clang 19.0.0git
ExprInspectionChecker.cpp
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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
18#include "llvm/ADT/StringSwitch.h"
19#include "llvm/Support/ScopedPrinter.h"
20#include <optional>
21
22using namespace clang;
23using namespace ento;
24
25namespace {
26class 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
70public:
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
80
81bool 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
133static 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
166ExprInspectionChecker::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
174ExprInspectionChecker::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
187const 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
196const 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
211void 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
223void ExprInspectionChecker::analyzerWarnIfReached(const CallExpr *CE,
224 CheckerContext &C) const {
225 reportBug("REACHABLE", C);
226}
227
228void 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
237void 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
252void 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
263static 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
269static void printHelper(llvm::raw_svector_ostream &Out, CheckerContext &C,
270 SymbolRef Sym) {
271 C.getConstraintManager().printValue(Out, C.getState(), Sym);
272}
273
274static void printHelper(llvm::raw_svector_ostream &Out, CheckerContext &C,
275 SVal V) {
276 Out << V;
277}
278
279template <typename T>
280void ExprInspectionChecker::printAndReport(CheckerContext &C, T What) const {
282 llvm::raw_svector_ostream OS(Str);
283 printHelper(OS, C, What);
284 reportBug(OS.str(), C);
285}
286
287void 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
302void 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
312void 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
322void 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
335void 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
346void 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
362 C.getState(), C.getSVal(getArgExpr(CE, C)), ElementTy);
363 printAndReport(C, ElementCount);
364}
365
366void ExprInspectionChecker::analyzerPrintState(const CallExpr *CE,
367 CheckerContext &C) const {
368 C.getState()->dump();
369}
370
371void 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
387void 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
411void 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
422void ExprInspectionChecker::analyzerCrash(const CallExpr *CE,
423 CheckerContext &C) const {
424 LLVM_BUILTIN_TRAP;
425}
426
427void 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
439void 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
464namespace {
465class SymbolExpressor
466 : public SymExprVisitor<SymbolExpressor, std::optional<std::string>> {
467 ProgramStateRef State;
468
469public:
470 SymbolExpressor(ProgramStateRef State) : State(State) {}
471
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
480 std::optional<std::string> VisitSymExpr(const SymExpr *S) {
481 return lookup(S);
482 }
483
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
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
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
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
524void 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
547void 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
558void ento::registerExprInspectionChecker(CheckerManager &Mgr) {
559 Mgr.registerChecker<ExprInspectionChecker>();
560}
561
562bool ento::shouldRegisterExprInspectionChecker(const CheckerManager &mgr) {
563 return true;
564}
#define V(N, I)
Definition: ASTContext.h:3273
#define SM(sm)
Definition: Cuda.cpp:82
static void printHelper(llvm::raw_svector_ostream &Out, CheckerContext &C, const llvm::APSInt &I)
static const char * getArgumentValueString(const CallExpr *CE, CheckerContext &C)
#define REGISTER_MAP_WITH_PROGRAMSTATE(Name, Key, Value)
Declares an immutable map of type NameTy, suitable for placement into the ProgramState.
#define REGISTER_SET_WITH_PROGRAMSTATE(Name, Elem)
Declares an immutable set of type NameTy, suitable for placement into the ProgramState.
static std::string getName(const CallEvent &Call)
StringRef getOpcodeStr() const
Definition: Expr.h:3905
CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]).
Definition: Expr.h:2820
Expr * getArg(unsigned Arg)
getArg - Return the specified argument.
Definition: Expr.h:3011
unsigned getNumArgs() const
getNumArgs - Return the number of actual arguments to this call.
Definition: Expr.h:2998
This represents one expression.
Definition: Expr.h:110
Expr * IgnoreParenCasts() LLVM_READONLY
Skip past any parentheses and casts which might surround this expression until reaching a fixed point...
Definition: Expr.cpp:3064
A SourceLocation and its associated SourceManager.
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:449
It wraps the AnalysisDeclContext to represent both the call stack with the help of StackFrameContext ...
const LocationContext * getParent() const
It might return null.
const StackFrameContext * getStackFrame() const
A (possibly-)qualified type.
Definition: Type.h:738
static std::string getAsString(SplitQualType split, const PrintingPolicy &Policy)
Definition: Type.h:1125
This class handles loading and caching of source files into memory.
SourceLocation getBeginLoc() const LLVM_READONLY
Definition: Stmt.cpp:338
StringLiteral - This represents a string literal expression, e.g.
Definition: Expr.h:1773
StringRef getBytes() const
Allow access to clients that need the byte representation, such as ASTWriterStmt::VisitStringLiteral(...
Definition: Expr.h:1858
bool isPointerType() const
Definition: Type.h:7402
static StringRef getOpcodeStr(Opcode Op)
getOpcodeStr - Turn an Opcode enum value into the punctuation char it corresponds to,...
Definition: Expr.cpp:1405
Template implementation for all binary symbolic expressions.
BugReporter is a utility class for generating PathDiagnostics for analysis.
Definition: BugReporter.h:585
virtual void emitReport(std::unique_ptr< BugReport > R)
Add the given report to the set of reports tracked by BugReporter.
Represents an abstract call to a function or method along a particular path.
Definition: CallEvent.h:153
CHECKER * registerChecker(AT &&... Args)
Used to register checkers.
const ProgramStateRef & getState() const
const LocationContext * getLocationContext() const
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:96
LLVM_ATTRIBUTE_RETURNS_NONNULL const RegionTy * castAs() const
Definition: MemRegion.h:1391
const RegionTy * getAs() const
Definition: MemRegion.h:1383
SVal - This represents a symbolic expression, which can be either an L-value or an R-value.
Definition: SVals.h:55
bool isUndef() const
Definition: SVals.h:104
SymbolRef getAsSymbol(bool IncludeBaseRegions=false) const
If this SVal wraps a symbol return that SymbolRef.
Definition: SVals.cpp:104
T castAs() const
Convert to the specified SVal type, asserting that this SVal is of the desired type.
Definition: SVals.h:82
SymExprVisitor - this class implements a simple visitor for SymExpr subclasses.
Definition: SValVisitor.h:66
RetTy Visit(SymbolRef S)
Definition: SValVisitor.h:72
RetTy VisitSymExpr(SymbolRef S)
Definition: SValVisitor.h:89
Symbolic value.
Definition: SymExpr.h:30
Represents a cast expression.
A class responsible for cleaning up unused symbols.
bool isDead(SymbolRef sym)
Returns whether or not a symbol has been confirmed dead.
bool isLive(SymbolRef sym)
SymbolicRegion - A special, "non-concrete" region.
Definition: MemRegion.h:775
TypedValueRegion - An abstract class representing regions having a typed value.
Definition: MemRegion.h:530
Represents a symbolic expression involving a unary operator.
bool isTainted(ProgramStateRef State, const Stmt *S, const LocationContext *LCtx, TaintTagType Kind=TaintTagGeneric)
Check if the statement has a tainted value in the given state.
Definition: Taint.cpp:147
SVal getDynamicExtentWithOffset(ProgramStateRef State, SVal BufV)
Get the dynamic extent for a symbolic value that represents a buffer.
DefinedOrUnknownSVal getDynamicElementCountWithOffset(ProgramStateRef State, SVal BufV, QualType Ty)
The JSON file list parser is used to communicate input to InstallAPI.
const FunctionProtoType * T
std::string getIssueString(const FullSourceLoc &IssueLoc, llvm::StringRef CheckerName, llvm::StringRef WarningMessage, const Decl *IssueDecl, const LangOptions &LangOpts)
Get the unhashed string representation of the V1 issue hash.