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regcomp.c
18202 lines (16230 loc) · 671 KB
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regcomp.c
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/* regcomp.c
*/
/*
* 'A fair jaw-cracker dwarf-language must be.' --Samwise Gamgee
*
* [p.285 of _The Lord of the Rings_, II/iii: "The Ring Goes South"]
*/
/* This file contains functions for compiling a regular expression. See
* also regexec.c which funnily enough, contains functions for executing
* a regular expression.
*
* This file is also copied at build time to ext/re/re_comp.c, where
* it's built with -DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT.
* This causes the main functions to be compiled under new names and with
* debugging support added, which makes "use re 'debug'" work.
*/
/* NOTE: this is derived from Henry Spencer's regexp code, and should not
* confused with the original package (see point 3 below). Thanks, Henry!
*/
/* Additional note: this code is very heavily munged from Henry's version
* in places. In some spots I've traded clarity for efficiency, so don't
* blame Henry for some of the lack of readability.
*/
/* The names of the functions have been changed from regcomp and
* regexec to pregcomp and pregexec in order to avoid conflicts
* with the POSIX routines of the same names.
*/
#ifdef PERL_EXT_RE_BUILD
#include "re_top.h"
#endif
/*
* pregcomp and pregexec -- regsub and regerror are not used in perl
*
* Copyright (c) 1986 by University of Toronto.
* Written by Henry Spencer. Not derived from licensed software.
*
* Permission is granted to anyone to use this software for any
* purpose on any computer system, and to redistribute it freely,
* subject to the following restrictions:
*
* 1. The author is not responsible for the consequences of use of
* this software, no matter how awful, even if they arise
* from defects in it.
*
* 2. The origin of this software must not be misrepresented, either
* by explicit claim or by omission.
*
* 3. Altered versions must be plainly marked as such, and must not
* be misrepresented as being the original software.
*
*
**** Alterations to Henry's code are...
****
**** Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
**** 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
**** 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.
*
* Beware that some of this code is subtly aware of the way operator
* precedence is structured in regular expressions. Serious changes in
* regular-expression syntax might require a total rethink.
*/
#include "EXTERN.h"
#define PERL_IN_REGCOMP_C
#include "perl.h"
#ifndef PERL_IN_XSUB_RE
# include "INTERN.h"
#endif
#define REG_COMP_C
#ifdef PERL_IN_XSUB_RE
# include "re_comp.h"
EXTERN_C const struct regexp_engine my_reg_engine;
#else
# include "regcomp.h"
#endif
#include "dquote_static.c"
#include "inline_invlist.c"
#include "unicode_constants.h"
#define HAS_NONLATIN1_FOLD_CLOSURE(i) \
_HAS_NONLATIN1_FOLD_CLOSURE_ONLY_FOR_USE_BY_REGCOMP_DOT_C_AND_REGEXEC_DOT_C(i)
#define HAS_NONLATIN1_SIMPLE_FOLD_CLOSURE(i) \
_HAS_NONLATIN1_SIMPLE_FOLD_CLOSURE_ONLY_FOR_USE_BY_REGCOMP_DOT_C_AND_REGEXEC_DOT_C(i)
#define IS_NON_FINAL_FOLD(c) _IS_NON_FINAL_FOLD_ONLY_FOR_USE_BY_REGCOMP_DOT_C(c)
#define IS_IN_SOME_FOLD_L1(c) _IS_IN_SOME_FOLD_ONLY_FOR_USE_BY_REGCOMP_DOT_C(c)
#ifndef STATIC
#define STATIC static
#endif
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/* this is a chain of data about sub patterns we are processing that
need to be handled separately/specially in study_chunk. Its so
we can simulate recursion without losing state. */
struct scan_frame;
typedef struct scan_frame {
regnode *last_regnode; /* last node to process in this frame */
regnode *next_regnode; /* next node to process when last is reached */
U32 prev_recursed_depth;
I32 stopparen; /* what stopparen do we use */
U32 is_top_frame; /* what flags do we use? */
struct scan_frame *this_prev_frame; /* this previous frame */
struct scan_frame *prev_frame; /* previous frame */
struct scan_frame *next_frame; /* next frame */
} scan_frame;
/* Certain characters are output as a sequence with the first being a
* backslash. */
#define isBACKSLASHED_PUNCT(c) \
((c) == '-' || (c) == ']' || (c) == '\\' || (c) == '^')
struct RExC_state_t {
U32 flags; /* RXf_* are we folding, multilining? */
U32 pm_flags; /* PMf_* stuff from the calling PMOP */
char *precomp; /* uncompiled string. */
REGEXP *rx_sv; /* The SV that is the regexp. */
regexp *rx; /* perl core regexp structure */
regexp_internal *rxi; /* internal data for regexp object
pprivate field */
char *start; /* Start of input for compile */
char *end; /* End of input for compile */
char *parse; /* Input-scan pointer. */
SSize_t whilem_seen; /* number of WHILEM in this expr */
regnode *emit_start; /* Start of emitted-code area */
regnode *emit_bound; /* First regnode outside of the
allocated space */
regnode *emit; /* Code-emit pointer; if = &emit_dummy,
implies compiling, so don't emit */
regnode_ssc emit_dummy; /* placeholder for emit to point to;
large enough for the largest
non-EXACTish node, so can use it as
scratch in pass1 */
I32 naughty; /* How bad is this pattern? */
I32 sawback; /* Did we see \1, ...? */
U32 seen;
SSize_t size; /* Code size. */
I32 npar; /* Capture buffer count, (OPEN) plus
one. ("par" 0 is the whole
pattern)*/
I32 nestroot; /* root parens we are in - used by
accept */
I32 extralen;
I32 seen_zerolen;
regnode **open_parens; /* pointers to open parens */
regnode **close_parens; /* pointers to close parens */
regnode *opend; /* END node in program */
I32 utf8; /* whether the pattern is utf8 or not */
I32 orig_utf8; /* whether the pattern was originally in utf8 */
/* XXX use this for future optimisation of case
* where pattern must be upgraded to utf8. */
I32 uni_semantics; /* If a d charset modifier should use unicode
rules, even if the pattern is not in
utf8 */
HV *paren_names; /* Paren names */
regnode **recurse; /* Recurse regops */
I32 recurse_count; /* Number of recurse regops */
U8 *study_chunk_recursed; /* bitmap of which subs we have moved
through */
U32 study_chunk_recursed_bytes; /* bytes in bitmap */
I32 in_lookbehind;
I32 contains_locale;
I32 contains_i;
I32 override_recoding;
#ifdef EBCDIC
I32 recode_x_to_native;
#endif
I32 in_multi_char_class;
struct reg_code_block *code_blocks; /* positions of literal (?{})
within pattern */
int num_code_blocks; /* size of code_blocks[] */
int code_index; /* next code_blocks[] slot */
SSize_t maxlen; /* mininum possible number of chars in string to match */
scan_frame *frame_head;
scan_frame *frame_last;
U32 frame_count;
U32 strict;
#ifdef ADD_TO_REGEXEC
char *starttry; /* -Dr: where regtry was called. */
#define RExC_starttry (pRExC_state->starttry)
#endif
SV *runtime_code_qr; /* qr with the runtime code blocks */
#ifdef DEBUGGING
const char *lastparse;
I32 lastnum;
AV *paren_name_list; /* idx -> name */
U32 study_chunk_recursed_count;
SV *mysv1;
SV *mysv2;
#define RExC_lastparse (pRExC_state->lastparse)
#define RExC_lastnum (pRExC_state->lastnum)
#define RExC_paren_name_list (pRExC_state->paren_name_list)
#define RExC_study_chunk_recursed_count (pRExC_state->study_chunk_recursed_count)
#define RExC_mysv (pRExC_state->mysv1)
#define RExC_mysv1 (pRExC_state->mysv1)
#define RExC_mysv2 (pRExC_state->mysv2)
#endif
};
#define RExC_flags (pRExC_state->flags)
#define RExC_pm_flags (pRExC_state->pm_flags)
#define RExC_precomp (pRExC_state->precomp)
#define RExC_rx_sv (pRExC_state->rx_sv)
#define RExC_rx (pRExC_state->rx)
#define RExC_rxi (pRExC_state->rxi)
#define RExC_start (pRExC_state->start)
#define RExC_end (pRExC_state->end)
#define RExC_parse (pRExC_state->parse)
#define RExC_whilem_seen (pRExC_state->whilem_seen)
#ifdef RE_TRACK_PATTERN_OFFSETS
#define RExC_offsets (pRExC_state->rxi->u.offsets) /* I am not like the
others */
#endif
#define RExC_emit (pRExC_state->emit)
#define RExC_emit_dummy (pRExC_state->emit_dummy)
#define RExC_emit_start (pRExC_state->emit_start)
#define RExC_emit_bound (pRExC_state->emit_bound)
#define RExC_sawback (pRExC_state->sawback)
#define RExC_seen (pRExC_state->seen)
#define RExC_size (pRExC_state->size)
#define RExC_maxlen (pRExC_state->maxlen)
#define RExC_npar (pRExC_state->npar)
#define RExC_nestroot (pRExC_state->nestroot)
#define RExC_extralen (pRExC_state->extralen)
#define RExC_seen_zerolen (pRExC_state->seen_zerolen)
#define RExC_utf8 (pRExC_state->utf8)
#define RExC_uni_semantics (pRExC_state->uni_semantics)
#define RExC_orig_utf8 (pRExC_state->orig_utf8)
#define RExC_open_parens (pRExC_state->open_parens)
#define RExC_close_parens (pRExC_state->close_parens)
#define RExC_opend (pRExC_state->opend)
#define RExC_paren_names (pRExC_state->paren_names)
#define RExC_recurse (pRExC_state->recurse)
#define RExC_recurse_count (pRExC_state->recurse_count)
#define RExC_study_chunk_recursed (pRExC_state->study_chunk_recursed)
#define RExC_study_chunk_recursed_bytes \
(pRExC_state->study_chunk_recursed_bytes)
#define RExC_in_lookbehind (pRExC_state->in_lookbehind)
#define RExC_contains_locale (pRExC_state->contains_locale)
#define RExC_contains_i (pRExC_state->contains_i)
#define RExC_override_recoding (pRExC_state->override_recoding)
#ifdef EBCDIC
# define RExC_recode_x_to_native (pRExC_state->recode_x_to_native)
#endif
#define RExC_in_multi_char_class (pRExC_state->in_multi_char_class)
#define RExC_frame_head (pRExC_state->frame_head)
#define RExC_frame_last (pRExC_state->frame_last)
#define RExC_frame_count (pRExC_state->frame_count)
#define RExC_strict (pRExC_state->strict)
/* Heuristic check on the complexity of the pattern: if TOO_NAUGHTY, we set
* a flag to disable back-off on the fixed/floating substrings - if it's
* a high complexity pattern we assume the benefit of avoiding a full match
* is worth the cost of checking for the substrings even if they rarely help.
*/
#define RExC_naughty (pRExC_state->naughty)
#define TOO_NAUGHTY (10)
#define MARK_NAUGHTY(add) \
if (RExC_naughty < TOO_NAUGHTY) \
RExC_naughty += (add)
#define MARK_NAUGHTY_EXP(exp, add) \
if (RExC_naughty < TOO_NAUGHTY) \
RExC_naughty += RExC_naughty / (exp) + (add)
#define ISMULT1(c) ((c) == '*' || (c) == '+' || (c) == '?')
#define ISMULT2(s) ((*s) == '*' || (*s) == '+' || (*s) == '?' || \
((*s) == '{' && regcurly(s)))
/*
* Flags to be passed up and down.
*/
#define WORST 0 /* Worst case. */
#define HASWIDTH 0x01 /* Known to match non-null strings. */
/* Simple enough to be STAR/PLUS operand; in an EXACTish node must be a single
* character. (There needs to be a case: in the switch statement in regexec.c
* for any node marked SIMPLE.) Note that this is not the same thing as
* REGNODE_SIMPLE */
#define SIMPLE 0x02
#define SPSTART 0x04 /* Starts with * or + */
#define POSTPONED 0x08 /* (?1),(?&name), (??{...}) or similar */
#define TRYAGAIN 0x10 /* Weeded out a declaration. */
#define RESTART_UTF8 0x20 /* Restart, need to calcuate sizes as UTF-8 */
#define REG_NODE_NUM(x) ((x) ? (int)((x)-RExC_emit_start) : -1)
/* whether trie related optimizations are enabled */
#if PERL_ENABLE_EXTENDED_TRIE_OPTIMISATION
#define TRIE_STUDY_OPT
#define FULL_TRIE_STUDY
#define TRIE_STCLASS
#endif
#define PBYTE(u8str,paren) ((U8*)(u8str))[(paren) >> 3]
#define PBITVAL(paren) (1 << ((paren) & 7))
#define PAREN_TEST(u8str,paren) ( PBYTE(u8str,paren) & PBITVAL(paren))
#define PAREN_SET(u8str,paren) PBYTE(u8str,paren) |= PBITVAL(paren)
#define PAREN_UNSET(u8str,paren) PBYTE(u8str,paren) &= (~PBITVAL(paren))
#define REQUIRE_UTF8 STMT_START { \
if (!UTF) { \
*flagp = RESTART_UTF8; \
return NULL; \
} \
} STMT_END
/* This converts the named class defined in regcomp.h to its equivalent class
* number defined in handy.h. */
#define namedclass_to_classnum(class) ((int) ((class) / 2))
#define classnum_to_namedclass(classnum) ((classnum) * 2)
#define _invlist_union_complement_2nd(a, b, output) \
_invlist_union_maybe_complement_2nd(a, b, TRUE, output)
#define _invlist_intersection_complement_2nd(a, b, output) \
_invlist_intersection_maybe_complement_2nd(a, b, TRUE, output)
/* About scan_data_t.
During optimisation we recurse through the regexp program performing
various inplace (keyhole style) optimisations. In addition study_chunk
and scan_commit populate this data structure with information about
what strings MUST appear in the pattern. We look for the longest
string that must appear at a fixed location, and we look for the
longest string that may appear at a floating location. So for instance
in the pattern:
/FOO[xX]A.*B[xX]BAR/
Both 'FOO' and 'A' are fixed strings. Both 'B' and 'BAR' are floating
strings (because they follow a .* construct). study_chunk will identify
both FOO and BAR as being the longest fixed and floating strings respectively.
The strings can be composites, for instance
/(f)(o)(o)/
will result in a composite fixed substring 'foo'.
For each string some basic information is maintained:
- offset or min_offset
This is the position the string must appear at, or not before.
It also implicitly (when combined with minlenp) tells us how many
characters must match before the string we are searching for.
Likewise when combined with minlenp and the length of the string it
tells us how many characters must appear after the string we have
found.
- max_offset
Only used for floating strings. This is the rightmost point that
the string can appear at. If set to SSize_t_MAX it indicates that the
string can occur infinitely far to the right.
- minlenp
A pointer to the minimum number of characters of the pattern that the
string was found inside. This is important as in the case of positive
lookahead or positive lookbehind we can have multiple patterns
involved. Consider
/(?=FOO).*F/
The minimum length of the pattern overall is 3, the minimum length
of the lookahead part is 3, but the minimum length of the part that
will actually match is 1. So 'FOO's minimum length is 3, but the
minimum length for the F is 1. This is important as the minimum length
is used to determine offsets in front of and behind the string being
looked for. Since strings can be composites this is the length of the
pattern at the time it was committed with a scan_commit. Note that
the length is calculated by study_chunk, so that the minimum lengths
are not known until the full pattern has been compiled, thus the
pointer to the value.
- lookbehind
In the case of lookbehind the string being searched for can be
offset past the start point of the final matching string.
If this value was just blithely removed from the min_offset it would
invalidate some of the calculations for how many chars must match
before or after (as they are derived from min_offset and minlen and
the length of the string being searched for).
When the final pattern is compiled and the data is moved from the
scan_data_t structure into the regexp structure the information
about lookbehind is factored in, with the information that would
have been lost precalculated in the end_shift field for the
associated string.
The fields pos_min and pos_delta are used to store the minimum offset
and the delta to the maximum offset at the current point in the pattern.
*/
typedef struct scan_data_t {
/*I32 len_min; unused */
/*I32 len_delta; unused */
SSize_t pos_min;
SSize_t pos_delta;
SV *last_found;
SSize_t last_end; /* min value, <0 unless valid. */
SSize_t last_start_min;
SSize_t last_start_max;
SV **longest; /* Either &l_fixed, or &l_float. */
SV *longest_fixed; /* longest fixed string found in pattern */
SSize_t offset_fixed; /* offset where it starts */
SSize_t *minlen_fixed; /* pointer to the minlen relevant to the string */
I32 lookbehind_fixed; /* is the position of the string modfied by LB */
SV *longest_float; /* longest floating string found in pattern */
SSize_t offset_float_min; /* earliest point in string it can appear */
SSize_t offset_float_max; /* latest point in string it can appear */
SSize_t *minlen_float; /* pointer to the minlen relevant to the string */
SSize_t lookbehind_float; /* is the pos of the string modified by LB */
I32 flags;
I32 whilem_c;
SSize_t *last_closep;
regnode_ssc *start_class;
} scan_data_t;
/*
* Forward declarations for pregcomp()'s friends.
*/
static const scan_data_t zero_scan_data =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
#define SF_BEFORE_EOL (SF_BEFORE_SEOL|SF_BEFORE_MEOL)
#define SF_BEFORE_SEOL 0x0001
#define SF_BEFORE_MEOL 0x0002
#define SF_FIX_BEFORE_EOL (SF_FIX_BEFORE_SEOL|SF_FIX_BEFORE_MEOL)
#define SF_FL_BEFORE_EOL (SF_FL_BEFORE_SEOL|SF_FL_BEFORE_MEOL)
#define SF_FIX_SHIFT_EOL (+2)
#define SF_FL_SHIFT_EOL (+4)
#define SF_FIX_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FIX_SHIFT_EOL)
#define SF_FIX_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FIX_SHIFT_EOL)
#define SF_FL_BEFORE_SEOL (SF_BEFORE_SEOL << SF_FL_SHIFT_EOL)
#define SF_FL_BEFORE_MEOL (SF_BEFORE_MEOL << SF_FL_SHIFT_EOL) /* 0x20 */
#define SF_IS_INF 0x0040
#define SF_HAS_PAR 0x0080
#define SF_IN_PAR 0x0100
#define SF_HAS_EVAL 0x0200
#define SCF_DO_SUBSTR 0x0400
#define SCF_DO_STCLASS_AND 0x0800
#define SCF_DO_STCLASS_OR 0x1000
#define SCF_DO_STCLASS (SCF_DO_STCLASS_AND|SCF_DO_STCLASS_OR)
#define SCF_WHILEM_VISITED_POS 0x2000
#define SCF_TRIE_RESTUDY 0x4000 /* Do restudy? */
#define SCF_SEEN_ACCEPT 0x8000
#define SCF_TRIE_DOING_RESTUDY 0x10000
#define SCF_IN_DEFINE 0x20000
#define UTF cBOOL(RExC_utf8)
/* The enums for all these are ordered so things work out correctly */
#define LOC (get_regex_charset(RExC_flags) == REGEX_LOCALE_CHARSET)
#define DEPENDS_SEMANTICS (get_regex_charset(RExC_flags) \
== REGEX_DEPENDS_CHARSET)
#define UNI_SEMANTICS (get_regex_charset(RExC_flags) == REGEX_UNICODE_CHARSET)
#define AT_LEAST_UNI_SEMANTICS (get_regex_charset(RExC_flags) \
>= REGEX_UNICODE_CHARSET)
#define ASCII_RESTRICTED (get_regex_charset(RExC_flags) \
== REGEX_ASCII_RESTRICTED_CHARSET)
#define AT_LEAST_ASCII_RESTRICTED (get_regex_charset(RExC_flags) \
>= REGEX_ASCII_RESTRICTED_CHARSET)
#define ASCII_FOLD_RESTRICTED (get_regex_charset(RExC_flags) \
== REGEX_ASCII_MORE_RESTRICTED_CHARSET)
#define FOLD cBOOL(RExC_flags & RXf_PMf_FOLD)
/* For programs that want to be strictly Unicode compatible by dying if any
* attempt is made to match a non-Unicode code point against a Unicode
* property. */
#define ALWAYS_WARN_SUPER ckDEAD(packWARN(WARN_NON_UNICODE))
#define OOB_NAMEDCLASS -1
/* There is no code point that is out-of-bounds, so this is problematic. But
* its only current use is to initialize a variable that is always set before
* looked at. */
#define OOB_UNICODE 0xDEADBEEF
#define CHR_SVLEN(sv) (UTF ? sv_len_utf8(sv) : SvCUR(sv))
#define CHR_DIST(a,b) (UTF ? utf8_distance(a,b) : a - b)
/* length of regex to show in messages that don't mark a position within */
#define RegexLengthToShowInErrorMessages 127
/*
* If MARKER[12] are adjusted, be sure to adjust the constants at the top
* of t/op/regmesg.t, the tests in t/op/re_tests, and those in
* op/pragma/warn/regcomp.
*/
#define MARKER1 "<-- HERE" /* marker as it appears in the description */
#define MARKER2 " <-- HERE " /* marker as it appears within the regex */
#define REPORT_LOCATION " in regex; marked by " MARKER1 \
" in m/%"UTF8f MARKER2 "%"UTF8f"/"
#define REPORT_LOCATION_ARGS(offset) \
UTF8fARG(UTF, offset, RExC_precomp), \
UTF8fARG(UTF, RExC_end - RExC_precomp - offset, RExC_precomp + offset)
/* Used to point after bad bytes for an error message, but avoid skipping
* past a nul byte. */
#define SKIP_IF_CHAR(s) (!*(s) ? 0 : UTF ? UTF8SKIP(s) : 1)
/*
* Calls SAVEDESTRUCTOR_X if needed, then calls Perl_croak with the given
* arg. Show regex, up to a maximum length. If it's too long, chop and add
* "...".
*/
#define _FAIL(code) STMT_START { \
const char *ellipses = ""; \
IV len = RExC_end - RExC_precomp; \
\
if (!SIZE_ONLY) \
SAVEFREESV(RExC_rx_sv); \
if (len > RegexLengthToShowInErrorMessages) { \
/* chop 10 shorter than the max, to ensure meaning of "..." */ \
len = RegexLengthToShowInErrorMessages - 10; \
ellipses = "..."; \
} \
code; \
} STMT_END
#define FAIL(msg) _FAIL( \
Perl_croak(aTHX_ "%s in regex m/%"UTF8f"%s/", \
msg, UTF8fARG(UTF, len, RExC_precomp), ellipses))
#define FAIL2(msg,arg) _FAIL( \
Perl_croak(aTHX_ msg " in regex m/%"UTF8f"%s/", \
arg, UTF8fARG(UTF, len, RExC_precomp), ellipses))
/*
* Simple_vFAIL -- like FAIL, but marks the current location in the scan
*/
#define Simple_vFAIL(m) STMT_START { \
const IV offset = \
(RExC_parse > RExC_end ? RExC_end : RExC_parse) - RExC_precomp; \
Perl_croak(aTHX_ "%s" REPORT_LOCATION, \
m, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
/*
* Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL()
*/
#define vFAIL(m) STMT_START { \
if (!SIZE_ONLY) \
SAVEFREESV(RExC_rx_sv); \
Simple_vFAIL(m); \
} STMT_END
/*
* Like Simple_vFAIL(), but accepts two arguments.
*/
#define Simple_vFAIL2(m,a1) STMT_START { \
const IV offset = RExC_parse - RExC_precomp; \
S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
/*
* Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL2().
*/
#define vFAIL2(m,a1) STMT_START { \
if (!SIZE_ONLY) \
SAVEFREESV(RExC_rx_sv); \
Simple_vFAIL2(m, a1); \
} STMT_END
/*
* Like Simple_vFAIL(), but accepts three arguments.
*/
#define Simple_vFAIL3(m, a1, a2) STMT_START { \
const IV offset = RExC_parse - RExC_precomp; \
S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, a2, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
/*
* Calls SAVEDESTRUCTOR_X if needed, then Simple_vFAIL3().
*/
#define vFAIL3(m,a1,a2) STMT_START { \
if (!SIZE_ONLY) \
SAVEFREESV(RExC_rx_sv); \
Simple_vFAIL3(m, a1, a2); \
} STMT_END
/*
* Like Simple_vFAIL(), but accepts four arguments.
*/
#define Simple_vFAIL4(m, a1, a2, a3) STMT_START { \
const IV offset = RExC_parse - RExC_precomp; \
S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, a2, a3, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define vFAIL4(m,a1,a2,a3) STMT_START { \
if (!SIZE_ONLY) \
SAVEFREESV(RExC_rx_sv); \
Simple_vFAIL4(m, a1, a2, a3); \
} STMT_END
/* A specialized version of vFAIL2 that works with UTF8f */
#define vFAIL2utf8f(m, a1) STMT_START { \
const IV offset = RExC_parse - RExC_precomp; \
if (!SIZE_ONLY) \
SAVEFREESV(RExC_rx_sv); \
S_re_croak2(aTHX_ UTF, m, REPORT_LOCATION, a1, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
/* These have asserts in them because of [perl #122671] Many warnings in
* regcomp.c can occur twice. If they get output in pass1 and later in that
* pass, the pattern has to be converted to UTF-8 and the pass restarted, they
* would get output again. So they should be output in pass2, and these
* asserts make sure new warnings follow that paradigm. */
/* m is not necessarily a "literal string", in this macro */
#define reg_warn_non_literal_string(loc, m) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s" REPORT_LOCATION, \
m, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define ckWARNreg(loc,m) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define vWARN(loc, m) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define vWARN_dep(loc, m) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_warner(aTHX_ packWARN(WARN_DEPRECATED), m REPORT_LOCATION, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define ckWARNdep(loc,m) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED), \
m REPORT_LOCATION, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define ckWARNregdep(loc,m) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_REGEXP), \
m REPORT_LOCATION, \
REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define ckWARN2reg_d(loc,m, a1) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_ck_warner_d(aTHX_ packWARN(WARN_REGEXP), \
m REPORT_LOCATION, \
a1, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define ckWARN2reg(loc, m, a1) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
a1, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define vWARN3(loc, m, a1, a2) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
a1, a2, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define ckWARN3reg(loc, m, a1, a2) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
a1, a2, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define vWARN4(loc, m, a1, a2, a3) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
a1, a2, a3, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define ckWARN4reg(loc, m, a1, a2, a3) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_ck_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
a1, a2, a3, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
#define vWARN5(loc, m, a1, a2, a3, a4) STMT_START { \
const IV offset = loc - RExC_precomp; \
__ASSERT_(PASS2) Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION, \
a1, a2, a3, a4, REPORT_LOCATION_ARGS(offset)); \
} STMT_END
/* Macros for recording node offsets. 20001227 mjd@plover.com
* Nodes are numbered 1, 2, 3, 4. Node #n's position is recorded in
* element 2*n-1 of the array. Element #2n holds the byte length node #n.
* Element 0 holds the number n.
* Position is 1 indexed.
*/
#ifndef RE_TRACK_PATTERN_OFFSETS
#define Set_Node_Offset_To_R(node,byte)
#define Set_Node_Offset(node,byte)
#define Set_Cur_Node_Offset
#define Set_Node_Length_To_R(node,len)
#define Set_Node_Length(node,len)
#define Set_Node_Cur_Length(node,start)
#define Node_Offset(n)
#define Node_Length(n)
#define Set_Node_Offset_Length(node,offset,len)
#define ProgLen(ri) ri->u.proglen
#define SetProgLen(ri,x) ri->u.proglen = x
#else
#define ProgLen(ri) ri->u.offsets[0]
#define SetProgLen(ri,x) ri->u.offsets[0] = x
#define Set_Node_Offset_To_R(node,byte) STMT_START { \
if (! SIZE_ONLY) { \
MJD_OFFSET_DEBUG(("** (%d) offset of node %d is %d.\n", \
__LINE__, (int)(node), (int)(byte))); \
if((node) < 0) { \
Perl_croak(aTHX_ "value of node is %d in Offset macro", \
(int)(node)); \
} else { \
RExC_offsets[2*(node)-1] = (byte); \
} \
} \
} STMT_END
#define Set_Node_Offset(node,byte) \
Set_Node_Offset_To_R((node)-RExC_emit_start, (byte)-RExC_start)
#define Set_Cur_Node_Offset Set_Node_Offset(RExC_emit, RExC_parse)
#define Set_Node_Length_To_R(node,len) STMT_START { \
if (! SIZE_ONLY) { \
MJD_OFFSET_DEBUG(("** (%d) size of node %d is %d.\n", \
__LINE__, (int)(node), (int)(len))); \
if((node) < 0) { \
Perl_croak(aTHX_ "value of node is %d in Length macro", \
(int)(node)); \
} else { \
RExC_offsets[2*(node)] = (len); \
} \
} \
} STMT_END
#define Set_Node_Length(node,len) \
Set_Node_Length_To_R((node)-RExC_emit_start, len)
#define Set_Node_Cur_Length(node, start) \
Set_Node_Length(node, RExC_parse - start)
/* Get offsets and lengths */
#define Node_Offset(n) (RExC_offsets[2*((n)-RExC_emit_start)-1])
#define Node_Length(n) (RExC_offsets[2*((n)-RExC_emit_start)])
#define Set_Node_Offset_Length(node,offset,len) STMT_START { \
Set_Node_Offset_To_R((node)-RExC_emit_start, (offset)); \
Set_Node_Length_To_R((node)-RExC_emit_start, (len)); \
} STMT_END
#endif
#if PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS
#define EXPERIMENTAL_INPLACESCAN
#endif /*PERL_ENABLE_EXPERIMENTAL_REGEX_OPTIMISATIONS*/
#define DEBUG_RExC_seen() \
DEBUG_OPTIMISE_MORE_r({ \
PerlIO_printf(Perl_debug_log,"RExC_seen: "); \
\
if (RExC_seen & REG_ZERO_LEN_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_ZERO_LEN_SEEN "); \
\
if (RExC_seen & REG_LOOKBEHIND_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_LOOKBEHIND_SEEN "); \
\
if (RExC_seen & REG_GPOS_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_GPOS_SEEN "); \
\
if (RExC_seen & REG_RECURSE_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_RECURSE_SEEN "); \
\
if (RExC_seen & REG_TOP_LEVEL_BRANCHES_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_TOP_LEVEL_BRANCHES_SEEN "); \
\
if (RExC_seen & REG_VERBARG_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_VERBARG_SEEN "); \
\
if (RExC_seen & REG_CUTGROUP_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_CUTGROUP_SEEN "); \
\
if (RExC_seen & REG_RUN_ON_COMMENT_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_RUN_ON_COMMENT_SEEN "); \
\
if (RExC_seen & REG_UNFOLDED_MULTI_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_UNFOLDED_MULTI_SEEN "); \
\
if (RExC_seen & REG_GOSTART_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_GOSTART_SEEN "); \
\
if (RExC_seen & REG_UNBOUNDED_QUANTIFIER_SEEN) \
PerlIO_printf(Perl_debug_log,"REG_UNBOUNDED_QUANTIFIER_SEEN "); \
\
PerlIO_printf(Perl_debug_log,"\n"); \
});
#define DEBUG_SHOW_STUDY_FLAG(flags,flag) \
if ((flags) & flag) PerlIO_printf(Perl_debug_log, "%s ", #flag)
#define DEBUG_SHOW_STUDY_FLAGS(flags,open_str,close_str) \
if ( ( flags ) ) { \
PerlIO_printf(Perl_debug_log, "%s", open_str); \
DEBUG_SHOW_STUDY_FLAG(flags,SF_FL_BEFORE_SEOL); \
DEBUG_SHOW_STUDY_FLAG(flags,SF_FL_BEFORE_MEOL); \
DEBUG_SHOW_STUDY_FLAG(flags,SF_IS_INF); \
DEBUG_SHOW_STUDY_FLAG(flags,SF_HAS_PAR); \
DEBUG_SHOW_STUDY_FLAG(flags,SF_IN_PAR); \
DEBUG_SHOW_STUDY_FLAG(flags,SF_HAS_EVAL); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_DO_SUBSTR); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_DO_STCLASS_AND); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_DO_STCLASS_OR); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_DO_STCLASS); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_WHILEM_VISITED_POS); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_TRIE_RESTUDY); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_SEEN_ACCEPT); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_TRIE_DOING_RESTUDY); \
DEBUG_SHOW_STUDY_FLAG(flags,SCF_IN_DEFINE); \
PerlIO_printf(Perl_debug_log, "%s", close_str); \
}
#define DEBUG_STUDYDATA(str,data,depth) \
DEBUG_OPTIMISE_MORE_r(if(data){ \
PerlIO_printf(Perl_debug_log, \
"%*s" str "Pos:%"IVdf"/%"IVdf \
" Flags: 0x%"UVXf, \
(int)(depth)*2, "", \
(IV)((data)->pos_min), \
(IV)((data)->pos_delta), \
(UV)((data)->flags) \
); \
DEBUG_SHOW_STUDY_FLAGS((data)->flags," [ ","]"); \
PerlIO_printf(Perl_debug_log, \
" Whilem_c: %"IVdf" Lcp: %"IVdf" %s", \
(IV)((data)->whilem_c), \
(IV)((data)->last_closep ? *((data)->last_closep) : -1), \
is_inf ? "INF " : "" \
); \
if ((data)->last_found) \
PerlIO_printf(Perl_debug_log, \
"Last:'%s' %"IVdf":%"IVdf"/%"IVdf" %sFixed:'%s' @ %"IVdf \
" %sFloat: '%s' @ %"IVdf"/%"IVdf"", \
SvPVX_const((data)->last_found), \
(IV)((data)->last_end), \
(IV)((data)->last_start_min), \
(IV)((data)->last_start_max), \
((data)->longest && \
(data)->longest==&((data)->longest_fixed)) ? "*" : "", \
SvPVX_const((data)->longest_fixed), \
(IV)((data)->offset_fixed), \
((data)->longest && \
(data)->longest==&((data)->longest_float)) ? "*" : "", \
SvPVX_const((data)->longest_float), \
(IV)((data)->offset_float_min), \
(IV)((data)->offset_float_max) \
); \
PerlIO_printf(Perl_debug_log,"\n"); \
});
/* is c a control character for which we have a mnemonic? */
#define isMNEMONIC_CNTRL(c) _IS_MNEMONIC_CNTRL_ONLY_FOR_USE_BY_REGCOMP_DOT_C(c)
STATIC const char *
S_cntrl_to_mnemonic(const U8 c)
{
/* Returns the mnemonic string that represents character 'c', if one
* exists; NULL otherwise. The only ones that exist for the purposes of
* this routine are a few control characters */
switch (c) {
case '\a': return "\\a";
case '\b': return "\\b";
case ESC_NATIVE: return "\\e";
case '\f': return "\\f";
case '\n': return "\\n";
case '\r': return "\\r";
case '\t': return "\\t";
}
return NULL;
}
/* Mark that we cannot extend a found fixed substring at this point.
Update the longest found anchored substring and the longest found
floating substrings if needed. */
STATIC void
S_scan_commit(pTHX_ const RExC_state_t *pRExC_state, scan_data_t *data,
SSize_t *minlenp, int is_inf)
{
const STRLEN l = CHR_SVLEN(data->last_found);
const STRLEN old_l = CHR_SVLEN(*data->longest);
GET_RE_DEBUG_FLAGS_DECL;
PERL_ARGS_ASSERT_SCAN_COMMIT;
if ((l >= old_l) && ((l > old_l) || (data->flags & SF_BEFORE_EOL))) {
SvSetMagicSV(*data->longest, data->last_found);
if (*data->longest == data->longest_fixed) {
data->offset_fixed = l ? data->last_start_min : data->pos_min;
if (data->flags & SF_BEFORE_EOL)
data->flags
|= ((data->flags & SF_BEFORE_EOL) << SF_FIX_SHIFT_EOL);
else
data->flags &= ~SF_FIX_BEFORE_EOL;
data->minlen_fixed=minlenp;
data->lookbehind_fixed=0;
}
else { /* *data->longest == data->longest_float */
data->offset_float_min = l ? data->last_start_min : data->pos_min;
data->offset_float_max = (l
? data->last_start_max
: (data->pos_delta > SSize_t_MAX - data->pos_min
? SSize_t_MAX
: data->pos_min + data->pos_delta));
if (is_inf
|| (STRLEN)data->offset_float_max > (STRLEN)SSize_t_MAX)
data->offset_float_max = SSize_t_MAX;
if (data->flags & SF_BEFORE_EOL)
data->flags
|= ((data->flags & SF_BEFORE_EOL) << SF_FL_SHIFT_EOL);
else
data->flags &= ~SF_FL_BEFORE_EOL;
data->minlen_float=minlenp;
data->lookbehind_float=0;
}
}
SvCUR_set(data->last_found, 0);
{
SV * const sv = data->last_found;
if (SvUTF8(sv) && SvMAGICAL(sv)) {
MAGIC * const mg = mg_find(sv, PERL_MAGIC_utf8);
if (mg)
mg->mg_len = 0;
}
}
data->last_end = -1;
data->flags &= ~SF_BEFORE_EOL;
DEBUG_STUDYDATA("commit: ",data,0);
}
/* An SSC is just a regnode_charclass_posix with an extra field: the inversion
* list that describes which code points it matches */
STATIC void
S_ssc_anything(pTHX_ regnode_ssc *ssc)
{
/* Set the SSC 'ssc' to match an empty string or any code point */
PERL_ARGS_ASSERT_SSC_ANYTHING;
assert(is_ANYOF_SYNTHETIC(ssc));
ssc->invlist = sv_2mortal(_new_invlist(2)); /* mortalize so won't leak */
_append_range_to_invlist(ssc->invlist, 0, UV_MAX);
ANYOF_FLAGS(ssc) |= SSC_MATCHES_EMPTY_STRING; /* Plus matches empty */
}
STATIC int