r310401 - PR19668, PR23034: Fix handling of move constructors and deleted copy

Richard Smith via cfe-commits cfe-commits at lists.llvm.org
Tue Aug 8 12:14:45 PDT 2017


I forgot to say:

Based on a patch by Vassil Vassilev, which was based on a patch by Bernd
Schmidt, which was based on a patch by Reid Kleckner.

On 8 August 2017 at 12:12, Richard Smith via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Author: rsmith
> Date: Tue Aug  8 12:12:28 2017
> New Revision: 310401
>
> URL: http://llvm.org/viewvc/llvm-project?rev=310401&view=rev
> Log:
> PR19668, PR23034: Fix handling of move constructors and deleted copy
> constructors when deciding whether classes should be passed indirectly.
>
> This fixes ABI differences between Clang and GCC:
>
>  * Previously, Clang ignored the move constructor when making this
>    determination. It now takes the move constructor into account, per
>    https://github.com/itanium-cxx-abi/cxx-abi/pull/17 (this change may
>    seem recent, but the ABI change was agreed on the Itanium C++ ABI
>    list a long time ago).
>
>  * Previously, Clang's behavior when the copy constructor was deleted
>    was unstable -- depending on whether the lazy declaration of the
>    copy constructor had been triggered, you might get different behavior.
>    We now eagerly declare the copy constructor whenever its deletedness
>    is unclear, and ignore deleted copy/move constructors when looking for
>    a trivial such constructor.
>
> This also fixes an ABI difference between Clang and MSVC:
>
>  * If the copy constructor would be implicitly deleted (but has not been
>    lazily declared yet), for instance because the class has an rvalue
>    reference member, we would pass it directly. We now pass such a class
>    indirectly, matching MSVC.
>
> Modified:
>     cfe/trunk/include/clang/AST/DeclCXX.h
>     cfe/trunk/lib/AST/ASTImporter.cpp
>     cfe/trunk/lib/AST/DeclCXX.cpp
>     cfe/trunk/lib/CodeGen/CGCXXABI.cpp
>     cfe/trunk/lib/CodeGen/ItaniumCXXABI.cpp
>     cfe/trunk/lib/CodeGen/MicrosoftCXXABI.cpp
>     cfe/trunk/lib/Sema/SemaDeclCXX.cpp
>     cfe/trunk/lib/Serialization/ASTReaderDecl.cpp
>     cfe/trunk/lib/Serialization/ASTWriter.cpp
>     cfe/trunk/test/CodeGenCXX/uncopyable-args.cpp
>     cfe/trunk/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
>
> Modified: cfe/trunk/include/clang/AST/DeclCXX.h
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/
> clang/AST/DeclCXX.h?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/include/clang/AST/DeclCXX.h (original)
> +++ cfe/trunk/include/clang/AST/DeclCXX.h Tue Aug  8 12:12:28 2017
> @@ -375,6 +375,7 @@ class CXXRecordDecl : public RecordDecl
>      /// \brief These flags are \c true if a defaulted corresponding
> special
>      /// member can't be fully analyzed without performing overload
> resolution.
>      /// @{
> +    unsigned NeedOverloadResolutionForCopyConstructor : 1;
>      unsigned NeedOverloadResolutionForMoveConstructor : 1;
>      unsigned NeedOverloadResolutionForMoveAssignment : 1;
>      unsigned NeedOverloadResolutionForDestructor : 1;
> @@ -383,6 +384,7 @@ class CXXRecordDecl : public RecordDecl
>      /// \brief These flags are \c true if an implicit defaulted
> corresponding
>      /// special member would be defined as deleted.
>      /// @{
> +    unsigned DefaultedCopyConstructorIsDeleted : 1;
>      unsigned DefaultedMoveConstructorIsDeleted : 1;
>      unsigned DefaultedMoveAssignmentIsDeleted : 1;
>      unsigned DefaultedDestructorIsDeleted : 1;
> @@ -415,6 +417,12 @@ class CXXRecordDecl : public RecordDecl
>      /// constructor.
>      unsigned HasDefaultedDefaultConstructor : 1;
>
> +    /// \brief True if this class can be passed in a
> non-address-preserving
> +    /// fashion (such as in registers) according to the C++ language
> rules.
> +    /// This does not imply anything about how the ABI in use will
> actually
> +    /// pass an object of this class.
> +    unsigned CanPassInRegisters : 1;
> +
>      /// \brief True if a defaulted default constructor for this class
> would
>      /// be constexpr.
>      unsigned DefaultedDefaultConstructorIsConstexpr : 1;
> @@ -811,18 +819,50 @@ public:
>      return data().FirstFriend.isValid();
>    }
>
> +  /// \brief \c true if a defaulted copy constructor for this class would
> be
> +  /// deleted.
> +  bool defaultedCopyConstructorIsDeleted() const {
> +    assert((!needsOverloadResolutionForCopyConstructor() ||
> +            (data().DeclaredSpecialMembers & SMF_CopyConstructor)) &&
> +           "this property has not yet been computed by Sema");
> +    return data().DefaultedCopyConstructorIsDeleted;
> +  }
> +
> +  /// \brief \c true if a defaulted move constructor for this class would
> be
> +  /// deleted.
> +  bool defaultedMoveConstructorIsDeleted() const {
> +    assert((!needsOverloadResolutionForMoveConstructor() ||
> +            (data().DeclaredSpecialMembers & SMF_MoveConstructor)) &&
> +           "this property has not yet been computed by Sema");
> +    return data().DefaultedMoveConstructorIsDeleted;
> +  }
> +
> +  /// \brief \c true if a defaulted destructor for this class would be
> deleted.
> +  bool defaultedDestructorIsDeleted() const {
> +    return !data().DefaultedDestructorIsDeleted;
> +  }
> +
> +  /// \brief \c true if we know for sure that this class has a single,
> +  /// accessible, unambiguous copy constructor that is not deleted.
> +  bool hasSimpleCopyConstructor() const {
> +    return !hasUserDeclaredCopyConstructor() &&
> +           !data().DefaultedCopyConstructorIsDeleted;
> +  }
> +
>    /// \brief \c true if we know for sure that this class has a single,
>    /// accessible, unambiguous move constructor that is not deleted.
>    bool hasSimpleMoveConstructor() const {
>      return !hasUserDeclaredMoveConstructor() && hasMoveConstructor() &&
>             !data().DefaultedMoveConstructorIsDeleted;
>    }
> +
>    /// \brief \c true if we know for sure that this class has a single,
>    /// accessible, unambiguous move assignment operator that is not
> deleted.
>    bool hasSimpleMoveAssignment() const {
>      return !hasUserDeclaredMoveAssignment() && hasMoveAssignment() &&
>             !data().DefaultedMoveAssignmentIsDeleted;
>    }
> +
>    /// \brief \c true if we know for sure that this class has an accessible
>    /// destructor that is not deleted.
>    bool hasSimpleDestructor() const {
> @@ -878,7 +918,16 @@ public:
>    /// \brief Determine whether we need to eagerly declare a defaulted copy
>    /// constructor for this class.
>    bool needsOverloadResolutionForCopyConstructor() const {
> -    return data().HasMutableFields;
> +    // C++17 [class.copy.ctor]p6:
> +    //   If the class definition declares a move constructor or move
> assignment
> +    //   operator, the implicitly declared copy constructor is defined as
> +    //   deleted.
> +    // In MSVC mode, sometimes a declared move assignment does not delete
> an
> +    // implicit copy constructor, so defer this choice to Sema.
> +    if (data().UserDeclaredSpecialMembers &
> +        (SMF_MoveConstructor | SMF_MoveAssignment))
> +      return true;
> +    return data().NeedOverloadResolutionForCopyConstructor;
>    }
>
>    /// \brief Determine whether an implicit copy constructor for this type
> @@ -919,7 +968,16 @@ public:
>             needsImplicitMoveConstructor();
>    }
>
> -  /// \brief Set that we attempted to declare an implicitly move
> +  /// \brief Set that we attempted to declare an implicit copy
> +  /// constructor, but overload resolution failed so we deleted it.
> +  void setImplicitCopyConstructorIsDeleted() {
> +    assert((data().DefaultedCopyConstructorIsDeleted ||
> +            needsOverloadResolutionForCopyConstructor()) &&
> +           "Copy constructor should not be deleted");
> +    data().DefaultedCopyConstructorIsDeleted = true;
> +  }
> +
> +  /// \brief Set that we attempted to declare an implicit move
>    /// constructor, but overload resolution failed so we deleted it.
>    void setImplicitMoveConstructorIsDeleted() {
>      assert((data().DefaultedMoveConstructorIsDeleted ||
> @@ -1316,6 +1374,18 @@ public:
>      return data().HasIrrelevantDestructor;
>    }
>
> +  /// \brief Determine whether this class has at least one trivial,
> non-deleted
> +  /// copy or move constructor.
> +  bool canPassInRegisters() const {
> +    return data().CanPassInRegisters;
> +  }
> +
> +  /// \brief Set that we can pass this RecordDecl in registers.
> +  // FIXME: This should be set as part of completeDefinition.
> +  void setCanPassInRegisters(bool CanPass) {
> +    data().CanPassInRegisters = CanPass;
> +  }
> +
>    /// \brief Determine whether this class has a non-literal or/ volatile
> type
>    /// non-static data member or base class.
>    bool hasNonLiteralTypeFieldsOrBases() const {
>
> Modified: cfe/trunk/lib/AST/ASTImporter.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/
> ASTImporter.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/AST/ASTImporter.cpp (original)
> +++ cfe/trunk/lib/AST/ASTImporter.cpp Tue Aug  8 12:12:28 2017
> @@ -956,12 +956,16 @@ bool ASTNodeImporter::ImportDefinition(R
>      ToData.HasUninitializedFields = FromData.HasUninitializedFields;
>      ToData.HasInheritedConstructor = FromData.HasInheritedConstructor;
>      ToData.HasInheritedAssignment = FromData.HasInheritedAssignment;
> +    ToData.NeedOverloadResolutionForCopyConstructor
> +      = FromData.NeedOverloadResolutionForCopyConstructor;
>      ToData.NeedOverloadResolutionForMoveConstructor
>        = FromData.NeedOverloadResolutionForMoveConstructor;
>      ToData.NeedOverloadResolutionForMoveAssignment
>        = FromData.NeedOverloadResolutionForMoveAssignment;
>      ToData.NeedOverloadResolutionForDestructor
>        = FromData.NeedOverloadResolutionForDestructor;
> +    ToData.DefaultedCopyConstructorIsDeleted
> +      = FromData.DefaultedCopyConstructorIsDeleted;
>      ToData.DefaultedMoveConstructorIsDeleted
>        = FromData.DefaultedMoveConstructorIsDeleted;
>      ToData.DefaultedMoveAssignmentIsDeleted
> @@ -973,6 +977,7 @@ bool ASTNodeImporter::ImportDefinition(R
>        = FromData.HasConstexprNonCopyMoveConstructor;
>      ToData.HasDefaultedDefaultConstructor
>        = FromData.HasDefaultedDefaultConstructor;
> +    ToData.CanPassInRegisters = FromData.CanPassInRegisters;
>      ToData.DefaultedDefaultConstructorIsConstexpr
>        = FromData.DefaultedDefaultConstructorIsConstexpr;
>      ToData.HasConstexprDefaultConstructor
>
> Modified: cfe/trunk/lib/AST/DeclCXX.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/
> DeclCXX.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/AST/DeclCXX.cpp (original)
> +++ cfe/trunk/lib/AST/DeclCXX.cpp Tue Aug  8 12:12:28 2017
> @@ -55,15 +55,18 @@ CXXRecordDecl::DefinitionData::Definitio
>        HasOnlyCMembers(true), HasInClassInitializer(false),
>        HasUninitializedReferenceMember(false),
> HasUninitializedFields(false),
>        HasInheritedConstructor(false), HasInheritedAssignment(false),
> +      NeedOverloadResolutionForCopyConstructor(false),
>        NeedOverloadResolutionForMoveConstructor(false),
>        NeedOverloadResolutionForMoveAssignment(false),
>        NeedOverloadResolutionForDestructor(false),
> +      DefaultedCopyConstructorIsDeleted(false),
>        DefaultedMoveConstructorIsDeleted(false),
>        DefaultedMoveAssignmentIsDeleted(false),
>        DefaultedDestructorIsDeleted(false), HasTrivialSpecialMembers(SMF_
> All),
>        DeclaredNonTrivialSpecialMembers(0), HasIrrelevantDestructor(true),
>        HasConstexprNonCopyMoveConstructor(false),
>        HasDefaultedDefaultConstructor(false),
> +      CanPassInRegisters(false),
>        DefaultedDefaultConstructorIsConstexpr(true),
>        HasConstexprDefaultConstructor(false),
>        HasNonLiteralTypeFieldsOrBases(false), ComputedVisibleConversions(
> false),
> @@ -352,8 +355,10 @@ CXXRecordDecl::setBases(CXXBaseSpecifier
>        setHasVolatileMember(true);
>
>      // Keep track of the presence of mutable fields.
> -    if (BaseClassDecl->hasMutableFields())
> +    if (BaseClassDecl->hasMutableFields()) {
>        data().HasMutableFields = true;
> +      data().NeedOverloadResolutionForCopyConstructor = true;
> +    }
>
>      if (BaseClassDecl->hasUninitializedReferenceMember())
>        data().HasUninitializedReferenceMember = true;
> @@ -406,6 +411,8 @@ void CXXRecordDecl::addedClassSubobject(
>    //    -- a direct or virtual base class B that cannot be copied/moved
> [...]
>    //    -- a non-static data member of class type M (or array thereof)
>    //       that cannot be copied or moved [...]
> +  if (!Subobj->hasSimpleCopyConstructor())
> +    data().NeedOverloadResolutionForCopyConstructor = true;
>    if (!Subobj->hasSimpleMoveConstructor())
>      data().NeedOverloadResolutionForMoveConstructor = true;
>
> @@ -426,6 +433,7 @@ void CXXRecordDecl::addedClassSubobject(
>    //    -- any non-static data member has a type with a destructor
>    //       that is deleted or inaccessible from the defaulted [ctor or
> dtor].
>    if (!Subobj->hasSimpleDestructor()) {
> +    data().NeedOverloadResolutionForCopyConstructor = true;
>      data().NeedOverloadResolutionForMoveConstructor = true;
>      data().NeedOverloadResolutionForDestructor = true;
>    }
> @@ -711,8 +719,10 @@ void CXXRecordDecl::addedMember(Decl *D)
>        data().IsStandardLayout = false;
>
>      // Keep track of the presence of mutable fields.
> -    if (Field->isMutable())
> +    if (Field->isMutable()) {
>        data().HasMutableFields = true;
> +      data().NeedOverloadResolutionForCopyConstructor = true;
> +    }
>
>      // C++11 [class.union]p8, DR1460:
>      //   If X is a union, a non-static data member of X that is not an
> anonymous
> @@ -756,6 +766,12 @@ void CXXRecordDecl::addedMember(Decl *D)
>        //   A standard-layout class is a class that:
>        //    -- has no non-static data members of type [...] reference,
>        data().IsStandardLayout = false;
> +
> +      // C++1z [class.copy.ctor]p10:
> +      //   A defaulted copy constructor for a class X is defined as
> deleted if X has:
> +      //    -- a non-static data member of rvalue reference type
> +      if (T->isRValueReferenceType())
> +        data().DefaultedCopyConstructorIsDeleted = true;
>      }
>
>      if (!Field->hasInClassInitializer() && !Field->isMutable()) {
> @@ -809,6 +825,10 @@ void CXXRecordDecl::addedMember(Decl *D)
>          // We may need to perform overload resolution to determine
> whether a
>          // field can be moved if it's const or volatile qualified.
>          if (T.getCVRQualifiers() & (Qualifiers::Const |
> Qualifiers::Volatile)) {
> +          // We need to care about 'const' for the copy constructor
> because an
> +          // implicit copy constructor might be declared with a non-const
> +          // parameter.
> +          data().NeedOverloadResolutionForCopyConstructor = true;
>            data().NeedOverloadResolutionForMoveConstructor = true;
>            data().NeedOverloadResolutionForMoveAssignment = true;
>          }
> @@ -819,6 +839,8 @@ void CXXRecordDecl::addedMember(Decl *D)
>          //    -- X is a union-like class that has a variant member with a
>          //       non-trivial [corresponding special member]
>          if (isUnion()) {
> +          if (FieldRec->hasNonTrivialCopyConstructor())
> +            data().DefaultedCopyConstructorIsDeleted = true;
>            if (FieldRec->hasNonTrivialMoveConstructor())
>              data().DefaultedMoveConstructorIsDeleted = true;
>            if (FieldRec->hasNonTrivialMoveAssignment())
> @@ -830,6 +852,8 @@ void CXXRecordDecl::addedMember(Decl *D)
>          // For an anonymous union member, our overload resolution will
> perform
>          // overload resolution for its members.
>          if (Field->isAnonymousStructOrUnion()) {
> +          data().NeedOverloadResolutionForCopyConstructor |=
> +              FieldRec->data().NeedOverloadResolutionForCopyConstructor;
>            data().NeedOverloadResolutionForMoveConstructor |=
>                FieldRec->data().NeedOverloadResolutionForMoveConstructor;
>            data().NeedOverloadResolutionForMoveAssignment |=
> @@ -915,8 +939,10 @@ void CXXRecordDecl::addedMember(Decl *D)
>          }
>
>          // Keep track of the presence of mutable fields.
> -        if (FieldRec->hasMutableFields())
> +        if (FieldRec->hasMutableFields()) {
>            data().HasMutableFields = true;
> +          data().NeedOverloadResolutionForCopyConstructor = true;
> +        }
>
>          // C++11 [class.copy]p13:
>          //   If the implicitly-defined constructor would satisfy the
> @@ -1450,7 +1476,7 @@ void CXXRecordDecl::completeDefinition()
>
>  void CXXRecordDecl::completeDefinition(CXXFinalOverriderMap
> *FinalOverriders) {
>    RecordDecl::completeDefinition();
> -
> +
>    // If the class may be abstract (but hasn't been marked as such), check
> for
>    // any pure final overriders.
>    if (mayBeAbstract()) {
>
> Modified: cfe/trunk/lib/CodeGen/CGCXXABI.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/
> CGCXXABI.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/CodeGen/CGCXXABI.cpp (original)
> +++ cfe/trunk/lib/CodeGen/CGCXXABI.cpp Tue Aug  8 12:12:28 2017
> @@ -30,38 +30,9 @@ void CGCXXABI::ErrorUnsupportedABI(CodeG
>  }
>
>  bool CGCXXABI::canCopyArgument(const CXXRecordDecl *RD) const {
> -  // If RD has a non-trivial move or copy constructor, we cannot copy the
> -  // argument.
> -  if (RD->hasNonTrivialCopyConstructor() || RD->
> hasNonTrivialMoveConstructor())
> -    return false;
> -
> -  // If RD has a non-trivial destructor, we cannot copy the argument.
> -  if (RD->hasNonTrivialDestructor())
> -    return false;
> -
>    // We can only copy the argument if there exists at least one trivial,
>    // non-deleted copy or move constructor.
> -  // FIXME: This assumes that all lazily declared copy and move
> constructors are
> -  // not deleted.  This assumption might not be true in some corner cases.
> -  bool CopyDeleted = false;
> -  bool MoveDeleted = false;
> -  for (const CXXConstructorDecl *CD : RD->ctors()) {
> -    if (CD->isCopyConstructor() || CD->isMoveConstructor()) {
> -      assert(CD->isTrivial());
> -      // We had at least one undeleted trivial copy or move ctor.  Return
> -      // directly.
> -      if (!CD->isDeleted())
> -        return true;
> -      if (CD->isCopyConstructor())
> -        CopyDeleted = true;
> -      else
> -        MoveDeleted = true;
> -    }
> -  }
> -
> -  // If all trivial copy and move constructors are deleted, we cannot
> copy the
> -  // argument.
> -  return !(CopyDeleted && MoveDeleted);
> +  return RD->canPassInRegisters();
>  }
>
>  llvm::Constant *CGCXXABI::GetBogusMemberPointer(QualType T) {
>
> Modified: cfe/trunk/lib/CodeGen/ItaniumCXXABI.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/
> ItaniumCXXABI.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/CodeGen/ItaniumCXXABI.cpp (original)
> +++ cfe/trunk/lib/CodeGen/ItaniumCXXABI.cpp Tue Aug  8 12:12:28 2017
> @@ -63,11 +63,8 @@ public:
>    bool classifyReturnType(CGFunctionInfo &FI) const override;
>
>    RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const override {
> -    // Structures with either a non-trivial destructor or a non-trivial
> -    // copy constructor are always indirect.
> -    // FIXME: Use canCopyArgument() when it is fixed to handle lazily
> declared
> -    // special members.
> -    if (RD->hasNonTrivialDestructor() || RD->
> hasNonTrivialCopyConstructor())
> +    // If C++ prohibits us from making a copy, pass by address.
> +    if (!canCopyArgument(RD))
>        return RAA_Indirect;
>      return RAA_Default;
>    }
> @@ -1014,10 +1011,8 @@ bool ItaniumCXXABI::classifyReturnType(C
>    if (!RD)
>      return false;
>
> -  // Return indirectly if we have a non-trivial copy ctor or non-trivial
> dtor.
> -  // FIXME: Use canCopyArgument() when it is fixed to handle lazily
> declared
> -  // special members.
> -  if (RD->hasNonTrivialDestructor() || RD->hasNonTrivialCopyConstructor())
> {
> +  // If C++ prohibits us from making a copy, return by address.
> +  if (!canCopyArgument(RD)) {
>      auto Align = CGM.getContext().getTypeAlignInChars(FI.
> getReturnType());
>      FI.getReturnInfo() = ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
>      return true;
>
> Modified: cfe/trunk/lib/CodeGen/MicrosoftCXXABI.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/
> MicrosoftCXXABI.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/CodeGen/MicrosoftCXXABI.cpp (original)
> +++ cfe/trunk/lib/CodeGen/MicrosoftCXXABI.cpp Tue Aug  8 12:12:28 2017
> @@ -819,46 +819,44 @@ MicrosoftCXXABI::getRecordArgABI(const C
>      return RAA_Default;
>
>    case llvm::Triple::x86_64:
> -    // Win64 passes objects with non-trivial copy ctors indirectly.
> -    if (RD->hasNonTrivialCopyConstructor())
> -      return RAA_Indirect;
> -
> -    // If an object has a destructor, we'd really like to pass it
> indirectly
> +    // If a class has a destructor, we'd really like to pass it indirectly
>      // because it allows us to elide copies.  Unfortunately, MSVC makes
> that
>      // impossible for small types, which it will pass in a single
> register or
>      // stack slot. Most objects with dtors are large-ish, so handle that
> early.
>      // We can't call out all large objects as being indirect because
> there are
>      // multiple x64 calling conventions and the C++ ABI code shouldn't
> dictate
>      // how we pass large POD types.
> +    //
> +    // Note: This permits small classes with nontrivial destructors to be
> +    // passed in registers, which is non-conforming.
>      if (RD->hasNonTrivialDestructor() &&
>          getContext().getTypeSize(RD->getTypeForDecl()) > 64)
>        return RAA_Indirect;
>
> -    // If this is true, the implicit copy constructor that Sema would have
> -    // created would not be deleted. FIXME: We should provide a more
> direct way
> -    // for CodeGen to ask whether the constructor was deleted.
> -    if (!RD->hasUserDeclaredCopyConstructor() &&
> -        !RD->hasUserDeclaredMoveConstructor() &&
> -        !RD->needsOverloadResolutionForMoveConstructor() &&
> -        !RD->hasUserDeclaredMoveAssignment() &&
> -        !RD->needsOverloadResolutionForMoveAssignment())
> -      return RAA_Default;
> -
> -    // Otherwise, Sema should have created an implicit copy constructor if
> -    // needed.
> -    assert(!RD->needsImplicitCopyConstructor());
> -
> -    // We have to make sure the trivial copy constructor isn't deleted.
> -    for (const CXXConstructorDecl *CD : RD->ctors()) {
> -      if (CD->isCopyConstructor()) {
> -        assert(CD->isTrivial());
> -        // We had at least one undeleted trivial copy ctor.  Return
> directly.
> -        if (!CD->isDeleted())
> -          return RAA_Default;
> +    // If a class has at least one non-deleted, trivial copy constructor,
> it
> +    // is passed according to the C ABI. Otherwise, it is passed
> indirectly.
> +    //
> +    // Note: This permits classes with non-trivial copy or move ctors to
> be
> +    // passed in registers, so long as they *also* have a trivial copy
> ctor,
> +    // which is non-conforming.
> +    if (RD->needsImplicitCopyConstructor()) {
> +      // If the copy ctor has not yet been declared, we can read its
> triviality
> +      // off the AST.
> +      if (!RD->defaultedCopyConstructorIsDeleted() &&
> +          RD->hasTrivialCopyConstructor())
> +        return RAA_Default;
> +    } else {
> +      // Otherwise, we need to find the copy constructor(s) and ask.
> +      for (const CXXConstructorDecl *CD : RD->ctors()) {
> +        if (CD->isCopyConstructor()) {
> +          // We had at least one nondeleted trivial copy ctor.  Return
> directly.
> +          if (!CD->isDeleted() && CD->isTrivial())
> +            return RAA_Default;
> +        }
>        }
>      }
>
> -    // The trivial copy constructor was deleted.  Return indirectly.
> +    // We have no trivial, non-deleted copy constructor.
>      return RAA_Indirect;
>    }
>
>
> Modified: cfe/trunk/lib/Sema/SemaDeclCXX.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/
> SemaDeclCXX.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/Sema/SemaDeclCXX.cpp (original)
> +++ cfe/trunk/lib/Sema/SemaDeclCXX.cpp Tue Aug  8 12:12:28 2017
> @@ -5726,6 +5726,53 @@ static void DefineImplicitSpecialMember(
>    }
>  }
>
> +/// Determine whether a type is permitted to be passed or returned in
> +/// registers, per C++ [class.temporary]p3.
> +static bool computeCanPassInRegisters(Sema &S, CXXRecordDecl *D) {
> +  if (D->isDependentType() || D->isInvalidDecl())
> +    return false;
> +
> +  // Per C++ [class.temporary]p3, the relevant condition is:
> +  //   each copy constructor, move constructor, and destructor of X is
> +  //   either trivial or deleted, and X has at least one non-deleted copy
> +  //   or move constructor
> +  bool HasNonDeletedCopyOrMove = false;
> +
> +  if (D->needsImplicitCopyConstructor() &&
> +      !D->defaultedCopyConstructorIsDeleted()) {
> +    if (!D->hasTrivialCopyConstructor())
> +      return false;
> +    HasNonDeletedCopyOrMove = true;
> +  }
> +
> +  if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() &&
> +      !D->defaultedMoveConstructorIsDeleted()) {
> +    if (!D->hasTrivialMoveConstructor())
> +      return false;
> +    HasNonDeletedCopyOrMove = true;
> +  }
> +
> +  if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted()
> &&
> +      !D->hasTrivialDestructor())
> +    return false;
> +
> +  for (const CXXMethodDecl *MD : D->methods()) {
> +    if (MD->isDeleted())
> +      continue;
> +
> +    auto *CD = dyn_cast<CXXConstructorDecl>(MD);
> +    if (CD && CD->isCopyOrMoveConstructor())
> +      HasNonDeletedCopyOrMove = true;
> +    else if (!isa<CXXDestructorDecl>(MD))
> +      continue;
> +
> +    if (!MD->isTrivial())
> +      return false;
> +  }
> +
> +  return HasNonDeletedCopyOrMove;
> +}
> +
>  /// \brief Perform semantic checks on a class definition that has been
>  /// completing, introducing implicitly-declared members, checking for
>  /// abstract types, etc.
> @@ -5870,6 +5917,8 @@ void Sema::CheckCompletedCXXClass(CXXRec
>    }
>
>    checkClassLevelDLLAttribute(Record);
> +
> +  Record->setCanPassInRegisters(computeCanPassInRegisters(*this,
> Record));
>  }
>
>  /// Look up the special member function that would be called by a special
> @@ -7496,8 +7545,7 @@ void Sema::ActOnFinishCXXMemberSpecifica
>                reinterpret_cast<Decl**>(FieldCollector->getCurFields()),
>                FieldCollector->getCurNumFields()), LBrac, RBrac,
> AttrList);
>
> -  CheckCompletedCXXClass(
> -                        dyn_cast_or_null<CXXRecordDecl>(TagDecl));
> +  CheckCompletedCXXClass(dyn_cast_or_null<CXXRecordDecl>(TagDecl));
>  }
>
>  /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared
> @@ -11929,8 +11977,10 @@ CXXConstructorDecl *Sema::DeclareImplici
>    Scope *S = getScopeForContext(ClassDecl);
>    CheckImplicitSpecialMemberDeclaration(S, CopyConstructor);
>
> -  if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor))
> +  if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) {
> +    ClassDecl->setImplicitCopyConstructorIsDeleted();
>      SetDeclDeleted(CopyConstructor, ClassLoc);
> +  }
>
>    if (S)
>      PushOnScopeChains(CopyConstructor, S, false);
>
> Modified: cfe/trunk/lib/Serialization/ASTReaderDecl.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/
> Serialization/ASTReaderDecl.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/Serialization/ASTReaderDecl.cpp (original)
> +++ cfe/trunk/lib/Serialization/ASTReaderDecl.cpp Tue Aug  8 12:12:28 2017
> @@ -1559,9 +1559,11 @@ void ASTDeclReader::ReadCXXDefinitionDat
>    Data.HasUninitializedFields = Record.readInt();
>    Data.HasInheritedConstructor = Record.readInt();
>    Data.HasInheritedAssignment = Record.readInt();
> +  Data.NeedOverloadResolutionForCopyConstructor = Record.readInt();
>    Data.NeedOverloadResolutionForMoveConstructor = Record.readInt();
>    Data.NeedOverloadResolutionForMoveAssignment = Record.readInt();
>    Data.NeedOverloadResolutionForDestructor = Record.readInt();
> +  Data.DefaultedCopyConstructorIsDeleted = Record.readInt();
>    Data.DefaultedMoveConstructorIsDeleted = Record.readInt();
>    Data.DefaultedMoveAssignmentIsDeleted = Record.readInt();
>    Data.DefaultedDestructorIsDeleted = Record.readInt();
> @@ -1570,6 +1572,7 @@ void ASTDeclReader::ReadCXXDefinitionDat
>    Data.HasIrrelevantDestructor = Record.readInt();
>    Data.HasConstexprNonCopyMoveConstructor = Record.readInt();
>    Data.HasDefaultedDefaultConstructor = Record.readInt();
> +  Data.CanPassInRegisters = Record.readInt();
>    Data.DefaultedDefaultConstructorIsConstexpr = Record.readInt();
>    Data.HasConstexprDefaultConstructor = Record.readInt();
>    Data.HasNonLiteralTypeFieldsOrBases = Record.readInt();
> @@ -1697,9 +1700,11 @@ void ASTDeclReader::MergeDefinitionData(
>    MATCH_FIELD(HasUninitializedFields)
>    MATCH_FIELD(HasInheritedConstructor)
>    MATCH_FIELD(HasInheritedAssignment)
> +  MATCH_FIELD(NeedOverloadResolutionForCopyConstructor)
>    MATCH_FIELD(NeedOverloadResolutionForMoveConstructor)
>    MATCH_FIELD(NeedOverloadResolutionForMoveAssignment)
>    MATCH_FIELD(NeedOverloadResolutionForDestructor)
> +  MATCH_FIELD(DefaultedCopyConstructorIsDeleted)
>    MATCH_FIELD(DefaultedMoveConstructorIsDeleted)
>    MATCH_FIELD(DefaultedMoveAssignmentIsDeleted)
>    MATCH_FIELD(DefaultedDestructorIsDeleted)
> @@ -1708,6 +1713,7 @@ void ASTDeclReader::MergeDefinitionData(
>    MATCH_FIELD(HasIrrelevantDestructor)
>    OR_FIELD(HasConstexprNonCopyMoveConstructor)
>    OR_FIELD(HasDefaultedDefaultConstructor)
> +  MATCH_FIELD(CanPassInRegisters)
>    MATCH_FIELD(DefaultedDefaultConstructorIsConstexpr)
>    OR_FIELD(HasConstexprDefaultConstructor)
>    MATCH_FIELD(HasNonLiteralTypeFieldsOrBases)
>
> Modified: cfe/trunk/lib/Serialization/ASTWriter.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/
> Serialization/ASTWriter.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/lib/Serialization/ASTWriter.cpp (original)
> +++ cfe/trunk/lib/Serialization/ASTWriter.cpp Tue Aug  8 12:12:28 2017
> @@ -5875,9 +5875,11 @@ void ASTRecordWriter::AddCXXDefinitionDa
>    Record->push_back(Data.HasUninitializedFields);
>    Record->push_back(Data.HasInheritedConstructor);
>    Record->push_back(Data.HasInheritedAssignment);
> +  Record->push_back(Data.NeedOverloadResolutionForCopyConstructor);
>    Record->push_back(Data.NeedOverloadResolutionForMoveConstructor);
>    Record->push_back(Data.NeedOverloadResolutionForMoveAssignment);
>    Record->push_back(Data.NeedOverloadResolutionForDestructor);
> +  Record->push_back(Data.DefaultedCopyConstructorIsDeleted);
>    Record->push_back(Data.DefaultedMoveConstructorIsDeleted);
>    Record->push_back(Data.DefaultedMoveAssignmentIsDeleted);
>    Record->push_back(Data.DefaultedDestructorIsDeleted);
> @@ -5886,6 +5888,7 @@ void ASTRecordWriter::AddCXXDefinitionDa
>    Record->push_back(Data.HasIrrelevantDestructor);
>    Record->push_back(Data.HasConstexprNonCopyMoveConstructor);
>    Record->push_back(Data.HasDefaultedDefaultConstructor);
> +  Record->push_back(Data.CanPassInRegisters);
>    Record->push_back(Data.DefaultedDefaultConstructorIsConstexpr);
>    Record->push_back(Data.HasConstexprDefaultConstructor);
>    Record->push_back(Data.HasNonLiteralTypeFieldsOrBases);
>
> Modified: cfe/trunk/test/CodeGenCXX/uncopyable-args.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/
> CodeGenCXX/uncopyable-args.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/test/CodeGenCXX/uncopyable-args.cpp (original)
> +++ cfe/trunk/test/CodeGenCXX/uncopyable-args.cpp Tue Aug  8 12:12:28 2017
> @@ -1,5 +1,6 @@
>  // RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown -emit-llvm
> -o - %s | FileCheck %s
> -// RUN: %clang_cc1 -std=c++11 -triple x86_64-windows-msvc -emit-llvm -o -
> %s | FileCheck %s -check-prefix=WIN64
> +// RUN: %clang_cc1 -std=c++11 -triple x86_64-windows-msvc -emit-llvm -o -
> %s -fms-compatibility -fms-compatibility-version=18 | FileCheck %s
> -check-prefix=WIN64 -check-prefix=WIN64-18
> +// RUN: %clang_cc1 -std=c++11 -triple x86_64-windows-msvc -emit-llvm -o -
> %s -fms-compatibility -fms-compatibility-version=19 | FileCheck %s
> -check-prefix=WIN64 -check-prefix=WIN64-19
>
>  namespace trivial {
>  // Trivial structs should be passed directly.
> @@ -52,12 +53,11 @@ void foo(A);
>  void bar() {
>    foo({});
>  }
> -// FIXME: The copy ctor is implicitly deleted.
> -// CHECK-DISABLED-LABEL: define void @_ZN9move_ctor3barEv()
> -// CHECK-DISABLED: call void @_Z{{.*}}C1Ev(
> -// CHECK-DISABLED-NOT: call
> -// CHECK-DISABLED: call void @_ZN9move_ctor3fooENS_1AE(%"struct.move_ctor::A"*
> %{{.*}})
> -// CHECK-DISABLED-LABEL: declare void @_ZN9move_ctor3fooENS_1AE(%"
> struct.move_ctor::A"*)
> +// CHECK-LABEL: define void @_ZN9move_ctor3barEv()
> +// CHECK: call void @_Z{{.*}}C1Ev(
> +// CHECK-NOT: call
> +// CHECK: call void @_ZN9move_ctor3fooENS_1AE(%"struct.move_ctor::A"*
> %{{.*}})
> +// CHECK-LABEL: declare void @_ZN9move_ctor3fooENS_1AE(%"
> struct.move_ctor::A"*)
>
>  // WIN64-LABEL: declare void @"\01?foo at move_ctor@@YAXUA at 1@@
> Z"(%"struct.move_ctor::A"*)
>  }
> @@ -73,12 +73,11 @@ void foo(A);
>  void bar() {
>    foo({});
>  }
> -// FIXME: The copy ctor is deleted.
> -// CHECK-DISABLED-LABEL: define void @_ZN11all_deleted3barEv()
> -// CHECK-DISABLED: call void @_Z{{.*}}C1Ev(
> -// CHECK-DISABLED-NOT: call
> -// CHECK-DISABLED: call void @_ZN11all_deleted3fooENS_1AE(%"struct.all_deleted::A"*
> %{{.*}})
> -// CHECK-DISABLED-LABEL: declare void @_ZN11all_deleted3fooENS_1AE(%
> "struct.all_deleted::A"*)
> +// CHECK-LABEL: define void @_ZN11all_deleted3barEv()
> +// CHECK: call void @_Z{{.*}}C1Ev(
> +// CHECK-NOT: call
> +// CHECK: call void @_ZN11all_deleted3fooENS_1AE(%"struct.all_deleted::A"*
> %{{.*}})
> +// CHECK-LABEL: declare void @_ZN11all_deleted3fooENS_1AE(%
> "struct.all_deleted::A"*)
>
>  // WIN64-LABEL: declare void @"\01?foo at all_deleted@@YAXUA at 1
> @@Z"(%"struct.all_deleted::A"*)
>  }
> @@ -93,14 +92,15 @@ void foo(A);
>  void bar() {
>    foo({});
>  }
> -// FIXME: The copy and move ctors are implicitly deleted.
> -// CHECK-DISABLED-LABEL: define void @_ZN18implicitly_deleted3barEv()
> -// CHECK-DISABLED: call void @_Z{{.*}}C1Ev(
> -// CHECK-DISABLED-NOT: call
> -// CHECK-DISABLED: call void @_ZN18implicitly_
> deleted3fooENS_1AE(%"struct.implicitly_deleted::A"* %{{.*}})
> -// CHECK-DISABLED-LABEL: declare void @_ZN18implicitly_
> deleted3fooENS_1AE(%"struct.implicitly_deleted::A"*)
> -
> -// WIN64-LABEL: declare void @"\01?foo at implicitly_deleted@@YAXUA at 1
> @@Z"(%"struct.implicitly_deleted::A"*)
> +// CHECK-LABEL: define void @_ZN18implicitly_deleted3barEv()
> +// CHECK: call void @_Z{{.*}}C1Ev(
> +// CHECK-NOT: call
> +// CHECK: call void @_ZN18implicitly_deleted3fooENS_1AE(%"struct.implicitly_deleted::A"*
> %{{.*}})
> +// CHECK-LABEL: declare void @_ZN18implicitly_
> deleted3fooENS_1AE(%"struct.implicitly_deleted::A"*)
> +
> +// In MSVC 2013, the copy ctor is not deleted by a move assignment. In
> MSVC 2015, it is.
> +// WIN64-18-LABEL: declare void @"\01?foo at implicitly_deleted@@YAXUA at 1
> @@Z"(i64
> +// WIN64-19-LABEL: declare void @"\01?foo at implicitly_deleted@@YAXUA at 1
> @@Z"(%"struct.implicitly_deleted::A"*)
>  }
>
>  namespace one_deleted {
> @@ -113,12 +113,11 @@ void foo(A);
>  void bar() {
>    foo({});
>  }
> -// FIXME: The copy constructor is implicitly deleted.
> -// CHECK-DISABLED-LABEL: define void @_ZN11one_deleted3barEv()
> -// CHECK-DISABLED: call void @_Z{{.*}}C1Ev(
> -// CHECK-DISABLED-NOT: call
> -// CHECK-DISABLED: call void @_ZN11one_deleted3fooENS_1AE(%"struct.one_deleted::A"*
> %{{.*}})
> -// CHECK-DISABLED-LABEL: declare void @_ZN11one_deleted3fooENS_1AE(%
> "struct.one_deleted::A"*)
> +// CHECK-LABEL: define void @_ZN11one_deleted3barEv()
> +// CHECK: call void @_Z{{.*}}C1Ev(
> +// CHECK-NOT: call
> +// CHECK: call void @_ZN11one_deleted3fooENS_1AE(%"struct.one_deleted::A"*
> %{{.*}})
> +// CHECK-LABEL: declare void @_ZN11one_deleted3fooENS_1AE(%
> "struct.one_deleted::A"*)
>
>  // WIN64-LABEL: declare void @"\01?foo at one_deleted@@YAXUA at 1
> @@Z"(%"struct.one_deleted::A"*)
>  }
> @@ -195,12 +194,10 @@ void foo(B);
>  void bar() {
>    foo({});
>  }
> -// FIXME: This class has a non-trivial copy ctor and a trivial copy
> ctor.  It's
> -// not clear whether we should pass by address or in registers.
> -// CHECK-DISABLED-LABEL: define void @_ZN14two_copy_ctors3barEv()
> -// CHECK-DISABLED: call void @_Z{{.*}}C1Ev(
> -// CHECK-DISABLED: call void @_ZN14two_copy_ctors3fooENS_
> 1BE(%"struct.two_copy_ctors::B"* %{{.*}})
> -// CHECK-DISABLED-LABEL: declare void @_ZN14two_copy_ctors3fooENS_
> 1BE(%"struct.two_copy_ctors::B"*)
> +// CHECK-LABEL: define void @_ZN14two_copy_ctors3barEv()
> +// CHECK: call void @_Z{{.*}}C1Ev(
> +// CHECK: call void @_ZN14two_copy_ctors3fooENS_
> 1BE(%"struct.two_copy_ctors::B"* %{{.*}})
> +// CHECK-LABEL: declare void @_ZN14two_copy_ctors3fooENS_
> 1BE(%"struct.two_copy_ctors::B"*)
>
>  // WIN64-LABEL: declare void @"\01?foo at two_copy_ctors@@YAXUB at 1
> @@Z"(%"struct.two_copy_ctors::B"*)
>  }
> @@ -212,6 +209,7 @@ struct A {
>    void *p;
>  };
>  void *foo(A a) { return a.p; }
> +// CHECK-LABEL: define i8* @_ZN15definition_only3fooENS_
> 1AE(%"struct.definition_only::A"*
>  // WIN64-LABEL: define i8* @"\01?foo at definition_only@@YAPEAXUA at 1
> @@Z"(%"struct.definition_only::A"*
>  }
>
> @@ -226,6 +224,7 @@ struct A {
>    B b;
>  };
>  void *foo(A a) { return a.b.p; }
> +// CHECK-LABEL: define i8* @_ZN17deleted_by_member3fooENS_1AE(%"struct.
> deleted_by_member::A"*
>  // WIN64-LABEL: define i8* @"\01?foo at deleted_by_member@@YAPEAXUA at 1
> @@Z"(%"struct.deleted_by_member::A"*
>  }
>
> @@ -239,6 +238,7 @@ struct A : B {
>    A();
>  };
>  void *foo(A a) { return a.p; }
> +// CHECK-LABEL: define i8* @_ZN15deleted_by_base3fooENS_
> 1AE(%"struct.deleted_by_base::A"*
>  // WIN64-LABEL: define i8* @"\01?foo at deleted_by_base@@YAPEAXUA at 1
> @@Z"(%"struct.deleted_by_base::A"*
>  }
>
> @@ -253,6 +253,7 @@ struct A {
>    B b;
>  };
>  void *foo(A a) { return a.b.p; }
> +// CHECK-LABEL: define i8* @_ZN22deleted_by_member_
> copy3fooENS_1AE(%"struct.deleted_by_member_copy::A"*
>  // WIN64-LABEL: define i8* @"\01?foo at deleted_by_member_copy@@YAPEAXUA at 1
> @@Z"(%"struct.deleted_by_member_copy::A"*
>  }
>
> @@ -266,6 +267,7 @@ struct A : B {
>    A();
>  };
>  void *foo(A a) { return a.p; }
> +// CHECK-LABEL: define i8* @_ZN20deleted_by_base_
> copy3fooENS_1AE(%"struct.deleted_by_base_copy::A"*
>  // WIN64-LABEL: define i8* @"\01?foo at deleted_by_base_copy@@YAPEAXUA at 1
> @@Z"(%"struct.deleted_by_base_copy::A"*
>  }
>
> @@ -275,6 +277,75 @@ struct A {
>    A(const A &o) = delete;
>    void *p;
>  };
> +// CHECK-LABEL: define i8* @_ZN15explicit_delete3fooENS_
> 1AE(%"struct.explicit_delete::A"*
>  // WIN64-LABEL: define i8* @"\01?foo at explicit_delete@@YAPEAXUA at 1
> @@Z"(%"struct.explicit_delete::A"*
>  void *foo(A a) { return a.p; }
>  }
> +
> +namespace implicitly_deleted_copy_ctor {
> +struct A {
> +  // No move ctor due to copy assignment.
> +  A &operator=(const A&);
> +  // Deleted copy ctor due to rvalue ref member.
> +  int &&ref;
> +};
> +// CHECK-LABEL: define {{.*}} @_ZN28implicitly_deleted_copy_
> ctor3fooENS_1AE(%"struct.implicitly_deleted_copy_ctor::A"*
> +// WIN64-LABEL: define {{.*}} @"\01?foo at implicitly_deleted_copy_ctor@
> @YAAEAHUA at 1@@Z"(%"struct.implicitly_deleted_copy_ctor::A"*
> +int &foo(A a) { return a.ref; }
> +
> +struct B {
> +  // Passed direct: has non-deleted trivial copy ctor.
> +  B &operator=(const B&);
> +  int &ref;
> +};
> +int &foo(B b) { return b.ref; }
> +// CHECK-LABEL: define {{.*}} @_ZN28implicitly_deleted_copy_
> ctor3fooENS_1BE(i32*
> +// WIN64-LABEL: define {{.*}} @"\01?foo at implicitly_deleted_copy_ctor@
> @YAAEAHUB at 1@@Z"(i64
> +
> +struct X { X(const X&); };
> +struct Y { Y(const Y&) = default; };
> +
> +union C {
> +  C &operator=(const C&);
> +  // Passed indirect: copy ctor deleted due to variant member with
> nontrivial copy ctor.
> +  X x;
> +  int n;
> +};
> +int foo(C c) { return c.n; }
> +// CHECK-LABEL: define {{.*}} @_ZN28implicitly_deleted_copy_
> ctor3fooENS_1CE(%"union.implicitly_deleted_copy_ctor::C"*
> +// WIN64-LABEL: define {{.*}} @"\01?foo at implicitly_deleted_copy_ctor@
> @YAHTC at 1@@Z"(%"union.implicitly_deleted_copy_ctor::C"*
> +
> +struct D {
> +  D &operator=(const D&);
> +  // Passed indirect: copy ctor deleted due to variant member with
> nontrivial copy ctor.
> +  union {
> +    X x;
> +    int n;
> +  };
> +};
> +int foo(D d) { return d.n; }
> +// CHECK-LABEL: define {{.*}} @_ZN28implicitly_deleted_copy_
> ctor3fooENS_1DE(%"struct.implicitly_deleted_copy_ctor::D"*
> +// WIN64-LABEL: define {{.*}} @"\01?foo at implicitly_deleted_copy_ctor@
> @YAHUD at 1@@Z"(%"struct.implicitly_deleted_copy_ctor::D"*
> +
> +union E {
> +  // Passed direct: has non-deleted trivial copy ctor.
> +  E &operator=(const E&);
> +  Y y;
> +  int n;
> +};
> +int foo(E e) { return e.n; }
> +// CHECK-LABEL: define {{.*}} @_ZN28implicitly_deleted_copy_
> ctor3fooENS_1EE(i32
> +// WIN64-LABEL: define {{.*}} @"\01?foo at implicitly_deleted_copy_ctor@
> @YAHTE at 1@@Z"(i32
> +
> +struct F {
> +  // Passed direct: has non-deleted trivial copy ctor.
> +  F &operator=(const F&);
> +  union {
> +    Y y;
> +    int n;
> +  };
> +};
> +int foo(F f) { return f.n; }
> +// CHECK-LABEL: define {{.*}} @_ZN28implicitly_deleted_copy_
> ctor3fooENS_1FE(i32
> +// WIN64-LABEL: define {{.*}} @"\01?foo at implicitly_deleted_copy_ctor@
> @YAHUF at 1@@Z"(i32
> +}
>
> Modified: cfe/trunk/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/unittests/ASTMatchers/
> ASTMatchersNarrowingTest.cpp?rev=310401&r1=310400&r2=310401&view=diff
> ============================================================
> ==================
> --- cfe/trunk/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
> (original)
> +++ cfe/trunk/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp Tue Aug
> 8 12:12:28 2017
> @@ -1108,26 +1108,35 @@ TEST(ConstructorDeclaration, IsExplicit)
>  }
>
>  TEST(ConstructorDeclaration, Kinds) {
> -  EXPECT_TRUE(matches("struct S { S(); };",
> -                      cxxConstructorDecl(isDefaultConstructor())));
> -  EXPECT_TRUE(notMatches("struct S { S(); };",
> -                         cxxConstructorDecl(isCopyConstructor())));
> -  EXPECT_TRUE(notMatches("struct S { S(); };",
> -                         cxxConstructorDecl(isMoveConstructor())));
> +  EXPECT_TRUE(matches(
> +      "struct S { S(); };",
> +      cxxConstructorDecl(isDefaultConstructor(), unless(isImplicit()))));
> +  EXPECT_TRUE(notMatches(
> +      "struct S { S(); };",
> +      cxxConstructorDecl(isCopyConstructor(), unless(isImplicit()))));
> +  EXPECT_TRUE(notMatches(
> +      "struct S { S(); };",
> +      cxxConstructorDecl(isMoveConstructor(), unless(isImplicit()))));
>
> -  EXPECT_TRUE(notMatches("struct S { S(const S&); };",
> -                         cxxConstructorDecl(isDefaultConstructor())));
> -  EXPECT_TRUE(matches("struct S { S(const S&); };",
> -                      cxxConstructorDecl(isCopyConstructor())));
> -  EXPECT_TRUE(notMatches("struct S { S(const S&); };",
> -                         cxxConstructorDecl(isMoveConstructor())));
> +  EXPECT_TRUE(notMatches(
> +      "struct S { S(const S&); };",
> +      cxxConstructorDecl(isDefaultConstructor(), unless(isImplicit()))));
> +  EXPECT_TRUE(matches(
> +      "struct S { S(const S&); };",
> +      cxxConstructorDecl(isCopyConstructor(), unless(isImplicit()))));
> +  EXPECT_TRUE(notMatches(
> +      "struct S { S(const S&); };",
> +      cxxConstructorDecl(isMoveConstructor(), unless(isImplicit()))));
>
> -  EXPECT_TRUE(notMatches("struct S { S(S&&); };",
> -                         cxxConstructorDecl(isDefaultConstructor())));
> -  EXPECT_TRUE(notMatches("struct S { S(S&&); };",
> -                         cxxConstructorDecl(isCopyConstructor())));
> -  EXPECT_TRUE(matches("struct S { S(S&&); };",
> -                      cxxConstructorDecl(isMoveConstructor())));
> +  EXPECT_TRUE(notMatches(
> +      "struct S { S(S&&); };",
> +      cxxConstructorDecl(isDefaultConstructor(), unless(isImplicit()))));
> +  EXPECT_TRUE(notMatches(
> +      "struct S { S(S&&); };",
> +      cxxConstructorDecl(isCopyConstructor(), unless(isImplicit()))));
> +  EXPECT_TRUE(matches(
> +      "struct S { S(S&&); };",
> +      cxxConstructorDecl(isMoveConstructor(), unless(isImplicit()))));
>  }
>
>  TEST(ConstructorDeclaration, IsUserProvided) {
>
>
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