C++ QualType::isNullPtrType方法代码示例

DefinedOrUnknownSVal
SValBuilder::getConjuredHeapSymbolVal(const Expr *E,
                                      const LocationContext *LCtx,
                                      unsigned VisitCount) {
  QualType T = E->getType();
  assert(Loc::isLocType(T));
  assert(SymbolManager::canSymbolicate(T));
  if (T->isNullPtrType())
    return makeZeroVal(T);

  SymbolRef sym = SymMgr.conjureSymbol(E, LCtx, T, VisitCount);
  return loc::MemRegionVal(MemMgr.getSymbolicHeapRegion(sym));
}

DefinedOrUnknownSVal SValBuilder::conjureSymbolVal(const Stmt *stmt,
                                                   const LocationContext *LCtx,
                                                   QualType type,
                                                   unsigned visitCount) {
  if (type->isNullPtrType())
    return makeZeroVal(type);

  if (!SymbolManager::canSymbolicate(type))
    return UnknownVal();

  SymbolRef sym = SymMgr.conjureSymbol(stmt, LCtx, type, visitCount);

  if (Loc::isLocType(type))
    return loc::MemRegionVal(MemMgr.getSymbolicRegion(sym));

  return nonloc::SymbolVal(sym);
}

//.........这里部分代码省略.........
            return T == C.UnsignedCharTy || T == C.SignedCharTy ? Match
                                                                : NoMatch;
          case BuiltinType::Short:
            return T == C.UnsignedShortTy ? Match : NoMatch;
          case BuiltinType::UShort:
            return T == C.ShortTy ? Match : NoMatch;
          case BuiltinType::Int:
            return T == C.UnsignedIntTy ? Match : NoMatch;
          case BuiltinType::UInt:
            return T == C.IntTy ? Match : NoMatch;
          case BuiltinType::Long:
            return T == C.UnsignedLongTy ? Match : NoMatch;
          case BuiltinType::ULong:
            return T == C.LongTy ? Match : NoMatch;
          case BuiltinType::LongLong:
            return T == C.UnsignedLongLongTy ? Match : NoMatch;
          case BuiltinType::ULongLong:
            return T == C.LongLongTy ? Match : NoMatch;
        }
      return NoMatch;
    }

    case CStrTy: {
      const PointerType *PT = argTy->getAs<PointerType>();
      if (!PT)
        return NoMatch;
      QualType pointeeTy = PT->getPointeeType();
      if (const BuiltinType *BT = pointeeTy->getAs<BuiltinType>())
        switch (BT->getKind()) {
          case BuiltinType::Void:
          case BuiltinType::Char_U:
          case BuiltinType::UChar:
          case BuiltinType::Char_S:
          case BuiltinType::SChar:
            return Match;
          default:
            break;
        }

      return NoMatch;
    }

    case WCStrTy: {
      const PointerType *PT = argTy->getAs<PointerType>();
      if (!PT)
        return NoMatch;
      QualType pointeeTy =
        C.getCanonicalType(PT->getPointeeType()).getUnqualifiedType();
      return pointeeTy == C.getWideCharType() ? Match : NoMatch;
    }

    case WIntTy: {

      QualType PromoArg = 
        argTy->isPromotableIntegerType()
          ? C.getPromotedIntegerType(argTy) : argTy;

      QualType WInt = C.getCanonicalType(C.getWIntType()).getUnqualifiedType();
      PromoArg = C.getCanonicalType(PromoArg).getUnqualifiedType();

      // If the promoted argument is the corresponding signed type of the
      // wint_t type, then it should match.
      if (PromoArg->hasSignedIntegerRepresentation() &&
          C.getCorrespondingUnsignedType(PromoArg) == WInt)
        return Match;

      return WInt == PromoArg ? Match : NoMatch;
    }

    case CPointerTy:
      if (argTy->isVoidPointerType()) {
        return Match;
      } if (argTy->isPointerType() || argTy->isObjCObjectPointerType() ||
            argTy->isBlockPointerType() || argTy->isNullPtrType()) {
        return NoMatchPedantic;
      } else {
        return NoMatch;
      }

    case ObjCPointerTy: {
      if (argTy->getAs<ObjCObjectPointerType>() ||
          argTy->getAs<BlockPointerType>())
        return Match;

      // Handle implicit toll-free bridging.
      if (const PointerType *PT = argTy->getAs<PointerType>()) {
        // Things such as CFTypeRef are really just opaque pointers
        // to C structs representing CF types that can often be bridged
        // to Objective-C objects.  Since the compiler doesn't know which
        // structs can be toll-free bridged, we just accept them all.
        QualType pointee = PT->getPointeeType();
        if (pointee->getAsStructureType() || pointee->isVoidType())
          return Match;
      }
      return NoMatch;
    }
  }

  llvm_unreachable("Invalid ArgType Kind!");
}

/// CheckReinterpretCast - Check that a reinterpret_cast\<DestType\>(SrcExpr) is
/// valid.
/// Refer to C++ 5.2.10 for details. reinterpret_cast is typically used in code
/// like this:
/// char *bytes = reinterpret_cast\<char*\>(int_ptr);
void
CheckReinterpretCast(Sema &Self, Expr *&SrcExpr, QualType DestType,
                     const SourceRange &OpRange, const SourceRange &DestRange)
{
  QualType OrigDestType = DestType, OrigSrcType = SrcExpr->getType();

  DestType = Self.Context.getCanonicalType(DestType);
  QualType SrcType = SrcExpr->getType();
  if (const LValueReferenceType *DestTypeTmp =
        DestType->getAsLValueReferenceType()) {
    if (SrcExpr->isLvalue(Self.Context) != Expr::LV_Valid) {
      // Cannot cast non-lvalue to reference type.
      Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_rvalue)
        << "reinterpret_cast" << OrigDestType << SrcExpr->getSourceRange();
      return;
    }

    // C++ 5.2.10p10: [...] a reference cast reinterpret_cast<T&>(x) has the
    //   same effect as the conversion *reinterpret_cast<T*>(&x) with the
    //   built-in & and * operators.
    // This code does this transformation for the checked types.
    DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
    SrcType = Self.Context.getPointerType(SrcType);
  } else if (const RValueReferenceType *DestTypeTmp =
               DestType->getAsRValueReferenceType()) {
    // Both the reference conversion and the rvalue rules apply.
    Self.DefaultFunctionArrayConversion(SrcExpr);
    SrcType = SrcExpr->getType();

    DestType = Self.Context.getPointerType(DestTypeTmp->getPointeeType());
    SrcType = Self.Context.getPointerType(SrcType);
  } else {
    // C++ 5.2.10p1: [...] the lvalue-to-rvalue, array-to-pointer, and
    //   function-to-pointer standard conversions are performed on the
    //   expression v.
    Self.DefaultFunctionArrayConversion(SrcExpr);
    SrcType = SrcExpr->getType();
  }

  // Canonicalize source for comparison.
  SrcType = Self.Context.getCanonicalType(SrcType);

  const MemberPointerType *DestMemPtr = DestType->getAsMemberPointerType(),
                          *SrcMemPtr = SrcType->getAsMemberPointerType();
  if (DestMemPtr && SrcMemPtr) {
    // C++ 5.2.10p9: An rvalue of type "pointer to member of X of type T1"
    //   can be explicitly converted to an rvalue of type "pointer to member
    //   of Y of type T2" if T1 and T2 are both function types or both object
    //   types.
    if (DestMemPtr->getPointeeType()->isFunctionType() !=
        SrcMemPtr->getPointeeType()->isFunctionType()) {
      Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic)
        << "reinterpret_cast" << OrigDestType << OrigSrcType << OpRange;
      return;
    }

    // C++ 5.2.10p2: The reinterpret_cast operator shall not cast away
    //   constness.
    if (CastsAwayConstness(Self, SrcType, DestType)) {
      Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_const_away)
        << "reinterpret_cast" << OrigDestType << OrigSrcType << OpRange;
      return;
    }

    // A valid member pointer cast.
    return;
  }

  // See below for the enumeral issue.
  if (SrcType->isNullPtrType() && DestType->isIntegralType() &&
      !DestType->isEnumeralType()) {
    // C++0x 5.2.10p4: A pointer can be explicitly converted to any integral
    //   type large enough to hold it. A value of std::nullptr_t can be
    //   converted to an integral type; the conversion has the same meaning
    //   and validity as a conversion of (void*)0 to the integral type.
    if (Self.Context.getTypeSize(SrcType) >
        Self.Context.getTypeSize(DestType)) {
      Self.Diag(OpRange.getBegin(), diag::err_bad_reinterpret_cast_small_int)
        << OrigDestType << DestRange;
    }
    return;
  }

  bool destIsPtr = DestType->isPointerType();
  bool srcIsPtr = SrcType->isPointerType();
  if (!destIsPtr && !srcIsPtr) {
    // Except for std::nullptr_t->integer and lvalue->reference, which are
    // handled above, at least one of the two arguments must be a pointer.
    Self.Diag(OpRange.getBegin(), diag::err_bad_cxx_cast_generic)
      << "reinterpret_cast" << OrigDestType << OrigSrcType << OpRange;
    return;
  }

  if (SrcType == DestType) {
    // C++ 5.2.10p2 has a note that mentions that, subject to all other
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        // 2.1) arrays:
        // call copyArray(T* src, void* placement, size_t size)
        Call = m_Sema->ActOnCallExpr(/*Scope*/0, m_UnresolvedCopyArray,
                                     locStart, CallArgs, locEnd);

      }
      else {
        if (!E->getSourceRange().isValid()) {
          // We cannot do CXXNewExpr::CallInit (see Sema::BuildCXXNew) but
          // that's what we want. Fail...
          return E;
        }
        TypeSourceInfo* ETSI
          = m_Context->getTrivialTypeSourceInfo(ETy, noLoc);

        Call = m_Sema->BuildCXXNew(E->getSourceRange(),
                                   /*useGlobal ::*/true,
                                   /*placementLParen*/ noLoc,
                                   MultiExprArg(placement),
                                   /*placementRParen*/ noLoc,
                                   /*TypeIdParens*/ SourceRange(),
                                   /*allocType*/ ETSI->getType(),
                                   /*allocTypeInfo*/ETSI,
                                   /*arraySize*/0,
                                   /*directInitRange*/E->getSourceRange(),
                                   /*initializer*/E,
                                   /*mayContainAuto*/false
                                   );
        // Handle possible cleanups:
        Call = m_Sema->ActOnFinishFullExpr(Call.get());
      }
    }
    else {
      // Mark the current number of arguemnts
      const size_t nArgs = CallArgs.size();
      if (desugaredTy->isIntegralOrEnumerationType()) {
        // 1)  enum, integral, float, double, referece, pointer types :
        //      call to cling::internal::setValueNoAlloc(...);

        // If the type is enum or integral we need to force-cast it into
        // uint64 in order to pick up the correct overload.
        if (desugaredTy->isIntegralOrEnumerationType()) {
          QualType UInt64Ty = m_Context->UnsignedLongLongTy;
          TypeSourceInfo* TSI
            = m_Context->getTrivialTypeSourceInfo(UInt64Ty, noLoc);
          Expr* castedE
            = m_Sema->BuildCStyleCastExpr(noLoc, TSI, noLoc, E).get();
          CallArgs.push_back(castedE);
        }
      }
      else if (desugaredTy->isReferenceType()) {
        // we need to get the address of the references
        Expr* AddrOfE = m_Sema->BuildUnaryOp(/*Scope*/0, noLoc, UO_AddrOf,
                                             E).get();
        CallArgs.push_back(AddrOfE);
      }
      else if (desugaredTy->isAnyPointerType()) {
        // function pointers need explicit void* cast.
        QualType VoidPtrTy = m_Context->VoidPtrTy;
        TypeSourceInfo* TSI
          = m_Context->getTrivialTypeSourceInfo(VoidPtrTy, noLoc);
        Expr* castedE
          = m_Sema->BuildCStyleCastExpr(noLoc, TSI, noLoc, E).get();
        CallArgs.push_back(castedE);
      }
      else if (desugaredTy->isNullPtrType()) {
        // nullptr should decay to void* just fine.
        CallArgs.push_back(E);
      }
      else if (desugaredTy->isFloatingType()) {
        // floats and double will fall naturally in the correct
        // case, because of the overload resolution.
        CallArgs.push_back(E);
      }

      // Test CallArgs.size to make sure an additional argument (the value)
      // has been pushed on, if not than we didn't know how to handle the type
      if (CallArgs.size() > nArgs) {
        Call = m_Sema->ActOnCallExpr(/*Scope*/0, m_UnresolvedNoAlloc,
                                   locStart, CallArgs, locEnd);
      }
      else {
        m_Sema->Diag(locStart, diag::err_unsupported_unknown_any_decl) <<
          utils::TypeName::GetFullyQualifiedName(desugaredTy, *m_Context) <<
          SourceRange(locStart, locEnd);
      }
    }


    assert(!Call.isInvalid() && "Invalid Call");

    // Extend the scope of the temporary cleaner if applicable.
    if (Cleanups) {
      Cleanups->setSubExpr(Call.get());
      Cleanups->setValueKind(Call.get()->getValueKind());
      Cleanups->setType(Call.get()->getType());
      return Cleanups;
    }
    return Call.get();
  }