Author: ed Date: Fri Dec 30 04:44:00 2016 New Revision: 290748 URL: http://llvm.org/viewvc/llvm-project?rev=290748&view=rev Log: Remove mblen(), mbtowc() and wctomb() from the thread-unsafe functions.
Back in r240527 I added a knob to prevent thread-unsafe functions from being exposed. mblen(), mbtowc() and wctomb() were also added to this list, as the latest issue of POSIX doesn't require these functions to be thread-safe. It turns out that the only circumstance in which these functions are not thread-safe is in case they are used in combination with state-dependent character sets (e.g., Shift-JIS). According to Austin Group Bug 708, these character sets "[...] are mostly a relic of the past and which were never supported on most POSIX systems". Though in many cases the use of these functions can be prevented by using the reentrant counterparts, they are the only functions that allow you to query whether the locale's character set is state-dependent. This means that omitting these functions removes actual functionality. Let's be a bit less pedantic and drop the guards around these functions. Links: http://austingroupbugs.net/view.php?id=708 http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2037.htm Reviewed by: ericwf Differential Revision: https://reviews.llvm.org/D21436 Modified: libcxx/trunk/include/__config libcxx/trunk/include/cstdlib libcxx/trunk/test/std/depr/depr.c.headers/stdlib_h.pass.cpp libcxx/trunk/test/std/language.support/support.runtime/cstdlib.pass.cpp Modified: libcxx/trunk/include/__config URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/__config?rev=290748&r1=290747&r2=290748&view=diff ============================================================================== --- libcxx/trunk/include/__config (original) +++ libcxx/trunk/include/__config Fri Dec 30 04:44:00 2016 @@ -917,7 +917,7 @@ _LIBCPP_FUNC_VIS extern "C" void __sanit #define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE #endif -// Thread-unsafe functions such as strtok(), mbtowc() and localtime() +// Thread-unsafe functions such as strtok() and localtime() // are not available. #ifdef __CloudABI__ #define _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS Modified: libcxx/trunk/include/cstdlib URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/cstdlib?rev=290748&r1=290747&r2=290748&view=diff ============================================================================== --- libcxx/trunk/include/cstdlib (original) +++ libcxx/trunk/include/cstdlib Fri Dec 30 04:44:00 2016 @@ -144,11 +144,9 @@ using ::ldiv; #ifndef _LIBCPP_HAS_NO_LONG_LONG using ::lldiv; #endif // _LIBCPP_HAS_NO_LONG_LONG -#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS using ::mblen; using ::mbtowc; using ::wctomb; -#endif using ::mbstowcs; using ::wcstombs; #ifdef _LIBCPP_HAS_QUICK_EXIT Modified: libcxx/trunk/test/std/depr/depr.c.headers/stdlib_h.pass.cpp URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/depr/depr.c.headers/stdlib_h.pass.cpp?rev=290748&r1=290747&r2=290748&view=diff ============================================================================== --- libcxx/trunk/test/std/depr/depr.c.headers/stdlib_h.pass.cpp (original) +++ libcxx/trunk/test/std/depr/depr.c.headers/stdlib_h.pass.cpp Fri Dec 30 04:44:00 2016 @@ -104,11 +104,9 @@ int main() wchar_t* pw = 0; const wchar_t* pwc = 0; char* pc = 0; -#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS static_assert((std::is_same<decltype(mblen("",0)), int>::value), ""); static_assert((std::is_same<decltype(mbtowc(pw,"",0)), int>::value), ""); static_assert((std::is_same<decltype(wctomb(pc,L' ')), int>::value), ""); -#endif static_assert((std::is_same<decltype(mbstowcs(pw,"",0)), size_t>::value), ""); static_assert((std::is_same<decltype(wcstombs(pc,pwc,0)), size_t>::value), ""); } Modified: libcxx/trunk/test/std/language.support/support.runtime/cstdlib.pass.cpp URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/language.support/support.runtime/cstdlib.pass.cpp?rev=290748&r1=290747&r2=290748&view=diff ============================================================================== --- libcxx/trunk/test/std/language.support/support.runtime/cstdlib.pass.cpp (original) +++ libcxx/trunk/test/std/language.support/support.runtime/cstdlib.pass.cpp Fri Dec 30 04:44:00 2016 @@ -96,11 +96,9 @@ int main() wchar_t* pw = 0; const wchar_t* pwc = 0; char* pc = 0; -#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS static_assert((std::is_same<decltype(std::mblen("",0)), int>::value), ""); static_assert((std::is_same<decltype(std::mbtowc(pw,"",0)), int>::value), ""); static_assert((std::is_same<decltype(std::wctomb(pc,L' ')), int>::value), ""); -#endif static_assert((std::is_same<decltype(std::mbstowcs(pw,"",0)), std::size_t>::value), ""); static_assert((std::is_same<decltype(std::wcstombs(pc,pwc,0)), std::size_t>::value), ""); } _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
