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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: MacOSXAPIChecker.cpp

// MacOSXAPIChecker.h - Checks proper use of various MacOS X APIs --*- 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 MacOSXAPIChecker, which is an assortment of checks on calls
// to various, widely used Apple APIs.
//
// FIXME: What's currently in BasicObjCFoundationChecks.cpp should be migrated
// to here, using the new Checker interface.
//
//===----------------------------------------------------------------------===//

#include "clang/AST/Attr.h"
#include "clang/Basic/TargetInfo.h"
#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/ProgramStateTrait.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/raw_ostream.h"

using namespace clang;
using namespace ento;

namespace {
class MacOSXAPIChecker : public Checker< check::PreStmt<CallExpr> > {
  mutable std::unique_ptr<BugType> BT_dispatchOnce;

static const ObjCIvarRegion *getParentIvarRegion(const MemRegion *R);

public:
  void checkPreStmt(const CallExpr *CE, CheckerContext &C) const;

void CheckDispatchOnce(CheckerContext &C, const CallExpr *CE,
                         StringRef FName) const;

typedef void (MacOSXAPIChecker::*SubChecker)(CheckerContext &,
                                               const CallExpr *,
                                               StringRef FName) const;
};
} //end anonymous namespace

//===----------------------------------------------------------------------===//
// dispatch_once and dispatch_once_f
//===----------------------------------------------------------------------===//

const ObjCIvarRegion *
MacOSXAPIChecker::getParentIvarRegion(const MemRegion *R) {
  const SubRegion *SR = dyn_cast<SubRegion>(R);
  while (SR) {
    if (const ObjCIvarRegion *IR = dyn_cast<ObjCIvarRegion>(SR))
      return IR;
    SR = dyn_cast<SubRegion>(SR->getSuperRegion());
  }
  return nullptr;
}

void MacOSXAPIChecker::CheckDispatchOnce(CheckerContext &C, const CallExpr *CE,
                                         StringRef FName) const {
  if (CE->getNumArgs() < 1)
    return;

// Check if the first argument is improperly allocated.  If so, issue a
  // warning because that's likely to be bad news.
  const MemRegion *R = C.getSVal(CE->getArg(0)).getAsRegion();
  if (!R)
    return;

// Global variables are fine.
  const MemRegion *RB = R->getBaseRegion();
  const MemSpaceRegion *RS = RB->getMemorySpace();
  if (isa<GlobalsSpaceRegion>(RS))
    return;

// Handle _dispatch_once.  In some versions of the OS X SDK we have the case
  // that dispatch_once is a macro that wraps a call to _dispatch_once.
  // _dispatch_once is then a function which then calls the real dispatch_once.
  // Users do not care; they just want the warning at the top-level call.
  if (CE->getBeginLoc().isMacroID()) {
    StringRef TrimmedFName = FName.ltrim('_');
    if (TrimmedFName != FName)
      FName = TrimmedFName;
  }

SmallString<256> S;
  llvm::raw_svector_ostream os(S);
  bool SuggestStatic = false;
  os << "Call to '" << FName << "' uses";
  if (const VarRegion *VR = dyn_cast<VarRegion>(RB)) {
    const VarDecl *VD = VR->getDecl();
    // FIXME: These should have correct memory space and thus should be filtered
    // out earlier. This branch only fires when we're looking from a block,
    // which we analyze as a top-level declaration, onto a static local
    // in a function that contains the block.
    if (VD->isStaticLocal())
      return;
    // We filtered out globals earlier, so it must be a local variable
    // or a block variable which is under UnknownSpaceRegion.
    if (VR != R)
      os << " memory within";
    if (VD->hasAttr<BlocksAttr>())
      os << " the block variable '";
    else
      os << " the local variable '";
    os << VR->getDecl()->getName() << '\'';
    SuggestStatic = true;
  } else if (const ObjCIvarRegion *IVR = getParentIvarRegion(R)) {
    if (IVR != R)
      os << " memory within";
    os << " the instance variable '" << IVR->getDecl()->getName() << '\'';
  } else if (isa<HeapSpaceRegion>(RS)) {
    os << " heap-allocated memory";
  } else if (isa<UnknownSpaceRegion>(RS)) {
    // Presence of an IVar superregion has priority over this branch, because
    // ObjC objects are on the heap even if the core doesn't realize this.
    // Presence of a block variable base region has priority over this branch,
    // because block variables are known to be either on stack or on heap
    // (might actually move between the two, hence UnknownSpace).
    return;
  } else {
    os << " stack allocated memory";
  }
  os << " for the predicate value.  Using such transient memory for "
        "the predicate is potentially dangerous.";
  if (SuggestStatic)
    os << "  Perhaps you intended to declare the variable as 'static'?";

ExplodedNode *N = C.generateErrorNode();
  if (!N)
    return;

if (!BT_dispatchOnce)
    BT_dispatchOnce.reset(new BugType(this, "Improper use of 'dispatch_once'",
                                      "API Misuse (Apple)"));

auto report =
      std::make_unique<PathSensitiveBugReport>(*BT_dispatchOnce, os.str(), N);
  report->addRange(CE->getArg(0)->getSourceRange());
  C.emitReport(std::move(report));
}

//===----------------------------------------------------------------------===//
// Central dispatch function.
//===----------------------------------------------------------------------===//

void MacOSXAPIChecker::checkPreStmt(const CallExpr *CE,
                                    CheckerContext &C) const {
  StringRef Name = C.getCalleeName(CE);
  if (Name.empty())
    return;

SubChecker SC =
    llvm::StringSwitch<SubChecker>(Name)
      .Cases("dispatch_once",
             "_dispatch_once",
             "dispatch_once_f",
             &MacOSXAPIChecker::CheckDispatchOnce)
      .Default(nullptr);

if (SC)
    (this->*SC)(C, CE, Name);
}

//===----------------------------------------------------------------------===//
// Registration.
//===----------------------------------------------------------------------===//

void ento::registerMacOSXAPIChecker(CheckerManager &mgr) {
  mgr.registerChecker<MacOSXAPIChecker>();
}

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

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Editing: MacOSXAPIChecker.cpp

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