> On Apr 4, 2018, at 7:37 PM, Akira Hatanaka <ahatan...@apple.com> wrote: > > > >> On Apr 4, 2018, at 4:24 PM, Akira Hatanaka via cfe-commits >> <cfe-commits@lists.llvm.org <mailto:cfe-commits@lists.llvm.org>> wrote: >> >>> >>> On Apr 4, 2018, at 3:38 PM, Richard Smith <rich...@metafoo.co.uk >>> <mailto:rich...@metafoo.co.uk>> wrote: >>> >>> Hi Akira, >>> >>> This change has broken the C++ versions of these type traits for classes >>> with volatile members. Such classes are required to claim to be trivial per >>> C++ DR 2094 >>> (http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2094 >>> <http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2094>) but >>> return false from isNonTrivialToPrimitiveCopy(). >>> >> >> Oh that’s right. The function returns false when >> isNonTrivialToPrimitiveCopy() returns PCK_VolatileTrivial. That is wrong. >> >>> Also, exposing these __has_* traits more widely seems like a backwards step >>> to me: these traits are deprecated, near-useless, and we're trying to >>> remove them. No code should be using them under any circumstances; the >>> __is_* traits should be used instead. >>> >> >> The __is_* traits (is_trivially_copy_constructible, etc.) are templates >> defined in libcxx, so it seems that we can’t use them when compiling in C >> mode. Is it OK to add their definitions to TokenKinds.def as non-C++ >> keywords? >> > > Or perhaps redefine the six __has_* traits used here as non-C++ (KEYNOCXX or > ‘KEYC99 | KEYC11') keywords?
I think Richard is talking about e.g. the __is_trivially_destructible intrinsic type trait function rather than std::is_trivially_destructible. Do we have a concrete need to expose these type traits to C? John. > >>> On 27 March 2018 at 17:12, Akira Hatanaka via cfe-commits >>> <cfe-commits@lists.llvm.org <mailto:cfe-commits@lists.llvm.org>> wrote: >>> Author: ahatanak >>> Date: Tue Mar 27 17:12:08 2018 >>> New Revision: 328680 >>> >>> URL: http://llvm.org/viewvc/llvm-project?rev=328680&view=rev >>> <http://llvm.org/viewvc/llvm-project?rev=328680&view=rev> >>> Log: >>> [ObjC] Make C++ triviality type traits available to non-trivial C >>> structs. >>> >>> r326307 and r327870 made changes that allowed using non-trivial C >>> structs with fields qualified with __strong or __weak. This commit makes >>> the following C++ triviality type traits available to non-trivial C >>> structs: >>> >>> __has_trivial_assign >>> __has_trivial_move_assign >>> __has_trivial_copy >>> __has_trivial_move_constructor >>> __has_trivial_constructor >>> __has_trivial_destructor >>> >>> rdar://problem/33599681 <rdar://problem/33599681> >>> >>> Differential Revision: https://reviews.llvm.org/D44913 >>> <https://reviews.llvm.org/D44913> >>> >>> Added: >>> cfe/trunk/test/SemaObjC/non-trivial-struct-traits.m >>> Modified: >>> cfe/trunk/include/clang/Basic/TokenKinds.def >>> cfe/trunk/lib/Sema/SemaExprCXX.cpp >>> >>> Modified: cfe/trunk/include/clang/Basic/TokenKinds.def >>> URL: >>> http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/TokenKinds.def?rev=328680&r1=328679&r2=328680&view=diff >>> >>> <http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/TokenKinds.def?rev=328680&r1=328679&r2=328680&view=diff> >>> ============================================================================== >>> --- cfe/trunk/include/clang/Basic/TokenKinds.def (original) >>> +++ cfe/trunk/include/clang/Basic/TokenKinds.def Tue Mar 27 17:12:08 2018 >>> @@ -433,12 +433,12 @@ TYPE_TRAIT_1(__has_nothrow_assign, HasNo >>> TYPE_TRAIT_1(__has_nothrow_move_assign, HasNothrowMoveAssign, KEYCXX) >>> TYPE_TRAIT_1(__has_nothrow_copy, HasNothrowCopy, KEYCXX) >>> TYPE_TRAIT_1(__has_nothrow_constructor, HasNothrowConstructor, KEYCXX) >>> -TYPE_TRAIT_1(__has_trivial_assign, HasTrivialAssign, KEYCXX) >>> -TYPE_TRAIT_1(__has_trivial_move_assign, HasTrivialMoveAssign, KEYCXX) >>> -TYPE_TRAIT_1(__has_trivial_copy, HasTrivialCopy, KEYCXX) >>> -TYPE_TRAIT_1(__has_trivial_constructor, HasTrivialDefaultConstructor, >>> KEYCXX) >>> -TYPE_TRAIT_1(__has_trivial_move_constructor, HasTrivialMoveConstructor, >>> KEYCXX) >>> -TYPE_TRAIT_1(__has_trivial_destructor, HasTrivialDestructor, KEYCXX) >>> +TYPE_TRAIT_1(__has_trivial_assign, HasTrivialAssign, KEYALL) >>> +TYPE_TRAIT_1(__has_trivial_move_assign, HasTrivialMoveAssign, KEYALL) >>> +TYPE_TRAIT_1(__has_trivial_copy, HasTrivialCopy, KEYALL) >>> +TYPE_TRAIT_1(__has_trivial_constructor, HasTrivialDefaultConstructor, >>> KEYALL) >>> +TYPE_TRAIT_1(__has_trivial_move_constructor, HasTrivialMoveConstructor, >>> KEYALL) >>> +TYPE_TRAIT_1(__has_trivial_destructor, HasTrivialDestructor, KEYALL) >>> TYPE_TRAIT_1(__has_virtual_destructor, HasVirtualDestructor, KEYCXX) >>> TYPE_TRAIT_1(__is_abstract, IsAbstract, KEYCXX) >>> TYPE_TRAIT_1(__is_aggregate, IsAggregate, KEYCXX) >>> >>> Modified: cfe/trunk/lib/Sema/SemaExprCXX.cpp >>> URL: >>> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaExprCXX.cpp?rev=328680&r1=328679&r2=328680&view=diff >>> >>> <http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaExprCXX.cpp?rev=328680&r1=328679&r2=328680&view=diff> >>> ============================================================================== >>> --- cfe/trunk/lib/Sema/SemaExprCXX.cpp (original) >>> +++ cfe/trunk/lib/Sema/SemaExprCXX.cpp Tue Mar 27 17:12:08 2018 >>> @@ -4513,6 +4513,8 @@ static bool EvaluateUnaryTypeTrait(Sema >>> // does not correctly compute triviality in the presence of multiple >>> special >>> // members of the same kind. Revisit this once the g++ bug is fixed. >>> case UTT_HasTrivialDefaultConstructor: >>> + if (T.isNonTrivialToPrimitiveDefaultInitialize()) >>> + return false; >>> // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html >>> <http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html>: >>> // If __is_pod (type) is true then the trait is true, else if type is >>> // a cv class or union type (or array thereof) with a trivial default >>> @@ -4524,6 +4526,8 @@ static bool EvaluateUnaryTypeTrait(Sema >>> !RD->hasNonTrivialDefaultConstructor(); >>> return false; >>> case UTT_HasTrivialMoveConstructor: >>> + if (T.isNonTrivialToPrimitiveDestructiveMove()) >>> + return false; >>> // This trait is implemented by MSVC 2012 and needed to parse the >>> // standard library headers. Specifically this is used as the logic >>> // behind std::is_trivially_move_constructible (20.9.4.3). >>> @@ -4533,6 +4537,8 @@ static bool EvaluateUnaryTypeTrait(Sema >>> return RD->hasTrivialMoveConstructor() && >>> !RD->hasNonTrivialMoveConstructor(); >>> return false; >>> case UTT_HasTrivialCopy: >>> + if (T.isNonTrivialToPrimitiveCopy()) >>> + return false; >>> // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html >>> <http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html>: >>> // If __is_pod (type) is true or type is a reference type then >>> // the trait is true, else if type is a cv class or union type >>> @@ -4545,6 +4551,8 @@ static bool EvaluateUnaryTypeTrait(Sema >>> !RD->hasNonTrivialCopyConstructor(); >>> return false; >>> case UTT_HasTrivialMoveAssign: >>> + if (T.isNonTrivialToPrimitiveDestructiveMove()) >>> + return false; >>> // This trait is implemented by MSVC 2012 and needed to parse the >>> // standard library headers. Specifically it is used as the logic >>> // behind std::is_trivially_move_assignable (20.9.4.3) >>> @@ -4554,6 +4562,8 @@ static bool EvaluateUnaryTypeTrait(Sema >>> return RD->hasTrivialMoveAssignment() && >>> !RD->hasNonTrivialMoveAssignment(); >>> return false; >>> case UTT_HasTrivialAssign: >>> + if (T.isNonTrivialToPrimitiveCopy()) >>> + return false; >>> // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html >>> <http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html>: >>> // If type is const qualified or is a reference type then the >>> // trait is false. Otherwise if __is_pod (type) is true then the >>> @@ -4624,6 +4634,8 @@ static bool EvaluateUnaryTypeTrait(Sema >>> return true; >>> >>> case UTT_HasTrivialDestructor: >>> + if (T.isDestructedType() == QualType::DK_nontrivial_c_struct) >>> + return false; >>> // http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html >>> <http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html> >>> // If __is_pod (type) is true or type is a reference type >>> // then the trait is true, else if type is a cv class or union >>> >>> Added: cfe/trunk/test/SemaObjC/non-trivial-struct-traits.m >>> URL: >>> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjC/non-trivial-struct-traits.m?rev=328680&view=auto >>> >>> <http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaObjC/non-trivial-struct-traits.m?rev=328680&view=auto> >>> ============================================================================== >>> --- cfe/trunk/test/SemaObjC/non-trivial-struct-traits.m (added) >>> +++ cfe/trunk/test/SemaObjC/non-trivial-struct-traits.m Tue Mar 27 17:12:08 >>> 2018 >>> @@ -0,0 +1,25 @@ >>> +// RUN: %clang_cc1 -fsyntax-only -fobjc-arc -verify %s >>> + >>> +// expected-no-diagnostics >>> + >>> +struct Trivial { >>> + int x; >>> +}; >>> + >>> +struct NonTrivial { >>> + id x; >>> +}; >>> + >>> +int trivial_assign[__has_trivial_assign(struct Trivial) ? 1 : -1]; >>> +int trivial_move_assign[__has_trivial_move_assign(struct Trivial) ? 1 : >>> -1]; >>> +int trivial_copy_constructor[__has_trivial_copy(struct Trivial) ? 1 : -1]; >>> +int trivial_move_constructor[__has_trivial_move_constructor(struct >>> Trivial) ? 1 : -1]; >>> +int trivial_constructor[__has_trivial_constructor(struct Trivial) ? 1 : >>> -1]; >>> +int trivial_destructor[__has_trivial_destructor(struct Trivial) ? 1 : -1]; >>> + >>> +int non_trivial_assign[__has_trivial_assign(struct NonTrivial) ? -1 : 1]; >>> +int non_trivial_move_assign[__has_trivial_move_assign(struct NonTrivial) ? >>> -1 : 1]; >>> +int non_trivial_copy_constructor[__has_trivial_copy(struct NonTrivial) ? >>> -1 : 1]; >>> +int non_trivial_move_constructor[__has_trivial_move_constructor(struct >>> NonTrivial) ? -1 : 1]; >>> +int non_trivial_constructor[__has_trivial_constructor(struct NonTrivial) ? >>> -1 : 1]; >>> +int non_trivial_destructor[__has_trivial_destructor(struct NonTrivial) ? >>> -1 : 1]; >>> >>> >>> _______________________________________________ >>> cfe-commits mailing list >>> cfe-commits@lists.llvm.org <mailto:cfe-commits@lists.llvm.org> >>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits >>> <http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits> >>> >> >> _______________________________________________ >> cfe-commits mailing list >> cfe-commits@lists.llvm.org <mailto:cfe-commits@lists.llvm.org> >> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits >> <http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits>
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