Checker.h

Go to the documentation of this file.

//== Checker.h - Registration mechanism for checkers -------------*- C++ -*--=//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file defines Checker, used to create and register checkers.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_STATICANALYZER_CORE_CHECKER_H
#define LLVM_CLANG_STATICANALYZER_CORE_CHECKER_H

#include "clang/Analysis/ProgramPoint.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h"
#include "llvm/Support/Casting.h"

namespace clang {
namespace ento {
  class BugReporter;

namespace check {

struct _VoidCheck {
  static void _register(void *checker, CheckerManager &mgr) { }
};

template <typename DECL>
class ASTDecl {
  template <typename CHECKER>
  static void _checkDecl(void *checker, const Decl *D, AnalysisManager& mgr,
                         BugReporter &BR) {
    ((const CHECKER *)checker)->checkASTDecl(cast<DECL>(D), mgr, BR);
  }

  static bool _handlesDecl(const Decl *D) {
    return isa<DECL>(D);
  }
public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForDecl(CheckerManager::CheckDeclFunc(checker,
                                                       _checkDecl<CHECKER>),
                         _handlesDecl);
  }
};

class ASTCodeBody {
  template <typename CHECKER>
  static void _checkBody(void *checker, const Decl *D, AnalysisManager& mgr,
                         BugReporter &BR) {
    ((const CHECKER *)checker)->checkASTCodeBody(D, mgr, BR);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForBody(CheckerManager::CheckDeclFunc(checker,
                                                       _checkBody<CHECKER>));
  }
};

class EndOfTranslationUnit {
  template <typename CHECKER>
  static void _checkEndOfTranslationUnit(void *checker,
                                         const TranslationUnitDecl *TU, 
                                         AnalysisManager& mgr,
                                         BugReporter &BR) {
    ((const CHECKER *)checker)->checkEndOfTranslationUnit(TU, mgr, BR);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr){
    mgr._registerForEndOfTranslationUnit(
                              CheckerManager::CheckEndOfTranslationUnit(checker,
                                          _checkEndOfTranslationUnit<CHECKER>));
  }
};

template <typename STMT>
class PreStmt {
  template <typename CHECKER>
  static void _checkStmt(void *checker, const Stmt *S, CheckerContext &C) {
    ((const CHECKER *)checker)->checkPreStmt(cast<STMT>(S), C);
  }

  static bool _handlesStmt(const Stmt *S) {
    return isa<STMT>(S);
  }
public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPreStmt(CheckerManager::CheckStmtFunc(checker,
                                                          _checkStmt<CHECKER>),
                            _handlesStmt);
  }
};

template <typename STMT>
class PostStmt {
  template <typename CHECKER>
  static void _checkStmt(void *checker, const Stmt *S, CheckerContext &C) {
    ((const CHECKER *)checker)->checkPostStmt(cast<STMT>(S), C);
  }

  static bool _handlesStmt(const Stmt *S) {
    return isa<STMT>(S);
  }
public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPostStmt(CheckerManager::CheckStmtFunc(checker,
                                                           _checkStmt<CHECKER>),
                             _handlesStmt);
  }
};

class PreObjCMessage {
  template <typename CHECKER>
  static void _checkObjCMessage(void *checker, const ObjCMethodCall &msg,
                                CheckerContext &C) {
    ((const CHECKER *)checker)->checkPreObjCMessage(msg, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPreObjCMessage(
     CheckerManager::CheckObjCMessageFunc(checker, _checkObjCMessage<CHECKER>));
  }
};

class PostObjCMessage {
  template <typename CHECKER>
  static void _checkObjCMessage(void *checker, const ObjCMethodCall &msg,
                                CheckerContext &C) {
    ((const CHECKER *)checker)->checkPostObjCMessage(msg, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPostObjCMessage(
     CheckerManager::CheckObjCMessageFunc(checker, _checkObjCMessage<CHECKER>));
  }
};

class PreCall {
  template <typename CHECKER>
  static void _checkCall(void *checker, const CallEvent &msg,
                         CheckerContext &C) {
    ((const CHECKER *)checker)->checkPreCall(msg, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPreCall(
     CheckerManager::CheckCallFunc(checker, _checkCall<CHECKER>));
  }
};

class PostCall {
  template <typename CHECKER>
  static void _checkCall(void *checker, const CallEvent &msg,
                         CheckerContext &C) {
    ((const CHECKER *)checker)->checkPostCall(msg, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPostCall(
     CheckerManager::CheckCallFunc(checker, _checkCall<CHECKER>));
  }
};

class Location {
  template <typename CHECKER>
  static void _checkLocation(void *checker,
                             const SVal &location, bool isLoad, const Stmt *S,
                             CheckerContext &C) {
    ((const CHECKER *)checker)->checkLocation(location, isLoad, S, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForLocation(
           CheckerManager::CheckLocationFunc(checker, _checkLocation<CHECKER>));
  }
};

class Bind {
  template <typename CHECKER>
  static void _checkBind(void *checker,
                         const SVal &location, const SVal &val, const Stmt *S,
                         CheckerContext &C) {
    ((const CHECKER *)checker)->checkBind(location, val, S, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForBind(
           CheckerManager::CheckBindFunc(checker, _checkBind<CHECKER>));
  }
};

class EndAnalysis {
  template <typename CHECKER>
  static void _checkEndAnalysis(void *checker, ExplodedGraph &G,
                                BugReporter &BR, ExprEngine &Eng) {
    ((const CHECKER *)checker)->checkEndAnalysis(G, BR, Eng);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForEndAnalysis(
     CheckerManager::CheckEndAnalysisFunc(checker, _checkEndAnalysis<CHECKER>));
  }
};

class EndFunction {
  template <typename CHECKER>
  static void _checkEndFunction(void *checker,
                                CheckerContext &C) {
    ((const CHECKER *)checker)->checkEndFunction(C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForEndFunction(
     CheckerManager::CheckEndFunctionFunc(checker, _checkEndFunction<CHECKER>));
  }
};

class BranchCondition {
  template <typename CHECKER>
  static void _checkBranchCondition(void *checker, const Stmt *Condition,
                                    CheckerContext & C) {
    ((const CHECKER *)checker)->checkBranchCondition(Condition, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForBranchCondition(
      CheckerManager::CheckBranchConditionFunc(checker,
                                               _checkBranchCondition<CHECKER>));
  }
};

class LiveSymbols {
  template <typename CHECKER>
  static void _checkLiveSymbols(void *checker, ProgramStateRef state,
                                SymbolReaper &SR) {
    ((const CHECKER *)checker)->checkLiveSymbols(state, SR);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForLiveSymbols(
     CheckerManager::CheckLiveSymbolsFunc(checker, _checkLiveSymbols<CHECKER>));
  }
};

class DeadSymbols {
  template <typename CHECKER>
  static void _checkDeadSymbols(void *checker,
                                SymbolReaper &SR, CheckerContext &C) {
    ((const CHECKER *)checker)->checkDeadSymbols(SR, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForDeadSymbols(
     CheckerManager::CheckDeadSymbolsFunc(checker, _checkDeadSymbols<CHECKER>));
  }
};

class RegionChanges {
  template <typename CHECKER>
  static ProgramStateRef 
  _checkRegionChanges(void *checker,
                      ProgramStateRef state,
                      const InvalidatedSymbols *invalidated,
                      ArrayRef<const MemRegion *> Explicits,
                      ArrayRef<const MemRegion *> Regions,
                      const CallEvent *Call) {
    return ((const CHECKER *)checker)->checkRegionChanges(state, invalidated,
                                                      Explicits, Regions, Call);
  }
  template <typename CHECKER>
  static bool _wantsRegionChangeUpdate(void *checker,
                                       ProgramStateRef state) {
    return ((const CHECKER *)checker)->wantsRegionChangeUpdate(state);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForRegionChanges(
          CheckerManager::CheckRegionChangesFunc(checker,
                                                 _checkRegionChanges<CHECKER>),
          CheckerManager::WantsRegionChangeUpdateFunc(checker,
                                            _wantsRegionChangeUpdate<CHECKER>));
  }
};

class PointerEscape {
  template <typename CHECKER>
  static ProgramStateRef
  _checkPointerEscape(void *Checker,
                     ProgramStateRef State,
                     const InvalidatedSymbols &Escaped,
                     const CallEvent *Call,
                     PointerEscapeKind Kind,
                     RegionAndSymbolInvalidationTraits *ETraits) {

    if (!ETraits)
      return ((const CHECKER *)Checker)->checkPointerEscape(State,
                                                            Escaped,
                                                            Call,
                                                            Kind);

    InvalidatedSymbols RegularEscape;
    for (InvalidatedSymbols::const_iterator I = Escaped.begin(), 
                                            E = Escaped.end(); I != E; ++I)
      if (!ETraits->hasTrait(*I,
              RegionAndSymbolInvalidationTraits::TK_PreserveContents) &&
          !ETraits->hasTrait(*I,
              RegionAndSymbolInvalidationTraits::TK_SuppressEscape))
        RegularEscape.insert(*I);

    if (RegularEscape.empty())
      return State;

    return ((const CHECKER *)Checker)->checkPointerEscape(State,
                                                          RegularEscape,
                                                          Call,
                                                          Kind);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPointerEscape(
          CheckerManager::CheckPointerEscapeFunc(checker,
                                                _checkPointerEscape<CHECKER>));
  }
};

class ConstPointerEscape {
  template <typename CHECKER>
  static ProgramStateRef
  _checkConstPointerEscape(void *Checker,
                      ProgramStateRef State,
                      const InvalidatedSymbols &Escaped,
                      const CallEvent *Call,
                      PointerEscapeKind Kind,
                      RegionAndSymbolInvalidationTraits *ETraits) {

    if (!ETraits)
      return State;

    InvalidatedSymbols ConstEscape;
    for (InvalidatedSymbols::const_iterator I = Escaped.begin(), 
                                            E = Escaped.end(); I != E; ++I)
      if (ETraits->hasTrait(*I,
              RegionAndSymbolInvalidationTraits::TK_PreserveContents) &&
          !ETraits->hasTrait(*I,
              RegionAndSymbolInvalidationTraits::TK_SuppressEscape))
        ConstEscape.insert(*I);

    if (ConstEscape.empty())
      return State;

    return ((const CHECKER *)Checker)->checkConstPointerEscape(State,
                                                               ConstEscape,
                                                               Call,
                                                               Kind);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForPointerEscape(
      CheckerManager::CheckPointerEscapeFunc(checker,
                                            _checkConstPointerEscape<CHECKER>));
  }
};

  
template <typename EVENT>
class Event {
  template <typename CHECKER>
  static void _checkEvent(void *checker, const void *event) {
    ((const CHECKER *)checker)->checkEvent(*(const EVENT *)event);
  }
public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerListenerForEvent<EVENT>(
                 CheckerManager::CheckEventFunc(checker, _checkEvent<CHECKER>));
  }
};

} // end check namespace

namespace eval {

class Assume {
  template <typename CHECKER>
  static ProgramStateRef _evalAssume(void *checker,
                                         ProgramStateRef state,
                                         const SVal &cond,
                                         bool assumption) {
    return ((const CHECKER *)checker)->evalAssume(state, cond, assumption);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForEvalAssume(
                 CheckerManager::EvalAssumeFunc(checker, _evalAssume<CHECKER>));
  }
};

class Call {
  template <typename CHECKER>
  static bool _evalCall(void *checker, const CallExpr *CE, CheckerContext &C) {
    return ((const CHECKER *)checker)->evalCall(CE, C);
  }

public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerForEvalCall(
                     CheckerManager::EvalCallFunc(checker, _evalCall<CHECKER>));
  }
};

} // end eval namespace

class CheckerBase : public ProgramPointTag {
  CheckName Name;
  friend class ::clang::ento::CheckerManager;

public:
  StringRef getTagDescription() const override;
  CheckName getCheckName() const;

  /// See CheckerManager::runCheckersForPrintState.
  virtual void printState(raw_ostream &Out, ProgramStateRef State,
                          const char *NL, const char *Sep) const { }
};

/// Dump checker name to stream.
raw_ostream& operator<<(raw_ostream &Out, const CheckerBase &Checker);

/// Tag that can use a checker name as a message provider 
/// (see SimpleProgramPointTag).
class CheckerProgramPointTag : public SimpleProgramPointTag {
public:
  CheckerProgramPointTag(StringRef CheckerName, StringRef Msg);
  CheckerProgramPointTag(const CheckerBase *Checker, StringRef Msg);
};

template <typename CHECK1, typename CHECK2=check::_VoidCheck,
          typename CHECK3=check::_VoidCheck, typename CHECK4=check::_VoidCheck,
          typename CHECK5=check::_VoidCheck, typename CHECK6=check::_VoidCheck,
          typename CHECK7=check::_VoidCheck, typename CHECK8=check::_VoidCheck,
          typename CHECK9=check::_VoidCheck, typename CHECK10=check::_VoidCheck,
          typename CHECK11=check::_VoidCheck,typename CHECK12=check::_VoidCheck,
          typename CHECK13=check::_VoidCheck,typename CHECK14=check::_VoidCheck,
          typename CHECK15=check::_VoidCheck,typename CHECK16=check::_VoidCheck,
          typename CHECK17=check::_VoidCheck,typename CHECK18=check::_VoidCheck,
          typename CHECK19=check::_VoidCheck,typename CHECK20=check::_VoidCheck,
          typename CHECK21=check::_VoidCheck,typename CHECK22=check::_VoidCheck,
          typename CHECK23=check::_VoidCheck,typename CHECK24=check::_VoidCheck>
class Checker;

template <>
class Checker<check::_VoidCheck>
  : public CheckerBase 
{
  virtual void anchor();
public:
  static void _register(void *checker, CheckerManager &mgr) { }
};

template <typename CHECK1, typename CHECK2, typename CHECK3, typename CHECK4,
          typename CHECK5, typename CHECK6, typename CHECK7, typename CHECK8,
          typename CHECK9, typename CHECK10,typename CHECK11,typename CHECK12,
          typename CHECK13,typename CHECK14,typename CHECK15,typename CHECK16,
          typename CHECK17,typename CHECK18,typename CHECK19,typename CHECK20,
          typename CHECK21,typename CHECK22,typename CHECK23,typename CHECK24>
class Checker
    : public CHECK1,
      public Checker<CHECK2, CHECK3, CHECK4, CHECK5, CHECK6, CHECK7,
                     CHECK8, CHECK9, CHECK10,CHECK11,CHECK12,CHECK13,
                     CHECK14,CHECK15,CHECK16,CHECK17,CHECK18,CHECK19,
                     CHECK20,CHECK21,CHECK22,CHECK23,CHECK24> {
public:
  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    CHECK1::_register(checker, mgr);
    Checker<CHECK2, CHECK3, CHECK4, CHECK5, CHECK6, CHECK7,
            CHECK8, CHECK9, CHECK10,CHECK11,CHECK12,CHECK13,
            CHECK14,CHECK15,CHECK16,CHECK17,CHECK18,CHECK19,
            CHECK20,CHECK21,CHECK22,CHECK23,CHECK24>::_register(checker, mgr);
  }
};

template <typename EVENT>
class EventDispatcher {
  CheckerManager *Mgr;
public:
  EventDispatcher() : Mgr(nullptr) { }

  template <typename CHECKER>
  static void _register(CHECKER *checker, CheckerManager &mgr) {
    mgr._registerDispatcherForEvent<EVENT>();
    static_cast<EventDispatcher<EVENT> *>(checker)->Mgr = &mgr;
  }

  void dispatchEvent(const EVENT &event) const {
    Mgr->_dispatchEvent(event);
  }
};

/// \brief We dereferenced a location that may be null.
struct ImplicitNullDerefEvent {
  SVal Location;
  bool IsLoad;
  ExplodedNode *SinkNode;
  BugReporter *BR;
};

/// \brief A helper class which wraps a boolean value set to false by default.
///
/// This class should behave exactly like 'bool' except that it doesn't need to
/// be explicitly initialized.
struct DefaultBool {
  bool val;
  DefaultBool() : val(false) {}
  /*implicit*/ operator bool&() { return val; }
  /*implicit*/ operator const bool&() const { return val; }
  DefaultBool &operator=(bool b) { val = b; return *this; }
};

} // end ento namespace

} // end clang namespace

#endif