clang  13.0.0git
AnalysisBasedWarnings.cpp
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1 //=- AnalysisBasedWarnings.cpp - Sema warnings based on libAnalysis -*- C++ -*-=//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file defines analysis_warnings::[Policy,Executor].
10 // Together they are used by Sema to issue warnings based on inexpensive
11 // static analysis algorithms in libAnalysis.
12 //
13 //===----------------------------------------------------------------------===//
14 
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclObjC.h"
19 #include "clang/AST/ExprCXX.h"
20 #include "clang/AST/ExprObjC.h"
21 #include "clang/AST/ParentMap.h"
23 #include "clang/AST/StmtCXX.h"
24 #include "clang/AST/StmtObjC.h"
25 #include "clang/AST/StmtVisitor.h"
33 #include "clang/Analysis/CFG.h"
37 #include "clang/Lex/Preprocessor.h"
38 #include "clang/Sema/ScopeInfo.h"
40 #include "llvm/ADT/ArrayRef.h"
41 #include "llvm/ADT/BitVector.h"
42 #include "llvm/ADT/MapVector.h"
43 #include "llvm/ADT/SmallString.h"
44 #include "llvm/ADT/SmallVector.h"
45 #include "llvm/ADT/StringRef.h"
46 #include "llvm/Support/Casting.h"
47 #include <algorithm>
48 #include <deque>
49 #include <iterator>
50 
51 using namespace clang;
52 
53 //===----------------------------------------------------------------------===//
54 // Unreachable code analysis.
55 //===----------------------------------------------------------------------===//
56 
57 namespace {
58  class UnreachableCodeHandler : public reachable_code::Callback {
59  Sema &S;
60  SourceRange PreviousSilenceableCondVal;
61 
62  public:
63  UnreachableCodeHandler(Sema &s) : S(s) {}
64 
65  void HandleUnreachable(reachable_code::UnreachableKind UK,
67  SourceRange SilenceableCondVal,
68  SourceRange R1,
69  SourceRange R2) override {
70  // Avoid reporting multiple unreachable code diagnostics that are
71  // triggered by the same conditional value.
72  if (PreviousSilenceableCondVal.isValid() &&
73  SilenceableCondVal.isValid() &&
74  PreviousSilenceableCondVal == SilenceableCondVal)
75  return;
76  PreviousSilenceableCondVal = SilenceableCondVal;
77 
78  unsigned diag = diag::warn_unreachable;
79  switch (UK) {
81  diag = diag::warn_unreachable_break;
82  break;
84  diag = diag::warn_unreachable_return;
85  break;
87  diag = diag::warn_unreachable_loop_increment;
88  break;
90  break;
91  }
92 
93  S.Diag(L, diag) << R1 << R2;
94 
95  SourceLocation Open = SilenceableCondVal.getBegin();
96  if (Open.isValid()) {
97  SourceLocation Close = SilenceableCondVal.getEnd();
98  Close = S.getLocForEndOfToken(Close);
99  if (Close.isValid()) {
100  S.Diag(Open, diag::note_unreachable_silence)
101  << FixItHint::CreateInsertion(Open, "/* DISABLES CODE */ (")
102  << FixItHint::CreateInsertion(Close, ")");
103  }
104  }
105  }
106  };
107 } // anonymous namespace
108 
109 /// CheckUnreachable - Check for unreachable code.
111  // As a heuristic prune all diagnostics not in the main file. Currently
112  // the majority of warnings in headers are false positives. These
113  // are largely caused by configuration state, e.g. preprocessor
114  // defined code, etc.
115  //
116  // Note that this is also a performance optimization. Analyzing
117  // headers many times can be expensive.
119  return;
120 
121  UnreachableCodeHandler UC(S);
123 }
124 
125 namespace {
126 /// Warn on logical operator errors in CFGBuilder
127 class LogicalErrorHandler : public CFGCallback {
128  Sema &S;
129 
130 public:
131  LogicalErrorHandler(Sema &S) : CFGCallback(), S(S) {}
132 
133  static bool HasMacroID(const Expr *E) {
134  if (E->getExprLoc().isMacroID())
135  return true;
136 
137  // Recurse to children.
138  for (const Stmt *SubStmt : E->children())
139  if (const Expr *SubExpr = dyn_cast_or_null<Expr>(SubStmt))
140  if (HasMacroID(SubExpr))
141  return true;
142 
143  return false;
144  }
145 
146  void compareAlwaysTrue(const BinaryOperator *B, bool isAlwaysTrue) override {
147  if (HasMacroID(B))
148  return;
149 
150  SourceRange DiagRange = B->getSourceRange();
151  S.Diag(B->getExprLoc(), diag::warn_tautological_overlap_comparison)
152  << DiagRange << isAlwaysTrue;
153  }
154 
155  void compareBitwiseEquality(const BinaryOperator *B,
156  bool isAlwaysTrue) override {
157  if (HasMacroID(B))
158  return;
159 
160  SourceRange DiagRange = B->getSourceRange();
161  S.Diag(B->getExprLoc(), diag::warn_comparison_bitwise_always)
162  << DiagRange << isAlwaysTrue;
163  }
164 
165  void compareBitwiseOr(const BinaryOperator *B) override {
166  if (HasMacroID(B))
167  return;
168 
169  SourceRange DiagRange = B->getSourceRange();
170  S.Diag(B->getExprLoc(), diag::warn_comparison_bitwise_or) << DiagRange;
171  }
172 
173  static bool hasActiveDiagnostics(DiagnosticsEngine &Diags,
174  SourceLocation Loc) {
175  return !Diags.isIgnored(diag::warn_tautological_overlap_comparison, Loc) ||
176  !Diags.isIgnored(diag::warn_comparison_bitwise_or, Loc);
177  }
178 };
179 } // anonymous namespace
180 
181 //===----------------------------------------------------------------------===//
182 // Check for infinite self-recursion in functions
183 //===----------------------------------------------------------------------===//
184 
185 // Returns true if the function is called anywhere within the CFGBlock.
186 // For member functions, the additional condition of being call from the
187 // this pointer is required.
188 static bool hasRecursiveCallInPath(const FunctionDecl *FD, CFGBlock &Block) {
189  // Process all the Stmt's in this block to find any calls to FD.
190  for (const auto &B : Block) {
191  if (B.getKind() != CFGElement::Statement)
192  continue;
193 
194  const CallExpr *CE = dyn_cast<CallExpr>(B.getAs<CFGStmt>()->getStmt());
195  if (!CE || !CE->getCalleeDecl() ||
196  CE->getCalleeDecl()->getCanonicalDecl() != FD)
197  continue;
198 
199  // Skip function calls which are qualified with a templated class.
200  if (const DeclRefExpr *DRE =
201  dyn_cast<DeclRefExpr>(CE->getCallee()->IgnoreParenImpCasts())) {
202  if (NestedNameSpecifier *NNS = DRE->getQualifier()) {
203  if (NNS->getKind() == NestedNameSpecifier::TypeSpec &&
204  isa<TemplateSpecializationType>(NNS->getAsType())) {
205  continue;
206  }
207  }
208  }
209 
210  const CXXMemberCallExpr *MCE = dyn_cast<CXXMemberCallExpr>(CE);
211  if (!MCE || isa<CXXThisExpr>(MCE->getImplicitObjectArgument()) ||
212  !MCE->getMethodDecl()->isVirtual())
213  return true;
214  }
215  return false;
216 }
217 
218 // Returns true if every path from the entry block passes through a call to FD.
219 static bool checkForRecursiveFunctionCall(const FunctionDecl *FD, CFG *cfg) {
222  // Keep track of whether we found at least one recursive path.
223  bool foundRecursion = false;
224 
225  const unsigned ExitID = cfg->getExit().getBlockID();
226 
227  // Seed the work list with the entry block.
228  WorkList.push_back(&cfg->getEntry());
229 
230  while (!WorkList.empty()) {
231  CFGBlock *Block = WorkList.pop_back_val();
232 
233  for (auto I = Block->succ_begin(), E = Block->succ_end(); I != E; ++I) {
234  if (CFGBlock *SuccBlock = *I) {
235  if (!Visited.insert(SuccBlock).second)
236  continue;
237 
238  // Found a path to the exit node without a recursive call.
239  if (ExitID == SuccBlock->getBlockID())
240  return false;
241 
242  // If the successor block contains a recursive call, end analysis there.
243  if (hasRecursiveCallInPath(FD, *SuccBlock)) {
244  foundRecursion = true;
245  continue;
246  }
247 
248  WorkList.push_back(SuccBlock);
249  }
250  }
251  }
252  return foundRecursion;
253 }
254 
255 static void checkRecursiveFunction(Sema &S, const FunctionDecl *FD,
256  const Stmt *Body, AnalysisDeclContext &AC) {
257  FD = FD->getCanonicalDecl();
258 
259  // Only run on non-templated functions and non-templated members of
260  // templated classes.
263  return;
264 
265  CFG *cfg = AC.getCFG();
266  if (!cfg) return;
267 
268  // If the exit block is unreachable, skip processing the function.
269  if (cfg->getExit().pred_empty())
270  return;
271 
272  // Emit diagnostic if a recursive function call is detected for all paths.
273  if (checkForRecursiveFunctionCall(FD, cfg))
274  S.Diag(Body->getBeginLoc(), diag::warn_infinite_recursive_function);
275 }
276 
277 //===----------------------------------------------------------------------===//
278 // Check for throw in a non-throwing function.
279 //===----------------------------------------------------------------------===//
280 
281 /// Determine whether an exception thrown by E, unwinding from ThrowBlock,
282 /// can reach ExitBlock.
283 static bool throwEscapes(Sema &S, const CXXThrowExpr *E, CFGBlock &ThrowBlock,
284  CFG *Body) {
286  llvm::BitVector Queued(Body->getNumBlockIDs());
287 
288  Stack.push_back(&ThrowBlock);
289  Queued[ThrowBlock.getBlockID()] = true;
290 
291  while (!Stack.empty()) {
292  CFGBlock &UnwindBlock = *Stack.back();
293  Stack.pop_back();
294 
295  for (auto &Succ : UnwindBlock.succs()) {
296  if (!Succ.isReachable() || Queued[Succ->getBlockID()])
297  continue;
298 
299  if (Succ->getBlockID() == Body->getExit().getBlockID())
300  return true;
301 
302  if (auto *Catch =
303  dyn_cast_or_null<CXXCatchStmt>(Succ->getLabel())) {
304  QualType Caught = Catch->getCaughtType();
305  if (Caught.isNull() || // catch (...) catches everything
306  !E->getSubExpr() || // throw; is considered cuaght by any handler
307  S.handlerCanCatch(Caught, E->getSubExpr()->getType()))
308  // Exception doesn't escape via this path.
309  break;
310  } else {
311  Stack.push_back(Succ);
312  Queued[Succ->getBlockID()] = true;
313  }
314  }
315  }
316 
317  return false;
318 }
319 
321  CFG *BodyCFG,
322  llvm::function_ref<void(const CXXThrowExpr *, CFGBlock &)> Visit) {
323  llvm::BitVector Reachable(BodyCFG->getNumBlockIDs());
325  for (CFGBlock *B : *BodyCFG) {
326  if (!Reachable[B->getBlockID()])
327  continue;
328  for (CFGElement &E : *B) {
329  Optional<CFGStmt> S = E.getAs<CFGStmt>();
330  if (!S)
331  continue;
332  if (auto *Throw = dyn_cast<CXXThrowExpr>(S->getStmt()))
333  Visit(Throw, *B);
334  }
335  }
336 }
337 
339  const FunctionDecl *FD) {
340  if (!S.getSourceManager().isInSystemHeader(OpLoc) &&
341  FD->getTypeSourceInfo()) {
342  S.Diag(OpLoc, diag::warn_throw_in_noexcept_func) << FD;
343  if (S.getLangOpts().CPlusPlus11 &&
344  (isa<CXXDestructorDecl>(FD) ||
345  FD->getDeclName().getCXXOverloadedOperator() == OO_Delete ||
346  FD->getDeclName().getCXXOverloadedOperator() == OO_Array_Delete)) {
347  if (const auto *Ty = FD->getTypeSourceInfo()->getType()->
348  getAs<FunctionProtoType>())
349  S.Diag(FD->getLocation(), diag::note_throw_in_dtor)
350  << !isa<CXXDestructorDecl>(FD) << !Ty->hasExceptionSpec()
352  } else
353  S.Diag(FD->getLocation(), diag::note_throw_in_function)
355  }
356 }
357 
359  AnalysisDeclContext &AC) {
360  CFG *BodyCFG = AC.getCFG();
361  if (!BodyCFG)
362  return;
363  if (BodyCFG->getExit().pred_empty())
364  return;
365  visitReachableThrows(BodyCFG, [&](const CXXThrowExpr *Throw, CFGBlock &Block) {
366  if (throwEscapes(S, Throw, Block, BodyCFG))
368  });
369 }
370 
371 static bool isNoexcept(const FunctionDecl *FD) {
372  const auto *FPT = FD->getType()->castAs<FunctionProtoType>();
373  if (FPT->isNothrow() || FD->hasAttr<NoThrowAttr>())
374  return true;
375  return false;
376 }
377 
378 //===----------------------------------------------------------------------===//
379 // Check for missing return value.
380 //===----------------------------------------------------------------------===//
381 
388 };
389 
390 /// CheckFallThrough - Check that we don't fall off the end of a
391 /// Statement that should return a value.
392 ///
393 /// \returns AlwaysFallThrough iff we always fall off the end of the statement,
394 /// MaybeFallThrough iff we might or might not fall off the end,
395 /// NeverFallThroughOrReturn iff we never fall off the end of the statement or
396 /// return. We assume NeverFallThrough iff we never fall off the end of the
397 /// statement but we may return. We assume that functions not marked noreturn
398 /// will return.
400  CFG *cfg = AC.getCFG();
401  if (!cfg) return UnknownFallThrough;
402 
403  // The CFG leaves in dead things, and we don't want the dead code paths to
404  // confuse us, so we mark all live things first.
405  llvm::BitVector live(cfg->getNumBlockIDs());
406  unsigned count = reachable_code::ScanReachableFromBlock(&cfg->getEntry(),
407  live);
408 
409  bool AddEHEdges = AC.getAddEHEdges();
410  if (!AddEHEdges && count != cfg->getNumBlockIDs())
411  // When there are things remaining dead, and we didn't add EH edges
412  // from CallExprs to the catch clauses, we have to go back and
413  // mark them as live.
414  for (const auto *B : *cfg) {
415  if (!live[B->getBlockID()]) {
416  if (B->pred_begin() == B->pred_end()) {
417  const Stmt *Term = B->getTerminatorStmt();
418  if (Term && isa<CXXTryStmt>(Term))
419  // When not adding EH edges from calls, catch clauses
420  // can otherwise seem dead. Avoid noting them as dead.
421  count += reachable_code::ScanReachableFromBlock(B, live);
422  continue;
423  }
424  }
425  }
426 
427  // Now we know what is live, we check the live precessors of the exit block
428  // and look for fall through paths, being careful to ignore normal returns,
429  // and exceptional paths.
430  bool HasLiveReturn = false;
431  bool HasFakeEdge = false;
432  bool HasPlainEdge = false;
433  bool HasAbnormalEdge = false;
434 
435  // Ignore default cases that aren't likely to be reachable because all
436  // enums in a switch(X) have explicit case statements.
439 
441  cfg->getExit().filtered_pred_start_end(FO);
442  I.hasMore(); ++I) {
443  const CFGBlock &B = **I;
444  if (!live[B.getBlockID()])
445  continue;
446 
447  // Skip blocks which contain an element marked as no-return. They don't
448  // represent actually viable edges into the exit block, so mark them as
449  // abnormal.
450  if (B.hasNoReturnElement()) {
451  HasAbnormalEdge = true;
452  continue;
453  }
454 
455  // Destructors can appear after the 'return' in the CFG. This is
456  // normal. We need to look pass the destructors for the return
457  // statement (if it exists).
458  CFGBlock::const_reverse_iterator ri = B.rbegin(), re = B.rend();
459 
460  for ( ; ri != re ; ++ri)
461  if (ri->getAs<CFGStmt>())
462  break;
463 
464  // No more CFGElements in the block?
465  if (ri == re) {
466  const Stmt *Term = B.getTerminatorStmt();
467  if (Term && isa<CXXTryStmt>(Term)) {
468  HasAbnormalEdge = true;
469  continue;
470  }
471  // A labeled empty statement, or the entry block...
472  HasPlainEdge = true;
473  continue;
474  }
475 
476  CFGStmt CS = ri->castAs<CFGStmt>();
477  const Stmt *S = CS.getStmt();
478  if (isa<ReturnStmt>(S) || isa<CoreturnStmt>(S)) {
479  HasLiveReturn = true;
480  continue;
481  }
482  if (isa<ObjCAtThrowStmt>(S)) {
483  HasFakeEdge = true;
484  continue;
485  }
486  if (isa<CXXThrowExpr>(S)) {
487  HasFakeEdge = true;
488  continue;
489  }
490  if (isa<MSAsmStmt>(S)) {
491  // TODO: Verify this is correct.
492  HasFakeEdge = true;
493  HasLiveReturn = true;
494  continue;
495  }
496  if (isa<CXXTryStmt>(S)) {
497  HasAbnormalEdge = true;
498  continue;
499  }
500  if (std::find(B.succ_begin(), B.succ_end(), &cfg->getExit())
501  == B.succ_end()) {
502  HasAbnormalEdge = true;
503  continue;
504  }
505 
506  HasPlainEdge = true;
507  }
508  if (!HasPlainEdge) {
509  if (HasLiveReturn)
510  return NeverFallThrough;
512  }
513  if (HasAbnormalEdge || HasFakeEdge || HasLiveReturn)
514  return MaybeFallThrough;
515  // This says AlwaysFallThrough for calls to functions that are not marked
516  // noreturn, that don't return. If people would like this warning to be more
517  // accurate, such functions should be marked as noreturn.
518  return AlwaysFallThrough;
519 }
520 
521 namespace {
522 
523 struct CheckFallThroughDiagnostics {
524  unsigned diag_MaybeFallThrough_HasNoReturn;
525  unsigned diag_MaybeFallThrough_ReturnsNonVoid;
526  unsigned diag_AlwaysFallThrough_HasNoReturn;
527  unsigned diag_AlwaysFallThrough_ReturnsNonVoid;
528  unsigned diag_NeverFallThroughOrReturn;
529  enum { Function, Block, Lambda, Coroutine } funMode;
530  SourceLocation FuncLoc;
531 
532  static CheckFallThroughDiagnostics MakeForFunction(const Decl *Func) {
533  CheckFallThroughDiagnostics D;
534  D.FuncLoc = Func->getLocation();
535  D.diag_MaybeFallThrough_HasNoReturn =
536  diag::warn_falloff_noreturn_function;
537  D.diag_MaybeFallThrough_ReturnsNonVoid =
538  diag::warn_maybe_falloff_nonvoid_function;
539  D.diag_AlwaysFallThrough_HasNoReturn =
540  diag::warn_falloff_noreturn_function;
541  D.diag_AlwaysFallThrough_ReturnsNonVoid =
542  diag::warn_falloff_nonvoid_function;
543 
544  // Don't suggest that virtual functions be marked "noreturn", since they
545  // might be overridden by non-noreturn functions.
546  bool isVirtualMethod = false;
547  if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Func))
548  isVirtualMethod = Method->isVirtual();
549 
550  // Don't suggest that template instantiations be marked "noreturn"
551  bool isTemplateInstantiation = false;
552  if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(Func))
553  isTemplateInstantiation = Function->isTemplateInstantiation();
554 
555  if (!isVirtualMethod && !isTemplateInstantiation)
556  D.diag_NeverFallThroughOrReturn =
557  diag::warn_suggest_noreturn_function;
558  else
559  D.diag_NeverFallThroughOrReturn = 0;
560 
561  D.funMode = Function;
562  return D;
563  }
564 
565  static CheckFallThroughDiagnostics MakeForCoroutine(const Decl *Func) {
566  CheckFallThroughDiagnostics D;
567  D.FuncLoc = Func->getLocation();
568  D.diag_MaybeFallThrough_HasNoReturn = 0;
569  D.diag_MaybeFallThrough_ReturnsNonVoid =
570  diag::warn_maybe_falloff_nonvoid_coroutine;
571  D.diag_AlwaysFallThrough_HasNoReturn = 0;
572  D.diag_AlwaysFallThrough_ReturnsNonVoid =
573  diag::warn_falloff_nonvoid_coroutine;
574  D.funMode = Coroutine;
575  return D;
576  }
577 
578  static CheckFallThroughDiagnostics MakeForBlock() {
579  CheckFallThroughDiagnostics D;
580  D.diag_MaybeFallThrough_HasNoReturn =
581  diag::err_noreturn_block_has_return_expr;
582  D.diag_MaybeFallThrough_ReturnsNonVoid =
583  diag::err_maybe_falloff_nonvoid_block;
584  D.diag_AlwaysFallThrough_HasNoReturn =
585  diag::err_noreturn_block_has_return_expr;
586  D.diag_AlwaysFallThrough_ReturnsNonVoid =
587  diag::err_falloff_nonvoid_block;
588  D.diag_NeverFallThroughOrReturn = 0;
589  D.funMode = Block;
590  return D;
591  }
592 
593  static CheckFallThroughDiagnostics MakeForLambda() {
594  CheckFallThroughDiagnostics D;
595  D.diag_MaybeFallThrough_HasNoReturn =
596  diag::err_noreturn_lambda_has_return_expr;
597  D.diag_MaybeFallThrough_ReturnsNonVoid =
598  diag::warn_maybe_falloff_nonvoid_lambda;
599  D.diag_AlwaysFallThrough_HasNoReturn =
600  diag::err_noreturn_lambda_has_return_expr;
601  D.diag_AlwaysFallThrough_ReturnsNonVoid =
602  diag::warn_falloff_nonvoid_lambda;
603  D.diag_NeverFallThroughOrReturn = 0;
604  D.funMode = Lambda;
605  return D;
606  }
607 
608  bool checkDiagnostics(DiagnosticsEngine &D, bool ReturnsVoid,
609  bool HasNoReturn) const {
610  if (funMode == Function) {
611  return (ReturnsVoid ||
612  D.isIgnored(diag::warn_maybe_falloff_nonvoid_function,
613  FuncLoc)) &&
614  (!HasNoReturn ||
615  D.isIgnored(diag::warn_noreturn_function_has_return_expr,
616  FuncLoc)) &&
617  (!ReturnsVoid ||
618  D.isIgnored(diag::warn_suggest_noreturn_block, FuncLoc));
619  }
620  if (funMode == Coroutine) {
621  return (ReturnsVoid ||
622  D.isIgnored(diag::warn_maybe_falloff_nonvoid_function, FuncLoc) ||
623  D.isIgnored(diag::warn_maybe_falloff_nonvoid_coroutine,
624  FuncLoc)) &&
625  (!HasNoReturn);
626  }
627  // For blocks / lambdas.
628  return ReturnsVoid && !HasNoReturn;
629  }
630 };
631 
632 } // anonymous namespace
633 
634 /// CheckFallThroughForBody - Check that we don't fall off the end of a
635 /// function that should return a value. Check that we don't fall off the end
636 /// of a noreturn function. We assume that functions and blocks not marked
637 /// noreturn will return.
638 static void CheckFallThroughForBody(Sema &S, const Decl *D, const Stmt *Body,
639  QualType BlockType,
640  const CheckFallThroughDiagnostics &CD,
643 
644  bool ReturnsVoid = false;
645  bool HasNoReturn = false;
646  bool IsCoroutine = FSI->isCoroutine();
647 
648  if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
649  if (const auto *CBody = dyn_cast<CoroutineBodyStmt>(Body))
650  ReturnsVoid = CBody->getFallthroughHandler() != nullptr;
651  else
652  ReturnsVoid = FD->getReturnType()->isVoidType();
653  HasNoReturn = FD->isNoReturn();
654  }
655  else if (const auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
656  ReturnsVoid = MD->getReturnType()->isVoidType();
657  HasNoReturn = MD->hasAttr<NoReturnAttr>();
658  }
659  else if (isa<BlockDecl>(D)) {
660  if (const FunctionType *FT =
661  BlockType->getPointeeType()->getAs<FunctionType>()) {
662  if (FT->getReturnType()->isVoidType())
663  ReturnsVoid = true;
664  if (FT->getNoReturnAttr())
665  HasNoReturn = true;
666  }
667  }
668 
669  DiagnosticsEngine &Diags = S.getDiagnostics();
670 
671  // Short circuit for compilation speed.
672  if (CD.checkDiagnostics(Diags, ReturnsVoid, HasNoReturn))
673  return;
674  SourceLocation LBrace = Body->getBeginLoc(), RBrace = Body->getEndLoc();
675  auto EmitDiag = [&](SourceLocation Loc, unsigned DiagID) {
676  if (IsCoroutine)
677  S.Diag(Loc, DiagID) << FSI->CoroutinePromise->getType();
678  else
679  S.Diag(Loc, DiagID);
680  };
681 
682  // cpu_dispatch functions permit empty function bodies for ICC compatibility.
684  return;
685 
686  // Either in a function body compound statement, or a function-try-block.
687  switch (CheckFallThrough(AC)) {
688  case UnknownFallThrough:
689  break;
690 
691  case MaybeFallThrough:
692  if (HasNoReturn)
693  EmitDiag(RBrace, CD.diag_MaybeFallThrough_HasNoReturn);
694  else if (!ReturnsVoid)
695  EmitDiag(RBrace, CD.diag_MaybeFallThrough_ReturnsNonVoid);
696  break;
697  case AlwaysFallThrough:
698  if (HasNoReturn)
699  EmitDiag(RBrace, CD.diag_AlwaysFallThrough_HasNoReturn);
700  else if (!ReturnsVoid)
701  EmitDiag(RBrace, CD.diag_AlwaysFallThrough_ReturnsNonVoid);
702  break;
704  if (ReturnsVoid && !HasNoReturn && CD.diag_NeverFallThroughOrReturn) {
705  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
706  S.Diag(LBrace, CD.diag_NeverFallThroughOrReturn) << 0 << FD;
707  } else if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
708  S.Diag(LBrace, CD.diag_NeverFallThroughOrReturn) << 1 << MD;
709  } else {
710  S.Diag(LBrace, CD.diag_NeverFallThroughOrReturn);
711  }
712  }
713  break;
714  case NeverFallThrough:
715  break;
716  }
717 }
718 
719 //===----------------------------------------------------------------------===//
720 // -Wuninitialized
721 //===----------------------------------------------------------------------===//
722 
723 namespace {
724 /// ContainsReference - A visitor class to search for references to
725 /// a particular declaration (the needle) within any evaluated component of an
726 /// expression (recursively).
727 class ContainsReference : public ConstEvaluatedExprVisitor<ContainsReference> {
728  bool FoundReference;
729  const DeclRefExpr *Needle;
730 
731 public:
733 
734  ContainsReference(ASTContext &Context, const DeclRefExpr *Needle)
735  : Inherited(Context), FoundReference(false), Needle(Needle) {}
736 
737  void VisitExpr(const Expr *E) {
738  // Stop evaluating if we already have a reference.
739  if (FoundReference)
740  return;
741 
742  Inherited::VisitExpr(E);
743  }
744 
745  void VisitDeclRefExpr(const DeclRefExpr *E) {
746  if (E == Needle)
747  FoundReference = true;
748  else
749  Inherited::VisitDeclRefExpr(E);
750  }
751 
752  bool doesContainReference() const { return FoundReference; }
753 };
754 } // anonymous namespace
755 
756 static bool SuggestInitializationFixit(Sema &S, const VarDecl *VD) {
757  QualType VariableTy = VD->getType().getCanonicalType();
758  if (VariableTy->isBlockPointerType() &&
759  !VD->hasAttr<BlocksAttr>()) {
760  S.Diag(VD->getLocation(), diag::note_block_var_fixit_add_initialization)
761  << VD->getDeclName()
762  << FixItHint::CreateInsertion(VD->getLocation(), "__block ");
763  return true;
764  }
765 
766  // Don't issue a fixit if there is already an initializer.
767  if (VD->getInit())
768  return false;
769 
770  // Don't suggest a fixit inside macros.
771  if (VD->getEndLoc().isMacroID())
772  return false;
773 
775 
776  // Suggest possible initialization (if any).
777  std::string Init = S.getFixItZeroInitializerForType(VariableTy, Loc);
778  if (Init.empty())
779  return false;
780 
781  S.Diag(Loc, diag::note_var_fixit_add_initialization) << VD->getDeclName()
782  << FixItHint::CreateInsertion(Loc, Init);
783  return true;
784 }
785 
786 /// Create a fixit to remove an if-like statement, on the assumption that its
787 /// condition is CondVal.
788 static void CreateIfFixit(Sema &S, const Stmt *If, const Stmt *Then,
789  const Stmt *Else, bool CondVal,
790  FixItHint &Fixit1, FixItHint &Fixit2) {
791  if (CondVal) {
792  // If condition is always true, remove all but the 'then'.
793  Fixit1 = FixItHint::CreateRemoval(
795  if (Else) {
796  SourceLocation ElseKwLoc = S.getLocForEndOfToken(Then->getEndLoc());
797  Fixit2 =
798  FixItHint::CreateRemoval(SourceRange(ElseKwLoc, Else->getEndLoc()));
799  }
800  } else {
801  // If condition is always false, remove all but the 'else'.
802  if (Else)
804  If->getBeginLoc(), Else->getBeginLoc()));
805  else
807  }
808 }
809 
810 /// DiagUninitUse -- Helper function to produce a diagnostic for an
811 /// uninitialized use of a variable.
812 static void DiagUninitUse(Sema &S, const VarDecl *VD, const UninitUse &Use,
813  bool IsCapturedByBlock) {
814  bool Diagnosed = false;
815 
816  switch (Use.getKind()) {
817  case UninitUse::Always:
818  S.Diag(Use.getUser()->getBeginLoc(), diag::warn_uninit_var)
819  << VD->getDeclName() << IsCapturedByBlock
820  << Use.getUser()->getSourceRange();
821  return;
822 
825  S.Diag(VD->getLocation(), diag::warn_sometimes_uninit_var)
826  << VD->getDeclName() << IsCapturedByBlock
827  << (Use.getKind() == UninitUse::AfterDecl ? 4 : 5)
828  << const_cast<DeclContext*>(VD->getLexicalDeclContext())
829  << VD->getSourceRange();
830  S.Diag(Use.getUser()->getBeginLoc(), diag::note_uninit_var_use)
831  << IsCapturedByBlock << Use.getUser()->getSourceRange();
832  return;
833 
834  case UninitUse::Maybe:
836  // Carry on to report sometimes-uninitialized branches, if possible,
837  // or a 'may be used uninitialized' diagnostic otherwise.
838  break;
839  }
840 
841  // Diagnose each branch which leads to a sometimes-uninitialized use.
842  for (UninitUse::branch_iterator I = Use.branch_begin(), E = Use.branch_end();
843  I != E; ++I) {
844  assert(Use.getKind() == UninitUse::Sometimes);
845 
846  const Expr *User = Use.getUser();
847  const Stmt *Term = I->Terminator;
848 
849  // Information used when building the diagnostic.
850  unsigned DiagKind;
851  StringRef Str;
852  SourceRange Range;
853 
854  // FixIts to suppress the diagnostic by removing the dead condition.
855  // For all binary terminators, branch 0 is taken if the condition is true,
856  // and branch 1 is taken if the condition is false.
857  int RemoveDiagKind = -1;
858  const char *FixitStr =
859  S.getLangOpts().CPlusPlus ? (I->Output ? "true" : "false")
860  : (I->Output ? "1" : "0");
861  FixItHint Fixit1, Fixit2;
862 
863  switch (Term ? Term->getStmtClass() : Stmt::DeclStmtClass) {
864  default:
865  // Don't know how to report this. Just fall back to 'may be used
866  // uninitialized'. FIXME: Can this happen?
867  continue;
868 
869  // "condition is true / condition is false".
870  case Stmt::IfStmtClass: {
871  const IfStmt *IS = cast<IfStmt>(Term);
872  DiagKind = 0;
873  Str = "if";
874  Range = IS->getCond()->getSourceRange();
875  RemoveDiagKind = 0;
876  CreateIfFixit(S, IS, IS->getThen(), IS->getElse(),
877  I->Output, Fixit1, Fixit2);
878  break;
879  }
880  case Stmt::ConditionalOperatorClass: {
881  const ConditionalOperator *CO = cast<ConditionalOperator>(Term);
882  DiagKind = 0;
883  Str = "?:";
884  Range = CO->getCond()->getSourceRange();
885  RemoveDiagKind = 0;
886  CreateIfFixit(S, CO, CO->getTrueExpr(), CO->getFalseExpr(),
887  I->Output, Fixit1, Fixit2);
888  break;
889  }
890  case Stmt::BinaryOperatorClass: {
891  const BinaryOperator *BO = cast<BinaryOperator>(Term);
892  if (!BO->isLogicalOp())
893  continue;
894  DiagKind = 0;
895  Str = BO->getOpcodeStr();
896  Range = BO->getLHS()->getSourceRange();
897  RemoveDiagKind = 0;
898  if ((BO->getOpcode() == BO_LAnd && I->Output) ||
899  (BO->getOpcode() == BO_LOr && !I->Output))
900  // true && y -> y, false || y -> y.
901  Fixit1 = FixItHint::CreateRemoval(
902  SourceRange(BO->getBeginLoc(), BO->getOperatorLoc()));
903  else
904  // false && y -> false, true || y -> true.
905  Fixit1 = FixItHint::CreateReplacement(BO->getSourceRange(), FixitStr);
906  break;
907  }
908 
909  // "loop is entered / loop is exited".
910  case Stmt::WhileStmtClass:
911  DiagKind = 1;
912  Str = "while";
913  Range = cast<WhileStmt>(Term)->getCond()->getSourceRange();
914  RemoveDiagKind = 1;
915  Fixit1 = FixItHint::CreateReplacement(Range, FixitStr);
916  break;
917  case Stmt::ForStmtClass:
918  DiagKind = 1;
919  Str = "for";
920  Range = cast<ForStmt>(Term)->getCond()->getSourceRange();
921  RemoveDiagKind = 1;
922  if (I->Output)
923  Fixit1 = FixItHint::CreateRemoval(Range);
924  else
925  Fixit1 = FixItHint::CreateReplacement(Range, FixitStr);
926  break;
927  case Stmt::CXXForRangeStmtClass:
928  if (I->Output == 1) {
929  // The use occurs if a range-based for loop's body never executes.
930  // That may be impossible, and there's no syntactic fix for this,
931  // so treat it as a 'may be uninitialized' case.
932  continue;
933  }
934  DiagKind = 1;
935  Str = "for";
936  Range = cast<CXXForRangeStmt>(Term)->getRangeInit()->getSourceRange();
937  break;
938 
939  // "condition is true / loop is exited".
940  case Stmt::DoStmtClass:
941  DiagKind = 2;
942  Str = "do";
943  Range = cast<DoStmt>(Term)->getCond()->getSourceRange();
944  RemoveDiagKind = 1;
945  Fixit1 = FixItHint::CreateReplacement(Range, FixitStr);
946  break;
947 
948  // "switch case is taken".
949  case Stmt::CaseStmtClass:
950  DiagKind = 3;
951  Str = "case";
952  Range = cast<CaseStmt>(Term)->getLHS()->getSourceRange();
953  break;
954  case Stmt::DefaultStmtClass:
955  DiagKind = 3;
956  Str = "default";
957  Range = cast<DefaultStmt>(Term)->getDefaultLoc();
958  break;
959  }
960 
961  S.Diag(Range.getBegin(), diag::warn_sometimes_uninit_var)
962  << VD->getDeclName() << IsCapturedByBlock << DiagKind
963  << Str << I->Output << Range;
964  S.Diag(User->getBeginLoc(), diag::note_uninit_var_use)
965  << IsCapturedByBlock << User->getSourceRange();
966  if (RemoveDiagKind != -1)
967  S.Diag(Fixit1.RemoveRange.getBegin(), diag::note_uninit_fixit_remove_cond)
968  << RemoveDiagKind << Str << I->Output << Fixit1 << Fixit2;
969 
970  Diagnosed = true;
971  }
972 
973  if (!Diagnosed)
974  S.Diag(Use.getUser()->getBeginLoc(), diag::warn_maybe_uninit_var)
975  << VD->getDeclName() << IsCapturedByBlock
976  << Use.getUser()->getSourceRange();
977 }
978 
979 /// Diagnose uninitialized const reference usages.
981  const UninitUse &Use) {
982  S.Diag(Use.getUser()->getBeginLoc(), diag::warn_uninit_const_reference)
983  << VD->getDeclName() << Use.getUser()->getSourceRange();
984  return true;
985 }
986 
987 /// DiagnoseUninitializedUse -- Helper function for diagnosing uses of an
988 /// uninitialized variable. This manages the different forms of diagnostic
989 /// emitted for particular types of uses. Returns true if the use was diagnosed
990 /// as a warning. If a particular use is one we omit warnings for, returns
991 /// false.
992 static bool DiagnoseUninitializedUse(Sema &S, const VarDecl *VD,
993  const UninitUse &Use,
994  bool alwaysReportSelfInit = false) {
995  if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Use.getUser())) {
996  // Inspect the initializer of the variable declaration which is
997  // being referenced prior to its initialization. We emit
998  // specialized diagnostics for self-initialization, and we
999  // specifically avoid warning about self references which take the
1000  // form of:
1001  //
1002  // int x = x;
1003  //
1004  // This is used to indicate to GCC that 'x' is intentionally left
1005  // uninitialized. Proven code paths which access 'x' in
1006  // an uninitialized state after this will still warn.
1007  if (const Expr *Initializer = VD->getInit()) {
1008  if (!alwaysReportSelfInit && DRE == Initializer->IgnoreParenImpCasts())
1009  return false;
1010 
1011  ContainsReference CR(S.Context, DRE);
1012  CR.Visit(Initializer);
1013  if (CR.doesContainReference()) {
1014  S.Diag(DRE->getBeginLoc(), diag::warn_uninit_self_reference_in_init)
1015  << VD->getDeclName() << VD->getLocation() << DRE->getSourceRange();
1016  return true;
1017  }
1018  }
1019 
1020  DiagUninitUse(S, VD, Use, false);
1021  } else {
1022  const BlockExpr *BE = cast<BlockExpr>(Use.getUser());
1023  if (VD->getType()->isBlockPointerType() && !VD->hasAttr<BlocksAttr>())
1024  S.Diag(BE->getBeginLoc(),
1025  diag::warn_uninit_byref_blockvar_captured_by_block)
1026  << VD->getDeclName()
1027  << VD->getType().getQualifiers().hasObjCLifetime();
1028  else
1029  DiagUninitUse(S, VD, Use, true);
1030  }
1031 
1032  // Report where the variable was declared when the use wasn't within
1033  // the initializer of that declaration & we didn't already suggest
1034  // an initialization fixit.
1035  if (!SuggestInitializationFixit(S, VD))
1036  S.Diag(VD->getBeginLoc(), diag::note_var_declared_here)
1037  << VD->getDeclName();
1038 
1039  return true;
1040 }
1041 
1042 namespace {
1043  class FallthroughMapper : public RecursiveASTVisitor<FallthroughMapper> {
1044  public:
1045  FallthroughMapper(Sema &S)
1046  : FoundSwitchStatements(false),
1047  S(S) {
1048  }
1049 
1050  bool foundSwitchStatements() const { return FoundSwitchStatements; }
1051 
1052  void markFallthroughVisited(const AttributedStmt *Stmt) {
1053  bool Found = FallthroughStmts.erase(Stmt);
1054  assert(Found);
1055  (void)Found;
1056  }
1057 
1059 
1060  const AttrStmts &getFallthroughStmts() const {
1061  return FallthroughStmts;
1062  }
1063 
1064  void fillReachableBlocks(CFG *Cfg) {
1065  assert(ReachableBlocks.empty() && "ReachableBlocks already filled");
1066  std::deque<const CFGBlock *> BlockQueue;
1067 
1068  ReachableBlocks.insert(&Cfg->getEntry());
1069  BlockQueue.push_back(&Cfg->getEntry());
1070  // Mark all case blocks reachable to avoid problems with switching on
1071  // constants, covered enums, etc.
1072  // These blocks can contain fall-through annotations, and we don't want to
1073  // issue a warn_fallthrough_attr_unreachable for them.
1074  for (const auto *B : *Cfg) {
1075  const Stmt *L = B->getLabel();
1076  if (L && isa<SwitchCase>(L) && ReachableBlocks.insert(B).second)
1077  BlockQueue.push_back(B);
1078  }
1079 
1080  while (!BlockQueue.empty()) {
1081  const CFGBlock *P = BlockQueue.front();
1082  BlockQueue.pop_front();
1083  for (CFGBlock::const_succ_iterator I = P->succ_begin(),
1084  E = P->succ_end();
1085  I != E; ++I) {
1086  if (*I && ReachableBlocks.insert(*I).second)
1087  BlockQueue.push_back(*I);
1088  }
1089  }
1090  }
1091 
1092  bool checkFallThroughIntoBlock(const CFGBlock &B, int &AnnotatedCnt,
1093  bool IsTemplateInstantiation) {
1094  assert(!ReachableBlocks.empty() && "ReachableBlocks empty");
1095 
1096  int UnannotatedCnt = 0;
1097  AnnotatedCnt = 0;
1098 
1099  std::deque<const CFGBlock*> BlockQueue(B.pred_begin(), B.pred_end());
1100  while (!BlockQueue.empty()) {
1101  const CFGBlock *P = BlockQueue.front();
1102  BlockQueue.pop_front();
1103  if (!P) continue;
1104 
1105  const Stmt *Term = P->getTerminatorStmt();
1106  if (Term && isa<SwitchStmt>(Term))
1107  continue; // Switch statement, good.
1108 
1109  const SwitchCase *SW = dyn_cast_or_null<SwitchCase>(P->getLabel());
1110  if (SW && SW->getSubStmt() == B.getLabel() && P->begin() == P->end())
1111  continue; // Previous case label has no statements, good.
1112 
1113  const LabelStmt *L = dyn_cast_or_null<LabelStmt>(P->getLabel());
1114  if (L && L->getSubStmt() == B.getLabel() && P->begin() == P->end())
1115  continue; // Case label is preceded with a normal label, good.
1116 
1117  if (!ReachableBlocks.count(P)) {
1118  for (CFGBlock::const_reverse_iterator ElemIt = P->rbegin(),
1119  ElemEnd = P->rend();
1120  ElemIt != ElemEnd; ++ElemIt) {
1121  if (Optional<CFGStmt> CS = ElemIt->getAs<CFGStmt>()) {
1122  if (const AttributedStmt *AS = asFallThroughAttr(CS->getStmt())) {
1123  // Don't issue a warning for an unreachable fallthrough
1124  // attribute in template instantiations as it may not be
1125  // unreachable in all instantiations of the template.
1126  if (!IsTemplateInstantiation)
1127  S.Diag(AS->getBeginLoc(),
1128  diag::warn_fallthrough_attr_unreachable);
1129  markFallthroughVisited(AS);
1130  ++AnnotatedCnt;
1131  break;
1132  }
1133  // Don't care about other unreachable statements.
1134  }
1135  }
1136  // If there are no unreachable statements, this may be a special
1137  // case in CFG:
1138  // case X: {
1139  // A a; // A has a destructor.
1140  // break;
1141  // }
1142  // // <<<< This place is represented by a 'hanging' CFG block.
1143  // case Y:
1144  continue;
1145  }
1146 
1147  const Stmt *LastStmt = getLastStmt(*P);
1148  if (const AttributedStmt *AS = asFallThroughAttr(LastStmt)) {
1149  markFallthroughVisited(AS);
1150  ++AnnotatedCnt;
1151  continue; // Fallthrough annotation, good.
1152  }
1153 
1154  if (!LastStmt) { // This block contains no executable statements.
1155  // Traverse its predecessors.
1156  std::copy(P->pred_begin(), P->pred_end(),
1157  std::back_inserter(BlockQueue));
1158  continue;
1159  }
1160 
1161  ++UnannotatedCnt;
1162  }
1163  return !!UnannotatedCnt;
1164  }
1165 
1166  // RecursiveASTVisitor setup.
1167  bool shouldWalkTypesOfTypeLocs() const { return false; }
1168 
1169  bool VisitAttributedStmt(AttributedStmt *S) {
1170  if (asFallThroughAttr(S))
1171  FallthroughStmts.insert(S);
1172  return true;
1173  }
1174 
1175  bool VisitSwitchStmt(SwitchStmt *S) {
1176  FoundSwitchStatements = true;
1177  return true;
1178  }
1179 
1180  // We don't want to traverse local type declarations. We analyze their
1181  // methods separately.
1182  bool TraverseDecl(Decl *D) { return true; }
1183 
1184  // We analyze lambda bodies separately. Skip them here.
1185  bool TraverseLambdaExpr(LambdaExpr *LE) {
1186  // Traverse the captures, but not the body.
1187  for (const auto C : zip(LE->captures(), LE->capture_inits()))
1188  TraverseLambdaCapture(LE, &std::get<0>(C), std::get<1>(C));
1189  return true;
1190  }
1191 
1192  private:
1193 
1194  static const AttributedStmt *asFallThroughAttr(const Stmt *S) {
1195  if (const AttributedStmt *AS = dyn_cast_or_null<AttributedStmt>(S)) {
1196  if (hasSpecificAttr<FallThroughAttr>(AS->getAttrs()))
1197  return AS;
1198  }
1199  return nullptr;
1200  }
1201 
1202  static const Stmt *getLastStmt(const CFGBlock &B) {
1203  if (const Stmt *Term = B.getTerminatorStmt())
1204  return Term;
1205  for (CFGBlock::const_reverse_iterator ElemIt = B.rbegin(),
1206  ElemEnd = B.rend();
1207  ElemIt != ElemEnd; ++ElemIt) {
1208  if (Optional<CFGStmt> CS = ElemIt->getAs<CFGStmt>())
1209  return CS->getStmt();
1210  }
1211  // Workaround to detect a statement thrown out by CFGBuilder:
1212  // case X: {} case Y:
1213  // case X: ; case Y:
1214  if (const SwitchCase *SW = dyn_cast_or_null<SwitchCase>(B.getLabel()))
1215  if (!isa<SwitchCase>(SW->getSubStmt()))
1216  return SW->getSubStmt();
1217 
1218  return nullptr;
1219  }
1220 
1221  bool FoundSwitchStatements;
1222  AttrStmts FallthroughStmts;
1223  Sema &S;
1225  };
1226 } // anonymous namespace
1227 
1229  SourceLocation Loc) {
1230  TokenValue FallthroughTokens[] = {
1231  tok::l_square, tok::l_square,
1232  PP.getIdentifierInfo("fallthrough"),
1233  tok::r_square, tok::r_square
1234  };
1235 
1236  TokenValue ClangFallthroughTokens[] = {
1237  tok::l_square, tok::l_square, PP.getIdentifierInfo("clang"),
1238  tok::coloncolon, PP.getIdentifierInfo("fallthrough"),
1239  tok::r_square, tok::r_square
1240  };
1241 
1242  bool PreferClangAttr = !PP.getLangOpts().CPlusPlus17 && !PP.getLangOpts().C2x;
1243 
1244  StringRef MacroName;
1245  if (PreferClangAttr)
1246  MacroName = PP.getLastMacroWithSpelling(Loc, ClangFallthroughTokens);
1247  if (MacroName.empty())
1248  MacroName = PP.getLastMacroWithSpelling(Loc, FallthroughTokens);
1249  if (MacroName.empty() && !PreferClangAttr)
1250  MacroName = PP.getLastMacroWithSpelling(Loc, ClangFallthroughTokens);
1251  if (MacroName.empty()) {
1252  if (!PreferClangAttr)
1253  MacroName = "[[fallthrough]]";
1254  else if (PP.getLangOpts().CPlusPlus)
1255  MacroName = "[[clang::fallthrough]]";
1256  else
1257  MacroName = "__attribute__((fallthrough))";
1258  }
1259  return MacroName;
1260 }
1261 
1263  bool PerFunction) {
1264  FallthroughMapper FM(S);
1265  FM.TraverseStmt(AC.getBody());
1266 
1267  if (!FM.foundSwitchStatements())
1268  return;
1269 
1270  if (PerFunction && FM.getFallthroughStmts().empty())
1271  return;
1272 
1273  CFG *Cfg = AC.getCFG();
1274 
1275  if (!Cfg)
1276  return;
1277 
1278  FM.fillReachableBlocks(Cfg);
1279 
1280  for (const CFGBlock *B : llvm::reverse(*Cfg)) {
1281  const Stmt *Label = B->getLabel();
1282 
1283  if (!Label || !isa<SwitchCase>(Label))
1284  continue;
1285 
1286  int AnnotatedCnt;
1287 
1288  bool IsTemplateInstantiation = false;
1289  if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(AC.getDecl()))
1290  IsTemplateInstantiation = Function->isTemplateInstantiation();
1291  if (!FM.checkFallThroughIntoBlock(*B, AnnotatedCnt,
1292  IsTemplateInstantiation))
1293  continue;
1294 
1295  S.Diag(Label->getBeginLoc(),
1296  PerFunction ? diag::warn_unannotated_fallthrough_per_function
1297  : diag::warn_unannotated_fallthrough);
1298 
1299  if (!AnnotatedCnt) {
1300  SourceLocation L = Label->getBeginLoc();
1301  if (L.isMacroID())
1302  continue;
1303 
1304  const Stmt *Term = B->getTerminatorStmt();
1305  // Skip empty cases.
1306  while (B->empty() && !Term && B->succ_size() == 1) {
1307  B = *B->succ_begin();
1308  Term = B->getTerminatorStmt();
1309  }
1310  if (!(B->empty() && Term && isa<BreakStmt>(Term))) {
1311  Preprocessor &PP = S.getPreprocessor();
1312  StringRef AnnotationSpelling = getFallthroughAttrSpelling(PP, L);
1313  SmallString<64> TextToInsert(AnnotationSpelling);
1314  TextToInsert += "; ";
1315  S.Diag(L, diag::note_insert_fallthrough_fixit)
1316  << AnnotationSpelling
1317  << FixItHint::CreateInsertion(L, TextToInsert);
1318  }
1319  S.Diag(L, diag::note_insert_break_fixit)
1320  << FixItHint::CreateInsertion(L, "break; ");
1321  }
1322  }
1323 
1324  for (const auto *F : FM.getFallthroughStmts())
1325  S.Diag(F->getBeginLoc(), diag::err_fallthrough_attr_invalid_placement);
1326 }
1327 
1328 static bool isInLoop(const ASTContext &Ctx, const ParentMap &PM,
1329  const Stmt *S) {
1330  assert(S);
1331 
1332  do {
1333  switch (S->getStmtClass()) {
1334  case Stmt::ForStmtClass:
1335  case Stmt::WhileStmtClass:
1336  case Stmt::CXXForRangeStmtClass:
1337  case Stmt::ObjCForCollectionStmtClass:
1338  return true;
1339  case Stmt::DoStmtClass: {
1340  Expr::EvalResult Result;
1341  if (!cast<DoStmt>(S)->getCond()->EvaluateAsInt(Result, Ctx))
1342  return true;
1343  return Result.Val.getInt().getBoolValue();
1344  }
1345  default:
1346  break;
1347  }
1348  } while ((S = PM.getParent(S)));
1349 
1350  return false;
1351 }
1352 
1354  const sema::FunctionScopeInfo *CurFn,
1355  const Decl *D,
1356  const ParentMap &PM) {
1357  typedef sema::FunctionScopeInfo::WeakObjectProfileTy WeakObjectProfileTy;
1358  typedef sema::FunctionScopeInfo::WeakObjectUseMap WeakObjectUseMap;
1359  typedef sema::FunctionScopeInfo::WeakUseVector WeakUseVector;
1360  typedef std::pair<const Stmt *, WeakObjectUseMap::const_iterator>
1361  StmtUsesPair;
1362 
1363  ASTContext &Ctx = S.getASTContext();
1364 
1365  const WeakObjectUseMap &WeakMap = CurFn->getWeakObjectUses();
1366 
1367  // Extract all weak objects that are referenced more than once.
1368  SmallVector<StmtUsesPair, 8> UsesByStmt;
1369  for (WeakObjectUseMap::const_iterator I = WeakMap.begin(), E = WeakMap.end();
1370  I != E; ++I) {
1371  const WeakUseVector &Uses = I->second;
1372 
1373  // Find the first read of the weak object.
1374  WeakUseVector::const_iterator UI = Uses.begin(), UE = Uses.end();
1375  for ( ; UI != UE; ++UI) {
1376  if (UI->isUnsafe())
1377  break;
1378  }
1379 
1380  // If there were only writes to this object, don't warn.
1381  if (UI == UE)
1382  continue;
1383 
1384  // If there was only one read, followed by any number of writes, and the
1385  // read is not within a loop, don't warn. Additionally, don't warn in a
1386  // loop if the base object is a local variable -- local variables are often
1387  // changed in loops.
1388  if (UI == Uses.begin()) {
1389  WeakUseVector::const_iterator UI2 = UI;
1390  for (++UI2; UI2 != UE; ++UI2)
1391  if (UI2->isUnsafe())
1392  break;
1393 
1394  if (UI2 == UE) {
1395  if (!isInLoop(Ctx, PM, UI->getUseExpr()))
1396  continue;
1397 
1398  const WeakObjectProfileTy &Profile = I->first;
1399  if (!Profile.isExactProfile())
1400  continue;
1401 
1402  const NamedDecl *Base = Profile.getBase();
1403  if (!Base)
1404  Base = Profile.getProperty();
1405  assert(Base && "A profile always has a base or property.");
1406 
1407  if (const VarDecl *BaseVar = dyn_cast<VarDecl>(Base))
1408  if (BaseVar->hasLocalStorage() && !isa<ParmVarDecl>(Base))
1409  continue;
1410  }
1411  }
1412 
1413  UsesByStmt.push_back(StmtUsesPair(UI->getUseExpr(), I));
1414  }
1415 
1416  if (UsesByStmt.empty())
1417  return;
1418 
1419  // Sort by first use so that we emit the warnings in a deterministic order.
1421  llvm::sort(UsesByStmt,
1422  [&SM](const StmtUsesPair &LHS, const StmtUsesPair &RHS) {
1423  return SM.isBeforeInTranslationUnit(LHS.first->getBeginLoc(),
1424  RHS.first->getBeginLoc());
1425  });
1426 
1427  // Classify the current code body for better warning text.
1428  // This enum should stay in sync with the cases in
1429  // warn_arc_repeated_use_of_weak and warn_arc_possible_repeated_use_of_weak.
1430  // FIXME: Should we use a common classification enum and the same set of
1431  // possibilities all throughout Sema?
1432  enum {
1433  Function,
1434  Method,
1435  Block,
1436  Lambda
1437  } FunctionKind;
1438 
1439  if (isa<sema::BlockScopeInfo>(CurFn))
1440  FunctionKind = Block;
1441  else if (isa<sema::LambdaScopeInfo>(CurFn))
1442  FunctionKind = Lambda;
1443  else if (isa<ObjCMethodDecl>(D))
1444  FunctionKind = Method;
1445  else
1446  FunctionKind = Function;
1447 
1448  // Iterate through the sorted problems and emit warnings for each.
1449  for (const auto &P : UsesByStmt) {
1450  const Stmt *FirstRead = P.first;
1451  const WeakObjectProfileTy &Key = P.second->first;
1452  const WeakUseVector &Uses = P.second->second;
1453 
1454  // For complicated expressions like 'a.b.c' and 'x.b.c', WeakObjectProfileTy
1455  // may not contain enough information to determine that these are different
1456  // properties. We can only be 100% sure of a repeated use in certain cases,
1457  // and we adjust the diagnostic kind accordingly so that the less certain
1458  // case can be turned off if it is too noisy.
1459  unsigned DiagKind;
1460  if (Key.isExactProfile())
1461  DiagKind = diag::warn_arc_repeated_use_of_weak;
1462  else
1463  DiagKind = diag::warn_arc_possible_repeated_use_of_weak;
1464 
1465  // Classify the weak object being accessed for better warning text.
1466  // This enum should stay in sync with the cases in
1467  // warn_arc_repeated_use_of_weak and warn_arc_possible_repeated_use_of_weak.
1468  enum {
1469  Variable,
1470  Property,
1471  ImplicitProperty,
1472  Ivar
1473  } ObjectKind;
1474 
1475  const NamedDecl *KeyProp = Key.getProperty();
1476  if (isa<VarDecl>(KeyProp))
1477  ObjectKind = Variable;
1478  else if (isa<ObjCPropertyDecl>(KeyProp))
1479  ObjectKind = Property;
1480  else if (isa<ObjCMethodDecl>(KeyProp))
1481  ObjectKind = ImplicitProperty;
1482  else if (isa<ObjCIvarDecl>(KeyProp))
1483  ObjectKind = Ivar;
1484  else
1485  llvm_unreachable("Unexpected weak object kind!");
1486 
1487  // Do not warn about IBOutlet weak property receivers being set to null
1488  // since they are typically only used from the main thread.
1489  if (const ObjCPropertyDecl *Prop = dyn_cast<ObjCPropertyDecl>(KeyProp))
1490  if (Prop->hasAttr<IBOutletAttr>())
1491  continue;
1492 
1493  // Show the first time the object was read.
1494  S.Diag(FirstRead->getBeginLoc(), DiagKind)
1495  << int(ObjectKind) << KeyProp << int(FunctionKind)
1496  << FirstRead->getSourceRange();
1497 
1498  // Print all the other accesses as notes.
1499  for (const auto &Use : Uses) {
1500  if (Use.getUseExpr() == FirstRead)
1501  continue;
1502  S.Diag(Use.getUseExpr()->getBeginLoc(),
1503  diag::note_arc_weak_also_accessed_here)
1504  << Use.getUseExpr()->getSourceRange();
1505  }
1506  }
1507 }
1508 
1509 namespace {
1510 class UninitValsDiagReporter : public UninitVariablesHandler {
1511  Sema &S;
1512  typedef SmallVector<UninitUse, 2> UsesVec;
1513  typedef llvm::PointerIntPair<UsesVec *, 1, bool> MappedType;
1514  // Prefer using MapVector to DenseMap, so that iteration order will be
1515  // the same as insertion order. This is needed to obtain a deterministic
1516  // order of diagnostics when calling flushDiagnostics().
1517  typedef llvm::MapVector<const VarDecl *, MappedType> UsesMap;
1518  UsesMap uses;
1519  UsesMap constRefUses;
1520 
1521 public:
1522  UninitValsDiagReporter(Sema &S) : S(S) {}
1523  ~UninitValsDiagReporter() override { flushDiagnostics(); }
1524 
1525  MappedType &getUses(UsesMap &um, const VarDecl *vd) {
1526  MappedType &V = um[vd];
1527  if (!V.getPointer())
1528  V.setPointer(new UsesVec());
1529  return V;
1530  }
1531 
1532  void handleUseOfUninitVariable(const VarDecl *vd,
1533  const UninitUse &use) override {
1534  getUses(uses, vd).getPointer()->push_back(use);
1535  }
1536 
1537  void handleConstRefUseOfUninitVariable(const VarDecl *vd,
1538  const UninitUse &use) override {
1539  getUses(constRefUses, vd).getPointer()->push_back(use);
1540  }
1541 
1542  void handleSelfInit(const VarDecl *vd) override {
1543  getUses(uses, vd).setInt(true);
1544  getUses(constRefUses, vd).setInt(true);
1545  }
1546 
1547  void flushDiagnostics() {
1548  for (const auto &P : uses) {
1549  const VarDecl *vd = P.first;
1550  const MappedType &V = P.second;
1551 
1552  UsesVec *vec = V.getPointer();
1553  bool hasSelfInit = V.getInt();
1554 
1555  // Specially handle the case where we have uses of an uninitialized
1556  // variable, but the root cause is an idiomatic self-init. We want
1557  // to report the diagnostic at the self-init since that is the root cause.
1558  if (!vec->empty() && hasSelfInit && hasAlwaysUninitializedUse(vec))
1561  /* isAlwaysUninit */ true),
1562  /* alwaysReportSelfInit */ true);
1563  else {
1564  // Sort the uses by their SourceLocations. While not strictly
1565  // guaranteed to produce them in line/column order, this will provide
1566  // a stable ordering.
1567  llvm::sort(vec->begin(), vec->end(),
1568  [](const UninitUse &a, const UninitUse &b) {
1569  // Prefer a more confident report over a less confident one.
1570  if (a.getKind() != b.getKind())
1571  return a.getKind() > b.getKind();
1572  return a.getUser()->getBeginLoc() < b.getUser()->getBeginLoc();
1573  });
1574 
1575  for (const auto &U : *vec) {
1576  // If we have self-init, downgrade all uses to 'may be uninitialized'.
1577  UninitUse Use = hasSelfInit ? UninitUse(U.getUser(), false) : U;
1578 
1579  if (DiagnoseUninitializedUse(S, vd, Use))
1580  // Skip further diagnostics for this variable. We try to warn only
1581  // on the first point at which a variable is used uninitialized.
1582  break;
1583  }
1584  }
1585 
1586  // Release the uses vector.
1587  delete vec;
1588  }
1589 
1590  uses.clear();
1591 
1592  // Flush all const reference uses diags.
1593  for (const auto &P : constRefUses) {
1594  const VarDecl *vd = P.first;
1595  const MappedType &V = P.second;
1596 
1597  UsesVec *vec = V.getPointer();
1598  bool hasSelfInit = V.getInt();
1599 
1600  if (!vec->empty() && hasSelfInit && hasAlwaysUninitializedUse(vec))
1603  /* isAlwaysUninit */ true),
1604  /* alwaysReportSelfInit */ true);
1605  else {
1606  for (const auto &U : *vec) {
1607  if (DiagnoseUninitializedConstRefUse(S, vd, U))
1608  break;
1609  }
1610  }
1611 
1612  // Release the uses vector.
1613  delete vec;
1614  }
1615 
1616  constRefUses.clear();
1617  }
1618 
1619 private:
1620  static bool hasAlwaysUninitializedUse(const UsesVec* vec) {
1621  return std::any_of(vec->begin(), vec->end(), [](const UninitUse &U) {
1622  return U.getKind() == UninitUse::Always ||
1623  U.getKind() == UninitUse::AfterCall ||
1624  U.getKind() == UninitUse::AfterDecl;
1625  });
1626  }
1627 };
1628 
1629 class CalledOnceCheckReporter : public CalledOnceCheckHandler {
1630 public:
1631  CalledOnceCheckReporter(Sema &S) : S(S) {}
1632  void handleDoubleCall(const ParmVarDecl *Parameter, const Expr *Call,
1633  const Expr *PrevCall, bool IsCompletionHandler,
1634  bool Poised) override {
1635  auto DiagToReport = IsCompletionHandler
1636  ? diag::warn_completion_handler_called_twice
1637  : diag::warn_called_once_gets_called_twice;
1638  S.Diag(Call->getBeginLoc(), DiagToReport) << Parameter;
1639  S.Diag(PrevCall->getBeginLoc(), diag::note_called_once_gets_called_twice)
1640  << Poised;
1641  }
1642 
1643  void handleNeverCalled(const ParmVarDecl *Parameter,
1644  bool IsCompletionHandler) override {
1645  auto DiagToReport = IsCompletionHandler
1646  ? diag::warn_completion_handler_never_called
1647  : diag::warn_called_once_never_called;
1648  S.Diag(Parameter->getBeginLoc(), DiagToReport)
1649  << Parameter << /* Captured */ false;
1650  }
1651 
1652  void handleNeverCalled(const ParmVarDecl *Parameter, const Stmt *Where,
1653  NeverCalledReason Reason, bool IsCalledDirectly,
1654  bool IsCompletionHandler) override {
1655  auto DiagToReport = IsCompletionHandler
1656  ? diag::warn_completion_handler_never_called_when
1657  : diag::warn_called_once_never_called_when;
1658  S.Diag(Where->getBeginLoc(), DiagToReport)
1659  << Parameter << IsCalledDirectly << (unsigned)Reason;
1660  }
1661 
1662  void handleCapturedNeverCalled(const ParmVarDecl *Parameter,
1663  const Decl *Where,
1664  bool IsCompletionHandler) override {
1665  auto DiagToReport = IsCompletionHandler
1666  ? diag::warn_completion_handler_never_called
1667  : diag::warn_called_once_never_called;
1668  S.Diag(Where->getBeginLoc(), DiagToReport)
1669  << Parameter << /* Captured */ true;
1670  }
1671 
1672 private:
1673  Sema &S;
1674 };
1675 
1676 constexpr unsigned CalledOnceWarnings[] = {
1677  diag::warn_called_once_never_called,
1678  diag::warn_called_once_never_called_when,
1679  diag::warn_called_once_gets_called_twice};
1680 
1681 constexpr unsigned CompletionHandlerWarnings[]{
1682  diag::warn_completion_handler_never_called,
1683  diag::warn_completion_handler_never_called_when,
1684  diag::warn_completion_handler_called_twice};
1685 
1686 bool shouldAnalyzeCalledOnceImpl(llvm::ArrayRef<unsigned> DiagIDs,
1687  const DiagnosticsEngine &Diags,
1688  SourceLocation At) {
1689  return llvm::any_of(DiagIDs, [&Diags, At](unsigned DiagID) {
1690  return !Diags.isIgnored(DiagID, At);
1691  });
1692 }
1693 
1694 bool shouldAnalyzeCalledOnceConventions(const DiagnosticsEngine &Diags,
1695  SourceLocation At) {
1696  return shouldAnalyzeCalledOnceImpl(CompletionHandlerWarnings, Diags, At);
1697 }
1698 
1699 bool shouldAnalyzeCalledOnceParameters(const DiagnosticsEngine &Diags,
1700  SourceLocation At) {
1701  return shouldAnalyzeCalledOnceImpl(CalledOnceWarnings, Diags, At) ||
1702  shouldAnalyzeCalledOnceConventions(Diags, At);
1703 }
1704 } // anonymous namespace
1705 
1706 namespace clang {
1707 namespace {
1709 typedef std::pair<PartialDiagnosticAt, OptionalNotes> DelayedDiag;
1710 typedef std::list<DelayedDiag> DiagList;
1711 
1712 struct SortDiagBySourceLocation {
1714  SortDiagBySourceLocation(SourceManager &SM) : SM(SM) {}
1715 
1716  bool operator()(const DelayedDiag &left, const DelayedDiag &right) {
1717  // Although this call will be slow, this is only called when outputting
1718  // multiple warnings.
1719  return SM.isBeforeInTranslationUnit(left.first.first, right.first.first);
1720  }
1721 };
1722 } // anonymous namespace
1723 } // namespace clang
1724 
1725 //===----------------------------------------------------------------------===//
1726 // -Wthread-safety
1727 //===----------------------------------------------------------------------===//
1728 namespace clang {
1729 namespace threadSafety {
1730 namespace {
1731 class ThreadSafetyReporter : public clang::threadSafety::ThreadSafetyHandler {
1732  Sema &S;
1733  DiagList Warnings;
1734  SourceLocation FunLocation, FunEndLocation;
1735 
1736  const FunctionDecl *CurrentFunction;
1737  bool Verbose;
1738 
1739  OptionalNotes getNotes() const {
1740  if (Verbose && CurrentFunction) {
1741  PartialDiagnosticAt FNote(CurrentFunction->getBody()->getBeginLoc(),
1742  S.PDiag(diag::note_thread_warning_in_fun)
1743  << CurrentFunction);
1744  return OptionalNotes(1, FNote);
1745  }
1746  return OptionalNotes();
1747  }
1748 
1749  OptionalNotes getNotes(const PartialDiagnosticAt &Note) const {
1750  OptionalNotes ONS(1, Note);
1751  if (Verbose && CurrentFunction) {
1752  PartialDiagnosticAt FNote(CurrentFunction->getBody()->getBeginLoc(),
1753  S.PDiag(diag::note_thread_warning_in_fun)
1754  << CurrentFunction);
1755  ONS.push_back(std::move(FNote));
1756  }
1757  return ONS;
1758  }
1759 
1760  OptionalNotes getNotes(const PartialDiagnosticAt &Note1,
1761  const PartialDiagnosticAt &Note2) const {
1762  OptionalNotes ONS;
1763  ONS.push_back(Note1);
1764  ONS.push_back(Note2);
1765  if (Verbose && CurrentFunction) {
1766  PartialDiagnosticAt FNote(CurrentFunction->getBody()->getBeginLoc(),
1767  S.PDiag(diag::note_thread_warning_in_fun)
1768  << CurrentFunction);
1769  ONS.push_back(std::move(FNote));
1770  }
1771  return ONS;
1772  }
1773 
1774  OptionalNotes makeLockedHereNote(SourceLocation LocLocked, StringRef Kind) {
1775  return LocLocked.isValid()
1776  ? getNotes(PartialDiagnosticAt(
1777  LocLocked, S.PDiag(diag::note_locked_here) << Kind))
1778  : getNotes();
1779  }
1780 
1781  OptionalNotes makeUnlockedHereNote(SourceLocation LocUnlocked,
1782  StringRef Kind) {
1783  return LocUnlocked.isValid()
1784  ? getNotes(PartialDiagnosticAt(
1785  LocUnlocked, S.PDiag(diag::note_unlocked_here) << Kind))
1786  : getNotes();
1787  }
1788 
1789  public:
1790  ThreadSafetyReporter(Sema &S, SourceLocation FL, SourceLocation FEL)
1791  : S(S), FunLocation(FL), FunEndLocation(FEL),
1792  CurrentFunction(nullptr), Verbose(false) {}
1793 
1794  void setVerbose(bool b) { Verbose = b; }
1795 
1796  /// Emit all buffered diagnostics in order of sourcelocation.
1797  /// We need to output diagnostics produced while iterating through
1798  /// the lockset in deterministic order, so this function orders diagnostics
1799  /// and outputs them.
1800  void emitDiagnostics() {
1801  Warnings.sort(SortDiagBySourceLocation(S.getSourceManager()));
1802  for (const auto &Diag : Warnings) {
1803  S.Diag(Diag.first.first, Diag.first.second);
1804  for (const auto &Note : Diag.second)
1805  S.Diag(Note.first, Note.second);
1806  }
1807  }
1808 
1809  void handleInvalidLockExp(StringRef Kind, SourceLocation Loc) override {
1810  PartialDiagnosticAt Warning(Loc, S.PDiag(diag::warn_cannot_resolve_lock)
1811  << Loc);
1812  Warnings.emplace_back(std::move(Warning), getNotes());
1813  }
1814 
1815  void handleUnmatchedUnlock(StringRef Kind, Name LockName, SourceLocation Loc,
1816  SourceLocation LocPreviousUnlock) override {
1817  if (Loc.isInvalid())
1818  Loc = FunLocation;
1819  PartialDiagnosticAt Warning(Loc, S.PDiag(diag::warn_unlock_but_no_lock)
1820  << Kind << LockName);
1821  Warnings.emplace_back(std::move(Warning),
1822  makeUnlockedHereNote(LocPreviousUnlock, Kind));
1823  }
1824 
1825  void handleIncorrectUnlockKind(StringRef Kind, Name LockName,
1826  LockKind Expected, LockKind Received,
1827  SourceLocation LocLocked,
1828  SourceLocation LocUnlock) override {
1829  if (LocUnlock.isInvalid())
1830  LocUnlock = FunLocation;
1832  LocUnlock, S.PDiag(diag::warn_unlock_kind_mismatch)
1833  << Kind << LockName << Received << Expected);
1834  Warnings.emplace_back(std::move(Warning),
1835  makeLockedHereNote(LocLocked, Kind));
1836  }
1837 
1838  void handleDoubleLock(StringRef Kind, Name LockName, SourceLocation LocLocked,
1839  SourceLocation LocDoubleLock) override {
1840  if (LocDoubleLock.isInvalid())
1841  LocDoubleLock = FunLocation;
1842  PartialDiagnosticAt Warning(LocDoubleLock, S.PDiag(diag::warn_double_lock)
1843  << Kind << LockName);
1844  Warnings.emplace_back(std::move(Warning),
1845  makeLockedHereNote(LocLocked, Kind));
1846  }
1847 
1848  void handleMutexHeldEndOfScope(StringRef Kind, Name LockName,
1849  SourceLocation LocLocked,
1850  SourceLocation LocEndOfScope,
1851  LockErrorKind LEK) override {
1852  unsigned DiagID = 0;
1853  switch (LEK) {
1855  DiagID = diag::warn_lock_some_predecessors;
1856  break;
1858  DiagID = diag::warn_expecting_lock_held_on_loop;
1859  break;
1861  DiagID = diag::warn_no_unlock;
1862  break;
1864  DiagID = diag::warn_expecting_locked;
1865  break;
1866  }
1867  if (LocEndOfScope.isInvalid())
1868  LocEndOfScope = FunEndLocation;
1869 
1870  PartialDiagnosticAt Warning(LocEndOfScope, S.PDiag(DiagID) << Kind
1871  << LockName);
1872  Warnings.emplace_back(std::move(Warning),
1873  makeLockedHereNote(LocLocked, Kind));
1874  }
1875 
1876  void handleExclusiveAndShared(StringRef Kind, Name LockName,
1877  SourceLocation Loc1,
1878  SourceLocation Loc2) override {
1880  S.PDiag(diag::warn_lock_exclusive_and_shared)
1881  << Kind << LockName);
1882  PartialDiagnosticAt Note(Loc2, S.PDiag(diag::note_lock_exclusive_and_shared)
1883  << Kind << LockName);
1884  Warnings.emplace_back(std::move(Warning), getNotes(Note));
1885  }
1886 
1887  void handleNoMutexHeld(StringRef Kind, const NamedDecl *D,
1889  SourceLocation Loc) override {
1890  assert((POK == POK_VarAccess || POK == POK_VarDereference) &&
1891  "Only works for variables");
1892  unsigned DiagID = POK == POK_VarAccess?
1893  diag::warn_variable_requires_any_lock:
1894  diag::warn_var_deref_requires_any_lock;
1895  PartialDiagnosticAt Warning(Loc, S.PDiag(DiagID)
1896  << D << getLockKindFromAccessKind(AK));
1897  Warnings.emplace_back(std::move(Warning), getNotes());
1898  }
1899 
1900  void handleMutexNotHeld(StringRef Kind, const NamedDecl *D,
1901  ProtectedOperationKind POK, Name LockName,
1902  LockKind LK, SourceLocation Loc,
1903  Name *PossibleMatch) override {
1904  unsigned DiagID = 0;
1905  if (PossibleMatch) {
1906  switch (POK) {
1907  case POK_VarAccess:
1908  DiagID = diag::warn_variable_requires_lock_precise;
1909  break;
1910  case POK_VarDereference:
1911  DiagID = diag::warn_var_deref_requires_lock_precise;
1912  break;
1913  case POK_FunctionCall:
1914  DiagID = diag::warn_fun_requires_lock_precise;
1915  break;
1916  case POK_PassByRef:
1917  DiagID = diag::warn_guarded_pass_by_reference;
1918  break;
1919  case POK_PtPassByRef:
1920  DiagID = diag::warn_pt_guarded_pass_by_reference;
1921  break;
1922  }
1923  PartialDiagnosticAt Warning(Loc, S.PDiag(DiagID) << Kind
1924  << D
1925  << LockName << LK);
1926  PartialDiagnosticAt Note(Loc, S.PDiag(diag::note_found_mutex_near_match)
1927  << *PossibleMatch);
1928  if (Verbose && POK == POK_VarAccess) {
1929  PartialDiagnosticAt VNote(D->getLocation(),
1930  S.PDiag(diag::note_guarded_by_declared_here)
1931  << D->getDeclName());
1932  Warnings.emplace_back(std::move(Warning), getNotes(Note, VNote));
1933  } else
1934  Warnings.emplace_back(std::move(Warning), getNotes(Note));
1935  } else {
1936  switch (POK) {
1937  case POK_VarAccess:
1938  DiagID = diag::warn_variable_requires_lock;
1939  break;
1940  case POK_VarDereference:
1941  DiagID = diag::warn_var_deref_requires_lock;
1942  break;
1943  case POK_FunctionCall:
1944  DiagID = diag::warn_fun_requires_lock;
1945  break;
1946  case POK_PassByRef:
1947  DiagID = diag::warn_guarded_pass_by_reference;
1948  break;
1949  case POK_PtPassByRef:
1950  DiagID = diag::warn_pt_guarded_pass_by_reference;
1951  break;
1952  }
1953  PartialDiagnosticAt Warning(Loc, S.PDiag(DiagID) << Kind
1954  << D
1955  << LockName << LK);
1956  if (Verbose && POK == POK_VarAccess) {
1958  S.PDiag(diag::note_guarded_by_declared_here));
1959  Warnings.emplace_back(std::move(Warning), getNotes(Note));
1960  } else
1961  Warnings.emplace_back(std::move(Warning), getNotes());
1962  }
1963  }
1964 
1965  void handleNegativeNotHeld(StringRef Kind, Name LockName, Name Neg,
1966  SourceLocation Loc) override {
1968  S.PDiag(diag::warn_acquire_requires_negative_cap)
1969  << Kind << LockName << Neg);
1970  Warnings.emplace_back(std::move(Warning), getNotes());
1971  }
1972 
1973  void handleNegativeNotHeld(const NamedDecl *D, Name LockName,
1974  SourceLocation Loc) override {
1976  Loc, S.PDiag(diag::warn_fun_requires_negative_cap) << D << LockName);
1977  Warnings.emplace_back(std::move(Warning), getNotes());
1978  }
1979 
1980  void handleFunExcludesLock(StringRef Kind, Name FunName, Name LockName,
1981  SourceLocation Loc) override {
1982  PartialDiagnosticAt Warning(Loc, S.PDiag(diag::warn_fun_excludes_mutex)
1983  << Kind << FunName << LockName);
1984  Warnings.emplace_back(std::move(Warning), getNotes());
1985  }
1986 
1987  void handleLockAcquiredBefore(StringRef Kind, Name L1Name, Name L2Name,
1988  SourceLocation Loc) override {
1990  S.PDiag(diag::warn_acquired_before) << Kind << L1Name << L2Name);
1991  Warnings.emplace_back(std::move(Warning), getNotes());
1992  }
1993 
1994  void handleBeforeAfterCycle(Name L1Name, SourceLocation Loc) override {
1996  S.PDiag(diag::warn_acquired_before_after_cycle) << L1Name);
1997  Warnings.emplace_back(std::move(Warning), getNotes());
1998  }
1999 
2000  void enterFunction(const FunctionDecl* FD) override {
2001  CurrentFunction = FD;
2002  }
2003 
2004  void leaveFunction(const FunctionDecl* FD) override {
2005  CurrentFunction = nullptr;
2006  }
2007 };
2008 } // anonymous namespace
2009 } // namespace threadSafety
2010 } // namespace clang
2011 
2012 //===----------------------------------------------------------------------===//
2013 // -Wconsumed
2014 //===----------------------------------------------------------------------===//
2015 
2016 namespace clang {
2017 namespace consumed {
2018 namespace {
2019 class ConsumedWarningsHandler : public ConsumedWarningsHandlerBase {
2020 
2021  Sema &S;
2022  DiagList Warnings;
2023 
2024 public:
2025 
2026  ConsumedWarningsHandler(Sema &S) : S(S) {}
2027 
2028  void emitDiagnostics() override {
2029  Warnings.sort(SortDiagBySourceLocation(S.getSourceManager()));
2030  for (const auto &Diag : Warnings) {
2031  S.Diag(Diag.first.first, Diag.first.second);
2032  for (const auto &Note : Diag.second)
2033  S.Diag(Note.first, Note.second);
2034  }
2035  }
2036 
2037  void warnLoopStateMismatch(SourceLocation Loc,
2038  StringRef VariableName) override {
2039  PartialDiagnosticAt Warning(Loc, S.PDiag(diag::warn_loop_state_mismatch) <<
2040  VariableName);
2041 
2042  Warnings.emplace_back(std::move(Warning), OptionalNotes());
2043  }
2044 
2045  void warnParamReturnTypestateMismatch(SourceLocation Loc,
2046  StringRef VariableName,
2047  StringRef ExpectedState,
2048  StringRef ObservedState) override {
2049 
2051  diag::warn_param_return_typestate_mismatch) << VariableName <<
2052  ExpectedState << ObservedState);
2053 
2054  Warnings.emplace_back(std::move(Warning), OptionalNotes());
2055  }
2056 
2057  void warnParamTypestateMismatch(SourceLocation Loc, StringRef ExpectedState,
2058  StringRef ObservedState) override {
2059 
2061  diag::warn_param_typestate_mismatch) << ExpectedState << ObservedState);
2062 
2063  Warnings.emplace_back(std::move(Warning), OptionalNotes());
2064  }
2065 
2066  void warnReturnTypestateForUnconsumableType(SourceLocation Loc,
2067  StringRef TypeName) override {
2069  diag::warn_return_typestate_for_unconsumable_type) << TypeName);
2070 
2071  Warnings.emplace_back(std::move(Warning), OptionalNotes());
2072  }
2073 
2074  void warnReturnTypestateMismatch(SourceLocation Loc, StringRef ExpectedState,
2075  StringRef ObservedState) override {
2076 
2078  diag::warn_return_typestate_mismatch) << ExpectedState << ObservedState);
2079 
2080  Warnings.emplace_back(std::move(Warning), OptionalNotes());
2081  }
2082 
2083  void warnUseOfTempInInvalidState(StringRef MethodName, StringRef State,
2084  SourceLocation Loc) override {
2085 
2087  diag::warn_use_of_temp_in_invalid_state) << MethodName << State);
2088 
2089  Warnings.emplace_back(std::move(Warning), OptionalNotes());
2090  }
2091 
2092  void warnUseInInvalidState(StringRef MethodName, StringRef VariableName,
2093  StringRef State, SourceLocation Loc) override {
2094 
2095  PartialDiagnosticAt Warning(Loc, S.PDiag(diag::warn_use_in_invalid_state) <<
2096  MethodName << VariableName << State);
2097 
2098  Warnings.emplace_back(std::move(Warning), OptionalNotes());
2099  }
2100 };
2101 } // anonymous namespace
2102 } // namespace consumed
2103 } // namespace clang
2104 
2105 //===----------------------------------------------------------------------===//
2106 // AnalysisBasedWarnings - Worker object used by Sema to execute analysis-based
2107 // warnings on a function, method, or block.
2108 //===----------------------------------------------------------------------===//
2109 
2111  enableCheckFallThrough = 1;
2112  enableCheckUnreachable = 0;
2113  enableThreadSafetyAnalysis = 0;
2114  enableConsumedAnalysis = 0;
2115 }
2116 
2117 static unsigned isEnabled(DiagnosticsEngine &D, unsigned diag) {
2118  return (unsigned)!D.isIgnored(diag, SourceLocation());
2119 }
2120 
2122  : S(s),
2123  NumFunctionsAnalyzed(0),
2124  NumFunctionsWithBadCFGs(0),
2125  NumCFGBlocks(0),
2126  MaxCFGBlocksPerFunction(0),
2127  NumUninitAnalysisFunctions(0),
2128  NumUninitAnalysisVariables(0),
2129  MaxUninitAnalysisVariablesPerFunction(0),
2130  NumUninitAnalysisBlockVisits(0),
2131  MaxUninitAnalysisBlockVisitsPerFunction(0) {
2132 
2133  using namespace diag;
2135 
2136  DefaultPolicy.enableCheckUnreachable =
2137  isEnabled(D, warn_unreachable) ||
2138  isEnabled(D, warn_unreachable_break) ||
2139  isEnabled(D, warn_unreachable_return) ||
2140  isEnabled(D, warn_unreachable_loop_increment);
2141 
2142  DefaultPolicy.enableThreadSafetyAnalysis =
2143  isEnabled(D, warn_double_lock);
2144 
2145  DefaultPolicy.enableConsumedAnalysis =
2146  isEnabled(D, warn_use_in_invalid_state);
2147 }
2148 
2149 static void flushDiagnostics(Sema &S, const sema::FunctionScopeInfo *fscope) {
2150  for (const auto &D : fscope->PossiblyUnreachableDiags)
2151  S.Diag(D.Loc, D.PD);
2152 }
2153 
2154 void clang::sema::
2156  sema::FunctionScopeInfo *fscope,
2157  const Decl *D, QualType BlockType) {
2158 
2159  // We avoid doing analysis-based warnings when there are errors for
2160  // two reasons:
2161  // (1) The CFGs often can't be constructed (if the body is invalid), so
2162  // don't bother trying.
2163  // (2) The code already has problems; running the analysis just takes more
2164  // time.
2165  DiagnosticsEngine &Diags = S.getDiagnostics();
2166 
2167  // Do not do any analysis if we are going to just ignore them.
2168  if (Diags.getIgnoreAllWarnings() ||
2169  (Diags.getSuppressSystemWarnings() &&
2171  return;
2172 
2173  // For code in dependent contexts, we'll do this at instantiation time.
2174  if (cast<DeclContext>(D)->isDependentContext())
2175  return;
2176 
2177  if (S.hasUncompilableErrorOccurred()) {
2178  // Flush out any possibly unreachable diagnostics.
2179  flushDiagnostics(S, fscope);
2180  return;
2181  }
2182 
2183  const Stmt *Body = D->getBody();
2184  assert(Body);
2185 
2186  // Construct the analysis context with the specified CFG build options.
2187  AnalysisDeclContext AC(/* AnalysisDeclContextManager */ nullptr, D);
2188 
2189  // Don't generate EH edges for CallExprs as we'd like to avoid the n^2
2190  // explosion for destructors that can result and the compile time hit.
2192  AC.getCFGBuildOptions().AddEHEdges = false;
2193  AC.getCFGBuildOptions().AddInitializers = true;
2198 
2199  // Force that certain expressions appear as CFGElements in the CFG. This
2200  // is used to speed up various analyses.
2201  // FIXME: This isn't the right factoring. This is here for initial
2202  // prototyping, but we need a way for analyses to say what expressions they
2203  // expect to always be CFGElements and then fill in the BuildOptions
2204  // appropriately. This is essentially a layering violation.
2205  if (P.enableCheckUnreachable || P.enableThreadSafetyAnalysis ||
2206  P.enableConsumedAnalysis) {
2207  // Unreachable code analysis and thread safety require a linearized CFG.
2209  }
2210  else {
2211  AC.getCFGBuildOptions()
2212  .setAlwaysAdd(Stmt::BinaryOperatorClass)
2213  .setAlwaysAdd(Stmt::CompoundAssignOperatorClass)
2214  .setAlwaysAdd(Stmt::BlockExprClass)
2215  .setAlwaysAdd(Stmt::CStyleCastExprClass)
2216  .setAlwaysAdd(Stmt::DeclRefExprClass)
2217  .setAlwaysAdd(Stmt::ImplicitCastExprClass)
2218  .setAlwaysAdd(Stmt::UnaryOperatorClass)
2219  .setAlwaysAdd(Stmt::AttributedStmtClass);
2220  }
2221 
2222  // Install the logical handler.
2224  if (LogicalErrorHandler::hasActiveDiagnostics(Diags, D->getBeginLoc())) {
2225  LEH.emplace(S);
2226  AC.getCFGBuildOptions().Observer = &*LEH;
2227  }
2228 
2229  // Emit delayed diagnostics.
2230  if (!fscope->PossiblyUnreachableDiags.empty()) {
2231  bool analyzed = false;
2232 
2233  // Register the expressions with the CFGBuilder.
2234  for (const auto &D : fscope->PossiblyUnreachableDiags) {
2235  for (const Stmt *S : D.Stmts)
2237  }
2238 
2239  if (AC.getCFG()) {
2240  analyzed = true;
2241  for (const auto &D : fscope->PossiblyUnreachableDiags) {
2242  bool AllReachable = true;
2243  for (const Stmt *S : D.Stmts) {
2244  const CFGBlock *block = AC.getBlockForRegisteredExpression(S);
2247  // FIXME: We should be able to assert that block is non-null, but
2248  // the CFG analysis can skip potentially-evaluated expressions in
2249  // edge cases; see test/Sema/vla-2.c.
2250  if (block && cra) {
2251  // Can this block be reached from the entrance?
2252  if (!cra->isReachable(&AC.getCFG()->getEntry(), block)) {
2253  AllReachable = false;
2254  break;
2255  }
2256  }
2257  // If we cannot map to a basic block, assume the statement is
2258  // reachable.
2259  }
2260 
2261  if (AllReachable)
2262  S.Diag(D.Loc, D.PD);
2263  }
2264  }
2265 
2266  if (!analyzed)
2267  flushDiagnostics(S, fscope);
2268  }
2269 
2270  // Warning: check missing 'return'
2271  if (P.enableCheckFallThrough) {
2272  const CheckFallThroughDiagnostics &CD =
2273  (isa<BlockDecl>(D)
2274  ? CheckFallThroughDiagnostics::MakeForBlock()
2275  : (isa<CXXMethodDecl>(D) &&
2276  cast<CXXMethodDecl>(D)->getOverloadedOperator() == OO_Call &&
2277  cast<CXXMethodDecl>(D)->getParent()->isLambda())
2278  ? CheckFallThroughDiagnostics::MakeForLambda()
2279  : (fscope->isCoroutine()
2280  ? CheckFallThroughDiagnostics::MakeForCoroutine(D)
2281  : CheckFallThroughDiagnostics::MakeForFunction(D)));
2282  CheckFallThroughForBody(S, D, Body, BlockType, CD, AC, fscope);
2283  }
2284 
2285  // Warning: check for unreachable code
2286  if (P.enableCheckUnreachable) {
2287  // Only check for unreachable code on non-template instantiations.
2288  // Different template instantiations can effectively change the control-flow
2289  // and it is very difficult to prove that a snippet of code in a template
2290  // is unreachable for all instantiations.
2291  bool isTemplateInstantiation = false;
2292  if (const FunctionDecl *Function = dyn_cast<FunctionDecl>(D))
2293  isTemplateInstantiation = Function->isTemplateInstantiation();
2295  CheckUnreachable(S, AC);
2296  }
2297 
2298  // Check for thread safety violations
2299  if (P.enableThreadSafetyAnalysis) {
2300  SourceLocation FL = AC.getDecl()->getLocation();
2301  SourceLocation FEL = AC.getDecl()->getEndLoc();
2302  threadSafety::ThreadSafetyReporter Reporter(S, FL, FEL);
2303  if (!Diags.isIgnored(diag::warn_thread_safety_beta, D->getBeginLoc()))
2304  Reporter.setIssueBetaWarnings(true);
2305  if (!Diags.isIgnored(diag::warn_thread_safety_verbose, D->getBeginLoc()))
2306  Reporter.setVerbose(true);
2307 
2310  Reporter.emitDiagnostics();
2311  }
2312 
2313  // Check for violations of consumed properties.
2314  if (P.enableConsumedAnalysis) {
2315  consumed::ConsumedWarningsHandler WarningHandler(S);
2316  consumed::ConsumedAnalyzer Analyzer(WarningHandler);
2317  Analyzer.run(AC);
2318  }
2319 
2320  if (!Diags.isIgnored(diag::warn_uninit_var, D->getBeginLoc()) ||
2321  !Diags.isIgnored(diag::warn_sometimes_uninit_var, D->getBeginLoc()) ||
2322  !Diags.isIgnored(diag::warn_maybe_uninit_var, D->getBeginLoc()) ||
2323  !Diags.isIgnored(diag::warn_uninit_const_reference, D->getBeginLoc())) {
2324  if (CFG *cfg = AC.getCFG()) {
2325  UninitValsDiagReporter reporter(S);
2327  std::memset(&stats, 0, sizeof(UninitVariablesAnalysisStats));
2328  runUninitializedVariablesAnalysis(*cast<DeclContext>(D), *cfg, AC,
2329  reporter, stats);
2330 
2331  if (S.CollectStats && stats.NumVariablesAnalyzed > 0) {
2332  ++NumUninitAnalysisFunctions;
2333  NumUninitAnalysisVariables += stats.NumVariablesAnalyzed;
2334  NumUninitAnalysisBlockVisits += stats.NumBlockVisits;
2335  MaxUninitAnalysisVariablesPerFunction =
2336  std::max(MaxUninitAnalysisVariablesPerFunction,
2337  stats.NumVariablesAnalyzed);
2338  MaxUninitAnalysisBlockVisitsPerFunction =
2339  std::max(MaxUninitAnalysisBlockVisitsPerFunction,
2340  stats.NumBlockVisits);
2341  }
2342  }
2343  }
2344 
2345  // Check for violations of "called once" parameter properties.
2346  if (S.getLangOpts().ObjC &&
2347  shouldAnalyzeCalledOnceParameters(Diags, D->getBeginLoc())) {
2348  if (AC.getCFG()) {
2349  CalledOnceCheckReporter Reporter(S);
2351  AC, Reporter,
2352  shouldAnalyzeCalledOnceConventions(Diags, D->getBeginLoc()));
2353  }
2354  }
2355 
2356  bool FallThroughDiagFull =
2357  !Diags.isIgnored(diag::warn_unannotated_fallthrough, D->getBeginLoc());
2358  bool FallThroughDiagPerFunction = !Diags.isIgnored(
2359  diag::warn_unannotated_fallthrough_per_function, D->getBeginLoc());
2360  if (FallThroughDiagFull || FallThroughDiagPerFunction ||
2361  fscope->HasFallthroughStmt) {
2362  DiagnoseSwitchLabelsFallthrough(S, AC, !FallThroughDiagFull);
2363  }
2364 
2365  if (S.getLangOpts().ObjCWeak &&
2366  !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, D->getBeginLoc()))
2367  diagnoseRepeatedUseOfWeak(S, fscope, D, AC.getParentMap());
2368 
2369 
2370  // Check for infinite self-recursion in functions
2371  if (!Diags.isIgnored(diag::warn_infinite_recursive_function,
2372  D->getBeginLoc())) {
2373  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
2374  checkRecursiveFunction(S, FD, Body, AC);
2375  }
2376  }
2377 
2378  // Check for throw out of non-throwing function.
2379  if (!Diags.isIgnored(diag::warn_throw_in_noexcept_func, D->getBeginLoc()))
2380  if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
2381  if (S.getLangOpts().CPlusPlus && isNoexcept(FD))
2382  checkThrowInNonThrowingFunc(S, FD, AC);
2383 
2384  // If none of the previous checks caused a CFG build, trigger one here
2385  // for the logical error handler.
2386  if (LogicalErrorHandler::hasActiveDiagnostics(Diags, D->getBeginLoc())) {
2387  AC.getCFG();
2388  }
2389 
2390  // Collect statistics about the CFG if it was built.
2391  if (S.CollectStats && AC.isCFGBuilt()) {
2392  ++NumFunctionsAnalyzed;
2393  if (CFG *cfg = AC.getCFG()) {
2394  // If we successfully built a CFG for this context, record some more
2395  // detail information about it.
2396  NumCFGBlocks += cfg->getNumBlockIDs();
2397  MaxCFGBlocksPerFunction = std::max(MaxCFGBlocksPerFunction,
2398  cfg->getNumBlockIDs());
2399  } else {
2400  ++NumFunctionsWithBadCFGs;
2401  }
2402  }
2403 }
2404 
2406  llvm::errs() << "\n*** Analysis Based Warnings Stats:\n";
2407 
2408  unsigned NumCFGsBuilt = NumFunctionsAnalyzed - NumFunctionsWithBadCFGs;
2409  unsigned AvgCFGBlocksPerFunction =
2410  !NumCFGsBuilt ? 0 : NumCFGBlocks/NumCFGsBuilt;
2411  llvm::errs() << NumFunctionsAnalyzed << " functions analyzed ("
2412  << NumFunctionsWithBadCFGs << " w/o CFGs).\n"
2413  << " " << NumCFGBlocks << " CFG blocks built.\n"
2414  << " " << AvgCFGBlocksPerFunction
2415  << " average CFG blocks per function.\n"
2416  << " " << MaxCFGBlocksPerFunction
2417  << " max CFG blocks per function.\n";
2418 
2419  unsigned AvgUninitVariablesPerFunction = !NumUninitAnalysisFunctions ? 0
2420  : NumUninitAnalysisVariables/NumUninitAnalysisFunctions;
2421  unsigned AvgUninitBlockVisitsPerFunction = !NumUninitAnalysisFunctions ? 0
2422  : NumUninitAnalysisBlockVisits/NumUninitAnalysisFunctions;
2423  llvm::errs() << NumUninitAnalysisFunctions
2424  << " functions analyzed for uninitialiazed variables\n"
2425  << " " << NumUninitAnalysisVariables << " variables analyzed.\n"
2426  << " " << AvgUninitVariablesPerFunction
2427  << " average variables per function.\n"
2428  << " " << MaxUninitAnalysisVariablesPerFunction
2429  << " max variables per function.\n"
2430  << " " << NumUninitAnalysisBlockVisits << " block visits.\n"
2431  << " " << AvgUninitBlockVisitsPerFunction
2432  << " average block visits per function.\n"
2433  << " " << MaxUninitAnalysisBlockVisitsPerFunction
2434  << " max block visits per function.\n";
2435 }
clang::threadSafety::LEK_LockedAtEndOfFunction
@ LEK_LockedAtEndOfFunction
Definition: ThreadSafety.h:88
clang::ConditionalOperator::getFalseExpr
Expr * getFalseExpr() const
Definition: Expr.h:4097
clang::LabelStmt
LabelStmt - Represents a label, which has a substatement.
Definition: Stmt.h:1798
clang::UninitVariablesAnalysisStats::NumBlockVisits
unsigned NumBlockVisits
Definition: UninitializedValues.h:125
CFGReachabilityAnalysis.h
clang::BinaryOperator::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:3781
clang::sema::FunctionScopeInfo::PossiblyUnreachableDiags
SmallVector< PossiblyUnreachableDiag, 4 > PossiblyUnreachableDiags
A list of PartialDiagnostics created but delayed within the current function scope.
Definition: ScopeInfo.h:221
clang::TokenValue
Stores token information for comparing actual tokens with predefined values.
Definition: Preprocessor.h:90
max
__DEVICE__ int max(int __a, int __b)
Definition: __clang_cuda_math.h:194
clang::CFGReverseBlockReachabilityAnalysis::isReachable
bool isReachable(const CFGBlock *Src, const CFGBlock *Dst)
Returns true if the block 'Dst' can be reached from block 'Src'.
Definition: CFGReachabilityAnalysis.cpp:26
clang::ConditionalOperator::getTrueExpr
Expr * getTrueExpr() const
Definition: Expr.h:4092
clang::sema::FunctionScopeInfo::getWeakObjectUses
const WeakObjectUseMap & getWeakObjectUses() const
Definition: ScopeInfo.h:410
clang::VarDecl::getSourceRange
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:2032
clang::Decl::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: DeclBase.h:422
clang::Type::isBlockPointerType
bool isBlockPointerType() const
Definition: Type.h:6676
clang::reachable_code::FindUnreachableCode
void FindUnreachableCode(AnalysisDeclContext &AC, Preprocessor &PP, Callback &CB)
Definition: ReachableCode.cpp:679
clang::TypeSourceInfo::getType
QualType getType() const
Return the type wrapped by this type source info.
Definition: Type.h:6402
clang::CXXMemberCallExpr::getMethodDecl
CXXMethodDecl * getMethodDecl() const
Retrieve the declaration of the called method.
Definition: ExprCXX.cpp:668
clang::CalledOnceCheckHandler
Definition: CalledOnceCheck.h:47
clang::threadSafety::POK_FunctionCall
@ POK_FunctionCall
Making a function call (e.g. fool())
Definition: ThreadSafety.h:44
clang::CharSourceRange::getBegin
SourceLocation getBegin() const
Definition: SourceLocation.h:285
clang::SwitchStmt
SwitchStmt - This represents a 'switch' stmt.
Definition: Stmt.h:2117
clang::DeclaratorDecl::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Decl.h:738
clang::Decl::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: DeclBase.h:426
clang::FunctionDecl::TK_MemberSpecialization
@ TK_MemberSpecialization
Definition: Decl.h:1825
clang::SourceRange
A trivial tuple used to represent a source range.
Definition: SourceLocation.h:212
clang::CFGBlock::empty
bool empty() const
Definition: CFG.h:918
clang::DeclContext
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1302
clang::ObjCSubstitutionContext::Parameter
@ Parameter
The parameter type of a method or function.
clang::Decl::hasAttr
bool hasAttr() const
Definition: DeclBase.h:547
clang::Preprocessor::getLastMacroWithSpelling
StringRef getLastMacroWithSpelling(SourceLocation Loc, ArrayRef< TokenValue > Tokens) const
Return the name of the macro defined before Loc that has spelling Tokens.
Definition: Preprocessor.cpp:351
clang::sema::AnalysisBasedWarnings::Policy::Policy
Policy()
Definition: AnalysisBasedWarnings.cpp:2110
clang::FixItHint::CreateInsertion
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:96
clang::threadSafety::AccessKind
AccessKind
This enum distinguishes between different ways to access (read or write) a variable.
Definition: ThreadSafety.h:69
clang::Sema::getASTContext
ASTContext & getASTContext() const
Definition: Sema.h:1528
clang::Decl::getAsFunction
FunctionDecl * getAsFunction() LLVM_READONLY
Returns the function itself, or the templated function if this is a function template.
Definition: DeclBase.cpp:218
clang::Sema::SourceMgr
SourceManager & SourceMgr
Definition: Sema.h:405
clang::BlockExpr::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Expr.h:5910
clang::sema::AnalysisBasedWarnings::PrintStats
void PrintStats() const
Definition: AnalysisBasedWarnings.cpp:2405
Diag
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
Definition: LiteralSupport.cpp:78
clang::Sema::ThreadSafetyDeclCache
threadSafety::BeforeSet * ThreadSafetyDeclCache
Definition: Sema.h:9070
clang::CFGBlock::succ_size
unsigned succ_size() const
Definition: CFG.h:973
clang::SourceManager::isInMainFile
bool isInMainFile(SourceLocation Loc) const
Returns whether the PresumedLoc for a given SourceLocation is in the main file.
Definition: SourceManager.cpp:1545
SemaInternal.h
clang::CFG::getNumBlockIDs
unsigned getNumBlockIDs() const
Returns the total number of BlockIDs allocated (which start at 0).
Definition: CFG.h:1407
clang::CFGBlock::succ_begin
succ_iterator succ_begin()
Definition: CFG.h:955
DiagnoseUninitializedUse
static bool DiagnoseUninitializedUse(Sema &S, const VarDecl *VD, const UninitUse &Use, bool alwaysReportSelfInit=false)
DiagnoseUninitializedUse – Helper function for diagnosing uses of an uninitialized variable.
Definition: AnalysisBasedWarnings.cpp:992
AnalysisDeclContext.h
llvm::SmallVector
Definition: LLVM.h:35
clang::CFG::BuildOptions::AddEHEdges
bool AddEHEdges
Definition: CFG.h:1240
clang::Sema::getFixItZeroInitializerForType
std::string getFixItZeroInitializerForType(QualType T, SourceLocation Loc) const
Get a string to suggest for zero-initialization of a type.
Definition: SemaFixItUtils.cpp:200
clang::SourceLocation
Encodes a location in the source.
Definition: SourceLocation.h:89
clang::QualType::getQualifiers
Qualifiers getQualifiers() const
Retrieve the set of qualifiers applied to this type.
Definition: Type.h:6447
clang::DiagnosticsEngine::isIgnored
bool isIgnored(unsigned DiagID, SourceLocation Loc) const
Determine whether the diagnostic is known to be ignored.
Definition: Diagnostic.h:906
clang::NamedDecl
This represents a decl that may have a name.
Definition: Decl.h:223
clang::SourceRange::getBegin
SourceLocation getBegin() const
Definition: SourceLocation.h:221
clang::checkCalledOnceParameters
void checkCalledOnceParameters(AnalysisDeclContext &AC, CalledOnceCheckHandler &Handler, bool CheckConventionalParameters)
Check given CFG for 'called once' parameter violations.
Definition: CalledOnceCheck.cpp:1544
EvaluatedExprVisitor.h
clang::CFGBlock::getBlockID
unsigned getBlockID() const
Definition: CFG.h:1074
clang::CFG::BuildOptions::setAllAlwaysAdd
BuildOptions & setAllAlwaysAdd()
Definition: CFG.h:1267
clang::reachable_code::UK_Loop_Increment
@ UK_Loop_Increment
Definition: ReachableCode.h:43
clang::Stmt::getSourceRange
SourceRange getSourceRange() const LLVM_READONLY
SourceLocation tokens are not useful in isolation - they are low level value objects created/interpre...
Definition: Stmt.cpp:324
clang::FunctionDecl::getExceptionSpecSourceRange
SourceRange getExceptionSpecSourceRange() const
Attempt to compute an informative source range covering the function exception specification,...
Definition: Decl.cpp:3518
clang::FunctionDecl::getCanonicalDecl
FunctionDecl * getCanonicalDecl() override
Retrieves the "canonical" declaration of the given declaration.
Definition: Decl.cpp:3246
clang::QualType
A (possibly-)qualified type.
Definition: Type.h:661
clang::NestedNameSpecifier
Represents a C++ nested name specifier, such as "\::std::vector<int>::".
Definition: NestedNameSpecifier.h:50
clang::DynamicInitKind::Initializer
@ Initializer
clang::AnalysisDeclContext
AnalysisDeclContext contains the context data for the function, method or block under analysis.
Definition: AnalysisDeclContext.h:72
clang::CFGBlock::pred_empty
bool pred_empty() const
Definition: CFG.h:977
clang::QualType::getCanonicalType
QualType getCanonicalType() const
Definition: Type.h:6459
clang::DiagnosticsEngine
Concrete class used by the front-end to report problems and issues.
Definition: Diagnostic.h:191
clang::threadSafety::LEK_NotLockedAtEndOfFunction
@ LEK_NotLockedAtEndOfFunction
Definition: ThreadSafety.h:89
clang::ParmVarDecl
Represents a parameter to a function.
Definition: Decl.h:1620
clang::Sema::Diag
SemaDiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID, bool DeferHint=false)
Emit a diagnostic.
Definition: Sema.cpp:1767
DeclCXX.h
int
__device__ int
Definition: __clang_hip_libdevice_declares.h:63
clang::BinaryOperator::getExprLoc
SourceLocation getExprLoc() const
Definition: Expr.h:3767
clang::IfStmt
IfStmt - This represents an if/then/else.
Definition: Stmt.h:1900
clang::SourceRange::isValid
bool isValid() const
Definition: SourceLocation.h:227
clang::Sema::getSourceManager
SourceManager & getSourceManager() const
Definition: Sema.h:1526
clang::consumed::ConsumedAnalyzer::run
void run(AnalysisDeclContext &AC)
Check a function's CFG for consumed violations.
Definition: Consumed.cpp:1304
llvm::Optional
Definition: LLVM.h:37
checkForRecursiveFunctionCall
static bool checkForRecursiveFunctionCall(const FunctionDecl *FD, CFG *cfg)
Definition: AnalysisBasedWarnings.cpp:219
clang::LabelStmt::getSubStmt
Stmt * getSubStmt()
Definition: Stmt.h:1819
llvm::SmallPtrSet
Definition: ASTContext.h:81
SourceManager.h
clang::serialized_diags::Note
@ Note
Definition: SerializedDiagnostics.h:45
llvm::Expected
Definition: LLVM.h:38
clang::CallExpr::getCalleeDecl
Decl * getCalleeDecl()
Definition: Expr.h:2894
clang::index::SymbolRole::Call
@ Call
clang::BinaryOperator::getOpcode
Opcode getOpcode() const
Definition: Expr.h:3771
clang::threadSafety::POK_VarAccess
@ POK_VarAccess
Reading or writing a variable (e.g. x in x = 5;)
Definition: ThreadSafety.h:41
emitDiagnostics
static void emitDiagnostics(BoundNodes &Match, const Decl *D, BugReporter &BR, AnalysisManager &AM, const ObjCAutoreleaseWriteChecker *Checker)
Definition: ObjCAutoreleaseWriteChecker.cpp:109
clang::FunctionType
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3541
clang::sema::AnalysisBasedWarnings::AnalysisBasedWarnings
AnalysisBasedWarnings(Sema &s)
Definition: AnalysisBasedWarnings.cpp:2121
clang::CFGBlock::const_succ_iterator
AdjacentBlocks::const_iterator const_succ_iterator
Definition: CFG.h:931
UnknownFallThrough
@ UnknownFallThrough
Definition: AnalysisBasedWarnings.cpp:383
clang::CFG
Represents a source-level, intra-procedural CFG that represents the control-flow of a Stmt.
Definition: CFG.h:1225
clang::reachable_code::UnreachableKind
UnreachableKind
Classifications of unreachable code.
Definition: ReachableCode.h:40
clang::Sema::CollectStats
bool CollectStats
Flag indicating whether or not to collect detailed statistics.
Definition: Sema.h:408
b
__device__ __2f16 b
Definition: __clang_hip_libdevice_declares.h:302
clang::threadSafety::ProtectedOperationKind
ProtectedOperationKind
This enum distinguishes between different kinds of operations that may need to be protected by locks.
Definition: ThreadSafety.h:36
clang::UninitUse::getUser
const Expr * getUser() const
Get the expression containing the uninitialized use.
Definition: UninitializedValues.h:66
CheckFallThrough
static ControlFlowKind CheckFallThrough(AnalysisDeclContext &AC)
CheckFallThrough - Check that we don't fall off the end of a Statement that should return a value.
Definition: AnalysisBasedWarnings.cpp:399
SuggestInitializationFixit
static bool SuggestInitializationFixit(Sema &S, const VarDecl *VD)
Definition: AnalysisBasedWarnings.cpp:756
clang::SourceManager
This class handles loading and caching of source files into memory.
Definition: SourceManager.h:624
DiagnoseSwitchLabelsFallthrough
static void DiagnoseSwitchLabelsFallthrough(Sema &S, AnalysisDeclContext &AC, bool PerFunction)
Definition: AnalysisBasedWarnings.cpp:1262
clang::Preprocessor::getLangOpts
const LangOptions & getLangOpts() const
Definition: Preprocessor.h:922
clang::Sema::Context
ASTContext & Context
Definition: Sema.h:402
clang::CFG::BuildOptions::PruneTriviallyFalseEdges
bool PruneTriviallyFalseEdges
Definition: CFG.h:1239
Preprocessor.h
clang::ConditionalOperator
ConditionalOperator - The ?: ternary operator.
Definition: Expr.h:4065
clang::CXXThrowExpr
A C++ throw-expression (C++ [except.throw]).
Definition: ExprCXX.h:1181
DeclObjC.h
clang::AnalysisDeclContext::registerForcedBlockExpression
void registerForcedBlockExpression(const Stmt *stmt)
Definition: AnalysisDeclContext.cpp:180
clang::FixItHint
Annotates a diagnostic with some code that should be inserted, removed, or replaced to fix the proble...
Definition: Diagnostic.h:70
clang::Sema::getLangOpts
const LangOptions & getLangOpts() const
Definition: Sema.h:1521
clang::CFGBlock
Represents a single basic block in a source-level CFG.
Definition: CFG.h:576
clang::threadSafety::LEK_LockedSomeLoopIterations
@ LEK_LockedSomeLoopIterations
Definition: ThreadSafety.h:86
U
clang::AnalysisDeclContext::getAddEHEdges
bool getAddEHEdges() const
Definition: AnalysisDeclContext.h:119
clang::CXXMemberCallExpr::getImplicitObjectArgument
Expr * getImplicitObjectArgument() const
Retrieve the implicit object argument for the member call.
Definition: ExprCXX.cpp:649
clang::CharSourceRange::getCharRange
static CharSourceRange getCharRange(SourceRange R)
Definition: SourceLocation.h:267
clang::Decl::getLexicalDeclContext
DeclContext * getLexicalDeclContext()
getLexicalDeclContext - The declaration context where this Decl was lexically declared (LexicalDC).
Definition: DeclBase.h:843
clang::AttributedStmt
Represents an attribute applied to a statement.
Definition: Stmt.h:1842
clang::consumed::DelayedDiag
std::pair< PartialDiagnosticAt, OptionalNotes > DelayedDiag
Definition: Consumed.h:53
clang::CFGBlock::succs
succ_range succs()
Definition: CFG.h:965
clang::CallExpr::getCallee
Expr * getCallee()
Definition: Expr.h:2880
clang::threadSafety::POK_PtPassByRef
@ POK_PtPassByRef
Passing a pt-guarded variable by reference.
Definition: ThreadSafety.h:50
V
#define V(N, I)
Definition: ASTContext.h:2997
AlwaysFallThrough
@ AlwaysFallThrough
Definition: AnalysisBasedWarnings.cpp:386
clang::FunctionDecl::isCPUDispatchMultiVersion
bool isCPUDispatchMultiVersion() const
True if this function is a multiversioned dispatch function as a part of the cpu_specific/cpu_dispatc...
Definition: Decl.cpp:3219
clang::DeclarationName::getCXXOverloadedOperator
OverloadedOperatorKind getCXXOverloadedOperator() const
If this name is the name of an overloadable operator in C++ (e.g., operator+), retrieve the kind of o...
Definition: DeclarationName.h:462
clang::AnalysisDeclContext::getParentMap
ParentMap & getParentMap()
Definition: AnalysisDeclContext.cpp:279
clang::CXXThrowExpr::getThrowLoc
SourceLocation getThrowLoc() const
Definition: ExprCXX.h:1204
clang::PartialDiagnosticAt
std::pair< SourceLocation, PartialDiagnostic > PartialDiagnosticAt
A partial diagnostic along with the source location where this diagnostic occurs.
Definition: PartialDiagnostic.h:208
clang::Sema::getDiagnostics
DiagnosticsEngine & getDiagnostics() const
Definition: Sema.h:1525
CreateIfFixit
static void CreateIfFixit(Sema &S, const Stmt *If, const Stmt *Then, const Stmt *Else, bool CondVal, FixItHint &Fixit1, FixItHint &Fixit2)
Create a fixit to remove an if-like statement, on the assumption that its condition is CondVal.
Definition: AnalysisBasedWarnings.cpp:788
clang::BinaryOperator
A builtin binary operation expression such as "x + y" or "x <= y".
Definition: Expr.h:3727
clang::FunctionDecl::getTemplatedKind
TemplatedKind getTemplatedKind() const
What kind of templated function this is.
Definition: Decl.cpp:3606
clang::Sema::hasUncompilableErrorOccurred
bool hasUncompilableErrorOccurred() const
Whether uncompilable error has occurred.
Definition: Sema.cpp:1477
clang::LambdaExpr
A C++ lambda expression, which produces a function object (of unspecified type) that can be invoked l...
Definition: ExprCXX.h:1865
clang::threadSafety::LockErrorKind
LockErrorKind
Definition: ThreadSafety.h:85
clang::interp::LE
bool LE(InterpState &S, CodePtr OpPC)
Definition: Interp.h:237
clang::SourceRange::getEnd
SourceLocation getEnd() const
Definition: SourceLocation.h:222
clang::CFGReverseBlockReachabilityAnalysis
Definition: CFGReachabilityAnalysis.h:31
clang::ASTContext
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:187
clang::threadSafety::ThreadSafetyHandler
Handler class for thread safety warnings.
Definition: ThreadSafety.h:93
clang::sema::FunctionScopeInfo::CoroutinePromise
VarDecl * CoroutinePromise
The promise object for this coroutine, if any.
Definition: ScopeInfo.h:199
UninitializedValues.h
clang::RecursiveASTVisitor
A class that does preorder or postorder depth-first traversal on the entire Clang AST and visits each...
Definition: RecursiveASTVisitor.h:164
clang::FunctionDecl::getBody
Stmt * getBody(const FunctionDecl *&Definition) const
Retrieve the body (definition) of the function.
Definition: Decl.cpp:2978
clang::Type::getAs
const T * getAs() const
Member-template getAs<specific type>'.
Definition: Type.h:7153
clang::CFGBlock::FilterOptions
Definition: CFG.h:980
ReachableCode.h
clang::serialized_diags::Warning
@ Warning
Definition: SerializedDiagnostics.h:46
clang::UninitVariablesHandler
Definition: UninitializedValues.h:104
clang::Decl::getCanonicalDecl
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:901
clang::AnalysisDeclContext::getCFGReachablityAnalysis
CFGReverseBlockReachabilityAnalysis * getCFGReachablityAnalysis()
Definition: AnalysisDeclContext.cpp:263
clang::Stmt::children
child_range children()
Definition: Stmt.cpp:285
clang::CFGBlock::rend
reverse_iterator rend()
Definition: CFG.h:881
clang::Sema::PDiag
PartialDiagnostic PDiag(unsigned DiagID=0)
Build a partial diagnostic.
Definition: SemaInternal.h:24
clang::Stmt::getEndLoc
SourceLocation getEndLoc() const LLVM_READONLY
Definition: Stmt.cpp:348
clang::Qualifiers::hasObjCLifetime
bool hasObjCLifetime() const
Definition: Type.h:334
llvm::SmallString
Definition: LLVM.h:34
clang::Expr::EvalResult
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:608
clang::VarDecl
Represents a variable declaration or definition.
Definition: Decl.h:834
AnalysisBasedWarnings.h
clang::Type::getPointeeType
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee.
Definition: Type.cpp:625
clang::consumed::ConsumedAnalyzer
A class that handles the analysis of uniqueness violations.
Definition: Consumed.h:240
CheckUnreachable
static void CheckUnreachable(Sema &S, AnalysisDeclContext &AC)
CheckUnreachable - Check for unreachable code.
Definition: AnalysisBasedWarnings.cpp:110
clang::UninitUse::Always
@ Always
The use is always uninitialized.
Definition: UninitializedValues.h:85
clang::consumed::OptionalNotes
SmallVector< PartialDiagnosticAt, 1 > OptionalNotes
Definition: Consumed.h:52
clang::Sema::getLocForEndOfToken
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset=0)
Calls Lexer::getLocForEndOfToken()
Definition: Sema.cpp:52
clang::IfStmt::getElse
Stmt * getElse()
Definition: Stmt.h:2000
clang::SwitchCase
Definition: Stmt.h:1521
ExprObjC.h
clang::UninitUse::Maybe
@ Maybe
The use might be uninitialized.
Definition: UninitializedValues.h:71
ExprCXX.h
Base
clang::CFGCallback
CFGCallback defines methods that should be called when a logical operator error is found when buildin...
Definition: CFG.h:1207
Label
std::string Label
Definition: UsingDeclarationsSorter.cpp:69
clang::CFGBlock::rbegin
reverse_iterator rbegin()
Definition: CFG.h:880
clang::BinaryOperator::getOpcodeStr
static StringRef getOpcodeStr(Opcode Op)
getOpcodeStr - Turn an Opcode enum value into the punctuation char it corresponds to,...
Definition: Expr.cpp:1916
ThreadSafety.h
clang::CFG::getExit
CFGBlock & getExit()
Definition: CFG.h:1333
clang::UninitVariablesAnalysisStats
Definition: UninitializedValues.h:123
CheckFallThroughForBody
static void CheckFallThroughForBody(Sema &S, const Decl *D, const Stmt *Body, QualType BlockType, const CheckFallThroughDiagnostics &CD, AnalysisDeclContext &AC, sema::FunctionScopeInfo *FSI)
CheckFallThroughForBody - Check that we don't fall off the end of a function that should return a val...
Definition: AnalysisBasedWarnings.cpp:638
StmtObjC.h
CFGStmtMap.h
NeverFallThroughOrReturn
@ NeverFallThroughOrReturn
Definition: AnalysisBasedWarnings.cpp:387
clang::SourceManager::isBeforeInTranslationUnit
bool isBeforeInTranslationUnit(SourceLocation LHS, SourceLocation RHS) const
Determines the order of 2 source locations in the translation unit.
Definition: SourceManager.cpp:1970
clang::threadSafety::POK_PassByRef
@ POK_PassByRef
Passing a guarded variable by reference.
Definition: ThreadSafety.h:47
clang::AnalysisDeclContext::isCFGBuilt
bool isCFGBuilt() const
Definition: AnalysisDeclContext.h:167
clang::threadSafety::LockKind
LockKind
This enum distinguishes between different kinds of lock actions.
Definition: ThreadSafety.h:56
clang::sema::FunctionScopeInfo
Retains information about a function, method, or block that is currently being parsed.
Definition: ScopeInfo.h:98
clang::Type::castAs
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:7218
clang::Expr::IgnoreParenCasts
Expr * IgnoreParenCasts() LLVM_READONLY
Skip past any parentheses and casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:2780
clang::CFGElement::Statement
@ Statement
Definition: CFG.h:66
flushDiagnostics
static void flushDiagnostics(Sema &S, const sema::FunctionScopeInfo *fscope)
Definition: AnalysisBasedWarnings.cpp:2149
clang::UninitUse::Sometimes
@ Sometimes
The use is uninitialized whenever a certain branch is taken.
Definition: UninitializedValues.h:74
clang::UninitUse::branch_iterator
SmallVectorImpl< Branch >::const_iterator branch_iterator
Definition: UninitializedValues.h:96
clang::UninitUse::AfterDecl
@ AfterDecl
The use is uninitialized the first time it is reached after we reach the variable's declaration.
Definition: UninitializedValues.h:78
clang::ParentMap
Definition: ParentMap.h:20
Consumed.h
clang::sema::AnalysisBasedWarnings::Policy
Definition: AnalysisBasedWarnings.h:34
SourceLocation.h
clang::UninitVariablesAnalysisStats::NumVariablesAnalyzed
unsigned NumVariablesAnalyzed
Definition: UninitializedValues.h:124
P
StringRef P
Definition: ASTMatchersInternal.cpp:563
clang::CFGBlock::FilteredCFGBlockIterator
Definition: CFG.h:993
clang::CFGStmt
Definition: CFG.h:132
clang::UninitUse::branch_end
branch_iterator branch_end() const
Definition: UninitializedValues.h:100
clang::CFGElement::castAs
T castAs() const
Convert to the specified CFGElement type, asserting that this CFGElement is of the desired type.
Definition: CFG.h:98
clang::Stmt::getStmtClass
StmtClass getStmtClass() const
Definition: Stmt.h:1162
clang::AnalysisDeclContext::getCFGBuildOptions
CFG::BuildOptions & getCFGBuildOptions()
Definition: AnalysisDeclContext.h:110
false
#define false
Definition: stdbool.h:17
isEnabled
static unsigned isEnabled(DiagnosticsEngine &D, unsigned diag)
Definition: AnalysisBasedWarnings.cpp:2117
clang::CFGElement::getAs
Optional< T > getAs() const
Convert to the specified CFGElement type, returning None if this CFGElement is not of the desired typ...
Definition: CFG.h:109
clang::UninitUse::getKind
Kind getKind() const
Get the kind of uninitialized use.
Definition: UninitializedValues.h:89
clang::BinaryOperator::getLHS
Expr * getLHS() const
Definition: Expr.h:3776
clang::CFGBlock::succ_end
succ_iterator succ_end()
Definition: CFG.h:956
isInLoop
static bool isInLoop(const ASTContext &Ctx, const ParentMap &PM, const Stmt *S)
Definition: AnalysisBasedWarnings.cpp:1328
clang::reachable_code::Callback
Definition: ReachableCode.h:47
clang::FunctionProtoType
Represents a prototype with parameter type info, e.g.
Definition: Type.h:3880
getLastStmt
static std::pair< const Stmt *, const CFGBlock * > getLastStmt(const ExplodedNode *Node)
Definition: ExprEngineCallAndReturn.cpp:76
clang::threadSafety::POK_VarDereference
@ POK_VarDereference
Dereferencing a variable (e.g. p in *p = 5;)
Definition: ThreadSafety.h:38
MaybeFallThrough
@ MaybeFallThrough
Definition: AnalysisBasedWarnings.cpp:385
clang::Expr::getExprLoc
SourceLocation getExprLoc() const LLVM_READONLY
getExprLoc - Return the preferred location for the arrow when diagnosing a problem with a generic exp...
Definition: Expr.cpp:228
SM
SourceManager & SM
Definition: AnalysisBasedWarnings.cpp:1713
clang::QualType::isNull
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:726
clang::BlockExpr
BlockExpr - Adaptor class for mixing a BlockDecl with expressions.
Definition: Expr.h:5889
clang::CFGBlock::getLabel
Stmt * getLabel()
Definition: CFG.h:1069
llvm::ArrayRef< unsigned >
clang::Decl
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:89
clang::CFGBlock::pred_begin
pred_iterator pred_begin()
Definition: CFG.h:937
throwEscapes
static bool throwEscapes(Sema &S, const CXXThrowExpr *E, CFGBlock &ThrowBlock, CFG *Body)
Determine whether an exception thrown by E, unwinding from ThrowBlock, can reach ExitBlock.
Definition: AnalysisBasedWarnings.cpp:283
clang::Expr::IgnoreParenImpCasts
Expr * IgnoreParenImpCasts() LLVM_READONLY
Skip past any parentheses and implicit casts which might surround this expression until reaching a fi...
Definition: Expr.cpp:2775
clang::ObjCPropertyDecl
Represents one property declaration in an Objective-C interface.
Definition: DeclObjC.h:729
clang::NeverCalledReason
NeverCalledReason
Definition: CalledOnceCheck.h:36
clang::Sema
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:343
clang::FunctionDecl::TK_NonTemplate
@ TK_NonTemplate
Definition: Decl.h:1820
StmtVisitor.h
clang::CXXThrowExpr::getSubExpr
const Expr * getSubExpr() const
Definition: ExprCXX.h:1201
clang::BinaryOperator::getOperatorLoc
SourceLocation getOperatorLoc() const
Definition: Expr.h:3768
clang::Sema::handlerCanCatch
bool handlerCanCatch(QualType HandlerType, QualType ExceptionType)
Definition: SemaExceptionSpec.cpp:671
clang::CFGStmt::getStmt
const Stmt * getStmt() const
Definition: CFG.h:138
State
LineState State
Definition: UnwrappedLineFormatter.cpp:959
clang::CFG::getEntry
CFGBlock & getEntry()
Definition: CFG.h:1331
clang::ParentMap::getParent
Stmt * getParent(Stmt *) const
Definition: ParentMap.cpp:134
clang::sema::FunctionScopeInfo::isCoroutine
bool isCoroutine() const
Definition: ScopeInfo.h:468
clang::VarDecl::getInit
const Expr * getInit() const
Definition: Decl.h:1243
hasRecursiveCallInPath
static bool hasRecursiveCallInPath(const FunctionDecl *FD, CFGBlock &Block)
Definition: AnalysisBasedWarnings.cpp:188
clang::AnalysisDeclContext::getBody
Stmt * getBody() const
Definition: AnalysisDeclContext.cpp:126
clang::SourceLocation::isMacroID
bool isMacroID() const
Definition: SourceLocation.h:103
checkThrowInNonThrowingFunc
static void checkThrowInNonThrowingFunc(Sema &S, const FunctionDecl *FD, AnalysisDeclContext &AC)
Definition: AnalysisBasedWarnings.cpp:358
clang::CFGElement
Represents a top-level expression in a basic block.
Definition: CFG.h:55
getFallthroughAttrSpelling
static StringRef getFallthroughAttrSpelling(Preprocessor &PP, SourceLocation Loc)
Definition: AnalysisBasedWarnings.cpp:1228
clang::ObjCPropertyAttribute::Kind
Kind
Definition: DeclObjCCommon.h:22
clang::CFG::BuildOptions::AddCXXNewAllocator
bool AddCXXNewAllocator
Definition: CFG.h:1248
clang::IfStmt::getCond
Expr * getCond()
Definition: Stmt.h:1979
clang::CFG::BuildOptions::AddImplicitDtors
bool AddImplicitDtors
Definition: CFG.h:1242
clang::Sema::getPreprocessor
Preprocessor & getPreprocessor() const
Definition: Sema.h:1527
clang::Decl::getBody
virtual Stmt * getBody() const
getBody - If this Decl represents a declaration for a body of code, such as a function or method defi...
Definition: DeclBase.h:1010
clang::reachable_code::UK_Return
@ UK_Return
Definition: ReachableCode.h:41
isNoexcept
static bool isNoexcept(const FunctionDecl *FD)
Definition: AnalysisBasedWarnings.cpp:371
clang::ObjCMethodDecl
ObjCMethodDecl - Represents an instance or class method declaration.
Definition: DeclObjC.h:139
clang::sema::FunctionScopeInfo::WeakObjectUseMap
llvm::SmallDenseMap< WeakObjectProfileTy, WeakUseVector, 8, WeakObjectProfileTy::DenseMapInfo > WeakObjectUseMap
Used to collect all uses of weak objects in a function body.
Definition: ScopeInfo.h:359
ScopeInfo.h
clang::BinaryOperator::isLogicalOp
static bool isLogicalOp(Opcode Opc)
Definition: Expr.h:3859
ParentMap.h
clang::sema::FunctionScopeInfo::WeakObjectProfileTy
Represents a simple identification of a weak object.
Definition: ScopeInfo.h:250
clang::DiagnosticsEngine::getIgnoreAllWarnings
bool getIgnoreAllWarnings() const
Definition: Diagnostic.h:646
clang::SourceLocation::isInvalid
bool isInvalid() const
Definition: SourceLocation.h:111
clang
Dataflow Directional Tag Classes.
Definition: CalledOnceCheck.h:17
memset
__DEVICE__ void * memset(void *__a, int __b, size_t __c)
Definition: __clang_cuda_device_functions.h:1480
diagnoseRepeatedUseOfWeak
static void diagnoseRepeatedUseOfWeak(Sema &S, const sema::FunctionScopeInfo *CurFn, const Decl *D, const ParentMap &PM)
Definition: AnalysisBasedWarnings.cpp:1353
clang::CFGBlock::FilterOptions::IgnoreDefaultsWithCoveredEnums
unsigned IgnoreDefaultsWithCoveredEnums
Definition: CFG.h:983
clang::reachable_code::UK_Other
@ UK_Other
Definition: ReachableCode.h:44
RecursiveASTVisitor.h
clang::UninitUse::branch_begin
branch_iterator branch_begin() const
Branches which inevitably result in the variable being used uninitialized.
Definition: UninitializedValues.h:99
CFG.h
DiagUninitUse
static void DiagUninitUse(Sema &S, const VarDecl *VD, const UninitUse &Use, bool IsCapturedByBlock)
DiagUninitUse – Helper function to produce a diagnostic for an uninitialized use of a variable.
Definition: AnalysisBasedWarnings.cpp:812
clang::AnalysisDeclContext::getDecl
const Decl * getDecl() const
Definition: AnalysisDeclContext.h:106
clang::DeclaratorContext::Block
@ Block
clang::Stmt
Stmt - This represents one statement.
Definition: Stmt.h:68
clang::CFGBlock::hasNoReturnElement
bool hasNoReturnElement() const
Definition: CFG.h:1072
clang::ConditionalOperator::getCond
Expr * getCond() const
Definition: Expr.h:4088
clang::SourceManager::isInSystemHeader
bool isInSystemHeader(SourceLocation Loc) const
Returns if a SourceLocation is in a system header.
Definition: SourceManager.h:1485
EvaluateAsInt
static bool EvaluateAsInt(const Expr *E, Expr::EvalResult &ExprResult, const ASTContext &Ctx, Expr::SideEffectsKind AllowSideEffects, EvalInfo &Info)
Definition: ExprConstant.cpp:14688
clang::CFGBlock::getTerminatorStmt
Stmt * getTerminatorStmt()
Definition: CFG.h:1050
clang::CFGBlock::FilteredCFGBlockIterator::hasMore
bool hasMore() const
Definition: CFG.h:1008
DiagnoseUninitializedConstRefUse
static bool DiagnoseUninitializedConstRefUse(Sema &S, const VarDecl *VD, const UninitUse &Use)
Diagnose uninitialized const reference usages.
Definition: AnalysisBasedWarnings.cpp:980
clang::Expr::getType
QualType getType() const
Definition: Expr.h:141
clang::SourceLocation::isValid
bool isValid() const
Return true if this is a valid SourceLocation object.
Definition: SourceLocation.h:110
clang::NamedDecl::getDeclName
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:287
EmitDiagForCXXThrowInNonThrowingFunc
static void EmitDiagForCXXThrowInNonThrowingFunc(Sema &S, SourceLocation OpLoc, const FunctionDecl *FD)
Definition: AnalysisBasedWarnings.cpp:338
clang::FixItHint::CreateRemoval
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:122
s
__device__ __2f16 float bool s
Definition: __clang_hip_libdevice_declares.h:303
clang::ConstEvaluatedExprVisitor
ConstEvaluatedExprVisitor - This class visits 'const Expr *'s.
Definition: EvaluatedExprVisitor.h:120
unsigned
clang::AnalysisDeclContext::getBlockForRegisteredExpression
const CFGBlock * getBlockForRegisteredExpression(const Stmt *stmt)
Definition: AnalysisDeclContext.cpp:190
clang::Stmt::getBeginLoc
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:336
clang::IfStmt::getThen
Stmt * getThen()
Definition: Stmt.h:1991
clang::ObjCSubstitutionContext::Property
@ Property
The type of a property.
clang::runUninitializedVariablesAnalysis
void runUninitializedVariablesAnalysis(const DeclContext &dc, const CFG &cfg, AnalysisDeclContext &ac, UninitVariablesHandler &handler, UninitVariablesAnalysisStats &stats)
Definition: UninitializedValues.cpp:909
clang::reachable_code::UK_Break
@ UK_Break
Definition: ReachableCode.h:42
CalledOnceCheck.h
clang::CFG::BuildOptions::AddCXXDefaultInitExprInCtors
bool AddCXXDefaultInitExprInCtors
Definition: CFG.h:1249
clang::CFG::BuildOptions::Observer
CFGCallback * Observer
Definition: CFG.h:1238
clang::NestedNameSpecifier::TypeSpec
@ TypeSpec
A type, stored as a Type*.
Definition: NestedNameSpecifier.h:90
clang::FixItHint::RemoveRange
CharSourceRange RemoveRange
Code that should be replaced to correct the error.
Definition: Diagnostic.h:74
clang::sema::FunctionScopeInfo::HasFallthroughStmt
bool HasFallthroughStmt
Whether there is a fallthrough statement in this function.
Definition: ScopeInfo.h:128
ControlFlowKind
ControlFlowKind
Definition: AnalysisBasedWarnings.cpp:382
clang::index::SymbolKind::Function
@ Function
clang::threadSafety::getLockKindFromAccessKind
LockKind getLockKindFromAccessKind(AccessKind AK)
Helper function that returns a LockKind required for the given level of access.
Definition: ThreadSafety.cpp:2581
clang::isTemplateInstantiation
bool isTemplateInstantiation(TemplateSpecializationKind Kind)
Determine whether this template specialization kind refers to an instantiation of an entity (as oppos...
Definition: Specifiers.h:187
clang::AnalysisDeclContext::getCFG
CFG * getCFG()
Definition: AnalysisDeclContext.cpp:213
clang::ValueDecl::getType
QualType getType() const
Definition: Decl.h:645
clang::threadSafety::LEK_LockedSomePredecessors
@ LEK_LockedSomePredecessors
Definition: ThreadSafety.h:87
clang::threadSafety::runThreadSafetyAnalysis
void runThreadSafetyAnalysis(AnalysisDeclContext &AC, ThreadSafetyHandler &Handler, BeforeSet **Bset)
Check a function's CFG for thread-safety violations.
Definition: ThreadSafety.cpp:2568
visitReachableThrows
static void visitReachableThrows(CFG *BodyCFG, llvm::function_ref< void(const CXXThrowExpr *, CFGBlock &)> Visit)
Definition: AnalysisBasedWarnings.cpp:320
clang::Expr
This represents one expression.
Definition: Expr.h:109
clang::Preprocessor
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:129
clang::CFG::BuildOptions::AddTemporaryDtors
bool AddTemporaryDtors
Definition: CFG.h:1245
DiagList
TextDiagnosticBuffer::DiagList DiagList
Definition: VerifyDiagnosticConsumer.cpp:83
clang::Decl::getLocation
SourceLocation getLocation() const
Definition: DeclBase.h:430
NeverFallThrough
@ NeverFallThrough
Definition: AnalysisBasedWarnings.cpp:384
clang::SwitchCase::getSubStmt
Stmt * getSubStmt()
Definition: Stmt.h:1765
clang::DeclRefExpr
A reference to a declared variable, function, enum, etc.
Definition: Expr.h:1213
clang::FunctionDecl
Represents a function declaration or definition.
Definition: Decl.h:1811
clang::CallExpr
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2730
clang::reachable_code::ScanReachableFromBlock
unsigned ScanReachableFromBlock(const CFGBlock *Start, llvm::BitVector &Reachable)
ScanReachableFromBlock - Mark all blocks reachable from Start.
Definition: ReachableCode.cpp:674
StmtCXX.h
clang::CFG::BuildOptions::setAlwaysAdd
BuildOptions & setAlwaysAdd(Stmt::StmtClass stmtClass, bool val=true)
Definition: CFG.h:1262
clang::api_notes::EnumExtensibilityKind::Open
@ Open
clang::CXXMemberCallExpr
Represents a call to a member function that may be written either with member call syntax (e....
Definition: ExprCXX.h:177
clang::Preprocessor::getIdentifierInfo
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
Definition: Preprocessor.h:1200
clang::DeclaratorDecl::getTypeSourceInfo
TypeSourceInfo * getTypeSourceInfo() const
Definition: Decl.h:715
clang::FixItHint::CreateReplacement
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string.
Definition: Diagnostic.h:133
clang::DiagnosticsEngine::getSuppressSystemWarnings
bool getSuppressSystemWarnings() const
Definition: Diagnostic.h:683
clang::UninitUse
A use of a variable, which might be uninitialized.
Definition: UninitializedValues.h:30
clang::CXXMethodDecl::isVirtual
bool isVirtual() const
Definition: DeclCXX.h:1982
clang::CFG::BuildOptions::AddInitializers
bool AddInitializers
Definition: CFG.h:1241
clang::UninitUse::AfterCall
@ AfterCall
The use is uninitialized the first time it is reached after the function is called.
Definition: UninitializedValues.h:82
clang::CFGBlock::pred_end
pred_iterator pred_end()
Definition: CFG.h:938
clang::sema::AnalysisBasedWarnings::IssueWarnings
void IssueWarnings(Policy P, FunctionScopeInfo *fscope, const Decl *D, QualType BlockType)
Definition: AnalysisBasedWarnings.cpp:2155
clang::CXXMethodDecl
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:1937
checkRecursiveFunction
static void checkRecursiveFunction(Sema &S, const FunctionDecl *FD, const Stmt *Body, AnalysisDeclContext &AC)
Definition: AnalysisBasedWarnings.cpp:255