#define STATIC static
#endif
+#ifndef MIN
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
struct RExC_state_t {
U32 flags; /* RXf_* are we folding, multilining? */
const char *lastparse;
I32 lastnum;
AV *paren_name_list; /* idx -> name */
+ U32 study_chunk_recursed_count;
#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)
#endif
};
* Simple_vFAIL -- like FAIL, but marks the current location in the scan
*/
#define Simple_vFAIL(m) STMT_START { \
- const IV offset = RExC_parse - RExC_precomp; \
+ 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
ANYOF_FLAGS(ssc) &= ~ANYOF_LOCALE_FLAGS;
}
+#define NON_OTHER_COUNT NON_OTHER_COUNT_FOR_USE_ONLY_BY_REGCOMP_DOT_C
+
+STATIC bool
+S_is_ssc_worth_it(const RExC_state_t * pRExC_state, const regnode_ssc * ssc)
+{
+ /* The synthetic start class is used to hopefully quickly winnow down
+ * places where a pattern could start a match in the target string. If it
+ * doesn't really narrow things down that much, there isn't much point to
+ * having the overhead of using it. This function uses some very crude
+ * heuristics to decide if to use the ssc or not.
+ *
+ * It returns TRUE if 'ssc' rules out more than half what it considers to
+ * be the "likely" possible matches, but of course it doesn't know what the
+ * actual things being matched are going to be; these are only guesses
+ *
+ * For /l matches, it assumes that the only likely matches are going to be
+ * in the 0-255 range, uniformly distributed, so half of that is 127
+ * For /a and /d matches, it assumes that the likely matches will be just
+ * the ASCII range, so half of that is 63
+ * For /u and there isn't anything matching above the Latin1 range, it
+ * assumes that that is the only range likely to be matched, and uses
+ * half that as the cut-off: 127. If anything matches above Latin1,
+ * it assumes that all of Unicode could match (uniformly), except for
+ * non-Unicode code points and things in the General Category "Other"
+ * (unassigned, private use, surrogates, controls and formats). This
+ * is a much large number. */
+
+ const U32 max_match = (LOC)
+ ? 127
+ : (! UNI_SEMANTICS)
+ ? 63
+ : (invlist_highest(ssc->invlist) < 256)
+ ? 127
+ : ((NON_OTHER_COUNT + 1) / 2) - 1;
+ U32 count = 0; /* Running total of number of code points matched by
+ 'ssc' */
+ UV start, end; /* Start and end points of current range in inversion
+ list */
+
+ PERL_ARGS_ASSERT_IS_SSC_WORTH_IT;
+
+ invlist_iterinit(ssc->invlist);
+ while (invlist_iternext(ssc->invlist, &start, &end)) {
+
+ /* /u is the only thing that we expect to match above 255; so if not /u
+ * and even if there are matches above 255, ignore them. This catches
+ * things like \d under /d which does match the digits above 255, but
+ * since the pattern is /d, it is not likely to be expecting them */
+ if (! UNI_SEMANTICS) {
+ if (start > 255) {
+ break;
+ }
+ end = MIN(end, 255);
+ }
+ count += end - start + 1;
+ if (count > max_match) {
+ invlist_iterfinish(ssc->invlist);
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+
STATIC void
S_ssc_finalize(pTHX_ RExC_state_t *pRExC_state, regnode_ssc *ssc)
{
fake_study_recurse:
+ DEBUG_r(
+ RExC_study_chunk_recursed_count++;
+ );
while ( scan && OP(scan) != END && scan < last ){
UV min_subtract = 0; /* How mmany chars to subtract from the minimum
node length to get a real minimum (because
DEBUG_OPTIMISE_MORE_r(
{
PerlIO_printf(Perl_debug_log,
- "%*sstudy_chunk stopparen=%ld depth=%lu recursed_depth=%lu ",
+ "%*sstudy_chunk stopparen=%ld recursed_count=%lu depth=%lu recursed_depth=%lu ",
((int) depth*2), "", (long)stopparen,
+ (unsigned long)RExC_study_chunk_recursed_count,
(unsigned long)depth, (unsigned long)recursed_depth);
if (recursed_depth) {
U32 i;
regnode *end;
U32 my_recursed_depth= recursed_depth;
- if (OP(scan) != SUSPEND) {
+ if (OP(scan) != SUSPEND) { /* GOSUB/GOSTART */
/* set the pointer */
if (OP(scan) == GOSUB) {
paren = ARG(scan);
start = RExC_rxi->program + 1;
end = RExC_opend;
}
- if (!recursed_depth
+ /* this code is intended to handle expanding regex "subs" so
+ * we can apply various optimizations. For instance with
+ * /(?(DEFINE)(?<foo>foo)(?<bar>bar))(?&foo)(?&bar)/ we
+ * want to recognize that the mandatory substr is going to be
+ * "foobar".
+ * However if we are not in SCF_DO_SUBSTR mode then there is
+ * no point in doing this, and it can cause a serious slowdown.
+ * See RT #122283.
+ * Note also that this was a workaround for the core problem
+ * which was that during compilation logic the excessive
+ * recursion resulted in slowly consuming all the memory on
+ * the box. Exactly what causes this is unclear. It does not
+ * appear to be directly related to allocating the "visited"
+ * bitmaps that is RExC_study_chunk_recursed.
+ *
+ * In reality study_chunk() does far far too much, and probably
+ * this an other issues would go away if we split it into
+ * multiple components.
+ *
+ * - Yves
+ * */
+ if (flags & SCF_DO_SUBSTR) {
+ if (
+ !recursed_depth
||
!PAREN_TEST(RExC_study_chunk_recursed + ((recursed_depth-1) * RExC_study_chunk_recursed_bytes), paren)
) {
+ /* it is quite possible that there are more efficient ways
+ * to do this. We maintain a bitmap per level of recursion
+ * of which patterns we have entered so we can detect if a
+ * pattern creates a possible infinite loop. When we
+ * recurse down a level we copy the previous levels bitmap
+ * down. When we are at recursion level 0 we zero the top
+ * level bitmap. It would be nice to implement a different
+ * more efficient way of doing this. In particular the top
+ * level bitmap may be unnecessary.
+ */
if (!recursed_depth) {
Zero(RExC_study_chunk_recursed, RExC_study_chunk_recursed_bytes, U8);
} else {
ssc_anything(data->start_class);
flags &= ~SCF_DO_STCLASS;
}
+ }
} else {
Newx(newframe,1,scan_frame);
paren = stopparen;
reStudy:
r->minlen = minlen = sawlookahead = sawplus = sawopen = sawminmod = 0;
+ DEBUG_r(
+ RExC_study_chunk_recursed_count= 0;
+ );
Zero(r->substrs, 1, struct reg_substr_data);
if (RExC_study_chunk_recursed)
Zero(RExC_study_chunk_recursed,
else if (PL_regkind[OP(first)] == BOL) {
r->intflags |= (OP(first) == MBOL
? PREGf_ANCH_MBOL
- : (OP(first) == SBOL
- ? PREGf_ANCH_SBOL
- : PREGf_ANCH_BOL));
+ : PREGf_ANCH_SBOL);
first = NEXTOPER(first);
goto again;
}
if ((!(r->anchored_substr || r->anchored_utf8) || r->anchored_offset)
&& stclass_flag
&& ! (ANYOF_FLAGS(data.start_class) & SSC_MATCHES_EMPTY_STRING)
- && !ssc_is_anything(data.start_class))
+ && is_ssc_worth_it(pRExC_state, data.start_class))
{
const U32 n = add_data(pRExC_state, STR_WITH_LEN("f"));
= r->float_substr = r->float_utf8 = NULL;
if (! (ANYOF_FLAGS(data.start_class) & SSC_MATCHES_EMPTY_STRING)
- && ! ssc_is_anything(data.start_class))
+ && is_ssc_worth_it(pRExC_state, data.start_class))
{
const U32 n = add_data(pRExC_state, STR_WITH_LEN("f"));
if (PL_regkind[fop] == NOTHING && nop == END)
r->extflags |= RXf_NULL;
- else if (PL_regkind[fop] == BOL && nop == END)
+ else if ((fop == MBOL || (fop == SBOL && !first->flags)) && nop == END)
+ /* when fop is SBOL first->flags will be true only when it was
+ * produced by parsing /\A/, and not when parsing /^/. This is
+ * very important for the split code as there we want to
+ * treat /^/ as /^/m, but we do not want to treat /\A/ as /^/m.
+ * See rt #122761 for more details. -- Yves */
r->extflags |= RXf_START_ONLY;
else if (fop == PLUS
&& PL_regkind[nop] == POSIXD && FLAGS(next) == _CC_SPACE
}
Newxz(r->offs, RExC_npar, regexp_paren_pair);
/* assume we don't need to swap parens around before we match */
-
+ DEBUG_TEST_r({
+ PerlIO_printf(Perl_debug_log,"study_chunk_recursed_count: %lu\n",
+ (unsigned long)RExC_study_chunk_recursed_count);
+ });
DEBUG_DUMP_r({
DEBUG_RExC_seen();
PerlIO_printf(Perl_debug_log,"Final program:\n");
regex_charset cs;
bool has_use_defaults = FALSE;
const char* const seqstart = RExC_parse - 1; /* Point to the '?' */
+ int x_mod_count = 0;
PERL_ARGS_ASSERT_PARSE_LPAREN_QUESTION_FLAGS;
switch (*RExC_parse) {
/* Code for the imsx flags */
- CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp);
+ CASE_STD_PMMOD_FLAGS_PARSE_SET(flagsp, x_mod_count);
case LOCALE_PAT_MOD:
if (has_charset_modifier) {
if (RExC_flags & RXf_PMf_FOLD) {
RExC_contains_i = 1;
}
+ if (PASS2) {
+ STD_PMMOD_FLAGS_PARSE_X_WARN(x_mod_count);
+ }
return;
/*NOTREACHED*/
default:
++RExC_parse;
}
+
+ if (PASS2) {
+ STD_PMMOD_FLAGS_PARSE_X_WARN(x_mod_count);
+ }
}
/*
num = RExC_npar + num - 1;
}
- ret = reganode(pRExC_state, GOSUB, num);
+ ret = reg2Lanode(pRExC_state, GOSUB, num, RExC_recurse_count);
if (!SIZE_ONLY) {
if (num > (I32)RExC_rx->nparens) {
RExC_parse++;
vFAIL("Reference to nonexistent group");
}
- ARG2L_SET( ret, RExC_recurse_count++);
- RExC_emit++;
+ RExC_recurse_count++;
DEBUG_OPTIMISE_MORE_r(PerlIO_printf(Perl_debug_log,
"Recurse #%"UVuf" to %"IVdf"\n",
(UV)ARG(ret), (IV)ARG2L(ret)));
- } else {
- RExC_size++;
- }
- RExC_seen |= REG_RECURSE_SEEN;
+ }
+ RExC_seen |= REG_RECURSE_SEEN;
Set_Node_Length(ret, 1 + regarglen[OP(ret)]); /* MJD */
Set_Node_Offset(ret, parse_start); /* MJD */
if (is_logical) {
regnode *eval;
ret = reg_node(pRExC_state, LOGICAL);
- eval = reganode(pRExC_state, EVAL, n);
+
+ eval = reg2Lanode(pRExC_state, EVAL,
+ n,
+
+ /* for later propagation into (??{})
+ * return value */
+ RExC_flags & RXf_PMf_COMPILETIME
+ );
if (!SIZE_ONLY) {
ret->flags = 2;
- /* for later propagation into (??{}) return value */
- eval->flags = (U8) (RExC_flags & RXf_PMf_COMPILETIME);
}
REGTAIL(pRExC_state, ret, eval);
/* deal with the length of this later - MJD */
return ret;
}
- ret = reganode(pRExC_state, EVAL, n);
+ ret = reg2Lanode(pRExC_state, EVAL, n, 0);
Set_Node_Length(ret, RExC_parse - parse_start + 1);
Set_Node_Offset(ret, parse_start);
return ret;
case '(': /* (?(?{...})...) and (?(?=...)...) */
{
int is_define= 0;
+ const int DEFINE_len = sizeof("DEFINE") - 1;
if (RExC_parse[0] == '?') { /* (?(?...)) */
if (RExC_parse[1] == '=' || RExC_parse[1] == '!'
|| RExC_parse[1] == '<'
ret = reganode(pRExC_state,NGROUPP,num);
goto insert_if_check_paren;
}
- else if (RExC_parse[0] == 'D' &&
- RExC_parse[1] == 'E' &&
- RExC_parse[2] == 'F' &&
- RExC_parse[3] == 'I' &&
- RExC_parse[4] == 'N' &&
- RExC_parse[5] == 'E')
- {
+ else if (strnEQ(RExC_parse, "DEFINE",
+ MIN(DEFINE_len, RExC_end - RExC_parse)))
+ {
ret = reganode(pRExC_state,DEFINEP,0);
- RExC_parse +=6 ;
+ RExC_parse += DEFINE_len;
is_define = 1;
goto insert_if_check_paren;
}
}
else
lastbr = NULL;
- if (c != ')')
- vFAIL("Switch (?(condition)... contains too many branches");
+ if (c != ')') {
+ if (RExC_parse>RExC_end)
+ vFAIL("Switch (?(condition)... not terminated");
+ else
+ vFAIL("Switch (?(condition)... contains too many branches");
+ }
ender = reg_node(pRExC_state, TAIL);
REGTAIL(pRExC_state, br, ender);
if (lastbr) {
nextchar(pRExC_state);
if (RExC_flags & RXf_PMf_MULTILINE)
ret = reg_node(pRExC_state, MBOL);
- else if (RExC_flags & RXf_PMf_SINGLELINE)
- ret = reg_node(pRExC_state, SBOL);
else
- ret = reg_node(pRExC_state, BOL);
+ ret = reg_node(pRExC_state, SBOL);
Set_Node_Length(ret, 1); /* MJD */
break;
case '$':
RExC_seen_zerolen++;
if (RExC_flags & RXf_PMf_MULTILINE)
ret = reg_node(pRExC_state, MEOL);
- else if (RExC_flags & RXf_PMf_SINGLELINE)
- ret = reg_node(pRExC_state, SEOL);
else
- ret = reg_node(pRExC_state, EOL);
+ ret = reg_node(pRExC_state, SEOL);
Set_Node_Length(ret, 1); /* MJD */
break;
case '.':
case 'A':
RExC_seen_zerolen++;
ret = reg_node(pRExC_state, SBOL);
+ /* SBOL is shared with /^/ so we set the flags so we can tell
+ * /\A/ from /^/ in split. We check ret because first pass we
+ * have no regop struct to set the flags on. */
+ if (PASS2)
+ ret->flags = 1;
*flagp |= SIMPLE;
goto finish_meta_pat;
case 'G':
* element is an array that contains all the strings known so far that are
* the same length. And that length (in number of code points) is the same
* as the index of the top-level array. Hence, the [2] element is an
- * array, each element thereof is a string containing TWO code points; while element
- * [3] is for strings of THREE characters, and so on. Since this is for
- * multi-char strings there can never be a [0] nor [1] element.
+ * array, each element thereof is a string containing TWO code points;
+ * while element [3] is for strings of THREE characters, and so on. Since
+ * this is for multi-char strings there can never be a [0] nor [1] element.
*
* When we rewrite the character class below, we will do so such that the
* longest strings are written first, so that it prefers the longest
}
else {
/* Is a backslash; get the code point of the char after it */
- if (UTF && ! UTF8_IS_INVARIANT(RExC_parse)) {
+ if (UTF && ! UTF8_IS_INVARIANT(UCHARAT(RExC_parse))) {
value = utf8n_to_uvchr((U8*)RExC_parse,
RExC_end - RExC_parse,
&numlen, UTF8_ALLOW_DEFAULT);
continue; /* Back to top of loop to get next char */
}
/* Here, is a single code point, and <value> contains it */
+#ifdef EBCDIC
+ /* We consider named characters to be literal characters */
+ literal_endpoint++;
+#endif
}
break;
case 'p':
* included. literal_endpoint==2 means both ends of the range used
* a literal character, not \x{foo} */
if (literal_endpoint == 2
- && ((prevvalue >= 'a' && value <= 'z')
- || (prevvalue >= 'A' && value <= 'Z')))
+ && ((isLOWER_A(prevvalue) && isLOWER_A(value))
+ || (isUPPER_A(prevvalue) && isUPPER_A(value))))
{
_invlist_intersection(this_range, PL_XPosix_ptrs[_CC_ASCII],
&this_range);
- /* Since this above only contains ascii, the intersection of it
- * with anything will still yield only ascii */
+ /* Since 'this_range' now only contains ascii, the intersection
+ * of it with anything will still yield only ascii */
_invlist_intersection(this_range, PL_XPosix_ptrs[_CC_ALPHA],
&this_range);
}
_invlist_union(cp_foldable_list, this_range, &cp_foldable_list);
literal_endpoint = 0;
+ SvREFCNT_dec_NN(this_range);
#endif
}
}
}
-/*
-- reg_node - emit a node
-*/
-STATIC regnode * /* Location. */
-S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
+STATIC regnode *
+S_regnode_guts(pTHX_ RExC_state_t *pRExC_state, const U8 op, const STRLEN extra_size, const char* const name)
{
- regnode *ptr;
+ /* Allocate a regnode for 'op' and returns it, with 'extra_size' extra
+ * space. In pass1, it aligns and increments RExC_size; in pass2,
+ * RExC_emit */
+
regnode * const ret = RExC_emit;
GET_RE_DEBUG_FLAGS_DECL;
- PERL_ARGS_ASSERT_REG_NODE;
+ PERL_ARGS_ASSERT_REGNODE_GUTS;
+
+ assert(extra_size >= regarglen[op]);
if (SIZE_ONLY) {
SIZE_ALIGN(RExC_size);
- RExC_size += 1;
+ RExC_size += 1 + extra_size;
return(ret);
}
if (RExC_emit >= RExC_emit_bound)
op, (void*)RExC_emit, (void*)RExC_emit_bound);
NODE_ALIGN_FILL(ret);
- ptr = ret;
- FILL_ADVANCE_NODE(ptr, op);
-#ifdef RE_TRACK_PATTERN_OFFSETS
+#ifndef RE_TRACK_PATTERN_OFFSETS
+ PERL_UNUSED_ARG(name);
+#else
if (RExC_offsets) { /* MJD */
MJD_OFFSET_DEBUG(
("%s:%d: (op %s) %s %"UVuf" (len %"UVuf") (max %"UVuf").\n",
- "reg_node", __LINE__,
+ name, __LINE__,
PL_reg_name[op],
(UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0]
? "Overwriting end of array!\n" : "OK",
Set_Node_Offset(RExC_emit, RExC_parse + (op == END));
}
#endif
- RExC_emit = ptr;
+ return(ret);
+}
+
+/*
+- reg_node - emit a node
+*/
+STATIC regnode * /* Location. */
+S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
+{
+ regnode * const ret = regnode_guts(pRExC_state, op, regarglen[op], "reg_node");
+
+ PERL_ARGS_ASSERT_REG_NODE;
+
+ assert(regarglen[op] == 0);
+
+ if (PASS2) {
+ regnode *ptr = ret;
+ FILL_ADVANCE_NODE(ptr, op);
+ RExC_emit = ptr;
+ }
return(ret);
}
STATIC regnode * /* Location. */
S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
{
- regnode *ptr;
- regnode * const ret = RExC_emit;
- GET_RE_DEBUG_FLAGS_DECL;
+ regnode * const ret = regnode_guts(pRExC_state, op, regarglen[op], "reganode");
PERL_ARGS_ASSERT_REGANODE;
- if (SIZE_ONLY) {
- SIZE_ALIGN(RExC_size);
- RExC_size += 2;
- /*
- We can't do this:
+ assert(regarglen[op] == 1);
+
+ if (PASS2) {
+ regnode *ptr = ret;
+ FILL_ADVANCE_NODE_ARG(ptr, op, arg);
+ RExC_emit = ptr;
+ }
+ return(ret);
+}
- assert(2==regarglen[op]+1);
+STATIC regnode *
+S_reg2Lanode(pTHX_ RExC_state_t *pRExC_state, const U8 op, const U32 arg1, const I32 arg2)
+{
+ /* emit a node with U32 and I32 arguments */
- Anything larger than this has to allocate the extra amount.
- If we changed this to be:
+ regnode * const ret = regnode_guts(pRExC_state, op, regarglen[op], "reg2Lanode");
- RExC_size += (1 + regarglen[op]);
+ PERL_ARGS_ASSERT_REG2LANODE;
- then it wouldn't matter. Its not clear what side effect
- might come from that so its not done so far.
- -- dmq
- */
- return(ret);
- }
- if (RExC_emit >= RExC_emit_bound)
- Perl_croak(aTHX_ "panic: reg_node overrun trying to emit %d, %p>=%p",
- op, (void*)RExC_emit, (void*)RExC_emit_bound);
+ assert(regarglen[op] == 2);
- NODE_ALIGN_FILL(ret);
- ptr = ret;
- FILL_ADVANCE_NODE_ARG(ptr, op, arg);
-#ifdef RE_TRACK_PATTERN_OFFSETS
- if (RExC_offsets) { /* MJD */
- MJD_OFFSET_DEBUG(
- ("%s(%d): (op %s) %s %"UVuf" <- %"UVuf" (max %"UVuf").\n",
- "reganode",
- __LINE__,
- PL_reg_name[op],
- (UV)(RExC_emit - RExC_emit_start) > RExC_offsets[0] ?
- "Overwriting end of array!\n" : "OK",
- (UV)(RExC_emit - RExC_emit_start),
- (UV)(RExC_parse - RExC_start),
- (UV)RExC_offsets[0]));
- Set_Cur_Node_Offset;
+ if (PASS2) {
+ regnode *ptr = ret;
+ FILL_ADVANCE_NODE_2L_ARG(ptr, op, arg1, arg2);
+ RExC_emit = ptr;
}
-#endif
- RExC_emit = ptr;
return(ret);
}
}
if (r->intflags & PREGf_ANCH) {
PerlIO_printf(Perl_debug_log, "anchored");
- if (r->intflags & PREGf_ANCH_BOL)
- PerlIO_printf(Perl_debug_log, "(BOL)");
if (r->intflags & PREGf_ANCH_MBOL)
PerlIO_printf(Perl_debug_log, "(MBOL)");
if (r->intflags & PREGf_ANCH_SBOL)
}
else if (k == BRANCHJ && (OP(o) == UNLESSM || OP(o) == IFMATCH))
Perl_sv_catpvf(aTHX_ sv, "[%d]", -(o->flags));
+ else if (OP(o) == SBOL)
+ Perl_sv_catpvf(aTHX_ sv, " /%s/", o->flags ? "\\A" : "^");
#else
PERL_UNUSED_CONTEXT;
PERL_UNUSED_ARG(sv);
#define MAX_PRINT_A MAX_PRINT_A_FOR_USE_ONLY_BY_REGCOMP_DOT_C
-#ifndef MIN
-#define MIN(a,b) ((a) < (b) ? (a) : (b))
-#endif
-
STATIC void
S_put_range(pTHX_ SV *sv, UV start, const UV end, const bool allow_literals)
{
https://perl5.git.perl.org / perl5.git / blobdiff