File Manager

003 File Manager

Current Path: /usr/src/contrib/llvm-project/clang/lib/StaticAnalyzer/Checkers

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: ConversionChecker.cpp

//=== ConversionChecker.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
//
//===----------------------------------------------------------------------===//
//
// Check that there is no loss of sign/precision in assignments, comparisons
// and multiplications.
//
// ConversionChecker uses path sensitive analysis to determine possible values
// of expressions. A warning is reported when:
// * a negative value is implicitly converted to an unsigned value in an
//   assignment, comparison or multiplication.
// * assignment / initialization when the source value is greater than the max
//   value of the target integer type
// * assignment / initialization when the source integer is above the range
//   where the target floating point type can represent all integers
//
// Many compilers and tools have similar checks that are based on semantic
// analysis. Those checks are sound but have poor precision. ConversionChecker
// is an alternative to those checks.
//
//===----------------------------------------------------------------------===//
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/AST/ParentMap.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 "llvm/ADT/APFloat.h"

#include <climits>

using namespace clang;
using namespace ento;

namespace {
class ConversionChecker : public Checker<check::PreStmt<ImplicitCastExpr>> {
public:
  void checkPreStmt(const ImplicitCastExpr *Cast, CheckerContext &C) const;

private:
  mutable std::unique_ptr<BuiltinBug> BT;

bool isLossOfPrecision(const ImplicitCastExpr *Cast, QualType DestType,
                         CheckerContext &C) const;

bool isLossOfSign(const ImplicitCastExpr *Cast, CheckerContext &C) const;

void reportBug(ExplodedNode *N, CheckerContext &C, const char Msg[]) const;
};
}

void ConversionChecker::checkPreStmt(const ImplicitCastExpr *Cast,
                                     CheckerContext &C) const {
  // TODO: For now we only warn about DeclRefExpr, to avoid noise. Warn for
  // calculations also.
  if (!isa<DeclRefExpr>(Cast->IgnoreParenImpCasts()))
    return;

// Don't warn for loss of sign/precision in macros.
  if (Cast->getExprLoc().isMacroID())
    return;

// Get Parent.
  const ParentMap &PM = C.getLocationContext()->getParentMap();
  const Stmt *Parent = PM.getParent(Cast);
  if (!Parent)
    return;

bool LossOfSign = false;
  bool LossOfPrecision = false;

// Loss of sign/precision in binary operation.
  if (const auto *B = dyn_cast<BinaryOperator>(Parent)) {
    BinaryOperator::Opcode Opc = B->getOpcode();
    if (Opc == BO_Assign) {
      LossOfSign = isLossOfSign(Cast, C);
      LossOfPrecision = isLossOfPrecision(Cast, Cast->getType(), C);
    } else if (Opc == BO_AddAssign || Opc == BO_SubAssign) {
      // No loss of sign.
      LossOfPrecision = isLossOfPrecision(Cast, B->getLHS()->getType(), C);
    } else if (Opc == BO_MulAssign) {
      LossOfSign = isLossOfSign(Cast, C);
      LossOfPrecision = isLossOfPrecision(Cast, B->getLHS()->getType(), C);
    } else if (Opc == BO_DivAssign || Opc == BO_RemAssign) {
      LossOfSign = isLossOfSign(Cast, C);
      // No loss of precision.
    } else if (Opc == BO_AndAssign) {
      LossOfSign = isLossOfSign(Cast, C);
      // No loss of precision.
    } else if (Opc == BO_OrAssign || Opc == BO_XorAssign) {
      LossOfSign = isLossOfSign(Cast, C);
      LossOfPrecision = isLossOfPrecision(Cast, B->getLHS()->getType(), C);
    } else if (B->isRelationalOp() || B->isMultiplicativeOp()) {
      LossOfSign = isLossOfSign(Cast, C);
    }
  } else if (isa<DeclStmt>(Parent)) {
    LossOfSign = isLossOfSign(Cast, C);
    LossOfPrecision = isLossOfPrecision(Cast, Cast->getType(), C);
  }

if (LossOfSign || LossOfPrecision) {
    // Generate an error node.
    ExplodedNode *N = C.generateNonFatalErrorNode(C.getState());
    if (!N)
      return;
    if (LossOfSign)
      reportBug(N, C, "Loss of sign in implicit conversion");
    if (LossOfPrecision)
      reportBug(N, C, "Loss of precision in implicit conversion");
  }
}

void ConversionChecker::reportBug(ExplodedNode *N, CheckerContext &C,
                                  const char Msg[]) const {
  if (!BT)
    BT.reset(
        new BuiltinBug(this, "Conversion", "Possible loss of sign/precision."));

// Generate a report for this bug.
  auto R = std::make_unique<PathSensitiveBugReport>(*BT, Msg, N);
  C.emitReport(std::move(R));
}

bool ConversionChecker::isLossOfPrecision(const ImplicitCastExpr *Cast,
                                          QualType DestType,
                                          CheckerContext &C) const {
  // Don't warn about explicit loss of precision.
  if (Cast->isEvaluatable(C.getASTContext()))
    return false;

QualType SubType = Cast->IgnoreParenImpCasts()->getType();

if (!DestType->isRealType() || !SubType->isIntegerType())
    return false;

const bool isFloat = DestType->isFloatingType();

const auto &AC = C.getASTContext();

// We will find the largest RepresentsUntilExp value such that the DestType
  // can exactly represent all nonnegative integers below 2^RepresentsUntilExp.
  unsigned RepresentsUntilExp;

if (isFloat) {
    const llvm::fltSemantics &Sema = AC.getFloatTypeSemantics(DestType);
    RepresentsUntilExp = llvm::APFloat::semanticsPrecision(Sema);
  } else {
    RepresentsUntilExp = AC.getIntWidth(DestType);
    if (RepresentsUntilExp == 1) {
      // This is just casting a number to bool, probably not a bug.
      return false;
    }
    if (DestType->isSignedIntegerType())
      RepresentsUntilExp--;
  }

if (RepresentsUntilExp >= sizeof(unsigned long long) * CHAR_BIT) {
    // Avoid overflow in our later calculations.
    return false;
  }

unsigned CorrectedSrcWidth = AC.getIntWidth(SubType);
  if (SubType->isSignedIntegerType())
    CorrectedSrcWidth--;

if (RepresentsUntilExp >= CorrectedSrcWidth) {
    // Simple case: the destination can store all values of the source type.
    return false;
  }

unsigned long long MaxVal = 1ULL << RepresentsUntilExp;
  if (isFloat) {
    // If this is a floating point type, it can also represent MaxVal exactly.
    MaxVal++;
  }
  return C.isGreaterOrEqual(Cast->getSubExpr(), MaxVal);
  // TODO: maybe also check negative values with too large magnitude.
}

bool ConversionChecker::isLossOfSign(const ImplicitCastExpr *Cast,
                                     CheckerContext &C) const {
  QualType CastType = Cast->getType();
  QualType SubType = Cast->IgnoreParenImpCasts()->getType();

if (!CastType->isUnsignedIntegerType() || !SubType->isSignedIntegerType())
    return false;

return C.isNegative(Cast->getSubExpr());
}

void ento::registerConversionChecker(CheckerManager &mgr) {
  mgr.registerChecker<ConversionChecker>();
}

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

003 File Manager

Editing: ConversionChecker.cpp

Upload File

Create Folder