[libc++] Add the _LIBCPP_HIDE_FROM_ABI_AFTER_V1 macro

[ldionne]

Summary

This macro allows hiding symbols from the ABI when the library is built
with an ABI version after ABI v1, which is currently the only stable ABI.
This commit defines _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY to be
_LIBCPP_HIDE_FROM_ABI_AFTER_V1, meaning that symbols that were only
exported by the library for historical reasons are not exported anymore
in the unstable ABI.

Because of that, this commit is an ABI break for ABI v2. This ABI version
is not stable, however, so this should not be a problem.

[ldionne]

This is the second step of the proposal aiming to remove uses of __always_inline__ in the visibility macros. This proposal is documented on the list here: http://lists.llvm.org/pipermail/cfe-dev/2018-July/058633.html

[ldionne]

Document the macro in the official documentation instead of the header, per
Eric's comment on a previous patch of mine.

[dexonsmith]

This looks correct to me, but I wouldn't mind having someone else take a look too.

libcxx/include/__config

798–811

It looks like if you switch this to #if !defined(...) you can use #elif instead of a nested #if. I think that would make the logic a bit more clear for me, but if you disagree feel free to leave it as is.

[ldionne]

libcxx/include/__config

798–811

The reason I did it that way is that this structure will make it easier to add new versions in the future:

#ifdef _LIBCPP_BUILDING_LIBRARY
#  if _LIBCPP_ABI_VERSION > 1
#    define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
#  else
#    define _LIBCPP_HIDE_FROM_ABI_AFTER_V1
#  endif

#  if _LIBCPP_ABI_VERSION > 2
#    define _LIBCPP_HIDE_FROM_ABI_AFTER_V2 _LIBCPP_HIDE_FROM_ABI
#  else
#    define _LIBCPP_HIDE_FROM_ABI_AFTER_V2
#  endif

#else
#  define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
#  define _LIBCPP_HIDE_FROM_ABI_AFTER_V2 _LIBCPP_HIDE_FROM_ABI
#endif

With your suggestion, the case where we have only one ABI version is indeed clearer, but it's not as easy to add a new version (remember than if the version is 2, both _LIBCPP_HIDE_FROM_ABI_AFTER_V1 and _LIBCPP_HIDE_FROM_ABI_AFTER_V2 would need to be defined, so an elif chain does not cut it):

// Hide symbols when we're not building the dylib
#if !defined(_LIBCPP_BUILDING_LIBRARY)
#  define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
// Otherwise, hide symbols depending on the ABI version used to build the dylib
#elif _LIBCPP_ABI_VERSION > 1
#  define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
#else
#  define _LIBCPP_HIDE_FROM_ABI_AFTER_V1
#endif

This basically needs to turn into what I've put above if we are to add a new ABI version.

[mclow.lists]

This LGTM, but suggests another cleanup.

We have a bunch of _LIBCPP_BUILDING_XXX macros defined in libcxx/src - do we need them any more now that we have _LIBCPP_BUILDING_LIBRARY?

src/bind.cpp:10: #define _LIBCPP_BUILDING_BIND
src/memory.cpp:10: #define _LIBCPP_BUILDING_MEMORY
src/mutex.cpp:10: #define _LIBCPP_BUILDING_MUTEX
src/new.cpp:10: #define _LIBCPP_BUILDING_NEW
src/shared_mutex.cpp:13: #define _LIBCPP_BUILDING_SHARED_MUTEX
src/system_error.cpp:12: #define _LIBCPP_BUILDING_SYSTEM_ERROR
src/utility.cpp:10: #define _LIBCPP_BUILDING_UTILITY

I can take care of this post-branch for release.

libcxx/docs/DesignDocs/VisibilityMacros.rst

**_LIBCPP_OVERRIDABLE_FUNC_VIS**
   library and has an empty definition otherwise.
 
 **_LIBCPP_HIDE_FROM_ABI**
   Mark a function as not being part of the ABI of any final linked image that
   uses it, and also as being internal to each TU that uses that function. In
   other words, the address of a function marked with this attribute is not
   guaranteed to be the same across translation units.
 
+**_LIBCPP_HIDE_FROM_ABI_AFTER_V1**
+  Mark a function as being hidden from the ABI (per `_LIBCPP_HIDE_FROM_ABI`)
+  when libc++ is built with an ABI version after ABI v1. This macro is used to
+  maintain ABI compatibility for symbols that have been historically exported
+  by libc++ in v1 of the ABI, but we don't want to export in the future.
+
 **_LIBCPP_TYPE_VIS**
   Mark a type's typeinfo, vtable and members as having default visibility.
   This attribute cannot be used on class templates.
 
 **_LIBCPP_TEMPLATE_VIS**
   Mark a type's typeinfo and vtable as having default visibility.
   This macro has no effect on the visibility of the type's member functions.
 
**_LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS**
 
   Consequently, all such problematic method templates are explicitly marked
   either hidden (via this macro) or inline, so that they don't leak into client
   libraries. The problematic methods were found by running
   `bad-visibility-finder <https://github.com/smeenai/bad-visibility-finder>`_
   against the libc++ headers after making `_LIBCPP_TYPE_VIS` and
   `_LIBCPP_EXTERN_TEMPLATE_TYPE_VIS` expand to default visibility.
 
-**_LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY**
-  Mark a member function of a class template as visible and always inline. This
-  macro should only be applied to member functions of class templates that are
-  externally instantiated. It is important that these symbols are not marked
-  as hidden as that will prevent the dylib definition from being found.
-
-  This macro is used to maintain ABI compatibility for symbols that have been
-  historically exported by the libc++ library but are now marked inline.
-
 **_LIBCPP_EXCEPTION_ABI**
   Mark the member functions, typeinfo, and vtable of the type as being exported
   by the libc++ library. This macro must be applied to all *exception types*.
   Exception types should be defined directly in namespace `std` and not the
   versioning namespace. This allows throwing and catching some exception types
   between libc++ and libstdc++.
 
 **_LIBCPP_INTERNAL_LINKAGE**

libcxx/include/__config

 #define _LIBCPP_FUNC_VIS            _LIBCPP_DLL_VIS
 #define _LIBCPP_EXTERN_VIS          _LIBCPP_DLL_VIS
 #define _LIBCPP_EXCEPTION_ABI       _LIBCPP_DLL_VIS
 #define _LIBCPP_HIDDEN
 #define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
 #define _LIBCPP_TEMPLATE_VIS
 #define _LIBCPP_ENUM_VIS
 
-#if defined(_LIBCPP_COMPILER_MSVC)
-#  define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __forceinline
-#else
-#  define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__ ((__always_inline__))
-#endif
-
 #endif // defined(_LIBCPP_OBJECT_FORMAT_COFF)
 
 #ifndef _LIBCPP_HIDDEN
 #  if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
 #    define _LIBCPP_HIDDEN __attribute__ ((__visibility__("hidden")))
 #  else
 #    define _LIBCPP_HIDDEN
 #  endif

 #else
 #  define _LIBCPP_INTERNAL_LINKAGE _LIBCPP_ALWAYS_INLINE
 #endif
 
 #ifndef _LIBCPP_HIDE_FROM_ABI
 #  define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_INTERNAL_LINKAGE
 #endif
 
-// Just so we can migrate to _LIBCPP_HIDE_FROM_ABI gradually.
-#define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI
-
-#ifndef _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
-#  if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
-#    define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__visibility__("default"), __always_inline__))
+// _LIBCPP_HIDE_FROM_ABI_AFTER_XXX controls whether a symbol is part of the ABI
+// based on the ABI version used to build libc++. When we build libc++, we either
+// hide the symbol from the ABI (if the symbol is not part of the ABI in the
+// version we're building), or we leave it included. Elsewhere, when we're not
+// building libc++, we always mark those symbols as internal so that programs
+// built using new libc++ headers stop relying on symbols that are removed from
+// the ABI in a future version.
+//
+// Each time we release a new stable version of the ABI, we should create a new
+// _LIBCPP_HIDE_FROM_ABI_AFTER_XXX macro, and we can use it to start removing
+// symbols from the ABI after that stable version.
+#ifdef _LIBCPP_BUILDING_LIBRARY
+#  if _LIBCPP_ABI_VERSION > 1
+#    define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
 #  else
-#    define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__always_inline__))
+#    define _LIBCPP_HIDE_FROM_ABI_AFTER_V1
 #  endif
+#else
+#  define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
 #endif
 
+// Just so we can migrate to the new macros gradually.
+#define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI
+#define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI_AFTER_V1
+
 #ifndef _LIBCPP_PREFERRED_OVERLOAD
 #  if __has_attribute(__enable_if__)
 #    define _LIBCPP_PREFERRED_OVERLOAD __attribute__ ((__enable_if__(true, "")))
 #  endif
 #endif
 
 #ifndef _LIBCPP_HAS_NO_NOEXCEPT
 #  define _NOEXCEPT noexcept

libcxx/lib/abi/x86_64-apple-darwin.v2.abilist

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