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.count(Target) > 0;
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(Object->getFileName(), Address);
278 }
279
280 CFIProtectionStatus
validateCFIProtection(const GraphResult & Graph) const281 FileAnalysis::validateCFIProtection(const GraphResult &Graph) const {
282 const Instr *InstrMetaPtr = getInstruction(Graph.BaseAddress);
283 if (!InstrMetaPtr)
284 return CFIProtectionStatus::FAIL_INVALID_INSTRUCTION;
285
286 const auto &InstrDesc = MII->get(InstrMetaPtr->Instruction.getOpcode());
287 if (!InstrDesc.mayAffectControlFlow(InstrMetaPtr->Instruction, *RegisterInfo))
288 return CFIProtectionStatus::FAIL_NOT_INDIRECT_CF;
289
290 if (!usesRegisterOperand(*InstrMetaPtr))
291 return CFIProtectionStatus::FAIL_NOT_INDIRECT_CF;
292
293 if (!Graph.OrphanedNodes.empty())
294 return CFIProtectionStatus::FAIL_ORPHANS;
295
296 for (const auto &BranchNode : Graph.ConditionalBranchNodes) {
297 if (!BranchNode.CFIProtection)
298 return CFIProtectionStatus::FAIL_BAD_CONDITIONAL_BRANCH;
299 }
300
301 if (indirectCFOperandClobber(Graph) != Graph.BaseAddress)
302 return CFIProtectionStatus::FAIL_REGISTER_CLOBBERED;
303
304 return CFIProtectionStatus::PROTECTED;
305 }
306
indirectCFOperandClobber(const GraphResult & Graph) const307 uint64_t FileAnalysis::indirectCFOperandClobber(const GraphResult &Graph) const {
308 assert(Graph.OrphanedNodes.empty() && "Orphaned nodes should be empty.");
309
310 // Get the set of registers we must check to ensure they're not clobbered.
311 const Instr &IndirectCF = getInstructionOrDie(Graph.BaseAddress);
312 DenseSet<unsigned> RegisterNumbers;
313 for (const auto &Operand : IndirectCF.Instruction) {
314 if (Operand.isReg())
315 RegisterNumbers.insert(Operand.getReg());
316 }
317 assert(RegisterNumbers.size() && "Zero register operands on indirect CF.");
318
319 // Now check all branches to indirect CFs and ensure no clobbering happens.
320 for (const auto &Branch : Graph.ConditionalBranchNodes) {
321 uint64_t Node;
322 if (Branch.IndirectCFIsOnTargetPath)
323 Node = Branch.Target;
324 else
325 Node = Branch.Fallthrough;
326
327 // Some architectures (e.g., AArch64) cannot load in an indirect branch, so
328 // we allow them one load.
329 bool canLoad = !MII->get(IndirectCF.Instruction.getOpcode()).mayLoad();
330
331 // We walk backwards from the indirect CF. It is the last node returned by
332 // Graph.flattenAddress, so we skip it since we already handled it.
333 DenseSet<unsigned> CurRegisterNumbers = RegisterNumbers;
334 std::vector<uint64_t> Nodes = Graph.flattenAddress(Node);
335 for (auto I = Nodes.rbegin() + 1, E = Nodes.rend(); I != E; ++I) {
336 Node = *I;
337 const Instr &NodeInstr = getInstructionOrDie(Node);
338 const auto &InstrDesc = MII->get(NodeInstr.Instruction.getOpcode());
339
340 for (auto RI = CurRegisterNumbers.begin(), RE = CurRegisterNumbers.end();
341 RI != RE; ++RI) {
342 unsigned RegNum = *RI;
343 if (InstrDesc.hasDefOfPhysReg(NodeInstr.Instruction, RegNum,
344 *RegisterInfo)) {
345 if (!canLoad || !InstrDesc.mayLoad())
346 return Node;
347 canLoad = false;
348 CurRegisterNumbers.erase(RI);
349 // Add the registers this load reads to those we check for clobbers.
350 for (unsigned i = InstrDesc.getNumDefs(),
351 e = InstrDesc.getNumOperands(); i != e; i++) {
352 const auto Operand = NodeInstr.Instruction.getOperand(i);
353 if (Operand.isReg())
354 CurRegisterNumbers.insert(Operand.getReg());
355 }
356 break;
357 }
358 }
359 }
360 }
361
362 return Graph.BaseAddress;
363 }
364
printInstruction(const Instr & InstrMeta,raw_ostream & OS) const365 void FileAnalysis::printInstruction(const Instr &InstrMeta,
366 raw_ostream &OS) const {
367 Printer->printInst(&InstrMeta.Instruction, 0, "", *SubtargetInfo.get(), OS);
368 }
369
initialiseDisassemblyMembers()370 Error FileAnalysis::initialiseDisassemblyMembers() {
371 std::string TripleName = ObjectTriple.getTriple();
372 ArchName = "";
373 MCPU = "";
374 std::string ErrorString;
375
376 Symbolizer.reset(new LLVMSymbolizer());
377
378 ObjectTarget =
379 TargetRegistry::lookupTarget(ArchName, ObjectTriple, ErrorString);
380 if (!ObjectTarget)
381 return make_error<UnsupportedDisassembly>(
382 (Twine("Couldn't find target \"") + ObjectTriple.getTriple() +
383 "\", failed with error: " + ErrorString)
384 .str());
385
386 RegisterInfo.reset(ObjectTarget->createMCRegInfo(TripleName));
387 if (!RegisterInfo)
388 return make_error<UnsupportedDisassembly>(
389 "Failed to initialise RegisterInfo.");
390
391 MCTargetOptions MCOptions;
392 AsmInfo.reset(
393 ObjectTarget->createMCAsmInfo(*RegisterInfo, TripleName, MCOptions));
394 if (!AsmInfo)
395 return make_error<UnsupportedDisassembly>("Failed to initialise AsmInfo.");
396
397 SubtargetInfo.reset(ObjectTarget->createMCSubtargetInfo(
398 TripleName, MCPU, Features.getString()));
399 if (!SubtargetInfo)
400 return make_error<UnsupportedDisassembly>(
401 "Failed to initialise SubtargetInfo.");
402
403 MII.reset(ObjectTarget->createMCInstrInfo());
404 if (!MII)
405 return make_error<UnsupportedDisassembly>("Failed to initialise MII.");
406
407 Context.reset(new MCContext(AsmInfo.get(), RegisterInfo.get(), &MOFI));
408
409 Disassembler.reset(
410 ObjectTarget->createMCDisassembler(*SubtargetInfo, *Context));
411
412 if (!Disassembler)
413 return make_error<UnsupportedDisassembly>(
414 "No disassembler available for target");
415
416 MIA.reset(ObjectTarget->createMCInstrAnalysis(MII.get()));
417
418 Printer.reset(ObjectTarget->createMCInstPrinter(
419 ObjectTriple, AsmInfo->getAssemblerDialect(), *AsmInfo, *MII,
420 *RegisterInfo));
421
422 return Error::success();
423 }
424
parseCodeSections()425 Error FileAnalysis::parseCodeSections() {
426 if (!IgnoreDWARFFlag) {
427 std::unique_ptr<DWARFContext> DWARF = DWARFContext::create(*Object);
428 if (!DWARF)
429 return make_error<StringError>("Could not create DWARF information.",
430 inconvertibleErrorCode());
431
432 bool LineInfoValid = false;
433
434 for (auto &Unit : DWARF->compile_units()) {
435 const auto &LineTable = DWARF->getLineTableForUnit(Unit.get());
436 if (LineTable && !LineTable->Rows.empty()) {
437 LineInfoValid = true;
438 break;
439 }
440 }
441
442 if (!LineInfoValid)
443 return make_error<StringError>(
444 "DWARF line information missing. Did you compile with '-g'?",
445 inconvertibleErrorCode());
446 }
447
448 for (const object::SectionRef &Section : Object->sections()) {
449 // Ensure only executable sections get analysed.
450 if (!(object::ELFSectionRef(Section).getFlags() & ELF::SHF_EXECINSTR))
451 continue;
452
453 // Avoid checking the PLT since it produces spurious failures on AArch64
454 // when ignoring DWARF data.
455 Expected<StringRef> NameOrErr = Section.getName();
456 if (NameOrErr && *NameOrErr == ".plt")
457 continue;
458 consumeError(NameOrErr.takeError());
459
460 Expected<StringRef> Contents = Section.getContents();
461 if (!Contents)
462 return Contents.takeError();
463 ArrayRef<uint8_t> SectionBytes = arrayRefFromStringRef(*Contents);
464
465 parseSectionContents(SectionBytes,
466 {Section.getAddress(), Section.getIndex()});
467 }
468 return Error::success();
469 }
470
parseSectionContents(ArrayRef<uint8_t> SectionBytes,object::SectionedAddress Address)471 void FileAnalysis::parseSectionContents(ArrayRef<uint8_t> SectionBytes,
472 object::SectionedAddress Address) {
473 assert(Symbolizer && "Symbolizer is uninitialised.");
474 MCInst Instruction;
475 Instr InstrMeta;
476 uint64_t InstructionSize;
477
478 for (uint64_t Byte = 0; Byte < SectionBytes.size();) {
479 bool ValidInstruction =
480 Disassembler->getInstruction(Instruction, InstructionSize,
481 SectionBytes.drop_front(Byte), 0,
482 outs()) == MCDisassembler::Success;
483
484 Byte += InstructionSize;
485
486 uint64_t VMAddress = Address.Address + Byte - InstructionSize;
487 InstrMeta.Instruction = Instruction;
488 InstrMeta.VMAddress = VMAddress;
489 InstrMeta.InstructionSize = InstructionSize;
490 InstrMeta.Valid = ValidInstruction;
491
492 addInstruction(InstrMeta);
493
494 if (!ValidInstruction)
495 continue;
496
497 // Skip additional parsing for instructions that do not affect the control
498 // flow.
499 const auto &InstrDesc = MII->get(Instruction.getOpcode());
500 if (!InstrDesc.mayAffectControlFlow(Instruction, *RegisterInfo))
501 continue;
502
503 uint64_t Target;
504 if (MIA->evaluateBranch(Instruction, VMAddress, InstructionSize, Target)) {
505 // If the target can be evaluated, it's not indirect.
506 StaticBranchTargetings[Target].push_back(VMAddress);
507 continue;
508 }
509
510 if (!usesRegisterOperand(InstrMeta))
511 continue;
512
513 if (InstrDesc.isReturn())
514 continue;
515
516 // Check if this instruction exists in the range of the DWARF metadata.
517 if (!IgnoreDWARFFlag) {
518 auto LineInfo = Symbolizer->symbolizeCode(
519 Object->getFileName(), {VMAddress, Address.SectionIndex});
520 if (!LineInfo) {
521 handleAllErrors(LineInfo.takeError(), [](const ErrorInfoBase &E) {
522 errs() << "Symbolizer failed to get line: " << E.message() << "\n";
523 });
524 continue;
525 }
526
527 if (LineInfo->FileName == DILineInfo::BadString)
528 continue;
529 }
530
531 IndirectInstructions.insert({VMAddress, Address.SectionIndex});
532 }
533 }
534
addInstruction(const Instr & Instruction)535 void FileAnalysis::addInstruction(const Instr &Instruction) {
536 const auto &KV =
537 Instructions.insert(std::make_pair(Instruction.VMAddress, Instruction));
538 if (!KV.second) {
539 errs() << "Failed to add instruction at address "
540 << format_hex(Instruction.VMAddress, 2)
541 << ": Instruction at this address already exists.\n";
542 exit(EXIT_FAILURE);
543 }
544 }
545
parseSymbolTable()546 Error FileAnalysis::parseSymbolTable() {
547 // Functions that will trap on CFI violations.
548 SmallSet<StringRef, 4> TrapOnFailFunctions;
549 TrapOnFailFunctions.insert("__cfi_slowpath");
550 TrapOnFailFunctions.insert("__cfi_slowpath_diag");
551 TrapOnFailFunctions.insert("abort");
552
553 // Look through the list of symbols for functions that will trap on CFI
554 // violations.
555 for (auto &Sym : Object->symbols()) {
556 auto SymNameOrErr = Sym.getName();
557 if (!SymNameOrErr)
558 consumeError(SymNameOrErr.takeError());
559 else if (TrapOnFailFunctions.count(*SymNameOrErr) > 0) {
560 auto AddrOrErr = Sym.getAddress();
561 if (!AddrOrErr)
562 consumeError(AddrOrErr.takeError());
563 else
564 TrapOnFailFunctionAddresses.insert(*AddrOrErr);
565 }
566 }
567 if (auto *ElfObject = dyn_cast<object::ELFObjectFileBase>(Object)) {
568 for (const auto &Addr : ElfObject->getPltAddresses()) {
569 object::SymbolRef Sym(Addr.first, Object);
570 auto SymNameOrErr = Sym.getName();
571 if (!SymNameOrErr)
572 consumeError(SymNameOrErr.takeError());
573 else if (TrapOnFailFunctions.count(*SymNameOrErr) > 0)
574 TrapOnFailFunctionAddresses.insert(Addr.second);
575 }
576 }
577 return Error::success();
578 }
579
UnsupportedDisassembly(StringRef Text)580 UnsupportedDisassembly::UnsupportedDisassembly(StringRef Text) : Text(Text) {}
581
582 char UnsupportedDisassembly::ID;
log(raw_ostream & OS) const583 void UnsupportedDisassembly::log(raw_ostream &OS) const {
584 OS << "Could not initialise disassembler: " << Text;
585 }
586
convertToErrorCode() const587 std::error_code UnsupportedDisassembly::convertToErrorCode() const {
588 return std::error_code();
589 }
590
591 } // namespace cfi_verify
592 } // namespace llvm
593