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

📁 ..
📄 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: NonnullGlobalConstantsChecker.cpp

//==- NonnullGlobalConstantsChecker.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
//
//===----------------------------------------------------------------------===//
//
//  This checker adds an assumption that constant globals of certain types* are
//  non-null, as otherwise they generally do not convey any useful information.
//  The assumption is useful, as many framework use e. g. global const strings,
//  and the analyzer might not be able to infer the global value if the
//  definition is in a separate translation unit.
//  The following types (and their typedef aliases) are considered to be
//  non-null:
//   - `char* const`
//   - `const CFStringRef` from CoreFoundation
//   - `NSString* const` from Foundation
//   - `CFBooleanRef` from Foundation
//
//===----------------------------------------------------------------------===//

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

using namespace clang;
using namespace ento;

namespace {

class NonnullGlobalConstantsChecker : public Checker<check::Location> {
  mutable IdentifierInfo *NSStringII = nullptr;
  mutable IdentifierInfo *CFStringRefII = nullptr;
  mutable IdentifierInfo *CFBooleanRefII = nullptr;
  mutable IdentifierInfo *CFNullRefII = nullptr;

public:
  NonnullGlobalConstantsChecker() {}

void checkLocation(SVal l, bool isLoad, const Stmt *S,
                     CheckerContext &C) const;

private:
  void initIdentifierInfo(ASTContext &Ctx) const;

bool isGlobalConstString(SVal V) const;

bool isNonnullType(QualType Ty) const;
};

} // namespace

/// Lazily initialize cache for required identifier information.
void NonnullGlobalConstantsChecker::initIdentifierInfo(ASTContext &Ctx) const {
  if (NSStringII)
    return;

NSStringII = &Ctx.Idents.get("NSString");
  CFStringRefII = &Ctx.Idents.get("CFStringRef");
  CFBooleanRefII = &Ctx.Idents.get("CFBooleanRef");
  CFNullRefII = &Ctx.Idents.get("CFNullRef");
}

/// Add an assumption that const string-like globals are non-null.
void NonnullGlobalConstantsChecker::checkLocation(SVal location, bool isLoad,
                                                 const Stmt *S,
                                                 CheckerContext &C) const {
  initIdentifierInfo(C.getASTContext());
  if (!isLoad || !location.isValid())
    return;

ProgramStateRef State = C.getState();

if (isGlobalConstString(location)) {
    SVal V = State->getSVal(location.castAs<Loc>());
    Optional<DefinedOrUnknownSVal> Constr = V.getAs<DefinedOrUnknownSVal>();

if (Constr) {

// Assume that the variable is non-null.
      ProgramStateRef OutputState = State->assume(*Constr, true);
      C.addTransition(OutputState);
    }
  }
}

/// \param V loaded lvalue.
/// \return whether {@code val} is a string-like const global.
bool NonnullGlobalConstantsChecker::isGlobalConstString(SVal V) const {
  Optional<loc::MemRegionVal> RegionVal = V.getAs<loc::MemRegionVal>();
  if (!RegionVal)
    return false;
  auto *Region = dyn_cast<VarRegion>(RegionVal->getAsRegion());
  if (!Region)
    return false;
  const VarDecl *Decl = Region->getDecl();

if (!Decl->hasGlobalStorage())
    return false;

QualType Ty = Decl->getType();
  bool HasConst = Ty.isConstQualified();
  if (isNonnullType(Ty) && HasConst)
    return true;

// Look through the typedefs.
  while (const Type *T = Ty.getTypePtr()) {
    if (const auto *TT = dyn_cast<TypedefType>(T)) {
      Ty = TT->getDecl()->getUnderlyingType();
      // It is sufficient for any intermediate typedef
      // to be classified const.
      HasConst = HasConst || Ty.isConstQualified();
      if (isNonnullType(Ty) && HasConst)
        return true;
    } else if (const auto *AT = dyn_cast<AttributedType>(T)) {
      if (AT->getAttrKind() == attr::TypeNonNull)
        return true;
      Ty = AT->getModifiedType();
    } else {
      return false;
    }
  }
  return false;
}

/// \return whether {@code type} is extremely unlikely to be null
bool NonnullGlobalConstantsChecker::isNonnullType(QualType Ty) const {

if (Ty->isPointerType() && Ty->getPointeeType()->isCharType())
    return true;

if (auto *T = dyn_cast<ObjCObjectPointerType>(Ty)) {
    return T->getInterfaceDecl() &&
      T->getInterfaceDecl()->getIdentifier() == NSStringII;
  } else if (auto *T = dyn_cast<TypedefType>(Ty)) {
    IdentifierInfo* II = T->getDecl()->getIdentifier();
    return II == CFStringRefII || II == CFBooleanRefII || II == CFNullRefII;
  }
  return false;
}

void ento::registerNonnullGlobalConstantsChecker(CheckerManager &Mgr) {
  Mgr.registerChecker<NonnullGlobalConstantsChecker>();
}

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

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Editing: NonnullGlobalConstantsChecker.cpp

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