[perl5.git] / regcomp.h

/*    regcomp.h
 *
 *    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
 *    2000, 2001, 2002, 2003, 2005 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.
 *
 */

typedef OP OP_4tree;			/* Will be redefined later. */


#define PERL_ENABLE_TRIE_OPTIMISATION 1
#define PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION 1
#define PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS 0

/*
 * The "internal use only" fields in regexp.h are present to pass info from
 * compile to execute that permits the execute phase to run lots faster on
 * simple cases.  They are:
 *
 * regstart	sv that must begin a match; NULL if none obvious
 * reganch	is the match anchored (at beginning-of-line only)?
 * regmust	string (pointer into program) that match must include, or NULL
 *  [regmust changed to SV* for bminstr()--law]
 * regmlen	length of regmust string
 *  [regmlen not used currently]
 *
 * Regstart and reganch permit very fast decisions on suitable starting points
 * for a match, cutting down the work a lot.  Regmust permits fast rejection
 * of lines that cannot possibly match.  The regmust tests are costly enough
 * that pregcomp() supplies a regmust only if the r.e. contains something
 * potentially expensive (at present, the only such thing detected is * or +
 * at the start of the r.e., which can involve a lot of backup).  Regmlen is
 * supplied because the test in pregexec() needs it and pregcomp() is computing
 * it anyway.
 * [regmust is now supplied always.  The tests that use regmust have a
 * heuristic that disables the test if it usually matches.]
 *
 * [In fact, we now use regmust in many cases to locate where the search
 * starts in the string, so if regback is >= 0, the regmust search is never
 * wasted effort.  The regback variable says how many characters back from
 * where regmust matched is the earliest possible start of the match.
 * For instance, /[a-z].foo/ has a regmust of 'foo' and a regback of 2.]
 */

/*
 * Structure for regexp "program".  This is essentially a linear encoding
 * of a nondeterministic finite-state machine (aka syntax charts or
 * "railroad normal form" in parsing technology).  Each node is an opcode
 * plus a "next" pointer, possibly plus an operand.  "Next" pointers of
 * all nodes except BRANCH implement concatenation; a "next" pointer with
 * a BRANCH on both ends of it is connecting two alternatives.  (Here we
 * have one of the subtle syntax dependencies:  an individual BRANCH (as
 * opposed to a collection of them) is never concatenated with anything
 * because of operator precedence.)  The operand of some types of node is
 * a literal string; for others, it is a node leading into a sub-FSM.  In
 * particular, the operand of a BRANCH node is the first node of the branch.
 * (NB this is *not* a tree structure:  the tail of the branch connects
 * to the thing following the set of BRANCHes.)  The opcodes are defined
 * in regnodes.h which is generated from regcomp.sym by regcomp.pl.
 */

/*
 * A node is one char of opcode followed by two chars of "next" pointer.
 * "Next" pointers are stored as two 8-bit pieces, high order first.  The
 * value is a positive offset from the opcode of the node containing it.
 * An operand, if any, simply follows the node.  (Note that much of the
 * code generation knows about this implicit relationship.)
 *
 * Using two bytes for the "next" pointer is vast overkill for most things,
 * but allows patterns to get big without disasters.
 *
 * [The "next" pointer is always aligned on an even
 * boundary, and reads the offset directly as a short.  Also, there is no
 * special test to reverse the sign of BACK pointers since the offset is
 * stored negative.]
 */

struct regnode_string {
    U8	str_len;
    U8  type;
    U16 next_off;
    char string[1];
};

struct regnode_1 {
    U8	flags;
    U8  type;
    U16 next_off;
    U32 arg1;
};

struct regnode_2 {
    U8	flags;
    U8  type;
    U16 next_off;
    U16 arg1;
    U16 arg2;
};

#define ANYOF_BITMAP_SIZE	32	/* 256 b/(8 b/B) */
#define ANYOF_CLASSBITMAP_SIZE	 4	/* up to 32 (8*4) named classes */

struct regnode_charclass {
    U8	flags;
    U8  type;
    U16 next_off;
    U32 arg1;
    char bitmap[ANYOF_BITMAP_SIZE];	/* only compile-time */
};

struct regnode_charclass_class {	/* has [[:blah:]] classes */
    U8	flags;				/* should have ANYOF_CLASS here */
    U8  type;
    U16 next_off;
    U32 arg1;
    char bitmap[ANYOF_BITMAP_SIZE];		/* both compile-time */
    char classflags[ANYOF_CLASSBITMAP_SIZE];	/* and run-time */
};

/* XXX fix this description.
   Impose a limit of REG_INFTY on various pattern matching operations
   to limit stack growth and to avoid "infinite" recursions.
*/
/* The default size for REG_INFTY is I16_MAX, which is the same as
   SHORT_MAX (see perl.h).  Unfortunately I16 isn't necessarily 16 bits
   (see handy.h).  On the Cray C90, sizeof(short)==4 and hence I16_MAX is
   ((1<<31)-1), while on the Cray T90, sizeof(short)==8 and I16_MAX is
   ((1<<63)-1).  To limit stack growth to reasonable sizes, supply a
   smaller default.
	--Andy Dougherty  11 June 1998
*/
#if SHORTSIZE > 2
#  ifndef REG_INFTY
#    define REG_INFTY ((1<<15)-1)
#  endif
#endif

#ifndef REG_INFTY
#  define REG_INFTY I16_MAX
#endif

#define ARG_VALUE(arg) (arg)
#define ARG__SET(arg,val) ((arg) = (val))

#undef ARG
#undef ARG1
#undef ARG2

#define ARG(p) ARG_VALUE(ARG_LOC(p))
#define ARG1(p) ARG_VALUE(ARG1_LOC(p))
#define ARG2(p) ARG_VALUE(ARG2_LOC(p))
#define ARG_SET(p, val) ARG__SET(ARG_LOC(p), (val))
#define ARG1_SET(p, val) ARG__SET(ARG1_LOC(p), (val))
#define ARG2_SET(p, val) ARG__SET(ARG2_LOC(p), (val))

#undef NEXT_OFF
#undef NODE_ALIGN

#define NEXT_OFF(p) ((p)->next_off)
#define NODE_ALIGN(node)
#define NODE_ALIGN_FILL(node) ((node)->flags = 0xde) /* deadbeef */

#define SIZE_ALIGN NODE_ALIGN

#undef OP
#undef OPERAND
#undef MASK
#undef STRING

#define	OP(p)		((p)->type)
#define	OPERAND(p)	(((struct regnode_string *)p)->string)
#define MASK(p)		((char*)OPERAND(p))
#define	STR_LEN(p)	(((struct regnode_string *)p)->str_len)
#define	STRING(p)	(((struct regnode_string *)p)->string)
#define STR_SZ(l)	((l + sizeof(regnode) - 1) / sizeof(regnode))
#define NODE_SZ_STR(p)	(STR_SZ(STR_LEN(p))+1)

#undef NODE_ALIGN
#undef ARG_LOC
#undef NEXTOPER
#undef PREVOPER

#define	NODE_ALIGN(node)
#define	ARG_LOC(p)	(((struct regnode_1 *)p)->arg1)
#define	ARG1_LOC(p)	(((struct regnode_2 *)p)->arg1)
#define	ARG2_LOC(p)	(((struct regnode_2 *)p)->arg2)
#define NODE_STEP_REGNODE	1	/* sizeof(regnode)/sizeof(regnode) */
#define EXTRA_STEP_2ARGS	EXTRA_SIZE(struct regnode_2)

#define NODE_STEP_B	4

#define	NEXTOPER(p)	((p) + NODE_STEP_REGNODE)
#define	PREVOPER(p)	((p) - NODE_STEP_REGNODE)

#define FILL_ADVANCE_NODE(ptr, op) STMT_START { \
    (ptr)->type = op;    (ptr)->next_off = 0;   (ptr)++; } STMT_END
#define FILL_ADVANCE_NODE_ARG(ptr, op, arg) STMT_START { \
    ARG_SET(ptr, arg);  FILL_ADVANCE_NODE(ptr, op); (ptr) += 1; } STMT_END

#define REG_MAGIC 0234

#define SIZE_ONLY (RExC_emit == &PL_regdummy)

/* Flags for node->flags of ANYOF */

#define ANYOF_CLASS		0x08	/* has [[:blah:]] classes */
#define ANYOF_INVERT		0x04
#define ANYOF_FOLD		0x02
#define ANYOF_LOCALE		0x01

/* Used for regstclass only */
#define ANYOF_EOS		0x10		/* Can match an empty string too */

/* There is a character or a range past 0xff */
#define ANYOF_UNICODE		0x20
#define ANYOF_UNICODE_ALL	0x40	/* Can match any char past 0xff */

/* size of node is large (includes class pointer) */
#define ANYOF_LARGE 		0x80

/* Are there any runtime flags on in this node? */
#define ANYOF_RUNTIME(s)	(ANYOF_FLAGS(s) & 0x0f)

#define ANYOF_FLAGS_ALL		0xff

/* Character classes for node->classflags of ANYOF */
/* Should be synchronized with a table in regprop() */
/* 2n should pair with 2n+1 */

#define ANYOF_ALNUM	 0	/* \w, PL_utf8_alnum, utf8::IsWord, ALNUM */
#define ANYOF_NALNUM	 1
#define ANYOF_SPACE	 2	/* \s */
#define ANYOF_NSPACE	 3
#define ANYOF_DIGIT	 4
#define ANYOF_NDIGIT	 5
#define ANYOF_ALNUMC	 6	/* isalnum(3), utf8::IsAlnum, ALNUMC */
#define ANYOF_NALNUMC	 7
#define ANYOF_ALPHA	 8
#define ANYOF_NALPHA	 9
#define ANYOF_ASCII	10
#define ANYOF_NASCII	11
#define ANYOF_CNTRL	12
#define ANYOF_NCNTRL	13
#define ANYOF_GRAPH	14
#define ANYOF_NGRAPH	15
#define ANYOF_LOWER	16
#define ANYOF_NLOWER	17
#define ANYOF_PRINT	18
#define ANYOF_NPRINT	19
#define ANYOF_PUNCT	20
#define ANYOF_NPUNCT	21
#define ANYOF_UPPER	22
#define ANYOF_NUPPER	23
#define ANYOF_XDIGIT	24
#define ANYOF_NXDIGIT	25
#define ANYOF_PSXSPC	26	/* POSIX space: \s plus the vertical tab */
#define ANYOF_NPSXSPC	27
#define ANYOF_BLANK	28	/* GNU extension: space and tab: non-vertical space */
#define ANYOF_NBLANK	29

#define ANYOF_MAX	32

/* Backward source code compatibility. */

#define ANYOF_ALNUML	 ANYOF_ALNUM
#define ANYOF_NALNUML	 ANYOF_NALNUM
#define ANYOF_SPACEL	 ANYOF_SPACE
#define ANYOF_NSPACEL	 ANYOF_NSPACE

/* Utility macros for the bitmap and classes of ANYOF */

#define ANYOF_SIZE		(sizeof(struct regnode_charclass))
#define ANYOF_CLASS_SIZE	(sizeof(struct regnode_charclass_class))

#define ANYOF_FLAGS(p)		((p)->flags)

#define ANYOF_BIT(c)		(1 << ((c) & 7))

#define ANYOF_CLASS_BYTE(p, c)	(((struct regnode_charclass_class*)(p))->classflags[((c) >> 3) & 3])
#define ANYOF_CLASS_SET(p, c)	(ANYOF_CLASS_BYTE(p, c) |=  ANYOF_BIT(c))
#define ANYOF_CLASS_CLEAR(p, c)	(ANYOF_CLASS_BYTE(p, c) &= ~ANYOF_BIT(c))
#define ANYOF_CLASS_TEST(p, c)	(ANYOF_CLASS_BYTE(p, c) &   ANYOF_BIT(c))

#define ANYOF_CLASS_ZERO(ret)	Zero(((struct regnode_charclass_class*)(ret))->classflags, ANYOF_CLASSBITMAP_SIZE, char)
#define ANYOF_BITMAP_ZERO(ret)	Zero(((struct regnode_charclass*)(ret))->bitmap, ANYOF_BITMAP_SIZE, char)

#define ANYOF_BITMAP(p)		(((struct regnode_charclass*)(p))->bitmap)
#define ANYOF_BITMAP_BYTE(p, c)	(ANYOF_BITMAP(p)[((c) >> 3) & 31])
#define ANYOF_BITMAP_SET(p, c)	(ANYOF_BITMAP_BYTE(p, c) |=  ANYOF_BIT(c))
#define ANYOF_BITMAP_CLEAR(p,c)	(ANYOF_BITMAP_BYTE(p, c) &= ~ANYOF_BIT(c))
#define ANYOF_BITMAP_TEST(p, c)	(ANYOF_BITMAP_BYTE(p, c) &   ANYOF_BIT(c))

#define ANYOF_BITMAP_SETALL(p)		\
	memset (ANYOF_BITMAP(p), 255, ANYOF_BITMAP_SIZE)
#define ANYOF_BITMAP_CLEARALL(p)	\
	Zero (ANYOF_BITMAP(p), ANYOF_BITMAP_SIZE)
/* Check that all 256 bits are all set.  Used in S_cl_is_anything()  */
#define ANYOF_BITMAP_TESTALLSET(p)	\
	memEQ (ANYOF_BITMAP(p), "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377", ANYOF_BITMAP_SIZE)

#define ANYOF_SKIP		((ANYOF_SIZE - 1)/sizeof(regnode))
#define ANYOF_CLASS_SKIP	((ANYOF_CLASS_SIZE - 1)/sizeof(regnode))
#define ANYOF_CLASS_ADD_SKIP	(ANYOF_CLASS_SKIP - ANYOF_SKIP)

/*
 * Utility definitions.
 */
#ifndef CHARMASK
#  define UCHARAT(p)	((int)*(const U8*)(p))
#else
#  define UCHARAT(p)	((int)*(p)&CHARMASK)
#endif

#define EXTRA_SIZE(guy) ((sizeof(guy)-1)/sizeof(struct regnode))

#define REG_SEEN_ZERO_LEN	0x00000001
#define REG_SEEN_LOOKBEHIND	0x00000002
#define REG_SEEN_GPOS		0x00000004
#define REG_SEEN_EVAL		0x00000008
#define REG_SEEN_CANY		0x00000010
#define REG_SEEN_SANY		REG_SEEN_CANY /* src bckwrd cmpt */

START_EXTERN_C

#ifdef PLUGGABLE_RE_EXTENSION
#include "re_nodes.h"
#else
#include "regnodes.h"
#endif

/* The following have no fixed length. U8 so we can do strchr() on it. */
#ifndef DOINIT
EXTCONST U8 PL_varies[];
#else
EXTCONST U8 PL_varies[] = {
    BRANCH, BACK, STAR, PLUS, CURLY, CURLYX, REF, REFF, REFFL,
    WHILEM, CURLYM, CURLYN, BRANCHJ, IFTHEN, SUSPEND, CLUMP, 0
};
#endif

/* The following always have a length of 1. U8 we can do strchr() on it. */
/* (Note that length 1 means "one character" under UTF8, not "one octet".) */
#ifndef DOINIT
EXTCONST U8 PL_simple[];
#else
EXTCONST U8 PL_simple[] = {
    REG_ANY,	SANY,	CANY,
    ANYOF,
    ALNUM,	ALNUML,
    NALNUM,	NALNUML,
    SPACE,	SPACEL,
    NSPACE,	NSPACEL,
    DIGIT,	NDIGIT,
    0
};
#endif

END_EXTERN_C

typedef struct re_scream_pos_data_s
{
    char **scream_olds;		/* match pos */
    I32 *scream_pos;		/* Internal iterator of scream. */
} re_scream_pos_data;

/* .what is a character array with one character for each member of .data
 * The character describes the function of the corresponding .data item:
 *   f - start-class data for regstclass optimization
 *   n - Root of op tree for (?{EVAL}) item
 *   o - Start op for (?{EVAL}) item
 *   p - Pad for (?{EVAL}) item
 *   s - swash for unicode-style character class, and the multicharacter
 *       strings resulting from casefolding the single-character entries
 *       in the character class
 *   t - trie struct
 *   T - aho-trie struct
 * 20010712 mjd@plover.com
 * (Remember to update re_dup() and pregfree() if you add any items.)
 */
struct reg_data {
    U32 count;
    U8 *what;
    void* data[1];
};

struct reg_substr_datum {
    I32 min_offset;
    I32 max_offset;
    SV *substr;		/* non-utf8 variant */
    SV *utf8_substr;	/* utf8 variant */
};

struct reg_substr_data {
    struct reg_substr_datum data[3];	/* Actual array */
};

#define anchored_substr substrs->data[0].substr
#define anchored_utf8 substrs->data[0].utf8_substr
#define anchored_offset substrs->data[0].min_offset
#define float_substr substrs->data[1].substr
#define float_utf8 substrs->data[1].utf8_substr
#define float_min_offset substrs->data[1].min_offset
#define float_max_offset substrs->data[1].max_offset
#define check_substr substrs->data[2].substr
#define check_utf8 substrs->data[2].utf8_substr
#define check_offset_min substrs->data[2].min_offset
#define check_offset_max substrs->data[2].max_offset


/* trie related stuff */

/* a transition record for the state machine. the
   check field determines which state "owns" the
   transition. the char the transition is for is
   determined by offset from the owning states base
   field.  the next field determines which state
   is to be transitioned to if any.
*/
struct _reg_trie_trans {
  U32 next;
  U32 check;
};

/* a transition list element for the list based representation */
struct _reg_trie_trans_list_elem {
    U16 forid;
    U32 newstate;
};
typedef struct _reg_trie_trans_list_elem reg_trie_trans_le;

/* a state for compressed nodes. base is an offset
  into an array of reg_trie_trans array. If wordnum is
  nonzero the state is accepting. if base is zero then
  the state has no children (and will be accepting)
*/
struct _reg_trie_state {
  U16 wordnum;
  union {
    U32                base;
    reg_trie_trans_le* list;
  } trans;
};


typedef struct _reg_trie_state    reg_trie_state;
typedef struct _reg_trie_trans    reg_trie_trans;


/* anything in here that needs to be freed later
   should be dealt with in pregfree */
struct _reg_trie_data {
    U16              uniquecharcount;
    U32              lasttrans;
    U16              *charmap;
    HV               *widecharmap;
    reg_trie_state   *states;
    reg_trie_trans   *trans;
    char             *bitmap;
    U32              refcount;
    U32              startstate;
    STRLEN           minlen;
    STRLEN           maxlen;
    U32              *wordlen;
    U32              laststate;   /* Build only */
#ifdef DEBUGGING
    U16              wordcount;   /* Build only */
    STRLEN           charcount;   /* Build only */
    AV               *words;
    AV               *revcharmap;
#endif
};
typedef struct _reg_trie_data reg_trie_data;

struct _reg_ac_data {
    U32              *fail;
    reg_trie_state   *states;
    reg_trie_data    *trie;
    U32              refcount;
};
typedef struct _reg_ac_data reg_ac_data;

/* ANY_BIT doesnt use the structure, so we can borrow it here.
   This is simpler than refactoring all of it as wed end up with
   three different sets... */

#define TRIE_BITMAP(p)		(((reg_trie_data *)(p))->bitmap)
#define TRIE_BITMAP_BYTE(p, c)	(TRIE_BITMAP(p)[(((U8)c) >> 3) & 31])
#define TRIE_BITMAP_SET(p, c)	(TRIE_BITMAP_BYTE(p, c) |=  ANYOF_BIT((U8)c))
#define TRIE_BITMAP_CLEAR(p,c)	(TRIE_BITMAP_BYTE(p, c) &= ~ANYOF_BIT((U8)c))
#define TRIE_BITMAP_TEST(p, c)	(TRIE_BITMAP_BYTE(p, c) &   ANYOF_BIT((U8)c))


/* these defines assume uniquecharcount is the correct variable, and state may be evaluated twice */
#define TRIE_NODENUM(state) (((state)-1)/(trie->uniquecharcount)+1)
#define SAFE_TRIE_NODENUM(state) ((state) ? (((state)-1)/(trie->uniquecharcount)+1) : (state))
#define TRIE_NODEIDX(state) ((state) ? (((state)-1)*(trie->uniquecharcount)+1) : (state))

#ifdef DEBUGGING
#define TRIE_WORDCOUNT(trie) ((trie)->wordcount)
#define TRIE_CHARCOUNT(trie) ((trie)->charcount)
#define TRIE_LASTSTATE(trie) ((trie)->laststate)
#define TRIE_REVCHARMAP(trie) ((trie)->revcharmap)
#else
#define TRIE_WORDCOUNT(trie) (trie_wordcount)
#define TRIE_CHARCOUNT(trie) (trie_charcount)
/*#define TRIE_LASTSTATE(trie) (trie_laststate)*/
#define TRIE_LASTSTATE(trie) ((trie)->laststate)
#define TRIE_REVCHARMAP(trie) (trie_revcharmap)
#endif

#define RE_TRIE_MAXBUF_INIT 65536
#define RE_TRIE_MAXBUF_NAME "\022E_TRIE_MAXBUF"
#define RE_DEBUG_FLAGS "\022E_DEBUG_FLAGS"

/*

RE_DEBUG_FLAGS is used to control what debug output is emitted
its divided into three groups of options, some of which interact.
The three groups are: Compile, Execute, Extra. There is room for a
further group, as currently only the low three bytes are used.

    Compile Options:
    
    PARSE
    PEEP
    TRIE
    PROGRAM
    OFFSETS

    Execute Options:

    INTUIT
    MATCH
    TRIE

    Extra Options

    TRIE
    OFFSETS

If you modify any of these make sure you make corresponding changes to
re.pm, especially to the documentation.

*/


/* Compile */
#define RE_DEBUG_COMPILE_MASK      0x0000FF
#define RE_DEBUG_COMPILE_PARSE     0x000001
#define RE_DEBUG_COMPILE_OPTIMISE  0x000002
#define RE_DEBUG_COMPILE_TRIE      0x000004
#define RE_DEBUG_COMPILE_DUMP      0x000008
#define RE_DEBUG_COMPILE_OFFSETS   0x000010

/* Execute */
#define RE_DEBUG_EXECUTE_MASK      0x00FF00
#define RE_DEBUG_EXECUTE_INTUIT    0x000100
#define RE_DEBUG_EXECUTE_MATCH     0x000200
#define RE_DEBUG_EXECUTE_TRIE      0x000400

/* Extra */
#define RE_DEBUG_EXTRA_MASK        0xFF0000
#define RE_DEBUG_EXTRA_TRIE        0x010000
#define RE_DEBUG_EXTRA_OFFSETS     0x020000
#define RE_DEBUG_EXTRA_STATE       0x040000

#define RE_DEBUG_FLAG(x) (re_debug_flags & x)
/* Compile */
#define DEBUG_COMPILE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_COMPILE_MASK) x  )
#define DEBUG_PARSE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_COMPILE_PARSE) x  )
#define DEBUG_OPTIMISE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_COMPILE_OPTIMISE) x  )
#define DEBUG_PARSE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_COMPILE_PARSE) x  )
#define DEBUG_DUMP_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_COMPILE_DUMP) x  )
#define DEBUG_OFFSETS_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_COMPILE_OFFSETS) x  )
#define DEBUG_TRIE_COMPILE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_COMPILE_TRIE) x )

/* Execute */
#define DEBUG_EXECUTE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_EXECUTE_MASK) x  )
#define DEBUG_INTUIT_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_EXECUTE_INTUIT) x  )
#define DEBUG_MATCH_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_EXECUTE_MATCH) x  )
#define DEBUG_TRIE_EXECUTE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_EXECUTE_TRIE) x )

/* Extra */
#define DEBUG_EXTRA_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_EXTRA_MASK) x  )
#define DEBUG_STATE_r(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_EXTRA_STATE) x )
#define MJD_OFFSET_DEBUG(x) DEBUG_r( \
    if (re_debug_flags & RE_DEBUG_EXTRA_OFFSETS) \
        Perl_warn_nocontext x )
#define DEBUG_TRIE_COMPILE_MORE_r(x) DEBUG_TRIE_COMPILE_r( \
    if (re_debug_flags & RE_DEBUG_EXTRA_TRIE) x )
#define DEBUG_TRIE_EXECUTE_MORE_r(x) DEBUG_TRIE_EXECUTE_r( \
    if (re_debug_flags & RE_DEBUG_EXTRA_TRIE) x )

#define DEBUG_TRIE_r(x) DEBUG_r( \
    if (re_debug_flags & (RE_DEBUG_COMPILE_TRIE \
        | RE_DEBUG_EXECUTE_TRIE )) x )

/* initialization */
/* get_sv() can return NULL during global destruction. */
#define GET_RE_DEBUG_FLAGS DEBUG_r({ \
        SV * re_debug_flags_sv = NULL; \
        re_debug_flags_sv = get_sv(RE_DEBUG_FLAGS, 1); \
        if (re_debug_flags_sv) { \
            if (!SvIOK(re_debug_flags_sv)) \
                sv_setuv(re_debug_flags_sv, RE_DEBUG_COMPILE_DUMP | RE_DEBUG_EXECUTE_MASK ); \
            re_debug_flags=SvIV(re_debug_flags_sv); \
        }\
})

#ifdef DEBUGGING

#define GET_RE_DEBUG_FLAGS_DECL IV re_debug_flags = 0; GET_RE_DEBUG_FLAGS;

#define RE_PV_COLOR_DECL(rpv,rlen,isuni,dsv,pv,l,m,c1,c2) \
    const char * const rpv =                          \
        pv_pretty((dsv), (pv), (l), (m), \
            PL_colors[(c1)],PL_colors[(c2)], \
            ((isuni) ? PERL_PV_ESCAPE_UNI : 0) );         \
    const int rlen = SvCUR(dsv)

#define RE_SV_ESCAPE(rpv,isuni,dsv,sv,m) \
    const char * const rpv =                          \
        pv_pretty((dsv), (SvPV_nolen_const(sv)), (SvCUR(sv)), (m), \
            PL_colors[(c1)],PL_colors[(c2)], \
            ((isuni) ? PERL_PV_ESCAPE_UNI : 0) )

#define RE_PV_QUOTED_DECL(rpv,isuni,dsv,pv,l,m)                    \
    const char * const rpv =                                       \
        pv_pretty((dsv), (pv), (l), (m), \
            PL_colors[0], PL_colors[1], \
            ( PERL_PV_PRETTY_QUOTE | PERL_PV_PRETTY_ELIPSES |      \
              ((isuni) ? PERL_PV_ESCAPE_UNI : 0))                  \
        )                                                  

#define RE_SV_DUMPLEN(ItEm) (SvCUR(ItEm) - (SvTAIL(ItEm)!=0))
#define RE_SV_TAIL(ItEm) (SvTAIL(ItEm) ? "$" : "")
    
#else /* if not DEBUGGING */

#define GET_RE_DEBUG_FLAGS_DECL
#define RE_PV_COLOR_DECL(rpv,rlen,isuni,dsv,pv,l,m,c1,c2)
#define RE_SV_ESCAPE(rpv,isuni,dsv,sv,m)
#define RE_PV_QUOTED_DECL(rpv,isuni,dsv,pv,l,m)
#define RE_SV_DUMPLEN(ItEm)
#define RE_SV_TAIL(ItEm)

#endif /* DEBUG RELATED DEFINES */