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[libc++] Fix iostream size ABI break (#185839)

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In #124103 we changed the size of various iostream objects, which turns
out to be ABI breaking when compiling non-PIE code.

This ABI break is safe to fix, since for any programs allocating more
memory for the iostream objects, the remaining bytes are simply unused
now.

Fixes #185724
This commit is contained in:
Nikolas Klauser
2026-03-12 10:18:25 +01:00
committed by GitHub
parent fc5e9bfb54
commit c1d26c3c25
6 changed files with 95 additions and 76 deletions
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16
libcxx/lib/abi/i686-linux-android21.libcxxabi.v1.stable.exceptions.nonew.abilist
View File

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16
libcxx/lib/abi/x86_64-linux-android21.libcxxabi.v1.stable.exceptions.nonew.abilist
View File

@@ -1226,7 +1226,7 @@
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16
libcxx/lib/abi/x86_64-unknown-freebsd.libcxxabi.v1.stable.exceptions.nonew.abilist
View File

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16
libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist
View File

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16
libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.noexceptions.nonew.abilist
View File

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{'is_defined': True, 'name': '_ZNSt3__14coutE', 'size': 160, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__14stodERKNS_12basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEEPm', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__14stodERKNS_12basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEEPm', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__14stofERKNS_12basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEEPm', 'type': 'FUNC'}
@@ -1288,7 +1288,7 @@
{'is_defined': True, 'name': '_ZNSt3__14stoiERKNS_12basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEEPmi', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__14stolERKNS_12basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEEPmi', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__14stolERKNS_12basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEEPmi', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__14wcinE', 'size': 280, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__14wcinE', 'size': 168, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__15alignEmmRPvRm', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__15ctypeIcE10table_sizeE', 'size': 8, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__15ctypeIcE13classic_tableEv', 'type': 'FUNC'}
@@ -1313,9 +1313,9 @@
{'is_defined': True, 'name': '_ZNSt3__15stollERKNS_12basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEEPmi', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__15stoulERKNS_12basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEEPmi', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__15stoulERKNS_12basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEEPmi', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__15wcerrE', 'size': 264, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__15wclogE', 'size': 264, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__15wcoutE', 'size': 264, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__15wcerrE', 'size': 160, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__15wclogE', 'size': 160, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__15wcoutE', 'size': 160, 'type': 'OBJECT'}
{'is_defined': True, 'name': '_ZNSt3__16__clocEv', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__16__itoa8__u32toaEjPc', 'type': 'FUNC'}
{'is_defined': True, 'name': '_ZNSt3__16__itoa8__u64toaEmPc', 'type': 'FUNC'}

91
libcxx/src/iostream.cpp
View File

@@ -16,24 +16,40 @@
_LIBCPP_BEGIN_NAMESPACE_STD
// This file implements the various stream objects provided inside <iostream>. We're doing some ODR violations in here,
// so this quite fragile. Specifically, the size of the stream objects (i.e. cout, cin etc.) needs to stay the same.
// For that reason, we have `stream` and `stream_data` separated into two objects. The public `stream` objects only
// contain the actual stream, while the private `stream_data` objects contains the `basic_streambuf` we're using as well
// as the mbstate_t. `stream_data` objects are only accessible within the library, so they aren't ABI sensitive and we
// can change them as we want.
template <class StreamT>
union stream {
constexpr stream() {}
stream(const stream&) = delete;
stream& operator=(const stream&) = delete;
constexpr ~stream() {}
StreamT value;
};
template <class StreamT, class BufferT>
union stream_data {
constexpr stream_data() {}
constexpr ~stream_data() {}
struct {
// The stream has to be the first element, since that's referenced by the stream declarations in <iostream>
StreamT stream;
BufferT buffer;
mbstate_t mb;
};
void init(FILE* stdstream) {
mb = {};
std::construct_at(&buffer, stdstream, &mb);
std::construct_at(&stream, &buffer);
}
};
template <class StreamT, class BufferT>
void init_stream(FILE* stdstream, stream<StreamT>& stream, stream_data<StreamT, BufferT>& data) {
data.mb = {};
std::construct_at(&data.buffer, stdstream, &data.mb);
std::construct_at(&stream.value, &data.buffer);
}
#define CHAR_MANGLING_char "D"
#define CHAR_MANGLING_wchar_t "_W"
#define CHAR_MANGLING(CharT) CHAR_MANGLING_##CharT
@@ -46,25 +62,28 @@ union stream_data {
#ifdef _LIBCPP_ABI_MICROSOFT
# define STREAM(StreamT, BufferT, CharT, var) \
STRING_DATA_CONSTINIT stream_data<StreamT<CharT>, BufferT<CharT>> var __asm__( \
STRING_DATA_CONSTINIT stream_data<StreamT<CharT>, BufferT<CharT>> var##_data; \
_LIBCPP_EXPORTED_FROM_ABI STRING_DATA_CONSTINIT stream<StreamT<CharT>> var __asm__( \
"?" #var "@" ABI_NAMESPACE_STR "@std@@3V?$" #StreamT \
"@" CHAR_MANGLING(CharT) "U?$char_traits@" CHAR_MANGLING(CharT) "@" ABI_NAMESPACE_STR "@std@@@12@A")
#else
# define STREAM(StreamT, BufferT, CharT, var) STRING_DATA_CONSTINIT stream_data<StreamT<CharT>, BufferT<CharT>> var
# define STREAM(StreamT, BufferT, CharT, var) \
STRING_DATA_CONSTINIT stream_data<StreamT<CharT>, BufferT<CharT>> var##_data; \
_LIBCPP_EXPORTED_FROM_ABI STRING_DATA_CONSTINIT stream<StreamT<CharT>> var
#endif
// These definitions and the declarations in <iostream> technically cause ODR violations, since they have different
// types (stream_data and {i,o}stream respectively). This means that <iostream> should never be included in this TU.
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_istream, __stdinbuf, char, cin);
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_ostream, __stdoutbuf, char, cout);
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_ostream, __stdoutbuf, char, cerr);
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_ostream, __stdoutbuf, char, clog);
STREAM(basic_istream, __stdinbuf, char, cin);
STREAM(basic_ostream, __stdoutbuf, char, cout);
STREAM(basic_ostream, __stdoutbuf, char, cerr);
STREAM(basic_ostream, __stdoutbuf, char, clog);
#if _LIBCPP_HAS_WIDE_CHARACTERS
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_istream, __stdinbuf, wchar_t, wcin);
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_ostream, __stdoutbuf, wchar_t, wcout);
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_ostream, __stdoutbuf, wchar_t, wcerr);
_LIBCPP_EXPORTED_FROM_ABI STREAM(basic_ostream, __stdoutbuf, wchar_t, wclog);
STREAM(basic_istream, __stdinbuf, wchar_t, wcin);
STREAM(basic_ostream, __stdoutbuf, wchar_t, wcout);
STREAM(basic_ostream, __stdoutbuf, wchar_t, wcerr);
STREAM(basic_ostream, __stdoutbuf, wchar_t, wclog);
#endif // _LIBCPP_HAS_WIDE_CHARACTERS
// Pretend we're inside a system header so the compiler doesn't flag the use of the init_priority
@@ -98,34 +117,34 @@ public:
DoIOSInit::DoIOSInit() {
force_locale_initialization();
cin.init(stdin);
cout.init(stdout);
cerr.init(stderr);
clog.init(stderr);
init_stream(stdin, cin, cin_data);
init_stream(stdout, cout, cout_data);
init_stream(stderr, cerr, cerr_data);
init_stream(stderr, clog, clog_data);
cin.stream.tie(&cout.stream);
std::unitbuf(cerr.stream);
cerr.stream.tie(&cout.stream);
cin.value.tie(&cout.value);
std::unitbuf(cerr.value);
cerr.value.tie(&cout.value);
#if _LIBCPP_HAS_WIDE_CHARACTERS
wcin.init(stdin);
wcout.init(stdout);
wcerr.init(stderr);
wclog.init(stderr);
init_stream(stdin, wcin, wcin_data);
init_stream(stdout, wcout, wcout_data);
init_stream(stderr, wcerr, wcerr_data);
init_stream(stderr, wclog, wclog_data);
wcin.stream.tie(&wcout.stream);
std::unitbuf(wcerr.stream);
wcerr.stream.tie(&wcout.stream);
wcin.value.tie(&wcout.value);
std::unitbuf(wcerr.value);
wcerr.value.tie(&wcout.value);
#endif
}
DoIOSInit::~DoIOSInit() {
cout.stream.flush();
clog.stream.flush();
cout.value.flush();
clog.value.flush();
#if _LIBCPP_HAS_WIDE_CHARACTERS
wcout.stream.flush();
wclog.stream.flush();
wcout.value.flush();
wclog.value.flush();
#endif
}