LLVM  8.0.0svn
DWARFDebugFrame.cpp
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1 //===- DWARFDebugFrame.h - Parsing of .debug_frame ------------------------===//
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 
11 #include "llvm/ADT/DenseMap.h"
12 #include "llvm/ADT/Optional.h"
13 #include "llvm/ADT/StringExtras.h"
14 #include "llvm/ADT/StringRef.h"
16 #include "llvm/Support/Casting.h"
17 #include "llvm/Support/Compiler.h"
19 #include "llvm/Support/Errc.h"
21 #include "llvm/Support/Format.h"
23 #include <algorithm>
24 #include <cassert>
25 #include <cinttypes>
26 #include <cstdint>
27 #include <string>
28 #include <vector>
29 
30 using namespace llvm;
31 using namespace dwarf;
32 
33 
34 // See DWARF standard v3, section 7.23
35 const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK = 0xc0;
36 const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK = 0x3f;
37 
39  uint32_t EndOffset) {
40  while (*Offset < EndOffset) {
41  uint8_t Opcode = Data.getU8(Offset);
42  // Some instructions have a primary opcode encoded in the top bits.
43  uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK;
44 
45  if (Primary) {
46  // If it's a primary opcode, the first operand is encoded in the bottom
47  // bits of the opcode itself.
48  uint64_t Op1 = Opcode & DWARF_CFI_PRIMARY_OPERAND_MASK;
49  switch (Primary) {
50  default:
52  "Invalid primary CFI opcode 0x%" PRIx8,
53  Primary);
54  case DW_CFA_advance_loc:
55  case DW_CFA_restore:
56  addInstruction(Primary, Op1);
57  break;
58  case DW_CFA_offset:
59  addInstruction(Primary, Op1, Data.getULEB128(Offset));
60  break;
61  }
62  } else {
63  // Extended opcode - its value is Opcode itself.
64  switch (Opcode) {
65  default:
67  "Invalid extended CFI opcode 0x%" PRIx8,
68  Opcode);
69  case DW_CFA_nop:
70  case DW_CFA_remember_state:
71  case DW_CFA_restore_state:
72  case DW_CFA_GNU_window_save:
73  // No operands
74  addInstruction(Opcode);
75  break;
76  case DW_CFA_set_loc:
77  // Operands: Address
78  addInstruction(Opcode, Data.getAddress(Offset));
79  break;
80  case DW_CFA_advance_loc1:
81  // Operands: 1-byte delta
82  addInstruction(Opcode, Data.getU8(Offset));
83  break;
84  case DW_CFA_advance_loc2:
85  // Operands: 2-byte delta
86  addInstruction(Opcode, Data.getU16(Offset));
87  break;
88  case DW_CFA_advance_loc4:
89  // Operands: 4-byte delta
90  addInstruction(Opcode, Data.getU32(Offset));
91  break;
92  case DW_CFA_restore_extended:
93  case DW_CFA_undefined:
94  case DW_CFA_same_value:
95  case DW_CFA_def_cfa_register:
96  case DW_CFA_def_cfa_offset:
97  case DW_CFA_GNU_args_size:
98  // Operands: ULEB128
99  addInstruction(Opcode, Data.getULEB128(Offset));
100  break;
101  case DW_CFA_def_cfa_offset_sf:
102  // Operands: SLEB128
103  addInstruction(Opcode, Data.getSLEB128(Offset));
104  break;
105  case DW_CFA_offset_extended:
106  case DW_CFA_register:
107  case DW_CFA_def_cfa:
108  case DW_CFA_val_offset: {
109  // Operands: ULEB128, ULEB128
110  // Note: We can not embed getULEB128 directly into function
111  // argument list. getULEB128 changes Offset and order of evaluation
112  // for arguments is unspecified.
113  auto op1 = Data.getULEB128(Offset);
114  auto op2 = Data.getULEB128(Offset);
115  addInstruction(Opcode, op1, op2);
116  break;
117  }
118  case DW_CFA_offset_extended_sf:
119  case DW_CFA_def_cfa_sf:
120  case DW_CFA_val_offset_sf: {
121  // Operands: ULEB128, SLEB128
122  // Note: see comment for the previous case
123  auto op1 = Data.getULEB128(Offset);
124  auto op2 = (uint64_t)Data.getSLEB128(Offset);
125  addInstruction(Opcode, op1, op2);
126  break;
127  }
128  case DW_CFA_def_cfa_expression: {
129  uint32_t ExprLength = Data.getULEB128(Offset);
130  addInstruction(Opcode, 0);
131  DataExtractor Extractor(
132  Data.getData().slice(*Offset, *Offset + ExprLength),
133  Data.isLittleEndian(), Data.getAddressSize());
134  Instructions.back().Expression = DWARFExpression(
135  Extractor, Data.getAddressSize(), dwarf::DWARF_VERSION);
136  *Offset += ExprLength;
137  break;
138  }
139  case DW_CFA_expression:
140  case DW_CFA_val_expression: {
141  auto RegNum = Data.getULEB128(Offset);
142  auto BlockLength = Data.getULEB128(Offset);
143  addInstruction(Opcode, RegNum, 0);
144  DataExtractor Extractor(
145  Data.getData().slice(*Offset, *Offset + BlockLength),
146  Data.isLittleEndian(), Data.getAddressSize());
147  Instructions.back().Expression = DWARFExpression(
148  Extractor, Data.getAddressSize(), dwarf::DWARF_VERSION);
149  *Offset += BlockLength;
150  break;
151  }
152  }
153  }
154  }
155 
156  return Error::success();
157 }
158 
159 namespace {
160 
161 
162 } // end anonymous namespace
163 
164 ArrayRef<CFIProgram::OperandType[2]> CFIProgram::getOperandTypes() {
165  static OperandType OpTypes[DW_CFA_restore+1][2];
166  static bool Initialized = false;
167  if (Initialized) {
168  return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1);
169  }
170  Initialized = true;
171 
172 #define DECLARE_OP2(OP, OPTYPE0, OPTYPE1) \
173  do { \
174  OpTypes[OP][0] = OPTYPE0; \
175  OpTypes[OP][1] = OPTYPE1; \
176  } while (false)
177 #define DECLARE_OP1(OP, OPTYPE0) DECLARE_OP2(OP, OPTYPE0, OT_None)
178 #define DECLARE_OP0(OP) DECLARE_OP1(OP, OT_None)
179 
180  DECLARE_OP1(DW_CFA_set_loc, OT_Address);
181  DECLARE_OP1(DW_CFA_advance_loc, OT_FactoredCodeOffset);
182  DECLARE_OP1(DW_CFA_advance_loc1, OT_FactoredCodeOffset);
183  DECLARE_OP1(DW_CFA_advance_loc2, OT_FactoredCodeOffset);
184  DECLARE_OP1(DW_CFA_advance_loc4, OT_FactoredCodeOffset);
185  DECLARE_OP1(DW_CFA_MIPS_advance_loc8, OT_FactoredCodeOffset);
186  DECLARE_OP2(DW_CFA_def_cfa, OT_Register, OT_Offset);
187  DECLARE_OP2(DW_CFA_def_cfa_sf, OT_Register, OT_SignedFactDataOffset);
188  DECLARE_OP1(DW_CFA_def_cfa_register, OT_Register);
189  DECLARE_OP1(DW_CFA_def_cfa_offset, OT_Offset);
190  DECLARE_OP1(DW_CFA_def_cfa_offset_sf, OT_SignedFactDataOffset);
191  DECLARE_OP1(DW_CFA_def_cfa_expression, OT_Expression);
192  DECLARE_OP1(DW_CFA_undefined, OT_Register);
193  DECLARE_OP1(DW_CFA_same_value, OT_Register);
194  DECLARE_OP2(DW_CFA_offset, OT_Register, OT_UnsignedFactDataOffset);
195  DECLARE_OP2(DW_CFA_offset_extended, OT_Register, OT_UnsignedFactDataOffset);
196  DECLARE_OP2(DW_CFA_offset_extended_sf, OT_Register, OT_SignedFactDataOffset);
197  DECLARE_OP2(DW_CFA_val_offset, OT_Register, OT_UnsignedFactDataOffset);
198  DECLARE_OP2(DW_CFA_val_offset_sf, OT_Register, OT_SignedFactDataOffset);
199  DECLARE_OP2(DW_CFA_register, OT_Register, OT_Register);
200  DECLARE_OP2(DW_CFA_expression, OT_Register, OT_Expression);
201  DECLARE_OP2(DW_CFA_val_expression, OT_Register, OT_Expression);
202  DECLARE_OP1(DW_CFA_restore, OT_Register);
203  DECLARE_OP1(DW_CFA_restore_extended, OT_Register);
204  DECLARE_OP0(DW_CFA_remember_state);
205  DECLARE_OP0(DW_CFA_restore_state);
206  DECLARE_OP0(DW_CFA_GNU_window_save);
207  DECLARE_OP1(DW_CFA_GNU_args_size, OT_Offset);
208  DECLARE_OP0(DW_CFA_nop);
209 
210 #undef DECLARE_OP0
211 #undef DECLARE_OP1
212 #undef DECLARE_OP2
213 
214  return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1);
215 }
216 
217 /// Print \p Opcode's operand number \p OperandIdx which has value \p Operand.
218 void CFIProgram::printOperand(raw_ostream &OS, const MCRegisterInfo *MRI,
219  bool IsEH, const Instruction &Instr,
220  unsigned OperandIdx, uint64_t Operand) const {
221  assert(OperandIdx < 2);
222  uint8_t Opcode = Instr.Opcode;
223  OperandType Type = getOperandTypes()[Opcode][OperandIdx];
224 
225  switch (Type) {
226  case OT_Unset: {
227  OS << " Unsupported " << (OperandIdx ? "second" : "first") << " operand to";
228  auto OpcodeName = CallFrameString(Opcode);
229  if (!OpcodeName.empty())
230  OS << " " << OpcodeName;
231  else
232  OS << format(" Opcode %x", Opcode);
233  break;
234  }
235  case OT_None:
236  break;
237  case OT_Address:
238  OS << format(" %" PRIx64, Operand);
239  break;
240  case OT_Offset:
241  // The offsets are all encoded in a unsigned form, but in practice
242  // consumers use them signed. It's most certainly legacy due to
243  // the lack of signed variants in the first Dwarf standards.
244  OS << format(" %+" PRId64, int64_t(Operand));
245  break;
246  case OT_FactoredCodeOffset: // Always Unsigned
247  if (CodeAlignmentFactor)
248  OS << format(" %" PRId64, Operand * CodeAlignmentFactor);
249  else
250  OS << format(" %" PRId64 "*code_alignment_factor" , Operand);
251  break;
252  case OT_SignedFactDataOffset:
253  if (DataAlignmentFactor)
254  OS << format(" %" PRId64, int64_t(Operand) * DataAlignmentFactor);
255  else
256  OS << format(" %" PRId64 "*data_alignment_factor" , int64_t(Operand));
257  break;
258  case OT_UnsignedFactDataOffset:
259  if (DataAlignmentFactor)
260  OS << format(" %" PRId64, Operand * DataAlignmentFactor);
261  else
262  OS << format(" %" PRId64 "*data_alignment_factor" , Operand);
263  break;
264  case OT_Register:
265  OS << format(" reg%" PRId64, Operand);
266  break;
267  case OT_Expression:
268  assert(Instr.Expression && "missing DWARFExpression object");
269  OS << " ";
270  Instr.Expression->print(OS, MRI, IsEH);
271  break;
272  }
273 }
274 
275 void CFIProgram::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH,
276  unsigned IndentLevel) const {
277  for (const auto &Instr : Instructions) {
278  uint8_t Opcode = Instr.Opcode;
279  if (Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK)
281  OS.indent(2 * IndentLevel);
282  OS << CallFrameString(Opcode) << ":";
283  for (unsigned i = 0; i < Instr.Ops.size(); ++i)
284  printOperand(OS, MRI, IsEH, Instr, i, Instr.Ops[i]);
285  OS << '\n';
286  }
287 }
288 
289 void CIE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const {
290  OS << format("%08x %08x %08x CIE", (uint32_t)Offset, (uint32_t)Length,
291  DW_CIE_ID)
292  << "\n";
293  OS << format(" Version: %d\n", Version);
294  OS << " Augmentation: \"" << Augmentation << "\"\n";
295  if (Version >= 4) {
296  OS << format(" Address size: %u\n", (uint32_t)AddressSize);
297  OS << format(" Segment desc size: %u\n",
298  (uint32_t)SegmentDescriptorSize);
299  }
300  OS << format(" Code alignment factor: %u\n", (uint32_t)CodeAlignmentFactor);
301  OS << format(" Data alignment factor: %d\n", (int32_t)DataAlignmentFactor);
302  OS << format(" Return address column: %d\n", (int32_t)ReturnAddressRegister);
303  if (Personality)
304  OS << format(" Personality Address: %08x\n", *Personality);
305  if (!AugmentationData.empty()) {
306  OS << " Augmentation data: ";
307  for (uint8_t Byte : AugmentationData)
308  OS << ' ' << hexdigit(Byte >> 4) << hexdigit(Byte & 0xf);
309  OS << "\n";
310  }
311  OS << "\n";
312  CFIs.dump(OS, MRI, IsEH);
313  OS << "\n";
314 }
315 
316 void FDE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const {
317  OS << format("%08x %08x %08x FDE ", (uint32_t)Offset, (uint32_t)Length,
318  (int32_t)LinkedCIEOffset);
319  OS << format("cie=%08x pc=%08x...%08x\n", (int32_t)LinkedCIEOffset,
320  (uint32_t)InitialLocation,
321  (uint32_t)InitialLocation + (uint32_t)AddressRange);
322  if (LSDAAddress)
323  OS << format(" LSDA Address: %08x\n", *LSDAAddress);
324  CFIs.dump(OS, MRI, IsEH);
325  OS << "\n";
326 }
327 
328 DWARFDebugFrame::DWARFDebugFrame(bool IsEH, uint64_t EHFrameAddress)
329  : IsEH(IsEH), EHFrameAddress(EHFrameAddress) {}
330 
332 
334  uint32_t Offset, int Length) {
335  errs() << "DUMP: ";
336  for (int i = 0; i < Length; ++i) {
337  uint8_t c = Data.getU8(&Offset);
338  errs().write_hex(c); errs() << " ";
339  }
340  errs() << "\n";
341 }
342 
343 // This is a workaround for old compilers which do not allow
344 // noreturn attribute usage in lambdas. Once the support for those
345 // compilers are phased out, we can remove this and return back to
346 // a ReportError lambda: [StartOffset](const char *ErrorMsg).
348  const char *ErrorMsg) {
349  std::string Str;
350  raw_string_ostream OS(Str);
351  OS << format(ErrorMsg, StartOffset);
352  OS.flush();
353  report_fatal_error(Str);
354 }
355 
357  uint32_t Offset = 0;
359 
360  while (Data.isValidOffset(Offset)) {
361  uint32_t StartOffset = Offset;
362 
363  bool IsDWARF64 = false;
364  uint64_t Length = Data.getU32(&Offset);
365  uint64_t Id;
366 
367  if (Length == UINT32_MAX) {
368  // DWARF-64 is distinguished by the first 32 bits of the initial length
369  // field being 0xffffffff. Then, the next 64 bits are the actual entry
370  // length.
371  IsDWARF64 = true;
372  Length = Data.getU64(&Offset);
373  }
374 
375  // At this point, Offset points to the next field after Length.
376  // Length is the structure size excluding itself. Compute an offset one
377  // past the end of the structure (needed to know how many instructions to
378  // read).
379  // TODO: For honest DWARF64 support, DataExtractor will have to treat
380  // offset_ptr as uint64_t*
381  uint32_t StartStructureOffset = Offset;
382  uint32_t EndStructureOffset = Offset + static_cast<uint32_t>(Length);
383 
384  // The Id field's size depends on the DWARF format
385  Id = Data.getUnsigned(&Offset, (IsDWARF64 && !IsEH) ? 8 : 4);
386  bool IsCIE =
387  ((IsDWARF64 && Id == DW64_CIE_ID) || Id == DW_CIE_ID || (IsEH && !Id));
388 
389  if (IsCIE) {
390  uint8_t Version = Data.getU8(&Offset);
391  const char *Augmentation = Data.getCStr(&Offset);
392  StringRef AugmentationString(Augmentation ? Augmentation : "");
393  uint8_t AddressSize = Version < 4 ? Data.getAddressSize() :
394  Data.getU8(&Offset);
395  Data.setAddressSize(AddressSize);
396  uint8_t SegmentDescriptorSize = Version < 4 ? 0 : Data.getU8(&Offset);
397  uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset);
398  int64_t DataAlignmentFactor = Data.getSLEB128(&Offset);
399  uint64_t ReturnAddressRegister = Data.getULEB128(&Offset);
400 
401  // Parse the augmentation data for EH CIEs
402  StringRef AugmentationData("");
403  uint32_t FDEPointerEncoding = DW_EH_PE_absptr;
404  uint32_t LSDAPointerEncoding = DW_EH_PE_omit;
405  Optional<uint64_t> Personality;
406  Optional<uint32_t> PersonalityEncoding;
407  if (IsEH) {
408  Optional<uint64_t> AugmentationLength;
409  uint32_t StartAugmentationOffset;
410  uint32_t EndAugmentationOffset;
411 
412  // Walk the augmentation string to get all the augmentation data.
413  for (unsigned i = 0, e = AugmentationString.size(); i != e; ++i) {
414  switch (AugmentationString[i]) {
415  default:
416  ReportError(StartOffset,
417  "Unknown augmentation character in entry at %lx");
418  case 'L':
419  LSDAPointerEncoding = Data.getU8(&Offset);
420  break;
421  case 'P': {
422  if (Personality)
423  ReportError(StartOffset,
424  "Duplicate personality in entry at %lx");
425  PersonalityEncoding = Data.getU8(&Offset);
426  Personality = Data.getEncodedPointer(
427  &Offset, *PersonalityEncoding,
428  EHFrameAddress ? EHFrameAddress + Offset : 0);
429  break;
430  }
431  case 'R':
432  FDEPointerEncoding = Data.getU8(&Offset);
433  break;
434  case 'S':
435  // Current frame is a signal trampoline.
436  break;
437  case 'z':
438  if (i)
439  ReportError(StartOffset,
440  "'z' must be the first character at %lx");
441  // Parse the augmentation length first. We only parse it if
442  // the string contains a 'z'.
443  AugmentationLength = Data.getULEB128(&Offset);
444  StartAugmentationOffset = Offset;
445  EndAugmentationOffset = Offset +
446  static_cast<uint32_t>(*AugmentationLength);
447  }
448  }
449 
450  if (AugmentationLength.hasValue()) {
451  if (Offset != EndAugmentationOffset)
452  ReportError(StartOffset, "Parsing augmentation data at %lx failed");
453 
454  AugmentationData = Data.getData().slice(StartAugmentationOffset,
455  EndAugmentationOffset);
456  }
457  }
458 
459  auto Cie = llvm::make_unique<CIE>(
460  StartOffset, Length, Version, AugmentationString, AddressSize,
461  SegmentDescriptorSize, CodeAlignmentFactor, DataAlignmentFactor,
462  ReturnAddressRegister, AugmentationData, FDEPointerEncoding,
463  LSDAPointerEncoding, Personality, PersonalityEncoding);
464  CIEs[StartOffset] = Cie.get();
465  Entries.emplace_back(std::move(Cie));
466  } else {
467  // FDE
468  uint64_t CIEPointer = Id;
469  uint64_t InitialLocation = 0;
470  uint64_t AddressRange = 0;
471  Optional<uint64_t> LSDAAddress;
472  CIE *Cie = CIEs[IsEH ? (StartStructureOffset - CIEPointer) : CIEPointer];
473 
474  if (IsEH) {
475  // The address size is encoded in the CIE we reference.
476  if (!Cie)
477  ReportError(StartOffset,
478  "Parsing FDE data at %lx failed due to missing CIE");
479 
480  if (auto Val = Data.getEncodedPointer(
481  &Offset, Cie->getFDEPointerEncoding(),
482  EHFrameAddress ? EHFrameAddress + Offset : 0)) {
483  InitialLocation = *Val;
484  }
485  if (auto Val = Data.getEncodedPointer(
486  &Offset, Cie->getFDEPointerEncoding(), 0)) {
487  AddressRange = *Val;
488  }
489 
490  StringRef AugmentationString = Cie->getAugmentationString();
491  if (!AugmentationString.empty()) {
492  // Parse the augmentation length and data for this FDE.
493  uint64_t AugmentationLength = Data.getULEB128(&Offset);
494 
495  uint32_t EndAugmentationOffset =
496  Offset + static_cast<uint32_t>(AugmentationLength);
497 
498  // Decode the LSDA if the CIE augmentation string said we should.
499  if (Cie->getLSDAPointerEncoding() != DW_EH_PE_omit) {
500  LSDAAddress = Data.getEncodedPointer(
501  &Offset, Cie->getLSDAPointerEncoding(),
502  EHFrameAddress ? Offset + EHFrameAddress : 0);
503  }
504 
505  if (Offset != EndAugmentationOffset)
506  ReportError(StartOffset, "Parsing augmentation data at %lx failed");
507  }
508  } else {
509  InitialLocation = Data.getAddress(&Offset);
510  AddressRange = Data.getAddress(&Offset);
511  }
512 
513  Entries.emplace_back(new FDE(StartOffset, Length, CIEPointer,
514  InitialLocation, AddressRange,
515  Cie, LSDAAddress));
516  }
517 
518  if (Error E =
519  Entries.back()->cfis().parse(Data, &Offset, EndStructureOffset)) {
520  report_fatal_error(toString(std::move(E)));
521  }
522 
523  if (Offset != EndStructureOffset)
524  ReportError(StartOffset, "Parsing entry instructions at %lx failed");
525  }
526 }
527 
528 FrameEntry *DWARFDebugFrame::getEntryAtOffset(uint64_t Offset) const {
529  auto It =
530  std::lower_bound(Entries.begin(), Entries.end(), Offset,
531  [](const std::unique_ptr<FrameEntry> &E,
532  uint64_t Offset) { return E->getOffset() < Offset; });
533  if (It != Entries.end() && (*It)->getOffset() == Offset)
534  return It->get();
535  return nullptr;
536 }
537 
539  Optional<uint64_t> Offset) const {
540  if (Offset) {
541  if (auto *Entry = getEntryAtOffset(*Offset))
542  Entry->dump(OS, MRI, IsEH);
543  return;
544  }
545 
546  OS << "\n";
547  for (const auto &Entry : Entries)
548  Entry->dump(OS, MRI, IsEH);
549 }
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
uint64_t getULEB128(uint32_t *offset_ptr) const
Extract a unsigned LEB128 value from *offset_ptr.
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:139
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:138
Error parse(DataExtractor Data, uint32_t *Offset, uint32_t EndOffset)
Parse and store a sequence of CFI instructions from Data, starting at *Offset and ending at EndOffset...
An entry in either debug_frame or eh_frame.
format_object< Ts... > format(const char *Fmt, const Ts &... Vals)
These are helper functions used to produce formatted output.
Definition: Format.h:124
raw_ostream & indent(unsigned NumSpaces)
indent - Insert &#39;NumSpaces&#39; spaces.
StringRef getData() const
Get the data pointed to by this extractor.
Definition: DataExtractor.h:55
const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK
uint32_t getLSDAPointerEncoding() const
uint16_t getU16(uint32_t *offset_ptr) const
Extract a uint16_t value from *offset_ptr.
std::string toString(Error E)
Write all error messages (if any) in E to a string.
Definition: Error.h:963
uint32_t getU32(uint32_t *offset_ptr) const
Extract a uint32_t value from *offset_ptr.
raw_ostream & write_hex(unsigned long long N)
Output N in hexadecimal, without any prefix or padding.
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE bool empty() const
empty - Check if the string is empty.
Definition: StringRef.h:133
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:33
auto lower_bound(R &&Range, ForwardIt I) -> decltype(adl_begin(Range))
Provide wrappers to std::lower_bound which take ranges instead of having to pass begin/end explicitly...
Definition: STLExtras.h:1138
#define DECLARE_OP2(OP, OPTYPE0, OPTYPE1)
bool isLittleEndian() const
Get the endianness for this extractor.
Definition: DataExtractor.h:57
char hexdigit(unsigned X, bool LowerCase=false)
hexdigit - Return the hexadecimal character for the given number X (which should be less than 16)...
Definition: StringExtras.h:37
int64_t getSLEB128(uint32_t *offset_ptr) const
Extract a signed LEB128 value from *offset_ptr.
void dump(raw_ostream &OS, const MCRegisterInfo *MRI, Optional< uint64_t > Offset) const
Dump the section data into the given stream.
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
unsigned const MachineRegisterInfo * MRI
DWARF Frame Description Entry (FDE)
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
StringRef CallFrameString(unsigned Encoding)
Definition: Dwarf.cpp:458
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
uint32_t getFDEPointerEncoding() const
uint8_t getAddressSize() const
Get the address size for this extractor.
Definition: DataExtractor.h:59
uint8_t getU8(uint32_t *offset_ptr) const
Extract a uint8_t value from *offset_ptr.
uint64_t getAddress(uint32_t *offset_ptr) const
Extract an pointer from *offset_ptr.
void dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH, unsigned IndentLevel=1) const
uint64_t getU64(uint32_t *offset_ptr) const
Extract a uint64_t value from *offset_ptr.
size_t size() const
Definition: SmallVector.h:53
const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK
Optional< uint64_t > getEncodedPointer(uint32_t *Offset, uint8_t Encoding, uint64_t AbsPosOffset=0) const
Extracts a DWARF-encoded pointer in Offset using Encoding.
void dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const override
Dump the instructions in this CFI fragment.
const uint32_t DW_CIE_ID
Special ID values that distinguish a CIE from a FDE in DWARF CFI.
Definition: Dwarf.h:70
A DataExtractor (typically for an in-memory copy of an object-file section) plus a relocation map for...
static ErrorSuccess success()
Create a success value.
Definition: Error.h:327
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE StringRef slice(size_t Start, size_t End) const
Return a reference to the substring from [Start, End).
Definition: StringRef.h:710
#define DECLARE_OP0(OP)
void dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const override
Dump the instructions in this CFI fragment.
DWARF Common Information Entry (CIE)
void setAddressSize(uint8_t Size)
Set the address size for this extractor.
Definition: DataExtractor.h:61
This file contains constants used for implementing Dwarf debug support.
DWARFDebugFrame(bool IsEH=false, uint64_t EHFrameAddress=0)
#define DECLARE_OP1(OP, OPTYPE0)
#define LLVM_ATTRIBUTE_NORETURN
Definition: Compiler.h:222
StringRef getAugmentationString() const
bool hasValue() const
Definition: Optional.h:183
uint64_t getUnsigned(uint32_t *offset_ptr, uint32_t byte_size) const
Extract an unsigned integer of size byte_size from *offset_ptr.
An instruction consists of a DWARF CFI opcode and an optional sequence of operands.
const char * getCStr(uint32_t *offset_ptr) const
Extract a C string from *offset_ptr.
bool isValidOffset(uint32_t offset) const
Test the validity of offset.
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:483
static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data, uint32_t Offset, int Length)
Lightweight error class with error context and mandatory checking.
Definition: Error.h:158
Optional< DWARFExpression > Expression
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
#define LLVM_ATTRIBUTE_UNUSED
Definition: Compiler.h:160
void parse(DWARFDataExtractor Data)
Parse the section from raw data.
static void LLVM_ATTRIBUTE_NORETURN ReportError(uint32_t StartOffset, const char *ErrorMsg)
const uint64_t Version
Definition: InstrProf.h:895
Error createStringError(std::error_code EC, char const *Fmt, const Ts &... Vals)
Create formatted StringError object.
Definition: Error.h:1158
const uint64_t DW64_CIE_ID
Definition: Dwarf.h:71