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usr / src / contrib / llvm-project / clang / lib / StaticAnalyzer / Checkers /

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📄 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: ObjCUnusedIVarsChecker.cpp

//==- ObjCUnusedIVarsChecker.cpp - Check for unused ivars --------*- 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 a CheckObjCUnusedIvars, a checker that
//  analyzes an Objective-C class's interface/implementation to determine if it
//  has any ivars that are never accessed.
//
//===----------------------------------------------------------------------===//

#include "clang/StaticAnalyzer/Checkers/BuiltinCheckerRegistration.h"
#include "clang/Analysis/PathDiagnostic.h"
#include "clang/AST/Attr.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExprObjC.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/SourceManager.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
#include "clang/StaticAnalyzer/Core/Checker.h"

using namespace clang;
using namespace ento;

enum IVarState { Unused, Used };
typedef llvm::DenseMap<const ObjCIvarDecl*,IVarState> IvarUsageMap;

static void Scan(IvarUsageMap& M, const Stmt *S) {
  if (!S)
    return;

if (const ObjCIvarRefExpr *Ex = dyn_cast<ObjCIvarRefExpr>(S)) {
    const ObjCIvarDecl *D = Ex->getDecl();
    IvarUsageMap::iterator I = M.find(D);
    if (I != M.end())
      I->second = Used;
    return;
  }

// Blocks can reference an instance variable of a class.
  if (const BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
    Scan(M, BE->getBody());
    return;
  }

if (const PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(S))
    for (PseudoObjectExpr::const_semantics_iterator
        i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) {
      const Expr *sub = *i;
      if (const OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(sub))
        sub = OVE->getSourceExpr();
      Scan(M, sub);
    }

for (const Stmt *SubStmt : S->children())
    Scan(M, SubStmt);
}

static void Scan(IvarUsageMap& M, const ObjCPropertyImplDecl *D) {
  if (!D)
    return;

const ObjCIvarDecl *ID = D->getPropertyIvarDecl();

if (!ID)
    return;

IvarUsageMap::iterator I = M.find(ID);
  if (I != M.end())
    I->second = Used;
}

static void Scan(IvarUsageMap& M, const ObjCContainerDecl *D) {
  // Scan the methods for accesses.
  for (const auto *I : D->instance_methods())
    Scan(M, I->getBody());

if (const ObjCImplementationDecl *ID = dyn_cast<ObjCImplementationDecl>(D)) {
    // Scan for @synthesized property methods that act as setters/getters
    // to an ivar.
    for (const auto *I : ID->property_impls())
      Scan(M, I);

// Scan the associated categories as well.
    for (const auto *Cat : ID->getClassInterface()->visible_categories()) {
      if (const ObjCCategoryImplDecl *CID = Cat->getImplementation())
        Scan(M, CID);
    }
  }
}

static void Scan(IvarUsageMap &M, const DeclContext *C, const FileID FID,
                 const SourceManager &SM) {
  for (const auto *I : C->decls())
    if (const auto *FD = dyn_cast<FunctionDecl>(I)) {
      SourceLocation L = FD->getBeginLoc();
      if (SM.getFileID(L) == FID)
        Scan(M, FD->getBody());
    }
}

static void checkObjCUnusedIvar(const ObjCImplementationDecl *D,
                                BugReporter &BR,
                                const CheckerBase *Checker) {

const ObjCInterfaceDecl *ID = D->getClassInterface();
  IvarUsageMap M;

// Iterate over the ivars.
  for (const auto *Ivar : ID->ivars()) {
    // Ignore ivars that...
    // (a) aren't private
    // (b) explicitly marked unused
    // (c) are iboutlets
    // (d) are unnamed bitfields
    if (Ivar->getAccessControl() != ObjCIvarDecl::Private ||
        Ivar->hasAttr<UnusedAttr>() || Ivar->hasAttr<IBOutletAttr>() ||
        Ivar->hasAttr<IBOutletCollectionAttr>() ||
        Ivar->isUnnamedBitfield())
      continue;

M[Ivar] = Unused;
  }

if (M.empty())
    return;

// Now scan the implementation declaration.
  Scan(M, D);

// Any potentially unused ivars?
  bool hasUnused = false;
  for (IvarUsageMap::iterator I = M.begin(), E = M.end(); I!=E; ++I)
    if (I->second == Unused) {
      hasUnused = true;
      break;
    }

if (!hasUnused)
    return;

// We found some potentially unused ivars.  Scan the entire translation unit
  // for functions inside the @implementation that reference these ivars.
  // FIXME: In the future hopefully we can just use the lexical DeclContext
  // to go from the ObjCImplementationDecl to the lexically "nested"
  // C functions.
  const SourceManager &SM = BR.getSourceManager();
  Scan(M, D->getDeclContext(), SM.getFileID(D->getLocation()), SM);

// Find ivars that are unused.
  for (IvarUsageMap::iterator I = M.begin(), E = M.end(); I!=E; ++I)
    if (I->second == Unused) {
      std::string sbuf;
      llvm::raw_string_ostream os(sbuf);
      os << "Instance variable '" << *I->first << "' in class '" << *ID
         << "' is never used by the methods in its @implementation "
            "(although it may be used by category methods).";

PathDiagnosticLocation L =
        PathDiagnosticLocation::create(I->first, BR.getSourceManager());
      BR.EmitBasicReport(D, Checker, "Unused instance variable", "Optimization",
                         os.str(), L);
    }
}

//===----------------------------------------------------------------------===//
// ObjCUnusedIvarsChecker
//===----------------------------------------------------------------------===//

namespace {
class ObjCUnusedIvarsChecker : public Checker<
                                      check::ASTDecl<ObjCImplementationDecl> > {
public:
  void checkASTDecl(const ObjCImplementationDecl *D, AnalysisManager& mgr,
                    BugReporter &BR) const {
    checkObjCUnusedIvar(D, BR, this);
  }
};
}

void ento::registerObjCUnusedIvarsChecker(CheckerManager &mgr) {
  mgr.registerChecker<ObjCUnusedIvarsChecker>();
}

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

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Editing: ObjCUnusedIVarsChecker.cpp

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