LLVM  6.0.0svn
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"
38 #include "llvm/Transforms/Scalar.h"
41 
42 using namespace llvm;
43 
44 #define DEBUG_TYPE "sancov"
45 
46 static const char *const SanCovTracePCIndirName =
47  "__sanitizer_cov_trace_pc_indir";
48 static const char *const SanCovTracePCName = "__sanitizer_cov_trace_pc";
49 static const char *const SanCovTraceCmp1 = "__sanitizer_cov_trace_cmp1";
50 static const char *const SanCovTraceCmp2 = "__sanitizer_cov_trace_cmp2";
51 static const char *const SanCovTraceCmp4 = "__sanitizer_cov_trace_cmp4";
52 static const char *const SanCovTraceCmp8 = "__sanitizer_cov_trace_cmp8";
53 static const char *const SanCovTraceConstCmp1 =
54  "__sanitizer_cov_trace_const_cmp1";
55 static const char *const SanCovTraceConstCmp2 =
56  "__sanitizer_cov_trace_const_cmp2";
57 static const char *const SanCovTraceConstCmp4 =
58  "__sanitizer_cov_trace_const_cmp4";
59 static const char *const SanCovTraceConstCmp8 =
60  "__sanitizer_cov_trace_const_cmp8";
61 static const char *const SanCovTraceDiv4 = "__sanitizer_cov_trace_div4";
62 static const char *const SanCovTraceDiv8 = "__sanitizer_cov_trace_div8";
63 static const char *const SanCovTraceGep = "__sanitizer_cov_trace_gep";
64 static const char *const SanCovTraceSwitchName = "__sanitizer_cov_trace_switch";
65 static const char *const SanCovModuleCtorName = "sancov.module_ctor";
66 static const uint64_t SanCtorAndDtorPriority = 2;
67 
68 static const char *const SanCovTracePCGuardName =
69  "__sanitizer_cov_trace_pc_guard";
70 static const char *const SanCovTracePCGuardInitName =
71  "__sanitizer_cov_trace_pc_guard_init";
72 static const char *const SanCov8bitCountersInitName =
73  "__sanitizer_cov_8bit_counters_init";
74 static const char *const SanCovPCsInitName = "__sanitizer_cov_pcs_init";
75 
76 static const char *const SanCovGuardsSectionName = "sancov_guards";
77 static const char *const SanCovCountersSectionName = "sancov_cntrs";
78 static const char *const SanCovPCsSectionName = "sancov_pcs";
79 
80 static const char *const SanCovLowestStackName = "__sancov_lowest_stack";
81 
83  "sanitizer-coverage-level",
84  cl::desc("Sanitizer Coverage. 0: none, 1: entry block, 2: all blocks, "
85  "3: all blocks and critical edges"),
86  cl::Hidden, cl::init(0));
87 
88 static cl::opt<bool> ClTracePC("sanitizer-coverage-trace-pc",
89  cl::desc("Experimental pc tracing"), cl::Hidden,
90  cl::init(false));
91 
92 static cl::opt<bool> ClTracePCGuard("sanitizer-coverage-trace-pc-guard",
93  cl::desc("pc tracing with a guard"),
94  cl::Hidden, cl::init(false));
95 
96 // If true, we create a global variable that contains PCs of all instrumented
97 // BBs, put this global into a named section, and pass this section's bounds
98 // to __sanitizer_cov_pcs_init.
99 // This way the coverage instrumentation does not need to acquire the PCs
100 // at run-time. Works with trace-pc-guard and inline-8bit-counters.
101 static cl::opt<bool> ClCreatePCTable("sanitizer-coverage-pc-table",
102  cl::desc("create a static PC table"),
103  cl::Hidden, cl::init(false));
104 
105 static cl::opt<bool>
106  ClInline8bitCounters("sanitizer-coverage-inline-8bit-counters",
107  cl::desc("increments 8-bit counter for every edge"),
108  cl::Hidden, cl::init(false));
109 
110 static cl::opt<bool>
111  ClCMPTracing("sanitizer-coverage-trace-compares",
112  cl::desc("Tracing of CMP and similar instructions"),
113  cl::Hidden, cl::init(false));
114 
115 static cl::opt<bool> ClDIVTracing("sanitizer-coverage-trace-divs",
116  cl::desc("Tracing of DIV instructions"),
117  cl::Hidden, cl::init(false));
118 
119 static cl::opt<bool> ClGEPTracing("sanitizer-coverage-trace-geps",
120  cl::desc("Tracing of GEP instructions"),
121  cl::Hidden, cl::init(false));
122 
123 static cl::opt<bool>
124  ClPruneBlocks("sanitizer-coverage-prune-blocks",
125  cl::desc("Reduce the number of instrumented blocks"),
126  cl::Hidden, cl::init(true));
127 
128 static cl::opt<bool> ClStackDepth("sanitizer-coverage-stack-depth",
129  cl::desc("max stack depth tracing"),
130  cl::Hidden, cl::init(false));
131 
132 namespace {
133 
134 SanitizerCoverageOptions getOptions(int LegacyCoverageLevel) {
136  switch (LegacyCoverageLevel) {
137  case 0:
139  break;
140  case 1:
142  break;
143  case 2:
145  break;
146  case 3:
148  break;
149  case 4:
151  Res.IndirectCalls = true;
152  break;
153  }
154  return Res;
155 }
156 
157 SanitizerCoverageOptions OverrideFromCL(SanitizerCoverageOptions Options) {
158  // Sets CoverageType and IndirectCalls.
159  SanitizerCoverageOptions CLOpts = getOptions(ClCoverageLevel);
160  Options.CoverageType = std::max(Options.CoverageType, CLOpts.CoverageType);
161  Options.IndirectCalls |= CLOpts.IndirectCalls;
162  Options.TraceCmp |= ClCMPTracing;
163  Options.TraceDiv |= ClDIVTracing;
164  Options.TraceGep |= ClGEPTracing;
165  Options.TracePC |= ClTracePC;
166  Options.TracePCGuard |= ClTracePCGuard;
168  Options.PCTable |= ClCreatePCTable;
169  Options.NoPrune |= !ClPruneBlocks;
170  Options.StackDepth |= ClStackDepth;
171  if (!Options.TracePCGuard && !Options.TracePC &&
172  !Options.Inline8bitCounters && !Options.StackDepth)
173  Options.TracePCGuard = true; // TracePCGuard is default.
174  return Options;
175 }
176 
177 class SanitizerCoverageModule : public ModulePass {
178 public:
179  SanitizerCoverageModule(
181  : ModulePass(ID), Options(OverrideFromCL(Options)) {
183  }
184  bool runOnModule(Module &M) override;
185  bool runOnFunction(Function &F);
186  static char ID; // Pass identification, replacement for typeid
187  StringRef getPassName() const override { return "SanitizerCoverageModule"; }
188 
189  void getAnalysisUsage(AnalysisUsage &AU) const override {
192  }
193 
194 private:
195  void InjectCoverageForIndirectCalls(Function &F,
196  ArrayRef<Instruction *> IndirCalls);
197  void InjectTraceForCmp(Function &F, ArrayRef<Instruction *> CmpTraceTargets);
198  void InjectTraceForDiv(Function &F,
199  ArrayRef<BinaryOperator *> DivTraceTargets);
200  void InjectTraceForGep(Function &F,
201  ArrayRef<GetElementPtrInst *> GepTraceTargets);
202  void InjectTraceForSwitch(Function &F,
203  ArrayRef<Instruction *> SwitchTraceTargets);
204  bool InjectCoverage(Function &F, ArrayRef<BasicBlock *> AllBlocks,
205  bool IsLeafFunc = true);
206  GlobalVariable *CreateFunctionLocalArrayInSection(size_t NumElements,
207  Function &F, Type *Ty,
208  const char *Section);
209  GlobalVariable *CreatePCArray(Function &F, ArrayRef<BasicBlock *> AllBlocks);
210  void CreateFunctionLocalArrays(Function &F, ArrayRef<BasicBlock *> AllBlocks);
211  void InjectCoverageAtBlock(Function &F, BasicBlock &BB, size_t Idx,
212  bool IsLeafFunc = true);
213  Function *CreateInitCallsForSections(Module &M, const char *InitFunctionName,
214  Type *Ty, const char *Section);
215  std::pair<GlobalVariable *, GlobalVariable *>
216  CreateSecStartEnd(Module &M, const char *Section, Type *Ty);
217 
218  void SetNoSanitizeMetadata(Instruction *I) {
219  I->setMetadata(I->getModule()->getMDKindID("nosanitize"),
220  MDNode::get(*C, None));
221  }
222 
223  std::string getSectionName(const std::string &Section) const;
224  std::string getSectionStart(const std::string &Section) const;
225  std::string getSectionEnd(const std::string &Section) const;
226  Function *SanCovTracePCIndir;
227  Function *SanCovTracePC, *SanCovTracePCGuard;
228  Function *SanCovTraceCmpFunction[4];
229  Function *SanCovTraceConstCmpFunction[4];
230  Function *SanCovTraceDivFunction[2];
231  Function *SanCovTraceGepFunction;
232  Function *SanCovTraceSwitchFunction;
233  GlobalVariable *SanCovLowestStack;
234  InlineAsm *EmptyAsm;
235  Type *IntptrTy, *IntptrPtrTy, *Int64Ty, *Int64PtrTy, *Int32Ty, *Int32PtrTy,
236  *Int16Ty, *Int8Ty, *Int8PtrTy;
237  Module *CurModule;
238  Triple TargetTriple;
239  LLVMContext *C;
240  const DataLayout *DL;
241 
242  GlobalVariable *FunctionGuardArray; // for trace-pc-guard.
243  GlobalVariable *Function8bitCounterArray; // for inline-8bit-counters.
244  GlobalVariable *FunctionPCsArray; // for pc-table.
245  SmallVector<GlobalValue *, 20> GlobalsToAppendToUsed;
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  return true;
409 }
410 
411 // True if block has successors and it dominates all of them.
412 static bool isFullDominator(const BasicBlock *BB, const DominatorTree *DT) {
413  if (succ_begin(BB) == succ_end(BB))
414  return false;
415 
416  for (const BasicBlock *SUCC : make_range(succ_begin(BB), succ_end(BB))) {
417  if (!DT->dominates(BB, SUCC))
418  return false;
419  }
420 
421  return true;
422 }
423 
424 // True if block has predecessors and it postdominates all of them.
425 static bool isFullPostDominator(const BasicBlock *BB,
426  const PostDominatorTree *PDT) {
427  if (pred_begin(BB) == pred_end(BB))
428  return false;
429 
430  for (const BasicBlock *PRED : make_range(pred_begin(BB), pred_end(BB))) {
431  if (!PDT->dominates(BB, PRED))
432  return false;
433  }
434 
435  return true;
436 }
437 
438 static bool shouldInstrumentBlock(const Function &F, const BasicBlock *BB,
439  const DominatorTree *DT,
440  const PostDominatorTree *PDT,
441  const SanitizerCoverageOptions &Options) {
442  // Don't insert coverage for unreachable blocks: we will never call
443  // __sanitizer_cov() for them, so counting them in
444  // NumberOfInstrumentedBlocks() might complicate calculation of code coverage
445  // percentage. Also, unreachable instructions frequently have no debug
446  // locations.
447  if (isa<UnreachableInst>(BB->getTerminator()))
448  return false;
449 
450  // Don't insert coverage into blocks without a valid insertion point
451  // (catchswitch blocks).
452  if (BB->getFirstInsertionPt() == BB->end())
453  return false;
454 
455  if (Options.NoPrune || &F.getEntryBlock() == BB)
456  return true;
457 
459  &F.getEntryBlock() != BB)
460  return false;
461 
462  // Do not instrument full dominators, or full post-dominators with multiple
463  // predecessors.
464  return !isFullDominator(BB, DT)
465  && !(isFullPostDominator(BB, PDT) && !BB->getSinglePredecessor());
466 }
467 
469  if (F.empty())
470  return false;
471  if (F.getName().find(".module_ctor") != std::string::npos)
472  return false; // Should not instrument sanitizer init functions.
473  if (F.getName().startswith("__sanitizer_"))
474  return false; // Don't instrument __sanitizer_* callbacks.
475  // Don't touch available_externally functions, their actual body is elewhere.
477  return false;
478  // Don't instrument MSVC CRT configuration helpers. They may run before normal
479  // initialization.
480  if (F.getName() == "__local_stdio_printf_options" ||
481  F.getName() == "__local_stdio_scanf_options")
482  return false;
483  // Don't instrument functions using SEH for now. Splitting basic blocks like
484  // we do for coverage breaks WinEHPrepare.
485  // FIXME: Remove this when SEH no longer uses landingpad pattern matching.
486  if (F.hasPersonalityFn() &&
488  return false;
492  SmallVector<BasicBlock *, 16> BlocksToInstrument;
493  SmallVector<Instruction *, 8> CmpTraceTargets;
494  SmallVector<Instruction *, 8> SwitchTraceTargets;
495  SmallVector<BinaryOperator *, 8> DivTraceTargets;
496  SmallVector<GetElementPtrInst *, 8> GepTraceTargets;
497 
498  const DominatorTree *DT =
499  &getAnalysis<DominatorTreeWrapperPass>(F).getDomTree();
500  const PostDominatorTree *PDT =
501  &getAnalysis<PostDominatorTreeWrapperPass>(F).getPostDomTree();
502  bool IsLeafFunc = true;
503 
504  for (auto &BB : F) {
505  if (shouldInstrumentBlock(F, &BB, DT, PDT, Options))
506  BlocksToInstrument.push_back(&BB);
507  for (auto &Inst : BB) {
508  if (Options.IndirectCalls) {
509  CallSite CS(&Inst);
510  if (CS && !CS.getCalledFunction())
511  IndirCalls.push_back(&Inst);
512  }
513  if (Options.TraceCmp) {
514  if (isa<ICmpInst>(&Inst))
515  CmpTraceTargets.push_back(&Inst);
516  if (isa<SwitchInst>(&Inst))
517  SwitchTraceTargets.push_back(&Inst);
518  }
519  if (Options.TraceDiv)
520  if (BinaryOperator *BO = dyn_cast<BinaryOperator>(&Inst))
521  if (BO->getOpcode() == Instruction::SDiv ||
522  BO->getOpcode() == Instruction::UDiv)
523  DivTraceTargets.push_back(BO);
524  if (Options.TraceGep)
525  if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(&Inst))
526  GepTraceTargets.push_back(GEP);
527  if (Options.StackDepth)
528  if (isa<InvokeInst>(Inst) ||
529  (isa<CallInst>(Inst) && !isa<IntrinsicInst>(Inst)))
530  IsLeafFunc = false;
531  }
532  }
533 
534  InjectCoverage(F, BlocksToInstrument, IsLeafFunc);
535  InjectCoverageForIndirectCalls(F, IndirCalls);
536  InjectTraceForCmp(F, CmpTraceTargets);
537  InjectTraceForSwitch(F, SwitchTraceTargets);
538  InjectTraceForDiv(F, DivTraceTargets);
539  InjectTraceForGep(F, GepTraceTargets);
540  return true;
541 }
542 
543 GlobalVariable *SanitizerCoverageModule::CreateFunctionLocalArrayInSection(
544  size_t NumElements, Function &F, Type *Ty, const char *Section) {
545  ArrayType *ArrayTy = ArrayType::get(Ty, NumElements);
546  auto Array = new GlobalVariable(
547  *CurModule, ArrayTy, false, GlobalVariable::PrivateLinkage,
548  Constant::getNullValue(ArrayTy), "__sancov_gen_");
549  if (auto Comdat = F.getComdat())
550  Array->setComdat(Comdat);
551  Array->setSection(getSectionName(Section));
552  Array->setAlignment(Ty->isPointerTy() ? DL->getPointerSize()
553  : Ty->getPrimitiveSizeInBits() / 8);
554  return Array;
555 }
556 
558 SanitizerCoverageModule::CreatePCArray(Function &F,
559  ArrayRef<BasicBlock *> AllBlocks) {
560  size_t N = AllBlocks.size();
561  assert(N);
564  for (size_t i = 0; i < N; i++) {
565  if (&F.getEntryBlock() == AllBlocks[i]) {
566  PCs.push_back((Constant *)IRB.CreatePointerCast(&F, IntptrPtrTy));
567  PCs.push_back((Constant *)IRB.CreateIntToPtr(
568  ConstantInt::get(IntptrTy, 1), IntptrPtrTy));
569  } else {
570  PCs.push_back((Constant *)IRB.CreatePointerCast(
571  BlockAddress::get(AllBlocks[i]), IntptrPtrTy));
572  PCs.push_back((Constant *)IRB.CreateIntToPtr(
573  ConstantInt::get(IntptrTy, 0), IntptrPtrTy));
574  }
575  }
576  auto *PCArray = CreateFunctionLocalArrayInSection(N * 2, F, IntptrPtrTy,
577  SanCovPCsSectionName);
578  PCArray->setInitializer(
579  ConstantArray::get(ArrayType::get(IntptrPtrTy, N * 2), PCs));
580  PCArray->setConstant(true);
581 
582  return PCArray;
583 }
584 
585 void SanitizerCoverageModule::CreateFunctionLocalArrays(
586  Function &F, ArrayRef<BasicBlock *> AllBlocks) {
587  if (Options.TracePCGuard) {
588  FunctionGuardArray = CreateFunctionLocalArrayInSection(
589  AllBlocks.size(), F, Int32Ty, SanCovGuardsSectionName);
590  GlobalsToAppendToUsed.push_back(FunctionGuardArray);
591  }
592  if (Options.Inline8bitCounters) {
593  Function8bitCounterArray = CreateFunctionLocalArrayInSection(
594  AllBlocks.size(), F, Int8Ty, SanCovCountersSectionName);
595  GlobalsToAppendToUsed.push_back(Function8bitCounterArray);
596  }
597  if (Options.PCTable) {
598  FunctionPCsArray = CreatePCArray(F, AllBlocks);
599  GlobalsToAppendToUsed.push_back(FunctionPCsArray);
600  }
601 }
602 
603 bool SanitizerCoverageModule::InjectCoverage(Function &F,
604  ArrayRef<BasicBlock *> AllBlocks,
605  bool IsLeafFunc) {
606  if (AllBlocks.empty()) return false;
607  CreateFunctionLocalArrays(F, AllBlocks);
608  for (size_t i = 0, N = AllBlocks.size(); i < N; i++)
609  InjectCoverageAtBlock(F, *AllBlocks[i], i, IsLeafFunc);
610  return true;
611 }
612 
613 // On every indirect call we call a run-time function
614 // __sanitizer_cov_indir_call* with two parameters:
615 // - callee address,
616 // - global cache array that contains CacheSize pointers (zero-initialized).
617 // The cache is used to speed up recording the caller-callee pairs.
618 // The address of the caller is passed implicitly via caller PC.
619 // CacheSize is encoded in the name of the run-time function.
620 void SanitizerCoverageModule::InjectCoverageForIndirectCalls(
621  Function &F, ArrayRef<Instruction *> IndirCalls) {
622  if (IndirCalls.empty())
623  return;
624  assert(Options.TracePC || Options.TracePCGuard || Options.Inline8bitCounters);
625  for (auto I : IndirCalls) {
626  IRBuilder<> IRB(I);
627  CallSite CS(I);
628  Value *Callee = CS.getCalledValue();
629  if (isa<InlineAsm>(Callee))
630  continue;
631  IRB.CreateCall(SanCovTracePCIndir, IRB.CreatePointerCast(Callee, IntptrTy));
632  }
633 }
634 
635 // For every switch statement we insert a call:
636 // __sanitizer_cov_trace_switch(CondValue,
637 // {NumCases, ValueSizeInBits, Case0Value, Case1Value, Case2Value, ... })
638 
639 void SanitizerCoverageModule::InjectTraceForSwitch(
640  Function &, ArrayRef<Instruction *> SwitchTraceTargets) {
641  for (auto I : SwitchTraceTargets) {
642  if (SwitchInst *SI = dyn_cast<SwitchInst>(I)) {
643  IRBuilder<> IRB(I);
644  SmallVector<Constant *, 16> Initializers;
645  Value *Cond = SI->getCondition();
646  if (Cond->getType()->getScalarSizeInBits() >
647  Int64Ty->getScalarSizeInBits())
648  continue;
649  Initializers.push_back(ConstantInt::get(Int64Ty, SI->getNumCases()));
650  Initializers.push_back(
651  ConstantInt::get(Int64Ty, Cond->getType()->getScalarSizeInBits()));
652  if (Cond->getType()->getScalarSizeInBits() <
653  Int64Ty->getScalarSizeInBits())
654  Cond = IRB.CreateIntCast(Cond, Int64Ty, false);
655  for (auto It : SI->cases()) {
656  Constant *C = It.getCaseValue();
657  if (C->getType()->getScalarSizeInBits() <
658  Int64Ty->getScalarSizeInBits())
659  C = ConstantExpr::getCast(CastInst::ZExt, It.getCaseValue(), Int64Ty);
660  Initializers.push_back(C);
661  }
662  std::sort(Initializers.begin() + 2, Initializers.end(),
663  [](const Constant *A, const Constant *B) {
664  return cast<ConstantInt>(A)->getLimitedValue() <
665  cast<ConstantInt>(B)->getLimitedValue();
666  });
667  ArrayType *ArrayOfInt64Ty = ArrayType::get(Int64Ty, Initializers.size());
668  GlobalVariable *GV = new GlobalVariable(
669  *CurModule, ArrayOfInt64Ty, false, GlobalVariable::InternalLinkage,
670  ConstantArray::get(ArrayOfInt64Ty, Initializers),
671  "__sancov_gen_cov_switch_values");
672  IRB.CreateCall(SanCovTraceSwitchFunction,
673  {Cond, IRB.CreatePointerCast(GV, Int64PtrTy)});
674  }
675  }
676 }
677 
678 void SanitizerCoverageModule::InjectTraceForDiv(
679  Function &, ArrayRef<BinaryOperator *> DivTraceTargets) {
680  for (auto BO : DivTraceTargets) {
681  IRBuilder<> IRB(BO);
682  Value *A1 = BO->getOperand(1);
683  if (isa<ConstantInt>(A1)) continue;
684  if (!A1->getType()->isIntegerTy())
685  continue;
686  uint64_t TypeSize = DL->getTypeStoreSizeInBits(A1->getType());
687  int CallbackIdx = TypeSize == 32 ? 0 :
688  TypeSize == 64 ? 1 : -1;
689  if (CallbackIdx < 0) continue;
690  auto Ty = Type::getIntNTy(*C, TypeSize);
691  IRB.CreateCall(SanCovTraceDivFunction[CallbackIdx],
692  {IRB.CreateIntCast(A1, Ty, true)});
693  }
694 }
695 
696 void SanitizerCoverageModule::InjectTraceForGep(
697  Function &, ArrayRef<GetElementPtrInst *> GepTraceTargets) {
698  for (auto GEP : GepTraceTargets) {
699  IRBuilder<> IRB(GEP);
700  for (auto I = GEP->idx_begin(); I != GEP->idx_end(); ++I)
701  if (!isa<ConstantInt>(*I) && (*I)->getType()->isIntegerTy())
702  IRB.CreateCall(SanCovTraceGepFunction,
703  {IRB.CreateIntCast(*I, IntptrTy, true)});
704  }
705 }
706 
707 void SanitizerCoverageModule::InjectTraceForCmp(
708  Function &, ArrayRef<Instruction *> CmpTraceTargets) {
709  for (auto I : CmpTraceTargets) {
710  if (ICmpInst *ICMP = dyn_cast<ICmpInst>(I)) {
711  IRBuilder<> IRB(ICMP);
712  Value *A0 = ICMP->getOperand(0);
713  Value *A1 = ICMP->getOperand(1);
714  if (!A0->getType()->isIntegerTy())
715  continue;
716  uint64_t TypeSize = DL->getTypeStoreSizeInBits(A0->getType());
717  int CallbackIdx = TypeSize == 8 ? 0 :
718  TypeSize == 16 ? 1 :
719  TypeSize == 32 ? 2 :
720  TypeSize == 64 ? 3 : -1;
721  if (CallbackIdx < 0) continue;
722  // __sanitizer_cov_trace_cmp((type_size << 32) | predicate, A0, A1);
723  auto CallbackFunc = SanCovTraceCmpFunction[CallbackIdx];
724  bool FirstIsConst = isa<ConstantInt>(A0);
725  bool SecondIsConst = isa<ConstantInt>(A1);
726  // If both are const, then we don't need such a comparison.
727  if (FirstIsConst && SecondIsConst) continue;
728  // If only one is const, then make it the first callback argument.
729  if (FirstIsConst || SecondIsConst) {
730  CallbackFunc = SanCovTraceConstCmpFunction[CallbackIdx];
731  if (SecondIsConst)
732  std::swap(A0, A1);
733  }
734 
735  auto Ty = Type::getIntNTy(*C, TypeSize);
736  IRB.CreateCall(CallbackFunc, {IRB.CreateIntCast(A0, Ty, true),
737  IRB.CreateIntCast(A1, Ty, true)});
738  }
739  }
740 }
741 
742 void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
743  size_t Idx,
744  bool IsLeafFunc) {
746  bool IsEntryBB = &BB == &F.getEntryBlock();
747  DebugLoc EntryLoc;
748  if (IsEntryBB) {
749  if (auto SP = F.getSubprogram())
750  EntryLoc = DebugLoc::get(SP->getScopeLine(), 0, SP);
751  // Keep static allocas and llvm.localescape calls in the entry block. Even
752  // if we aren't splitting the block, it's nice for allocas to be before
753  // calls.
754  IP = PrepareToSplitEntryBlock(BB, IP);
755  } else {
756  EntryLoc = IP->getDebugLoc();
757  }
758 
759  IRBuilder<> IRB(&*IP);
760  IRB.SetCurrentDebugLocation(EntryLoc);
761  if (Options.TracePC) {
762  IRB.CreateCall(SanCovTracePC); // gets the PC using GET_CALLER_PC.
763  IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
764  }
765  if (Options.TracePCGuard) {
766  auto GuardPtr = IRB.CreateIntToPtr(
767  IRB.CreateAdd(IRB.CreatePointerCast(FunctionGuardArray, IntptrTy),
768  ConstantInt::get(IntptrTy, Idx * 4)),
769  Int32PtrTy);
770  IRB.CreateCall(SanCovTracePCGuard, GuardPtr);
771  IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
772  }
773  if (Options.Inline8bitCounters) {
774  auto CounterPtr = IRB.CreateGEP(
775  Function8bitCounterArray,
776  {ConstantInt::get(IntptrTy, 0), ConstantInt::get(IntptrTy, Idx)});
777  auto Load = IRB.CreateLoad(CounterPtr);
778  auto Inc = IRB.CreateAdd(Load, ConstantInt::get(Int8Ty, 1));
779  auto Store = IRB.CreateStore(Inc, CounterPtr);
780  SetNoSanitizeMetadata(Load);
781  SetNoSanitizeMetadata(Store);
782  }
783  if (Options.StackDepth && IsEntryBB && !IsLeafFunc) {
784  // Check stack depth. If it's the deepest so far, record it.
785  Function *GetFrameAddr =
786  Intrinsic::getDeclaration(F.getParent(), Intrinsic::frameaddress);
787  auto FrameAddrPtr =
788  IRB.CreateCall(GetFrameAddr, {Constant::getNullValue(Int32Ty)});
789  auto FrameAddrInt = IRB.CreatePtrToInt(FrameAddrPtr, IntptrTy);
790  auto LowestStack = IRB.CreateLoad(SanCovLowestStack);
791  auto IsStackLower = IRB.CreateICmpULT(FrameAddrInt, LowestStack);
792  auto ThenTerm = SplitBlockAndInsertIfThen(IsStackLower, &*IP, false);
793  IRBuilder<> ThenIRB(ThenTerm);
794  auto Store = ThenIRB.CreateStore(FrameAddrInt, SanCovLowestStack);
795  SetNoSanitizeMetadata(LowestStack);
796  SetNoSanitizeMetadata(Store);
797  }
798 }
799 
800 std::string
801 SanitizerCoverageModule::getSectionName(const std::string &Section) const {
802  if (TargetTriple.getObjectFormat() == Triple::COFF)
803  return ".SCOV$M";
804  if (TargetTriple.isOSBinFormatMachO())
805  return "__DATA,__" + Section;
806  return "__" + Section;
807 }
808 
809 std::string
810 SanitizerCoverageModule::getSectionStart(const std::string &Section) const {
811  if (TargetTriple.isOSBinFormatMachO())
812  return "\1section$start$__DATA$__" + Section;
813  return "__start___" + Section;
814 }
815 
816 std::string
817 SanitizerCoverageModule::getSectionEnd(const std::string &Section) const {
818  if (TargetTriple.isOSBinFormatMachO())
819  return "\1section$end$__DATA$__" + Section;
820  return "__stop___" + Section;
821 }
822 
823 
825 INITIALIZE_PASS_BEGIN(SanitizerCoverageModule, "sancov",
826  "SanitizerCoverage: TODO."
827  "ModulePass",
828  false, false)
831 INITIALIZE_PASS_END(SanitizerCoverageModule, "sancov",
832  "SanitizerCoverage: TODO."
833  "ModulePass",
834  false, false)
836  const SanitizerCoverageOptions &Options) {
837  return new SanitizerCoverageModule(Options);
838 }
void setVisibility(VisibilityTypes V)
Definition: GlobalValue.h:231
static const char *const SanCovPCsSectionName
uint64_t CallInst * C
A parsed version of the target data layout string in and methods for querying it. ...
Definition: DataLayout.h:109
const std::string & getTargetTriple() const
Get the target triple which is a string describing the target host.
Definition: Module.h:233
Function * declareSanitizerInitFunction(Module &M, StringRef InitName, ArrayRef< Type *> InitArgTypes)
bool empty() const
Definition: Function.h:594
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:1562
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
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
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
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:888
static Constant * getNullValue(Type *Ty)
Constructor to create a &#39;0&#39; constant of arbitrary type.
Definition: Constants.cpp:207
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:237
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:668
static const char *const SanCovLowestStackName
Value * CreateAdd(Value *LHS, Value *RHS, const Twine &Name="", bool HasNUW=false, bool HasNSW=false)
Definition: IRBuilder.h:893
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:1180
Value * CreateIntToPtr(Value *V, Type *DestTy, const Twine &Name="")
Definition: IRBuilder.h:1444
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:634
void SetCurrentDebugLocation(DebugLoc L)
Set location information used by debugging information.
Definition: IRBuilder.h:152
LinkageTypes getLinkage() const
Definition: GlobalValue.h:441
static const char *const SanCovTracePCGuardName
Concrete subclass of DominatorTreeBase that is used to compute a normal dominator tree...
Definition: Dominators.h:140
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:980
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:572
an instruction for type-safe pointer arithmetic to access elements of arrays and structs ...
Definition: Instructions.h:837
LoadInst * CreateLoad(Value *Ptr, const char *Name)
Definition: IRBuilder.h:1168
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:406
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:200
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:217
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:1497
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:1339
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:116
bool isPointerTy() const
True if this is an instance of PointerType.
Definition: Type.h:221
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)
Get the all ones value.
Definition: Constants.cpp:261
Comdat * getOrInsertComdat(StringRef Name)
Return the Comdat in the module with the specified name.
Definition: Module.cpp:467
static const char *const SanCovTraceCmp8
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:1214
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
Value * CreateGEP(Value *Ptr, ArrayRef< Value *> IdxList, const Twine &Name="")
Definition: IRBuilder.h:1227
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:254
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:1511
This is a &#39;vector&#39; (really, a variable-sized array), optimized for the case when the array is small...
Definition: SmallVector.h:864
bool dominates(const Instruction *Def, const Use &U) const
Return true if Def dominates a use in User.
Definition: Dominators.cpp:239
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:560
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:923
const Module * getModule() const
Return the module owning the function this instruction belongs to or nullptr it the function does not...
Definition: Instruction.cpp:57
static Constant * getCast(unsigned ops, Constant *C, Type *Ty, bool OnlyIfReduced=false)
Convenience function for getting a Cast operation.
Definition: Constants.cpp:1435
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:1488
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:120
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:220
#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:1440
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:556
LLVM Value Representation.
Definition: Value.h:73
Constant * getPersonalityFn() const
Get the personality function associated with this function.
Definition: Function.cpp:1260
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:267
void sort(Policy policy, RandomAccessIterator Start, RandomAccessIterator End, const Comparator &Comp=Comparator())
Definition: Parallel.h:199
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:120
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:1663