[perl5.git] / regexp.h

/*    regexp.h
 *
 *    Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
 *    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.
 *
 */

/*
 * Definitions etc. for regexp(3) routines.
 *
 * Caveat:  this is V8 regexp(3) [actually, a reimplementation thereof],
 * not the System V one.
 */


struct regnode {
    U8	flags;
    U8  type;
    U16 next_off;
};

typedef struct regnode regnode;

struct reg_substr_data;

struct reg_data;

typedef struct regexp {
	I32 *startp;
	I32 *endp;
	regnode *regstclass;
        struct reg_substr_data *substrs;
	char *precomp;		/* pre-compilation regular expression */
        struct reg_data *data;	/* Additional data. */
	char *subbeg;		/* saved or original string 
				   so \digit works forever. */
#ifdef PERL_OLD_COPY_ON_WRITE
        SV *saved_copy;         /* If non-NULL, SV which is COW from original */
#endif
        U32 *offsets;           /* offset annotations 20001228 MJD */
	I32 sublen;		/* Length of string pointed by subbeg */
	I32 refcnt;
	I32 minlen;		/* mininum possible length of $& */
	I32 prelen;		/* length of precomp */
	U32 nparens;		/* number of parentheses */
	U32 lastparen;		/* last paren matched */
	U32 lastcloseparen;	/* last paren matched */
	U32 reganch;		/* Internal use only +
				   Tainted information used by regexec? */
	regnode program[1];	/* Unwarranted chumminess with compiler. */
} regexp;

#define ROPT_ANCH		(ROPT_ANCH_BOL|ROPT_ANCH_MBOL|ROPT_ANCH_GPOS|ROPT_ANCH_SBOL)
#define ROPT_ANCH_SINGLE	(ROPT_ANCH_SBOL|ROPT_ANCH_GPOS)
#define ROPT_ANCH_BOL	 	0x00001
#define ROPT_ANCH_MBOL	 	0x00002
#define ROPT_ANCH_SBOL	 	0x00004
#define ROPT_ANCH_GPOS	 	0x00008
#define ROPT_SKIP		0x00010
#define ROPT_IMPLICIT		0x00020	/* Converted .* to ^.* */
#define ROPT_NOSCAN		0x00040	/* Check-string always at start. */
#define ROPT_GPOS_SEEN		0x00080
#define ROPT_CHECK_ALL		0x00100
#define ROPT_LOOKBEHIND_SEEN	0x00200
#define ROPT_EVAL_SEEN		0x00400
#define ROPT_CANY_SEEN		0x00800
#define ROPT_SANY_SEEN		ROPT_CANY_SEEN /* src bckwrd cmpt */

/* 0xf800 of reganch is used by PMf_COMPILETIME */

#define ROPT_UTF8		0x10000
#define ROPT_NAUGHTY		0x20000 /* how exponential is this pattern? */
#define ROPT_COPY_DONE		0x40000	/* subbeg is a copy of the string */
#define ROPT_TAINTED_SEEN	0x80000
#define ROPT_MATCH_UTF8		0x10000000 /* subbeg is utf-8 */

#define RE_USE_INTUIT_NOML	0x0100000 /* Best to intuit before matching */
#define RE_USE_INTUIT_ML	0x0200000
#define REINT_AUTORITATIVE_NOML	0x0400000 /* Can trust a positive answer */
#define REINT_AUTORITATIVE_ML	0x0800000 
#define REINT_ONCE_NOML		0x1000000 /* Intuit can succed once only. */
#define REINT_ONCE_ML		0x2000000
#define RE_INTUIT_ONECHAR	0x4000000
#define RE_INTUIT_TAIL		0x8000000

#define RE_USE_INTUIT		(RE_USE_INTUIT_NOML|RE_USE_INTUIT_ML)
#define REINT_AUTORITATIVE	(REINT_AUTORITATIVE_NOML|REINT_AUTORITATIVE_ML)
#define REINT_ONCE		(REINT_ONCE_NOML|REINT_ONCE_ML)

#define RX_MATCH_TAINTED(prog)	((prog)->reganch & ROPT_TAINTED_SEEN)
#define RX_MATCH_TAINTED_on(prog) ((prog)->reganch |= ROPT_TAINTED_SEEN)
#define RX_MATCH_TAINTED_off(prog) ((prog)->reganch &= ~ROPT_TAINTED_SEEN)
#define RX_MATCH_TAINTED_set(prog, t) ((t) \
				       ? RX_MATCH_TAINTED_on(prog) \
				       : RX_MATCH_TAINTED_off(prog))

#define RX_MATCH_COPIED(prog)		((prog)->reganch & ROPT_COPY_DONE)
#define RX_MATCH_COPIED_on(prog)	((prog)->reganch |= ROPT_COPY_DONE)
#define RX_MATCH_COPIED_off(prog)	((prog)->reganch &= ~ROPT_COPY_DONE)
#define RX_MATCH_COPIED_set(prog,t)	((t) \
					 ? RX_MATCH_COPIED_on(prog) \
					 : RX_MATCH_COPIED_off(prog))

#ifdef PERL_OLD_COPY_ON_WRITE
#define RX_MATCH_COPY_FREE(rx) \
	STMT_START {if (rx->saved_copy) { \
	    SV_CHECK_THINKFIRST_COW_DROP(rx->saved_copy); \
	} \
	if (RX_MATCH_COPIED(rx)) { \
	    Safefree(rx->subbeg); \
	    RX_MATCH_COPIED_off(rx); \
	}} STMT_END
#else
#define RX_MATCH_COPY_FREE(rx) \
	STMT_START {if (RX_MATCH_COPIED(rx)) { \
	    Safefree(rx->subbeg); \
	    RX_MATCH_COPIED_off(rx); \
	}} STMT_END
#endif

#define RX_MATCH_UTF8(prog)		((prog)->reganch & ROPT_MATCH_UTF8)
#define RX_MATCH_UTF8_on(prog)		((prog)->reganch |= ROPT_MATCH_UTF8)
#define RX_MATCH_UTF8_off(prog)		((prog)->reganch &= ~ROPT_MATCH_UTF8)
#define RX_MATCH_UTF8_set(prog, t)	((t) \
			? (RX_MATCH_UTF8_on(prog), (PL_reg_match_utf8 = 1)) \
			: (RX_MATCH_UTF8_off(prog), (PL_reg_match_utf8 = 0)))
    
#define REXEC_COPY_STR	0x01		/* Need to copy the string. */
#define REXEC_CHECKED	0x02		/* check_substr already checked. */
#define REXEC_SCREAM	0x04		/* use scream table. */
#define REXEC_IGNOREPOS	0x08		/* \G matches at start. */
#define REXEC_NOT_FIRST	0x10		/* This is another iteration of //g. */

#define ReREFCNT_inc(re) ((void)(re && re->refcnt++), re)
#define ReREFCNT_dec(re) CALLREGFREE(aTHX_ re)

#define FBMcf_TAIL_DOLLAR	1
#define FBMcf_TAIL_DOLLARM	2
#define FBMcf_TAIL_Z		4
#define FBMcf_TAIL_z		8
#define FBMcf_TAIL		(FBMcf_TAIL_DOLLAR|FBMcf_TAIL_DOLLARM|FBMcf_TAIL_Z|FBMcf_TAIL_z)

#define FBMrf_MULTILINE	1

struct re_scream_pos_data_s;

/* an accepting state/position*/
struct _reg_trie_accepted {
    U8   *endpos;
    U16  wordnum;
};
typedef struct _reg_trie_accepted reg_trie_accepted;

/* some basic information about the current match that is created by
 * Perl_regexec_flags and then passed to regtry(), regmatch() etc */

typedef struct {
    regexp *prog;
    char *bol;
    char *till;
    SV *sv;
    char *ganch;
} regmatch_info;
 

/* structures for holding and saving the state maintained by regmatch() */

typedef I32 CHECKPOINT;

typedef enum {
    resume_TRIE1,
    resume_TRIE2,
    resume_EVAL,
    resume_CURLYX,
    resume_WHILEM1,
    resume_WHILEM2,
    resume_WHILEM3,
    resume_WHILEM4,
    resume_WHILEM5,
    resume_WHILEM6,
    resume_CURLYM1,
    resume_CURLYM2,
    resume_CURLYM3,
    resume_IFMATCH,
    resume_PLUS1,
    resume_PLUS2,
    resume_PLUS3,
    resume_PLUS4
} regmatch_resume_states;


typedef struct regmatch_state {

    /* these vars contain state that needs to be maintained
     * across the main while loop ... */

    regmatch_resume_states resume_state; /* where to jump to on return */
    regnode *scan;		/* Current node. */
    regnode *next;		/* Next node. */
    bool minmod;		/* the next "{n,m}" is a "{n,m}?" */
    bool sw;			/* the condition value in (?(cond)a|b) */
    int logical;
    I32 unwind;			/* savestack index of current unwind block */
    struct regmatch_state  *cc;	/* current innermost curly state */
    char *locinput;

    /* ... while the rest of these are local to an individual branch */

    I32 n;			/* no or next */
    I32 ln;			/* len or last */

    union {

	/* this is a fake union member that matches the first element
	 * of each member that needs to store positive backtrack
	 * information */
	struct {
	    struct regmatch_state *prev_yes_state;
	} yes;

	struct {
	    reg_trie_accepted *accept_buff;
	    U32 accepted;	/* how many accepting states we have seen */
	} trie;

	struct {
	    /* this first element must match u.yes */
	    struct regmatch_state *prev_yes_state;
	    regexp	*prev_rex;
	    int		toggleutf;
	    CHECKPOINT	cp;	/* remember current savestack indexes */
	    CHECKPOINT	lastcp;
	} eval;

	struct {
	    CHECKPOINT cp;	/* remember current savestack indexes */
	    struct regmatch_state *outercc; /* outer CURLYX state if any */

	    /* these contain the current curly state, and are accessed
	     * by subsequent WHILEMs */
	    int		parenfloor;/* how far back to strip paren data */
	    int		cur;	/* how many instances of scan we've matched */
	    int		min;	/* the minimal number of scans to match */
	    int		max;	/* the maximal number of scans to match */
	    regnode *	scan;	/* the thing to match */
	    char *	lastloc;/* where we started matching this scan */
	} curlyx;

	struct {
	    CHECKPOINT cp;	/* remember current savestack indexes */
	    CHECKPOINT lastcp;
	    struct regmatch_state *savecc;
	    char *lastloc;	/* Detection of 0-len. */
	    I32 cache_offset;
	    I32 cache_bit;
	} whilem;

	struct {
	    /* this first element must match u.yes */
	    struct regmatch_state *prev_yes_state;
	    I32 paren;
	    I32 c1, c2;		/* case fold search */
	    CHECKPOINT lastcp;
	    I32 l;
	    I32 matches;
	    I32 maxwanted;
	    bool minmod;
	} curlym;

	struct {
	    I32 paren;
	    CHECKPOINT lastcp;
	    I32 c1, c2;		/* case fold search */
	    char *e;
	    char *old;
	    int count;
	} plus; /* and CURLYN/CURLY/STAR */

	struct {
	    /* this first element must match u.yes */
	    struct regmatch_state *prev_yes_state;
	    I32 wanted;
	} ifmatch; /* and SUSPEND/UNLESSM */
    } u;
} regmatch_state;

/* how many regmatch_state structs to allocate as a single slab.
 * We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
 * pointers, plus 1 for any mythical malloc overhead. */
 
#define PERL_REGMATCH_SLAB_SLOTS \
    ((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))

typedef struct regmatch_slab {
    regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
    struct regmatch_slab *prev, *next;
} regmatch_slab;

#define PL_reg_flags		PL_reg_state.re_state_reg_flags
#define PL_bostr		PL_reg_state.re_state_bostr
#define PL_reginput		PL_reg_state.re_state_reginput
#define PL_regeol		PL_reg_state.re_state_regeol
#define PL_regstartp		PL_reg_state.re_state_regstartp
#define PL_regendp		PL_reg_state.re_state_regendp
#define PL_reglastparen		PL_reg_state.re_state_reglastparen
#define PL_reglastcloseparen	PL_reg_state.re_state_reglastcloseparen
#define PL_reg_start_tmp	PL_reg_state.re_state_reg_start_tmp
#define PL_reg_start_tmpl	PL_reg_state.re_state_reg_start_tmpl
#define PL_reg_eval_set		PL_reg_state.re_state_reg_eval_set
#define PL_regindent		PL_reg_state.re_state_regindent
#define PL_reg_match_utf8	PL_reg_state.re_state_reg_match_utf8
#define PL_reg_magic		PL_reg_state.re_state_reg_magic
#define PL_reg_oldpos		PL_reg_state.re_state_reg_oldpos
#define PL_reg_oldcurpm		PL_reg_state.re_state_reg_oldcurpm
#define PL_reg_curpm		PL_reg_state.re_state_reg_curpm
#define PL_reg_oldsaved		PL_reg_state.re_state_reg_oldsaved
#define PL_reg_oldsavedlen	PL_reg_state.re_state_reg_oldsavedlen
#define PL_reg_maxiter		PL_reg_state.re_state_reg_maxiter
#define PL_reg_leftiter		PL_reg_state.re_state_reg_leftiter
#define PL_reg_poscache		PL_reg_state.re_state_reg_poscache
#define PL_reg_poscache_size	PL_reg_state.re_state_reg_poscache_size
#define PL_regsize		PL_reg_state.re_state_regsize
#define PL_reg_starttry		PL_reg_state.re_state_reg_starttry
#define PL_nrs			PL_reg_state.re_state_nrs

struct re_save_state {
    U32 re_state_reg_flags;		/* from regexec.c */
    char *re_state_bostr;
    char *re_state_reginput;		/* String-input pointer. */
    char *re_state_regeol;		/* End of input, for $ check. */
    I32 *re_state_regstartp;		/* Pointer to startp array. */
    I32 *re_state_regendp;		/* Ditto for endp. */
    U32 *re_state_reglastparen;		/* Similarly for lastparen. */
    U32 *re_state_reglastcloseparen;	/* Similarly for lastcloseparen. */
    char **re_state_reg_start_tmp;	/* from regexec.c */
    U32 re_state_reg_start_tmpl;	/* from regexec.c */
    I32 re_state_reg_eval_set;		/* from regexec.c */
    int re_state_regindent;		/* from regexec.c */
    bool re_state_reg_match_utf8;	/* from regexec.c */
    MAGIC *re_state_reg_magic;		/* from regexec.c */
    I32 re_state_reg_oldpos;		/* from regexec.c */
    PMOP *re_state_reg_oldcurpm;	/* from regexec.c */
    PMOP *re_state_reg_curpm;		/* from regexec.c */
    char *re_state_reg_oldsaved;	/* old saved substr during match */
    STRLEN re_state_reg_oldsavedlen;	/* old length of saved substr during match */
    I32 re_state_reg_maxiter;		/* max wait until caching pos */
    I32 re_state_reg_leftiter;		/* wait until caching pos */
    char *re_state_reg_poscache;	/* cache of pos of WHILEM */
    STRLEN re_state_reg_poscache_size;	/* size of pos cache of WHILEM */
    I32 re_state_regsize;		/* from regexec.c */
    char *re_state_reg_starttry;	/* from regexec.c */
#ifdef PERL_OLD_COPY_ON_WRITE
    SV *re_state_nrs;			/* was placeholder: unused since 5.8.0 (5.7.2 patch #12027 for bug ID 20010815.012). Used to save rx->saved_copy */
#endif
};

#define SAVESTACK_ALLOC_FOR_RE_SAVE_STATE \
	(1 + ((sizeof(struct re_save_state) - 1) / sizeof(*PL_savestack)))
/*
 * Local variables:
 * c-indentation-style: bsd
 * c-basic-offset: 4
 * indent-tabs-mode: t
 * End:
 *
 * ex: set ts=8 sts=4 sw=4 noet:
 */
Commit	Line	Data
a0d0e21e	1	/* regexp.h
d6376244	2	*
4bb101f2 JH	3	* Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003,
4bb101f2 JH	4	* by Larry Wall and others
d6376244 JH	5	*
	6	* You may distribute under the terms of either the GNU General Public
	7	* License or the Artistic License, as specified in the README file.
	8	*
a0d0e21e LW	9	*/
a0d0e21e LW	10
378cc40b LW	11	/*
	12	* Definitions etc. for regexp(3) routines.
	13	*
	14	* Caveat: this is V8 regexp(3) [actually, a reimplementation thereof],
	15	* not the System V one.
	16	*/
	17
378cc40b	18
c277df42 IZ	19	struct regnode {
	20	U8 flags;
	21	U8 type;
	22	U16 next_off;
	23	};
	24
	25	typedef struct regnode regnode;
	26
cad2e5aa	27	struct reg_substr_data;
2779dcf1	28
0ee3c8d0 JH	29	struct reg_data;
0ee3c8d0 JH	30
378cc40b	31	typedef struct regexp {
cf93c79d IZ	32	I32 *startp;
cf93c79d IZ	33	I32 *endp;
c277df42	34	regnode *regstclass;
2779dcf1	35	struct reg_substr_data *substrs;
cf93c79d	36	char precomp; / pre-compilation regular expression */
c277df42	37	struct reg_data data; / Additional data. */
cf93c79d IZ	38	char subbeg; / saved or original string
cf93c79d IZ	39	so \digit works forever. */
f8c7b90f	40	#ifdef PERL_OLD_COPY_ON_WRITE
ed252734 NC	41	SV saved_copy; / If non-NULL, SV which is COW from original */
ed252734 NC	42	#endif
fac92740	43	U32 offsets; / offset annotations 20001228 MJD */
cf93c79d IZ	44	I32 sublen; /* Length of string pointed by subbeg */
	45	I32 refcnt;
	46	I32 minlen; /* mininum possible length of $& */
	47	I32 prelen; /* length of precomp */
	48	U32 nparens; /* number of parentheses */
	49	U32 lastparen; /* last paren matched */
a01268b5	50	U32 lastcloseparen; /* last paren matched */
cf93c79d IZ	51	U32 reganch; /* Internal use only +
cf93c79d IZ	52	Tainted information used by regexec? */
c277df42	53	regnode program[1]; /* Unwarranted chumminess with compiler. */
378cc40b LW	54	} regexp;
378cc40b LW	55
cad2e5aa JH	56	#define ROPT_ANCH (ROPT_ANCH_BOL\|ROPT_ANCH_MBOL\|ROPT_ANCH_GPOS\|ROPT_ANCH_SBOL)
cad2e5aa JH	57	#define ROPT_ANCH_SINGLE (ROPT_ANCH_SBOL\|ROPT_ANCH_GPOS)
a0ed51b3 LW	58	#define ROPT_ANCH_BOL 0x00001
a0ed51b3 LW	59	#define ROPT_ANCH_MBOL 0x00002
cad2e5aa JH	60	#define ROPT_ANCH_SBOL 0x00004
	61	#define ROPT_ANCH_GPOS 0x00008
	62	#define ROPT_SKIP 0x00010
	63	#define ROPT_IMPLICIT 0x00020 /* Converted .* to ^.* */
	64	#define ROPT_NOSCAN 0x00040 /* Check-string always at start. */
	65	#define ROPT_GPOS_SEEN 0x00080
	66	#define ROPT_CHECK_ALL 0x00100
	67	#define ROPT_LOOKBEHIND_SEEN 0x00200
	68	#define ROPT_EVAL_SEEN 0x00400
cce850e4 JH	69	#define ROPT_CANY_SEEN 0x00800
cce850e4 JH	70	#define ROPT_SANY_SEEN ROPT_CANY_SEEN /* src bckwrd cmpt */
a0ed51b3	71
8782bef2	72	/* 0xf800 of reganch is used by PMf_COMPILETIME */
c277df42	73
a0ed51b3 LW	74	#define ROPT_UTF8 0x10000
a0ed51b3 LW	75	#define ROPT_NAUGHTY 0x20000 /* how exponential is this pattern? */
cf93c79d	76	#define ROPT_COPY_DONE 0x40000 /* subbeg is a copy of the string */
bc9a0d2c	77	#define ROPT_TAINTED_SEEN 0x80000
a30b2f1f	78	#define ROPT_MATCH_UTF8 0x10000000 /* subbeg is utf-8 */
a0ed51b3	79
cad2e5aa JH	80	#define RE_USE_INTUIT_NOML 0x0100000 /* Best to intuit before matching */
	81	#define RE_USE_INTUIT_ML 0x0200000
	82	#define REINT_AUTORITATIVE_NOML 0x0400000 /* Can trust a positive answer */
	83	#define REINT_AUTORITATIVE_ML 0x0800000
	84	#define REINT_ONCE_NOML 0x1000000 /* Intuit can succed once only. */
	85	#define REINT_ONCE_ML 0x2000000
	86	#define RE_INTUIT_ONECHAR 0x4000000
	87	#define RE_INTUIT_TAIL 0x8000000
	88
	89	#define RE_USE_INTUIT (RE_USE_INTUIT_NOML\|RE_USE_INTUIT_ML)
	90	#define REINT_AUTORITATIVE (REINT_AUTORITATIVE_NOML\|REINT_AUTORITATIVE_ML)
	91	#define REINT_ONCE (REINT_ONCE_NOML\|REINT_ONCE_ML)
	92
c277df42	93	#define RX_MATCH_TAINTED(prog) ((prog)->reganch & ROPT_TAINTED_SEEN)
72311751 GS	94	#define RX_MATCH_TAINTED_on(prog) ((prog)->reganch \|= ROPT_TAINTED_SEEN)
	95	#define RX_MATCH_TAINTED_off(prog) ((prog)->reganch &= ~ROPT_TAINTED_SEEN)
	96	#define RX_MATCH_TAINTED_set(prog, t) ((t) \
	97	? RX_MATCH_TAINTED_on(prog) \
	98	: RX_MATCH_TAINTED_off(prog))
c277df42	99
cf93c79d IZ	100	#define RX_MATCH_COPIED(prog) ((prog)->reganch & ROPT_COPY_DONE)
	101	#define RX_MATCH_COPIED_on(prog) ((prog)->reganch \|= ROPT_COPY_DONE)
	102	#define RX_MATCH_COPIED_off(prog) ((prog)->reganch &= ~ROPT_COPY_DONE)
	103	#define RX_MATCH_COPIED_set(prog,t) ((t) \
	104	? RX_MATCH_COPIED_on(prog) \
	105	: RX_MATCH_COPIED_off(prog))
	106
f8c7b90f	107	#ifdef PERL_OLD_COPY_ON_WRITE
ed252734 NC	108	#define RX_MATCH_COPY_FREE(rx) \
	109	STMT_START {if (rx->saved_copy) { \
	110	SV_CHECK_THINKFIRST_COW_DROP(rx->saved_copy); \
	111	} \
	112	if (RX_MATCH_COPIED(rx)) { \
	113	Safefree(rx->subbeg); \
	114	RX_MATCH_COPIED_off(rx); \
	115	}} STMT_END
	116	#else
	117	#define RX_MATCH_COPY_FREE(rx) \
	118	STMT_START {if (RX_MATCH_COPIED(rx)) { \
	119	Safefree(rx->subbeg); \
	120	RX_MATCH_COPIED_off(rx); \
	121	}} STMT_END
	122	#endif
	123
a30b2f1f RGS	124	#define RX_MATCH_UTF8(prog) ((prog)->reganch & ROPT_MATCH_UTF8)
	125	#define RX_MATCH_UTF8_on(prog) ((prog)->reganch \|= ROPT_MATCH_UTF8)
	126	#define RX_MATCH_UTF8_off(prog) ((prog)->reganch &= ~ROPT_MATCH_UTF8)
	127	#define RX_MATCH_UTF8_set(prog, t) ((t) \
	128	? (RX_MATCH_UTF8_on(prog), (PL_reg_match_utf8 = 1)) \
	129	: (RX_MATCH_UTF8_off(prog), (PL_reg_match_utf8 = 0)))
	130
cad2e5aa JH	131	#define REXEC_COPY_STR 0x01 /* Need to copy the string. */
	132	#define REXEC_CHECKED 0x02 /* check_substr already checked. */
	133	#define REXEC_SCREAM 0x04 /* use scream table. */
	134	#define REXEC_IGNOREPOS 0x08 /* \G matches at start. */
cf93c79d	135	#define REXEC_NOT_FIRST 0x10 /* This is another iteration of //g. */
c277df42	136
155aba94	137	#define ReREFCNT_inc(re) ((void)(re && re->refcnt++), re)
cad2e5aa	138	#define ReREFCNT_dec(re) CALLREGFREE(aTHX_ re)
cf93c79d IZ	139
cf93c79d IZ	140	#define FBMcf_TAIL_DOLLAR 1
cad2e5aa JH	141	#define FBMcf_TAIL_DOLLARM 2
	142	#define FBMcf_TAIL_Z 4
	143	#define FBMcf_TAIL_z 8
	144	#define FBMcf_TAIL (FBMcf_TAIL_DOLLAR\|FBMcf_TAIL_DOLLARM\|FBMcf_TAIL_Z\|FBMcf_TAIL_z)
cf93c79d IZ	145
cf93c79d IZ	146	#define FBMrf_MULTILINE 1
cad2e5aa JH	147
cad2e5aa JH	148	struct re_scream_pos_data_s;
5d9a96ca DM	149
	150	/* an accepting state/position*/
	151	struct _reg_trie_accepted {
	152	U8 *endpos;
	153	U16 wordnum;
	154	};
	155	typedef struct _reg_trie_accepted reg_trie_accepted;
	156
3b0527fe DM	157	/* some basic information about the current match that is created by
	158	* Perl_regexec_flags and then passed to regtry(), regmatch() etc */
	159
	160	typedef struct {
	161	regexp *prog;
	162	char *bol;
	163	char *till;
	164	SV *sv;
	165	char *ganch;
	166	} regmatch_info;
	167
5d9a96ca DM	168
	169	/* structures for holding and saving the state maintained by regmatch() */
	170
	171	typedef I32 CHECKPOINT;
	172
5d9a96ca DM	173	typedef enum {
	174	resume_TRIE1,
	175	resume_TRIE2,
aa283a38	176	resume_EVAL,
5d9a96ca DM	177	resume_CURLYX,
	178	resume_WHILEM1,
	179	resume_WHILEM2,
	180	resume_WHILEM3,
	181	resume_WHILEM4,
	182	resume_WHILEM5,
	183	resume_WHILEM6,
	184	resume_CURLYM1,
	185	resume_CURLYM2,
	186	resume_CURLYM3,
5d9a96ca DM	187	resume_IFMATCH,
	188	resume_PLUS1,
	189	resume_PLUS2,
	190	resume_PLUS3,
aa283a38	191	resume_PLUS4
5d9a96ca DM	192	} regmatch_resume_states;
	193
	194
a0374537	195	typedef struct regmatch_state {
5d9a96ca DM	196
	197	/* these vars contain state that needs to be maintained
	198	* across the main while loop ... */
	199
	200	regmatch_resume_states resume_state; /* where to jump to on return */
	201	regnode scan; / Current node. */
	202	regnode next; / Next node. */
aa283a38	203	bool minmod; /* the next "{n,m}" is a "{n,m}?" */
5d9a96ca DM	204	bool sw; /* the condition value in (?(cond)a\|b) */
	205	int logical;
	206	I32 unwind; /* savestack index of current unwind block */
a0374537	207	struct regmatch_state cc; / current innermost curly state */
5d9a96ca DM	208	char *locinput;
5d9a96ca DM	209
e822a8b4	210	/* ... while the rest of these are local to an individual branch */
5d9a96ca DM	211
	212	I32 n; /* no or next */
	213	I32 ln; /* len or last */
e822a8b4 DM	214
e822a8b4 DM	215	union {
77cb431f DM	216
	217	/* this is a fake union member that matches the first element
	218	* of each member that needs to store positive backtrack
	219	* information */
	220	struct {
	221	struct regmatch_state *prev_yes_state;
	222	} yes;
	223
e822a8b4 DM	224	struct {
	225	reg_trie_accepted *accept_buff;
	226	U32 accepted; /* how many accepting states we have seen */
	227	} trie;
	228
	229	struct {
77cb431f DM	230	/* this first element must match u.yes */
77cb431f DM	231	struct regmatch_state *prev_yes_state;
aa283a38 DM	232	regexp *prev_rex;
	233	int toggleutf;
	234	CHECKPOINT cp; /* remember current savestack indexes */
	235	CHECKPOINT lastcp;
e822a8b4 DM	236	} eval;
	237
	238	struct {
	239	CHECKPOINT cp; /* remember current savestack indexes */
a0374537 DM	240	struct regmatch_state outercc; / outer CURLYX state if any */
	241
	242	/* these contain the current curly state, and are accessed
	243	* by subsequent WHILEMs */
	244	int parenfloor;/* how far back to strip paren data */
	245	int cur; /* how many instances of scan we've matched */
	246	int min; /* the minimal number of scans to match */
	247	int max; /* the maximal number of scans to match */
	248	regnode * scan; /* the thing to match */
	249	char * lastloc;/* where we started matching this scan */
e822a8b4 DM	250	} curlyx;
	251
	252	struct {
	253	CHECKPOINT cp; /* remember current savestack indexes */
	254	CHECKPOINT lastcp;
a0374537	255	struct regmatch_state *savecc;
e822a8b4 DM	256	char lastloc; / Detection of 0-len. */
	257	I32 cache_offset;
	258	I32 cache_bit;
	259	} whilem;
	260
	261	struct {
dad79028 DM	262	/* this first element must match u.yes */
dad79028 DM	263	struct regmatch_state *prev_yes_state;
e822a8b4 DM	264	I32 paren;
	265	I32 c1, c2; /* case fold search */
	266	CHECKPOINT lastcp;
	267	I32 l;
	268	I32 matches;
	269	I32 maxwanted;
0cadcf80	270	bool minmod;
e822a8b4 DM	271	} curlym;
	272
	273	struct {
	274	I32 paren;
	275	CHECKPOINT lastcp;
	276	I32 c1, c2; /* case fold search */
	277	char *e;
	278	char *old;
	279	int count;
	280	} plus; /* and CURLYN/CURLY/STAR */
dad79028 DM	281
	282	struct {
	283	/* this first element must match u.yes */
	284	struct regmatch_state *prev_yes_state;
	285	I32 wanted;
	286	} ifmatch; /* and SUSPEND/UNLESSM */
d8319b27	287	} u;
5d9a96ca DM	288	} regmatch_state;
	289
	290	/* how many regmatch_state structs to allocate as a single slab.
	291	* We do it in 4K blocks for efficiency. The "3" is 2 for the next/prev
	292	* pointers, plus 1 for any mythical malloc overhead. */
	293
	294	#define PERL_REGMATCH_SLAB_SLOTS \
	295	((4096 - 3 * sizeof (void*)) / sizeof(regmatch_state))
	296
	297	typedef struct regmatch_slab {
	298	regmatch_state states[PERL_REGMATCH_SLAB_SLOTS];
	299	struct regmatch_slab prev, next;
	300	} regmatch_slab;
1ade1aa1	301
46ab3289 NC	302	#define PL_reg_flags PL_reg_state.re_state_reg_flags
	303	#define PL_bostr PL_reg_state.re_state_bostr
	304	#define PL_reginput PL_reg_state.re_state_reginput
46ab3289 NC	305	#define PL_regeol PL_reg_state.re_state_regeol
	306	#define PL_regstartp PL_reg_state.re_state_regstartp
	307	#define PL_regendp PL_reg_state.re_state_regendp
	308	#define PL_reglastparen PL_reg_state.re_state_reglastparen
	309	#define PL_reglastcloseparen PL_reg_state.re_state_reglastcloseparen
46ab3289 NC	310	#define PL_reg_start_tmp PL_reg_state.re_state_reg_start_tmp
	311	#define PL_reg_start_tmpl PL_reg_state.re_state_reg_start_tmpl
	312	#define PL_reg_eval_set PL_reg_state.re_state_reg_eval_set
46ab3289	313	#define PL_regindent PL_reg_state.re_state_regindent
46ab3289 NC	314	#define PL_reg_match_utf8 PL_reg_state.re_state_reg_match_utf8
	315	#define PL_reg_magic PL_reg_state.re_state_reg_magic
	316	#define PL_reg_oldpos PL_reg_state.re_state_reg_oldpos
	317	#define PL_reg_oldcurpm PL_reg_state.re_state_reg_oldcurpm
	318	#define PL_reg_curpm PL_reg_state.re_state_reg_curpm
	319	#define PL_reg_oldsaved PL_reg_state.re_state_reg_oldsaved
	320	#define PL_reg_oldsavedlen PL_reg_state.re_state_reg_oldsavedlen
	321	#define PL_reg_maxiter PL_reg_state.re_state_reg_maxiter
	322	#define PL_reg_leftiter PL_reg_state.re_state_reg_leftiter
	323	#define PL_reg_poscache PL_reg_state.re_state_reg_poscache
	324	#define PL_reg_poscache_size PL_reg_state.re_state_reg_poscache_size
	325	#define PL_regsize PL_reg_state.re_state_regsize
	326	#define PL_reg_starttry PL_reg_state.re_state_reg_starttry
	327	#define PL_nrs PL_reg_state.re_state_nrs
	328
1ade1aa1 NC	329	struct re_save_state {
	330	U32 re_state_reg_flags; /* from regexec.c */
	331	char *re_state_bostr;
	332	char re_state_reginput; / String-input pointer. */
1ade1aa1 NC	333	char re_state_regeol; / End of input, for $ check. */
	334	I32 re_state_regstartp; / Pointer to startp array. */
	335	I32 re_state_regendp; / Ditto for endp. */
	336	U32 re_state_reglastparen; / Similarly for lastparen. */
	337	U32 re_state_reglastcloseparen; / Similarly for lastcloseparen. */
1ade1aa1 NC	338	char *re_state_reg_start_tmp; / from regexec.c */
	339	U32 re_state_reg_start_tmpl; /* from regexec.c */
	340	I32 re_state_reg_eval_set; /* from regexec.c */
1ade1aa1	341	int re_state_regindent; /* from regexec.c */
1ade1aa1 NC	342	bool re_state_reg_match_utf8; /* from regexec.c */
	343	MAGIC re_state_reg_magic; / from regexec.c */
	344	I32 re_state_reg_oldpos; /* from regexec.c */
	345	PMOP re_state_reg_oldcurpm; / from regexec.c */
	346	PMOP re_state_reg_curpm; / from regexec.c */
	347	char re_state_reg_oldsaved; / old saved substr during match */
	348	STRLEN re_state_reg_oldsavedlen; /* old length of saved substr during match */
	349	I32 re_state_reg_maxiter; /* max wait until caching pos */
	350	I32 re_state_reg_leftiter; /* wait until caching pos */
	351	char re_state_reg_poscache; / cache of pos of WHILEM */
	352	STRLEN re_state_reg_poscache_size; /* size of pos cache of WHILEM */
	353	I32 re_state_regsize; /* from regexec.c */
	354	char re_state_reg_starttry; / from regexec.c */
	355	#ifdef PERL_OLD_COPY_ON_WRITE
46ab3289	356	SV re_state_nrs; / was placeholder: unused since 5.8.0 (5.7.2 patch #12027 for bug ID 20010815.012). Used to save rx->saved_copy */
1ade1aa1 NC	357	#endif
	358	};
	359
	360	#define SAVESTACK_ALLOC_FOR_RE_SAVE_STATE \
	361	(1 + ((sizeof(struct re_save_state) - 1) / sizeof(*PL_savestack)))
	362	/*
	363	* Local variables:
	364	* c-indentation-style: bsd
	365	* c-basic-offset: 4
	366	* indent-tabs-mode: t
	367	* End:
	368	*
	369	* ex: set ts=8 sts=4 sw=4 noet:
	370	*/