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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: BuiltinFunctionChecker.cpp

//=== BuiltinFunctionChecker.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 evaluates clang builtin functions.
//
//===----------------------------------------------------------------------===//

#include "clang/Basic/Builtins.h"
#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/DynamicSize.h"

using namespace clang;
using namespace ento;

namespace {

class BuiltinFunctionChecker : public Checker<eval::Call> {
public:
  bool evalCall(const CallEvent &Call, CheckerContext &C) const;
};

}

bool BuiltinFunctionChecker::evalCall(const CallEvent &Call,
                                      CheckerContext &C) const {
  ProgramStateRef state = C.getState();
  const auto *FD = dyn_cast_or_null<FunctionDecl>(Call.getDecl());
  if (!FD)
    return false;

const LocationContext *LCtx = C.getLocationContext();
  const Expr *CE = Call.getOriginExpr();

switch (FD->getBuiltinID()) {
  default:
    return false;

case Builtin::BI__builtin_assume: {
    assert (Call.getNumArgs() > 0);
    SVal Arg = Call.getArgSVal(0);
    if (Arg.isUndef())
      return true; // Return true to model purity.

state = state->assume(Arg.castAs<DefinedOrUnknownSVal>(), true);
    // FIXME: do we want to warn here? Not right now. The most reports might
    // come from infeasible paths, thus being false positives.
    if (!state) {
      C.generateSink(C.getState(), C.getPredecessor());
      return true;
    }

C.addTransition(state);
    return true;
  }

case Builtin::BI__builtin_unpredictable:
  case Builtin::BI__builtin_expect:
  case Builtin::BI__builtin_expect_with_probability:
  case Builtin::BI__builtin_assume_aligned:
  case Builtin::BI__builtin_addressof: {
    // For __builtin_unpredictable, __builtin_expect,
    // __builtin_expect_with_probability and __builtin_assume_aligned,
    // just return the value of the subexpression.
    // __builtin_addressof is going from a reference to a pointer, but those
    // are represented the same way in the analyzer.
    assert (Call.getNumArgs() > 0);
    SVal Arg = Call.getArgSVal(0);
    C.addTransition(state->BindExpr(CE, LCtx, Arg));
    return true;
  }

case Builtin::BI__builtin_alloca_with_align:
  case Builtin::BI__builtin_alloca: {
    // FIXME: Refactor into StoreManager itself?
    MemRegionManager& RM = C.getStoreManager().getRegionManager();
    const AllocaRegion* R =
      RM.getAllocaRegion(CE, C.blockCount(), C.getLocationContext());

// Set the extent of the region in bytes. This enables us to use the
    // SVal of the argument directly. If we save the extent in bits, we
    // cannot represent values like symbol*8.
    auto Size = Call.getArgSVal(0);
    if (Size.isUndef())
      return true; // Return true to model purity.

SValBuilder& svalBuilder = C.getSValBuilder();
    DefinedOrUnknownSVal DynSize = getDynamicSize(state, R, svalBuilder);
    DefinedOrUnknownSVal DynSizeMatchesSizeArg =
        svalBuilder.evalEQ(state, DynSize, Size.castAs<DefinedOrUnknownSVal>());
    state = state->assume(DynSizeMatchesSizeArg, true);
    assert(state && "The region should not have any previous constraints");

C.addTransition(state->BindExpr(CE, LCtx, loc::MemRegionVal(R)));
    return true;
  }

case Builtin::BI__builtin_dynamic_object_size:
  case Builtin::BI__builtin_object_size:
  case Builtin::BI__builtin_constant_p: {
    // This must be resolvable at compile time, so we defer to the constant
    // evaluator for a value.
    SValBuilder &SVB = C.getSValBuilder();
    SVal V = UnknownVal();
    Expr::EvalResult EVResult;
    if (CE->EvaluateAsInt(EVResult, C.getASTContext(), Expr::SE_NoSideEffects)) {
      // Make sure the result has the correct type.
      llvm::APSInt Result = EVResult.Val.getInt();
      BasicValueFactory &BVF = SVB.getBasicValueFactory();
      BVF.getAPSIntType(CE->getType()).apply(Result);
      V = SVB.makeIntVal(Result);
    }

if (FD->getBuiltinID() == Builtin::BI__builtin_constant_p) {
      // If we didn't manage to figure out if the value is constant or not,
      // it is safe to assume that it's not constant and unsafe to assume
      // that it's constant.
      if (V.isUnknown())
        V = SVB.makeIntVal(0, CE->getType());
    }

C.addTransition(state->BindExpr(CE, LCtx, V));
    return true;
  }
  }
}

void ento::registerBuiltinFunctionChecker(CheckerManager &mgr) {
  mgr.registerChecker<BuiltinFunctionChecker>();
}

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

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Editing: BuiltinFunctionChecker.cpp

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