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gcc-toolset-11-gcc/SOURCES/gcc11-pr95048.patch

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commit d308b11fa94728507984b4ccc949219511273ab6
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Fri Nov 11 15:22:02 2022 +0000
libstdc++: Fix wstring conversions in filesystem::path [PR95048]
In commit r9-7381-g91756c4abc1757 I changed filesystem::path to use
std::codecvt<CharT, char, mbstate_t> for conversions from all wide
strings to UTF-8, instead of using std::codecvt_utf8<CharT>. This was
done because for 16-bit wchar_t, std::codecvt_utf8<wchar_t> only
supports UCS-2 and not UTF-16. The rationale for the change was sound,
but the actual fix was not. It's OK to use std::codecvt for char16_t or
char32_t, because the specializations for those types always use UTF-8 ,
but std::codecvt<wchar_t, char, mbstate_t> uses the current locale's
encodings, and the narrow encoding is probably ASCII and can't support
non-ASCII characters.
The correct fix is to use std::codecvt only for char16_t and char32_t.
For 32-bit wchar_t we could have continued using std::codecvt_utf8
because that uses UTF-32 which is fine, switching to std::codecvt broke
non-Windows targets with 32-bit wchar_t. For 16-bit wchar_t we did need
to change, but should have changed to std::codecvt_utf8_utf16<wchar_t>
instead, as that always uses UTF-16 not UCS-2. I actually noted that in
the commit message for r9-7381-g91756c4abc1757 but didn't use that
option. Oops.
This replaces the unconditional std::codecvt<CharT, char, mbstate_t>
with a type defined via template specialization, so it can vary
depending on the wide character type. The code is also simplified to
remove some of the mess of #ifdef and if-constexpr conditions.
libstdc++-v3/ChangeLog:
PR libstdc++/95048
* include/bits/fs_path.h (path::_Codecvt): New class template
that selects the kind of code conversion done.
(path::_Codecvt<wchar_t>): Select based on sizeof(wchar_t).
(_GLIBCXX_CONV_FROM_UTF8): New macro to allow the same code to
be used for Windows and POSIX.
(path::_S_convert(const EcharT*, const EcharT*)): Simplify by
using _Codecvt and _GLIBCXX_CONV_FROM_UTF8 abstractions.
(path::_S_str_convert(basic_string_view<value_type>, const A&)):
Simplify nested conditions.
* include/experimental/bits/fs_path.h (path::_Cvt): Define
nested typedef controlling type of code conversion done.
(path::_Cvt::_S_wconvert): Use new typedef.
(path::string(const A&)): Likewise.
* testsuite/27_io/filesystem/path/construct/95048.cc: New test.
* testsuite/experimental/filesystem/path/construct/95048.cc: New
test.
(cherry picked from commit b331bf303bdc1edead41e2b3d11d1a7804b433cf)
diff --git a/libstdc++-v3/include/bits/fs_path.h b/libstdc++-v3/include/bits/fs_path.h
index 1188e585b14..029a6f365b3 100644
--- a/libstdc++-v3/include/bits/fs_path.h
+++ b/libstdc++-v3/include/bits/fs_path.h
@@ -684,6 +684,8 @@ namespace __detail
_List _M_cmpts;
struct _Parser;
+
+ template<typename _EcharT> struct _Codecvt;
};
/// @{
@@ -811,55 +813,72 @@ namespace __detail
size_t _M_pos;
};
+ // path::_Codecvt<C> Performs conversions between C and path::string_type.
+ // The native encoding of char strings is the OS-dependent current
+ // encoding for pathnames. FIXME: We assume this is UTF-8 everywhere,
+ // but should use a Windows API to query it.
+
+ // Converts between native pathname encoding and char16_t or char32_t.
+ template<typename _EcharT>
+ struct path::_Codecvt
+ // Need derived class here because std::codecvt has protected destructor.
+ : std::codecvt<_EcharT, char, mbstate_t>
+ { };
+
+ // Converts between native pathname encoding and native wide encoding.
+ // The native encoding for wide strings is the execution wide-character
+ // set encoding. FIXME: We assume that this is either UTF-32 or UTF-16
+ // (depending on the width of wchar_t). That matches GCC's default,
+ // but can be changed with -fwide-exec-charset.
+ // We need a custom codecvt converting the native pathname encoding
+ // to/from the native wide encoding.
+ template<>
+ struct path::_Codecvt<wchar_t>
+ : conditional_t<sizeof(wchar_t) == sizeof(char32_t),
+ std::codecvt_utf8<wchar_t>, // UTF-8 <-> UTF-32
+ std::codecvt_utf8_utf16<wchar_t>> // UTF-8 <-> UTF-16
+ { };
+
template<typename _EcharT>
auto
path::_S_convert(const _EcharT* __f, const _EcharT* __l)
{
static_assert(__detail::__is_encoded_char<_EcharT>);
+#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+# define _GLIBCXX_CONV_FROM_UTF8(S) __detail::__wstr_from_utf8(S)
+#else
+# define _GLIBCXX_CONV_FROM_UTF8(S) S
+#endif
+
if constexpr (is_same_v<_EcharT, value_type>)
return basic_string_view<value_type>(__f, __l - __f);
-#if !defined _GLIBCXX_FILESYSTEM_IS_WINDOWS && defined _GLIBCXX_USE_CHAR8_T
+#ifdef _GLIBCXX_USE_CHAR8_T
else if constexpr (is_same_v<_EcharT, char8_t>)
- // For POSIX converting from char8_t to char is also 'noconv'
- return string_view(reinterpret_cast<const char*>(__f), __l - __f);
-#endif
- else
{
+ string_view __str(reinterpret_cast<const char*>(__f), __l - __f);
+ return _GLIBCXX_CONV_FROM_UTF8(__str);
+ }
+#endif
#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+ else if constexpr (is_same_v<_EcharT, char>)
+ {
std::wstring __wstr;
- if constexpr (is_same_v<_EcharT, char>)
- {
- struct _UCvt : std::codecvt<wchar_t, char, std::mbstate_t>
- { } __cvt;
- if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
- return __wstr;
- }
-#ifdef _GLIBCXX_USE_CHAR8_T
- else if constexpr (is_same_v<_EcharT, char8_t>)
- {
- const auto __f2 = reinterpret_cast<const char*>(__f);
- return __detail::__wstr_from_utf8(string_view(__f2, __l - __f));
- }
+ path::_Codecvt<wchar_t> __cvt;
+ if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
+ return __wstr;
+ }
#endif
- else // char16_t or char32_t
- {
- struct _UCvt : std::codecvt<_EcharT, char, std::mbstate_t>
- { } __cvt;
- std::string __str;
- if (__str_codecvt_out_all(__f, __l, __str, __cvt))
- return __detail::__wstr_from_utf8(__str);
- }
-#else // ! windows
- struct _UCvt : std::codecvt<_EcharT, char, std::mbstate_t>
- { } __cvt;
+ else
+ {
+ path::_Codecvt<_EcharT> __cvt;
std::string __str;
if (__str_codecvt_out_all(__f, __l, __str, __cvt))
- return __str;
-#endif
- __detail::__throw_conversion_error();
+ return _GLIBCXX_CONV_FROM_UTF8(__str);
}
+ __detail::__throw_conversion_error();
}
+#undef _GLIBCXX_CONV_FROM_UTF8
/// @endcond
@@ -1028,7 +1047,9 @@ namespace __detail
if (__str.size() == 0)
return _WString(__a);
-#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+#ifndef _GLIBCXX_FILESYSTEM_IS_WINDOWS
+ string_view __u8str = __str;
+#else
// First convert native string from UTF-16 to to UTF-8.
// XXX This assumes that the execution wide-character set is UTF-16.
std::codecvt_utf8_utf16<value_type> __cvt;
@@ -1038,35 +1059,30 @@ namespace __detail
_String __u8str{_CharAlloc{__a}};
const value_type* __wfirst = __str.data();
const value_type* __wlast = __wfirst + __str.size();
- if (__str_codecvt_out_all(__wfirst, __wlast, __u8str, __cvt)) {
+ if (!__str_codecvt_out_all(__wfirst, __wlast, __u8str, __cvt))
+ __detail::__throw_conversion_error();
if constexpr (is_same_v<_CharT, char>)
return __u8str; // XXX assumes native ordinary encoding is UTF-8.
- else {
-
- const char* __first = __u8str.data();
- const char* __last = __first + __u8str.size();
-#else
- const value_type* __first = __str.data();
- const value_type* __last = __first + __str.size();
-#endif
-
- // Convert UTF-8 string to requested format.
-#ifdef _GLIBCXX_USE_CHAR8_T
- if constexpr (is_same_v<_CharT, char8_t>)
- return _WString(__first, __last, __a);
else
#endif
{
- // Convert UTF-8 to wide string.
- _WString __wstr(__a);
- struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t> { } __cvt;
- if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
- return __wstr;
- }
+ const char* __first = __u8str.data();
+ const char* __last = __first + __u8str.size();
-#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
- } }
+ // Convert UTF-8 string to requested format.
+#ifdef _GLIBCXX_USE_CHAR8_T
+ if constexpr (is_same_v<_CharT, char8_t>)
+ return _WString(__first, __last, __a);
+ else
#endif
+ {
+ // Convert UTF-8 to wide string.
+ _WString __wstr(__a);
+ path::_Codecvt<_CharT> __cvt;
+ if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
+ return __wstr;
+ }
+ }
__detail::__throw_conversion_error();
}
/// @endcond
diff --git a/libstdc++-v3/include/experimental/bits/fs_path.h b/libstdc++-v3/include/experimental/bits/fs_path.h
index 830b51e45a0..65d63e433e0 100644
--- a/libstdc++-v3/include/experimental/bits/fs_path.h
+++ b/libstdc++-v3/include/experimental/bits/fs_path.h
@@ -748,15 +748,48 @@ namespace __detail
template<>
struct path::_Cvt<path::value_type>
{
+ // We need this type to be defined because we don't have `if constexpr`
+ // in C++11 and so path::string<C,T,A>(const A&) needs to be able to
+ // declare a variable of this type and pass it to __str_codecvt_in_all.
+ using __codecvt_utf8_to_wide = _Cvt;
+ // Dummy overload used for unreachable calls in path::string<C,T,A>.
+ template<typename _WStr>
+ friend bool
+ __str_codecvt_in_all(const char*, const char*,
+ _WStr&, __codecvt_utf8_to_wide&) noexcept
+ { return true; }
+
template<typename _Iter>
static string_type
_S_convert(_Iter __first, _Iter __last)
{ return string_type{__first, __last}; }
};
+ // Performs conversions from _CharT to path::string_type.
template<typename _CharT>
struct path::_Cvt
{
+ // FIXME: We currently assume that the native wide encoding for wchar_t
+ // is either UTF-32 or UTF-16 (depending on the width of wchar_t).
+ // See comments in <bits/fs_path.h> for further details.
+ using __codecvt_utf8_to_wchar
+ = typename conditional<sizeof(wchar_t) == sizeof(char32_t),
+ std::codecvt_utf8<wchar_t>, // from UTF-32
+ std::codecvt_utf8_utf16<wchar_t> // from UTF-16
+ >::type;
+
+ // Converts from char16_t or char32_t using std::codecvt<charNN_t, char>.
+ // Need derived class here because std::codecvt has protected destructor.
+ struct __codecvt_utf8_to_utfNN : std::codecvt<_CharT, char, mbstate_t>
+ { };
+
+ // Convert from native pathname format (assumed to be UTF-8 everywhere)
+ // to the encoding implied by the wide character type _CharT.
+ using __codecvt_utf8_to_wide
+ = typename conditional<is_same<_CharT, wchar_t>::value,
+ __codecvt_utf8_to_wchar,
+ __codecvt_utf8_to_utfNN>::type;
+
#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
#ifdef _GLIBCXX_USE_CHAR8_T
static string_type
@@ -774,8 +807,7 @@ namespace __detail
static string_type
_S_wconvert(const char* __f, const char* __l, const char*)
{
- using _Cvt = std::codecvt<wchar_t, char, mbstate_t>;
- const auto& __cvt = std::use_facet<_Cvt>(std::locale{});
+ std::codecvt_utf8_utf16<wchar_t> __cvt;
std::wstring __wstr;
if (__str_codecvt_in_all(__f, __l, __wstr, __cvt))
return __wstr;
@@ -787,8 +819,7 @@ namespace __detail
static string_type
_S_wconvert(const _CharT* __f, const _CharT* __l, const void*)
{
- struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t>
- { } __cvt;
+ __codecvt_utf8_to_wide __cvt;
std::string __str;
if (__str_codecvt_out_all(__f, __l, __str, __cvt))
{
@@ -819,8 +850,7 @@ namespace __detail
else
#endif
{
- struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t>
- { } __cvt;
+ __codecvt_utf8_to_wide __cvt;
std::string __str;
if (__str_codecvt_out_all(__f, __l, __str, __cvt))
return __str;
@@ -990,7 +1020,7 @@ namespace __detail
inline std::basic_string<_CharT, _Traits, _Allocator>
path::string(const _Allocator& __a) const
{
- if (is_same<_CharT, value_type>::value)
+ if _GLIBCXX_CONSTEXPR (is_same<_CharT, value_type>::value)
return { _M_pathname.begin(), _M_pathname.end(), __a };
using _WString = basic_string<_CharT, _Traits, _Allocator>;
@@ -1026,9 +1056,8 @@ namespace __detail
else
#endif
{
- // Convert UTF-8 to wide string.
- struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t>
- { } __cvt;
+ // Convert UTF-8 to char16_t or char32_t string.
+ typename path::_Cvt<_CharT>::__codecvt_utf8_to_wide __cvt;
const char* __f = __from.data();
const char* __l = __f + __from.size();
if (__str_codecvt_in_all(__f, __l, __to, __cvt))
@@ -1041,14 +1070,14 @@ namespace __detail
if (auto* __p = __dispatch(__u8str, __wstr, is_same<_CharT, char>{}))
return *__p;
}
-#else
+#else // ! Windows
#ifdef _GLIBCXX_USE_CHAR8_T
if constexpr (is_same<_CharT, char8_t>::value)
return _WString(__first, __last, __a);
else
#endif
{
- struct _UCvt : std::codecvt<_CharT, char, std::mbstate_t> { } __cvt;
+ typename path::_Cvt<_CharT>::__codecvt_utf8_to_wide __cvt;
_WString __wstr(__a);
if (__str_codecvt_in_all(__first, __last, __wstr, __cvt))
return __wstr;
diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/construct/95048.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/construct/95048.cc
new file mode 100644
index 00000000000..c1a382d1420
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/filesystem/path/construct/95048.cc
@@ -0,0 +1,45 @@
+// { dg-do run { target c++17 } }
+
+// C++17 30.10.8.4.1 path constructors [fs.path.construct]
+
+#include <filesystem>
+#include <testsuite_hooks.h>
+
+using std::filesystem::path;
+
+#define CHECK(E, S) (path(E##S) == path(u8##S))
+
+void
+test_wide()
+{
+ VERIFY( CHECK(L, "\u00E4") ); // PR libstdc++/95048
+ VERIFY( CHECK(L, "\U0001F4C1") ); // folder
+ VERIFY( CHECK(L, "\U0001F4C2") ); // open folder
+ VERIFY( CHECK(L, "\U0001F4C4") ); // filing cabient
+}
+
+void
+test_u16()
+{
+ VERIFY( CHECK(u, "\u00E4") ); // PR libstdc++/95048
+ VERIFY( CHECK(u, "\U0001F4C1") ); // folder
+ VERIFY( CHECK(u, "\U0001F4C2") ); // open folder
+ VERIFY( CHECK(u, "\U0001F4C4") ); // filing cabient
+}
+
+void
+test_u32()
+{
+ VERIFY( CHECK(U, "\u00E4") ); // PR libstdc++/95048
+ VERIFY( CHECK(U, "\U0001F4C1") ); // folder
+ VERIFY( CHECK(U, "\U0001F4C2") ); // open folder
+ VERIFY( CHECK(U, "\U0001F4C4") ); // filing cabient
+}
+
+int
+main()
+{
+ test_wide();
+ test_u16();
+ test_u32();
+}
diff --git a/libstdc++-v3/testsuite/experimental/filesystem/path/construct/95048.cc b/libstdc++-v3/testsuite/experimental/filesystem/path/construct/95048.cc
new file mode 100644
index 00000000000..b7a93f3c985
--- /dev/null
+++ b/libstdc++-v3/testsuite/experimental/filesystem/path/construct/95048.cc
@@ -0,0 +1,47 @@
+// { dg-options "-lstdc++fs" }
+// { dg-do run { target c++11 } }
+// { dg-require-filesystem-ts "" }
+
+// 8.4.1 path constructors [path.construct]
+
+#include <experimental/filesystem>
+#include <testsuite_hooks.h>
+
+using std::experimental::filesystem::path;
+
+#define CHECK(E, S) (path(E##S) == path(u8##S))
+
+void
+test_wide()
+{
+ VERIFY( CHECK(L, "\u00E4") ); // PR libstdc++/95048
+ VERIFY( CHECK(L, "\U0001F4C1") ); // folder
+ VERIFY( CHECK(L, "\U0001F4C2") ); // open folder
+ VERIFY( CHECK(L, "\U0001F4C4") ); // filing cabient
+}
+
+void
+test_u16()
+{
+ VERIFY( CHECK(u, "\u00E4") ); // PR libstdc++/95048
+ VERIFY( CHECK(u, "\U0001F4C1") ); // folder
+ VERIFY( CHECK(u, "\U0001F4C2") ); // open folder
+ VERIFY( CHECK(u, "\U0001F4C4") ); // filing cabient
+}
+
+void
+test_u32()
+{
+ VERIFY( CHECK(U, "\u00E4") ); // PR libstdc++/95048
+ VERIFY( CHECK(U, "\U0001F4C1") ); // folder
+ VERIFY( CHECK(U, "\U0001F4C2") ); // open folder
+ VERIFY( CHECK(U, "\U0001F4C4") ); // filing cabient
+}
+
+int
+main()
+{
+ test_wide();
+ test_u16();
+ test_u32();
+}
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