOObjectFile *Obj) {
241  ArrayRef<uint8_t> dbg_uuid = DbgObj->getUuid();
242  ArrayRef<uint8_t> bin_uuid = Obj->getUuid();
243  if (dbg_uuid.empty() || bin_uuid.empty())
244  return false;
245  return !memcmp(dbg_uuid.data(), bin_uuid.data(), dbg_uuid.size());
246 }
247 
248 } // end anonymous namespace
249 
250 ObjectFile *LLVMSymbolizer::lookUpDsymFile(const std::string &ExePath,
251  const MachOObjectFile *MachExeObj, const std::string &ArchName) {
252  // On Darwin we may find DWARF in separate object file in
253  // resource directory.
254  std::vector<std::string> DsymPaths;
255  StringRef Filename = sys::path::filename(ExePath);
256  DsymPaths.push_back(getDarwinDWARFResourceForPath(ExePath, Filename));
257  for (const auto &Path : Opts.DsymHints) {
258  DsymPaths.push_back(getDarwinDWARFResourceForPath(Path, Filename));
259  }
260  for (const auto &Path : DsymPaths) {
261  auto DbgObjOrErr = getOrCreateObject(Path, ArchName);
262  if (!DbgObjOrErr) {
263  // Ignore errors, the file might not exist.
264  consumeError(DbgObjOrErr.takeError());
265  continue;
266  }
267  ObjectFile *DbgObj = DbgObjOrErr.get();
268  if (!DbgObj)
269  continue;
270  const MachOObjectFile *MachDbgObj = dyn_cast<const MachOObjectFile>(DbgObj);
271  if (!MachDbgObj)
272  continue;
273  if (darwinDsymMatchesBinary(MachDbgObj, MachExeObj))
274  return DbgObj;
275  }
276  return nullptr;
277 }
278 
279 ObjectFile *LLVMSymbolizer::lookUpDebuglinkObject(const std::string &Path,
280  const ObjectFile *Obj,
281  const std::string &ArchName) {
282  std::string DebuglinkName;
283  uint32_t CRCHash;
284  std::string DebugBinaryPath;
285  if (!getGNUDebuglinkContents(Obj, DebuglinkName, CRCHash))
286  return nullptr;
287  if (!findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath))
288  return nullptr;
289  auto DbgObjOrErr = getOrCreateObject(DebugBinaryPath, ArchName);
290  if (!DbgObjOrErr) {
291  // Ignore errors, the file might not exist.
292  consumeError(DbgObjOrErr.takeError());
293  return nullptr;
294  }
295  return DbgObjOrErr.get();
296 }
297 
299 LLVMSymbolizer::getOrCreateObjectPair(const std::string &Path,
300  const std::string &ArchName) {
301  const auto &I = ObjectPairForPathArch.find(std::make_pair(Path, ArchName));
302  if (I != ObjectPairForPathArch.end()) {
303  return I->second;
304  }
305 
306  auto ObjOrErr = getOrCreateObject(Path, ArchName);
307  if (!ObjOrErr) {
308  ObjectPairForPathArch.insert(std::make_pair(std::make_pair(Path, ArchName),
309  ObjectPair(nullptr, nullptr)));
310  return ObjOrErr.takeError();
311  }
312 
313  ObjectFile *Obj = ObjOrErr.get();
314  assert(Obj != nullptr);
315  ObjectFile *DbgObj = nullptr;
316 
317  if (auto MachObj = dyn_cast<const MachOObjectFile>(Obj))
318  DbgObj = lookUpDsymFile(Path, MachObj, ArchName);
319  if (!DbgObj)
320  DbgObj = lookUpDebuglinkObject(Path, Obj, ArchName);
321  if (!DbgObj)
322  DbgObj = Obj;
323  ObjectPair Res = std::make_pair(Obj, DbgObj);
324  ObjectPairForPathArch.insert(
325  std::make_pair(std::make_pair(Path, ArchName), Res));
326  return Res;
327 }
328 
330 LLVMSymbolizer::getOrCreateObject(const std::string &Path,
331  const std::string &ArchName) {
332  const auto &I = BinaryForPath.find(Path);
333  Binary *Bin = nullptr;
334  if (I == BinaryForPath.end()) {
336  if (!BinOrErr) {
337  BinaryForPath.insert(std::make_pair(Path, OwningBinary<Binary>()));
338  return BinOrErr.takeError();
339  }
340  Bin = BinOrErr->getBinary();
341  BinaryForPath.insert(std::make_pair(Path, std::move(BinOrErr.get())));
342  } else {
343  Bin = I->second.getBinary();
344  }
345 
346  if (!Bin)
347  return static_cast<ObjectFile *>(nullptr);
348 
349  if (MachOUniversalBinary *UB = dyn_cast_or_null<MachOUniversalBinary>(Bin)) {
350  const auto &I = ObjectForUBPathAndArch.find(std::make_pair(Path, ArchName));
351  if (I != ObjectForUBPathAndArch.end()) {
352  return I->second.get();
353  }
355  UB->getObjectForArch(ArchName);
356  if (!ObjOrErr) {
357  ObjectForUBPathAndArch.insert(std::make_pair(
358  std::make_pair(Path, ArchName), std::unique_ptr<ObjectFile>()));
359  return ObjOrErr.takeError();
360  }
361  ObjectFile *Res = ObjOrErr->get();
362  ObjectForUBPathAndArch.insert(std::make_pair(std::make_pair(Path, ArchName),
363  std::move(ObjOrErr.get())));
364  return Res;
365  }
366  if (Bin->isObject()) {
367  return cast<ObjectFile>(Bin);
368  }
369  return errorCodeToError(object_error::arch_not_found);
370 }
371 
373 LLVMSymbolizer::getOrCreateModuleInfo(const std::string &ModuleName,
374  StringRef DWPName) {
375  const auto &I = Modules.find(ModuleName);
376  if (I != Modules.end()) {
377  return I->second.get();
378  }
379  std::string BinaryName = ModuleName;
380  std::string ArchName = Opts.DefaultArch;
381  size_t ColonPos = ModuleName.find_last_of(':');
382  // Verify that substring after colon form a valid arch name.
383  if (ColonPos != std::string::npos) {
384  std::string ArchStr = ModuleName.substr(ColonPos + 1);
385  if (Triple(ArchStr).getArch() != Triple::UnknownArch) {
386  BinaryName = ModuleName.substr(0, ColonPos);
387  ArchName = ArchStr;
388  }
389  }
390  auto ObjectsOrErr = getOrCreateObjectPair(BinaryName, ArchName);
391  if (!ObjectsOrErr) {
392  // Failed to find valid object file.
393  Modules.insert(
394  std::make_pair(ModuleName, std::unique_ptr<SymbolizableModule>()));
395  return ObjectsOrErr.takeError();
396  }
397  ObjectPair Objects = ObjectsOrErr.get();
398 
399  std::unique_ptr<DIContext> Context;
400  // If this is a COFF object containing PDB info, use a PDBContext to
401  // symbolize. Otherwise, use DWARF.
402  if (auto CoffObject = dyn_cast<COFFObjectFile>(Objects.first)) {
403  const codeview::DebugInfo *DebugInfo;
404  StringRef PDBFileName;
405  auto EC = CoffObject->getDebugPDBInfo(DebugInfo, PDBFileName);
406  if (!EC && DebugInfo != nullptr && !PDBFileName.empty()) {
407  using namespace pdb;
408  std::unique_ptr<IPDBSession> Session;
409  if (auto Err = loadDataForEXE(PDB_ReaderType::DIA,
410  Objects.first->getFileName(), Session)) {
411  Modules.insert(
412  std::make_pair(ModuleName, std::unique_ptr<SymbolizableModule>()));
413  // Return along the PDB filename to provide more context
414  return createFileError(PDBFileName, std::move(Err));
415  }
416  Context.reset(new PDBContext(*CoffObject, std::move(Session)));
417  }
418  }
419  if (!Context)
420  Context = DWARFContext::create(*Objects.second, nullptr,
422  assert(Context);
423  auto InfoOrErr =
424  SymbolizableObjectFile::create(Objects.first, std::move(Context));
425  std::unique_ptr<SymbolizableModule> SymMod;
426  if (InfoOrErr)
427  SymMod = std::move(InfoOrErr.get());
428  auto InsertResult =
429  Modules.insert(std::make_pair(ModuleName, std::move(SymMod)));
430  assert(InsertResult.second);
431  if (auto EC = InfoOrErr.getError())
432  return errorCodeToError(EC);
433  return InsertResult.first->second.get();
434 }
435 
436 namespace {
437 
438 // Undo these various manglings for Win32 extern "C" functions:
439 // cdecl - _foo
440 // stdcall - _foo@12
441 // fastcall - @foo@12
442 // vectorcall - foo@@12
443 // These are all different linkage names for 'foo'.
444 StringRef demanglePE32ExternCFunc(StringRef SymbolName) {
445  // Remove any '_' or '@' prefix.
446  char Front = SymbolName.empty() ? '\0' : SymbolName[0];
447  if (Front == '_' || Front == '@')
448  SymbolName = SymbolName.drop_front();
449 
450  // Remove any '@[0-9]+' suffix.
451  if (Front != '?') {
452  size_t AtPos = SymbolName.rfind('@');
453  if (AtPos != StringRef::npos &&
454  std::all_of(SymbolName.begin() + AtPos + 1, SymbolName.end(),
455  [](char C) { return C >= '0' && C <= '9'; })) {
456  SymbolName = SymbolName.substr(0, AtPos);
457  }
458  }
459 
460  // Remove any ending '@' for vectorcall.
461  if (SymbolName.endswith("@"))
462  SymbolName = SymbolName.drop_back();
463 
464  return SymbolName;
465 }
466 
467 } // end anonymous namespace
468 
469 std::string
471  const SymbolizableModule *DbiModuleDescriptor) {
472  // We can spoil names of symbols with C linkage, so use an heuristic
473  // approach to check if the name should be demangled.
474  if (Name.substr(0, 2) == "_Z") {
475  int status = 0;
476  char *DemangledName = itaniumDemangle(Name.c_str(), nullptr, nullptr, &status);
477  if (status != 0)
478  return Name;
479  std::string Result = DemangledName;
480  free(DemangledName);
481  return Result;
482  }
483 
484 #if defined(_MSC_VER)
485  if (!Name.empty() && Name.front() == '?') {
486  // Only do MSVC C++ demangling on symbols starting with '?'.
487  char DemangledName[1024] = {0};
488  DWORD result = ::UnDecorateSymbolName(
489  Name.c_str(), DemangledName, 1023,
490  UNDNAME_NO_ACCESS_SPECIFIERS | // Strip public, private, protected
491  UNDNAME_NO_ALLOCATION_LANGUAGE | // Strip __thiscall, __stdcall, etc
492  UNDNAME_NO_THROW_SIGNATURES | // Strip throw() specifications
493  UNDNAME_NO_MEMBER_TYPE | // Strip virtual, static, etc specifiers
494  UNDNAME_NO_MS_KEYWORDS | // Strip all MS extension keywords
495  UNDNAME_NO_FUNCTION_RETURNS); // Strip function return types
496  return (result == 0) ? Name : std::string(DemangledName);
497  }
498 #endif
499  if (DbiModuleDescriptor && DbiModuleDescriptor->isWin32Module())
500  return std::string(demanglePE32ExternCFunc(Name));
501  return Name;
502 }
503 
504 } // namespace symbolize
505 } // namespace llvm
uint64_t CallInst * C
Represents either an error or a value T.
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Remove the last component from path unless it is the root dir.
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Definition: DIContext.h:89
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LLVMContext & Context
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Definition: AllocatorList.h:24
LLVM_NODISCARD size_t rfind(char C, size_t From=npos) const
Search for the last character C in the string.
Definition: StringRef.h:360
virtual DIGlobal symbolizeData(uint64_t ModuleOffset) const =0
This class is the base class for all object file types.
Definition: ObjectFile.h:190
virtual DILineInfo symbolizeCode(uint64_t ModuleOffset, FunctionNameKind FNKind, bool UseSymbolTable) const =0
bool all_of(R &&range, UnaryPredicate P)
Provide wrappers to std::all_of which take ranges instead of having to pass begin/end explicitly...
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Definition: Binary.cpp:45
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Check if this string ends with the given Suffix.
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Append to path.
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constexpr char SymbolName[]
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Explicit conversion to StringRef.
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Concatenate a source file path and/or name with an Error.
Definition: Error.h:1213
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empty - Check if the string is empty.
Definition: StringRef.h:133
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uint32_t getNumberOfFrames() const
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Return a reference to the substring from [Start, Start + N).
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bool isAvailable()
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Error loadDataForEXE(PDB_ReaderType Type, StringRef Path, std::unique_ptr< IPDBSession > &Session)
Definition: PDB.cpp:44
std::error_code status(const Twine &path, file_status &result, bool follow=true)
Get file status as if by POSIX stat().
size_t size() const
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Definition: ArrayRef.h:149
virtual DIInliningInfo symbolizeInlinedCode(uint64_t ModuleOffset, FunctionNameKind FNKind, bool UseSymbolTable) const =0
Error errorCodeToError(std::error_code EC)
Helper for converting an std::error_code to a Error.
Definition: Error.cpp:87
A format-neutral container for inlined code description.
Definition: DIContext.h:78
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Find the first character in the string that is not C or npos if not found.
Definition: StringRef.cpp:250
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Definition: Symbolize.h:44
static ErrorPolicy defaultErrorHandler(Error E)
Function used to handle default error reporting policy.
Expected< DILineInfo > symbolizeCode(const std::string &ModuleName, uint64_t ModuleOffset, StringRef DWPName="")
Definition: Symbolize.cpp:57
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Consume a Error without doing anything.
Definition: Error.h:982
bool isLittleEndian() const
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const T * data() const
Definition: ArrayRef.h:146
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
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Return a StringRef equal to &#39;this&#39; but with the last N elements dropped.
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Return a StringRef equal to &#39;this&#39; but with the first N elements dropped.
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Definition: DIContext.h:33
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bool isObject() const
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Definition: StringRef.h:106
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#define I(x, y, z)
Definition: MD5.cpp:58
LLVM_NODISCARD std::enable_if<!is_simple_type< Y >::value, typename cast_retty< X, const Y >::ret_type >::type dyn_cast(const Y &Val)
Definition: Casting.h:323
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
Expected< DIInliningInfo > symbolizeInlinedCode(const std::string &ModuleName, uint64_t ModuleOffset, StringRef DWPName="")
Definition: Symbolize.cpp:83
StringRef relative_path(StringRef path, Style style=Style::native)
Get relative path.
Definition: Path.cpp:437
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
static ErrorOr< std::unique_ptr< SymbolizableObjectFile > > create(object::ObjectFile *Obj, std::unique_ptr< DIContext > DICtx)
iterator end() const
Definition: StringRef.h:108
Expected< DIGlobal > symbolizeData(const std::string &ModuleName, uint64_t ModuleOffset)
Definition: Symbolize.cpp:112
reference get()
Definition: ErrorOr.h:157
Container for description of a global variable.
Definition: DIContext.h:104
bool empty() const
empty - Check if the array is empty.
Definition: ArrayRef.h:144
This is a value type class that represents a single section in the list of sections in the object fil...
Definition: ObjectFile.h:81
StringRef extension(StringRef path, Style style=Style::native)
Get extension.
Definition: Path.cpp:605