X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/3214c85f0cf79132ec9bd3848fbc74923594dc83..49bb71aec3ca9a185f018c6b8f85bad3580522af:/op_reg_common.h

diff --git a/op_reg_common.h b/op_reg_common.h
index de100dc..8a45b20 100644
--- a/op_reg_common.h
+++ b/op_reg_common.h
@@ -2,7 +2,7 @@
  *
  *    Definitions common to by op.h and regexp.h
  *
- *    Copyright (C) 2010 by Larry Wall and others
+ *    Copyright (C) 2010, 2011 by Larry Wall and others
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -10,20 +10,107 @@
  */
 
 /* These defines are used in both op.h and regexp.h  The definitions use the
- * shift form so that ext/B/defsubs_h.PL will pick them up */
-#define RXf_PMf_MULTILINE	(1 << 0)	/* /m */
-#define PMf_MULTILINE	        (1 << 0)	/* /m */
-#define RXf_PMf_SINGLELINE	(1 << 1)	/* /s */
-#define PMf_SINGLELINE	        (1 << 1)	/* /s */
-#define RXf_PMf_FOLD	        (1 << 2)	/* /i */
-#define PMf_FOLD	        (1 << 2)	/* /i */
-#define RXf_PMf_EXTENDED	(1 << 3)	/* /x */
-#define PMf_EXTENDED	        (1 << 3)	/* /x */
-#define RXf_PMf_KEEPCOPY	(1 << 4)	/* /p */
-#define PMf_KEEPCOPY	        (1 << 4)	/* /p */
-#define RXf_PMf_LOCALE		(1 << 5)
-#define PMf_LOCALE		(1 << 5)
+ * shift form so that ext/B/defsubs_h.PL will pick them up.
+ *
+ * Data structures used in the two headers have common fields, and in fact one
+ * is copied onto the other.  This makes it easy to keep them in sync */
+
+/* This tells where the first of these bits is.  Setting it to 0 saved cycles
+ * and memory.  I (khw) think the code will work if changed back, but haven't
+ * tested it */
+/* Make sure to update ext/re/re.pm when changing this! */
+#ifndef RXf_PMf_STD_PMMOD_SHIFT /* Only expand #include of this file once */
+
+#define RXf_PMf_STD_PMMOD_SHIFT 0
+
+/* The bits need to be ordered so that the msix are contiguous starting at bit
+ * RXf_PMf_STD_PMMOD_SHIFT, followed by the p.  See STD_PAT_MODS and
+ * INT_PAT_MODS in regexp.h for the reason contiguity is needed */
+/* Make sure to update lib/re.pm when changing these! */
+#define RXf_PMf_MULTILINE      (1 << (RXf_PMf_STD_PMMOD_SHIFT+0))    /* /m */
+#define RXf_PMf_SINGLELINE     (1 << (RXf_PMf_STD_PMMOD_SHIFT+1))    /* /s */
+#define RXf_PMf_FOLD           (1 << (RXf_PMf_STD_PMMOD_SHIFT+2))    /* /i */
+#define RXf_PMf_EXTENDED       (1 << (RXf_PMf_STD_PMMOD_SHIFT+3))    /* /x */
+#define RXf_PMf_KEEPCOPY       (1 << (RXf_PMf_STD_PMMOD_SHIFT+4))    /* /p */
+
+/* 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 and regcomp.sym (as these are used as
+ * offsets for various node types, like SPACE vs SPACEL, etc) 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 */
+
+/* Manually decorate these functions here with gcc-style attributes just to
+ * avoid making the regex_charset typedef global, which it would need to be for
+ * proto.h to understand it */
+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);
+}
 
 /* Next available bit after the above.  Name begins with '_' so won't be
  * exported by B */
-#define _RXf_PMf_SHIFT_NEXT 6
+#define _RXf_PMf_SHIFT_NEXT (RXf_PMf_STD_PMMOD_SHIFT+8)
+
+/* Mask of the above bits.  These need to be transferred from op_pmflags to
+ * re->extflags during compilation */
+#define RXf_PMf_COMPILETIME    (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_CHARSET|RXf_PMf_FOLD|RXf_PMf_EXTENDED|RXf_PMf_KEEPCOPY)
+
+#if RXf_PMf_COMPILETIME > 255
+#  error RXf_PMf_COMPILETIME wont fit in U8 flags field of eval node
+#endif
+
+/* These copies need to be numerical or defsubs_h.PL won't know about them. */
+#define PMf_MULTILINE    1<<0
+#define PMf_SINGLELINE   1<<1
+#define PMf_FOLD         1<<2
+#define PMf_EXTENDED     1<<3
+#define PMf_KEEPCOPY     1<<4
+
+#if PMf_MULTILINE != RXf_PMf_MULTILINE || PMf_SINGLELINE != RXf_PMf_SINGLELINE || PMf_FOLD != RXf_PMf_FOLD || PMf_EXTENDED != RXf_PMf_EXTENDED || PMf_KEEPCOPY != RXf_PMf_KEEPCOPY
+#   error RXf_PMf defines are wrong
+#endif
+
+#define PMf_COMPILETIME RXf_PMf_COMPILETIME
+
+/*  Error check that haven't left something out of this.  This isn't done
+ *  directly in the #define because doing so confuses regcomp.pl.
+ *  (2**n - 1) is n 1 bits, so the below gets the contiguous bits between the
+ *  beginning and ending shifts */
+#if RXf_PMf_COMPILETIME != (((1 << (_RXf_PMf_SHIFT_NEXT))-1) \
+                            & (~((1 << RXf_PMf_STD_PMMOD_SHIFT)-1)))
+#   error RXf_PMf_COMPILETIME is invalid
+#endif
+
+#endif /* Include only once */