1 //==- ExprInspectionChecker.cpp - Used for regression tests ------*- C++ -*-==//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "clang/Analysis/IssueHash.h"
10 #include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
11 #include "clang/StaticAnalyzer/Checkers/SValExplainer.h"
12 #include "clang/StaticAnalyzer/Checkers/Taint.h"
13 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
14 #include "clang/StaticAnalyzer/Core/Checker.h"
15 #include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
16 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
17 #include "clang/StaticAnalyzer/Core/PathSensitive/DynamicExtent.h"
18 #include "llvm/ADT/StringSwitch.h"
19 #include "llvm/Support/ScopedPrinter.h"
20 #include <optional>
21
22 using namespace clang;
23 using namespace ento;
24
25 namespace {
26 class ExprInspectionChecker
27 : public Checker<eval::Call, check::DeadSymbols, check::EndAnalysis> {
28 const BugType BT{this, "Checking analyzer assumptions", "debug"};
29
30 // These stats are per-analysis, not per-branch, hence they shouldn't
31 // stay inside the program state.
32 struct ReachedStat {
33 ExplodedNode *ExampleNode;
34 unsigned NumTimesReached;
35 };
36 mutable llvm::DenseMap<const CallExpr *, ReachedStat> ReachedStats;
37
38 void analyzerEval(const CallExpr *CE, CheckerContext &C) const;
39 void analyzerCheckInlined(const CallExpr *CE, CheckerContext &C) const;
40 void analyzerWarnIfReached(const CallExpr *CE, CheckerContext &C) const;
41 void analyzerNumTimesReached(const CallExpr *CE, CheckerContext &C) const;
42 void analyzerCrash(const CallExpr *CE, CheckerContext &C) const;
43 void analyzerWarnOnDeadSymbol(const CallExpr *CE, CheckerContext &C) const;
44 void analyzerValue(const CallExpr *CE, CheckerContext &C) const;
45 void analyzerDumpSValType(const CallExpr *CE, CheckerContext &C) const;
46 void analyzerDump(const CallExpr *CE, CheckerContext &C) const;
47 void analyzerExplain(const CallExpr *CE, CheckerContext &C) const;
48 void analyzerPrintState(const CallExpr *CE, CheckerContext &C) const;
49 void analyzerGetExtent(const CallExpr *CE, CheckerContext &C) const;
50 void analyzerDumpExtent(const CallExpr *CE, CheckerContext &C) const;
51 void analyzerDumpElementCount(const CallExpr *CE, CheckerContext &C) const;
52 void analyzerHashDump(const CallExpr *CE, CheckerContext &C) const;
53 void analyzerDenote(const CallExpr *CE, CheckerContext &C) const;
54 void analyzerExpress(const CallExpr *CE, CheckerContext &C) const;
55 void analyzerIsTainted(const CallExpr *CE, CheckerContext &C) const;
56
57 typedef void (ExprInspectionChecker::*FnCheck)(const CallExpr *,
58 CheckerContext &C) const;
59
60 // Optional parameter `ExprVal` for expression value to be marked interesting.
61 ExplodedNode *reportBug(llvm::StringRef Msg, CheckerContext &C,
62 std::optional<SVal> ExprVal = std::nullopt) const;
63 ExplodedNode *reportBug(llvm::StringRef Msg, BugReporter &BR, ExplodedNode *N,
64 std::optional<SVal> ExprVal = std::nullopt) const;
65 template <typename T> void printAndReport(CheckerContext &C, T What) const;
66
67 const Expr *getArgExpr(const CallExpr *CE, CheckerContext &C) const;
68 const MemRegion *getArgRegion(const CallExpr *CE, CheckerContext &C) const;
69
70 public:
71 bool evalCall(const CallEvent &Call, CheckerContext &C) const;
72 void checkDeadSymbols(SymbolReaper &SymReaper, CheckerContext &C) const;
73 void checkEndAnalysis(ExplodedGraph &G, BugReporter &BR,
74 ExprEngine &Eng) const;
75 };
76 } // namespace
77
REGISTER_SET_WITH_PROGRAMSTATE(MarkedSymbols,SymbolRef)78 REGISTER_SET_WITH_PROGRAMSTATE(MarkedSymbols, SymbolRef)
79 REGISTER_MAP_WITH_PROGRAMSTATE(DenotedSymbols, SymbolRef, const StringLiteral *)
80
81 bool ExprInspectionChecker::evalCall(const CallEvent &Call,
82 CheckerContext &C) const {
83 const auto *CE = dyn_cast_or_null<CallExpr>(Call.getOriginExpr());
84 if (!CE)
85 return false;
86
87 // These checks should have no effect on the surrounding environment
88 // (globals should not be invalidated, etc), hence the use of evalCall.
89 FnCheck Handler =
90 llvm::StringSwitch<FnCheck>(C.getCalleeName(CE))
91 .Case("clang_analyzer_eval", &ExprInspectionChecker::analyzerEval)
92 .Case("clang_analyzer_checkInlined",
93 &ExprInspectionChecker::analyzerCheckInlined)
94 .Case("clang_analyzer_crash", &ExprInspectionChecker::analyzerCrash)
95 .Case("clang_analyzer_warnIfReached",
96 &ExprInspectionChecker::analyzerWarnIfReached)
97 .Case("clang_analyzer_warnOnDeadSymbol",
98 &ExprInspectionChecker::analyzerWarnOnDeadSymbol)
99 .StartsWith("clang_analyzer_explain",
100 &ExprInspectionChecker::analyzerExplain)
101 .Case("clang_analyzer_dumpExtent",
102 &ExprInspectionChecker::analyzerDumpExtent)
103 .Case("clang_analyzer_dumpElementCount",
104 &ExprInspectionChecker::analyzerDumpElementCount)
105 .Case("clang_analyzer_value", &ExprInspectionChecker::analyzerValue)
106 .StartsWith("clang_analyzer_dumpSvalType",
107 &ExprInspectionChecker::analyzerDumpSValType)
108 .StartsWith("clang_analyzer_dump",
109 &ExprInspectionChecker::analyzerDump)
110 .Case("clang_analyzer_getExtent",
111 &ExprInspectionChecker::analyzerGetExtent)
112 .Case("clang_analyzer_printState",
113 &ExprInspectionChecker::analyzerPrintState)
114 .Case("clang_analyzer_numTimesReached",
115 &ExprInspectionChecker::analyzerNumTimesReached)
116 .Case("clang_analyzer_hashDump",
117 &ExprInspectionChecker::analyzerHashDump)
118 .Case("clang_analyzer_denote", &ExprInspectionChecker::analyzerDenote)
119 .Case("clang_analyzer_express", // This also marks the argument as
120 // interesting.
121 &ExprInspectionChecker::analyzerExpress)
122 .StartsWith("clang_analyzer_isTainted",
123 &ExprInspectionChecker::analyzerIsTainted)
124 .Default(nullptr);
125
126 if (!Handler)
127 return false;
128
129 (this->*Handler)(CE, C);
130 return true;
131 }
132
getArgumentValueString(const CallExpr * CE,CheckerContext & C)133 static const char *getArgumentValueString(const CallExpr *CE,
134 CheckerContext &C) {
135 if (CE->getNumArgs() == 0)
136 return "Missing assertion argument";
137
138 ExplodedNode *N = C.getPredecessor();
139 const LocationContext *LC = N->getLocationContext();
140 ProgramStateRef State = N->getState();
141
142 const Expr *Assertion = CE->getArg(0);
143 SVal AssertionVal = State->getSVal(Assertion, LC);
144
145 if (AssertionVal.isUndef())
146 return "UNDEFINED";
147
148 ProgramStateRef StTrue, StFalse;
149 std::tie(StTrue, StFalse) =
150 State->assume(AssertionVal.castAs<DefinedOrUnknownSVal>());
151
152 if (StTrue) {
153 if (StFalse)
154 return "UNKNOWN";
155 else
156 return "TRUE";
157 } else {
158 if (StFalse)
159 return "FALSE";
160 else
161 llvm_unreachable("Invalid constraint; neither true or false.");
162 }
163 }
164
165 ExplodedNode *
reportBug(llvm::StringRef Msg,CheckerContext & C,std::optional<SVal> ExprVal) const166 ExprInspectionChecker::reportBug(llvm::StringRef Msg, CheckerContext &C,
167 std::optional<SVal> ExprVal) const {
168 ExplodedNode *N = C.generateNonFatalErrorNode();
169 reportBug(Msg, C.getBugReporter(), N, ExprVal);
170 return N;
171 }
172
173 ExplodedNode *
reportBug(llvm::StringRef Msg,BugReporter & BR,ExplodedNode * N,std::optional<SVal> ExprVal) const174 ExprInspectionChecker::reportBug(llvm::StringRef Msg, BugReporter &BR,
175 ExplodedNode *N,
176 std::optional<SVal> ExprVal) const {
177 if (!N)
178 return nullptr;
179 auto R = std::make_unique<PathSensitiveBugReport>(BT, Msg, N);
180 if (ExprVal) {
181 R->markInteresting(*ExprVal);
182 }
183 BR.emitReport(std::move(R));
184 return N;
185 }
186
getArgExpr(const CallExpr * CE,CheckerContext & C) const187 const Expr *ExprInspectionChecker::getArgExpr(const CallExpr *CE,
188 CheckerContext &C) const {
189 if (CE->getNumArgs() == 0) {
190 reportBug("Missing argument", C);
191 return nullptr;
192 }
193 return CE->getArg(0);
194 }
195
getArgRegion(const CallExpr * CE,CheckerContext & C) const196 const MemRegion *ExprInspectionChecker::getArgRegion(const CallExpr *CE,
197 CheckerContext &C) const {
198 const Expr *Arg = getArgExpr(CE, C);
199 if (!Arg)
200 return nullptr;
201
202 const MemRegion *MR = C.getSVal(Arg).getAsRegion();
203 if (!MR) {
204 reportBug("Cannot obtain the region", C);
205 return nullptr;
206 }
207
208 return MR;
209 }
210
analyzerEval(const CallExpr * CE,CheckerContext & C) const211 void ExprInspectionChecker::analyzerEval(const CallExpr *CE,
212 CheckerContext &C) const {
213 const LocationContext *LC = C.getPredecessor()->getLocationContext();
214
215 // A specific instantiation of an inlined function may have more constrained
216 // values than can generally be assumed. Skip the check.
217 if (LC->getStackFrame()->getParent() != nullptr)
218 return;
219
220 reportBug(getArgumentValueString(CE, C), C);
221 }
222
analyzerWarnIfReached(const CallExpr * CE,CheckerContext & C) const223 void ExprInspectionChecker::analyzerWarnIfReached(const CallExpr *CE,
224 CheckerContext &C) const {
225 reportBug("REACHABLE", C);
226 }
227
analyzerNumTimesReached(const CallExpr * CE,CheckerContext & C) const228 void ExprInspectionChecker::analyzerNumTimesReached(const CallExpr *CE,
229 CheckerContext &C) const {
230 ++ReachedStats[CE].NumTimesReached;
231 if (!ReachedStats[CE].ExampleNode) {
232 // Later, in checkEndAnalysis, we'd throw a report against it.
233 ReachedStats[CE].ExampleNode = C.generateNonFatalErrorNode();
234 }
235 }
236
analyzerCheckInlined(const CallExpr * CE,CheckerContext & C) const237 void ExprInspectionChecker::analyzerCheckInlined(const CallExpr *CE,
238 CheckerContext &C) const {
239 const LocationContext *LC = C.getPredecessor()->getLocationContext();
240
241 // An inlined function could conceivably also be analyzed as a top-level
242 // function. We ignore this case and only emit a message (TRUE or FALSE)
243 // when we are analyzing it as an inlined function. This means that
244 // clang_analyzer_checkInlined(true) should always print TRUE, but
245 // clang_analyzer_checkInlined(false) should never actually print anything.
246 if (LC->getStackFrame()->getParent() == nullptr)
247 return;
248
249 reportBug(getArgumentValueString(CE, C), C);
250 }
251
analyzerExplain(const CallExpr * CE,CheckerContext & C) const252 void ExprInspectionChecker::analyzerExplain(const CallExpr *CE,
253 CheckerContext &C) const {
254 const Expr *Arg = getArgExpr(CE, C);
255 if (!Arg)
256 return;
257
258 SVal V = C.getSVal(Arg);
259 SValExplainer Ex(C.getASTContext());
260 reportBug(Ex.Visit(V), C);
261 }
262
printHelper(llvm::raw_svector_ostream & Out,CheckerContext & C,const llvm::APSInt & I)263 static void printHelper(llvm::raw_svector_ostream &Out, CheckerContext &C,
264 const llvm::APSInt &I) {
265 Out << I.getBitWidth() << (I.isUnsigned() ? "u:" : "s:");
266 Out << I;
267 }
268
printHelper(llvm::raw_svector_ostream & Out,CheckerContext & C,SymbolRef Sym)269 static void printHelper(llvm::raw_svector_ostream &Out, CheckerContext &C,
270 SymbolRef Sym) {
271 C.getConstraintManager().printValue(Out, C.getState(), Sym);
272 }
273
printHelper(llvm::raw_svector_ostream & Out,CheckerContext & C,SVal V)274 static void printHelper(llvm::raw_svector_ostream &Out, CheckerContext &C,
275 SVal V) {
276 Out << V;
277 }
278
279 template <typename T>
printAndReport(CheckerContext & C,T What) const280 void ExprInspectionChecker::printAndReport(CheckerContext &C, T What) const {
281 llvm::SmallString<64> Str;
282 llvm::raw_svector_ostream OS(Str);
283 printHelper(OS, C, What);
284 reportBug(OS.str(), C);
285 }
286
analyzerValue(const CallExpr * CE,CheckerContext & C) const287 void ExprInspectionChecker::analyzerValue(const CallExpr *CE,
288 CheckerContext &C) const {
289 const Expr *Arg = getArgExpr(CE, C);
290 if (!Arg)
291 return;
292
293 SVal V = C.getSVal(Arg);
294 if (const SymbolRef Sym = V.getAsSymbol())
295 printAndReport(C, Sym);
296 else if (const llvm::APSInt *I = V.getAsInteger())
297 printAndReport(C, *I);
298 else
299 reportBug("n/a", C);
300 }
301
analyzerDumpSValType(const CallExpr * CE,CheckerContext & C) const302 void ExprInspectionChecker::analyzerDumpSValType(const CallExpr *CE,
303 CheckerContext &C) const {
304 const Expr *Arg = getArgExpr(CE, C);
305 if (!Arg)
306 return;
307
308 QualType Ty = C.getSVal(Arg).getType(C.getASTContext());
309 reportBug(Ty.getAsString(), C);
310 }
311
analyzerDump(const CallExpr * CE,CheckerContext & C) const312 void ExprInspectionChecker::analyzerDump(const CallExpr *CE,
313 CheckerContext &C) const {
314 const Expr *Arg = getArgExpr(CE, C);
315 if (!Arg)
316 return;
317
318 SVal V = C.getSVal(Arg);
319 printAndReport(C, V);
320 }
321
analyzerGetExtent(const CallExpr * CE,CheckerContext & C) const322 void ExprInspectionChecker::analyzerGetExtent(const CallExpr *CE,
323 CheckerContext &C) const {
324 const Expr *Arg = getArgExpr(CE, C);
325 if (!Arg)
326 return;
327
328 ProgramStateRef State = C.getState();
329 SVal Size = getDynamicExtentWithOffset(State, C.getSVal(Arg));
330
331 State = State->BindExpr(CE, C.getLocationContext(), Size);
332 C.addTransition(State);
333 }
334
analyzerDumpExtent(const CallExpr * CE,CheckerContext & C) const335 void ExprInspectionChecker::analyzerDumpExtent(const CallExpr *CE,
336 CheckerContext &C) const {
337 const Expr *Arg = getArgExpr(CE, C);
338 if (!Arg)
339 return;
340
341 ProgramStateRef State = C.getState();
342 SVal Size = getDynamicExtentWithOffset(State, C.getSVal(Arg));
343 printAndReport(C, Size);
344 }
345
analyzerDumpElementCount(const CallExpr * CE,CheckerContext & C) const346 void ExprInspectionChecker::analyzerDumpElementCount(const CallExpr *CE,
347 CheckerContext &C) const {
348 const MemRegion *MR = getArgRegion(CE, C);
349 if (!MR)
350 return;
351
352 QualType ElementTy;
353 if (const auto *TVR = MR->getAs<TypedValueRegion>()) {
354 ElementTy = TVR->getValueType();
355 } else {
356 ElementTy = MR->castAs<SymbolicRegion>()->getPointeeStaticType();
357 }
358
359 assert(!ElementTy->isPointerType());
360
361 DefinedOrUnknownSVal ElementCount = getDynamicElementCountWithOffset(
362 C.getState(), C.getSVal(getArgExpr(CE, C)), ElementTy);
363 printAndReport(C, ElementCount);
364 }
365
analyzerPrintState(const CallExpr * CE,CheckerContext & C) const366 void ExprInspectionChecker::analyzerPrintState(const CallExpr *CE,
367 CheckerContext &C) const {
368 C.getState()->dump();
369 }
370
analyzerWarnOnDeadSymbol(const CallExpr * CE,CheckerContext & C) const371 void ExprInspectionChecker::analyzerWarnOnDeadSymbol(const CallExpr *CE,
372 CheckerContext &C) const {
373 const Expr *Arg = getArgExpr(CE, C);
374 if (!Arg)
375 return;
376
377 SVal Val = C.getSVal(Arg);
378 SymbolRef Sym = Val.getAsSymbol();
379 if (!Sym)
380 return;
381
382 ProgramStateRef State = C.getState();
383 State = State->add<MarkedSymbols>(Sym);
384 C.addTransition(State);
385 }
386
checkDeadSymbols(SymbolReaper & SymReaper,CheckerContext & C) const387 void ExprInspectionChecker::checkDeadSymbols(SymbolReaper &SymReaper,
388 CheckerContext &C) const {
389 ProgramStateRef State = C.getState();
390 const MarkedSymbolsTy &Syms = State->get<MarkedSymbols>();
391 ExplodedNode *N = C.getPredecessor();
392 for (SymbolRef Sym : Syms) {
393 if (!SymReaper.isDead(Sym))
394 continue;
395
396 // The non-fatal error node should be the same for all reports.
397 if (ExplodedNode *BugNode = reportBug("SYMBOL DEAD", C))
398 N = BugNode;
399 State = State->remove<MarkedSymbols>(Sym);
400 }
401
402 for (auto I : State->get<DenotedSymbols>()) {
403 SymbolRef Sym = I.first;
404 if (!SymReaper.isLive(Sym))
405 State = State->remove<DenotedSymbols>(Sym);
406 }
407
408 C.addTransition(State, N);
409 }
410
checkEndAnalysis(ExplodedGraph & G,BugReporter & BR,ExprEngine & Eng) const411 void ExprInspectionChecker::checkEndAnalysis(ExplodedGraph &G, BugReporter &BR,
412 ExprEngine &Eng) const {
413 for (auto Item : ReachedStats) {
414 unsigned NumTimesReached = Item.second.NumTimesReached;
415 ExplodedNode *N = Item.second.ExampleNode;
416
417 reportBug(llvm::to_string(NumTimesReached), BR, N);
418 }
419 ReachedStats.clear();
420 }
421
analyzerCrash(const CallExpr * CE,CheckerContext & C) const422 void ExprInspectionChecker::analyzerCrash(const CallExpr *CE,
423 CheckerContext &C) const {
424 LLVM_BUILTIN_TRAP;
425 }
426
analyzerHashDump(const CallExpr * CE,CheckerContext & C) const427 void ExprInspectionChecker::analyzerHashDump(const CallExpr *CE,
428 CheckerContext &C) const {
429 const LangOptions &Opts = C.getLangOpts();
430 const SourceManager &SM = C.getSourceManager();
431 FullSourceLoc FL(CE->getArg(0)->getBeginLoc(), SM);
432 std::string HashContent =
433 getIssueString(FL, getCheckerName().getName(), "Category",
434 C.getLocationContext()->getDecl(), Opts);
435
436 reportBug(HashContent, C);
437 }
438
analyzerDenote(const CallExpr * CE,CheckerContext & C) const439 void ExprInspectionChecker::analyzerDenote(const CallExpr *CE,
440 CheckerContext &C) const {
441 if (CE->getNumArgs() < 2) {
442 reportBug("clang_analyzer_denote() requires a symbol and a string literal",
443 C);
444 return;
445 }
446
447 SymbolRef Sym = C.getSVal(CE->getArg(0)).getAsSymbol();
448 if (!Sym) {
449 reportBug("Not a symbol", C);
450 return;
451 }
452
453 const auto *E = dyn_cast<StringLiteral>(CE->getArg(1)->IgnoreParenCasts());
454 if (!E) {
455 reportBug("Not a string literal", C);
456 return;
457 }
458
459 ProgramStateRef State = C.getState();
460
461 C.addTransition(C.getState()->set<DenotedSymbols>(Sym, E));
462 }
463
464 namespace {
465 class SymbolExpressor
466 : public SymExprVisitor<SymbolExpressor, std::optional<std::string>> {
467 ProgramStateRef State;
468
469 public:
SymbolExpressor(ProgramStateRef State)470 SymbolExpressor(ProgramStateRef State) : State(State) {}
471
lookup(const SymExpr * S)472 std::optional<std::string> lookup(const SymExpr *S) {
473 if (const StringLiteral *const *SLPtr = State->get<DenotedSymbols>(S)) {
474 const StringLiteral *SL = *SLPtr;
475 return std::string(SL->getBytes());
476 }
477 return std::nullopt;
478 }
479
VisitSymExpr(const SymExpr * S)480 std::optional<std::string> VisitSymExpr(const SymExpr *S) {
481 return lookup(S);
482 }
483
VisitSymIntExpr(const SymIntExpr * S)484 std::optional<std::string> VisitSymIntExpr(const SymIntExpr *S) {
485 if (std::optional<std::string> Str = lookup(S))
486 return Str;
487 if (std::optional<std::string> Str = Visit(S->getLHS()))
488 return (*Str + " " + BinaryOperator::getOpcodeStr(S->getOpcode()) + " " +
489 std::to_string(S->getRHS().getLimitedValue()) +
490 (S->getRHS().isUnsigned() ? "U" : ""))
491 .str();
492 return std::nullopt;
493 }
494
VisitSymSymExpr(const SymSymExpr * S)495 std::optional<std::string> VisitSymSymExpr(const SymSymExpr *S) {
496 if (std::optional<std::string> Str = lookup(S))
497 return Str;
498 if (std::optional<std::string> Str1 = Visit(S->getLHS()))
499 if (std::optional<std::string> Str2 = Visit(S->getRHS()))
500 return (*Str1 + " " + BinaryOperator::getOpcodeStr(S->getOpcode()) +
501 " " + *Str2)
502 .str();
503 return std::nullopt;
504 }
505
VisitUnarySymExpr(const UnarySymExpr * S)506 std::optional<std::string> VisitUnarySymExpr(const UnarySymExpr *S) {
507 if (std::optional<std::string> Str = lookup(S))
508 return Str;
509 if (std::optional<std::string> Str = Visit(S->getOperand()))
510 return (UnaryOperator::getOpcodeStr(S->getOpcode()) + *Str).str();
511 return std::nullopt;
512 }
513
VisitSymbolCast(const SymbolCast * S)514 std::optional<std::string> VisitSymbolCast(const SymbolCast *S) {
515 if (std::optional<std::string> Str = lookup(S))
516 return Str;
517 if (std::optional<std::string> Str = Visit(S->getOperand()))
518 return (Twine("(") + S->getType().getAsString() + ")" + *Str).str();
519 return std::nullopt;
520 }
521 };
522 } // namespace
523
analyzerExpress(const CallExpr * CE,CheckerContext & C) const524 void ExprInspectionChecker::analyzerExpress(const CallExpr *CE,
525 CheckerContext &C) const {
526 const Expr *Arg = getArgExpr(CE, C);
527 if (!Arg)
528 return;
529
530 SVal ArgVal = C.getSVal(CE->getArg(0));
531 SymbolRef Sym = ArgVal.getAsSymbol();
532 if (!Sym) {
533 reportBug("Not a symbol", C, ArgVal);
534 return;
535 }
536
537 SymbolExpressor V(C.getState());
538 auto Str = V.Visit(Sym);
539 if (!Str) {
540 reportBug("Unable to express", C, ArgVal);
541 return;
542 }
543
544 reportBug(*Str, C, ArgVal);
545 }
546
analyzerIsTainted(const CallExpr * CE,CheckerContext & C) const547 void ExprInspectionChecker::analyzerIsTainted(const CallExpr *CE,
548 CheckerContext &C) const {
549 if (CE->getNumArgs() != 1) {
550 reportBug("clang_analyzer_isTainted() requires exactly one argument", C);
551 return;
552 }
553 const bool IsTainted =
554 taint::isTainted(C.getState(), CE->getArg(0), C.getLocationContext());
555 reportBug(IsTainted ? "YES" : "NO", C);
556 }
557
registerExprInspectionChecker(CheckerManager & Mgr)558 void ento::registerExprInspectionChecker(CheckerManager &Mgr) {
559 Mgr.registerChecker<ExprInspectionChecker>();
560 }
561
shouldRegisterExprInspectionChecker(const CheckerManager & mgr)562 bool ento::shouldRegisterExprInspectionChecker(const CheckerManager &mgr) {
563 return true;
564 }
565