+
+/* The character set for the regex is stored in a field of more than one bit
+ * using an enum, for reasons of compactness and to ensure that the options are
+ * mutually exclusive */
+/* Make sure to update ext/re/re.pm when changing this! */
+typedef enum {
+ REGEX_DEPENDS_CHARSET = 0,
+ REGEX_LOCALE_CHARSET,
+ REGEX_UNICODE_CHARSET,
+ REGEX_ASCII_RESTRICTED_CHARSET,
+ REGEX_ASCII_MORE_RESTRICTED_CHARSET
+} regex_charset;
+
+#define _RXf_PMf_CHARSET_SHIFT ((RXf_PMf_STD_PMMOD_SHIFT)+5)
+#define RXf_PMf_CHARSET (7 << (_RXf_PMf_CHARSET_SHIFT)) /* 3 bits */
+
+/* embed.pl doesn't yet know how to handle static inline functions, so
+ manually decorate them here with gcc-style attributes.
+*/
+PERL_STATIC_INLINE void
+set_regex_charset(U32 * const flags, const regex_charset cs)
+ __attribute__nonnull__(1);
+
+PERL_STATIC_INLINE void
+set_regex_charset(U32 * const flags, const regex_charset cs)
+{
+ /* Sets the character set portion of 'flags' to 'cs', which is a member of
+ * the above enum */
+
+ *flags &= ~RXf_PMf_CHARSET;
+ *flags |= (cs << _RXf_PMf_CHARSET_SHIFT);
+}
+
+PERL_STATIC_INLINE regex_charset
+get_regex_charset(const U32 flags)
+ __attribute__warn_unused_result__;
+
+PERL_STATIC_INLINE regex_charset
+get_regex_charset(const U32 flags)
+{
+ /* Returns the enum corresponding to the character set in 'flags' */
+
+ return (regex_charset) ((flags & RXf_PMf_CHARSET) >> _RXf_PMf_CHARSET_SHIFT);
+}