clang 19.0.0git
SValBuilder.cpp
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1//===- SValBuilder.cpp - Basic class for all SValBuilder implementations --===//
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 SValBuilder, the base class for all (complete) SValBuilder
10// implementations.
11//
12//===----------------------------------------------------------------------===//
13
16#include "clang/AST/Decl.h"
17#include "clang/AST/DeclCXX.h"
18#include "clang/AST/ExprCXX.h"
19#include "clang/AST/ExprObjC.h"
20#include "clang/AST/Stmt.h"
21#include "clang/AST/Type.h"
23#include "clang/Basic/LLVM.h"
36#include "llvm/ADT/APSInt.h"
37#include "llvm/Support/Casting.h"
38#include "llvm/Support/Compiler.h"
39#include <cassert>
40#include <optional>
41#include <tuple>
42
43using namespace clang;
44using namespace ento;
45
46//===----------------------------------------------------------------------===//
47// Basic SVal creation.
48//===----------------------------------------------------------------------===//
49
50void SValBuilder::anchor() {}
51
52SValBuilder::SValBuilder(llvm::BumpPtrAllocator &alloc, ASTContext &context,
53 ProgramStateManager &stateMgr)
54 : Context(context), BasicVals(context, alloc),
55 SymMgr(context, BasicVals, alloc), MemMgr(context, alloc),
56 StateMgr(stateMgr),
57 AnOpts(
58 stateMgr.getOwningEngine().getAnalysisManager().getAnalyzerOptions()),
59 ArrayIndexTy(context.LongLongTy),
60 ArrayIndexWidth(context.getTypeSize(ArrayIndexTy)) {}
61
64 return makeNullWithType(type);
65
66 if (type->isIntegralOrEnumerationType())
67 return makeIntVal(0, type);
68
69 if (type->isArrayType() || type->isRecordType() || type->isVectorType() ||
70 type->isAnyComplexType())
72
73 // FIXME: Handle floats.
74 return UnknownVal();
75}
76
79 const llvm::APSInt &rhs,
80 QualType type) {
81 // The Environment ensures we always get a persistent APSInt in
82 // BasicValueFactory, so we don't need to get the APSInt from
83 // BasicValueFactory again.
84 assert(lhs);
85 assert(!Loc::isLocType(type));
86 return nonloc::SymbolVal(SymMgr.getSymIntExpr(lhs, op, rhs, type));
87}
88
91 const SymExpr *rhs, QualType type) {
92 assert(rhs);
93 assert(!Loc::isLocType(type));
94 return nonloc::SymbolVal(SymMgr.getIntSymExpr(lhs, op, rhs, type));
95}
96
99 const SymExpr *rhs, QualType type) {
100 assert(lhs && rhs);
101 assert(!Loc::isLocType(type));
102 return nonloc::SymbolVal(SymMgr.getSymSymExpr(lhs, op, rhs, type));
103}
104
106 QualType type) {
107 assert(operand);
108 assert(!Loc::isLocType(type));
109 return nonloc::SymbolVal(SymMgr.getUnarySymExpr(operand, op, type));
110}
111
113 QualType fromTy, QualType toTy) {
114 assert(operand);
115 assert(!Loc::isLocType(toTy));
116 if (fromTy == toTy)
117 return nonloc::SymbolVal(operand);
118 return nonloc::SymbolVal(SymMgr.getCastSymbol(operand, fromTy, toTy));
119}
120
122 if (val.isUnknownOrUndef())
123 return val;
124
125 // Common case: we have an appropriately sized integer.
126 if (std::optional<nonloc::ConcreteInt> CI =
127 val.getAs<nonloc::ConcreteInt>()) {
128 const llvm::APSInt& I = CI->getValue();
129 if (I.getBitWidth() == ArrayIndexWidth && I.isSigned())
130 return val;
131 }
132
133 return evalCast(val, ArrayIndexTy, QualType{});
134}
135
137 return makeTruthVal(boolean->getValue());
138}
139
142 QualType T = region->getValueType();
143
144 if (T->isNullPtrType())
145 return makeZeroVal(T);
146
148 return UnknownVal();
149
151
152 if (Loc::isLocType(T))
154
155 return nonloc::SymbolVal(sym);
156}
157
159 const Expr *Ex,
160 const LocationContext *LCtx,
161 unsigned Count) {
162 QualType T = Ex->getType();
163
164 if (T->isNullPtrType())
165 return makeZeroVal(T);
166
167 // Compute the type of the result. If the expression is not an R-value, the
168 // result should be a location.
169 QualType ExType = Ex->getType();
170 if (Ex->isGLValue())
172
173 return conjureSymbolVal(SymbolTag, Ex, LCtx, T, Count);
174}
175
177 const Expr *expr,
178 const LocationContext *LCtx,
180 unsigned count) {
181 if (type->isNullPtrType())
182 return makeZeroVal(type);
183
185 return UnknownVal();
186
187 SymbolRef sym = SymMgr.conjureSymbol(expr, LCtx, type, count, symbolTag);
188
189 if (Loc::isLocType(type))
191
192 return nonloc::SymbolVal(sym);
193}
194
196 const LocationContext *LCtx,
198 unsigned visitCount) {
199 if (type->isNullPtrType())
200 return makeZeroVal(type);
201
203 return UnknownVal();
204
205 SymbolRef sym = SymMgr.conjureSymbol(stmt, LCtx, type, visitCount);
206
207 if (Loc::isLocType(type))
209
210 return nonloc::SymbolVal(sym);
211}
212
215 const LocationContext *LCtx,
216 unsigned VisitCount) {
217 QualType T = E->getType();
218 return getConjuredHeapSymbolVal(E, LCtx, T, VisitCount);
219}
220
223 const LocationContext *LCtx,
224 QualType type, unsigned VisitCount) {
225 assert(Loc::isLocType(type));
227 if (type->isNullPtrType())
228 return makeZeroVal(type);
229
232}
233
235 const LocationContext *LCtx,
236 unsigned VisitCount) {
237 const AllocaRegion *R =
239 return loc::MemRegionVal(R);
240}
241
243 const MemRegion *region,
244 const Expr *expr, QualType type,
245 const LocationContext *LCtx,
246 unsigned count) {
247 assert(SymbolManager::canSymbolicate(type) && "Invalid metadata symbol type");
248
249 SymbolRef sym =
250 SymMgr.getMetadataSymbol(region, expr, type, LCtx, count, symbolTag);
251
252 if (Loc::isLocType(type))
254
255 return nonloc::SymbolVal(sym);
256}
257
260 const TypedValueRegion *region) {
261 QualType T = region->getValueType();
262
263 if (T->isNullPtrType())
264 return makeZeroVal(T);
265
267 return UnknownVal();
268
269 SymbolRef sym = SymMgr.getDerivedSymbol(parentSymbol, region);
270
271 if (Loc::isLocType(T))
273
274 return nonloc::SymbolVal(sym);
275}
276
278 assert(!ND || (isa<CXXMethodDecl, FieldDecl, IndirectFieldDecl>(ND)));
279
280 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(ND)) {
281 // Sema treats pointers to static member functions as have function pointer
282 // type, so return a function pointer for the method.
283 // We don't need to play a similar trick for static member fields
284 // because these are represented as plain VarDecls and not FieldDecls
285 // in the AST.
286 if (!MD->isImplicitObjectMemberFunction())
287 return getFunctionPointer(MD);
288 }
289
290 return nonloc::PointerToMember(ND);
291}
292
295}
296
298 CanQualType locTy,
299 const LocationContext *locContext,
300 unsigned blockCount) {
301 const BlockCodeRegion *BC =
302 MemMgr.getBlockCodeRegion(block, locTy, locContext->getAnalysisDeclContext());
303 const BlockDataRegion *BD = MemMgr.getBlockDataRegion(BC, locContext,
304 blockCount);
305 return loc::MemRegionVal(BD);
306}
307
308std::optional<loc::MemRegionVal>
310 if (auto OptR = StateMgr.getStoreManager().castRegion(R, Ty))
311 return loc::MemRegionVal(*OptR);
312 return std::nullopt;
313}
314
315/// Return a memory region for the 'this' object reference.
317 const StackFrameContext *SFC) {
318 return loc::MemRegionVal(
319 getRegionManager().getCXXThisRegion(D->getThisType(), SFC));
320}
321
322/// Return a memory region for the 'this' object reference.
324 const StackFrameContext *SFC) {
325 const Type *T = D->getTypeForDecl();
327 return loc::MemRegionVal(getRegionManager().getCXXThisRegion(PT, SFC));
328}
329
330std::optional<SVal> SValBuilder::getConstantVal(const Expr *E) {
331 E = E->IgnoreParens();
332
333 switch (E->getStmtClass()) {
334 // Handle expressions that we treat differently from the AST's constant
335 // evaluator.
336 case Stmt::AddrLabelExprClass:
337 return makeLoc(cast<AddrLabelExpr>(E));
338
339 case Stmt::CXXScalarValueInitExprClass:
340 case Stmt::ImplicitValueInitExprClass:
341 return makeZeroVal(E->getType());
342
343 case Stmt::ObjCStringLiteralClass: {
344 const auto *SL = cast<ObjCStringLiteral>(E);
345 return makeLoc(getRegionManager().getObjCStringRegion(SL));
346 }
347
348 case Stmt::StringLiteralClass: {
349 const auto *SL = cast<StringLiteral>(E);
350 return makeLoc(getRegionManager().getStringRegion(SL));
351 }
352
353 case Stmt::PredefinedExprClass: {
354 const auto *PE = cast<PredefinedExpr>(E);
355 assert(PE->getFunctionName() &&
356 "Since we analyze only instantiated functions, PredefinedExpr "
357 "should have a function name.");
358 return makeLoc(getRegionManager().getStringRegion(PE->getFunctionName()));
359 }
360
361 // Fast-path some expressions to avoid the overhead of going through the AST's
362 // constant evaluator
363 case Stmt::CharacterLiteralClass: {
364 const auto *C = cast<CharacterLiteral>(E);
365 return makeIntVal(C->getValue(), C->getType());
366 }
367
368 case Stmt::CXXBoolLiteralExprClass:
369 return makeBoolVal(cast<CXXBoolLiteralExpr>(E));
370
371 case Stmt::TypeTraitExprClass: {
372 const auto *TE = cast<TypeTraitExpr>(E);
373 return makeTruthVal(TE->getValue(), TE->getType());
374 }
375
376 case Stmt::IntegerLiteralClass:
377 return makeIntVal(cast<IntegerLiteral>(E));
378
379 case Stmt::ObjCBoolLiteralExprClass:
380 return makeBoolVal(cast<ObjCBoolLiteralExpr>(E));
381
382 case Stmt::CXXNullPtrLiteralExprClass:
383 return makeNullWithType(E->getType());
384
385 case Stmt::CStyleCastExprClass:
386 case Stmt::CXXFunctionalCastExprClass:
387 case Stmt::CXXConstCastExprClass:
388 case Stmt::CXXReinterpretCastExprClass:
389 case Stmt::CXXStaticCastExprClass:
390 case Stmt::ImplicitCastExprClass: {
391 const auto *CE = cast<CastExpr>(E);
392 switch (CE->getCastKind()) {
393 default:
394 break;
395 case CK_ArrayToPointerDecay:
396 case CK_IntegralToPointer:
397 case CK_NoOp:
398 case CK_BitCast: {
399 const Expr *SE = CE->getSubExpr();
400 std::optional<SVal> Val = getConstantVal(SE);
401 if (!Val)
402 return std::nullopt;
403 return evalCast(*Val, CE->getType(), SE->getType());
404 }
405 }
406 [[fallthrough]];
407 }
408
409 // If we don't have a special case, fall back to the AST's constant evaluator.
410 default: {
411 // Don't try to come up with a value for materialized temporaries.
412 if (E->isGLValue())
413 return std::nullopt;
414
415 ASTContext &Ctx = getContext();
417 if (E->EvaluateAsInt(Result, Ctx))
418 return makeIntVal(Result.Val.getInt());
419
420 if (Loc::isLocType(E->getType()))
422 return makeNullWithType(E->getType());
423
424 return std::nullopt;
425 }
426 }
427}
428
430 NonLoc LHS, NonLoc RHS,
431 QualType ResultTy) {
432 SymbolRef symLHS = LHS.getAsSymbol();
433 SymbolRef symRHS = RHS.getAsSymbol();
434
435 // TODO: When the Max Complexity is reached, we should conjure a symbol
436 // instead of generating an Unknown value and propagate the taint info to it.
437 const unsigned MaxComp = AnOpts.MaxSymbolComplexity;
438
439 if (symLHS && symRHS &&
440 (symLHS->computeComplexity() + symRHS->computeComplexity()) < MaxComp)
441 return makeNonLoc(symLHS, Op, symRHS, ResultTy);
442
443 if (symLHS && symLHS->computeComplexity() < MaxComp)
444 if (std::optional<nonloc::ConcreteInt> rInt =
446 return makeNonLoc(symLHS, Op, rInt->getValue(), ResultTy);
447
448 if (symRHS && symRHS->computeComplexity() < MaxComp)
449 if (std::optional<nonloc::ConcreteInt> lInt =
451 return makeNonLoc(lInt->getValue(), Op, symRHS, ResultTy);
452
453 return UnknownVal();
454}
455
457 switch (X.getKind()) {
458 case nonloc::ConcreteIntKind:
459 return makeIntVal(-X.castAs<nonloc::ConcreteInt>().getValue());
460 case nonloc::SymbolValKind:
461 return makeNonLoc(X.castAs<nonloc::SymbolVal>().getSymbol(), UO_Minus,
462 X.getType(Context));
463 default:
464 return UnknownVal();
465 }
466}
467
469 switch (X.getKind()) {
470 case nonloc::ConcreteIntKind:
471 return makeIntVal(~X.castAs<nonloc::ConcreteInt>().getValue());
472 case nonloc::SymbolValKind:
473 return makeNonLoc(X.castAs<nonloc::SymbolVal>().getSymbol(), UO_Not,
474 X.getType(Context));
475 default:
476 return UnknownVal();
477 }
478}
479
481 SVal operand, QualType type) {
482 auto OpN = operand.getAs<NonLoc>();
483 if (!OpN)
484 return UnknownVal();
485
486 if (opc == UO_Minus)
487 return evalMinus(*OpN);
488 if (opc == UO_Not)
489 return evalComplement(*OpN);
490 llvm_unreachable("Unexpected unary operator");
491}
492
494 SVal lhs, SVal rhs, QualType type) {
495 if (lhs.isUndef() || rhs.isUndef())
496 return UndefinedVal();
497
498 if (lhs.isUnknown() || rhs.isUnknown())
499 return UnknownVal();
500
501 if (isa<nonloc::LazyCompoundVal>(lhs) || isa<nonloc::LazyCompoundVal>(rhs)) {
502 return UnknownVal();
503 }
504
505 if (op == BinaryOperatorKind::BO_Cmp) {
506 // We can't reason about C++20 spaceship operator yet.
507 //
508 // FIXME: Support C++20 spaceship operator.
509 // The main problem here is that the result is not integer.
510 return UnknownVal();
511 }
512
513 if (std::optional<Loc> LV = lhs.getAs<Loc>()) {
514 if (std::optional<Loc> RV = rhs.getAs<Loc>())
515 return evalBinOpLL(state, op, *LV, *RV, type);
516
517 return evalBinOpLN(state, op, *LV, rhs.castAs<NonLoc>(), type);
518 }
519
520 if (const std::optional<Loc> RV = rhs.getAs<Loc>()) {
521 const auto IsCommutative = [](BinaryOperatorKind Op) {
522 return Op == BO_Mul || Op == BO_Add || Op == BO_And || Op == BO_Xor ||
523 Op == BO_Or;
524 };
525
526 if (IsCommutative(op)) {
527 // Swap operands.
528 return evalBinOpLN(state, op, *RV, lhs.castAs<NonLoc>(), type);
529 }
530
531 // If the right operand is a concrete int location then we have nothing
532 // better but to treat it as a simple nonloc.
533 if (auto RV = rhs.getAs<loc::ConcreteInt>()) {
534 const nonloc::ConcreteInt RhsAsLoc = makeIntVal(RV->getValue());
535 return evalBinOpNN(state, op, lhs.castAs<NonLoc>(), RhsAsLoc, type);
536 }
537 }
538
539 return evalBinOpNN(state, op, lhs.castAs<NonLoc>(), rhs.castAs<NonLoc>(),
540 type);
541}
542
544 SVal rhs) {
545 return state->isNonNull(evalEQ(state, lhs, rhs));
546}
547
549 return evalBinOp(state, BO_EQ, lhs, rhs, getConditionType());
550}
551
555 return evalEQ(state, static_cast<SVal>(lhs), static_cast<SVal>(rhs))
557}
558
559/// Recursively check if the pointer types are equal modulo const, volatile,
560/// and restrict qualifiers. Also, assume that all types are similar to 'void'.
561/// Assumes the input types are canonical.
562static bool shouldBeModeledWithNoOp(ASTContext &Context, QualType ToTy,
563 QualType FromTy) {
564 while (Context.UnwrapSimilarTypes(ToTy, FromTy)) {
565 Qualifiers Quals1, Quals2;
566 ToTy = Context.getUnqualifiedArrayType(ToTy, Quals1);
567 FromTy = Context.getUnqualifiedArrayType(FromTy, Quals2);
568
569 // Make sure that non-cvr-qualifiers the other qualifiers (e.g., address
570 // spaces) are identical.
571 Quals1.removeCVRQualifiers();
572 Quals2.removeCVRQualifiers();
573 if (Quals1 != Quals2)
574 return false;
575 }
576
577 // If we are casting to void, the 'From' value can be used to represent the
578 // 'To' value.
579 //
580 // FIXME: Doing this after unwrapping the types doesn't make any sense. A
581 // cast from 'int**' to 'void**' is not special in the way that a cast from
582 // 'int*' to 'void*' is.
583 if (ToTy->isVoidType())
584 return true;
585
586 if (ToTy != FromTy)
587 return false;
588
589 return true;
590}
591
592// Handles casts of type CK_IntegralCast.
593// At the moment, this function will redirect to evalCast, except when the range
594// of the original value is known to be greater than the max of the target type.
596 QualType castTy, QualType originalTy) {
597 // No truncations if target type is big enough.
598 if (getContext().getTypeSize(castTy) >= getContext().getTypeSize(originalTy))
599 return evalCast(val, castTy, originalTy);
600
601 SymbolRef se = val.getAsSymbol();
602 if (!se) // Let evalCast handle non symbolic expressions.
603 return evalCast(val, castTy, originalTy);
604
605 // Find the maximum value of the target type.
606 APSIntType ToType(getContext().getTypeSize(castTy),
607 castTy->isUnsignedIntegerType());
608 llvm::APSInt ToTypeMax = ToType.getMaxValue();
609
610 NonLoc ToTypeMaxVal = makeIntVal(ToTypeMax);
611
612 // Check the range of the symbol being casted against the maximum value of the
613 // target type.
614 NonLoc FromVal = val.castAs<NonLoc>();
615 QualType CmpTy = getConditionType();
616 NonLoc CompVal =
617 evalBinOpNN(state, BO_LE, FromVal, ToTypeMaxVal, CmpTy).castAs<NonLoc>();
618 ProgramStateRef IsNotTruncated, IsTruncated;
619 std::tie(IsNotTruncated, IsTruncated) = state->assume(CompVal);
620 if (!IsNotTruncated && IsTruncated) {
621 // Symbol is truncated so we evaluate it as a cast.
622 return makeNonLoc(se, originalTy, castTy);
623 }
624 return evalCast(val, castTy, originalTy);
625}
626
627//===----------------------------------------------------------------------===//
628// Cast method.
629// `evalCast` and its helper `EvalCastVisitor`
630//===----------------------------------------------------------------------===//
631
632namespace {
633class EvalCastVisitor : public SValVisitor<EvalCastVisitor, SVal> {
634private:
635 SValBuilder &VB;
636 ASTContext &Context;
637 QualType CastTy, OriginalTy;
638
639public:
640 EvalCastVisitor(SValBuilder &VB, QualType CastTy, QualType OriginalTy)
641 : VB(VB), Context(VB.getContext()), CastTy(CastTy),
642 OriginalTy(OriginalTy) {}
643
644 SVal Visit(SVal V) {
645 if (CastTy.isNull())
646 return V;
647
648 CastTy = Context.getCanonicalType(CastTy);
649
650 const bool IsUnknownOriginalType = OriginalTy.isNull();
651 if (!IsUnknownOriginalType) {
652 OriginalTy = Context.getCanonicalType(OriginalTy);
653
654 if (CastTy == OriginalTy)
655 return V;
656
657 // FIXME: Move this check to the most appropriate
658 // evalCastKind/evalCastSubKind function. For const casts, casts to void,
659 // just propagate the value.
660 if (!CastTy->isVariableArrayType() && !OriginalTy->isVariableArrayType())
661 if (shouldBeModeledWithNoOp(Context, Context.getPointerType(CastTy),
662 Context.getPointerType(OriginalTy)))
663 return V;
664 }
665 return SValVisitor::Visit(V);
666 }
667 SVal VisitUndefinedVal(UndefinedVal V) { return V; }
668 SVal VisitUnknownVal(UnknownVal V) { return V; }
669 SVal VisitConcreteInt(loc::ConcreteInt V) {
670 // Pointer to bool.
671 if (CastTy->isBooleanType())
672 return VB.makeTruthVal(V.getValue().getBoolValue(), CastTy);
673
674 // Pointer to integer.
675 if (CastTy->isIntegralOrEnumerationType()) {
676 llvm::APSInt Value = V.getValue();
678 return VB.makeIntVal(Value);
679 }
680
681 // Pointer to any pointer.
682 if (Loc::isLocType(CastTy)) {
683 llvm::APSInt Value = V.getValue();
685 return loc::ConcreteInt(VB.getBasicValueFactory().getValue(Value));
686 }
687
688 // Pointer to whatever else.
689 return UnknownVal();
690 }
691 SVal VisitGotoLabel(loc::GotoLabel V) {
692 // Pointer to bool.
693 if (CastTy->isBooleanType())
694 // Labels are always true.
695 return VB.makeTruthVal(true, CastTy);
696
697 // Pointer to integer.
698 if (CastTy->isIntegralOrEnumerationType()) {
699 const unsigned BitWidth = Context.getIntWidth(CastTy);
700 return VB.makeLocAsInteger(V, BitWidth);
701 }
702
703 const bool IsUnknownOriginalType = OriginalTy.isNull();
704 if (!IsUnknownOriginalType) {
705 // Array to pointer.
706 if (isa<ArrayType>(OriginalTy))
707 if (CastTy->isPointerType() || CastTy->isReferenceType())
708 return UnknownVal();
709 }
710
711 // Pointer to any pointer.
712 if (Loc::isLocType(CastTy))
713 return V;
714
715 // Pointer to whatever else.
716 return UnknownVal();
717 }
718 SVal VisitMemRegionVal(loc::MemRegionVal V) {
719 // Pointer to bool.
720 if (CastTy->isBooleanType()) {
721 const MemRegion *R = V.getRegion();
722 if (const FunctionCodeRegion *FTR = dyn_cast<FunctionCodeRegion>(R))
723 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(FTR->getDecl()))
724 if (FD->isWeak())
725 // FIXME: Currently we are using an extent symbol here,
726 // because there are no generic region address metadata
727 // symbols to use, only content metadata.
728 return nonloc::SymbolVal(
730
731 if (const SymbolicRegion *SymR = R->getSymbolicBase()) {
732 SymbolRef Sym = SymR->getSymbol();
733 QualType Ty = Sym->getType();
734 // This change is needed for architectures with varying
735 // pointer widths. See the amdgcn opencl reproducer with
736 // this change as an example: solver-sym-simplification-ptr-bool.cl
737 if (!Ty->isReferenceType())
738 return VB.makeNonLoc(
739 Sym, BO_NE, VB.getBasicValueFactory().getZeroWithTypeSize(Ty),
740 CastTy);
741 }
742 // Non-symbolic memory regions are always true.
743 return VB.makeTruthVal(true, CastTy);
744 }
745
746 const bool IsUnknownOriginalType = OriginalTy.isNull();
747 // Try to cast to array
748 const auto *ArrayTy =
749 IsUnknownOriginalType
750 ? nullptr
751 : dyn_cast<ArrayType>(OriginalTy.getCanonicalType());
752
753 // Pointer to integer.
754 if (CastTy->isIntegralOrEnumerationType()) {
755 SVal Val = V;
756 // Array to integer.
757 if (ArrayTy) {
758 // We will always decay to a pointer.
759 QualType ElemTy = ArrayTy->getElementType();
760 Val = VB.getStateManager().ArrayToPointer(V, ElemTy);
761 // FIXME: Keep these here for now in case we decide soon that we
762 // need the original decayed type.
763 // QualType elemTy = cast<ArrayType>(originalTy)->getElementType();
764 // QualType pointerTy = C.getPointerType(elemTy);
765 }
766 const unsigned BitWidth = Context.getIntWidth(CastTy);
767 return VB.makeLocAsInteger(Val.castAs<Loc>(), BitWidth);
768 }
769
770 // Pointer to pointer.
771 if (Loc::isLocType(CastTy)) {
772
773 if (IsUnknownOriginalType) {
774 // When retrieving symbolic pointer and expecting a non-void pointer,
775 // wrap them into element regions of the expected type if necessary.
776 // It is necessary to make sure that the retrieved value makes sense,
777 // because there's no other cast in the AST that would tell us to cast
778 // it to the correct pointer type. We might need to do that for non-void
779 // pointers as well.
780 // FIXME: We really need a single good function to perform casts for us
781 // correctly every time we need it.
782 const MemRegion *R = V.getRegion();
783 if (CastTy->isPointerType() && !CastTy->isVoidPointerType()) {
784 if (const auto *SR = dyn_cast<SymbolicRegion>(R)) {
785 QualType SRTy = SR->getSymbol()->getType();
786
787 auto HasSameUnqualifiedPointeeType = [](QualType ty1,
788 QualType ty2) {
789 return ty1->getPointeeType().getCanonicalType().getTypePtr() ==
791 };
792 if (!HasSameUnqualifiedPointeeType(SRTy, CastTy)) {
793 if (auto OptMemRegV = VB.getCastedMemRegionVal(SR, CastTy))
794 return *OptMemRegV;
795 }
796 }
797 }
798 // Next fixes pointer dereference using type different from its initial
799 // one. See PR37503 and PR49007 for details.
800 if (const auto *ER = dyn_cast<ElementRegion>(R)) {
801 if (auto OptMemRegV = VB.getCastedMemRegionVal(ER, CastTy))
802 return *OptMemRegV;
803 }
804
805 return V;
806 }
807
808 if (OriginalTy->isIntegralOrEnumerationType() ||
809 OriginalTy->isBlockPointerType() ||
810 OriginalTy->isFunctionPointerType())
811 return V;
812
813 // Array to pointer.
814 if (ArrayTy) {
815 // Are we casting from an array to a pointer? If so just pass on
816 // the decayed value.
817 if (CastTy->isPointerType() || CastTy->isReferenceType()) {
818 // We will always decay to a pointer.
819 QualType ElemTy = ArrayTy->getElementType();
820 return VB.getStateManager().ArrayToPointer(V, ElemTy);
821 }
822 // Are we casting from an array to an integer? If so, cast the decayed
823 // pointer value to an integer.
824 assert(CastTy->isIntegralOrEnumerationType());
825 }
826
827 // Other pointer to pointer.
828 assert(Loc::isLocType(OriginalTy) || OriginalTy->isFunctionType() ||
829 CastTy->isReferenceType());
830
831 // We get a symbolic function pointer for a dereference of a function
832 // pointer, but it is of function type. Example:
833
834 // struct FPRec {
835 // void (*my_func)(int * x);
836 // };
837 //
838 // int bar(int x);
839 //
840 // int f1_a(struct FPRec* foo) {
841 // int x;
842 // (*foo->my_func)(&x);
843 // return bar(x)+1; // no-warning
844 // }
845
846 // Get the result of casting a region to a different type.
847 const MemRegion *R = V.getRegion();
848 if (auto OptMemRegV = VB.getCastedMemRegionVal(R, CastTy))
849 return *OptMemRegV;
850 }
851
852 // Pointer to whatever else.
853 // FIXME: There can be gross cases where one casts the result of a
854 // function (that returns a pointer) to some other value that happens to
855 // fit within that pointer value. We currently have no good way to model
856 // such operations. When this happens, the underlying operation is that
857 // the caller is reasoning about bits. Conceptually we are layering a
858 // "view" of a location on top of those bits. Perhaps we need to be more
859 // lazy about mutual possible views, even on an SVal? This may be
860 // necessary for bit-level reasoning as well.
861 return UnknownVal();
862 }
863 SVal VisitCompoundVal(nonloc::CompoundVal V) {
864 // Compound to whatever.
865 return UnknownVal();
866 }
867 SVal VisitConcreteInt(nonloc::ConcreteInt V) {
868 auto CastedValue = [V, this]() {
869 llvm::APSInt Value = V.getValue();
871 return Value;
872 };
873
874 // Integer to bool.
875 if (CastTy->isBooleanType())
876 return VB.makeTruthVal(V.getValue().getBoolValue(), CastTy);
877
878 // Integer to pointer.
879 if (CastTy->isIntegralOrEnumerationType())
880 return VB.makeIntVal(CastedValue());
881
882 // Integer to pointer.
883 if (Loc::isLocType(CastTy))
884 return VB.makeIntLocVal(CastedValue());
885
886 // Pointer to whatever else.
887 return UnknownVal();
888 }
889 SVal VisitLazyCompoundVal(nonloc::LazyCompoundVal V) {
890 // LazyCompound to whatever.
891 return UnknownVal();
892 }
893 SVal VisitLocAsInteger(nonloc::LocAsInteger V) {
894 Loc L = V.getLoc();
895
896 // Pointer as integer to bool.
897 if (CastTy->isBooleanType())
898 // Pass to Loc function.
899 return Visit(L);
900
901 const bool IsUnknownOriginalType = OriginalTy.isNull();
902 // Pointer as integer to pointer.
903 if (!IsUnknownOriginalType && Loc::isLocType(CastTy) &&
904 OriginalTy->isIntegralOrEnumerationType()) {
905 if (const MemRegion *R = L.getAsRegion())
906 if (auto OptMemRegV = VB.getCastedMemRegionVal(R, CastTy))
907 return *OptMemRegV;
908 return L;
909 }
910
911 // Pointer as integer with region to integer/pointer.
912 const MemRegion *R = L.getAsRegion();
913 if (!IsUnknownOriginalType && R) {
914 if (CastTy->isIntegralOrEnumerationType())
915 return VisitMemRegionVal(loc::MemRegionVal(R));
916
917 if (Loc::isLocType(CastTy)) {
918 assert(Loc::isLocType(OriginalTy) || OriginalTy->isFunctionType() ||
919 CastTy->isReferenceType());
920 // Delegate to store manager to get the result of casting a region to a
921 // different type. If the MemRegion* returned is NULL, this expression
922 // Evaluates to UnknownVal.
923 if (auto OptMemRegV = VB.getCastedMemRegionVal(R, CastTy))
924 return *OptMemRegV;
925 }
926 } else {
927 if (Loc::isLocType(CastTy)) {
928 if (IsUnknownOriginalType)
929 return VisitMemRegionVal(loc::MemRegionVal(R));
930 return L;
931 }
932
933 SymbolRef SE = nullptr;
934 if (R) {
935 if (const SymbolicRegion *SR =
936 dyn_cast<SymbolicRegion>(R->StripCasts())) {
937 SE = SR->getSymbol();
938 }
939 }
940
941 if (!CastTy->isFloatingType() || !SE || SE->getType()->isFloatingType()) {
942 // FIXME: Correctly support promotions/truncations.
943 const unsigned CastSize = Context.getIntWidth(CastTy);
944 if (CastSize == V.getNumBits())
945 return V;
946
947 return VB.makeLocAsInteger(L, CastSize);
948 }
949 }
950
951 // Pointer as integer to whatever else.
952 return UnknownVal();
953 }
954 SVal VisitSymbolVal(nonloc::SymbolVal V) {
955 SymbolRef SE = V.getSymbol();
956
957 const bool IsUnknownOriginalType = OriginalTy.isNull();
958 // Symbol to bool.
959 if (!IsUnknownOriginalType && CastTy->isBooleanType()) {
960 // Non-float to bool.
961 if (Loc::isLocType(OriginalTy) ||
962 OriginalTy->isIntegralOrEnumerationType() ||
963 OriginalTy->isMemberPointerType()) {
965 return VB.makeNonLoc(SE, BO_NE, BVF.getValue(0, SE->getType()), CastTy);
966 }
967 } else {
968 // Symbol to integer, float.
969 QualType T = Context.getCanonicalType(SE->getType());
970
971 // Produce SymbolCast if CastTy and T are different integers.
972 // NOTE: In the end the type of SymbolCast shall be equal to CastTy.
979 // If appropriate option is disabled, ignore the cast.
980 // NOTE: ShouldSupportSymbolicIntegerCasts is `false` by default.
981 if (!Opts.ShouldSupportSymbolicIntegerCasts)
982 return V;
983 return simplifySymbolCast(V, CastTy);
984 }
985 if (!Loc::isLocType(CastTy))
986 if (!IsUnknownOriginalType || !CastTy->isFloatingType() ||
987 T->isFloatingType())
988 return VB.makeNonLoc(SE, T, CastTy);
989 }
990
991 // FIXME: We should be able to cast NonLoc -> Loc
992 // (when Loc::isLocType(CastTy) is true)
993 // But it's hard to do as SymbolicRegions can't refer to SymbolCasts holding
994 // generic SymExprs. Check the commit message for the details.
995
996 // Symbol to pointer and whatever else.
997 return UnknownVal();
998 }
999 SVal VisitPointerToMember(nonloc::PointerToMember V) {
1000 // Member pointer to whatever.
1001 return V;
1002 }
1003
1004 /// Reduce cast expression by removing redundant intermediate casts.
1005 /// E.g.
1006 /// - (char)(short)(int x) -> (char)(int x)
1007 /// - (int)(int x) -> int x
1008 ///
1009 /// \param V -- SymbolVal, which pressumably contains SymbolCast or any symbol
1010 /// that is applicable for cast operation.
1011 /// \param CastTy -- QualType, which `V` shall be cast to.
1012 /// \return SVal with simplified cast expression.
1013 /// \note: Currently only support integral casts.
1014 nonloc::SymbolVal simplifySymbolCast(nonloc::SymbolVal V, QualType CastTy) {
1015 // We use seven conditions to recognize a simplification case.
1016 // For the clarity let `CastTy` be `C`, SE->getType() - `T`, root type -
1017 // `R`, prefix `u` for unsigned, `s` for signed, no prefix - any sign: E.g.
1018 // (char)(short)(uint x)
1019 // ( sC )( sT )( uR x)
1020 //
1021 // C === R (the same type)
1022 // (char)(char x) -> (char x)
1023 // (long)(long x) -> (long x)
1024 // Note: Comparisons operators below are for bit width.
1025 // C == T
1026 // (short)(short)(int x) -> (short)(int x)
1027 // (int)(long)(char x) -> (int)(char x) (sizeof(long) == sizeof(int))
1028 // (long)(ullong)(char x) -> (long)(char x) (sizeof(long) ==
1029 // sizeof(ullong))
1030 // C < T
1031 // (short)(int)(char x) -> (short)(char x)
1032 // (char)(int)(short x) -> (char)(short x)
1033 // (short)(int)(short x) -> (short x)
1034 // C > T > uR
1035 // (int)(short)(uchar x) -> (int)(uchar x)
1036 // (uint)(short)(uchar x) -> (uint)(uchar x)
1037 // (int)(ushort)(uchar x) -> (int)(uchar x)
1038 // C > sT > sR
1039 // (int)(short)(char x) -> (int)(char x)
1040 // (uint)(short)(char x) -> (uint)(char x)
1041 // C > sT == sR
1042 // (int)(char)(char x) -> (int)(char x)
1043 // (uint)(short)(short x) -> (uint)(short x)
1044 // C > uT == uR
1045 // (int)(uchar)(uchar x) -> (int)(uchar x)
1046 // (uint)(ushort)(ushort x) -> (uint)(ushort x)
1047 // (llong)(ulong)(uint x) -> (llong)(uint x) (sizeof(ulong) ==
1048 // sizeof(uint))
1049
1050 SymbolRef SE = V.getSymbol();
1051 QualType T = Context.getCanonicalType(SE->getType());
1052
1053 if (T == CastTy)
1054 return V;
1055
1056 if (!isa<SymbolCast>(SE))
1057 return VB.makeNonLoc(SE, T, CastTy);
1058
1059 SymbolRef RootSym = cast<SymbolCast>(SE)->getOperand();
1060 QualType RT = RootSym->getType().getCanonicalType();
1061
1062 // FIXME support simplification from non-integers.
1063 if (!RT->isIntegralOrEnumerationType())
1064 return VB.makeNonLoc(SE, T, CastTy);
1065
1067 APSIntType CTy = BVF.getAPSIntType(CastTy);
1068 APSIntType TTy = BVF.getAPSIntType(T);
1069
1070 const auto WC = CTy.getBitWidth();
1071 const auto WT = TTy.getBitWidth();
1072
1073 if (WC <= WT) {
1074 const bool isSameType = (RT == CastTy);
1075 if (isSameType)
1076 return nonloc::SymbolVal(RootSym);
1077 return VB.makeNonLoc(RootSym, RT, CastTy);
1078 }
1079
1080 APSIntType RTy = BVF.getAPSIntType(RT);
1081 const auto WR = RTy.getBitWidth();
1082 const bool UT = TTy.isUnsigned();
1083 const bool UR = RTy.isUnsigned();
1084
1085 if (((WT > WR) && (UR || !UT)) || ((WT == WR) && (UT == UR)))
1086 return VB.makeNonLoc(RootSym, RT, CastTy);
1087
1088 return VB.makeNonLoc(SE, T, CastTy);
1089 }
1090};
1091} // end anonymous namespace
1092
1093/// Cast a given SVal to another SVal using given QualType's.
1094/// \param V -- SVal that should be casted.
1095/// \param CastTy -- QualType that V should be casted according to.
1096/// \param OriginalTy -- QualType which is associated to V. It provides
1097/// additional information about what type the cast performs from.
1098/// \returns the most appropriate casted SVal.
1099/// Note: Many cases don't use an exact OriginalTy. It can be extracted
1100/// from SVal or the cast can performs unconditionaly. Always pass OriginalTy!
1101/// It can be crucial in certain cases and generates different results.
1102/// FIXME: If `OriginalTy.isNull()` is true, then cast performs based on CastTy
1103/// only. This behavior is uncertain and should be improved.
1105 EvalCastVisitor TRV{*this, CastTy, OriginalTy};
1106 return TRV.Visit(V);
1107}
Defines the clang::ASTContext interface.
#define V(N, I)
Definition: ASTContext.h:3273
This file defines AnalysisDeclContext, a class that manages the analysis context data for context sen...
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate....
Defines the clang::Expr interface and subclasses for C++ expressions.
#define X(type, name)
Definition: Value.h:143
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified.
llvm::DenseMap< const CFGBlock *, unsigned > VisitCount
Definition: Logger.cpp:30
static bool shouldBeModeledWithNoOp(ASTContext &Context, QualType ToTy, QualType FromTy)
Recursively check if the pointer types are equal modulo const, volatile, and restrict qualifiers.
C Language Family Type Representation.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:182
unsigned getIntWidth(QualType T) const
CanQualType getCanonicalType(QualType T) const
Return the canonical (structural) type corresponding to the specified potentially non-canonical type ...
Definition: ASTContext.h:2563
QualType getPointerType(QualType T) const
Return the uniqued reference to the type for a pointer to the specified type.
QualType getUnqualifiedArrayType(QualType T, Qualifiers &Quals)
Return this type as a completely-unqualified array type, capturing the qualifiers in Quals.
bool UnwrapSimilarTypes(QualType &T1, QualType &T2, bool AllowPiMismatch=true)
Attempt to unwrap two types that may be similar (C++ [conv.qual]).
ASTContext & getASTContext() const
Stores options for the analyzer from the command line.
Represents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:4495
A boolean literal, per ([C++ lex.bool] Boolean literals).
Definition: ExprCXX.h:720
bool getValue() const
Definition: ExprCXX.h:737
Represents a static or instance method of a struct/union/class.
Definition: DeclCXX.h:2057
QualType getThisType() const
Return the type of the this pointer.
Definition: DeclCXX.cpp:2563
Represents a C++ struct/union/class.
Definition: DeclCXX.h:258
This represents one expression.
Definition: Expr.h:110
bool EvaluateAsInt(EvalResult &Result, const ASTContext &Ctx, SideEffectsKind AllowSideEffects=SE_NoSideEffects, bool InConstantContext=false) const
EvaluateAsInt - Return true if this is a constant which we can fold and convert to an integer,...
bool isGLValue() const
Definition: Expr.h:280
Expr * IgnoreParens() LLVM_READONLY
Skip past any parentheses which might surround this expression until reaching a fixed point.
Definition: Expr.cpp:3055
@ NPC_ValueDependentIsNotNull
Specifies that a value-dependent expression should be considered to never be a null pointer constant.
Definition: Expr.h:825
NullPointerConstantKind isNullPointerConstant(ASTContext &Ctx, NullPointerConstantValueDependence NPC) const
isNullPointerConstant - C99 6.3.2.3p3 - Test if this reduces down to a Null pointer constant.
Definition: Expr.cpp:3918
QualType getType() const
Definition: Expr.h:142
Represents a function declaration or definition.
Definition: Decl.h:1971
It wraps the AnalysisDeclContext to represent both the call stack with the help of StackFrameContext ...
LLVM_ATTRIBUTE_RETURNS_NONNULL AnalysisDeclContext * getAnalysisDeclContext() const
This represents a decl that may have a name.
Definition: Decl.h:249
A (possibly-)qualified type.
Definition: Type.h:738
bool isNull() const
Return true if this QualType doesn't point to a type yet.
Definition: Type.h:805
const Type * getTypePtr() const
Retrieves a pointer to the underlying (unqualified) type.
Definition: Type.h:7149
QualType getCanonicalType() const
Definition: Type.h:7201
The collection of all-type qualifiers we support.
Definition: Type.h:148
void removeCVRQualifiers(unsigned mask)
Definition: Type.h:303
It represents a stack frame of the call stack (based on CallEvent).
Stmt - This represents one statement.
Definition: Stmt.h:84
StmtClass getStmtClass() const
Definition: Stmt.h:1363
const Type * getTypeForDecl() const
Definition: Decl.h:3415
The base class of the type hierarchy.
Definition: Type.h:1607
bool isBlockPointerType() const
Definition: Type.h:7410
bool isVoidType() const
Definition: Type.h:7695
bool isBooleanType() const
Definition: Type.h:7823
bool isIntegralOrUnscopedEnumerationType() const
Determine whether this type is an integral or unscoped enumeration type.
Definition: Type.cpp:2059
bool isVoidPointerType() const
Definition: Type.cpp:654
bool isFunctionPointerType() const
Definition: Type.h:7436
bool isPointerType() const
Definition: Type.h:7402
bool isReferenceType() const
Definition: Type.h:7414
bool isVariableArrayType() const
Definition: Type.h:7480
QualType getPointeeType() const
If this is a pointer, ObjC object pointer, or block pointer, this returns the respective pointee.
Definition: Type.cpp:694
bool isIntegralOrEnumerationType() const
Determine whether this type is an integral or enumeration type.
Definition: Type.h:7810
bool isMemberPointerType() const
Definition: Type.h:7450
bool isFunctionType() const
Definition: Type.h:7398
bool isFloatingType() const
Definition: Type.cpp:2237
bool isUnsignedIntegerType() const
Return true if this is an integer type that is unsigned, according to C99 6.2.5p6 [which returns true...
Definition: Type.cpp:2184
bool isNullPtrType() const
Definition: Type.h:7728
A record of the "type" of an APSInt, used for conversions.
Definition: APSIntType.h:19
bool isUnsigned() const
Definition: APSIntType.h:31
uint32_t getBitWidth() const
Definition: APSIntType.h:30
llvm::APSInt getMaxValue() const LLVM_READONLY
Returns the maximum value for this type.
Definition: APSIntType.h:65
void apply(llvm::APSInt &Value) const
Convert a given APSInt, in place, to match this type.
Definition: APSIntType.h:37
AllocaRegion - A region that represents an untyped blob of bytes created by a call to 'alloca'.
Definition: MemRegion.h:473
AnalyzerOptions & getAnalyzerOptions() override
APSIntType getAPSIntType(QualType T) const
Returns the type of the APSInt used to store values of the given QualType.
llvm::ImmutableList< SVal > getEmptySValList()
const llvm::APSInt & getZeroWithTypeSize(QualType T)
BlockCodeRegion - A region that represents code texts of blocks (closures).
Definition: MemRegion.h:626
BlockDataRegion - A region that represents a block instance.
Definition: MemRegion.h:673
AnalysisManager & getAnalysisManager()
Definition: ExprEngine.h:198
FunctionCodeRegion - A region that represents code texts of function.
Definition: MemRegion.h:579
static bool isLocType(QualType T)
Definition: SVals.h:259
const BlockCodeRegion * getBlockCodeRegion(const BlockDecl *BD, CanQualType locTy, AnalysisDeclContext *AC)
Definition: MemRegion.cpp:1186
const AllocaRegion * getAllocaRegion(const Expr *Ex, unsigned Cnt, const LocationContext *LC)
getAllocaRegion - Retrieve a region associated with a call to alloca().
Definition: MemRegion.cpp:1310
const SymbolicRegion * getSymbolicHeapRegion(SymbolRef sym)
Return a unique symbolic region belonging to heap memory space.
Definition: MemRegion.cpp:1199
const SymbolicRegion * getSymbolicRegion(SymbolRef Sym, const MemSpaceRegion *MemSpace=nullptr)
Retrieve or create a "symbolic" memory region.
Definition: MemRegion.cpp:1192
const FunctionCodeRegion * getFunctionCodeRegion(const NamedDecl *FD)
Definition: MemRegion.cpp:1180
const BlockDataRegion * getBlockDataRegion(const BlockCodeRegion *bc, const LocationContext *lc, unsigned blockCount)
getBlockDataRegion - Get the memory region associated with an instance of a block.
Definition: MemRegion.cpp:1111
MemRegion - The root abstract class for all memory regions.
Definition: MemRegion.h:96
LLVM_ATTRIBUTE_RETURNS_NONNULL const MemRegion * StripCasts(bool StripBaseAndDerivedCasts=true) const
Definition: MemRegion.cpp:1378
const SymbolicRegion * getSymbolicBase() const
If this is a symbolic region, returns the region.
Definition: MemRegion.cpp:1401
SVal ArrayToPointer(Loc Array, QualType ElementTy)
Definition: ProgramState.h:592
DefinedOrUnknownSVal makeZeroVal(QualType type)
Construct an SVal representing '0' for the specified type.
Definition: SValBuilder.cpp:62
DefinedSVal getMemberPointer(const NamedDecl *ND)
SVal evalMinus(NonLoc val)
SVal evalComplement(NonLoc val)
BasicValueFactory & getBasicValueFactory()
Definition: SValBuilder.h:161
NonLoc makeCompoundVal(QualType type, llvm::ImmutableList< SVal > vals)
Definition: SValBuilder.h:262
SymbolManager SymMgr
Manages the creation of symbols.
Definition: SValBuilder.h:63
virtual SVal evalBinOpLN(ProgramStateRef state, BinaryOperator::Opcode op, Loc lhs, NonLoc rhs, QualType resultTy)=0
Create a new value which represents a binary expression with a memory location and non-location opera...
DefinedSVal getMetadataSymbolVal(const void *symbolTag, const MemRegion *region, const Expr *expr, QualType type, const LocationContext *LCtx, unsigned count)
MemRegionManager & getRegionManager()
Definition: SValBuilder.h:167
ProgramStateManager & getStateManager()
Definition: SValBuilder.h:151
SVal makeSymExprValNN(BinaryOperator::Opcode op, NonLoc lhs, NonLoc rhs, QualType resultTy)
Constructs a symbolic expression for two non-location values.
virtual SVal evalBinOpLL(ProgramStateRef state, BinaryOperator::Opcode op, Loc lhs, Loc rhs, QualType resultTy)=0
Create a new value which represents a binary expression with two memory location operands.
nonloc::SymbolVal makeNonLoc(const SymExpr *lhs, BinaryOperator::Opcode op, const llvm::APSInt &rhs, QualType type)
Definition: SValBuilder.cpp:77
const unsigned ArrayIndexWidth
The width of the scalar type used for array indices.
Definition: SValBuilder.h:76
DefinedSVal getBlockPointer(const BlockDecl *block, CanQualType locTy, const LocationContext *locContext, unsigned blockCount)
DefinedSVal getFunctionPointer(const FunctionDecl *func)
const QualType ArrayIndexTy
The scalar type to use for array indices.
Definition: SValBuilder.h:73
ASTContext & getContext()
Definition: SValBuilder.h:148
nonloc::ConcreteInt makeIntVal(const IntegerLiteral *integer)
Definition: SValBuilder.h:290
SVal convertToArrayIndex(SVal val)
loc::MemRegionVal makeLoc(SymbolRef sym)
Definition: SValBuilder.h:377
virtual SVal evalBinOpNN(ProgramStateRef state, BinaryOperator::Opcode op, NonLoc lhs, NonLoc rhs, QualType resultTy)=0
Create a new value which represents a binary expression with two non- location operands.
SVal evalCast(SVal V, QualType CastTy, QualType OriginalTy)
Cast a given SVal to another SVal using given QualType's.
DefinedOrUnknownSVal conjureSymbolVal(const void *symbolTag, const Expr *expr, const LocationContext *LCtx, unsigned count)
Create a new symbol with a unique 'name'.
BasicValueFactory BasicVals
Manager of APSInt values.
Definition: SValBuilder.h:60
ConditionTruthVal areEqual(ProgramStateRef state, SVal lhs, SVal rhs)
QualType getConditionType() const
Definition: SValBuilder.h:153
MemRegionManager MemMgr
Manages the creation of memory regions.
Definition: SValBuilder.h:66
SVal evalEQ(ProgramStateRef state, SVal lhs, SVal rhs)
SVal evalUnaryOp(ProgramStateRef state, UnaryOperator::Opcode opc, SVal operand, QualType type)
DefinedOrUnknownSVal getDerivedRegionValueSymbolVal(SymbolRef parentSymbol, const TypedValueRegion *region)
loc::MemRegionVal getCXXThis(const CXXMethodDecl *D, const StackFrameContext *SFC)
Return a memory region for the 'this' object reference.
nonloc::ConcreteInt makeTruthVal(bool b, QualType type)
Definition: SValBuilder.h:350
loc::ConcreteInt makeNullWithType(QualType type)
Create NULL pointer, with proper pointer bit-width for given address space.
Definition: SValBuilder.h:361
ProgramStateManager & StateMgr
Definition: SValBuilder.h:68
std::optional< SVal > getConstantVal(const Expr *E)
Returns the value of E, if it can be determined in a non-path-sensitive manner.
NonLoc makeLocAsInteger(Loc loc, unsigned bits)
Definition: SValBuilder.h:329
SVal evalIntegralCast(ProgramStateRef state, SVal val, QualType castTy, QualType originalType)
SymbolManager & getSymbolManager()
Definition: SValBuilder.h:164
DefinedOrUnknownSVal getRegionValueSymbolVal(const TypedValueRegion *region)
Make a unique symbol for value of region.
SVal evalBinOp(ProgramStateRef state, BinaryOperator::Opcode op, SVal lhs, SVal rhs, QualType type)
loc::ConcreteInt makeIntLocVal(const llvm::APSInt &integer)
Definition: SValBuilder.h:306
const AnalyzerOptions & AnOpts
Definition: SValBuilder.h:70
std::optional< loc::MemRegionVal > getCastedMemRegionVal(const MemRegion *region, QualType type)
Return MemRegionVal on success cast, otherwise return std::nullopt.
loc::MemRegionVal getAllocaRegionVal(const Expr *E, const LocationContext *LCtx, unsigned Count)
Create an SVal representing the result of an alloca()-like call, that is, an AllocaRegion on the stac...
nonloc::ConcreteInt makeBoolVal(const ObjCBoolLiteralExpr *boolean)
Definition: SValBuilder.h:296
SValBuilder(llvm::BumpPtrAllocator &alloc, ASTContext &context, ProgramStateManager &stateMgr)
Definition: SValBuilder.cpp:52
DefinedOrUnknownSVal getConjuredHeapSymbolVal(const Expr *E, const LocationContext *LCtx, unsigned Count)
Conjure a symbol representing heap allocated memory region.
SValVisitor - this class implements a simple visitor for SVal subclasses.
Definition: SValVisitor.h:27
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
bool isUnknownOrUndef() const
Definition: SVals.h:106
SymbolRef getAsSymbol(bool IncludeBaseRegions=false) const
If this SVal wraps a symbol return that SymbolRef.
Definition: SVals.cpp:104
std::optional< T > getAs() const
Convert to the specified SVal type, returning std::nullopt if this SVal is not of the desired type.
Definition: SVals.h:86
const MemRegion * getAsRegion() const
Definition: SVals.cpp:120
T castAs() const
Convert to the specified SVal type, asserting that this SVal is of the desired type.
Definition: SVals.h:82
bool isUnknown() const
Definition: SVals.h:102
std::optional< const MemRegion * > castRegion(const MemRegion *region, QualType CastToTy)
castRegion - Used by ExprEngine::VisitCast to handle casts from a MemRegion* to a specific location t...
Definition: Store.cpp:74
Symbolic value.
Definition: SymExpr.h:30
virtual QualType getType() const =0
virtual unsigned computeComplexity() const =0
const SymbolExtent * getExtentSymbol(const SubRegion *R)
const SymbolDerived * getDerivedSymbol(SymbolRef parentSymbol, const TypedValueRegion *R)
const SymbolMetadata * getMetadataSymbol(const MemRegion *R, const Stmt *S, QualType T, const LocationContext *LCtx, unsigned VisitCount, const void *SymbolTag=nullptr)
Creates a metadata symbol associated with a specific region.
const SymbolRegionValue * getRegionValueSymbol(const TypedValueRegion *R)
Make a unique symbol for MemRegion R according to its kind.
const SymbolConjured * conjureSymbol(const Stmt *E, const LocationContext *LCtx, QualType T, unsigned VisitCount, const void *SymbolTag=nullptr)
const SymIntExpr * getSymIntExpr(const SymExpr *lhs, BinaryOperator::Opcode op, const llvm::APSInt &rhs, QualType t)
const SymbolCast * getCastSymbol(const SymExpr *Operand, QualType From, QualType To)
const UnarySymExpr * getUnarySymExpr(const SymExpr *operand, UnaryOperator::Opcode op, QualType t)
static bool canSymbolicate(QualType T)
const SymSymExpr * getSymSymExpr(const SymExpr *lhs, BinaryOperator::Opcode op, const SymExpr *rhs, QualType t)
const IntSymExpr * getIntSymExpr(const llvm::APSInt &lhs, BinaryOperator::Opcode op, const SymExpr *rhs, QualType t)
SymbolicRegion - A special, "non-concrete" region.
Definition: MemRegion.h:775
TypedValueRegion - An abstract class representing regions having a typed value.
Definition: MemRegion.h:530
virtual QualType getValueType() const =0
Value representing integer constant.
Definition: SVals.h:297
const llvm::APSInt & getValue() const
Definition: SVals.h:301
Value representing pointer-to-member.
Definition: SVals.h:382
Represents symbolic expression that isn't a location.
Definition: SVals.h:276
LLVM_ATTRIBUTE_RETURNS_NONNULL SymbolRef getSymbol() const
Definition: SVals.h:285
const internal::VariadicAllOfMatcher< Type > type
Matches Types in the clang AST.
const internal::VariadicAllOfMatcher< Stmt > stmt
Matches statements.
const internal::VariadicDynCastAllOfMatcher< Stmt, Expr > expr
Matches expressions.
The JSON file list parser is used to communicate input to InstallAPI.
BinaryOperatorKind
@ Result
The result type of a method or function.
UnaryOperatorKind
const FunctionProtoType * T
EvalResult is a struct with detailed info about an evaluated expression.
Definition: Expr.h:642