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authorShoaib Meenai <smeenai@fb.com>2016-09-19 18:29:07 +0000
committerShoaib Meenai <smeenai@fb.com>2016-09-19 18:29:07 +0000
commit190994e435884229ca058362e9974a5de4c41947 (patch)
tree9b04d11dc8bc301699d23abe99ebd450a513712c /libcxx
parent1197a1612d89c019ef67e43e15f45c7615b13b4d (diff)
downloadbcm5719-llvm-190994e435884229ca058362e9974a5de4c41947.tar.gz
bcm5719-llvm-190994e435884229ca058362e9974a5de4c41947.zip
[libc++] Fix extern template visibility for Windows
On Windows, marking an `extern template class` declaration as exported actually forces an instantiation, which is not the desired behavior. Instead, the actual explicit instantiations need to be exported. Differential Revision: https://reviews.llvm.org/D24679 llvm-svn: 281925
Diffstat (limited to 'libcxx')
-rw-r--r--libcxx/docs/DesignDocs/VisibilityMacros.rst20
-rw-r--r--libcxx/include/__config11
-rw-r--r--libcxx/src/ios.cpp18
-rw-r--r--libcxx/src/locale.cpp86
-rw-r--r--libcxx/src/string.cpp6
5 files changed, 85 insertions, 56 deletions
diff --git a/libcxx/docs/DesignDocs/VisibilityMacros.rst b/libcxx/docs/DesignDocs/VisibilityMacros.rst
index d6fdb287fdd..f7d1400341f 100644
--- a/libcxx/docs/DesignDocs/VisibilityMacros.rst
+++ b/libcxx/docs/DesignDocs/VisibilityMacros.rst
@@ -71,6 +71,26 @@ Visibility Macros
However since `_LIBCPP_TYPE_VIS_ONLY` is the same as `_LIBCPP_TYPE_VIS` the
visibility is already correct. The macro has an empty definition with GCC.
+ **Windows Behavior**: `extern template` and `dllexport` are fundamentally
+ incompatible *on a template class* on Windows; the former suppresses
+ instantiation, while the latter forces it. Specifying both on the same
+ declaration makes the template class be instantiated, which is not desirable
+ inside headers. This macro therefore expands to `dllimport` outside of libc++
+ but nothing inside of it (rather than expanding to `dllexport`); instead, the
+ explicit instantiations themselves are marked as exported. Note that this
+ applies *only* to extern template *classes*. Extern template *functions* obey
+ regular import/export semantics, and applying `dllexport` directly to the
+ extern template declaration is the correct thing to do for them.
+
+**_LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS**
+ Mark the member functions, typeinfo, and vtable of an explicit instantiation
+ of a class template as being exported by the libc++ library. This attribute
+ must be specified on all template class explicit instantiations.
+
+ It is only necessary to mark the explicit instantiation itself (as opposed to
+ the extern template declaration) as exported on Windows, as discussed above.
+ On all other platforms, this macro has an empty definition.
+
**_LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY**
Mark a member function of a class template as hidden and inline except when
building the libc++ library where it marks the symbol as being exported by
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 15e02d68325..86f945dc96b 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -551,15 +551,20 @@ namespace std {
// only really useful for a DLL. _LIBCPP_DLL should be a compiler builtin define ideally...
#if defined(_LIBCPP_DLL) && defined(cxx_EXPORTS)
# define _LIBCPP_DLL_VIS __declspec(dllexport)
+# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
+# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS
#elif defined(_LIBCPP_DLL)
# define _LIBCPP_DLL_VIS __declspec(dllimport)
+# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
+# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
#else
# define _LIBCPP_DLL_VIS
+# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
+# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
#endif
#define _LIBCPP_TYPE_VIS _LIBCPP_DLL_VIS
#define _LIBCPP_FUNC_VIS _LIBCPP_DLL_VIS
#define _LIBCPP_EXCEPTION_ABI _LIBCPP_DLL_VIS
-#define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
#define _LIBCPP_HIDDEN
#define _LIBCPP_TYPE_VIS_ONLY
#define _LIBCPP_FUNC_VIS_ONLY
@@ -619,6 +624,10 @@ namespace std {
# endif
#endif
+#ifndef _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
+# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
+#endif
+
#ifndef _LIBCPP_INLINE_VISIBILITY
#define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__visibility__("hidden"), __always_inline__))
#endif
diff --git a/libcxx/src/ios.cpp b/libcxx/src/ios.cpp
index 23e3ee0ca04..7c76ca258b2 100644
--- a/libcxx/src/ios.cpp
+++ b/libcxx/src/ios.cpp
@@ -25,19 +25,19 @@
_LIBCPP_BEGIN_NAMESPACE_STD
-template class basic_ios<char>;
-template class basic_ios<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ios<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ios<wchar_t>;
-template class basic_streambuf<char>;
-template class basic_streambuf<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_streambuf<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_streambuf<wchar_t>;
-template class basic_istream<char>;
-template class basic_istream<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istream<wchar_t>;
-template class basic_ostream<char>;
-template class basic_ostream<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<wchar_t>;
-template class basic_iostream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_iostream<char>;
class _LIBCPP_HIDDEN __iostream_category
: public __do_message
diff --git a/libcxx/src/locale.cpp b/libcxx/src/locale.cpp
index 12f05413c60..88c37312f01 100644
--- a/libcxx/src/locale.cpp
+++ b/libcxx/src/locale.cpp
@@ -6031,66 +6031,66 @@ void __throw_runtime_error(const char* msg)
#endif
}
-template class collate<char>;
-template class collate<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS collate<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS collate<wchar_t>;
-template class num_get<char>;
-template class num_get<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS num_get<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS num_get<wchar_t>;
-template struct __num_get<char>;
-template struct __num_get<wchar_t>;
+template struct _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __num_get<char>;
+template struct _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __num_get<wchar_t>;
-template class num_put<char>;
-template class num_put<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS num_put<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS num_put<wchar_t>;
-template struct __num_put<char>;
-template struct __num_put<wchar_t>;
+template struct _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __num_put<char>;
+template struct _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __num_put<wchar_t>;
-template class time_get<char>;
-template class time_get<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_get<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_get<wchar_t>;
-template class time_get_byname<char>;
-template class time_get_byname<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_get_byname<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_get_byname<wchar_t>;
-template class time_put<char>;
-template class time_put<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_put<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_put<wchar_t>;
-template class time_put_byname<char>;
-template class time_put_byname<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_put_byname<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS time_put_byname<wchar_t>;
-template class moneypunct<char, false>;
-template class moneypunct<char, true>;
-template class moneypunct<wchar_t, false>;
-template class moneypunct<wchar_t, true>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct<char, false>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct<char, true>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct<wchar_t, false>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct<wchar_t, true>;
-template class moneypunct_byname<char, false>;
-template class moneypunct_byname<char, true>;
-template class moneypunct_byname<wchar_t, false>;
-template class moneypunct_byname<wchar_t, true>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct_byname<char, false>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct_byname<char, true>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct_byname<wchar_t, false>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS moneypunct_byname<wchar_t, true>;
-template class money_get<char>;
-template class money_get<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS money_get<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS money_get<wchar_t>;
-template class __money_get<char>;
-template class __money_get<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __money_get<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __money_get<wchar_t>;
-template class money_put<char>;
-template class money_put<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS money_put<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS money_put<wchar_t>;
-template class __money_put<char>;
-template class __money_put<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __money_put<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __money_put<wchar_t>;
-template class messages<char>;
-template class messages<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS messages<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS messages<wchar_t>;
-template class messages_byname<char>;
-template class messages_byname<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS messages_byname<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS messages_byname<wchar_t>;
-template class codecvt_byname<char, char, mbstate_t>;
-template class codecvt_byname<wchar_t, char, mbstate_t>;
-template class codecvt_byname<char16_t, char, mbstate_t>;
-template class codecvt_byname<char32_t, char, mbstate_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<char, char, mbstate_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<wchar_t, char, mbstate_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<char16_t, char, mbstate_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS codecvt_byname<char32_t, char, mbstate_t>;
-template class __vector_base_common<true>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __vector_base_common<true>;
_LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/src/string.cpp b/libcxx/src/string.cpp
index 76d5caca549..cd644330b3a 100644
--- a/libcxx/src/string.cpp
+++ b/libcxx/src/string.cpp
@@ -20,10 +20,10 @@
_LIBCPP_BEGIN_NAMESPACE_STD
-template class __basic_string_common<true>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS __basic_string_common<true>;
-template class basic_string<char>;
-template class basic_string<wchar_t>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_string<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_string<wchar_t>;
template
string
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