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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: ReturnUndefChecker.cpp

//== ReturnUndefChecker.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 file defines ReturnUndefChecker, which is a path-sensitive
// check which looks for undefined or garbage values being returned to the
// caller.
//
//===----------------------------------------------------------------------===//

#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/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"

using namespace clang;
using namespace ento;

namespace {
class ReturnUndefChecker : public Checker< check::PreStmt<ReturnStmt> > {
  mutable std::unique_ptr<BuiltinBug> BT_Undef;
  mutable std::unique_ptr<BuiltinBug> BT_NullReference;

void emitUndef(CheckerContext &C, const Expr *RetE) const;
  void checkReference(CheckerContext &C, const Expr *RetE,
                      DefinedOrUnknownSVal RetVal) const;
public:
  void checkPreStmt(const ReturnStmt *RS, CheckerContext &C) const;
};
}

void ReturnUndefChecker::checkPreStmt(const ReturnStmt *RS,
                                      CheckerContext &C) const {
  const Expr *RetE = RS->getRetValue();
  if (!RetE)
    return;
  SVal RetVal = C.getSVal(RetE);

const StackFrameContext *SFC = C.getStackFrame();
  QualType RT = CallEvent::getDeclaredResultType(SFC->getDecl());

if (RetVal.isUndef()) {
    // "return;" is modeled to evaluate to an UndefinedVal. Allow UndefinedVal
    // to be returned in functions returning void to support this pattern:
    //   void foo() {
    //     return;
    //   }
    //   void test() {
    //     return foo();
    //   }
    if (!RT.isNull() && RT->isVoidType())
      return;

// Not all blocks have explicitly-specified return types; if the return type
    // is not available, but the return value expression has 'void' type, assume
    // Sema already checked it.
    if (RT.isNull() && isa<BlockDecl>(SFC->getDecl()) &&
        RetE->getType()->isVoidType())
      return;

emitUndef(C, RetE);
    return;
  }

if (RT.isNull())
    return;

if (RT->isReferenceType()) {
    checkReference(C, RetE, RetVal.castAs<DefinedOrUnknownSVal>());
    return;
  }
}

static void emitBug(CheckerContext &C, BuiltinBug &BT, const Expr *RetE,
                    const Expr *TrackingE = nullptr) {
  ExplodedNode *N = C.generateErrorNode();
  if (!N)
    return;

auto Report =
      std::make_unique<PathSensitiveBugReport>(BT, BT.getDescription(), N);

Report->addRange(RetE->getSourceRange());
  bugreporter::trackExpressionValue(N, TrackingE ? TrackingE : RetE, *Report);

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

void ReturnUndefChecker::emitUndef(CheckerContext &C, const Expr *RetE) const {
  if (!BT_Undef)
    BT_Undef.reset(
        new BuiltinBug(this, "Garbage return value",
                       "Undefined or garbage value returned to caller"));
  emitBug(C, *BT_Undef, RetE);
}

void ReturnUndefChecker::checkReference(CheckerContext &C, const Expr *RetE,
                                        DefinedOrUnknownSVal RetVal) const {
  ProgramStateRef StNonNull, StNull;
  std::tie(StNonNull, StNull) = C.getState()->assume(RetVal);

if (StNonNull) {
    // Going forward, assume the location is non-null.
    C.addTransition(StNonNull);
    return;
  }

// The return value is known to be null. Emit a bug report.
  if (!BT_NullReference)
    BT_NullReference.reset(new BuiltinBug(this, "Returning null reference"));

emitBug(C, *BT_NullReference, RetE, bugreporter::getDerefExpr(RetE));
}

void ento::registerReturnUndefChecker(CheckerManager &mgr) {
  mgr.registerChecker<ReturnUndefChecker>();
}

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

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Editing: ReturnUndefChecker.cpp

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