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Make the Parser independent from the global C-locale (#5028)

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* Make the Parser independent from the global C-locale

* Set a specific test locale using the environment variable FLATBUFFERS_TEST_LOCALE

* Remove redundant static qualifiers
This commit is contained in:
Vladimir Glavnyy
2018-11-17 00:24:06 +07:00
committed by Wouter van Oortmerssen
parent d6b1ce09cf
commit 5f32f94810
15 changed files with 480 additions and 277 deletions
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34
include/flatbuffers/base.h
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@@ -195,15 +195,35 @@
#endif
#endif // !FLATBUFFERS_HAS_NEW_STRTOD
// Suppress sanitizer directives.
#ifndef FLATBUFFERS_LOCALE_INDEPENDENT
// Enable locale independent functions {strtof_l, strtod_l,strtoll_l, strtoull_l}.
// They are part of the POSIX-2008 but not part of the C/C++ standard.
// GCC/Clang have definition (_XOPEN_SOURCE>=700) if POSIX-2008.
#if ((defined(_MSC_VER) && _MSC_VER >= 1800) || \
(defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE>=700)))
#define FLATBUFFERS_LOCALE_INDEPENDENT 1
#else
#define FLATBUFFERS_LOCALE_INDEPENDENT 0
#endif
#endif // !FLATBUFFERS_LOCALE_INDEPENDENT
// Suppress Undefined Behavior Sanitizer (recoverable only). Usage:
// - __supress_ubsan__("undefined")
// - __supress_ubsan__("signed-integer-overflow")
#if defined(__clang__)
#define __no_sanitize_undefined__(reason) __attribute__((no_sanitize("undefined")))
#define __supress_ubsan__(type) __attribute__((no_sanitize(type)))
#elif defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 408)
#define __no_sanitize_undefined__(reason) __attribute__((no_sanitize_undefined))
#define __supress_ubsan__(type) __attribute__((no_sanitize_undefined))
#else
#define __no_sanitize_undefined__(reason)
#define __supress_ubsan__(type)
#endif
// This is constexpr function used for checking compile-time constants.
// Avoid `#pragma warning(disable: 4127) // C4127: expression is constant`.
template<typename T> FLATBUFFERS_CONSTEXPR inline bool IsConstTrue(T t) {
return !!t;
}
/// @endcond
/// @file
@@ -287,13 +307,15 @@ template<typename T> T EndianScalar(T t) {
}
template<typename T>
__no_sanitize_undefined__("C++ aliasing type rules, see std::bit_cast<>")
// UBSAN: C++ aliasing type rules, see std::bit_cast<> for details.
__supress_ubsan__("alignment")
T ReadScalar(const void *p) {
return EndianScalar(*reinterpret_cast<const T *>(p));
}
template<typename T>
__no_sanitize_undefined__("C++ aliasing type rules, see std::bit_cast<>")
// UBSAN: C++ aliasing type rules, see std::bit_cast<> for details.
__supress_ubsan__("alignment")
void WriteScalar(void *p, T t) {
*reinterpret_cast<T *>(p) = EndianScalar(t);
}