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DWARFCallFrameInfo.cpp
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1 //===-- DWARFCallFrameInfo.cpp --------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
10 #include "lldb/Core/Debugger.h"
11 #include "lldb/Core/Module.h"
12 #include "lldb/Core/Section.h"
13 #include "lldb/Core/dwarf.h"
14 #include "lldb/Host/Host.h"
15 #include "lldb/Symbol/ObjectFile.h"
16 #include "lldb/Symbol/UnwindPlan.h"
18 #include "lldb/Target/Thread.h"
19 #include "lldb/Utility/ArchSpec.h"
20 #include "lldb/Utility/LLDBLog.h"
21 #include "lldb/Utility/Log.h"
22 #include "lldb/Utility/Timer.h"
23 #include <cstring>
24 #include <list>
25 
26 using namespace lldb;
27 using namespace lldb_private;
28 using namespace lldb_private::dwarf;
29 
30 // GetDwarfEHPtr
31 //
32 // Used for calls when the value type is specified by a DWARF EH Frame pointer
33 // encoding.
34 static uint64_t
35 GetGNUEHPointer(const DataExtractor &DE, offset_t *offset_ptr,
36  uint32_t eh_ptr_enc, addr_t pc_rel_addr, addr_t text_addr,
37  addr_t data_addr) //, BSDRelocs *data_relocs) const
38 {
39  if (eh_ptr_enc == DW_EH_PE_omit)
40  return ULLONG_MAX; // Value isn't in the buffer...
41 
42  uint64_t baseAddress = 0;
43  uint64_t addressValue = 0;
44  const uint32_t addr_size = DE.GetAddressByteSize();
45  assert(addr_size == 4 || addr_size == 8);
46 
47  bool signExtendValue = false;
48  // Decode the base part or adjust our offset
49  switch (eh_ptr_enc & 0x70) {
50  case DW_EH_PE_pcrel:
51  signExtendValue = true;
52  baseAddress = *offset_ptr;
53  if (pc_rel_addr != LLDB_INVALID_ADDRESS)
54  baseAddress += pc_rel_addr;
55  // else
56  // Log::GlobalWarning ("PC relative pointer encoding found with
57  // invalid pc relative address.");
58  break;
59 
60  case DW_EH_PE_textrel:
61  signExtendValue = true;
62  if (text_addr != LLDB_INVALID_ADDRESS)
63  baseAddress = text_addr;
64  // else
65  // Log::GlobalWarning ("text relative pointer encoding being
66  // decoded with invalid text section address, setting base address
67  // to zero.");
68  break;
69 
70  case DW_EH_PE_datarel:
71  signExtendValue = true;
72  if (data_addr != LLDB_INVALID_ADDRESS)
73  baseAddress = data_addr;
74  // else
75  // Log::GlobalWarning ("data relative pointer encoding being
76  // decoded with invalid data section address, setting base address
77  // to zero.");
78  break;
79 
80  case DW_EH_PE_funcrel:
81  signExtendValue = true;
82  break;
83 
84  case DW_EH_PE_aligned: {
85  // SetPointerSize should be called prior to extracting these so the pointer
86  // size is cached
87  assert(addr_size != 0);
88  if (addr_size) {
89  // Align to a address size boundary first
90  uint32_t alignOffset = *offset_ptr % addr_size;
91  if (alignOffset)
92  offset_ptr += addr_size - alignOffset;
93  }
94  } break;
95 
96  default:
97  break;
98  }
99 
100  // Decode the value part
101  switch (eh_ptr_enc & DW_EH_PE_MASK_ENCODING) {
102  case DW_EH_PE_absptr: {
103  addressValue = DE.GetAddress(offset_ptr);
104  // if (data_relocs)
105  // addressValue = data_relocs->Relocate(*offset_ptr -
106  // addr_size, *this, addressValue);
107  } break;
108  case DW_EH_PE_uleb128:
109  addressValue = DE.GetULEB128(offset_ptr);
110  break;
111  case DW_EH_PE_udata2:
112  addressValue = DE.GetU16(offset_ptr);
113  break;
114  case DW_EH_PE_udata4:
115  addressValue = DE.GetU32(offset_ptr);
116  break;
117  case DW_EH_PE_udata8:
118  addressValue = DE.GetU64(offset_ptr);
119  break;
120  case DW_EH_PE_sleb128:
121  addressValue = DE.GetSLEB128(offset_ptr);
122  break;
123  case DW_EH_PE_sdata2:
124  addressValue = (int16_t)DE.GetU16(offset_ptr);
125  break;
126  case DW_EH_PE_sdata4:
127  addressValue = (int32_t)DE.GetU32(offset_ptr);
128  break;
129  case DW_EH_PE_sdata8:
130  addressValue = (int64_t)DE.GetU64(offset_ptr);
131  break;
132  default:
133  // Unhandled encoding type
134  assert(eh_ptr_enc);
135  break;
136  }
137 
138  // Since we promote everything to 64 bit, we may need to sign extend
139  if (signExtendValue && addr_size < sizeof(baseAddress)) {
140  uint64_t sign_bit = 1ull << ((addr_size * 8ull) - 1ull);
141  if (sign_bit & addressValue) {
142  uint64_t mask = ~sign_bit + 1;
143  addressValue |= mask;
144  }
145  }
146  return baseAddress + addressValue;
147 }
148 
149 DWARFCallFrameInfo::DWARFCallFrameInfo(ObjectFile &objfile,
150  SectionSP &section_sp, Type type)
151  : m_objfile(objfile), m_section_sp(section_sp), m_type(type) {}
152 
154  UnwindPlan &unwind_plan) {
155  return GetUnwindPlan(AddressRange(addr, 1), unwind_plan);
156 }
157 
159  UnwindPlan &unwind_plan) {
160  FDEEntryMap::Entry fde_entry;
161  Address addr = range.GetBaseAddress();
162 
163  // Make sure that the Address we're searching for is the same object file as
164  // this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
165  ModuleSP module_sp = addr.GetModule();
166  if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr ||
167  module_sp->GetObjectFile() != &m_objfile)
168  return false;
169 
170  if (llvm::Optional<FDEEntryMap::Entry> entry = GetFirstFDEEntryInRange(range))
171  return FDEToUnwindPlan(entry->data, addr, unwind_plan);
172  return false;
173 }
174 
176 
177  // Make sure that the Address we're searching for is the same object file as
178  // this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
179  ModuleSP module_sp = addr.GetModule();
180  if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr ||
181  module_sp->GetObjectFile() != &m_objfile)
182  return false;
183 
184  if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
185  return false;
186  GetFDEIndex();
187  FDEEntryMap::Entry *fde_entry =
189  if (!fde_entry)
190  return false;
191 
192  range = AddressRange(fde_entry->base, fde_entry->size,
194  return true;
195 }
196 
197 llvm::Optional<DWARFCallFrameInfo::FDEEntryMap::Entry>
199  if (!m_section_sp || m_section_sp->IsEncrypted())
200  return std::nullopt;
201 
202  GetFDEIndex();
203 
204  addr_t start_file_addr = range.GetBaseAddress().GetFileAddress();
205  const FDEEntryMap::Entry *fde =
207  if (fde && fde->DoesIntersect(
208  FDEEntryMap::Range(start_file_addr, range.GetByteSize())))
209  return *fde;
210 
211  return std::nullopt;
212 }
213 
215  FunctionAddressAndSizeVector &function_info) {
216  GetFDEIndex();
217  const size_t count = m_fde_index.GetSize();
218  function_info.Clear();
219  if (count > 0)
220  function_info.Reserve(count);
221  for (size_t i = 0; i < count; ++i) {
222  const FDEEntryMap::Entry *func_offset_data_entry =
224  if (func_offset_data_entry) {
225  FunctionAddressAndSizeVector::Entry function_offset_entry(
226  func_offset_data_entry->base, func_offset_data_entry->size);
227  function_info.Append(function_offset_entry);
228  }
229  }
230 }
231 
234  cie_map_t::iterator pos = m_cie_map.find(cie_offset);
235 
236  if (pos != m_cie_map.end()) {
237  // Parse and cache the CIE
238  if (pos->second == nullptr)
239  pos->second = ParseCIE(cie_offset);
240 
241  return pos->second.get();
242  }
243  return nullptr;
244 }
245 
248  CIESP cie_sp(new CIE(cie_offset));
249  lldb::offset_t offset = cie_offset;
251  GetCFIData();
252  uint32_t length = m_cfi_data.GetU32(&offset);
253  dw_offset_t cie_id, end_offset;
254  bool is_64bit = (length == UINT32_MAX);
255  if (is_64bit) {
256  length = m_cfi_data.GetU64(&offset);
257  cie_id = m_cfi_data.GetU64(&offset);
258  end_offset = cie_offset + length + 12;
259  } else {
260  cie_id = m_cfi_data.GetU32(&offset);
261  end_offset = cie_offset + length + 4;
262  }
263  if (length > 0 && ((m_type == DWARF && cie_id == UINT32_MAX) ||
264  (m_type == EH && cie_id == 0ul))) {
265  size_t i;
266  // cie.offset = cie_offset;
267  // cie.length = length;
268  // cie.cieID = cieID;
269  cie_sp->ptr_encoding = DW_EH_PE_absptr; // default
270  cie_sp->version = m_cfi_data.GetU8(&offset);
271  if (cie_sp->version > CFI_VERSION4) {
273  llvm::formatv("CIE parse error: CFI version {0} is not supported",
274  cie_sp->version));
275  return nullptr;
276  }
277 
278  for (i = 0; i < CFI_AUG_MAX_SIZE; ++i) {
279  cie_sp->augmentation[i] = m_cfi_data.GetU8(&offset);
280  if (cie_sp->augmentation[i] == '\0') {
281  // Zero out remaining bytes in augmentation string
282  for (size_t j = i + 1; j < CFI_AUG_MAX_SIZE; ++j)
283  cie_sp->augmentation[j] = '\0';
284 
285  break;
286  }
287  }
288 
289  if (i == CFI_AUG_MAX_SIZE &&
290  cie_sp->augmentation[CFI_AUG_MAX_SIZE - 1] != '\0') {
291  Debugger::ReportError(llvm::formatv(
292  "CIE parse error: CIE augmentation string was too large "
293  "for the fixed sized buffer of {0} bytes.",
295  return nullptr;
296  }
297 
298  // m_cfi_data uses address size from target architecture of the process may
299  // ignore these fields?
300  if (m_type == DWARF && cie_sp->version >= CFI_VERSION4) {
301  cie_sp->address_size = m_cfi_data.GetU8(&offset);
302  cie_sp->segment_size = m_cfi_data.GetU8(&offset);
303  }
304 
305  cie_sp->code_align = (uint32_t)m_cfi_data.GetULEB128(&offset);
306  cie_sp->data_align = (int32_t)m_cfi_data.GetSLEB128(&offset);
307 
308  cie_sp->return_addr_reg_num =
309  m_type == DWARF && cie_sp->version >= CFI_VERSION3
310  ? static_cast<uint32_t>(m_cfi_data.GetULEB128(&offset))
311  : m_cfi_data.GetU8(&offset);
312 
313  if (cie_sp->augmentation[0]) {
314  // Get the length of the eh_frame augmentation data which starts with a
315  // ULEB128 length in bytes
316  const size_t aug_data_len = (size_t)m_cfi_data.GetULEB128(&offset);
317  const size_t aug_data_end = offset + aug_data_len;
318  const size_t aug_str_len = strlen(cie_sp->augmentation);
319  // A 'z' may be present as the first character of the string.
320  // If present, the Augmentation Data field shall be present. The contents
321  // of the Augmentation Data shall be interpreted according to other
322  // characters in the Augmentation String.
323  if (cie_sp->augmentation[0] == 'z') {
324  // Extract the Augmentation Data
325  size_t aug_str_idx = 0;
326  for (aug_str_idx = 1; aug_str_idx < aug_str_len; aug_str_idx++) {
327  char aug = cie_sp->augmentation[aug_str_idx];
328  switch (aug) {
329  case 'L':
330  // Indicates the presence of one argument in the Augmentation Data
331  // of the CIE, and a corresponding argument in the Augmentation
332  // Data of the FDE. The argument in the Augmentation Data of the
333  // CIE is 1-byte and represents the pointer encoding used for the
334  // argument in the Augmentation Data of the FDE, which is the
335  // address of a language-specific data area (LSDA). The size of the
336  // LSDA pointer is specified by the pointer encoding used.
337  cie_sp->lsda_addr_encoding = m_cfi_data.GetU8(&offset);
338  break;
339 
340  case 'P':
341  // Indicates the presence of two arguments in the Augmentation Data
342  // of the CIE. The first argument is 1-byte and represents the
343  // pointer encoding used for the second argument, which is the
344  // address of a personality routine handler. The size of the
345  // personality routine pointer is specified by the pointer encoding
346  // used.
347  //
348  // The address of the personality function will be stored at this
349  // location. Pre-execution, it will be all zero's so don't read it
350  // until we're trying to do an unwind & the reloc has been
351  // resolved.
352  {
353  uint8_t arg_ptr_encoding = m_cfi_data.GetU8(&offset);
354  const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
355  cie_sp->personality_loc = GetGNUEHPointer(
356  m_cfi_data, &offset, arg_ptr_encoding, pc_rel_addr,
358  }
359  break;
360 
361  case 'R':
362  // A 'R' may be present at any position after the
363  // first character of the string. The Augmentation Data shall
364  // include a 1 byte argument that represents the pointer encoding
365  // for the address pointers used in the FDE. Example: 0x1B ==
366  // DW_EH_PE_pcrel | DW_EH_PE_sdata4
367  cie_sp->ptr_encoding = m_cfi_data.GetU8(&offset);
368  break;
369  }
370  }
371  } else if (strcmp(cie_sp->augmentation, "eh") == 0) {
372  // If the Augmentation string has the value "eh", then the EH Data
373  // field shall be present
374  }
375 
376  // Set the offset to be the end of the augmentation data just in case we
377  // didn't understand any of the data.
378  offset = (uint32_t)aug_data_end;
379  }
380 
381  if (end_offset > offset) {
382  cie_sp->inst_offset = offset;
383  cie_sp->inst_length = end_offset - offset;
384  }
385  while (offset < end_offset) {
386  uint8_t inst = m_cfi_data.GetU8(&offset);
387  uint8_t primary_opcode = inst & 0xC0;
388  uint8_t extended_opcode = inst & 0x3F;
389 
390  if (!HandleCommonDwarfOpcode(primary_opcode, extended_opcode,
391  cie_sp->data_align, offset,
392  cie_sp->initial_row))
393  break; // Stop if we hit an unrecognized opcode
394  }
395  }
396 
397  return cie_sp;
398 }
399 
401  if (!m_cfi_data_initialized) {
402  Log *log = GetLog(LLDBLog::Unwind);
403  if (log)
404  m_objfile.GetModule()->LogMessage(log, "Reading EH frame info");
406  m_cfi_data_initialized = true;
407  }
408 }
409 // Scan through the eh_frame or debug_frame section looking for FDEs and noting
410 // the start/end addresses of the functions and a pointer back to the
411 // function's FDE for later expansion. Internalize CIEs as we come across them.
412 
414  if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
415  return;
416 
418  return;
419 
420  std::lock_guard<std::mutex> guard(m_fde_index_mutex);
421 
422  if (m_fde_index_initialized) // if two threads hit the locker
423  return;
424 
425  LLDB_SCOPED_TIMERF("%s - %s", LLVM_PRETTY_FUNCTION,
427 
428  bool clear_address_zeroth_bit = false;
429  if (ArchSpec arch = m_objfile.GetArchitecture()) {
430  if (arch.GetTriple().getArch() == llvm::Triple::arm ||
431  arch.GetTriple().getArch() == llvm::Triple::thumb)
432  clear_address_zeroth_bit = true;
433  }
434 
435  lldb::offset_t offset = 0;
437  GetCFIData();
438  while (m_cfi_data.ValidOffsetForDataOfSize(offset, 8)) {
439  const dw_offset_t current_entry = offset;
440  dw_offset_t cie_id, next_entry, cie_offset;
441  uint32_t len = m_cfi_data.GetU32(&offset);
442  bool is_64bit = (len == UINT32_MAX);
443  if (is_64bit) {
444  len = m_cfi_data.GetU64(&offset);
445  cie_id = m_cfi_data.GetU64(&offset);
446  next_entry = current_entry + len + 12;
447  cie_offset = current_entry + 12 - cie_id;
448  } else {
449  cie_id = m_cfi_data.GetU32(&offset);
450  next_entry = current_entry + len + 4;
451  cie_offset = current_entry + 4 - cie_id;
452  }
453 
454  if (next_entry > m_cfi_data.GetByteSize() + 1) {
455  Debugger::ReportError(llvm::formatv("Invalid fde/cie next entry offset "
456  "of {0:x} found in cie/fde at {1:x}",
457  next_entry, current_entry));
458  // Don't trust anything in this eh_frame section if we find blatantly
459  // invalid data.
460  m_fde_index.Clear();
462  return;
463  }
464 
465  // An FDE entry contains CIE_pointer in debug_frame in same place as cie_id
466  // in eh_frame. CIE_pointer is an offset into the .debug_frame section. So,
467  // variable cie_offset should be equal to cie_id for debug_frame.
468  // FDE entries with cie_id == 0 shouldn't be ignored for it.
469  if ((cie_id == 0 && m_type == EH) || cie_id == UINT32_MAX || len == 0) {
470  auto cie_sp = ParseCIE(current_entry);
471  if (!cie_sp) {
472  // Cannot parse, the reason is already logged
473  m_fde_index.Clear();
475  return;
476  }
477 
478  m_cie_map[current_entry] = std::move(cie_sp);
479  offset = next_entry;
480  continue;
481  }
482 
483  if (m_type == DWARF)
484  cie_offset = cie_id;
485 
486  if (cie_offset > m_cfi_data.GetByteSize()) {
487  Debugger::ReportError(llvm::formatv("Invalid cie offset of {0:x} "
488  "found in cie/fde at {1:x}",
489  cie_offset, current_entry));
490  // Don't trust anything in this eh_frame section if we find blatantly
491  // invalid data.
492  m_fde_index.Clear();
494  return;
495  }
496 
497  const CIE *cie = GetCIE(cie_offset);
498  if (cie) {
499  const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
500  const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
501  const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
502 
503  lldb::addr_t addr =
504  GetGNUEHPointer(m_cfi_data, &offset, cie->ptr_encoding, pc_rel_addr,
505  text_addr, data_addr);
506  if (clear_address_zeroth_bit)
507  addr &= ~1ull;
508 
509  lldb::addr_t length = GetGNUEHPointer(
511  pc_rel_addr, text_addr, data_addr);
512  FDEEntryMap::Entry fde(addr, length, current_entry);
513  m_fde_index.Append(fde);
514  } else {
515  Debugger::ReportError(llvm::formatv(
516  "unable to find CIE at {0:x} for cie_id = {1:x} for entry at {2:x}.",
517  cie_offset, cie_id, current_entry));
518  }
519  offset = next_entry;
520  }
521  m_fde_index.Sort();
523 }
524 
526  Address startaddr,
527  UnwindPlan &unwind_plan) {
528  Log *log = GetLog(LLDBLog::Unwind);
529  lldb::offset_t offset = dwarf_offset;
530  lldb::offset_t current_entry = offset;
531 
532  if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
533  return false;
534 
536  GetCFIData();
537 
538  uint32_t length = m_cfi_data.GetU32(&offset);
539  dw_offset_t cie_offset;
540  bool is_64bit = (length == UINT32_MAX);
541  if (is_64bit) {
542  length = m_cfi_data.GetU64(&offset);
543  cie_offset = m_cfi_data.GetU64(&offset);
544  } else {
545  cie_offset = m_cfi_data.GetU32(&offset);
546  }
547 
548  // FDE entries with zeroth cie_offset may occur for debug_frame.
549  assert(!(m_type == EH && 0 == cie_offset) && cie_offset != UINT32_MAX);
550 
551  // Translate the CIE_id from the eh_frame format, which is relative to the
552  // FDE offset, into a __eh_frame section offset
553  if (m_type == EH) {
554  unwind_plan.SetSourceName("eh_frame CFI");
555  cie_offset = current_entry + (is_64bit ? 12 : 4) - cie_offset;
557  } else {
558  unwind_plan.SetSourceName("DWARF CFI");
559  // In theory the debug_frame info should be valid at all call sites
560  // ("asynchronous unwind info" as it is sometimes called) but in practice
561  // gcc et al all emit call frame info for the prologue and call sites, but
562  // not for the epilogue or all the other locations during the function
563  // reliably.
565  }
567 
568  const CIE *cie = GetCIE(cie_offset);
569  assert(cie != nullptr);
570 
571  const dw_offset_t end_offset = current_entry + length + (is_64bit ? 12 : 4);
572 
573  const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
574  const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
575  const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
576  lldb::addr_t range_base =
577  GetGNUEHPointer(m_cfi_data, &offset, cie->ptr_encoding, pc_rel_addr,
578  text_addr, data_addr);
579  lldb::addr_t range_len = GetGNUEHPointer(
581  pc_rel_addr, text_addr, data_addr);
582  AddressRange range(range_base, m_objfile.GetAddressByteSize(),
584  range.SetByteSize(range_len);
585 
586  addr_t lsda_data_file_address = LLDB_INVALID_ADDRESS;
587 
588  if (cie->augmentation[0] == 'z') {
589  uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
590  if (aug_data_len != 0 && cie->lsda_addr_encoding != DW_EH_PE_omit) {
591  offset_t saved_offset = offset;
592  lsda_data_file_address =
594  pc_rel_addr, text_addr, data_addr);
595  if (offset - saved_offset != aug_data_len) {
596  // There is more in the augmentation region than we know how to process;
597  // don't read anything.
598  lsda_data_file_address = LLDB_INVALID_ADDRESS;
599  }
600  offset = saved_offset;
601  }
602  offset += aug_data_len;
603  }
604  unwind_plan.SetUnwindPlanForSignalTrap(
605  strchr(cie->augmentation, 'S') ? eLazyBoolYes : eLazyBoolNo);
606 
607  Address lsda_data;
608  Address personality_function_ptr;
609 
610  if (lsda_data_file_address != LLDB_INVALID_ADDRESS &&
612  m_objfile.GetModule()->ResolveFileAddress(lsda_data_file_address,
613  lsda_data);
614  m_objfile.GetModule()->ResolveFileAddress(cie->personality_loc,
615  personality_function_ptr);
616  }
617 
618  if (lsda_data.IsValid() && personality_function_ptr.IsValid()) {
619  unwind_plan.SetLSDAAddress(lsda_data);
620  unwind_plan.SetPersonalityFunctionPtr(personality_function_ptr);
621  }
622 
623  uint32_t code_align = cie->code_align;
624  int32_t data_align = cie->data_align;
625 
626  unwind_plan.SetPlanValidAddressRange(range);
627  UnwindPlan::Row *cie_initial_row = new UnwindPlan::Row;
628  *cie_initial_row = cie->initial_row;
629  UnwindPlan::RowSP row(cie_initial_row);
630 
631  unwind_plan.SetRegisterKind(GetRegisterKind());
633 
634  std::vector<UnwindPlan::RowSP> stack;
635 
637  while (m_cfi_data.ValidOffset(offset) && offset < end_offset) {
638  uint8_t inst = m_cfi_data.GetU8(&offset);
639  uint8_t primary_opcode = inst & 0xC0;
640  uint8_t extended_opcode = inst & 0x3F;
641 
642  if (!HandleCommonDwarfOpcode(primary_opcode, extended_opcode, data_align,
643  offset, *row)) {
644  if (primary_opcode) {
645  switch (primary_opcode) {
646  case DW_CFA_advance_loc: // (Row Creation Instruction)
647  { // 0x40 - high 2 bits are 0x1, lower 6 bits are delta
648  // takes a single argument that represents a constant delta. The
649  // required action is to create a new table row with a location value
650  // that is computed by taking the current entry's location value and
651  // adding (delta * code_align). All other values in the new row are
652  // initially identical to the current row.
653  unwind_plan.AppendRow(row);
654  UnwindPlan::Row *newrow = new UnwindPlan::Row;
655  *newrow = *row.get();
656  row.reset(newrow);
657  row->SlideOffset(extended_opcode * code_align);
658  break;
659  }
660 
661  case DW_CFA_restore: { // 0xC0 - high 2 bits are 0x3, lower 6 bits are
662  // register
663  // takes a single argument that represents a register number. The
664  // required action is to change the rule for the indicated register
665  // to the rule assigned it by the initial_instructions in the CIE.
666  uint32_t reg_num = extended_opcode;
667  // We only keep enough register locations around to unwind what is in
668  // our thread, and these are organized by the register index in that
669  // state, so we need to convert our eh_frame register number from the
670  // EH frame info, to a register index
671 
672  if (unwind_plan.IsValidRowIndex(0) &&
673  unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num,
674  reg_location))
675  row->SetRegisterInfo(reg_num, reg_location);
676  break;
677  }
678  }
679  } else {
680  switch (extended_opcode) {
681  case DW_CFA_set_loc: // 0x1 (Row Creation Instruction)
682  {
683  // DW_CFA_set_loc takes a single argument that represents an address.
684  // The required action is to create a new table row using the
685  // specified address as the location. All other values in the new row
686  // are initially identical to the current row. The new location value
687  // should always be greater than the current one.
688  unwind_plan.AppendRow(row);
689  UnwindPlan::Row *newrow = new UnwindPlan::Row;
690  *newrow = *row.get();
691  row.reset(newrow);
692  row->SetOffset(m_cfi_data.GetAddress(&offset) -
693  startaddr.GetFileAddress());
694  break;
695  }
696 
697  case DW_CFA_advance_loc1: // 0x2 (Row Creation Instruction)
698  {
699  // takes a single uword argument that represents a constant delta.
700  // This instruction is identical to DW_CFA_advance_loc except for the
701  // encoding and size of the delta argument.
702  unwind_plan.AppendRow(row);
703  UnwindPlan::Row *newrow = new UnwindPlan::Row;
704  *newrow = *row.get();
705  row.reset(newrow);
706  row->SlideOffset(m_cfi_data.GetU8(&offset) * code_align);
707  break;
708  }
709 
710  case DW_CFA_advance_loc2: // 0x3 (Row Creation Instruction)
711  {
712  // takes a single uword argument that represents a constant delta.
713  // This instruction is identical to DW_CFA_advance_loc except for the
714  // encoding and size of the delta argument.
715  unwind_plan.AppendRow(row);
716  UnwindPlan::Row *newrow = new UnwindPlan::Row;
717  *newrow = *row.get();
718  row.reset(newrow);
719  row->SlideOffset(m_cfi_data.GetU16(&offset) * code_align);
720  break;
721  }
722 
723  case DW_CFA_advance_loc4: // 0x4 (Row Creation Instruction)
724  {
725  // takes a single uword argument that represents a constant delta.
726  // This instruction is identical to DW_CFA_advance_loc except for the
727  // encoding and size of the delta argument.
728  unwind_plan.AppendRow(row);
729  UnwindPlan::Row *newrow = new UnwindPlan::Row;
730  *newrow = *row.get();
731  row.reset(newrow);
732  row->SlideOffset(m_cfi_data.GetU32(&offset) * code_align);
733  break;
734  }
735 
736  case DW_CFA_restore_extended: // 0x6
737  {
738  // takes a single unsigned LEB128 argument that represents a register
739  // number. This instruction is identical to DW_CFA_restore except for
740  // the encoding and size of the register argument.
741  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
742  if (unwind_plan.IsValidRowIndex(0) &&
743  unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num,
744  reg_location))
745  row->SetRegisterInfo(reg_num, reg_location);
746  break;
747  }
748 
749  case DW_CFA_remember_state: // 0xA
750  {
751  // These instructions define a stack of information. Encountering the
752  // DW_CFA_remember_state instruction means to save the rules for
753  // every register on the current row on the stack. Encountering the
754  // DW_CFA_restore_state instruction means to pop the set of rules off
755  // the stack and place them in the current row. (This operation is
756  // useful for compilers that move epilogue code into the body of a
757  // function.)
758  stack.push_back(row);
759  UnwindPlan::Row *newrow = new UnwindPlan::Row;
760  *newrow = *row.get();
761  row.reset(newrow);
762  break;
763  }
764 
765  case DW_CFA_restore_state: // 0xB
766  {
767  // These instructions define a stack of information. Encountering the
768  // DW_CFA_remember_state instruction means to save the rules for
769  // every register on the current row on the stack. Encountering the
770  // DW_CFA_restore_state instruction means to pop the set of rules off
771  // the stack and place them in the current row. (This operation is
772  // useful for compilers that move epilogue code into the body of a
773  // function.)
774  if (stack.empty()) {
775  LLDB_LOGF(log,
776  "DWARFCallFrameInfo::%s(dwarf_offset: %" PRIx32
777  ", startaddr: %" PRIx64
778  " encountered DW_CFA_restore_state but state stack "
779  "is empty. Corrupt unwind info?",
780  __FUNCTION__, dwarf_offset, startaddr.GetFileAddress());
781  break;
782  }
783  lldb::addr_t offset = row->GetOffset();
784  row = stack.back();
785  stack.pop_back();
786  row->SetOffset(offset);
787  break;
788  }
789 
790  case DW_CFA_GNU_args_size: // 0x2e
791  {
792  // The DW_CFA_GNU_args_size instruction takes an unsigned LEB128
793  // operand representing an argument size. This instruction specifies
794  // the total of the size of the arguments which have been pushed onto
795  // the stack.
796 
797  // TODO: Figure out how we should handle this.
798  m_cfi_data.GetULEB128(&offset);
799  break;
800  }
801 
802  case DW_CFA_val_offset: // 0x14
803  case DW_CFA_val_offset_sf: // 0x15
804  default:
805  break;
806  }
807  }
808  }
809  }
810  unwind_plan.AppendRow(row);
811 
812  return true;
813 }
814 
816  uint8_t extended_opcode,
817  int32_t data_align,
818  lldb::offset_t &offset,
819  UnwindPlan::Row &row) {
821 
822  if (primary_opcode) {
823  switch (primary_opcode) {
824  case DW_CFA_offset: { // 0x80 - high 2 bits are 0x2, lower 6 bits are
825  // register
826  // takes two arguments: an unsigned LEB128 constant representing a
827  // factored offset and a register number. The required action is to
828  // change the rule for the register indicated by the register number to
829  // be an offset(N) rule with a value of (N = factored offset *
830  // data_align).
831  uint8_t reg_num = extended_opcode;
832  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
833  reg_location.SetAtCFAPlusOffset(op_offset);
834  row.SetRegisterInfo(reg_num, reg_location);
835  return true;
836  }
837  }
838  } else {
839  switch (extended_opcode) {
840  case DW_CFA_nop: // 0x0
841  return true;
842 
843  case DW_CFA_offset_extended: // 0x5
844  {
845  // takes two unsigned LEB128 arguments representing a register number and
846  // a factored offset. This instruction is identical to DW_CFA_offset
847  // except for the encoding and size of the register argument.
848  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
849  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
851  reg_location.SetAtCFAPlusOffset(op_offset);
852  row.SetRegisterInfo(reg_num, reg_location);
853  return true;
854  }
855 
856  case DW_CFA_undefined: // 0x7
857  {
858  // takes a single unsigned LEB128 argument that represents a register
859  // number. The required action is to set the rule for the specified
860  // register to undefined.
861  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
863  reg_location.SetUndefined();
864  row.SetRegisterInfo(reg_num, reg_location);
865  return true;
866  }
867 
868  case DW_CFA_same_value: // 0x8
869  {
870  // takes a single unsigned LEB128 argument that represents a register
871  // number. The required action is to set the rule for the specified
872  // register to same value.
873  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
875  reg_location.SetSame();
876  row.SetRegisterInfo(reg_num, reg_location);
877  return true;
878  }
879 
880  case DW_CFA_register: // 0x9
881  {
882  // takes two unsigned LEB128 arguments representing register numbers. The
883  // required action is to set the rule for the first register to be the
884  // second register.
885  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
886  uint32_t other_reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
888  reg_location.SetInRegister(other_reg_num);
889  row.SetRegisterInfo(reg_num, reg_location);
890  return true;
891  }
892 
893  case DW_CFA_def_cfa: // 0xC (CFA Definition Instruction)
894  {
895  // Takes two unsigned LEB128 operands representing a register number and
896  // a (non-factored) offset. The required action is to define the current
897  // CFA rule to use the provided register and offset.
898  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
899  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
900  row.GetCFAValue().SetIsRegisterPlusOffset(reg_num, op_offset);
901  return true;
902  }
903 
904  case DW_CFA_def_cfa_register: // 0xD (CFA Definition Instruction)
905  {
906  // takes a single unsigned LEB128 argument representing a register
907  // number. The required action is to define the current CFA rule to use
908  // the provided register (but to keep the old offset).
909  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
910  row.GetCFAValue().SetIsRegisterPlusOffset(reg_num,
911  row.GetCFAValue().GetOffset());
912  return true;
913  }
914 
915  case DW_CFA_def_cfa_offset: // 0xE (CFA Definition Instruction)
916  {
917  // Takes a single unsigned LEB128 operand representing a (non-factored)
918  // offset. The required action is to define the current CFA rule to use
919  // the provided offset (but to keep the old register).
920  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
922  row.GetCFAValue().GetRegisterNumber(), op_offset);
923  return true;
924  }
925 
926  case DW_CFA_def_cfa_expression: // 0xF (CFA Definition Instruction)
927  {
928  size_t block_len = (size_t)m_cfi_data.GetULEB128(&offset);
929  const uint8_t *block_data =
930  static_cast<const uint8_t *>(m_cfi_data.GetData(&offset, block_len));
931  row.GetCFAValue().SetIsDWARFExpression(block_data, block_len);
932  return true;
933  }
934 
935  case DW_CFA_expression: // 0x10
936  {
937  // Takes two operands: an unsigned LEB128 value representing a register
938  // number, and a DW_FORM_block value representing a DWARF expression. The
939  // required action is to change the rule for the register indicated by
940  // the register number to be an expression(E) rule where E is the DWARF
941  // expression. That is, the DWARF expression computes the address. The
942  // value of the CFA is pushed on the DWARF evaluation stack prior to
943  // execution of the DWARF expression.
944  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
945  uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
946  const uint8_t *block_data =
947  static_cast<const uint8_t *>(m_cfi_data.GetData(&offset, block_len));
949  reg_location.SetAtDWARFExpression(block_data, block_len);
950  row.SetRegisterInfo(reg_num, reg_location);
951  return true;
952  }
953 
954  case DW_CFA_offset_extended_sf: // 0x11
955  {
956  // takes two operands: an unsigned LEB128 value representing a register
957  // number and a signed LEB128 factored offset. This instruction is
958  // identical to DW_CFA_offset_extended except that the second operand is
959  // signed and factored.
960  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
961  int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
963  reg_location.SetAtCFAPlusOffset(op_offset);
964  row.SetRegisterInfo(reg_num, reg_location);
965  return true;
966  }
967 
968  case DW_CFA_def_cfa_sf: // 0x12 (CFA Definition Instruction)
969  {
970  // Takes two operands: an unsigned LEB128 value representing a register
971  // number and a signed LEB128 factored offset. This instruction is
972  // identical to DW_CFA_def_cfa except that the second operand is signed
973  // and factored.
974  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
975  int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
976  row.GetCFAValue().SetIsRegisterPlusOffset(reg_num, op_offset);
977  return true;
978  }
979 
980  case DW_CFA_def_cfa_offset_sf: // 0x13 (CFA Definition Instruction)
981  {
982  // takes a signed LEB128 operand representing a factored offset. This
983  // instruction is identical to DW_CFA_def_cfa_offset except that the
984  // operand is signed and factored.
985  int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
986  uint32_t cfa_regnum = row.GetCFAValue().GetRegisterNumber();
987  row.GetCFAValue().SetIsRegisterPlusOffset(cfa_regnum, op_offset);
988  return true;
989  }
990 
991  case DW_CFA_val_expression: // 0x16
992  {
993  // takes two operands: an unsigned LEB128 value representing a register
994  // number, and a DW_FORM_block value representing a DWARF expression. The
995  // required action is to change the rule for the register indicated by
996  // the register number to be a val_expression(E) rule where E is the
997  // DWARF expression. That is, the DWARF expression computes the value of
998  // the given register. The value of the CFA is pushed on the DWARF
999  // evaluation stack prior to execution of the DWARF expression.
1000  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
1001  uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
1002  const uint8_t *block_data =
1003  (const uint8_t *)m_cfi_data.GetData(&offset, block_len);
1004  reg_location.SetIsDWARFExpression(block_data, block_len);
1005  row.SetRegisterInfo(reg_num, reg_location);
1006  return true;
1007  }
1008  }
1009  }
1010  return false;
1011 }
1012 
1014  const std::function<bool(lldb::addr_t, uint32_t, dw_offset_t)> &callback) {
1015  GetFDEIndex();
1016 
1017  for (size_t i = 0, c = m_fde_index.GetSize(); i < c; ++i) {
1018  const FDEEntryMap::Entry &entry = m_fde_index.GetEntryRef(i);
1019  if (!callback(entry.base, entry.size, entry.data))
1020  break;
1021  }
1022 }
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Gets the section list for the currently selected architecture (and object for archives).
Definition: ObjectFile.cpp:588
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Extract a signed LEB128 value from *offset_ptr.
Definition: DataExtractor.cpp:859
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@ EH
Definition: DWARFCallFrameInfo.h:35
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Get the current address size.
Definition: DataExtractor.h:264
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Definition: DataExtractor.h:48
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Definition: Address.cpp:291
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Definition: DataExtractor.cpp:316
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Definition: AddressRange.h:25
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Return an UnwindPlan based on the call frame information encoded in the FDE of this DWARFCallFrameInf...
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Definition: DWARFCallFrameInfo.h:35
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Definition: UnwindPlan.h:128
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Definition: UnwindPlan.h:524
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Definition: DWARFCallFrameInfo.h:35
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Definition: UnwindPlan.h:57
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Definition: UnwindPlan.h:395
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Definition: DWARFCallFrameInfo.h:114
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Definition: DWARFCallFrameInfo.h:82
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Definition: UnwindPlan.h:528
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Definition: UnwindPlan.cpp:407
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Definition: UnwindPlan.h:55
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Definition: DWARFCallFrameInfo.h:89
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@ eLazyBoolNo
Definition: lldb-private-enumerations.h:115
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Definition: UnwindPlan.cpp:403
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Definition: Address.h:59
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Definition: DWARFCallFrameInfo.h:149
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Definition: UnwindPlan.cpp:64
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Definition: DWARFCallFrameInfo.h:147
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Definition: UnwindPlan.h:227
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UINT32_MAX
#define UINT32_MAX
Definition: lldb-defines.h:19
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ObjectFile & m_objfile
Definition: DWARFCallFrameInfo.h:146
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Get const accessor for the module pointer.
Definition: ModuleChild.cpp:24
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void SetAtCFAPlusOffset(int32_t offset)
Definition: UnwindPlan.h:108
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Extract a uint32_t value from *offset_ptr.
Definition: DataExtractor.cpp:425
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Definition: DWARFCallFrameInfo.cpp:1013
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Definition: UnwindPlan.h:337
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Set accessor for the byte size of this range.
Definition: AddressRange.h:237
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Definition: lldb-defines.h:74
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Definition: UnwindPlan.h:244
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A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
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Extract a uint16_t value from *offset_ptr.
Definition: DataExtractor.cpp:347
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virtual uint32_t GetAddressByteSize() const =0
Gets the address size in bytes for the current object file.
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Definition: DWARFCallFrameInfo.cpp:247
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const void * GetData(lldb::offset_t *offset_ptr, lldb::offset_t length) const
Extract length bytes from *offset_ptr.
Definition: DataExtractor.h:337
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const CIE * GetCIE(dw_offset_t cie_offset)
Definition: DWARFCallFrameInfo.cpp:233
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Get accessor for the module for this address.
Definition: Address.cpp:283
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Definition: Log.h:115
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const Entry * FindEntryThatContainsOrFollows(B addr) const
Definition: RangeMap.h:614
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DataType data
Definition: RangeMap.h:418
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Retrieve the Log object for the channel associated with the given log enum.
Definition: Log.h:309
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Definition: DWARFCallFrameInfo.cpp:525
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uint64_t GetByteSize() const
Get the number of bytes contained in this object.
Definition: DataExtractor.h:270
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Definition: RangeMap.h:33
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Definition: UnwindPlan.h:53
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Test the availability of length bytes of data from offset.
Definition: DataExtractor.h:965
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Definition: SBAddress.h:15
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Definition: dwarf.h:19
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Definition: ObjectFile.h:60
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Definition: DWARFCallFrameInfo.h:102
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Definition: DWARFCallFrameInfo.cpp:214
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Definition: DWARFCallFrameInfo.h:152
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Definition: DWARFCallFrameInfo.h:155