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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: UndefResultChecker.cpp

//=== UndefResultChecker.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 defines UndefResultChecker, a builtin check in ExprEngine that
// performs checks for undefined results of non-assignment binary operators.
//
//===----------------------------------------------------------------------===//

#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/DynamicSize.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/raw_ostream.h"

using namespace clang;
using namespace ento;

namespace {
class UndefResultChecker
  : public Checker< check::PostStmt<BinaryOperator> > {

mutable std::unique_ptr<BugType> BT;

public:
  void checkPostStmt(const BinaryOperator *B, CheckerContext &C) const;
};
} // end anonymous namespace

static bool isArrayIndexOutOfBounds(CheckerContext &C, const Expr *Ex) {
  ProgramStateRef state = C.getState();

if (!isa<ArraySubscriptExpr>(Ex))
    return false;

SVal Loc = C.getSVal(Ex);
  if (!Loc.isValid())
    return false;

const MemRegion *MR = Loc.castAs<loc::MemRegionVal>().getRegion();
  const ElementRegion *ER = dyn_cast<ElementRegion>(MR);
  if (!ER)
    return false;

DefinedOrUnknownSVal Idx = ER->getIndex().castAs<DefinedOrUnknownSVal>();
  DefinedOrUnknownSVal ElementCount = getDynamicElementCount(
      state, ER->getSuperRegion(), C.getSValBuilder(), ER->getValueType());
  ProgramStateRef StInBound = state->assumeInBound(Idx, ElementCount, true);
  ProgramStateRef StOutBound = state->assumeInBound(Idx, ElementCount, false);
  return StOutBound && !StInBound;
}

static bool isShiftOverflow(const BinaryOperator *B, CheckerContext &C) {
  return C.isGreaterOrEqual(
      B->getRHS(), C.getASTContext().getIntWidth(B->getLHS()->getType()));
}

static bool isLeftShiftResultUnrepresentable(const BinaryOperator *B,
                                             CheckerContext &C) {
  SValBuilder &SB = C.getSValBuilder();
  ProgramStateRef State = C.getState();
  const llvm::APSInt *LHS = SB.getKnownValue(State, C.getSVal(B->getLHS()));
  const llvm::APSInt *RHS = SB.getKnownValue(State, C.getSVal(B->getRHS()));
  assert(LHS && RHS && "Values unknown, inconsistent state");
  return (unsigned)RHS->getZExtValue() > LHS->countLeadingZeros();
}

void UndefResultChecker::checkPostStmt(const BinaryOperator *B,
                                       CheckerContext &C) const {
  if (C.getSVal(B).isUndef()) {

// Do not report assignments of uninitialized values inside swap functions.
    // This should allow to swap partially uninitialized structs
    // (radar://14129997)
    if (const FunctionDecl *EnclosingFunctionDecl =
        dyn_cast<FunctionDecl>(C.getStackFrame()->getDecl()))
      if (C.getCalleeName(EnclosingFunctionDecl) == "swap")
        return;

// Generate an error node.
    ExplodedNode *N = C.generateErrorNode();
    if (!N)
      return;

if (!BT)
      BT.reset(
          new BuiltinBug(this, "Result of operation is garbage or undefined"));

SmallString<256> sbuf;
    llvm::raw_svector_ostream OS(sbuf);
    const Expr *Ex = nullptr;
    bool isLeft = true;

if (C.getSVal(B->getLHS()).isUndef()) {
      Ex = B->getLHS()->IgnoreParenCasts();
      isLeft = true;
    }
    else if (C.getSVal(B->getRHS()).isUndef()) {
      Ex = B->getRHS()->IgnoreParenCasts();
      isLeft = false;
    }

if (Ex) {
      OS << "The " << (isLeft ? "left" : "right") << " operand of '"
         << BinaryOperator::getOpcodeStr(B->getOpcode())
         << "' is a garbage value";
      if (isArrayIndexOutOfBounds(C, Ex))
        OS << " due to array index out of bounds";
    } else {
      // Neither operand was undefined, but the result is undefined.
      if ((B->getOpcode() == BinaryOperatorKind::BO_Shl ||
           B->getOpcode() == BinaryOperatorKind::BO_Shr) &&
          C.isNegative(B->getRHS())) {
        OS << "The result of the "
           << ((B->getOpcode() == BinaryOperatorKind::BO_Shl) ? "left"
                                                              : "right")
           << " shift is undefined because the right operand is negative";
        Ex = B->getRHS();
      } else if ((B->getOpcode() == BinaryOperatorKind::BO_Shl ||
                  B->getOpcode() == BinaryOperatorKind::BO_Shr) &&
                 isShiftOverflow(B, C)) {

OS << "The result of the "
           << ((B->getOpcode() == BinaryOperatorKind::BO_Shl) ? "left"
                                                              : "right")
           << " shift is undefined due to shifting by ";
        Ex = B->getRHS();

SValBuilder &SB = C.getSValBuilder();
        const llvm::APSInt *I =
            SB.getKnownValue(C.getState(), C.getSVal(B->getRHS()));
        if (!I)
          OS << "a value that is";
        else if (I->isUnsigned())
          OS << '\'' << I->getZExtValue() << "\', which is";
        else
          OS << '\'' << I->getSExtValue() << "\', which is";

OS << " greater or equal to the width of type '"
           << B->getLHS()->getType().getAsString() << "'.";
      } else if (B->getOpcode() == BinaryOperatorKind::BO_Shl &&
                 C.isNegative(B->getLHS())) {
        OS << "The result of the left shift is undefined because the left "
              "operand is negative";
        Ex = B->getLHS();
      } else if (B->getOpcode() == BinaryOperatorKind::BO_Shl &&
                 isLeftShiftResultUnrepresentable(B, C)) {
        ProgramStateRef State = C.getState();
        SValBuilder &SB = C.getSValBuilder();
        const llvm::APSInt *LHS =
            SB.getKnownValue(State, C.getSVal(B->getLHS()));
        const llvm::APSInt *RHS =
            SB.getKnownValue(State, C.getSVal(B->getRHS()));
        OS << "The result of the left shift is undefined due to shifting \'"
           << LHS->getSExtValue() << "\' by \'" << RHS->getZExtValue()
           << "\', which is unrepresentable in the unsigned version of "
           << "the return type \'" << B->getLHS()->getType().getAsString()
           << "\'";
        Ex = B->getLHS();
      } else {
        OS << "The result of the '"
           << BinaryOperator::getOpcodeStr(B->getOpcode())
           << "' expression is undefined";
      }
    }
    auto report = std::make_unique<PathSensitiveBugReport>(*BT, OS.str(), N);
    if (Ex) {
      report->addRange(Ex->getSourceRange());
      bugreporter::trackExpressionValue(N, Ex, *report);
    }
    else
      bugreporter::trackExpressionValue(N, B, *report);

C.emitReport(std::move(report));
  }
}

void ento::registerUndefResultChecker(CheckerManager &mgr) {
  mgr.registerChecker<UndefResultChecker>();
}

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

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Editing: UndefResultChecker.cpp

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