Line data Source code
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 :
10 : #include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h"
11 : #include "llvm/ADT/DenseMap.h"
12 : #include "llvm/ADT/Optional.h"
13 : #include "llvm/ADT/StringExtras.h"
14 : #include "llvm/ADT/StringRef.h"
15 : #include "llvm/BinaryFormat/Dwarf.h"
16 : #include "llvm/Support/Casting.h"
17 : #include "llvm/Support/Compiler.h"
18 : #include "llvm/Support/DataExtractor.h"
19 : #include "llvm/Support/Errc.h"
20 : #include "llvm/Support/ErrorHandling.h"
21 : #include "llvm/Support/Format.h"
22 : #include "llvm/Support/raw_ostream.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 :
38 425 : Error CFIProgram::parse(DataExtractor Data, uint32_t *Offset,
39 : uint32_t EndOffset) {
40 3320 : while (*Offset < EndOffset) {
41 2895 : uint8_t Opcode = Data.getU8(Offset);
42 : // Some instructions have a primary opcode encoded in the top bits.
43 2895 : uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK;
44 :
45 2895 : if (Primary) {
46 : // If it's a primary opcode, the first operand is encoded in the bottom
47 : // bits of the opcode itself.
48 816 : uint64_t Op1 = Opcode & DWARF_CFI_PRIMARY_OPERAND_MASK;
49 816 : switch (Primary) {
50 : default:
51 : return createStringError(errc::illegal_byte_sequence,
52 : "Invalid primary CFI opcode 0x%" PRIx8,
53 0 : Primary);
54 499 : case DW_CFA_advance_loc:
55 : case DW_CFA_restore:
56 499 : addInstruction(Primary, Op1);
57 499 : break;
58 317 : case DW_CFA_offset:
59 317 : addInstruction(Primary, Op1, Data.getULEB128(Offset));
60 317 : break;
61 : }
62 : } else {
63 : // Extended opcode - its value is Opcode itself.
64 2079 : switch (Opcode) {
65 : default:
66 : return createStringError(errc::illegal_byte_sequence,
67 : "Invalid extended CFI opcode 0x%" PRIx8,
68 0 : Opcode);
69 1449 : 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 1449 : addInstruction(Opcode);
75 1449 : break;
76 : case DW_CFA_set_loc:
77 : // Operands: Address
78 0 : addInstruction(Opcode, Data.getAddress(Offset));
79 0 : break;
80 6 : case DW_CFA_advance_loc1:
81 : // Operands: 1-byte delta
82 6 : addInstruction(Opcode, Data.getU8(Offset));
83 6 : break;
84 1 : case DW_CFA_advance_loc2:
85 : // Operands: 2-byte delta
86 1 : addInstruction(Opcode, Data.getU16(Offset));
87 1 : break;
88 0 : case DW_CFA_advance_loc4:
89 : // Operands: 4-byte delta
90 0 : addInstruction(Opcode, Data.getU32(Offset));
91 0 : break;
92 425 : 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
99 425 : addInstruction(Opcode, Data.getULEB128(Offset));
100 425 : break;
101 0 : case DW_CFA_def_cfa_offset_sf:
102 : // Operands: SLEB128
103 0 : addInstruction(Opcode, Data.getSLEB128(Offset));
104 0 : break;
105 191 : 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.
113 191 : auto op1 = Data.getULEB128(Offset);
114 191 : auto op2 = Data.getULEB128(Offset);
115 191 : addInstruction(Opcode, op1, op2);
116 191 : break;
117 : }
118 0 : 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 0 : auto op1 = Data.getULEB128(Offset);
124 0 : auto op2 = (uint64_t)Data.getSLEB128(Offset);
125 0 : addInstruction(Opcode, op1, op2);
126 0 : break;
127 : }
128 6 : case DW_CFA_def_cfa_expression: {
129 6 : uint32_t ExprLength = Data.getULEB128(Offset);
130 6 : addInstruction(Opcode, 0);
131 : DataExtractor Extractor(
132 6 : Data.getData().slice(*Offset, *Offset + ExprLength),
133 18 : Data.isLittleEndian(), Data.getAddressSize());
134 6 : Instructions.back().Expression = DWARFExpression(
135 : Extractor, Data.getAddressSize(), dwarf::DWARF_VERSION);
136 6 : *Offset += ExprLength;
137 : break;
138 : }
139 1 : case DW_CFA_expression:
140 : case DW_CFA_val_expression: {
141 1 : auto RegNum = Data.getULEB128(Offset);
142 1 : auto BlockLength = Data.getULEB128(Offset);
143 1 : addInstruction(Opcode, RegNum, 0);
144 : DataExtractor Extractor(
145 1 : Data.getData().slice(*Offset, *Offset + BlockLength),
146 3 : Data.isLittleEndian(), Data.getAddressSize());
147 1 : Instructions.back().Expression = DWARFExpression(
148 : Extractor, Data.getAddressSize(), dwarf::DWARF_VERSION);
149 1 : *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 1941 : ArrayRef<CFIProgram::OperandType[2]> CFIProgram::getOperandTypes() {
165 : static OperandType OpTypes[DW_CFA_restore+1][2];
166 : static bool Initialized = false;
167 1941 : if (Initialized) {
168 1823 : return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1);
169 : }
170 118 : 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 :
180 118 : DECLARE_OP1(DW_CFA_set_loc, OT_Address);
181 118 : DECLARE_OP1(DW_CFA_advance_loc, OT_FactoredCodeOffset);
182 118 : DECLARE_OP1(DW_CFA_advance_loc1, OT_FactoredCodeOffset);
183 118 : DECLARE_OP1(DW_CFA_advance_loc2, OT_FactoredCodeOffset);
184 118 : DECLARE_OP1(DW_CFA_advance_loc4, OT_FactoredCodeOffset);
185 118 : DECLARE_OP1(DW_CFA_MIPS_advance_loc8, OT_FactoredCodeOffset);
186 118 : DECLARE_OP2(DW_CFA_def_cfa, OT_Register, OT_Offset);
187 118 : DECLARE_OP2(DW_CFA_def_cfa_sf, OT_Register, OT_SignedFactDataOffset);
188 118 : DECLARE_OP1(DW_CFA_def_cfa_register, OT_Register);
189 118 : DECLARE_OP1(DW_CFA_def_cfa_offset, OT_Offset);
190 118 : DECLARE_OP1(DW_CFA_def_cfa_offset_sf, OT_SignedFactDataOffset);
191 118 : DECLARE_OP1(DW_CFA_def_cfa_expression, OT_Expression);
192 118 : DECLARE_OP1(DW_CFA_undefined, OT_Register);
193 118 : DECLARE_OP1(DW_CFA_same_value, OT_Register);
194 118 : DECLARE_OP2(DW_CFA_offset, OT_Register, OT_UnsignedFactDataOffset);
195 118 : DECLARE_OP2(DW_CFA_offset_extended, OT_Register, OT_UnsignedFactDataOffset);
196 118 : DECLARE_OP2(DW_CFA_offset_extended_sf, OT_Register, OT_SignedFactDataOffset);
197 118 : DECLARE_OP2(DW_CFA_val_offset, OT_Register, OT_UnsignedFactDataOffset);
198 118 : DECLARE_OP2(DW_CFA_val_offset_sf, OT_Register, OT_SignedFactDataOffset);
199 118 : DECLARE_OP2(DW_CFA_register, OT_Register, OT_Register);
200 118 : DECLARE_OP2(DW_CFA_expression, OT_Register, OT_Expression);
201 118 : DECLARE_OP2(DW_CFA_val_expression, OT_Register, OT_Expression);
202 118 : DECLARE_OP1(DW_CFA_restore, OT_Register);
203 118 : DECLARE_OP1(DW_CFA_restore_extended, OT_Register);
204 118 : DECLARE_OP0(DW_CFA_remember_state);
205 118 : DECLARE_OP0(DW_CFA_restore_state);
206 118 : DECLARE_OP0(DW_CFA_GNU_window_save);
207 118 : DECLARE_OP1(DW_CFA_GNU_args_size, OT_Offset);
208 118 : DECLARE_OP0(DW_CFA_nop);
209 :
210 : #undef DECLARE_OP0
211 : #undef DECLARE_OP1
212 : #undef DECLARE_OP2
213 :
214 118 : 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 1941 : 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 1941 : uint8_t Opcode = Instr.Opcode;
223 1941 : OperandType Type = getOperandTypes()[Opcode][OperandIdx];
224 :
225 1941 : switch (Type) {
226 0 : case OT_Unset: {
227 0 : OS << " Unsupported " << (OperandIdx ? "second" : "first") << " operand to";
228 0 : auto OpcodeName = CallFrameString(Opcode);
229 0 : if (!OpcodeName.empty())
230 0 : OS << " " << OpcodeName;
231 : else
232 0 : OS << format(" Opcode %x", Opcode);
233 : break;
234 : }
235 : case OT_None:
236 : break;
237 0 : case OT_Address:
238 0 : OS << format(" %" PRIx64, Operand);
239 0 : break;
240 446 : 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.
244 892 : OS << format(" %+" PRId64, int64_t(Operand));
245 446 : break;
246 497 : case OT_FactoredCodeOffset: // Always Unsigned
247 497 : if (CodeAlignmentFactor)
248 994 : OS << format(" %" PRId64, Operand * CodeAlignmentFactor);
249 : else
250 0 : OS << format(" %" PRId64 "*code_alignment_factor" , Operand);
251 : break;
252 0 : case OT_SignedFactDataOffset:
253 0 : if (DataAlignmentFactor)
254 0 : OS << format(" %" PRId64, int64_t(Operand) * DataAlignmentFactor);
255 : else
256 0 : OS << format(" %" PRId64 "*data_alignment_factor" , int64_t(Operand));
257 : break;
258 314 : case OT_UnsignedFactDataOffset:
259 314 : if (DataAlignmentFactor)
260 628 : OS << format(" %" PRId64, Operand * DataAlignmentFactor);
261 : else
262 0 : OS << format(" %" PRId64 "*data_alignment_factor" , Operand);
263 : break;
264 677 : case OT_Register:
265 677 : OS << format(" reg%" PRId64, Operand);
266 677 : break;
267 7 : case OT_Expression:
268 : assert(Instr.Expression && "missing DWARFExpression object");
269 7 : OS << " ";
270 7 : Instr.Expression->print(OS, MRI, IsEH);
271 7 : break;
272 : }
273 1941 : }
274 :
275 422 : void CFIProgram::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH,
276 : unsigned IndentLevel) const {
277 3304 : for (const auto &Instr : Instructions) {
278 2882 : uint8_t Opcode = Instr.Opcode;
279 2882 : if (Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK)
280 : Opcode &= DWARF_CFI_PRIMARY_OPCODE_MASK;
281 2882 : OS.indent(2 * IndentLevel);
282 2882 : OS << CallFrameString(Opcode) << ":";
283 4823 : for (unsigned i = 0; i < Instr.Ops.size(); ++i)
284 1941 : printOperand(OS, MRI, IsEH, Instr, i, Instr.Ops[i]);
285 : OS << '\n';
286 : }
287 422 : }
288 :
289 135 : void CIE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const {
290 270 : OS << format("%08x %08x %08x CIE", (uint32_t)Offset, (uint32_t)Length,
291 135 : DW_CIE_ID)
292 135 : << "\n";
293 135 : OS << format(" Version: %d\n", Version);
294 270 : OS << " Augmentation: \"" << Augmentation << "\"\n";
295 135 : if (Version >= 4) {
296 44 : OS << format(" Address size: %u\n", (uint32_t)AddressSize);
297 22 : OS << format(" Segment desc size: %u\n",
298 44 : (uint32_t)SegmentDescriptorSize);
299 : }
300 270 : OS << format(" Code alignment factor: %u\n", (uint32_t)CodeAlignmentFactor);
301 270 : OS << format(" Data alignment factor: %d\n", (int32_t)DataAlignmentFactor);
302 270 : OS << format(" Return address column: %d\n", (int32_t)ReturnAddressRegister);
303 135 : if (Personality)
304 14 : OS << format(" Personality Address: %08x\n", *Personality);
305 135 : if (!AugmentationData.empty()) {
306 88 : OS << " Augmentation data: ";
307 219 : for (uint8_t Byte : AugmentationData)
308 131 : OS << ' ' << hexdigit(Byte >> 4) << hexdigit(Byte & 0xf);
309 88 : OS << "\n";
310 : }
311 135 : OS << "\n";
312 135 : CFIs.dump(OS, MRI, IsEH);
313 135 : OS << "\n";
314 135 : }
315 :
316 278 : void FDE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const {
317 556 : OS << format("%08x %08x %08x FDE ", (uint32_t)Offset, (uint32_t)Length,
318 556 : (int32_t)LinkedCIEOffset);
319 556 : OS << format("cie=%08x pc=%08x...%08x\n", (int32_t)LinkedCIEOffset,
320 : (uint32_t)InitialLocation,
321 556 : (uint32_t)InitialLocation + (uint32_t)AddressRange);
322 278 : if (LSDAAddress)
323 22 : OS << format(" LSDA Address: %08x\n", *LSDAAddress);
324 278 : CFIs.dump(OS, MRI, IsEH);
325 278 : OS << "\n";
326 278 : }
327 :
328 142 : DWARFDebugFrame::DWARFDebugFrame(bool IsEH, uint64_t EHFrameAddress)
329 284 : : IsEH(IsEH), EHFrameAddress(EHFrameAddress) {}
330 :
331 : DWARFDebugFrame::~DWARFDebugFrame() = default;
332 :
333 : static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data,
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).
347 0 : static void LLVM_ATTRIBUTE_NORETURN ReportError(uint32_t StartOffset,
348 : const char *ErrorMsg) {
349 : std::string Str;
350 : raw_string_ostream OS(Str);
351 0 : OS << format(ErrorMsg, StartOffset);
352 : OS.flush();
353 0 : report_fatal_error(Str);
354 : }
355 :
356 142 : void DWARFDebugFrame::parse(DWARFDataExtractor Data) {
357 142 : uint32_t Offset = 0;
358 : DenseMap<uint32_t, CIE *> CIEs;
359 :
360 709 : while (Data.isValidOffset(Offset)) {
361 425 : uint32_t StartOffset = Offset;
362 :
363 : bool IsDWARF64 = false;
364 425 : uint64_t Length = Data.getU32(&Offset);
365 : uint64_t Id;
366 :
367 425 : 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 0 : 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*
381 425 : uint32_t StartStructureOffset = Offset;
382 425 : uint32_t EndStructureOffset = Offset + static_cast<uint32_t>(Length);
383 :
384 : // The Id field's size depends on the DWARF format
385 850 : Id = Data.getUnsigned(&Offset, (IsDWARF64 && !IsEH) ? 8 : 4);
386 : bool IsCIE =
387 425 : ((IsDWARF64 && Id == DW64_CIE_ID) || Id == DW_CIE_ID || (IsEH && !Id));
388 :
389 : if (IsCIE) {
390 140 : uint8_t Version = Data.getU8(&Offset);
391 140 : const char *Augmentation = Data.getCStr(&Offset);
392 140 : StringRef AugmentationString(Augmentation ? Augmentation : "");
393 140 : uint8_t AddressSize = Version < 4 ? Data.getAddressSize() :
394 140 : Data.getU8(&Offset);
395 : Data.setAddressSize(AddressSize);
396 140 : uint8_t SegmentDescriptorSize = Version < 4 ? 0 : Data.getU8(&Offset);
397 140 : uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset);
398 140 : int64_t DataAlignmentFactor = Data.getSLEB128(&Offset);
399 140 : uint64_t ReturnAddressRegister = Data.getULEB128(&Offset);
400 :
401 : // Parse the augmentation data for EH CIEs
402 : StringRef AugmentationData("");
403 140 : uint32_t FDEPointerEncoding = DW_EH_PE_absptr;
404 140 : uint32_t LSDAPointerEncoding = DW_EH_PE_omit;
405 : Optional<uint64_t> Personality;
406 : Optional<uint32_t> PersonalityEncoding;
407 140 : 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.
413 300 : for (unsigned i = 0, e = AugmentationString.size(); i != e; ++i) {
414 394 : switch (AugmentationString[i]) {
415 0 : default:
416 0 : ReportError(StartOffset,
417 : "Unknown augmentation character in entry at %lx");
418 8 : case 'L':
419 8 : LSDAPointerEncoding = Data.getU8(&Offset);
420 8 : break;
421 7 : case 'P': {
422 7 : if (Personality)
423 0 : ReportError(StartOffset,
424 : "Duplicate personality in entry at %lx");
425 7 : PersonalityEncoding = Data.getU8(&Offset);
426 21 : Personality = Data.getEncodedPointer(
427 7 : &Offset, *PersonalityEncoding,
428 7 : EHFrameAddress ? EHFrameAddress + Offset : 0);
429 7 : break;
430 : }
431 91 : case 'R':
432 91 : FDEPointerEncoding = Data.getU8(&Offset);
433 91 : break;
434 : case 'S':
435 : // Current frame is a signal trampoline.
436 : break;
437 91 : case 'z':
438 91 : if (i)
439 0 : 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 91 : AugmentationLength = Data.getULEB128(&Offset);
444 91 : StartAugmentationOffset = Offset;
445 91 : EndAugmentationOffset = Offset +
446 : static_cast<uint32_t>(*AugmentationLength);
447 : }
448 : }
449 :
450 103 : if (AugmentationLength.hasValue()) {
451 91 : if (Offset != EndAugmentationOffset)
452 0 : ReportError(StartOffset, "Parsing augmentation data at %lx failed");
453 :
454 182 : AugmentationData = Data.getData().slice(StartAugmentationOffset,
455 182 : 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,
463 140 : LSDAPointerEncoding, Personality, PersonalityEncoding);
464 140 : CIEs[StartOffset] = Cie.get();
465 140 : 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;
472 285 : CIE *Cie = CIEs[IsEH ? (StartStructureOffset - CIEPointer) : CIEPointer];
473 :
474 285 : if (IsEH) {
475 : // The address size is encoded in the CIE we reference.
476 240 : if (!Cie)
477 0 : ReportError(StartOffset,
478 : "Parsing FDE data at %lx failed due to missing CIE");
479 :
480 240 : if (auto Val = Data.getEncodedPointer(
481 240 : &Offset, Cie->getFDEPointerEncoding(),
482 240 : EHFrameAddress ? EHFrameAddress + Offset : 0)) {
483 240 : InitialLocation = *Val;
484 : }
485 240 : if (auto Val = Data.getEncodedPointer(
486 240 : &Offset, Cie->getFDEPointerEncoding(), 0)) {
487 240 : AddressRange = *Val;
488 : }
489 :
490 : StringRef AugmentationString = Cie->getAugmentationString();
491 240 : if (!AugmentationString.empty()) {
492 : // Parse the augmentation length and data for this FDE.
493 240 : uint64_t AugmentationLength = Data.getULEB128(&Offset);
494 :
495 240 : uint32_t EndAugmentationOffset =
496 240 : Offset + static_cast<uint32_t>(AugmentationLength);
497 :
498 : // Decode the LSDA if the CIE augmentation string said we should.
499 240 : if (Cie->getLSDAPointerEncoding() != DW_EH_PE_omit) {
500 22 : LSDAAddress = Data.getEncodedPointer(
501 : &Offset, Cie->getLSDAPointerEncoding(),
502 11 : EHFrameAddress ? Offset + EHFrameAddress : 0);
503 : }
504 :
505 240 : if (Offset != EndAugmentationOffset)
506 0 : ReportError(StartOffset, "Parsing augmentation data at %lx failed");
507 : }
508 : } else {
509 : InitialLocation = Data.getAddress(&Offset);
510 : AddressRange = Data.getAddress(&Offset);
511 : }
512 :
513 570 : Entries.emplace_back(new FDE(StartOffset, Length, CIEPointer,
514 : InitialLocation, AddressRange,
515 285 : Cie, LSDAAddress));
516 : }
517 :
518 425 : if (Error E =
519 425 : Entries.back()->cfis().parse(Data, &Offset, EndStructureOffset)) {
520 0 : report_fatal_error(toString(std::move(E)));
521 : }
522 :
523 425 : if (Offset != EndStructureOffset)
524 0 : ReportError(StartOffset, "Parsing entry instructions at %lx failed");
525 : }
526 142 : }
527 :
528 4 : 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 8 : uint64_t Offset) { return E->getOffset() < Offset; });
533 4 : if (It != Entries.end() && (*It)->getOffset() == Offset)
534 : return It->get();
535 : return nullptr;
536 : }
537 :
538 141 : void DWARFDebugFrame::dump(raw_ostream &OS, const MCRegisterInfo *MRI,
539 : Optional<uint64_t> Offset) const {
540 141 : if (Offset) {
541 4 : if (auto *Entry = getEntryAtOffset(*Offset))
542 2 : Entry->dump(OS, MRI, IsEH);
543 4 : return;
544 : }
545 :
546 137 : OS << "\n";
547 548 : for (const auto &Entry : Entries)
548 411 : Entry->dump(OS, MRI, IsEH);
549 : }
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