X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=regexp.h;h=a2e0fc1a31cf76d191846b659c84adb3c0f2a0aa;hb=798b63bc924a07589315b3229311582adce06136;hp=9da5bd47e02d34e97fff1987cd537b2abfc0f0c6;hpb=cf93c79d660ae36ccc5f83d949c599473fc522ce;p=p5sagit%2Fp5-mst-13.2.git diff --git a/regexp.h b/regexp.h index 9da5bd4..a2e0fc1 100644 --- a/regexp.h +++ b/regexp.h @@ -1,4 +1,11 @@ /* regexp.h + * + * Copyright (C) 1993, 1994, 1996, 1997, 1999, 2000, 2001, 2003, + * 2005, 2006 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. + * */ /* @@ -7,7 +14,9 @@ * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof], * not the System V one. */ - +#ifndef PLUGGABLE_RE_EXTENSION +/* we don't want to include this stuff if we are inside of + an external regex engine based on the core one - like re 'debug'*/ struct regnode { U8 flags; @@ -17,109 +26,442 @@ struct regnode { typedef struct regnode regnode; -struct reg_data { - U32 count; - U8 *what; - void* data[1]; -}; +struct reg_substr_data; + +struct reg_data; + +struct regexp_engine; struct reg_substr_datum { I32 min_offset; I32 max_offset; - SV *substr; + SV *substr; /* non-utf8 variant */ + SV *utf8_substr; /* utf8 variant */ + I32 end_shift; }; - struct reg_substr_data { struct reg_substr_datum data[3]; /* Actual array */ }; -typedef struct regexp { - I32 *startp; - I32 *endp; - regnode *regstclass; -#if 0 - SV *anchored_substr; /* Substring at fixed position wrt start. */ - I32 anchored_offset; /* Position of it. */ - SV *float_substr; /* Substring at variable position wrt start. */ - I32 float_min_offset; /* Minimal position of it. */ - I32 float_max_offset; /* Maximal position of it. */ - SV *check_substr; /* Substring to check before matching. */ - I32 check_offset_min; /* Offset of the above. */ - I32 check_offset_max; /* Offset of the above. */ +#ifdef PERL_OLD_COPY_ON_WRITE +#define SV_SAVED_COPY SV *saved_copy; /* If non-NULL, SV which is COW from original */ #else - struct reg_substr_data *substrs; +#define SV_SAVED_COPY #endif - char *precomp; /* pre-compilation regular expression */ - struct reg_data *data; /* Additional data. */ +/* this is ordered such that the most commonly used + fields are at the start of the struct */ +typedef struct regexp { + /* what engine created this regexp? */ + const struct regexp_engine* engine; + + /* Information about the match that the perl core uses to manage things */ + U32 extflags; /* Flags used both externally and internally */ + I32 minlen; /* mininum possible length of string to match */ + I32 minlenret; /* mininum possible length of $& */ + U32 gofs; /* chars left of pos that we search from */ + struct reg_substr_data *substrs; /* substring data about strings that must appear + in the final match, used for optimisations */ + U32 nparens; /* number of capture buffers */ + + /* private engine specific data */ + U32 intflags; /* Engine Specific Internal flags */ + void *pprivate; /* Data private to the regex engine which + created this object. */ + + /* Data about the last/current match. These are modified during matching*/ + U32 lastparen; /* last open paren matched */ + U32 lastcloseparen; /* last close paren matched */ + I32 *startp; /* Array of offsets from start of string (@-) */ + I32 *endp; /* Array of offsets from start of string (@+) */ char *subbeg; /* saved or original string so \digit works forever. */ I32 sublen; /* Length of string pointed by subbeg */ - I32 refcnt; - I32 minlen; /* mininum possible length of $& */ + SV_SAVED_COPY /* If non-NULL, SV which is COW from original */ + + + /* Information about the match that isn't often used */ + char *precomp; /* pre-compilation regular expression */ I32 prelen; /* length of precomp */ - U32 nparens; /* number of parentheses */ - U32 lastparen; /* last paren matched */ - U32 reganch; /* Internal use only + - Tainted information used by regexec? */ - regnode program[1]; /* Unwarranted chumminess with compiler. */ + I32 seen_evals; /* number of eval groups in the pattern - for security checks */ + HV *paren_names; /* Optional hash of paren names */ + + /* Refcount of this regexp */ + I32 refcnt; /* Refcount of this regexp */ } regexp; -#define anchored_substr substrs->data[0].substr -#define anchored_offset substrs->data[0].min_offset -#define float_substr substrs->data[1].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_offset_min substrs->data[2].min_offset -#define check_offset_max substrs->data[2].max_offset - -#define ROPT_ANCH (ROPT_ANCH_BOL|ROPT_ANCH_MBOL|ROPT_ANCH_GPOS) -#define ROPT_ANCH_SINGLE (ROPT_ANCH_BOL|ROPT_ANCH_GPOS) -#define ROPT_ANCH_BOL 0x00001 -#define ROPT_ANCH_MBOL 0x00002 -#define ROPT_ANCH_GPOS 0x00004 -#define ROPT_SKIP 0x00008 -#define ROPT_IMPLICIT 0x00010 /* Converted .* to ^.* */ -#define ROPT_NOSCAN 0x00020 /* Check-string always at start. */ -#define ROPT_GPOS_SEEN 0x00040 -#define ROPT_CHECK_ALL 0x00080 -#define ROPT_LOOKBEHIND_SEEN 0x00100 -#define ROPT_EVAL_SEEN 0x00200 -#define ROPT_TAINTED_SEEN 0x00400 -#define ROPT_ANCH_SBOL 0x00800 - -/* 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 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) +/* used for high speed searches */ +typedef struct re_scream_pos_data_s +{ + char **scream_olds; /* match pos */ + I32 *scream_pos; /* Internal iterator of scream. */ +} re_scream_pos_data; + +/* regexp_engine structure. This is the dispatch table for regexes. + * Any regex engine implementation must be able to build one of these. + */ +typedef struct regexp_engine { + regexp* (*comp) (pTHX_ char* exp, char* xend, PMOP* pm); + I32 (*exec) (pTHX_ regexp* prog, char* stringarg, char* strend, + char* strbeg, I32 minend, SV* screamer, + void* data, U32 flags); + char* (*intuit) (pTHX_ regexp *prog, SV *sv, char *strpos, + char *strend, U32 flags, + struct re_scream_pos_data_s *data); + SV* (*checkstr) (pTHX_ regexp *prog); + void (*free) (pTHX_ struct regexp* r); +#ifdef USE_ITHREADS + void* (*dupe) (pTHX_ const regexp *r, CLONE_PARAMS *param); +#endif +} regexp_engine; + +/* Flags stored in regexp->extflags + * These are used by code external to the regexp engine + * + * Note that flags starting with RXf_PMf_ have exact equivalents + * stored in op_pmflags and which are defined in op.h, they are defined + * numerically here only for clarity. + */ + +/* Anchor and GPOS related stuff */ +#define RXf_ANCH_BOL 0x00000001 +#define RXf_ANCH_MBOL 0x00000002 +#define RXf_ANCH_SBOL 0x00000004 +#define RXf_ANCH_GPOS 0x00000008 +#define RXf_GPOS_SEEN 0x00000010 +#define RXf_GPOS_FLOAT 0x00000020 +/* two bits here */ +#define RXf_ANCH (RXf_ANCH_BOL|RXf_ANCH_MBOL|RXf_ANCH_GPOS|RXf_ANCH_SBOL) +#define RXf_GPOS_CHECK (RXf_GPOS_SEEN|RXf_ANCH_GPOS) +#define RXf_ANCH_SINGLE (RXf_ANCH_SBOL|RXf_ANCH_GPOS) + +/* Flags indicating special patterns */ +#define RXf_START_ONLY 0x00000200 /* Pattern is /^/ */ +#define RXf_WHITE 0x00000400 /* Pattern is /\s+/ */ + +/* 0xF800 of extflags is used by (RXf_)PMf_COMPILETIME */ +#define RXf_PMf_LOCALE 0x00000800 /* use locale */ +#define RXf_PMf_MULTILINE 0x00001000 /* /m */ +#define RXf_PMf_SINGLELINE 0x00002000 /* /s */ +#define RXf_PMf_FOLD 0x00004000 /* /i */ +#define RXf_PMf_EXTENDED 0x00008000 /* /x */ +#define RXf_PMf_KEEPCOPY 0x00010000 /* /k */ +/* these flags are transfered from the PMOP->op_pmflags member during compilation */ +#define RXf_PMf_STD_PMMOD (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_FOLD|RXf_PMf_EXTENDED) +#define RXf_PMf_COMPILETIME (RXf_PMf_MULTILINE|RXf_PMf_SINGLELINE|RXf_PMf_LOCALE|RXf_PMf_FOLD|RXf_PMf_EXTENDED|RXf_PMf_KEEPCOPY) + +#define CASE_STD_PMMOD_FLAGS_PARSE_SET(pmfl) \ + case IGNORE_PAT_MOD: *(pmfl) |= RXf_PMf_FOLD; break; \ + case MULTILINE_PAT_MOD: *(pmfl) |= RXf_PMf_MULTILINE; break; \ + case SINGLE_PAT_MOD: *(pmfl) |= RXf_PMf_SINGLELINE; break; \ + case XTENDED_PAT_MOD: *(pmfl) |= RXf_PMf_EXTENDED; break + +/* What we have seen */ +#define RXf_LOOKBEHIND_SEEN 0x00020000 +#define RXf_EVAL_SEEN 0x00040000 +#define RXf_CANY_SEEN 0x00080000 + +/* Special */ +#define RXf_NOSCAN 0x00100000 +#define RXf_CHECK_ALL 0x00200000 + +/* UTF8 related */ +#define RXf_UTF8 0x00400000 +#define RXf_MATCH_UTF8 0x00800000 + +/* Intuit related */ +#define RXf_USE_INTUIT_NOML 0x01000000 +#define RXf_USE_INTUIT_ML 0x02000000 +#define RXf_INTUIT_TAIL 0x04000000 +/* one bit here */ +#define RXf_USE_INTUIT (RXf_USE_INTUIT_NOML|RXf_USE_INTUIT_ML) + +/* Copy and tainted info */ +#define RXf_COPY_DONE 0x10000000 +#define RXf_TAINTED_SEEN 0x20000000 +/* two bits here */ + + +#define RX_HAS_CUTGROUP(prog) ((prog)->intflags & PREGf_CUTGROUP_SEEN) +#define RX_MATCH_TAINTED(prog) ((prog)->extflags & RXf_TAINTED_SEEN) +#define RX_MATCH_TAINTED_on(prog) ((prog)->extflags |= RXf_TAINTED_SEEN) +#define RX_MATCH_TAINTED_off(prog) ((prog)->extflags &= ~RXf_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(prog) ((prog)->extflags & RXf_COPY_DONE) +#define RX_MATCH_COPIED_on(prog) ((prog)->extflags |= RXf_COPY_DONE) +#define RX_MATCH_COPIED_off(prog) ((prog)->extflags &= ~RXf_COPY_DONE) #define RX_MATCH_COPIED_set(prog,t) ((t) \ ? RX_MATCH_COPIED_on(prog) \ : RX_MATCH_COPIED_off(prog)) -#define REXEC_COPY_STR 1 /* Need to copy the string. */ -#define REXEC_CHECKED 2 /* check_substr already checked. */ -#define REXEC_SCREAM 4 /* use scream table. */ -#define REXEC_IGNOREPOS 8 /* \G matches at start. */ +#endif /* PLUGGABLE_RE_EXTENSION */ + +/* Stuff that needs to be included in the plugable extension goes below here */ + +#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)->extflags & RXf_MATCH_UTF8) +#define RX_MATCH_UTF8_on(prog) ((prog)->extflags |= RXf_MATCH_UTF8) +#define RX_MATCH_UTF8_off(prog) ((prog)->extflags &= ~RXf_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) ((re && re->refcnt++), re) -#define ReREFCNT_dec(re) pregfree(re) +#define ReREFCNT_inc(re) ((void)(re && re->refcnt++), re) +#define ReREFCNT_dec(re) CALLREGFREE(re) #define FBMcf_TAIL_DOLLAR 1 -#define FBMcf_TAIL_Z 2 -#define FBMcf_TAIL_z 4 -#define FBMcf_TAIL (FBMcf_TAIL_DOLLAR|FBMcf_TAIL_Z|FBMcf_TAIL_z) +#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 + +/* 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; + char *cutpoint; +} regmatch_info; + + +/* structures for holding and saving the state maintained by regmatch() */ + +#define MAX_RECURSE_EVAL_NOCHANGE_DEPTH 50 + +typedef I32 CHECKPOINT; + +typedef struct regmatch_state { + int resume_state; /* where to jump to on return */ + char *locinput; /* where to backtrack in string on failure */ + + 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 { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + reg_trie_accepted *accept_buff; + U32 accepted; /* how many accepting states we have seen */ + U16 *jump; /* positive offsets from me */ + regnode *B; /* node following the trie */ + regnode *me; /* Which node am I - needed for jump tries*/ + } trie; + + struct { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + struct regmatch_state *prev_eval; + struct regmatch_state *prev_curlyx; + regexp *prev_rex; + U32 toggle_reg_flags; /* what bits in PL_reg_flags to + flip when transitioning between + inner and outer rexen */ + CHECKPOINT cp; /* remember current savestack indexes */ + CHECKPOINT lastcp; + regnode *B; /* the node following us */ + U32 close_paren; /* which close bracket is our end */ + } eval; + + struct { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + struct regmatch_state *prev_curlyx; /* previous cur_curlyx */ + CHECKPOINT cp; /* remember current savestack index */ + bool minmod; + int parenfloor;/* how far back to strip paren data */ + int min; /* the minimal number of A's to match */ + int max; /* the maximal number of A's to match */ + regnode *A, *B; /* the nodes corresponding to /A*B/ */ + + /* these two are modified by WHILEM */ + int count; /* how many instances of A we've matched */ + char *lastloc;/* where previous A matched (0-len detect) */ + } curlyx; + + struct { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + struct regmatch_state *save_curlyx; + CHECKPOINT cp; /* remember current savestack indexes */ + CHECKPOINT lastcp; + char *save_lastloc; /* previous curlyx.lastloc */ + I32 cache_offset; + I32 cache_mask; + } whilem; + + struct { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + U32 lastparen; + regnode *next_branch; /* next branch node */ + CHECKPOINT cp; + } branch; + + struct { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + I32 c1, c2; /* case fold search */ + CHECKPOINT cp; + I32 alen; /* length of first-matched A string */ + I32 count; + bool minmod; + regnode *A, *B; /* the nodes corresponding to /A*B/ */ + regnode *me; /* the curlym node */ + } curlym; + + struct { + U32 paren; + CHECKPOINT cp; + I32 c1, c2; /* case fold search */ + char *maxpos; /* highest possible point in string to match */ + char *oldloc; /* the previous locinput */ + int count; + int min, max; /* {m,n} */ + regnode *A, *B; /* the nodes corresponding to /A*B/ */ + } curly; /* and CURLYN/PLUS/STAR */ + + struct { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + I32 wanted; + I32 logical; /* saved copy of 'logical' var */ + regnode *me; /* the IFMATCH/SUSPEND/UNLESSM node */ + } ifmatch; /* and SUSPEND/UNLESSM */ + + struct { + /* this first element must match u.yes */ + struct regmatch_state *prev_yes_state; + struct regmatch_state *prev_mark; + SV* mark_name; + char *mark_loc; + } mark; + + struct { + int val; + } keeper; + } 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_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 */ + 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 */ + U32 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: + */