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usr / src / contrib / llvm-project / clang / lib / StaticAnalyzer / Checkers /

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📄 AllocationState.h(1.41 KB)
📄 AnalysisOrderChecker.cpp(8.62 KB)
📄 AnalyzerStatsChecker.cpp(5.04 KB)
📄 ArrayBoundChecker.cpp(3.22 KB)
📄 ArrayBoundCheckerV2.cpp(13.07 KB)
📄 BasicObjCFoundationChecks.cpp(43.82 KB)
📄 BlockInCriticalSectionChecker.cpp(6.69 KB)
📄 BoolAssignmentChecker.cpp(3.45 KB)
📄 BuiltinFunctionChecker.cpp(5 KB)
📄 CStringChecker.cpp(93.24 KB)
📄 CStringSyntaxChecker.cpp(9.8 KB)
📄 CXXSelfAssignmentChecker.cpp(3.08 KB)
📄 CallAndMessageChecker.cpp(26.57 KB)
📄 CastSizeChecker.cpp(4.96 KB)
📄 CastToStructChecker.cpp(4.43 KB)
📄 CastValueChecker.cpp(19.65 KB)
📄 CheckObjCDealloc.cpp(37.83 KB)
📄 CheckObjCInstMethSignature.cpp(4.8 KB)
📄 CheckPlacementNew.cpp(11.91 KB)
📄 CheckSecuritySyntaxOnly.cpp(38.79 KB)
📄 CheckSizeofPointer.cpp(3.16 KB)
📄 CheckerDocumentation.cpp(14.64 KB)
📄 ChrootChecker.cpp(4.88 KB)
📄 CloneChecker.cpp(8.28 KB)
📄 ContainerModeling.cpp(39.85 KB)
📄 ConversionChecker.cpp(7.11 KB)
📄 DeadStoresChecker.cpp(17.82 KB)
📄 DebugCheckers.cpp(10.41 KB)
📄 DebugContainerModeling.cpp(4.94 KB)
📄 DebugIteratorModeling.cpp(5.15 KB)
📄 DeleteWithNonVirtualDtorChecker.cpp(5.35 KB)
📄 DereferenceChecker.cpp(10.54 KB)
📄 DirectIvarAssignment.cpp(8.02 KB)
📄 DivZeroChecker.cpp(3.42 KB)
📄 DynamicTypeChecker.cpp(7.31 KB)
📄 DynamicTypePropagation.cpp(42.11 KB)
📄 EnumCastOutOfRangeChecker.cpp(5.75 KB)
📄 ExprInspectionChecker.cpp(15.6 KB)
📄 FixedAddressChecker.cpp(2.33 KB)
📄 FuchsiaHandleChecker.cpp(23.1 KB)
📄 GCDAntipatternChecker.cpp(7.85 KB)
📄 GTestChecker.cpp(10.52 KB)
📄 GenericTaintChecker.cpp(34.31 KB)
📄 IdenticalExprChecker.cpp(18.88 KB)
📄 InnerPointerChecker.cpp(11.54 KB)
📄 InterCheckerAPI.h(1.09 KB)
📄 InvalidatedIteratorChecker.cpp(4.93 KB)
📄 Iterator.cpp(10.62 KB)
📄 Iterator.h(6.32 KB)
📄 IteratorModeling.cpp(31.33 KB)
📄 IteratorRangeChecker.cpp(12.64 KB)
📄 IvarInvalidationChecker.cpp(27.63 KB)
📄 LLVMConventionsChecker.cpp(9.9 KB)
📄 LocalizationChecker.cpp(52.38 KB)
📄 MIGChecker.cpp(11.3 KB)
📁 MPI-Checker
📄 MacOSKeychainAPIChecker.cpp(25.21 KB)
📄 MacOSXAPIChecker.cpp(6.61 KB)
📄 MallocChecker.cpp(127.38 KB)
📄 MallocOverflowSecurityChecker.cpp(11.91 KB)
📄 MallocSizeofChecker.cpp(8.03 KB)
📄 MismatchedIteratorChecker.cpp(11.01 KB)
📄 MmapWriteExecChecker.cpp(3.22 KB)
📄 Move.h(1.07 KB)
📄 MoveChecker.cpp(27 KB)
📄 NSAutoreleasePoolChecker.cpp(2.93 KB)
📄 NSErrorChecker.cpp(10.6 KB)
📄 NoReturnFunctionChecker.cpp(5.48 KB)
📄 NonNullParamChecker.cpp(11.22 KB)
📄 NonnullGlobalConstantsChecker.cpp(5.09 KB)
📄 NullabilityChecker.cpp(46.95 KB)
📄 NumberObjectConversionChecker.cpp(13.69 KB)
📄 OSObjectCStyleCast.cpp(3.14 KB)
📄 ObjCAtSyncChecker.cpp(3.34 KB)
📄 ObjCAutoreleaseWriteChecker.cpp(8.62 KB)
📄 ObjCContainersASTChecker.cpp(5.5 KB)
📄 ObjCContainersChecker.cpp(6.71 KB)
📄 ObjCMissingSuperCallChecker.cpp(9.23 KB)
📄 ObjCPropertyChecker.cpp(3.03 KB)
📄 ObjCSelfInitChecker.cpp(16.21 KB)
📄 ObjCSuperDeallocChecker.cpp(9.33 KB)
📄 ObjCUnusedIVarsChecker.cpp(6.01 KB)
📄 PaddingChecker.cpp(14.26 KB)
📄 PointerArithChecker.cpp(12.18 KB)
📄 PointerIterationChecker.cpp(3.79 KB)
📄 PointerSortingChecker.cpp(4.5 KB)
📄 PointerSubChecker.cpp(2.56 KB)
📄 PthreadLockChecker.cpp(28.42 KB)
📁 RetainCountChecker
📄 ReturnPointerRangeChecker.cpp(3.39 KB)
📄 ReturnUndefChecker.cpp(4.1 KB)
📄 ReturnValueChecker.cpp(5.79 KB)
📄 RunLoopAutoreleaseLeakChecker.cpp(7.2 KB)
📄 STLAlgorithmModeling.cpp(7 KB)
📄 SimpleStreamChecker.cpp(9.43 KB)
📄 SmartPtr.h(1.17 KB)
📄 SmartPtrChecker.cpp(2.68 KB)
📄 SmartPtrModeling.cpp(8.05 KB)
📄 StackAddrEscapeChecker.cpp(15 KB)
📄 StdLibraryFunctionsChecker.cpp(74.86 KB)
📄 StreamChecker.cpp(37.36 KB)
📄 Taint.cpp(9.04 KB)
📄 Taint.h(4.19 KB)
📄 TaintTesterChecker.cpp(2.17 KB)
📄 TestAfterDivZeroChecker.cpp(8.19 KB)
📄 TraversalChecker.cpp(4.38 KB)
📄 TrustNonnullChecker.cpp(9.12 KB)
📄 UndefBranchChecker.cpp(3.82 KB)
📄 UndefCapturedBlockVarChecker.cpp(3.64 KB)
📄 UndefResultChecker.cpp(7.19 KB)
📄 UndefinedArraySubscriptChecker.cpp(2.36 KB)
📄 UndefinedAssignmentChecker.cpp(3.74 KB)
📁 UninitializedObject
📄 UnixAPIChecker.cpp(18.05 KB)
📄 UnreachableCodeChecker.cpp(9.59 KB)
📄 VLASizeChecker.cpp(10.95 KB)
📄 ValistChecker.cpp(15.65 KB)
📄 VforkChecker.cpp(7.67 KB)
📄 VirtualCallChecker.cpp(8.11 KB)
📁 WebKit
📄 Yaml.h(2.06 KB)
📁 cert

Editing: EnumCastOutOfRangeChecker.cpp

//===- EnumCastOutOfRangeChecker.cpp ---------------------------*- C++ -*--===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// The EnumCastOutOfRangeChecker is responsible for checking integer to
// enumeration casts that could result in undefined values. This could happen
// if the value that we cast from is out of the value range of the enumeration.
// Reference:
// [ISO/IEC 14882-2014] ISO/IEC 14882-2014.
//   Programming Languages — C++, Fourth Edition. 2014.
// C++ Standard, [dcl.enum], in paragraph 8, which defines the range of an enum
// C++ Standard, [expr.static.cast], paragraph 10, which defines the behaviour
//   of casting an integer value that is out of range
// SEI CERT C++ Coding Standard, INT50-CPP. Do not cast to an out-of-range
//   enumeration value
//===----------------------------------------------------------------------===//

#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"

using namespace clang;
using namespace ento;

namespace {
// This evaluator checks two SVals for equality. The first SVal is provided via
// the constructor, the second is the parameter of the overloaded () operator.
// It uses the in-built ConstraintManager to resolve the equlity to possible or
// not possible ProgramStates.
class ConstraintBasedEQEvaluator {
  const DefinedOrUnknownSVal CompareValue;
  const ProgramStateRef PS;
  SValBuilder &SVB;

public:
  ConstraintBasedEQEvaluator(CheckerContext &C,
                             const DefinedOrUnknownSVal CompareValue)
      : CompareValue(CompareValue), PS(C.getState()), SVB(C.getSValBuilder()) {}

bool operator()(const llvm::APSInt &EnumDeclInitValue) {
    DefinedOrUnknownSVal EnumDeclValue = SVB.makeIntVal(EnumDeclInitValue);
    DefinedOrUnknownSVal ElemEqualsValueToCast =
        SVB.evalEQ(PS, EnumDeclValue, CompareValue);

return static_cast<bool>(PS->assume(ElemEqualsValueToCast, true));
  }
};

// This checker checks CastExpr statements.
// If the value provided to the cast is one of the values the enumeration can
// represent, the said value matches the enumeration. If the checker can
// establish the impossibility of matching it gives a warning.
// Being conservative, it does not warn if there is slight possibility the
// value can be matching.
class EnumCastOutOfRangeChecker : public Checker<check::PreStmt<CastExpr>> {
  mutable std::unique_ptr<BuiltinBug> EnumValueCastOutOfRange;
  void reportWarning(CheckerContext &C) const;

public:
  void checkPreStmt(const CastExpr *CE, CheckerContext &C) const;
};

using EnumValueVector = llvm::SmallVector<llvm::APSInt, 6>;

// Collects all of the values an enum can represent (as SVals).
EnumValueVector getDeclValuesForEnum(const EnumDecl *ED) {
  EnumValueVector DeclValues(
      std::distance(ED->enumerator_begin(), ED->enumerator_end()));
  llvm::transform(ED->enumerators(), DeclValues.begin(),
                 [](const EnumConstantDecl *D) { return D->getInitVal(); });
  return DeclValues;
}
} // namespace

void EnumCastOutOfRangeChecker::reportWarning(CheckerContext &C) const {
  if (const ExplodedNode *N = C.generateNonFatalErrorNode()) {
    if (!EnumValueCastOutOfRange)
      EnumValueCastOutOfRange.reset(
          new BuiltinBug(this, "Enum cast out of range",
                         "The value provided to the cast expression is not in "
                         "the valid range of values for the enum"));
    C.emitReport(std::make_unique<PathSensitiveBugReport>(
        *EnumValueCastOutOfRange, EnumValueCastOutOfRange->getDescription(),
        N));
  }
}

void EnumCastOutOfRangeChecker::checkPreStmt(const CastExpr *CE,
                                             CheckerContext &C) const {

// Only perform enum range check on casts where such checks are valid.  For
  // all other cast kinds (where enum range checks are unnecessary or invalid),
  // just return immediately.  TODO: The set of casts whitelisted for enum
  // range checking may be incomplete.  Better to add a missing cast kind to
  // enable a missing check than to generate false negatives and have to remove
  // those later.
  switch (CE->getCastKind()) {
  case CK_IntegralCast:
    break;

default:
    return;
    break;
  }

// Get the value of the expression to cast.
  const llvm::Optional<DefinedOrUnknownSVal> ValueToCast =
      C.getSVal(CE->getSubExpr()).getAs<DefinedOrUnknownSVal>();

// If the value cannot be reasoned about (not even a DefinedOrUnknownSVal),
  // don't analyze further.
  if (!ValueToCast)
    return;

const QualType T = CE->getType();
  // Check whether the cast type is an enum.
  if (!T->isEnumeralType())
    return;

// If the cast is an enum, get its declaration.
  // If the isEnumeralType() returned true, then the declaration must exist
  // even if it is a stub declaration. It is up to the getDeclValuesForEnum()
  // function to handle this.
  const EnumDecl *ED = T->castAs<EnumType>()->getDecl();

EnumValueVector DeclValues = getDeclValuesForEnum(ED);
  // Check if any of the enum values possibly match.
  bool PossibleValueMatch = llvm::any_of(
      DeclValues, ConstraintBasedEQEvaluator(C, *ValueToCast));

// If there is no value that can possibly match any of the enum values, then
  // warn.
  if (!PossibleValueMatch)
    reportWarning(C);
}

void ento::registerEnumCastOutOfRangeChecker(CheckerManager &mgr) {
  mgr.registerChecker<EnumCastOutOfRangeChecker>();
}

bool ento::shouldRegisterEnumCastOutOfRangeChecker(const CheckerManager &mgr) {
  return true;
}

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Editing: EnumCastOutOfRangeChecker.cpp

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