path: root/include/clang/AST/CXXRecordDeclDefinitionBits.def

//===-- CXXRecordDeclDefinitionBits.def - Class definition bits -*- 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 enumerates the various bitfields that we want to store on C++ class
// definitions.
//
//===----------------------------------------------------------------------===//
//
/// @file CXXRecordDeclDefinitionBits.def
///
/// In this file, each of the bitfields representing data about a C++ class
/// results in an expansion of the FIELD macro, which should be defined before
/// including this file.
///
/// The macro have three operands:
///
/// Name: The name of the field, as a member of CXXRecordDecl::DefinitionData.
///
/// BitWidth: The width of the field in bits.
///
/// MergePolicy: How to behave when the value of the field is different in
/// multiple translation units, one of:
///   NO_MERGE: It is an ODR violation if the fields do not match.
///   MERGE_OR: Merge the fields by ORing them together.

#ifndef FIELD
#error define FIELD before including this file
#endif

/// True if this class has any user-declared constructors.
FIELD(UserDeclaredConstructor, 1, NO_MERGE)

/// The user-declared special members which this class has.
FIELD(UserDeclaredSpecialMembers, 6, NO_MERGE)

/// True when this class is an aggregate.
FIELD(Aggregate, 1, NO_MERGE)

/// True when this class is a POD-type.
FIELD(PlainOldData, 1, NO_MERGE)

/// True when this class is empty for traits purposes, that is:
///  * has no data members other than 0-width bit-fields and empty fields
///    marked [[no_unique_address]]
///  * has no virtual function/base, and
///  * doesn't inherit from a non-empty class.
/// Doesn't take union-ness into account.
FIELD(Empty, 1, NO_MERGE)

/// True when this class is polymorphic, i.e., has at
/// least one virtual member or derives from a polymorphic class.
FIELD(Polymorphic, 1, NO_MERGE)

/// True when this class is abstract, i.e., has at least
/// one pure virtual function, (that can come from a base class).
FIELD(Abstract, 1, NO_MERGE)

/// True when this class is standard-layout, per the applicable
/// language rules (including DRs).
FIELD(IsStandardLayout, 1, NO_MERGE)

/// True when this class was standard-layout under the C++11
/// definition.
///
/// C++11 [class]p7.  A standard-layout class is a class that:
/// * has no non-static data members of type non-standard-layout class (or
///   array of such types) or reference,
/// * has no virtual functions (10.3) and no virtual base classes (10.1),
/// * has the same access control (Clause 11) for all non-static data
///   members
/// * has no non-standard-layout base classes,
/// * either has no non-static data members in the most derived class and at
///   most one base class with non-static data members, or has no base
///   classes with non-static data members, and
/// * has no base classes of the same type as the first non-static data
///   member.
FIELD(IsCXX11StandardLayout, 1, NO_MERGE)

/// True when any base class has any declared non-static data
/// members or bit-fields.
/// This is a helper bit of state used to implement IsStandardLayout more
/// efficiently.
FIELD(HasBasesWithFields, 1, NO_MERGE)

/// True when any base class has any declared non-static data
/// members.
/// This is a helper bit of state used to implement IsCXX11StandardLayout
/// more efficiently.
FIELD(HasBasesWithNonStaticDataMembers, 1, NO_MERGE)

/// True when there are private non-static data members.
FIELD(HasPrivateFields, 1, NO_MERGE)

/// True when there are protected non-static data members.
FIELD(HasProtectedFields, 1, NO_MERGE)

/// True when there are private non-static data members.
FIELD(HasPublicFields, 1, NO_MERGE)

/// True if this class (or any subobject) has mutable fields.
FIELD(HasMutableFields, 1, NO_MERGE)

/// True if this class (or any nested anonymous struct or union)
/// has variant members.
FIELD(HasVariantMembers, 1, NO_MERGE)

/// True if there no non-field members declared by the user.
FIELD(HasOnlyCMembers, 1, NO_MERGE)

/// True if any field has an in-class initializer, including those
/// within anonymous unions or structs.
FIELD(HasInClassInitializer, 1, NO_MERGE)

/// True if any field is of reference type, and does not have an
/// in-class initializer.
///
/// In this case, value-initialization of this class is illegal in C++98
/// even if the class has a trivial default constructor.
FIELD(HasUninitializedReferenceMember, 1, NO_MERGE)

/// True if any non-mutable field whose type doesn't have a user-
/// provided default ctor also doesn't have an in-class initializer.
FIELD(HasUninitializedFields, 1, NO_MERGE)

/// True if there are any member using-declarations that inherit
/// constructors from a base class.
FIELD(HasInheritedConstructor, 1, NO_MERGE)

/// True if there are any member using-declarations named
/// 'operator='.
FIELD(HasInheritedAssignment, 1, NO_MERGE)

/// These flags are \c true if a defaulted corresponding special
/// member can't be fully analyzed without performing overload resolution.
/// @{
FIELD(NeedOverloadResolutionForCopyConstructor, 1, NO_MERGE)
FIELD(NeedOverloadResolutionForMoveConstructor, 1, NO_MERGE)
FIELD(NeedOverloadResolutionForMoveAssignment, 1, NO_MERGE)
FIELD(NeedOverloadResolutionForDestructor, 1, NO_MERGE)
/// @}

/// These flags are \c true if an implicit defaulted corresponding
/// special member would be defined as deleted.
/// @{
FIELD(DefaultedCopyConstructorIsDeleted, 1, NO_MERGE)
FIELD(DefaultedMoveConstructorIsDeleted, 1, NO_MERGE)
FIELD(DefaultedMoveAssignmentIsDeleted, 1, NO_MERGE)
FIELD(DefaultedDestructorIsDeleted, 1, NO_MERGE)
/// @}

/// The trivial special members which this class has, per
/// C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25,
/// C++11 [class.dtor]p5, or would have if the member were not suppressed.
///
/// This excludes any user-declared but not user-provided special members
/// which have been declared but not yet defined.
FIELD(HasTrivialSpecialMembers, 6, MERGE_OR)

/// These bits keep track of the triviality of special functions for the
/// purpose of calls. Only the bits corresponding to SMF_CopyConstructor,
/// SMF_MoveConstructor, and SMF_Destructor are meaningful here.
FIELD(HasTrivialSpecialMembersForCall, 6, MERGE_OR)

/// The declared special members of this class which are known to be
/// non-trivial.
///
/// This excludes any user-declared but not user-provided special members
/// which have been declared but not yet defined, and any implicit special
/// members which have not yet been declared.
FIELD(DeclaredNonTrivialSpecialMembers, 6, MERGE_OR)

/// These bits keep track of the declared special members that are
/// non-trivial for the purpose of calls.
/// Only the bits corresponding to SMF_CopyConstructor,
/// SMF_MoveConstructor, and SMF_Destructor are meaningful here.
FIELD(DeclaredNonTrivialSpecialMembersForCall, 6, MERGE_OR)

/// True when this class has a destructor with no semantic effect.
FIELD(HasIrrelevantDestructor, 1, NO_MERGE)

/// True when this class has at least one user-declared constexpr
/// constructor which is neither the copy nor move constructor.
FIELD(HasConstexprNonCopyMoveConstructor, 1, MERGE_OR)

/// True if this class has a (possibly implicit) defaulted default
/// constructor.
FIELD(HasDefaultedDefaultConstructor, 1, MERGE_OR)

/// True if a defaulted default constructor for this class would
/// be constexpr.
FIELD(DefaultedDefaultConstructorIsConstexpr, 1, NO_MERGE)

/// True if this class has a constexpr default constructor.
///
/// This is true for either a user-declared constexpr default constructor
/// or an implicitly declared constexpr default constructor.
FIELD(HasConstexprDefaultConstructor, 1, MERGE_OR)

/// True if a defaulted destructor for this class would be constexpr.
FIELD(DefaultedDestructorIsConstexpr, 1, NO_MERGE)

/// True when this class contains at least one non-static data
/// member or base class of non-literal or volatile type.
FIELD(HasNonLiteralTypeFieldsOrBases, 1, NO_MERGE)

/// Whether we have a C++11 user-provided default constructor (not
/// explicitly deleted or defaulted).
FIELD(UserProvidedDefaultConstructor, 1, NO_MERGE)

/// The special members which have been declared for this class,
/// either by the user or implicitly.
FIELD(DeclaredSpecialMembers, 6, MERGE_OR)

/// Whether an implicit copy constructor could have a const-qualified
/// parameter, for initializing virtual bases and for other subobjects.
FIELD(ImplicitCopyConstructorCanHaveConstParamForVBase, 1, NO_MERGE)
FIELD(ImplicitCopyConstructorCanHaveConstParamForNonVBase, 1, NO_MERGE)

/// Whether an implicit copy assignment operator would have a
/// const-qualified parameter.
FIELD(ImplicitCopyAssignmentHasConstParam, 1, NO_MERGE)

/// Whether any declared copy constructor has a const-qualified
/// parameter.
FIELD(HasDeclaredCopyConstructorWithConstParam, 1, MERGE_OR)

/// Whether any declared copy assignment operator has either a
/// const-qualified reference parameter or a non-reference parameter.
FIELD(HasDeclaredCopyAssignmentWithConstParam, 1, MERGE_OR)

#undef FIELD