1 //===- FileAnalysis.cpp -----------------------------------------*- C++ -*-===//
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
9 #include "FileAnalysis.h"
10 #include "GraphBuilder.h"
11
12 #include "llvm/BinaryFormat/ELF.h"
13 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
14 #include "llvm/MC/MCAsmInfo.h"
15 #include "llvm/MC/MCContext.h"
16 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
17 #include "llvm/MC/MCInst.h"
18 #include "llvm/MC/MCInstPrinter.h"
19 #include "llvm/MC/MCInstrAnalysis.h"
20 #include "llvm/MC/MCInstrDesc.h"
21 #include "llvm/MC/MCInstrInfo.h"
22 #include "llvm/MC/MCObjectFileInfo.h"
23 #include "llvm/MC/MCRegisterInfo.h"
24 #include "llvm/MC/MCSubtargetInfo.h"
25 #include "llvm/MC/MCTargetOptions.h"
26 #include "llvm/Object/Binary.h"
27 #include "llvm/Object/COFF.h"
28 #include "llvm/Object/ELFObjectFile.h"
29 #include "llvm/Object/ObjectFile.h"
30 #include "llvm/Support/Casting.h"
31 #include "llvm/Support/CommandLine.h"
32 #include "llvm/Support/Error.h"
33 #include "llvm/Support/MemoryBuffer.h"
34 #include "llvm/Support/TargetRegistry.h"
35 #include "llvm/Support/TargetSelect.h"
36 #include "llvm/Support/raw_ostream.h"
37
38
39 using Instr = llvm::cfi_verify::FileAnalysis::Instr;
40 using LLVMSymbolizer = llvm::symbolize::LLVMSymbolizer;
41
42 namespace llvm {
43 namespace cfi_verify {
44
45 bool IgnoreDWARFFlag;
46
47 static cl::opt<bool, true> IgnoreDWARFArg(
48 "ignore-dwarf",
49 cl::desc(
50 "Ignore all DWARF data. This relaxes the requirements for all "
51 "statically linked libraries to have been compiled with '-g', but "
52 "will result in false positives for 'CFI unprotected' instructions."),
53 cl::location(IgnoreDWARFFlag), cl::init(false));
54
stringCFIProtectionStatus(CFIProtectionStatus Status)55 StringRef stringCFIProtectionStatus(CFIProtectionStatus Status) {
56 switch (Status) {
57 case CFIProtectionStatus::PROTECTED:
58 return "PROTECTED";
59 case CFIProtectionStatus::FAIL_NOT_INDIRECT_CF:
60 return "FAIL_NOT_INDIRECT_CF";
61 case CFIProtectionStatus::FAIL_ORPHANS:
62 return "FAIL_ORPHANS";
63 case CFIProtectionStatus::FAIL_BAD_CONDITIONAL_BRANCH:
64 return "FAIL_BAD_CONDITIONAL_BRANCH";
65 case CFIProtectionStatus::FAIL_REGISTER_CLOBBERED:
66 return "FAIL_REGISTER_CLOBBERED";
67 case CFIProtectionStatus::FAIL_INVALID_INSTRUCTION:
68 return "FAIL_INVALID_INSTRUCTION";
69 }
70 llvm_unreachable("Attempted to stringify an unknown enum value.");
71 }
72
Create(StringRef Filename)73 Expected<FileAnalysis> FileAnalysis::Create(StringRef Filename) {
74 // Open the filename provided.
75 Expected<object::OwningBinary<object::Binary>> BinaryOrErr =
76 object::createBinary(Filename);
77 if (!BinaryOrErr)
78 return BinaryOrErr.takeError();
79
80 // Construct the object and allow it to take ownership of the binary.
81 object::OwningBinary<object::Binary> Binary = std::move(BinaryOrErr.get());
82 FileAnalysis Analysis(std::move(Binary));
83
84 Analysis.Object = dyn_cast<object::ObjectFile>(Analysis.Binary.getBinary());
85 if (!Analysis.Object)
86 return make_error<UnsupportedDisassembly>("Failed to cast object");
87
88 switch (Analysis.Object->getArch()) {
89 case Triple::x86:
90 case Triple::x86_64:
91 case Triple::aarch64:
92 case Triple::aarch64_be:
93 break;
94 default:
95 return make_error<UnsupportedDisassembly>("Unsupported architecture.");
96 }
97
98 Analysis.ObjectTriple = Analysis.Object->makeTriple();
99 Analysis.Features = Analysis.Object->getFeatures();
100
101 // Init the rest of the object.
102 if (auto InitResponse = Analysis.initialiseDisassemblyMembers())
103 return std::move(InitResponse);
104
105 if (auto SectionParseResponse = Analysis.parseCodeSections())
106 return std::move(SectionParseResponse);
107
108 if (auto SymbolTableParseResponse = Analysis.parseSymbolTable())
109 return std::move(SymbolTableParseResponse);
110
111 return std::move(Analysis);
112 }
113
FileAnalysis(object::OwningBinary<object::Binary> Binary)114 FileAnalysis::FileAnalysis(object::OwningBinary<object::Binary> Binary)
115 : Binary(std::move(Binary)) {}
116
FileAnalysis(const Triple & ObjectTriple,const SubtargetFeatures & Features)117 FileAnalysis::FileAnalysis(const Triple &ObjectTriple,
118 const SubtargetFeatures &Features)
119 : ObjectTriple(ObjectTriple), Features(Features) {}
120
121 const Instr *
getPrevInstructionSequential(const Instr & InstrMeta) const122 FileAnalysis::getPrevInstructionSequential(const Instr &InstrMeta) const {
123 std::map<uint64_t, Instr>::const_iterator KV =
124 Instructions.find(InstrMeta.VMAddress);
125 if (KV == Instructions.end() || KV == Instructions.begin())
126 return nullptr;
127
128 if (!(--KV)->second.Valid)
129 return nullptr;
130
131 return &KV->second;
132 }
133
134 const Instr *
getNextInstructionSequential(const Instr & InstrMeta) const135 FileAnalysis::getNextInstructionSequential(const Instr &InstrMeta) const {
136 std::map<uint64_t, Instr>::const_iterator KV =
137 Instructions.find(InstrMeta.VMAddress);
138 if (KV == Instructions.end() || ++KV == Instructions.end())
139 return nullptr;
140
141 if (!KV->second.Valid)
142 return nullptr;
143
144 return &KV->second;
145 }
146
usesRegisterOperand(const Instr & InstrMeta) const147 bool FileAnalysis::usesRegisterOperand(const Instr &InstrMeta) const {
148 for (const auto &Operand : InstrMeta.Instruction) {
149 if (Operand.isReg())
150 return true;
151 }
152 return false;
153 }
154
getInstruction(uint64_t Address) const155 const Instr *FileAnalysis::getInstruction(uint64_t Address) const {
156 const auto &InstrKV = Instructions.find(Address);
157 if (InstrKV == Instructions.end())
158 return nullptr;
159
160 return &InstrKV->second;
161 }
162
getInstructionOrDie(uint64_t Address) const163 const Instr &FileAnalysis::getInstructionOrDie(uint64_t Address) const {
164 const auto &InstrKV = Instructions.find(Address);
165 assert(InstrKV != Instructions.end() && "Address doesn't exist.");
166 return InstrKV->second;
167 }
168
isCFITrap(const Instr & InstrMeta) const169 bool FileAnalysis::isCFITrap(const Instr &InstrMeta) const {
170 const auto &InstrDesc = MII->get(InstrMeta.Instruction.getOpcode());
171 return InstrDesc.isTrap() || willTrapOnCFIViolation(InstrMeta);
172 }
173
willTrapOnCFIViolation(const Instr & InstrMeta) const174 bool FileAnalysis::willTrapOnCFIViolation(const Instr &InstrMeta) const {
175 const auto &InstrDesc = MII->get(InstrMeta.Instruction.getOpcode());
176 if (!InstrDesc.isCall())
177 return false;
178 uint64_t Target;
179 if (!MIA->evaluateBranch(InstrMeta.Instruction, InstrMeta.VMAddress,
180 InstrMeta.InstructionSize, Target))
181 return false;
182 return TrapOnFailFunctionAddresses.contains(Target);
183 }
184
canFallThrough(const Instr & InstrMeta) const185 bool FileAnalysis::canFallThrough(const Instr &InstrMeta) const {
186 if (!InstrMeta.Valid)
187 return false;
188
189 if (isCFITrap(InstrMeta))
190 return false;
191
192 const auto &InstrDesc = MII->get(InstrMeta.Instruction.getOpcode());
193 if (InstrDesc.mayAffectControlFlow(InstrMeta.Instruction, *RegisterInfo))
194 return InstrDesc.isConditionalBranch();
195
196 return true;
197 }
198
199 const Instr *
getDefiniteNextInstruction(const Instr & InstrMeta) const200 FileAnalysis::getDefiniteNextInstruction(const Instr &InstrMeta) const {
201 if (!InstrMeta.Valid)
202 return nullptr;
203
204 if (isCFITrap(InstrMeta))
205 return nullptr;
206
207 const auto &InstrDesc = MII->get(InstrMeta.Instruction.getOpcode());
208 const Instr *NextMetaPtr;
209 if (InstrDesc.mayAffectControlFlow(InstrMeta.Instruction, *RegisterInfo)) {
210 if (InstrDesc.isConditionalBranch())
211 return nullptr;
212
213 uint64_t Target;
214 if (!MIA->evaluateBranch(InstrMeta.Instruction, InstrMeta.VMAddress,
215 InstrMeta.InstructionSize, Target))
216 return nullptr;
217
218 NextMetaPtr = getInstruction(Target);
219 } else {
220 NextMetaPtr =
221 getInstruction(InstrMeta.VMAddress + InstrMeta.InstructionSize);
222 }
223
224 if (!NextMetaPtr || !NextMetaPtr->Valid)
225 return nullptr;
226
227 return NextMetaPtr;
228 }
229
230 std::set<const Instr *>
getDirectControlFlowXRefs(const Instr & InstrMeta) const231 FileAnalysis::getDirectControlFlowXRefs(const Instr &InstrMeta) const {
232 std::set<const Instr *> CFCrossReferences;
233 const Instr *PrevInstruction = getPrevInstructionSequential(InstrMeta);
234
235 if (PrevInstruction && canFallThrough(*PrevInstruction))
236 CFCrossReferences.insert(PrevInstruction);
237
238 const auto &TargetRefsKV = StaticBranchTargetings.find(InstrMeta.VMAddress);
239 if (TargetRefsKV == StaticBranchTargetings.end())
240 return CFCrossReferences;
241
242 for (uint64_t SourceInstrAddress : TargetRefsKV->second) {
243 const auto &SourceInstrKV = Instructions.find(SourceInstrAddress);
244 if (SourceInstrKV == Instructions.end()) {
245 errs() << "Failed to find source instruction at address "
246 << format_hex(SourceInstrAddress, 2)
247 << " for the cross-reference to instruction at address "
248 << format_hex(InstrMeta.VMAddress, 2) << ".\n";
249 continue;
250 }
251
252 CFCrossReferences.insert(&SourceInstrKV->second);
253 }
254
255 return CFCrossReferences;
256 }
257
258 const std::set<object::SectionedAddress> &
getIndirectInstructions() const259 FileAnalysis::getIndirectInstructions() const {
260 return IndirectInstructions;
261 }
262
getRegisterInfo() const263 const MCRegisterInfo *FileAnalysis::getRegisterInfo() const {
264 return RegisterInfo.get();
265 }
266
getMCInstrInfo() const267 const MCInstrInfo *FileAnalysis::getMCInstrInfo() const { return MII.get(); }
268
getMCInstrAnalysis() const269 const MCInstrAnalysis *FileAnalysis::getMCInstrAnalysis() const {
270 return MIA.get();
271 }
272
273 Expected<DIInliningInfo>
symbolizeInlinedCode(object::SectionedAddress Address)274 FileAnalysis::symbolizeInlinedCode(object::SectionedAddress Address) {
275 assert(Symbolizer != nullptr && "Symbolizer is invalid.");
276
277 return Symbolizer->symbolizeInlinedCode(std::string(Object->getFileName()),
278 Address);
279 }
280
281 CFIProtectionStatus
validateCFIProtection(const GraphResult & Graph) const282 FileAnalysis::validateCFIProtection(const GraphResult &Graph) const {
283 const Instr *InstrMetaPtr = getInstruction(Graph.BaseAddress);
284 if (!InstrMetaPtr)
285 return CFIProtectionStatus::FAIL_INVALID_INSTRUCTION;
286
287 const auto &InstrDesc = MII->get(InstrMetaPtr->Instruction.getOpcode());
288 if (!InstrDesc.mayAffectControlFlow(InstrMetaPtr->Instruction, *RegisterInfo))
289 return CFIProtectionStatus::FAIL_NOT_INDIRECT_CF;
290
291 if (!usesRegisterOperand(*InstrMetaPtr))
292 return CFIProtectionStatus::FAIL_NOT_INDIRECT_CF;
293
294 if (!Graph.OrphanedNodes.empty())
295 return CFIProtectionStatus::FAIL_ORPHANS;
296
297 for (const auto &BranchNode : Graph.ConditionalBranchNodes) {
298 if (!BranchNode.CFIProtection)
299 return CFIProtectionStatus::FAIL_BAD_CONDITIONAL_BRANCH;
300 }
301
302 if (indirectCFOperandClobber(Graph) != Graph.BaseAddress)
303 return CFIProtectionStatus::FAIL_REGISTER_CLOBBERED;
304
305 return CFIProtectionStatus::PROTECTED;
306 }
307
indirectCFOperandClobber(const GraphResult & Graph) const308 uint64_t FileAnalysis::indirectCFOperandClobber(const GraphResult &Graph) const {
309 assert(Graph.OrphanedNodes.empty() && "Orphaned nodes should be empty.");
310
311 // Get the set of registers we must check to ensure they're not clobbered.
312 const Instr &IndirectCF = getInstructionOrDie(Graph.BaseAddress);
313 DenseSet<unsigned> RegisterNumbers;
314 for (const auto &Operand : IndirectCF.Instruction) {
315 if (Operand.isReg())
316 RegisterNumbers.insert(Operand.getReg());
317 }
318 assert(RegisterNumbers.size() && "Zero register operands on indirect CF.");
319
320 // Now check all branches to indirect CFs and ensure no clobbering happens.
321 for (const auto &Branch : Graph.ConditionalBranchNodes) {
322 uint64_t Node;
323 if (Branch.IndirectCFIsOnTargetPath)
324 Node = Branch.Target;
325 else
326 Node = Branch.Fallthrough;
327
328 // Some architectures (e.g., AArch64) cannot load in an indirect branch, so
329 // we allow them one load.
330 bool canLoad = !MII->get(IndirectCF.Instruction.getOpcode()).mayLoad();
331
332 // We walk backwards from the indirect CF. It is the last node returned by
333 // Graph.flattenAddress, so we skip it since we already handled it.
334 DenseSet<unsigned> CurRegisterNumbers = RegisterNumbers;
335 std::vector<uint64_t> Nodes = Graph.flattenAddress(Node);
336 for (auto I = Nodes.rbegin() + 1, E = Nodes.rend(); I != E; ++I) {
337 Node = *I;
338 const Instr &NodeInstr = getInstructionOrDie(Node);
339 const auto &InstrDesc = MII->get(NodeInstr.Instruction.getOpcode());
340
341 for (auto RI = CurRegisterNumbers.begin(), RE = CurRegisterNumbers.end();
342 RI != RE; ++RI) {
343 unsigned RegNum = *RI;
344 if (InstrDesc.hasDefOfPhysReg(NodeInstr.Instruction, RegNum,
345 *RegisterInfo)) {
346 if (!canLoad || !InstrDesc.mayLoad())
347 return Node;
348 canLoad = false;
349 CurRegisterNumbers.erase(RI);
350 // Add the registers this load reads to those we check for clobbers.
351 for (unsigned i = InstrDesc.getNumDefs(),
352 e = InstrDesc.getNumOperands(); i != e; i++) {
353 const auto Operand = NodeInstr.Instruction.getOperand(i);
354 if (Operand.isReg())
355 CurRegisterNumbers.insert(Operand.getReg());
356 }
357 break;
358 }
359 }
360 }
361 }
362
363 return Graph.BaseAddress;
364 }
365
printInstruction(const Instr & InstrMeta,raw_ostream & OS) const366 void FileAnalysis::printInstruction(const Instr &InstrMeta,
367 raw_ostream &OS) const {
368 Printer->printInst(&InstrMeta.Instruction, 0, "", *SubtargetInfo.get(), OS);
369 }
370
initialiseDisassemblyMembers()371 Error FileAnalysis::initialiseDisassemblyMembers() {
372 std::string TripleName = ObjectTriple.getTriple();
373 ArchName = "";
374 MCPU = "";
375 std::string ErrorString;
376
377 Symbolizer.reset(new LLVMSymbolizer());
378
379 ObjectTarget =
380 TargetRegistry::lookupTarget(ArchName, ObjectTriple, ErrorString);
381 if (!ObjectTarget)
382 return make_error<UnsupportedDisassembly>(
383 (Twine("Couldn't find target \"") + ObjectTriple.getTriple() +
384 "\", failed with error: " + ErrorString)
385 .str());
386
387 RegisterInfo.reset(ObjectTarget->createMCRegInfo(TripleName));
388 if (!RegisterInfo)
389 return make_error<UnsupportedDisassembly>(
390 "Failed to initialise RegisterInfo.");
391
392 MCTargetOptions MCOptions;
393 AsmInfo.reset(
394 ObjectTarget->createMCAsmInfo(*RegisterInfo, TripleName, MCOptions));
395 if (!AsmInfo)
396 return make_error<UnsupportedDisassembly>("Failed to initialise AsmInfo.");
397
398 SubtargetInfo.reset(ObjectTarget->createMCSubtargetInfo(
399 TripleName, MCPU, Features.getString()));
400 if (!SubtargetInfo)
401 return make_error<UnsupportedDisassembly>(
402 "Failed to initialise SubtargetInfo.");
403
404 MII.reset(ObjectTarget->createMCInstrInfo());
405 if (!MII)
406 return make_error<UnsupportedDisassembly>("Failed to initialise MII.");
407
408 Context.reset(new MCContext(AsmInfo.get(), RegisterInfo.get(), &MOFI));
409
410 Disassembler.reset(
411 ObjectTarget->createMCDisassembler(*SubtargetInfo, *Context));
412
413 if (!Disassembler)
414 return make_error<UnsupportedDisassembly>(
415 "No disassembler available for target");
416
417 MIA.reset(ObjectTarget->createMCInstrAnalysis(MII.get()));
418
419 Printer.reset(ObjectTarget->createMCInstPrinter(
420 ObjectTriple, AsmInfo->getAssemblerDialect(), *AsmInfo, *MII,
421 *RegisterInfo));
422
423 return Error::success();
424 }
425
parseCodeSections()426 Error FileAnalysis::parseCodeSections() {
427 if (!IgnoreDWARFFlag) {
428 std::unique_ptr<DWARFContext> DWARF = DWARFContext::create(*Object);
429 if (!DWARF)
430 return make_error<StringError>("Could not create DWARF information.",
431 inconvertibleErrorCode());
432
433 bool LineInfoValid = false;
434
435 for (auto &Unit : DWARF->compile_units()) {
436 const auto &LineTable = DWARF->getLineTableForUnit(Unit.get());
437 if (LineTable && !LineTable->Rows.empty()) {
438 LineInfoValid = true;
439 break;
440 }
441 }
442
443 if (!LineInfoValid)
444 return make_error<StringError>(
445 "DWARF line information missing. Did you compile with '-g'?",
446 inconvertibleErrorCode());
447 }
448
449 for (const object::SectionRef &Section : Object->sections()) {
450 // Ensure only executable sections get analysed.
451 if (!(object::ELFSectionRef(Section).getFlags() & ELF::SHF_EXECINSTR))
452 continue;
453
454 // Avoid checking the PLT since it produces spurious failures on AArch64
455 // when ignoring DWARF data.
456 Expected<StringRef> NameOrErr = Section.getName();
457 if (NameOrErr && *NameOrErr == ".plt")
458 continue;
459 consumeError(NameOrErr.takeError());
460
461 Expected<StringRef> Contents = Section.getContents();
462 if (!Contents)
463 return Contents.takeError();
464 ArrayRef<uint8_t> SectionBytes = arrayRefFromStringRef(*Contents);
465
466 parseSectionContents(SectionBytes,
467 {Section.getAddress(), Section.getIndex()});
468 }
469 return Error::success();
470 }
471
parseSectionContents(ArrayRef<uint8_t> SectionBytes,object::SectionedAddress Address)472 void FileAnalysis::parseSectionContents(ArrayRef<uint8_t> SectionBytes,
473 object::SectionedAddress Address) {
474 assert(Symbolizer && "Symbolizer is uninitialised.");
475 MCInst Instruction;
476 Instr InstrMeta;
477 uint64_t InstructionSize;
478
479 for (uint64_t Byte = 0; Byte < SectionBytes.size();) {
480 bool ValidInstruction =
481 Disassembler->getInstruction(Instruction, InstructionSize,
482 SectionBytes.drop_front(Byte), 0,
483 outs()) == MCDisassembler::Success;
484
485 Byte += InstructionSize;
486
487 uint64_t VMAddress = Address.Address + Byte - InstructionSize;
488 InstrMeta.Instruction = Instruction;
489 InstrMeta.VMAddress = VMAddress;
490 InstrMeta.InstructionSize = InstructionSize;
491 InstrMeta.Valid = ValidInstruction;
492
493 addInstruction(InstrMeta);
494
495 if (!ValidInstruction)
496 continue;
497
498 // Skip additional parsing for instructions that do not affect the control
499 // flow.
500 const auto &InstrDesc = MII->get(Instruction.getOpcode());
501 if (!InstrDesc.mayAffectControlFlow(Instruction, *RegisterInfo))
502 continue;
503
504 uint64_t Target;
505 if (MIA->evaluateBranch(Instruction, VMAddress, InstructionSize, Target)) {
506 // If the target can be evaluated, it's not indirect.
507 StaticBranchTargetings[Target].push_back(VMAddress);
508 continue;
509 }
510
511 if (!usesRegisterOperand(InstrMeta))
512 continue;
513
514 if (InstrDesc.isReturn())
515 continue;
516
517 // Check if this instruction exists in the range of the DWARF metadata.
518 if (!IgnoreDWARFFlag) {
519 auto LineInfo =
520 Symbolizer->symbolizeCode(std::string(Object->getFileName()),
521 {VMAddress, Address.SectionIndex});
522 if (!LineInfo) {
523 handleAllErrors(LineInfo.takeError(), [](const ErrorInfoBase &E) {
524 errs() << "Symbolizer failed to get line: " << E.message() << "\n";
525 });
526 continue;
527 }
528
529 if (LineInfo->FileName == DILineInfo::BadString)
530 continue;
531 }
532
533 IndirectInstructions.insert({VMAddress, Address.SectionIndex});
534 }
535 }
536
addInstruction(const Instr & Instruction)537 void FileAnalysis::addInstruction(const Instr &Instruction) {
538 const auto &KV =
539 Instructions.insert(std::make_pair(Instruction.VMAddress, Instruction));
540 if (!KV.second) {
541 errs() << "Failed to add instruction at address "
542 << format_hex(Instruction.VMAddress, 2)
543 << ": Instruction at this address already exists.\n";
544 exit(EXIT_FAILURE);
545 }
546 }
547
parseSymbolTable()548 Error FileAnalysis::parseSymbolTable() {
549 // Functions that will trap on CFI violations.
550 SmallSet<StringRef, 4> TrapOnFailFunctions;
551 TrapOnFailFunctions.insert("__cfi_slowpath");
552 TrapOnFailFunctions.insert("__cfi_slowpath_diag");
553 TrapOnFailFunctions.insert("abort");
554
555 // Look through the list of symbols for functions that will trap on CFI
556 // violations.
557 for (auto &Sym : Object->symbols()) {
558 auto SymNameOrErr = Sym.getName();
559 if (!SymNameOrErr)
560 consumeError(SymNameOrErr.takeError());
561 else if (TrapOnFailFunctions.contains(*SymNameOrErr)) {
562 auto AddrOrErr = Sym.getAddress();
563 if (!AddrOrErr)
564 consumeError(AddrOrErr.takeError());
565 else
566 TrapOnFailFunctionAddresses.insert(*AddrOrErr);
567 }
568 }
569 if (auto *ElfObject = dyn_cast<object::ELFObjectFileBase>(Object)) {
570 for (const auto &Addr : ElfObject->getPltAddresses()) {
571 if (!Addr.first)
572 continue;
573 object::SymbolRef Sym(*Addr.first, Object);
574 auto SymNameOrErr = Sym.getName();
575 if (!SymNameOrErr)
576 consumeError(SymNameOrErr.takeError());
577 else if (TrapOnFailFunctions.contains(*SymNameOrErr))
578 TrapOnFailFunctionAddresses.insert(Addr.second);
579 }
580 }
581 return Error::success();
582 }
583
UnsupportedDisassembly(StringRef Text)584 UnsupportedDisassembly::UnsupportedDisassembly(StringRef Text)
585 : Text(std::string(Text)) {}
586
587 char UnsupportedDisassembly::ID;
log(raw_ostream & OS) const588 void UnsupportedDisassembly::log(raw_ostream &OS) const {
589 OS << "Could not initialise disassembler: " << Text;
590 }
591
convertToErrorCode() const592 std::error_code UnsupportedDisassembly::convertToErrorCode() const {
593 return std::error_code();
594 }
595
596 } // namespace cfi_verify
597 } // namespace llvm
598