LLVM  7.0.0svn
SanitizerCoverage.cpp
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1 //===-- SanitizerCoverage.cpp - coverage instrumentation for sanitizers ---===//
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 // Coverage instrumentation done on LLVM IR level, works with Sanitizers.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/ADT/ArrayRef.h"
15 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/IR/CFG.h"
19 #include "llvm/IR/CallSite.h"
20 #include "llvm/IR/Constant.h"
21 #include "llvm/IR/DataLayout.h"
22 #include "llvm/IR/DebugInfo.h"
23 #include "llvm/IR/Dominators.h"
24 #include "llvm/IR/Function.h"
25 #include "llvm/IR/GlobalVariable.h"
26 #include "llvm/IR/IRBuilder.h"
27 #include "llvm/IR/InlineAsm.h"
28 #include "llvm/IR/IntrinsicInst.h"
29 #include "llvm/IR/Intrinsics.h"
30 #include "llvm/IR/LLVMContext.h"
31 #include "llvm/IR/MDBuilder.h"
32 #include "llvm/IR/Module.h"
33 #include "llvm/IR/Type.h"
35 #include "llvm/Support/Debug.h"
40 
41 using namespace llvm;
42 
43 #define DEBUG_TYPE "sancov"
44 
45 static const char *const SanCovTracePCIndirName =
46  "__sanitizer_cov_trace_pc_indir";
47 static const char *const SanCovTracePCName = "__sanitizer_cov_trace_pc";
48 static const char *const SanCovTraceCmp1 = "__sanitizer_cov_trace_cmp1";
49 static const char *const SanCovTraceCmp2 = "__sanitizer_cov_trace_cmp2";
50 static const char *const SanCovTraceCmp4 = "__sanitizer_cov_trace_cmp4";
51 static const char *const SanCovTraceCmp8 = "__sanitizer_cov_trace_cmp8";
52 static const char *const SanCovTraceConstCmp1 =
53  "__sanitizer_cov_trace_const_cmp1";
54 static const char *const SanCovTraceConstCmp2 =
55  "__sanitizer_cov_trace_const_cmp2";
56 static const char *const SanCovTraceConstCmp4 =
57  "__sanitizer_cov_trace_const_cmp4";
58 static const char *const SanCovTraceConstCmp8 =
59  "__sanitizer_cov_trace_const_cmp8";
60 static const char *const SanCovTraceDiv4 = "__sanitizer_cov_trace_div4";
61 static const char *const SanCovTraceDiv8 = "__sanitizer_cov_trace_div8";
62 static const char *const SanCovTraceGep = "__sanitizer_cov_trace_gep";
63 static const char *const SanCovTraceSwitchName = "__sanitizer_cov_trace_switch";
64 static const char *const SanCovModuleCtorName = "sancov.module_ctor";
65 static const uint64_t SanCtorAndDtorPriority = 2;
66 
67 static const char *const SanCovTracePCGuardName =
68  "__sanitizer_cov_trace_pc_guard";
69 static const char *const SanCovTracePCGuardInitName =
70  "__sanitizer_cov_trace_pc_guard_init";
71 static const char *const SanCov8bitCountersInitName =
72  "__sanitizer_cov_8bit_counters_init";
73 static const char *const SanCovPCsInitName = "__sanitizer_cov_pcs_init";
74 
75 static const char *const SanCovGuardsSectionName = "sancov_guards";
76 static const char *const SanCovCountersSectionName = "sancov_cntrs";
77 static const char *const SanCovPCsSectionName = "sancov_pcs";
78 
79 static const char *const SanCovLowestStackName = "__sancov_lowest_stack";
80 
82  "sanitizer-coverage-level",
83  cl::desc("Sanitizer Coverage. 0: none, 1: entry block, 2: all blocks, "
84  "3: all blocks and critical edges"),
85  cl::Hidden, cl::init(0));
86 
87 static cl::opt<bool> ClTracePC("sanitizer-coverage-trace-pc",
88  cl::desc("Experimental pc tracing"), cl::Hidden,
89  cl::init(false));
90 
91 static cl::opt<bool> ClTracePCGuard("sanitizer-coverage-trace-pc-guard",
92  cl::desc("pc tracing with a guard"),
93  cl::Hidden, cl::init(false));
94 
95 // If true, we create a global variable that contains PCs of all instrumented
96 // BBs, put this global into a named section, and pass this section's bounds
97 // to __sanitizer_cov_pcs_init.
98 // This way the coverage instrumentation does not need to acquire the PCs
99 // at run-time. Works with trace-pc-guard and inline-8bit-counters.
100 static cl::opt<bool> ClCreatePCTable("sanitizer-coverage-pc-table",
101  cl::desc("create a static PC table"),
102  cl::Hidden, cl::init(false));
103 
104 static cl::opt<bool>
105  ClInline8bitCounters("sanitizer-coverage-inline-8bit-counters",
106  cl::desc("increments 8-bit counter for every edge"),
107  cl::Hidden, cl::init(false));
108 
109 static cl::opt<bool>
110  ClCMPTracing("sanitizer-coverage-trace-compares",
111  cl::desc("Tracing of CMP and similar instructions"),
112  cl::Hidden, cl::init(false));
113 
114 static cl::opt<bool> ClDIVTracing("sanitizer-coverage-trace-divs",
115  cl::desc("Tracing of DIV instructions"),
116  cl::Hidden, cl::init(false));
117 
118 static cl::opt<bool> ClGEPTracing("sanitizer-coverage-trace-geps",
119  cl::desc("Tracing of GEP instructions"),
120  cl::Hidden, cl::init(false));
121 
122 static cl::opt<bool>
123  ClPruneBlocks("sanitizer-coverage-prune-blocks",
124  cl::desc("Reduce the number of instrumented blocks"),
125  cl::Hidden, cl::init(true));
126 
127 static cl::opt<bool> ClStackDepth("sanitizer-coverage-stack-depth",
128  cl::desc("max stack depth tracing"),
129  cl::Hidden, cl::init(false));
130 
131 namespace {
132 
133 SanitizerCoverageOptions getOptions(int LegacyCoverageLevel) {
135  switch (LegacyCoverageLevel) {
136  case 0:
138  break;
139  case 1:
141  break;
142  case 2:
144  break;
145  case 3:
147  break;
148  case 4:
150  Res.IndirectCalls = true;
151  break;
152  }
153  return Res;
154 }
155 
156 SanitizerCoverageOptions OverrideFromCL(SanitizerCoverageOptions Options) {
157  // Sets CoverageType and IndirectCalls.
158  SanitizerCoverageOptions CLOpts = getOptions(ClCoverageLevel);
159  Options.CoverageType = std::max(Options.CoverageType, CLOpts.CoverageType);
160  Options.IndirectCalls |= CLOpts.IndirectCalls;
161  Options.TraceCmp |= ClCMPTracing;
162  Options.TraceDiv |= ClDIVTracing;
163  Options.TraceGep |= ClGEPTracing;
164  Options.TracePC |= ClTracePC;
165  Options.TracePCGuard |= ClTracePCGuard;
167  Options.PCTable |= ClCreatePCTable;
168  Options.NoPrune |= !ClPruneBlocks;
169  Options.StackDepth |= ClStackDepth;
170  if (!Options.TracePCGuard && !Options.TracePC &&
171  !Options.Inline8bitCounters && !Options.StackDepth)
172  Options.TracePCGuard = true; // TracePCGuard is default.
173  return Options;
174 }
175 
176 class SanitizerCoverageModule : public ModulePass {
177 public:
178  SanitizerCoverageModule(
180  : ModulePass(ID), Options(OverrideFromCL(Options)) {
182  }
183  bool runOnModule(Module &M) override;
184  bool runOnFunction(Function &F);
185  static char ID; // Pass identification, replacement for typeid
186  StringRef getPassName() const override { return "SanitizerCoverageModule"; }
187 
188  void getAnalysisUsage(AnalysisUsage &AU) const override {
191  }
192 
193 private:
194  void InjectCoverageForIndirectCalls(Function &F,
195  ArrayRef<Instruction *> IndirCalls);
196  void InjectTraceForCmp(Function &F, ArrayRef<Instruction *> CmpTraceTargets);
197  void InjectTraceForDiv(Function &F,
198  ArrayRef<BinaryOperator *> DivTraceTargets);
199  void InjectTraceForGep(Function &F,
200  ArrayRef<GetElementPtrInst *> GepTraceTargets);
201  void InjectTraceForSwitch(Function &F,
202  ArrayRef<Instruction *> SwitchTraceTargets);
203  bool InjectCoverage(Function &F, ArrayRef<BasicBlock *> AllBlocks,
204  bool IsLeafFunc = true);
205  GlobalVariable *CreateFunctionLocalArrayInSection(size_t NumElements,
206  Function &F, Type *Ty,
207  const char *Section);
208  GlobalVariable *CreatePCArray(Function &F, ArrayRef<BasicBlock *> AllBlocks);
209  void CreateFunctionLocalArrays(Function &F, ArrayRef<BasicBlock *> AllBlocks);
210  void InjectCoverageAtBlock(Function &F, BasicBlock &BB, size_t Idx,
211  bool IsLeafFunc = true);
212  Function *CreateInitCallsForSections(Module &M, const char *InitFunctionName,
213  Type *Ty, const char *Section);
214  std::pair<GlobalVariable *, GlobalVariable *>
215  CreateSecStartEnd(Module &M, const char *Section, Type *Ty);
216 
217  void SetNoSanitizeMetadata(Instruction *I) {
218  I->setMetadata(I->getModule()->getMDKindID("nosanitize"),
219  MDNode::get(*C, None));
220  }
221 
222  std::string getSectionName(const std::string &Section) const;
223  std::string getSectionStart(const std::string &Section) const;
224  std::string getSectionEnd(const std::string &Section) const;
225  Function *SanCovTracePCIndir;
226  Function *SanCovTracePC, *SanCovTracePCGuard;
227  Function *SanCovTraceCmpFunction[4];
228  Function *SanCovTraceConstCmpFunction[4];
229  Function *SanCovTraceDivFunction[2];
230  Function *SanCovTraceGepFunction;
231  Function *SanCovTraceSwitchFunction;
232  GlobalVariable *SanCovLowestStack;
233  InlineAsm *EmptyAsm;
234  Type *IntptrTy, *IntptrPtrTy, *Int64Ty, *Int64PtrTy, *Int32Ty, *Int32PtrTy,
235  *Int16Ty, *Int8Ty, *Int8PtrTy;
236  Module *CurModule;
237  Triple TargetTriple;
238  LLVMContext *C;
239  const DataLayout *DL;
240 
241  GlobalVariable *FunctionGuardArray; // for trace-pc-guard.
242  GlobalVariable *Function8bitCounterArray; // for inline-8bit-counters.
243  GlobalVariable *FunctionPCsArray; // for pc-table.
244  SmallVector<GlobalValue *, 20> GlobalsToAppendToUsed;
245  SmallVector<GlobalValue *, 20> GlobalsToAppendToCompilerUsed;
246 
247  SanitizerCoverageOptions Options;
248 };
249 
250 } // namespace
251 
252 std::pair<GlobalVariable *, GlobalVariable *>
253 SanitizerCoverageModule::CreateSecStartEnd(Module &M, const char *Section,
254  Type *Ty) {
255  GlobalVariable *SecStart =
256  new GlobalVariable(M, Ty, false, GlobalVariable::ExternalLinkage, nullptr,
257  getSectionStart(Section));
259  GlobalVariable *SecEnd =
261  nullptr, getSectionEnd(Section));
263 
264  return std::make_pair(SecStart, SecEnd);
265 }
266 
267 
268 Function *SanitizerCoverageModule::CreateInitCallsForSections(
269  Module &M, const char *InitFunctionName, Type *Ty,
270  const char *Section) {
271  IRBuilder<> IRB(M.getContext());
272  auto SecStartEnd = CreateSecStartEnd(M, Section, Ty);
273  auto SecStart = SecStartEnd.first;
274  auto SecEnd = SecStartEnd.second;
275  Function *CtorFunc;
276  std::tie(CtorFunc, std::ignore) = createSanitizerCtorAndInitFunctions(
277  M, SanCovModuleCtorName, InitFunctionName, {Ty, Ty},
278  {IRB.CreatePointerCast(SecStart, Ty), IRB.CreatePointerCast(SecEnd, Ty)});
279 
280  if (TargetTriple.supportsCOMDAT()) {
281  // Use comdat to dedup CtorFunc.
282  CtorFunc->setComdat(M.getOrInsertComdat(SanCovModuleCtorName));
283  appendToGlobalCtors(M, CtorFunc, SanCtorAndDtorPriority, CtorFunc);
284  } else {
286  }
287  return CtorFunc;
288 }
289 
290 bool SanitizerCoverageModule::runOnModule(Module &M) {
292  return false;
293  C = &(M.getContext());
294  DL = &M.getDataLayout();
295  CurModule = &M;
296  TargetTriple = Triple(M.getTargetTriple());
297  FunctionGuardArray = nullptr;
298  Function8bitCounterArray = nullptr;
299  FunctionPCsArray = nullptr;
300  IntptrTy = Type::getIntNTy(*C, DL->getPointerSizeInBits());
301  IntptrPtrTy = PointerType::getUnqual(IntptrTy);
302  Type *VoidTy = Type::getVoidTy(*C);
303  IRBuilder<> IRB(*C);
304  Int64PtrTy = PointerType::getUnqual(IRB.getInt64Ty());
305  Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
306  Int8PtrTy = PointerType::getUnqual(IRB.getInt8Ty());
307  Int64Ty = IRB.getInt64Ty();
308  Int32Ty = IRB.getInt32Ty();
309  Int16Ty = IRB.getInt16Ty();
310  Int8Ty = IRB.getInt8Ty();
311 
312  SanCovTracePCIndir = checkSanitizerInterfaceFunction(
313  M.getOrInsertFunction(SanCovTracePCIndirName, VoidTy, IntptrTy));
314  SanCovTraceCmpFunction[0] =
316  SanCovTraceCmp1, VoidTy, IRB.getInt8Ty(), IRB.getInt8Ty()));
317  SanCovTraceCmpFunction[1] = checkSanitizerInterfaceFunction(
318  M.getOrInsertFunction(SanCovTraceCmp2, VoidTy, IRB.getInt16Ty(),
319  IRB.getInt16Ty()));
320  SanCovTraceCmpFunction[2] = checkSanitizerInterfaceFunction(
321  M.getOrInsertFunction(SanCovTraceCmp4, VoidTy, IRB.getInt32Ty(),
322  IRB.getInt32Ty()));
323  SanCovTraceCmpFunction[3] =
325  SanCovTraceCmp8, VoidTy, Int64Ty, Int64Ty));
326 
327  SanCovTraceConstCmpFunction[0] =
329  SanCovTraceConstCmp1, VoidTy, Int8Ty, Int8Ty));
330  SanCovTraceConstCmpFunction[1] =
332  SanCovTraceConstCmp2, VoidTy, Int16Ty, Int16Ty));
333  SanCovTraceConstCmpFunction[2] =
335  SanCovTraceConstCmp4, VoidTy, Int32Ty, Int32Ty));
336  SanCovTraceConstCmpFunction[3] =
338  SanCovTraceConstCmp8, VoidTy, Int64Ty, Int64Ty));
339 
340  SanCovTraceDivFunction[0] =
342  SanCovTraceDiv4, VoidTy, IRB.getInt32Ty()));
343  SanCovTraceDivFunction[1] =
345  SanCovTraceDiv8, VoidTy, Int64Ty));
346  SanCovTraceGepFunction =
348  SanCovTraceGep, VoidTy, IntptrTy));
349  SanCovTraceSwitchFunction =
351  SanCovTraceSwitchName, VoidTy, Int64Ty, Int64PtrTy));
352 
353  Constant *SanCovLowestStackConstant =
354  M.getOrInsertGlobal(SanCovLowestStackName, IntptrTy);
355  SanCovLowestStack = cast<GlobalVariable>(SanCovLowestStackConstant);
356  SanCovLowestStack->setThreadLocalMode(
357  GlobalValue::ThreadLocalMode::InitialExecTLSModel);
358  if (Options.StackDepth && !SanCovLowestStack->isDeclaration())
359  SanCovLowestStack->setInitializer(Constant::getAllOnesValue(IntptrTy));
360 
361  // Make sure smaller parameters are zero-extended to i64 as required by the
362  // x86_64 ABI.
363  if (TargetTriple.getArch() == Triple::x86_64) {
364  for (int i = 0; i < 3; i++) {
365  SanCovTraceCmpFunction[i]->addParamAttr(0, Attribute::ZExt);
366  SanCovTraceCmpFunction[i]->addParamAttr(1, Attribute::ZExt);
367  SanCovTraceConstCmpFunction[i]->addParamAttr(0, Attribute::ZExt);
368  SanCovTraceConstCmpFunction[i]->addParamAttr(1, Attribute::ZExt);
369  }
370  SanCovTraceDivFunction[0]->addParamAttr(0, Attribute::ZExt);
371  }
372 
373 
374  // We insert an empty inline asm after cov callbacks to avoid callback merge.
375  EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),
376  StringRef(""), StringRef(""),
377  /*hasSideEffects=*/true);
378 
379  SanCovTracePC = checkSanitizerInterfaceFunction(
380  M.getOrInsertFunction(SanCovTracePCName, VoidTy));
382  SanCovTracePCGuardName, VoidTy, Int32PtrTy));
383 
384  for (auto &F : M)
385  runOnFunction(F);
386 
387  Function *Ctor = nullptr;
388 
389  if (FunctionGuardArray)
390  Ctor = CreateInitCallsForSections(M, SanCovTracePCGuardInitName, Int32PtrTy,
391  SanCovGuardsSectionName);
392  if (Function8bitCounterArray)
393  Ctor = CreateInitCallsForSections(M, SanCov8bitCountersInitName, Int8PtrTy,
394  SanCovCountersSectionName);
395  if (Ctor && Options.PCTable) {
396  auto SecStartEnd = CreateSecStartEnd(M, SanCovPCsSectionName, IntptrPtrTy);
397  Function *InitFunction = declareSanitizerInitFunction(
398  M, SanCovPCsInitName, {IntptrPtrTy, IntptrPtrTy});
399  IRBuilder<> IRBCtor(Ctor->getEntryBlock().getTerminator());
400  IRBCtor.CreateCall(InitFunction,
401  {IRB.CreatePointerCast(SecStartEnd.first, IntptrPtrTy),
402  IRB.CreatePointerCast(SecStartEnd.second, IntptrPtrTy)});
403  }
404  // We don't reference these arrays directly in any of our runtime functions,
405  // so we need to prevent them from being dead stripped.
406  if (TargetTriple.isOSBinFormatMachO())
407  appendToUsed(M, GlobalsToAppendToUsed);
408  appendToCompilerUsed(M, GlobalsToAppendToCompilerUsed);
409  return true;
410 }
411 
412 // True if block has successors and it dominates all of them.
413 static bool isFullDominator(const BasicBlock *BB, const DominatorTree *DT) {
414  if (succ_begin(BB) == succ_end(BB))
415  return false;
416 
417  for (const BasicBlock *SUCC : make_range(succ_begin(BB), succ_end(BB))) {
418  if (!DT->dominates(BB, SUCC))
419  return false;
420  }
421 
422  return true;
423 }
424 
425 // True if block has predecessors and it postdominates all of them.
426 static bool isFullPostDominator(const BasicBlock *BB,
427  const PostDominatorTree *PDT) {
428  if (pred_begin(BB) == pred_end(BB))
429  return false;
430 
431  for (const BasicBlock *PRED : make_range(pred_begin(BB), pred_end(BB))) {
432  if (!PDT->dominates(BB, PRED))
433  return false;
434  }
435 
436  return true;
437 }
438 
439 static bool shouldInstrumentBlock(const Function &F, const BasicBlock *BB,
440  const DominatorTree *DT,
441  const PostDominatorTree *PDT,
442  const SanitizerCoverageOptions &Options) {
443  // Don't insert coverage for unreachable blocks: we will never call
444  // __sanitizer_cov() for them, so counting them in
445  // NumberOfInstrumentedBlocks() might complicate calculation of code coverage
446  // percentage. Also, unreachable instructions frequently have no debug
447  // locations.
448  if (isa<UnreachableInst>(BB->getTerminator()))
449  return false;
450 
451  // Don't insert coverage into blocks without a valid insertion point
452  // (catchswitch blocks).
453  if (BB->getFirstInsertionPt() == BB->end())
454  return false;
455 
456  if (Options.NoPrune || &F.getEntryBlock() == BB)
457  return true;
458 
460  &F.getEntryBlock() != BB)
461  return false;
462 
463  // Do not instrument full dominators, or full post-dominators with multiple
464  // predecessors.
465  return !isFullDominator(BB, DT)
466  && !(isFullPostDominator(BB, PDT) && !BB->getSinglePredecessor());
467 }
468 
470  if (F.empty())
471  return false;
472  if (F.getName().find(".module_ctor") != std::string::npos)
473  return false; // Should not instrument sanitizer init functions.
474  if (F.getName().startswith("__sanitizer_"))
475  return false; // Don't instrument __sanitizer_* callbacks.
476  // Don't touch available_externally functions, their actual body is elewhere.
478  return false;
479  // Don't instrument MSVC CRT configuration helpers. They may run before normal
480  // initialization.
481  if (F.getName() == "__local_stdio_printf_options" ||
482  F.getName() == "__local_stdio_scanf_options")
483  return false;
484  if (isa<UnreachableInst>(F.getEntryBlock().getTerminator()))
485  return false;
486  // Don't instrument functions using SEH for now. Splitting basic blocks like
487  // we do for coverage breaks WinEHPrepare.
488  // FIXME: Remove this when SEH no longer uses landingpad pattern matching.
489  if (F.hasPersonalityFn() &&
491  return false;
495  SmallVector<BasicBlock *, 16> BlocksToInstrument;
496  SmallVector<Instruction *, 8> CmpTraceTargets;
497  SmallVector<Instruction *, 8> SwitchTraceTargets;
498  SmallVector<BinaryOperator *, 8> DivTraceTargets;
499  SmallVector<GetElementPtrInst *, 8> GepTraceTargets;
500 
501  const DominatorTree *DT =
502  &getAnalysis<DominatorTreeWrapperPass>(F).getDomTree();
503  const PostDominatorTree *PDT =
504  &getAnalysis<PostDominatorTreeWrapperPass>(F).getPostDomTree();
505  bool IsLeafFunc = true;
506 
507  for (auto &BB : F) {
508  if (shouldInstrumentBlock(F, &BB, DT, PDT, Options))
509  BlocksToInstrument.push_back(&BB);
510  for (auto &Inst : BB) {
511  if (Options.IndirectCalls) {
512  CallSite CS(&Inst);
513  if (CS && !CS.getCalledFunction())
514  IndirCalls.push_back(&Inst);
515  }
516  if (Options.TraceCmp) {
517  if (isa<ICmpInst>(&Inst))
518  CmpTraceTargets.push_back(&Inst);
519  if (isa<SwitchInst>(&Inst))
520  SwitchTraceTargets.push_back(&Inst);
521  }
522  if (Options.TraceDiv)
523  if (BinaryOperator *BO = dyn_cast<BinaryOperator>(&Inst))
524  if (BO->getOpcode() == Instruction::SDiv ||
525  BO->getOpcode() == Instruction::UDiv)
526  DivTraceTargets.push_back(BO);
527  if (Options.TraceGep)
528  if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&Inst))
529  GepTraceTargets.push_back(GEP);
530  if (Options.StackDepth)
531  if (isa<InvokeInst>(Inst) ||
532  (isa<CallInst>(Inst) && !isa<IntrinsicInst>(Inst)))
533  IsLeafFunc = false;
534  }
535  }
536 
537  InjectCoverage(F, BlocksToInstrument, IsLeafFunc);
538  InjectCoverageForIndirectCalls(F, IndirCalls);
539  InjectTraceForCmp(F, CmpTraceTargets);
540  InjectTraceForSwitch(F, SwitchTraceTargets);
541  InjectTraceForDiv(F, DivTraceTargets);
542  InjectTraceForGep(F, GepTraceTargets);
543  return true;
544 }
545 
546 GlobalVariable *SanitizerCoverageModule::CreateFunctionLocalArrayInSection(
547  size_t NumElements, Function &F, Type *Ty, const char *Section) {
548  ArrayType *ArrayTy = ArrayType::get(Ty, NumElements);
549  auto Array = new GlobalVariable(
550  *CurModule, ArrayTy, false, GlobalVariable::PrivateLinkage,
551  Constant::getNullValue(ArrayTy), "__sancov_gen_");
552  if (auto Comdat = F.getComdat())
553  Array->setComdat(Comdat);
554  Array->setSection(getSectionName(Section));
555  Array->setAlignment(Ty->isPointerTy() ? DL->getPointerSize()
556  : Ty->getPrimitiveSizeInBits() / 8);
557  return Array;
558 }
559 
561 SanitizerCoverageModule::CreatePCArray(Function &F,
562  ArrayRef<BasicBlock *> AllBlocks) {
563  size_t N = AllBlocks.size();
564  assert(N);
567  for (size_t i = 0; i < N; i++) {
568  if (&F.getEntryBlock() == AllBlocks[i]) {
569  PCs.push_back((Constant *)IRB.CreatePointerCast(&F, IntptrPtrTy));
570  PCs.push_back((Constant *)IRB.CreateIntToPtr(
571  ConstantInt::get(IntptrTy, 1), IntptrPtrTy));
572  } else {
573  PCs.push_back((Constant *)IRB.CreatePointerCast(
574  BlockAddress::get(AllBlocks[i]), IntptrPtrTy));
575  PCs.push_back((Constant *)IRB.CreateIntToPtr(
576  ConstantInt::get(IntptrTy, 0), IntptrPtrTy));
577  }
578  }
579  auto *PCArray = CreateFunctionLocalArrayInSection(N * 2, F, IntptrPtrTy,
580  SanCovPCsSectionName);
581  PCArray->setInitializer(
582  ConstantArray::get(ArrayType::get(IntptrPtrTy, N * 2), PCs));
583  PCArray->setConstant(true);
584 
585  return PCArray;
586 }
587 
588 void SanitizerCoverageModule::CreateFunctionLocalArrays(
589  Function &F, ArrayRef<BasicBlock *> AllBlocks) {
590  if (Options.TracePCGuard) {
591  FunctionGuardArray = CreateFunctionLocalArrayInSection(
592  AllBlocks.size(), F, Int32Ty, SanCovGuardsSectionName);
593  GlobalsToAppendToUsed.push_back(FunctionGuardArray);
594  }
595  if (Options.Inline8bitCounters) {
596  Function8bitCounterArray = CreateFunctionLocalArrayInSection(
597  AllBlocks.size(), F, Int8Ty, SanCovCountersSectionName);
598  GlobalsToAppendToCompilerUsed.push_back(Function8bitCounterArray);
600  Function8bitCounterArray->addMetadata(LLVMContext::MD_associated, *MD);
601  }
602  if (Options.PCTable) {
603  FunctionPCsArray = CreatePCArray(F, AllBlocks);
604  GlobalsToAppendToCompilerUsed.push_back(FunctionPCsArray);
606  FunctionPCsArray->addMetadata(LLVMContext::MD_associated, *MD);
607  }
608 }
609 
610 bool SanitizerCoverageModule::InjectCoverage(Function &F,
611  ArrayRef<BasicBlock *> AllBlocks,
612  bool IsLeafFunc) {
613  if (AllBlocks.empty()) return false;
614  CreateFunctionLocalArrays(F, AllBlocks);
615  for (size_t i = 0, N = AllBlocks.size(); i < N; i++)
616  InjectCoverageAtBlock(F, *AllBlocks[i], i, IsLeafFunc);
617  return true;
618 }
619 
620 // On every indirect call we call a run-time function
621 // __sanitizer_cov_indir_call* with two parameters:
622 // - callee address,
623 // - global cache array that contains CacheSize pointers (zero-initialized).
624 // The cache is used to speed up recording the caller-callee pairs.
625 // The address of the caller is passed implicitly via caller PC.
626 // CacheSize is encoded in the name of the run-time function.
627 void SanitizerCoverageModule::InjectCoverageForIndirectCalls(
628  Function &F, ArrayRef<Instruction *> IndirCalls) {
629  if (IndirCalls.empty())
630  return;
631  assert(Options.TracePC || Options.TracePCGuard || Options.Inline8bitCounters);
632  for (auto I : IndirCalls) {
633  IRBuilder<> IRB(I);
634  CallSite CS(I);
635  Value *Callee = CS.getCalledValue();
636  if (isa<InlineAsm>(Callee))
637  continue;
638  IRB.CreateCall(SanCovTracePCIndir, IRB.CreatePointerCast(Callee, IntptrTy));
639  }
640 }
641 
642 // For every switch statement we insert a call:
643 // __sanitizer_cov_trace_switch(CondValue,
644 // {NumCases, ValueSizeInBits, Case0Value, Case1Value, Case2Value, ... })
645 
646 void SanitizerCoverageModule::InjectTraceForSwitch(
647  Function &, ArrayRef<Instruction *> SwitchTraceTargets) {
648  for (auto I : SwitchTraceTargets) {
649  if (SwitchInst *SI = dyn_cast<SwitchInst>(I)) {
650  IRBuilder<> IRB(I);
651  SmallVector<Constant *, 16> Initializers;
652  Value *Cond = SI->getCondition();
653  if (Cond->getType()->getScalarSizeInBits() >
654  Int64Ty->getScalarSizeInBits())
655  continue;
656  Initializers.push_back(ConstantInt::get(Int64Ty, SI->getNumCases()));
657  Initializers.push_back(
658  ConstantInt::get(Int64Ty, Cond->getType()->getScalarSizeInBits()));
659  if (Cond->getType()->getScalarSizeInBits() <
660  Int64Ty->getScalarSizeInBits())
661  Cond = IRB.CreateIntCast(Cond, Int64Ty, false);
662  for (auto It : SI->cases()) {
663  Constant *C = It.getCaseValue();
664  if (C->getType()->getScalarSizeInBits() <
665  Int64Ty->getScalarSizeInBits())
666  C = ConstantExpr::getCast(CastInst::ZExt, It.getCaseValue(), Int64Ty);
667  Initializers.push_back(C);
668  }
669  llvm::sort(Initializers.begin() + 2, Initializers.end(),
670  [](const Constant *A, const Constant *B) {
671  return cast<ConstantInt>(A)->getLimitedValue() <
672  cast<ConstantInt>(B)->getLimitedValue();
673  });
674  ArrayType *ArrayOfInt64Ty = ArrayType::get(Int64Ty, Initializers.size());
675  GlobalVariable *GV = new GlobalVariable(
676  *CurModule, ArrayOfInt64Ty, false, GlobalVariable::InternalLinkage,
677  ConstantArray::get(ArrayOfInt64Ty, Initializers),
678  "__sancov_gen_cov_switch_values");
679  IRB.CreateCall(SanCovTraceSwitchFunction,
680  {Cond, IRB.CreatePointerCast(GV, Int64PtrTy)});
681  }
682  }
683 }
684 
685 void SanitizerCoverageModule::InjectTraceForDiv(
686  Function &, ArrayRef<BinaryOperator *> DivTraceTargets) {
687  for (auto BO : DivTraceTargets) {
688  IRBuilder<> IRB(BO);
689  Value *A1 = BO->getOperand(1);
690  if (isa<ConstantInt>(A1)) continue;
691  if (!A1->getType()->isIntegerTy())
692  continue;
693  uint64_t TypeSize = DL->getTypeStoreSizeInBits(A1->getType());
694  int CallbackIdx = TypeSize == 32 ? 0 :
695  TypeSize == 64 ? 1 : -1;
696  if (CallbackIdx < 0) continue;
697  auto Ty = Type::getIntNTy(*C, TypeSize);
698  IRB.CreateCall(SanCovTraceDivFunction[CallbackIdx],
699  {IRB.CreateIntCast(A1, Ty, true)});
700  }
701 }
702 
703 void SanitizerCoverageModule::InjectTraceForGep(
704  Function &, ArrayRef<GetElementPtrInst *> GepTraceTargets) {
705  for (auto GEP : GepTraceTargets) {
706  IRBuilder<> IRB(GEP);
707  for (auto I = GEP->idx_begin(); I != GEP->idx_end(); ++I)
708  if (!isa<ConstantInt>(*I) && (*I)->getType()->isIntegerTy())
709  IRB.CreateCall(SanCovTraceGepFunction,
710  {IRB.CreateIntCast(*I, IntptrTy, true)});
711  }
712 }
713 
714 void SanitizerCoverageModule::InjectTraceForCmp(
715  Function &, ArrayRef<Instruction *> CmpTraceTargets) {
716  for (auto I : CmpTraceTargets) {
717  if (ICmpInst *ICMP = dyn_cast<ICmpInst>(I)) {
718  IRBuilder<> IRB(ICMP);
719  Value *A0 = ICMP->getOperand(0);
720  Value *A1 = ICMP->getOperand(1);
721  if (!A0->getType()->isIntegerTy())
722  continue;
723  uint64_t TypeSize = DL->getTypeStoreSizeInBits(A0->getType());
724  int CallbackIdx = TypeSize == 8 ? 0 :
725  TypeSize == 16 ? 1 :
726  TypeSize == 32 ? 2 :
727  TypeSize == 64 ? 3 : -1;
728  if (CallbackIdx < 0) continue;
729  // __sanitizer_cov_trace_cmp((type_size << 32) | predicate, A0, A1);
730  auto CallbackFunc = SanCovTraceCmpFunction[CallbackIdx];
731  bool FirstIsConst = isa<ConstantInt>(A0);
732  bool SecondIsConst = isa<ConstantInt>(A1);
733  // If both are const, then we don't need such a comparison.
734  if (FirstIsConst && SecondIsConst) continue;
735  // If only one is const, then make it the first callback argument.
736  if (FirstIsConst || SecondIsConst) {
737  CallbackFunc = SanCovTraceConstCmpFunction[CallbackIdx];
738  if (SecondIsConst)
739  std::swap(A0, A1);
740  }
741 
742  auto Ty = Type::getIntNTy(*C, TypeSize);
743  IRB.CreateCall(CallbackFunc, {IRB.CreateIntCast(A0, Ty, true),
744  IRB.CreateIntCast(A1, Ty, true)});
745  }
746  }
747 }
748 
749 void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
750  size_t Idx,
751  bool IsLeafFunc) {
753  bool IsEntryBB = &BB == &F.getEntryBlock();
754  DebugLoc EntryLoc;
755  if (IsEntryBB) {
756  if (auto SP = F.getSubprogram())
757  EntryLoc = DebugLoc::get(SP->getScopeLine(), 0, SP);
758  // Keep static allocas and llvm.localescape calls in the entry block. Even
759  // if we aren't splitting the block, it's nice for allocas to be before
760  // calls.
761  IP = PrepareToSplitEntryBlock(BB, IP);
762  } else {
763  EntryLoc = IP->getDebugLoc();
764  }
765 
766  IRBuilder<> IRB(&*IP);
767  IRB.SetCurrentDebugLocation(EntryLoc);
768  if (Options.TracePC) {
769  IRB.CreateCall(SanCovTracePC); // gets the PC using GET_CALLER_PC.
770  IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
771  }
772  if (Options.TracePCGuard) {
773  auto GuardPtr = IRB.CreateIntToPtr(
774  IRB.CreateAdd(IRB.CreatePointerCast(FunctionGuardArray, IntptrTy),
775  ConstantInt::get(IntptrTy, Idx * 4)),
776  Int32PtrTy);
777  IRB.CreateCall(SanCovTracePCGuard, GuardPtr);
778  IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
779  }
780  if (Options.Inline8bitCounters) {
781  auto CounterPtr = IRB.CreateGEP(
782  Function8bitCounterArray,
783  {ConstantInt::get(IntptrTy, 0), ConstantInt::get(IntptrTy, Idx)});
784  auto Load = IRB.CreateLoad(CounterPtr);
785  auto Inc = IRB.CreateAdd(Load, ConstantInt::get(Int8Ty, 1));
786  auto Store = IRB.CreateStore(Inc, CounterPtr);
787  SetNoSanitizeMetadata(Load);
788  SetNoSanitizeMetadata(Store);
789  }
790  if (Options.StackDepth && IsEntryBB && !IsLeafFunc) {
791  // Check stack depth. If it's the deepest so far, record it.
792  Function *GetFrameAddr =
793  Intrinsic::getDeclaration(F.getParent(), Intrinsic::frameaddress);
794  auto FrameAddrPtr =
795  IRB.CreateCall(GetFrameAddr, {Constant::getNullValue(Int32Ty)});
796  auto FrameAddrInt = IRB.CreatePtrToInt(FrameAddrPtr, IntptrTy);
797  auto LowestStack = IRB.CreateLoad(SanCovLowestStack);
798  auto IsStackLower = IRB.CreateICmpULT(FrameAddrInt, LowestStack);
799  auto ThenTerm = SplitBlockAndInsertIfThen(IsStackLower, &*IP, false);
800  IRBuilder<> ThenIRB(ThenTerm);
801  auto Store = ThenIRB.CreateStore(FrameAddrInt, SanCovLowestStack);
802  SetNoSanitizeMetadata(LowestStack);
803  SetNoSanitizeMetadata(Store);
804  }
805 }
806 
807 std::string
808 SanitizerCoverageModule::getSectionName(const std::string &Section) const {
809  if (TargetTriple.getObjectFormat() == Triple::COFF)
810  return ".SCOV$M";
811  if (TargetTriple.isOSBinFormatMachO())
812  return "__DATA,__" + Section;
813  return "__" + Section;
814 }
815 
816 std::string
817 SanitizerCoverageModule::getSectionStart(const std::string &Section) const {
818  if (TargetTriple.isOSBinFormatMachO())
819  return "\1section$start$__DATA$__" + Section;
820  return "__start___" + Section;
821 }
822 
823 std::string
824 SanitizerCoverageModule::getSectionEnd(const std::string &Section) const {
825  if (TargetTriple.isOSBinFormatMachO())
826  return "\1section$end$__DATA$__" + Section;
827  return "__stop___" + Section;
828 }
829 
830 
832 INITIALIZE_PASS_BEGIN(SanitizerCoverageModule, "sancov",
833  "SanitizerCoverage: TODO."
834  "ModulePass",
835  false, false)
838 INITIALIZE_PASS_END(SanitizerCoverageModule, "sancov",
839  "SanitizerCoverage: TODO."
840  "ModulePass",
841  false, false)
843  const SanitizerCoverageOptions &Options) {
844  return new SanitizerCoverageModule(Options);
845 }
void setVisibility(VisibilityTypes V)
Definition: GlobalValue.h:238
static const char *const SanCovPCsSectionName
uint64_t CallInst * C
void appendToCompilerUsed(Module &M, ArrayRef< GlobalValue *> Values)
Adds global values to the llvm.compiler.used list.
A parsed version of the target data layout string in and methods for querying it. ...
Definition: DataLayout.h:111
const std::string & getTargetTriple() const
Get the target triple which is a string describing the target host.
Definition: Module.h:238
Function * declareSanitizerInitFunction(Module &M, StringRef InitName, ArrayRef< Type *> InitArgTypes)
bool empty() const
Definition: Function.h:648
static const uint64_t SanCtorAndDtorPriority
DILocation * get() const
Get the underlying DILocation.
Definition: DebugLoc.cpp:22
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
GCNRegPressure max(const GCNRegPressure &P1, const GCNRegPressure &P2)
Function * checkSanitizerInterfaceFunction(Constant *FuncOrBitcast)
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
static const char *const SanCovTraceConstCmp1
Value * CreateICmpULT(Value *LHS, Value *RHS, const Twine &Name="")
Definition: IRBuilder.h:1752
Constant * getOrInsertFunction(StringRef Name, FunctionType *T, AttributeList AttributeList)
Look up the specified function in the module symbol table.
Definition: Module.cpp:142
A Module instance is used to store all the information related to an LLVM module. ...
Definition: Module.h:63
static const char *const SanCovPCsInitName
Available for inspection, not emission.
Definition: GlobalValue.h:50
static bool isFullPostDominator(const BasicBlock *BB, const PostDominatorTree *PDT)
static const char *const SanCovGuardsSectionName
Like Internal, but omit from symbol table.
Definition: GlobalValue.h:57
Externally visible function.
Definition: GlobalValue.h:49
static cl::opt< bool > ClStackDepth("sanitizer-coverage-stack-depth", cl::desc("max stack depth tracing"), cl::Hidden, cl::init(false))
A debug info location.
Definition: DebugLoc.h:34
Metadata node.
Definition: Metadata.h:862
F(f)
static IntegerType * getInt64Ty(LLVMContext &C)
Definition: Type.cpp:177
unsigned SplitAllCriticalEdges(Function &F, const CriticalEdgeSplittingOptions &Options=CriticalEdgeSplittingOptions())
Loop over all of the edges in the CFG, breaking critical edges as they are found. ...
static const char *const SanCovTracePCName
Hexagon Common GEP
static IntegerType * getInt16Ty(LLVMContext &C)
Definition: Type.cpp:175
static const char *const SanCovTraceSwitchName
static const char *const SanCovTraceConstCmp2
static Constant * get(ArrayType *T, ArrayRef< Constant *> V)
Definition: Constants.cpp:960
static Constant * getNullValue(Type *Ty)
Constructor to create a &#39;0&#39; constant of arbitrary type.
Definition: Constants.cpp:268
static const char *const SanCov8bitCountersInitName
AnalysisUsage & addRequired()
#define INITIALIZE_PASS_DEPENDENCY(depName)
Definition: PassSupport.h:51
const DataLayout & getDataLayout() const
Get the data layout for the module&#39;s target platform.
Definition: Module.cpp:361
static const char *const SanCovTraceCmp2
LLVMContext & getContext() const
Get the global data context.
Definition: Module.h:242
bool isIntegerTy() const
True if this is an instance of IntegerType.
Definition: Type.h:197
This provides a uniform API for creating instructions and inserting them into a basic block: either a...
Definition: IRBuilder.h:731
static const char *const SanCovLowestStackName
Value * CreateAdd(Value *LHS, Value *RHS, const Twine &Name="", bool HasNUW=false, bool HasNSW=false)
Definition: IRBuilder.h:962
static cl::opt< int > ClCoverageLevel("sanitizer-coverage-level", cl::desc("Sanitizer Coverage. 0: none, 1: entry block, 2: all blocks, " "3: all blocks and critical edges"), cl::Hidden, cl::init(0))
Interval::succ_iterator succ_begin(Interval *I)
succ_begin/succ_end - define methods so that Intervals may be used just like BasicBlocks can with the...
Definition: Interval.h:103
StoreInst * CreateStore(Value *Val, Value *Ptr, bool isVolatile=false)
Definition: IRBuilder.h:1321
Value * CreateIntToPtr(Value *V, Type *DestTy, const Twine &Name="")
Definition: IRBuilder.h:1624
ValTy * getCalledValue() const
Return the pointer to function that is being called.
Definition: CallSite.h:100
static const char *const SanCovTraceGep
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE bool startswith(StringRef Prefix) const
Check if this string starts with the given Prefix.
Definition: StringRef.h:267
Type * getType() const
All values are typed, get the type of this value.
Definition: Value.h:245
void appendToUsed(Module &M, ArrayRef< GlobalValue *> Values)
Adds global values to the llvm.used list.
static cl::opt< bool > ClDIVTracing("sanitizer-coverage-trace-divs", cl::desc("Tracing of DIV instructions"), cl::Hidden, cl::init(false))
Class to represent array types.
Definition: DerivedTypes.h:369
void setComdat(Comdat *C)
Definition: GlobalObject.h:103
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory)...
Definition: APInt.h:33
static cl::opt< bool > ClCMPTracing("sanitizer-coverage-trace-compares", cl::desc("Tracing of CMP and similar instructions"), cl::Hidden, cl::init(false))
bool hasPersonalityFn() const
Check whether this function has a personality function.
Definition: Function.h:688
void SetCurrentDebugLocation(DebugLoc L)
Set location information used by debugging information.
Definition: IRBuilder.h:151
LinkageTypes getLinkage() const
Definition: GlobalValue.h:450
static const char *const SanCovTracePCGuardName
Concrete subclass of DominatorTreeBase that is used to compute a normal dominator tree...
Definition: Dominators.h:142
amdgpu Simplify well known AMD library false Value * Callee
Function * getDeclaration(Module *M, ID id, ArrayRef< Type *> Tys=None)
Create or insert an LLVM Function declaration for an intrinsic, and return it.
Definition: Function.cpp:1007
INITIALIZE_PASS_BEGIN(SanitizerCoverageModule, "sancov", "SanitizerCoverage: TODO." "ModulePass", false, false) INITIALIZE_PASS_END(SanitizerCoverageModule
Interval::succ_iterator succ_end(Interval *I)
Definition: Interval.h:106
const BasicBlock & getEntryBlock() const
Definition: Function.h:626
an instruction for type-safe pointer arithmetic to access elements of arrays and structs ...
Definition: Instructions.h:841
LoadInst * CreateLoad(Value *Ptr, const char *Name)
Provided to resolve &#39;CreateLoad(Ptr, "...")&#39; correctly, instead of converting the string to &#39;bool&#39; fo...
Definition: IRBuilder.h:1305
static const char *const SanCovTracePCIndirName
static MDTuple * get(LLVMContext &Context, ArrayRef< Metadata *> MDs)
Definition: Metadata.h:1164
static bool runOnFunction(Function &F, bool PostInlining)
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:410
static GCRegistry::Add< OcamlGC > B("ocaml", "ocaml 3.10-compatible GC")
const_iterator getFirstInsertionPt() const
Returns an iterator to the first instruction in this block that is suitable for inserting a non-PHI i...
Definition: BasicBlock.cpp:218
static const char *const SanCovTraceCmp1
const BasicBlock * getSinglePredecessor() const
Return the predecessor of this block if it has a single predecessor block.
Definition: BasicBlock.cpp:235
LLVM Basic Block Representation.
Definition: BasicBlock.h:59
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
std::pair< Function *, Function * > createSanitizerCtorAndInitFunctions(Module &M, StringRef CtorName, StringRef InitName, ArrayRef< Type *> InitArgTypes, ArrayRef< Value *> InitArgs, StringRef VersionCheckName=StringRef())
Creates sanitizer constructor function, and calls sanitizer&#39;s init function from it.
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:69
DISubprogram * getSubprogram() const
Get the attached subprogram.
Definition: Metadata.cpp:1508
Constant * getOrInsertGlobal(StringRef Name, Type *Ty)
Look up the specified global in the module symbol table.
Definition: Module.cpp:202
static cl::opt< bool > ClCreatePCTable("sanitizer-coverage-pc-table", cl::desc("create a static PC table"), cl::Hidden, cl::init(false))
static const char *const SanCovTraceDiv4
static BlockAddress * get(Function *F, BasicBlock *BB)
Return a BlockAddress for the specified function and basic block.
Definition: Constants.cpp:1411
size_t size() const
size - Get the array size.
Definition: ArrayRef.h:149
This is an important base class in LLVM.
Definition: Constant.h:42
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator begin()
Definition: SmallVector.h:124
bool isPointerTy() const
True if this is an instance of PointerType.
Definition: Type.h:224
static const char *const SanCovTraceConstCmp8
Interval::pred_iterator pred_begin(Interval *I)
pred_begin/pred_end - define methods so that Intervals may be used just like BasicBlocks can with the...
Definition: Interval.h:113
EHPersonality classifyEHPersonality(const Value *Pers)
See if the given exception handling personality function is one that we understand.
Represent the analysis usage information of a pass.
static Type * getVoidTy(LLVMContext &C)
Definition: Type.cpp:161
This instruction compares its operands according to the predicate given to the constructor.
static FunctionType * get(Type *Result, ArrayRef< Type *> Params, bool isVarArg)
This static method is the primary way of constructing a FunctionType.
Definition: Type.cpp:297
Interval::pred_iterator pred_end(Interval *I)
Definition: Interval.h:116
static cl::opt< bool > ClPruneBlocks("sanitizer-coverage-prune-blocks", cl::desc("Reduce the number of instrumented blocks"), cl::Hidden, cl::init(true))
static cl::opt< bool > ClTracePCGuard("sanitizer-coverage-trace-pc-guard", cl::desc("pc tracing with a guard"), cl::Hidden, cl::init(false))
static const char *const SanCovTraceCmp4
static Constant * getAllOnesValue(Type *Ty)
Definition: Constants.cpp:322
LLVMContext & getContext() const
getContext - Return a reference to the LLVMContext associated with this function. ...
Definition: Function.cpp:194
Comdat * getOrInsertComdat(StringRef Name)
Return the Comdat in the module with the specified name.
Definition: Module.cpp:474
static const char *const SanCovTraceCmp8
size_t size() const
Definition: SmallVector.h:53
INITIALIZE_PASS_END(RegBankSelect, DEBUG_TYPE, "Assign register bank of generic virtual registers", false, false) RegBankSelect
void setMetadata(unsigned KindID, MDNode *Node)
Set the metadata of the specified kind to the specified node.
Definition: Metadata.cpp:1226
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
void sort(IteratorTy Start, IteratorTy End)
Definition: STLExtras.h:872
Value * CreateGEP(Value *Ptr, ArrayRef< Value *> IdxList, const Twine &Name="")
Definition: IRBuilder.h:1374
iterator_range< T > make_range(T x, T y)
Convenience function for iterating over sub-ranges.
Iterator for intrusive lists based on ilist_node.
static const char *const SanCovModuleCtorName
static PointerType * getUnqual(Type *ElementType)
This constructs a pointer to an object of the specified type in the generic address space (address sp...
Definition: DerivedTypes.h:482
iterator end()
Definition: BasicBlock.h:266
static bool isFullDominator(const BasicBlock *BB, const DominatorTree *DT)
unsigned getScalarSizeInBits() const LLVM_READONLY
If this is a vector type, return the getPrimitiveSizeInBits value for the element type...
Definition: Type.cpp:130
Value * CreateIntCast(Value *V, Type *DestTy, bool isSigned, const Twine &Name="")
Definition: IRBuilder.h:1698
static ValueAsMetadata * get(Value *V)
Definition: Metadata.cpp:349
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:841
bool dominates(const Instruction *Def, const Use &U) const
Return true if Def dominates a use in User.
Definition: Dominators.cpp:244
Module.h This file contains the declarations for the Module class.
static const char *const SanCovCountersSectionName
TerminatorInst * SplitBlockAndInsertIfThen(Value *Cond, Instruction *SplitBefore, bool Unreachable, MDNode *BranchWeights=nullptr, DominatorTree *DT=nullptr, LoopInfo *LI=nullptr)
Split the containing block at the specified instruction - everything before SplitBefore stays in the ...
static IntegerType * getIntNTy(LLVMContext &C, unsigned N)
Definition: Type.cpp:180
enum llvm::SanitizerCoverageOptions::Type CoverageType
static Constant * get(Type *Ty, uint64_t V, bool isSigned=false)
If Ty is a vector type, return a Constant with a splat of the given value.
Definition: Constants.cpp:621
void appendToGlobalCtors(Module &M, Function *F, int Priority, Constant *Data=nullptr)
Append F to the list of global ctors of module M with the given Priority.
Definition: ModuleUtils.cpp:84
static bool shouldInstrumentBlock(const Function &F, const BasicBlock *BB, const DominatorTree *DT, const PostDominatorTree *PDT, const SanitizerCoverageOptions &Options)
BasicBlock::iterator PrepareToSplitEntryBlock(BasicBlock &BB, BasicBlock::iterator IP)
Instrumentation passes often insert conditional checks into entry blocks.
void swap(llvm::BitVector &LHS, llvm::BitVector &RHS)
Implement std::swap in terms of BitVector swap.
Definition: BitVector.h:924
const Module * getModule() const
Return the module owning the function this instruction belongs to or nullptr it the function does not...
Definition: Instruction.cpp:56
static Constant * getCast(unsigned ops, Constant *C, Type *Ty, bool OnlyIfReduced=false)
Convenience function for getting a Cast operation.
Definition: Constants.cpp:1507
PostDominatorTree Class - Concrete subclass of DominatorTree that is used to compute the post-dominat...
static cl::opt< bool > ClTracePC("sanitizer-coverage-trace-pc", cl::desc("Experimental pc tracing"), cl::Hidden, cl::init(false))
Value * CreatePointerCast(Value *V, Type *DestTy, const Twine &Name="")
Definition: IRBuilder.h:1675
bool dominates(const DomTreeNodeBase< NodeT > *A, const DomTreeNodeBase< NodeT > *B) const
dominates - Returns true iff A dominates B.
const Comdat * getComdat() const
Definition: GlobalObject.h:101
LLVM_ATTRIBUTE_ALWAYS_INLINE iterator end()
Definition: SmallVector.h:128
static IntegerType * getInt32Ty(LLVMContext &C)
Definition: Type.cpp:176
static cl::opt< bool > ClGEPTracing("sanitizer-coverage-trace-geps", cl::desc("Tracing of GEP instructions"), cl::Hidden, cl::init(false))
static const char *const SanCovTraceDiv8
StringRef getName() const
Return a constant reference to the value&#39;s name.
Definition: Value.cpp:224
#define I(x, y, z)
Definition: MD5.cpp:58
#define N
ModulePass class - This class is used to implement unstructured interprocedural optimizations and ana...
Definition: Pass.h:225
static ArrayType * get(Type *ElementType, uint64_t NumElements)
This static method is the primary way to construct an ArrayType.
Definition: Type.cpp:568
ModulePass * createSanitizerCoverageModulePass(const SanitizerCoverageOptions &Options=SanitizerCoverageOptions())
Rename collisions when linking (static functions).
Definition: GlobalValue.h:56
static InlineAsm * get(FunctionType *Ty, StringRef AsmString, StringRef Constraints, bool hasSideEffects, bool isAlignStack=false, AsmDialect asmDialect=AD_ATT)
InlineAsm::get - Return the specified uniqued inline asm string.
Definition: InlineAsm.cpp:43
static cl::opt< bool > ClInline8bitCounters("sanitizer-coverage-inline-8bit-counters", cl::desc("increments 8-bit counter for every edge"), cl::Hidden, cl::init(false))
Value * CreatePtrToInt(Value *V, Type *DestTy, const Twine &Name="")
Definition: IRBuilder.h:1619
FunTy * getCalledFunction() const
Return the function being called if this is a direct call, otherwise return null (if it&#39;s an indirect...
Definition: CallSite.h:107
Multiway switch.
unsigned getMDKindID(StringRef Name) const
Return a unique non-zero ID for the specified metadata kind.
Definition: Module.cpp:118
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
bool isAsynchronousEHPersonality(EHPersonality Pers)
Returns true if this personality function catches asynchronous exceptions.
aarch64 promote const
unsigned getPrimitiveSizeInBits() const LLVM_READONLY
Return the basic size of this type if it is a primitive type.
Definition: Type.cpp:115
static const char *const SanCovTracePCGuardInitName
Module * getParent()
Get the module that this global value is contained inside of...
Definition: GlobalValue.h:565
LLVM Value Representation.
Definition: Value.h:73
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1288
void initializeSanitizerCoverageModulePass(PassRegistry &)
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
Legacy analysis pass which computes a DominatorTree.
Definition: Dominators.h:254
const TerminatorInst * getTerminator() const LLVM_READONLY
Returns the terminator instruction if the block is well formed or null if the block is not well forme...
Definition: BasicBlock.cpp:138
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t find(char C, size_t From=0) const
Search for the first character C in the string.
Definition: StringRef.h:298
static const char *const SanCovTraceConstCmp4
static IntegerType * getInt8Ty(LLVMContext &C)
Definition: Type.cpp:174
bool empty() const
empty - Check if the array is empty.
Definition: ArrayRef.h:144
IntegerType * Int32Ty
CallInst * CreateCall(Value *Callee, ArrayRef< Value *> Args=None, const Twine &Name="", MDNode *FPMathTag=nullptr)
Definition: IRBuilder.h:1871