LLVM  3.7.0
DWARFDebugFrame.cpp
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1 //===-- DWARFDebugFrame.h - Parsing of .debug_frame -------------*- C++ -*-===//
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/ArrayRef.h"
12 #include "llvm/ADT/DenseMap.h"
13 #include "llvm/ADT/SmallString.h"
14 #include "llvm/Support/Casting.h"
15 #include "llvm/Support/DataTypes.h"
16 #include "llvm/Support/Dwarf.h"
18 #include "llvm/Support/Format.h"
20 #include <string>
21 #include <vector>
22 
23 using namespace llvm;
24 using namespace dwarf;
25 
26 
27 /// \brief Abstract frame entry defining the common interface concrete
28 /// entries implement.
30 public:
31  enum FrameKind {FK_CIE, FK_FDE};
32  FrameEntry(FrameKind K, uint64_t Offset, uint64_t Length)
33  : Kind(K), Offset(Offset), Length(Length) {}
34 
35  virtual ~FrameEntry() {
36  }
37 
38  FrameKind getKind() const { return Kind; }
39  virtual uint64_t getOffset() const { return Offset; }
40 
41  /// \brief Parse and store a sequence of CFI instructions from Data,
42  /// starting at *Offset and ending at EndOffset. If everything
43  /// goes well, *Offset should be equal to EndOffset when this method
44  /// returns. Otherwise, an error occurred.
45  virtual void parseInstructions(DataExtractor Data, uint32_t *Offset,
46  uint32_t EndOffset);
47 
48  /// \brief Dump the entry header to the given output stream.
49  virtual void dumpHeader(raw_ostream &OS) const = 0;
50 
51  /// \brief Dump the entry's instructions to the given output stream.
52  virtual void dumpInstructions(raw_ostream &OS) const;
53 
54 protected:
55  const FrameKind Kind;
56 
57  /// \brief Offset of this entry in the section.
58  uint64_t Offset;
59 
60  /// \brief Entry length as specified in DWARF.
61  uint64_t Length;
62 
63  /// An entry may contain CFI instructions. An instruction consists of an
64  /// opcode and an optional sequence of operands.
65  typedef std::vector<uint64_t> Operands;
66  struct Instruction {
67  Instruction(uint8_t Opcode)
68  : Opcode(Opcode)
69  {}
70 
71  uint8_t Opcode;
73  };
74 
75  std::vector<Instruction> Instructions;
76 
77  /// Convenience methods to add a new instruction with the given opcode and
78  /// operands to the Instructions vector.
79  void addInstruction(uint8_t Opcode) {
80  Instructions.push_back(Instruction(Opcode));
81  }
82 
83  void addInstruction(uint8_t Opcode, uint64_t Operand1) {
84  Instructions.push_back(Instruction(Opcode));
85  Instructions.back().Ops.push_back(Operand1);
86  }
87 
88  void addInstruction(uint8_t Opcode, uint64_t Operand1, uint64_t Operand2) {
89  Instructions.push_back(Instruction(Opcode));
90  Instructions.back().Ops.push_back(Operand1);
91  Instructions.back().Ops.push_back(Operand2);
92  }
93 };
94 
95 
96 // See DWARF standard v3, section 7.23
97 const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK = 0xc0;
98 const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK = 0x3f;
99 
100 void FrameEntry::parseInstructions(DataExtractor Data, uint32_t *Offset,
101  uint32_t EndOffset) {
102  while (*Offset < EndOffset) {
103  uint8_t Opcode = Data.getU8(Offset);
104  // Some instructions have a primary opcode encoded in the top bits.
105  uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK;
106 
107  if (Primary) {
108  // If it's a primary opcode, the first operand is encoded in the bottom
109  // bits of the opcode itself.
110  uint64_t Op1 = Opcode & DWARF_CFI_PRIMARY_OPERAND_MASK;
111  switch (Primary) {
112  default: llvm_unreachable("Impossible primary CFI opcode");
113  case DW_CFA_advance_loc:
114  case DW_CFA_restore:
115  addInstruction(Primary, Op1);
116  break;
117  case DW_CFA_offset:
118  addInstruction(Primary, Op1, Data.getULEB128(Offset));
119  break;
120  }
121  } else {
122  // Extended opcode - its value is Opcode itself.
123  switch (Opcode) {
124  default: llvm_unreachable("Invalid extended CFI opcode");
125  case DW_CFA_nop:
129  // No operands
130  addInstruction(Opcode);
131  break;
132  case DW_CFA_set_loc:
133  // Operands: Address
134  addInstruction(Opcode, Data.getAddress(Offset));
135  break;
136  case DW_CFA_advance_loc1:
137  // Operands: 1-byte delta
138  addInstruction(Opcode, Data.getU8(Offset));
139  break;
140  case DW_CFA_advance_loc2:
141  // Operands: 2-byte delta
142  addInstruction(Opcode, Data.getU16(Offset));
143  break;
144  case DW_CFA_advance_loc4:
145  // Operands: 4-byte delta
146  addInstruction(Opcode, Data.getU32(Offset));
147  break;
149  case DW_CFA_undefined:
150  case DW_CFA_same_value:
153  // Operands: ULEB128
154  addInstruction(Opcode, Data.getULEB128(Offset));
155  break;
157  // Operands: SLEB128
158  addInstruction(Opcode, Data.getSLEB128(Offset));
159  break;
161  case DW_CFA_register:
162  case DW_CFA_def_cfa:
163  case DW_CFA_val_offset:
164  // Operands: ULEB128, ULEB128
165  addInstruction(Opcode, Data.getULEB128(Offset),
166  Data.getULEB128(Offset));
167  break;
169  case DW_CFA_def_cfa_sf:
171  // Operands: ULEB128, SLEB128
172  addInstruction(Opcode, Data.getULEB128(Offset),
173  Data.getSLEB128(Offset));
174  break;
176  case DW_CFA_expression:
178  // TODO: implement this
179  report_fatal_error("Values with expressions not implemented yet!");
180  }
181  }
182  }
183 }
184 
185 namespace {
186 /// \brief DWARF Common Information Entry (CIE)
187 class CIE : public FrameEntry {
188 public:
189  // CIEs (and FDEs) are simply container classes, so the only sensible way to
190  // create them is by providing the full parsed contents in the constructor.
191  CIE(uint64_t Offset, uint64_t Length, uint8_t Version,
192  SmallString<8> Augmentation, uint8_t AddressSize,
193  uint8_t SegmentDescriptorSize, uint64_t CodeAlignmentFactor,
194  int64_t DataAlignmentFactor, uint64_t ReturnAddressRegister)
195  : FrameEntry(FK_CIE, Offset, Length), Version(Version),
196  Augmentation(std::move(Augmentation)),
197  AddressSize(AddressSize),
198  SegmentDescriptorSize(SegmentDescriptorSize),
199  CodeAlignmentFactor(CodeAlignmentFactor),
200  DataAlignmentFactor(DataAlignmentFactor),
201  ReturnAddressRegister(ReturnAddressRegister) {}
202 
203  ~CIE() override {}
204 
205  uint64_t getCodeAlignmentFactor() const { return CodeAlignmentFactor; }
206  int64_t getDataAlignmentFactor() const { return DataAlignmentFactor; }
207 
208  void dumpHeader(raw_ostream &OS) const override {
209  OS << format("%08x %08x %08x CIE",
210  (uint32_t)Offset, (uint32_t)Length, DW_CIE_ID)
211  << "\n";
212  OS << format(" Version: %d\n", Version);
213  OS << " Augmentation: \"" << Augmentation << "\"\n";
214  if (Version >= 4) {
215  OS << format(" Address size: %u\n",
216  (uint32_t)AddressSize);
217  OS << format(" Segment desc size: %u\n",
218  (uint32_t)SegmentDescriptorSize);
219  }
220  OS << format(" Code alignment factor: %u\n",
221  (uint32_t)CodeAlignmentFactor);
222  OS << format(" Data alignment factor: %d\n",
223  (int32_t)DataAlignmentFactor);
224  OS << format(" Return address column: %d\n",
225  (int32_t)ReturnAddressRegister);
226  OS << "\n";
227  }
228 
229  static bool classof(const FrameEntry *FE) {
230  return FE->getKind() == FK_CIE;
231  }
232 
233 private:
234  /// The following fields are defined in section 6.4.1 of the DWARF standard v4
235  uint8_t Version;
236  SmallString<8> Augmentation;
237  uint8_t AddressSize;
238  uint8_t SegmentDescriptorSize;
239  uint64_t CodeAlignmentFactor;
240  int64_t DataAlignmentFactor;
241  uint64_t ReturnAddressRegister;
242 };
243 
244 
245 /// \brief DWARF Frame Description Entry (FDE)
246 class FDE : public FrameEntry {
247 public:
248  // Each FDE has a CIE it's "linked to". Our FDE contains is constructed with
249  // an offset to the CIE (provided by parsing the FDE header). The CIE itself
250  // is obtained lazily once it's actually required.
251  FDE(uint64_t Offset, uint64_t Length, int64_t LinkedCIEOffset,
252  uint64_t InitialLocation, uint64_t AddressRange,
253  CIE *Cie)
254  : FrameEntry(FK_FDE, Offset, Length), LinkedCIEOffset(LinkedCIEOffset),
255  InitialLocation(InitialLocation), AddressRange(AddressRange),
256  LinkedCIE(Cie) {}
257 
258  ~FDE() override {}
259 
260  CIE *getLinkedCIE() const { return LinkedCIE; }
261 
262  void dumpHeader(raw_ostream &OS) const override {
263  OS << format("%08x %08x %08x FDE ",
264  (uint32_t)Offset, (uint32_t)Length, (int32_t)LinkedCIEOffset);
265  OS << format("cie=%08x pc=%08x...%08x\n",
266  (int32_t)LinkedCIEOffset,
267  (uint32_t)InitialLocation,
268  (uint32_t)InitialLocation + (uint32_t)AddressRange);
269  }
270 
271  static bool classof(const FrameEntry *FE) {
272  return FE->getKind() == FK_FDE;
273  }
274 
275 private:
276  /// The following fields are defined in section 6.4.1 of the DWARF standard v3
277  uint64_t LinkedCIEOffset;
278  uint64_t InitialLocation;
279  uint64_t AddressRange;
280  CIE *LinkedCIE;
281 };
282 
283 /// \brief Types of operands to CF instructions.
285  OT_Unset,
286  OT_None,
287  OT_Address,
288  OT_Offset,
289  OT_FactoredCodeOffset,
290  OT_SignedFactDataOffset,
291  OT_UnsignedFactDataOffset,
292  OT_Register,
293  OT_Expression
294 };
295 
296 } // end anonymous namespace
297 
298 /// \brief Initialize the array describing the types of operands.
300  static OperandType OpTypes[DW_CFA_restore+1][2];
301 
302 #define DECLARE_OP2(OP, OPTYPE0, OPTYPE1) \
303  do { \
304  OpTypes[OP][0] = OPTYPE0; \
305  OpTypes[OP][1] = OPTYPE1; \
306  } while (0)
307 #define DECLARE_OP1(OP, OPTYPE0) DECLARE_OP2(OP, OPTYPE0, OT_None)
308 #define DECLARE_OP0(OP) DECLARE_OP1(OP, OT_None)
309 
310  DECLARE_OP1(DW_CFA_set_loc, OT_Address);
311  DECLARE_OP1(DW_CFA_advance_loc, OT_FactoredCodeOffset);
312  DECLARE_OP1(DW_CFA_advance_loc1, OT_FactoredCodeOffset);
313  DECLARE_OP1(DW_CFA_advance_loc2, OT_FactoredCodeOffset);
314  DECLARE_OP1(DW_CFA_advance_loc4, OT_FactoredCodeOffset);
315  DECLARE_OP1(DW_CFA_MIPS_advance_loc8, OT_FactoredCodeOffset);
316  DECLARE_OP2(DW_CFA_def_cfa, OT_Register, OT_Offset);
317  DECLARE_OP2(DW_CFA_def_cfa_sf, OT_Register, OT_SignedFactDataOffset);
318  DECLARE_OP1(DW_CFA_def_cfa_register, OT_Register);
320  DECLARE_OP1(DW_CFA_def_cfa_offset_sf, OT_SignedFactDataOffset);
321  DECLARE_OP1(DW_CFA_def_cfa_expression, OT_Expression);
322  DECLARE_OP1(DW_CFA_undefined, OT_Register);
323  DECLARE_OP1(DW_CFA_same_value, OT_Register);
324  DECLARE_OP2(DW_CFA_offset, OT_Register, OT_UnsignedFactDataOffset);
325  DECLARE_OP2(DW_CFA_offset_extended, OT_Register, OT_UnsignedFactDataOffset);
326  DECLARE_OP2(DW_CFA_offset_extended_sf, OT_Register, OT_SignedFactDataOffset);
327  DECLARE_OP2(DW_CFA_val_offset, OT_Register, OT_UnsignedFactDataOffset);
328  DECLARE_OP2(DW_CFA_val_offset_sf, OT_Register, OT_SignedFactDataOffset);
329  DECLARE_OP2(DW_CFA_register, OT_Register, OT_Register);
330  DECLARE_OP2(DW_CFA_expression, OT_Register, OT_Expression);
331  DECLARE_OP2(DW_CFA_val_expression, OT_Register, OT_Expression);
332  DECLARE_OP1(DW_CFA_restore, OT_Register);
333  DECLARE_OP1(DW_CFA_restore_extended, OT_Register);
337  DECLARE_OP1(DW_CFA_GNU_args_size, OT_Offset);
339 
340 #undef DECLARE_OP0
341 #undef DECLARE_OP1
342 #undef DECLARE_OP2
343  return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1);
344 }
345 
347 
348 /// \brief Print \p Opcode's operand number \p OperandIdx which has
349 /// value \p Operand.
350 static void printOperand(raw_ostream &OS, uint8_t Opcode, unsigned OperandIdx,
351  uint64_t Operand, uint64_t CodeAlignmentFactor,
352  int64_t DataAlignmentFactor) {
353  assert(OperandIdx < 2);
354  OperandType Type = OpTypes[Opcode][OperandIdx];
355 
356  switch (Type) {
357  case OT_Unset:
358  OS << " Unsupported " << (OperandIdx ? "second" : "first") << " operand to";
359  if (const char *OpcodeName = CallFrameString(Opcode))
360  OS << " " << OpcodeName;
361  else
362  OS << format(" Opcode %x", Opcode);
363  break;
364  case OT_None:
365  break;
366  case OT_Address:
367  OS << format(" %" PRIx64, Operand);
368  break;
369  case OT_Offset:
370  // The offsets are all encoded in a unsigned form, but in practice
371  // consumers use them signed. It's most certainly legacy due to
372  // the lack of signed variants in the first Dwarf standards.
373  OS << format(" %+" PRId64, int64_t(Operand));
374  break;
375  case OT_FactoredCodeOffset: // Always Unsigned
376  if (CodeAlignmentFactor)
377  OS << format(" %" PRId64, Operand * CodeAlignmentFactor);
378  else
379  OS << format(" %" PRId64 "*code_alignment_factor" , Operand);
380  break;
381  case OT_SignedFactDataOffset:
382  if (DataAlignmentFactor)
383  OS << format(" %" PRId64, int64_t(Operand) * DataAlignmentFactor);
384  else
385  OS << format(" %" PRId64 "*data_alignment_factor" , int64_t(Operand));
386  break;
387  case OT_UnsignedFactDataOffset:
388  if (DataAlignmentFactor)
389  OS << format(" %" PRId64, Operand * DataAlignmentFactor);
390  else
391  OS << format(" %" PRId64 "*data_alignment_factor" , Operand);
392  break;
393  case OT_Register:
394  OS << format(" reg%" PRId64, Operand);
395  break;
396  case OT_Expression:
397  OS << " expression";
398  break;
399  }
400 }
401 
403  uint64_t CodeAlignmentFactor = 0;
404  int64_t DataAlignmentFactor = 0;
405  const CIE *Cie = dyn_cast<CIE>(this);
406 
407  if (!Cie)
408  Cie = cast<FDE>(this)->getLinkedCIE();
409  if (Cie) {
410  CodeAlignmentFactor = Cie->getCodeAlignmentFactor();
411  DataAlignmentFactor = Cie->getDataAlignmentFactor();
412  }
413 
414  for (const auto &Instr : Instructions) {
415  uint8_t Opcode = Instr.Opcode;
416  if (Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK)
418  OS << " " << CallFrameString(Opcode) << ":";
419  for (unsigned i = 0; i < Instr.Ops.size(); ++i)
420  printOperand(OS, Opcode, i, Instr.Ops[i], CodeAlignmentFactor,
421  DataAlignmentFactor);
422  OS << '\n';
423  }
424 }
425 
427 }
428 
430 }
431 
433  uint32_t Offset, int Length) {
434  errs() << "DUMP: ";
435  for (int i = 0; i < Length; ++i) {
436  uint8_t c = Data.getU8(&Offset);
437  errs().write_hex(c); errs() << " ";
438  }
439  errs() << "\n";
440 }
441 
442 
444  uint32_t Offset = 0;
446 
447  while (Data.isValidOffset(Offset)) {
448  uint32_t StartOffset = Offset;
449 
450  bool IsDWARF64 = false;
451  uint64_t Length = Data.getU32(&Offset);
452  uint64_t Id;
453 
454  if (Length == UINT32_MAX) {
455  // DWARF-64 is distinguished by the first 32 bits of the initial length
456  // field being 0xffffffff. Then, the next 64 bits are the actual entry
457  // length.
458  IsDWARF64 = true;
459  Length = Data.getU64(&Offset);
460  }
461 
462  // At this point, Offset points to the next field after Length.
463  // Length is the structure size excluding itself. Compute an offset one
464  // past the end of the structure (needed to know how many instructions to
465  // read).
466  // TODO: For honest DWARF64 support, DataExtractor will have to treat
467  // offset_ptr as uint64_t*
468  uint32_t EndStructureOffset = Offset + static_cast<uint32_t>(Length);
469 
470  // The Id field's size depends on the DWARF format
471  Id = Data.getUnsigned(&Offset, IsDWARF64 ? 8 : 4);
472  bool IsCIE = ((IsDWARF64 && Id == DW64_CIE_ID) || Id == DW_CIE_ID);
473 
474  if (IsCIE) {
475  uint8_t Version = Data.getU8(&Offset);
476  const char *Augmentation = Data.getCStr(&Offset);
477  uint8_t AddressSize = Version < 4 ? Data.getAddressSize() : Data.getU8(&Offset);
478  Data.setAddressSize(AddressSize);
479  uint8_t SegmentDescriptorSize = Version < 4 ? 0 : Data.getU8(&Offset);
480  uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset);
481  int64_t DataAlignmentFactor = Data.getSLEB128(&Offset);
482  uint64_t ReturnAddressRegister = Data.getULEB128(&Offset);
483 
484  auto Cie = make_unique<CIE>(StartOffset, Length, Version,
485  StringRef(Augmentation), AddressSize,
486  SegmentDescriptorSize, CodeAlignmentFactor,
487  DataAlignmentFactor, ReturnAddressRegister);
488  CIEs[StartOffset] = Cie.get();
489  Entries.emplace_back(std::move(Cie));
490  } else {
491  // FDE
492  uint64_t CIEPointer = Id;
493  uint64_t InitialLocation = Data.getAddress(&Offset);
494  uint64_t AddressRange = Data.getAddress(&Offset);
495 
496  Entries.emplace_back(new FDE(StartOffset, Length, CIEPointer,
497  InitialLocation, AddressRange,
498  CIEs[CIEPointer]));
499  }
500 
501  Entries.back()->parseInstructions(Data, &Offset, EndStructureOffset);
502 
503  if (Offset != EndStructureOffset) {
504  std::string Str;
505  raw_string_ostream OS(Str);
506  OS << format("Parsing entry instructions at %lx failed", StartOffset);
507  report_fatal_error(Str);
508  }
509  }
510 }
511 
512 
514  OS << "\n";
515  for (const auto &Entry : Entries) {
516  Entry->dumpHeader(OS);
517  Entry->dumpInstructions(OS);
518  OS << "\n";
519  }
520 }
521 
static int getDataAlignmentFactor(MCStreamer &streamer)
Definition: MCDwarf.cpp:944
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
static ArrayRef< OperandType[2]> OpTypes
uint8_t getAddressSize() const
Get the address size for this extractor.
Definition: DataExtractor.h:35
uint64_t Offset
Offset of this entry in the section.
const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK
bool isValidOffset(uint32_t offset) const
Test the validity of offset.
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(const char *reason, bool gen_crash_diag=true)
Reports a serious error, calling any installed error handler.
uint64_t Length
Entry length as specified in DWARF.
FrameEntry(FrameKind K, uint64_t Offset, uint64_t Length)
uint32_t getU32(uint32_t *offset_ptr) const
Extract a uint32_t value from *offset_ptr.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Definition: ErrorHandling.h:98
virtual void dumpInstructions(raw_ostream &OS) const
Dump the entry's instructions to the given output stream.
static void printOperand(raw_ostream &OS, uint8_t Opcode, unsigned OperandIdx, uint64_t Operand, uint64_t CodeAlignmentFactor, int64_t DataAlignmentFactor)
Print Opcode's operand number OperandIdx which has value Operand.
FrameKind getKind() const
raw_ostream & write_hex(unsigned long long N)
Output N in hexadecimal, without any prefix or padding.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: ArrayRef.h:31
#define DECLARE_OP2(OP, OPTYPE0, OPTYPE1)
format_object< Ts...> format(const char *Fmt, const Ts &...Vals)
These are helper functions used to produce formatted output.
Definition: Format.h:111
const FrameKind Kind
const char * getCStr(uint32_t *offset_ptr) const
Extract a C string from *offset_ptr.
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:45
uint8_t getU8(uint32_t *offset_ptr) const
Extract a uint8_t value from *offset_ptr.
#define LLVM_ATTRIBUTE_UNUSED
Definition: Compiler.h:142
void addInstruction(uint8_t Opcode, uint64_t Operand1)
uint64_t getULEB128(uint32_t *offset_ptr) const
Extract a unsigned LEB128 value from *offset_ptr.
uint64_t getU64(uint32_t *offset_ptr) const
Extract a uint64_t value from *offset_ptr.
const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK
virtual void parseInstructions(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...
const uint32_t DW_CIE_ID
Definition: Dwarf.h:53
std::vector< uint64_t > Operands
An entry may contain CFI instructions.
void addInstruction(uint8_t Opcode)
Convenience methods to add a new instruction with the given opcode and operands to the Instructions v...
#define DECLARE_OP0(OP)
std::vector< Instruction > Instructions
uint16_t getU16(uint32_t *offset_ptr) const
Extract a uint16_t value from *offset_ptr.
void setAddressSize(uint8_t Size)
Set the address size for this extractor.
Definition: DataExtractor.h:37
uint64_t getAddress(uint32_t *offset_ptr) const
Extract an pointer from *offset_ptr.
LLVM_ATTRIBUTE_UNUSED_RESULT 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:285
const char * CallFrameString(unsigned Encoding)
Definition: Dwarf.cpp:449
#define DECLARE_OP1(OP, OPTYPE0)
static ArrayRef< OperandType[2]> getOperandTypes()
Initialize the array describing the types of operands.
OperandType
Types of operands to CF instructions.
void parse(DataExtractor Data)
Parse the section from raw data.
virtual uint64_t getOffset() const
const ARM::ArchExtKind Kind
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:465
static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data, uint32_t Offset, int Length)
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:38
uint64_t getUnsigned(uint32_t *offset_ptr, uint32_t byte_size) const
Extract an unsigned integer of size byte_size from *offset_ptr.
int64_t getSLEB128(uint32_t *offset_ptr) const
Extract a signed LEB128 value from *offset_ptr.
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:40
void addInstruction(uint8_t Opcode, uint64_t Operand1, uint64_t Operand2)
void dump(raw_ostream &OS) const
Dump the section data into the given stream.
const uint64_t DW64_CIE_ID
Definition: Dwarf.h:54
Abstract frame entry defining the common interface concrete entries implement.