[libcxx-commits] [libcxx] 997d41c - [libc++] Instantiate additional <iostream> members in the dylib
Louis Dionne via libcxx-commits
libcxx-commits at lists.llvm.org
Thu Nov 12 10:53:12 PST 2020
Author: Louis Dionne
Date: 2020-11-12T13:52:47-05:00
New Revision: 997d41cdec536a0b632505d9b0c4ab5dec5d7d12
URL: https://github.com/llvm/llvm-project/commit/997d41cdec536a0b632505d9b0c4ab5dec5d7d12
DIFF: https://github.com/llvm/llvm-project/commit/997d41cdec536a0b632505d9b0c4ab5dec5d7d12.diff
LOG: [libc++] Instantiate additional <iostream> members in the dylib
This commit adds new explicit instantiations for some classes in <iostream>
in the library. This is done after noticing that many programs that use
streams end up containing weak definitions of these classes, which has a
negative impact on both code size and load times (due to the need to
resolve weak symbols at load time). Note that we are just adding the
additional explicit instantiations for the `char` specializations, since
the `wchar_t` specializations are not used as often, and as a result there
wouldn't be a clear benefit.
This change is not an ABI break, since we are just adding additional
symbols.
Differential Revision: https://reviews.llvm.org/D90677
Added:
Modified:
libcxx/include/__config
libcxx/include/fstream
libcxx/include/sstream
libcxx/lib/abi/CHANGELOG.TXT
libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
libcxx/lib/abi/x86_64-unknown-linux-gnu.v1.abilist
libcxx/src/ios.instantiations.cpp
Removed:
################################################################################
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 4a1573087aa31..a85c074528a16 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -130,6 +130,13 @@
use _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR instead
#endif
+#if defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ABI_UNSTABLE) || _LIBCPP_ABI_VERSION >= 2
+// Enable additional explicit instantiations of iostreams components. This
+// reduces the number of weak definitions generated in programs that use
+// iostreams by providing a single strong definition in the shared library.
+# define _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1
+#endif
+
#define _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_X##_LIBCPP_Y
#define _LIBCPP_CONCAT(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y)
diff --git a/libcxx/include/fstream b/libcxx/include/fstream
index 98897f49866bb..1e2d6072e8fed 100644
--- a/libcxx/include/fstream
+++ b/libcxx/include/fstream
@@ -241,7 +241,7 @@ public:
return open(__p.c_str(), __mode);
}
#endif
- _LIBCPP_INLINE_VISIBILITY
+ inline _LIBCPP_INLINE_VISIBILITY
basic_filebuf* __open(int __fd, ios_base::openmode __mode);
#endif
basic_filebuf* close();
@@ -571,7 +571,8 @@ basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode)
}
template <class _CharT, class _Traits>
-_LIBCPP_INLINE_VISIBILITY basic_filebuf<_CharT, _Traits>*
+inline _LIBCPP_INLINE_VISIBILITY
+basic_filebuf<_CharT, _Traits>*
basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) {
basic_filebuf<_CharT, _Traits>* __rt = 0;
if (__file_ == 0) {
@@ -1757,6 +1758,12 @@ basic_fstream<_CharT, _Traits>::close()
this->setstate(ios_base::failbit);
}
+#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ifstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ofstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_filebuf<char>)
+#endif
+
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
diff --git a/libcxx/include/sstream b/libcxx/include/sstream
index 042766ca22c91..1439d9c4ab9c9 100644
--- a/libcxx/include/sstream
+++ b/libcxx/include/sstream
@@ -836,6 +836,13 @@ swap(basic_stringstream<_CharT, _Traits, _Allocator>& __x,
__x.swap(__y);
}
+#if defined(_LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringbuf<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_stringstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ostringstream<char>)
+_LIBCPP_EXTERN_TEMPLATE(class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istringstream<char>)
+#endif
+
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
diff --git a/libcxx/lib/abi/CHANGELOG.TXT b/libcxx/lib/abi/CHANGELOG.TXT
index ff6954ee76274..fe7817897d85b 100644
--- a/libcxx/lib/abi/CHANGELOG.TXT
+++ b/libcxx/lib/abi/CHANGELOG.TXT
@@ -16,7 +16,161 @@ New entries should be added directly below the "Version" header.
Version 12.0
------------
-* XXXXXXX - [libc++] Define new/delete in libc++abi only by default
+* XXXXXXX - [libc++] Instantiate additional <iostream> members in the dylib
+
+ This commit added new explicit instantiations for classes in <iostream> in
+ the library. This was done after noticing that many programs that used streams
+ ended up containing weak definitions of these classes, which has a negative
+ impact on both code size and load times. This change is not an ABI break,
+ since we are just adding additional symbols.
+
+ x86_64-apple-apple-darwin
+ -------------------------
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+ Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE11__read_modeEv
+ Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE12__write_modeEv
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+ Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4swapERS3_
+ Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4syncEv
+ Symbol added: __ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5closeEv
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+ Symbol added: __ZTVNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+
+ x86_64-unknown-linux-gnu
+ ------------------------
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+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE11__read_modeEv
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE12__write_modeEv
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4openEPKcj
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4swapERS3_
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE4syncEv
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5closeEv
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE5imbueERKNS_6localeE
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE6setbufEPcl
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekoffExNS_8ios_base7seekdirEj
+ Symbol added: _ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE7seekposENS_4fposI11__mbstate_tEEj
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+ Symbol added: _ZTTNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+ Symbol added: _ZTTNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+ Symbol added: _ZTTNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+ Symbol added: _ZTTNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+ Symbol added: _ZTVNSt3__113basic_filebufIcNS_11char_traitsIcEEEE
+ Symbol added: _ZTVNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE
+ Symbol added: _ZTVNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE
+ Symbol added: _ZTVNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+ Symbol added: _ZTVNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+ Symbol added: _ZTVNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+ Symbol added: _ZTVNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+
+* 9b40ee8eb0c1 - [libc++] Define new/delete in libc++abi only by default
By default, libc++ does not include the definition for new and delete anymore.
Those were previously defined in both libc++ and libc++abi, which was an
diff --git a/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist b/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
index f1bc473f1ba78..c9abbbef61959 100644
--- a/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
+++ b/libcxx/lib/abi/x86_64-apple-darwin.v1.abilist
@@ -495,6 +495,7 @@
{'is_defined': True, 'name': '__ZNKSt3__115__codecvt_utf16IwLb1EE9do_lengthER11__mbstate_tPKcS5_m', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNKSt3__115basic_streambufIcNS_11char_traitsIcEEE6getlocEv', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNKSt3__115basic_streambufIwNS_11char_traitsIwEEE6getlocEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE3strEv', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNKSt3__115error_condition7messageEv', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNKSt3__117moneypunct_bynameIcLb0EE11do_groupingEv', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNKSt3__117moneypunct_bynameIcLb0EE13do_neg_formatEv', 'type': 'FUNC'}
@@ -1084,6 +1085,26 @@
{'is_defined': True, 'name': '__ZNSt3__112system_errorD1Ev', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNSt3__112system_errorD2Ev', 'type': 'FUNC'}
{'is_defined': True, 'name': '__ZNSt3__113allocator_argE', 'size': 0, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE11__read_modeEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__113basic_filebufIcNS_11char_traitsIcEEE12__write_modeEv', 'type': 'FUNC'}
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+{'is_defined': True, 'name': '_ZTSNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE', 'size': 48, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__114basic_iostreamIcNS_11char_traitsIcEEEE', 'size': 48, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE', 'size': 48, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__114codecvt_bynameIDic11__mbstate_tEE', 'size': 43, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__114codecvt_bynameIDsc11__mbstate_tEE', 'size': 43, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__114codecvt_bynameIcc11__mbstate_tEE', 'size': 42, 'type': 'OBJECT'}
@@ -1723,6 +1777,7 @@
{'is_defined': True, 'name': '_ZTSNSt3__115__codecvt_utf16IwLb1EEE', 'size': 33, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__115basic_streambufIcNS_11char_traitsIcEEEE', 'size': 49, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__115basic_streambufIwNS_11char_traitsIwEEEE', 'size': 49, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 66, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__115messages_bynameIcEE', 'size': 29, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__115messages_bynameIwEE', 'size': 29, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__115numpunct_bynameIcEE', 'size': 29, 'type': 'OBJECT'}
@@ -1742,7 +1797,10 @@
{'is_defined': True, 'name': '_ZTSNSt3__117moneypunct_bynameIwLb1EEE', 'size': 35, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__118__time_get_storageIcEE', 'size': 32, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__118__time_get_storageIwEE', 'size': 32, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 69, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__119__shared_weak_countE', 'size': 30, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 70, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTSNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 70, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IDiEE', 'size': 35, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IDsEE', 'size': 35, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IwEE', 'size': 34, 'type': 'OBJECT'}
@@ -1795,7 +1853,12 @@
{'is_defined': True, 'name': '_ZTTNSt3__113basic_istreamIwNS_11char_traitsIwEEEE', 'size': 16, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTTNSt3__113basic_ostreamIcNS_11char_traitsIcEEEE', 'size': 16, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTTNSt3__113basic_ostreamIwNS_11char_traitsIwEEEE', 'size': 16, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE', 'size': 32, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTTNSt3__114basic_iostreamIcNS_11char_traitsIcEEEE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE', 'size': 32, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 80, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 32, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTTNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 32, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTTNSt3__19strstreamE', 'size': 80, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt12experimental15fundamentals_v112bad_any_castE', 'size': 40, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt12experimental19bad_optional_accessE', 'size': 40, 'type': 'OBJECT'}
@@ -1812,6 +1875,7 @@
{'is_defined': True, 'name': '_ZTVNSt3__112future_errorE', 'size': 40, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__112strstreambufE', 'size': 128, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__112system_errorE', 'size': 40, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__113basic_filebufIcNS_11char_traitsIcEEEE', 'size': 128, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__113basic_istreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__113basic_istreamIwNS_11char_traitsIwEEEE', 'size': 80, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__113basic_ostreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
@@ -1820,7 +1884,9 @@
{'is_defined': True, 'name': '_ZTVNSt3__114__codecvt_utf8IDsEE', 'size': 96, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__114__codecvt_utf8IwEE', 'size': 96, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__114__shared_countE', 'size': 40, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__114basic_ifstreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__114basic_iostreamIcNS_11char_traitsIcEEEE', 'size': 120, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__114basic_ofstreamIcNS_11char_traitsIcEEEE', 'size': 80, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__114codecvt_bynameIDic11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__114codecvt_bynameIDsc11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__114codecvt_bynameIcc11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
@@ -1836,6 +1902,7 @@
{'is_defined': True, 'name': '_ZTVNSt3__115__codecvt_utf16IwLb1EEE', 'size': 96, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__115basic_streambufIcNS_11char_traitsIcEEEE', 'size': 128, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__115basic_streambufIwNS_11char_traitsIwEEEE', 'size': 128, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 128, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__115messages_bynameIcEE', 'size': 64, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__115messages_bynameIwEE', 'size': 64, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__115numpunct_bynameIcEE', 'size': 80, 'type': 'OBJECT'}
@@ -1853,7 +1920,10 @@
{'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIcLb1EEE', 'size': 112, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIwLb0EEE', 'size': 112, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIwLb1EEE', 'size': 112, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 120, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__119__shared_weak_countE', 'size': 56, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 80, 'type': 'OBJECT'}
+{'is_defined': True, 'name': '_ZTVNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEE', 'size': 80, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IDiEE', 'size': 96, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IDsEE', 'size': 96, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IwEE', 'size': 96, 'type': 'OBJECT'}
diff --git a/libcxx/src/ios.instantiations.cpp b/libcxx/src/ios.instantiations.cpp
index 92704c6caf726..1a23687d128de 100644
--- a/libcxx/src/ios.instantiations.cpp
+++ b/libcxx/src/ios.instantiations.cpp
@@ -7,9 +7,11 @@
//===----------------------------------------------------------------------===//
#include "__config"
+#include "fstream"
#include "ios"
#include "istream"
#include "ostream"
+#include "sstream"
#include "streambuf"
@@ -26,6 +28,16 @@ template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<char>;
template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<wchar_t>;
template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_iostream<char>;
+// Additional instantiations added later. Whether programs rely on these being
+// available is protected by _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1.
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_stringbuf<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_stringstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostringstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istringstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ifstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ofstream<char>;
+template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_filebuf<char>;
+
// Add more here if needed...
_LIBCPP_END_NAMESPACE_STD
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