I32 nestroot; /* root parens we are in - used by accept */
I32 extralen;
I32 seen_zerolen;
- I32 seen_evals;
regnode **open_parens; /* pointers to open parens */
regnode **close_parens; /* pointers to close parens */
regnode *opend; /* END node in program */
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;
#define RExC_nestroot (pRExC_state->nestroot)
#define RExC_extralen (pRExC_state->extralen)
#define RExC_seen_zerolen (pRExC_state->seen_zerolen)
-#define RExC_seen_evals (pRExC_state->seen_evals)
#define RExC_utf8 (pRExC_state->utf8)
#define RExC_uni_semantics (pRExC_state->uni_semantics)
#define RExC_orig_utf8 (pRExC_state->orig_utf8)
NULL, NULL, rx_flags, 0);
}
+/* see if there are any run-time code blocks in the pattern.
+ * False positives are allowed */
+
+static bool
+S_has_runtime_code(pTHX_ RExC_state_t * const pRExC_state, OP *expr,
+ U32 pm_flags, char *pat, STRLEN plen)
+{
+ int n = 0;
+ STRLEN s;
+
+ /* avoid infinitely recursing when we recompile the pattern parcelled up
+ * as qr'...'. A single constant qr// string can't have have any
+ * run-time component in it, and thus, no runtime code. (A non-qr
+ * string, however, can, e.g. $x =~ '(?{})') */
+ if ((pm_flags & PMf_IS_QR) && expr && expr->op_type == OP_CONST)
+ return 0;
+
+ for (s = 0; s < plen; s++) {
+ if (n < pRExC_state->num_code_blocks
+ && s == pRExC_state->code_blocks[n].start)
+ {
+ s = pRExC_state->code_blocks[n].end;
+ n++;
+ continue;
+ }
+ /* TODO ideally should handle [..], (#..), /#.../x to reduce false
+ * positives here */
+ if (pat[s] == '(' && pat[s+1] == '?' &&
+ (pat[s+2] == '{' || (pat[s+2] == '?' && pat[s+3] == '{'))
+ )
+ return 1;
+ }
+ return 0;
+}
+
+/* Handle run-time code blocks. We will already have compiled any direct
+ * or indirect literal code blocks. Now, take the pattern 'pat' and make a
+ * copy of it, but with any literal code blocks blanked out and
+ * appropriate chars escaped; then feed it into
+ *
+ * eval "qr'modified_pattern'"
+ *
+ * For example,
+ *
+ * a\bc(?{"this was literal"})def'ghi\\jkl(?{"this is runtime"})mno
+ *
+ * becomes
+ *
+ * qr'a\\bc def\'ghi\\\\jkl(?{"this is runtime"})mno'
+ *
+ * After eval_sv()-ing that, grab any new code blocks from the returned qr
+ * and merge them with any code blocks of the original regexp.
+ *
+ * If the pat is non-UTF8, while the evalled qr is UTF8, don't merge;
+ * instead, just save the qr and return FALSE; this tells our caller that
+ * the original pattern needs upgrading to utf8.
+ */
+
+bool
+S_compile_runtime_code(pTHX_ RExC_state_t * const pRExC_state,
+ char *pat, STRLEN plen)
+{
+ SV *qr;
+
+ GET_RE_DEBUG_FLAGS_DECL;
+
+ if (pRExC_state->runtime_code_qr) {
+ /* this is the second time we've been called; this should
+ * only happen if the main pattern got upgraded to utf8
+ * during compilation; re-use the qr we compiled first time
+ * round (which should be utf8 too)
+ */
+ qr = pRExC_state->runtime_code_qr;
+ pRExC_state->runtime_code_qr = NULL;
+ assert(RExC_utf8 && SvUTF8(qr));
+ }
+ else {
+ int n = 0;
+ STRLEN s;
+ char *p, *newpat;
+ int newlen = plen + 6; /* allow for "qr''x\0" extra chars */
+ SV *sv, *qr_ref;
+ dSP;
+
+ /* determine how many extra chars we need for ' and \ escaping */
+ for (s = 0; s < plen; s++) {
+ if (pat[s] == '\'' || pat[s] == '\\')
+ newlen++;
+ }
+
+ Newx(newpat, newlen, char);
+ p = newpat;
+ *p++ = 'q'; *p++ = 'r'; *p++ = '\'';
+
+ for (s = 0; s < plen; s++) {
+ if (n < pRExC_state->num_code_blocks
+ && s == pRExC_state->code_blocks[n].start)
+ {
+ /* blank out literal code block */
+ assert(pat[s] == '(');
+ while (s <= pRExC_state->code_blocks[n].end) {
+ *p++ = ' ';
+ s++;
+ }
+ s--;
+ n++;
+ continue;
+ }
+ if (pat[s] == '\'' || pat[s] == '\\')
+ *p++ = '\\';
+ *p++ = pat[s];
+ }
+ *p++ = '\'';
+ if (pRExC_state->pm_flags & RXf_PMf_EXTENDED)
+ *p++ = 'x';
+ *p++ = '\0';
+ DEBUG_COMPILE_r({
+ PerlIO_printf(Perl_debug_log,
+ "%sre-parsing pattern for runtime code:%s %s\n",
+ PL_colors[4],PL_colors[5],newpat);
+ });
+
+ sv = newSVpvn_flags(newpat, p-newpat-1, RExC_utf8 ? SVf_UTF8 : 0);
+ Safefree(newpat);
+
+ ENTER;
+ SAVETMPS;
+ save_re_context();
+ PUSHSTACKi(PERLSI_REQUIRE);
+ /* this causes the toker to collapse \\ into \ when parsing
+ * qr''; normally only q'' does this. It also alters hints
+ * handling */
+ PL_reg_state.re_reparsing = TRUE;
+ eval_sv(sv, G_SCALAR);
+ SvREFCNT_dec(sv);
+ SPAGAIN;
+ qr_ref = POPs;
+ PUTBACK;
+ if (SvTRUE(ERRSV))
+ Perl_croak(aTHX_ "%s", SvPVx_nolen_const(ERRSV));
+ assert(SvROK(qr_ref));
+ qr = SvRV(qr_ref);
+ assert(SvTYPE(qr) == SVt_REGEXP && RX_ENGINE((REGEXP*)qr)->op_comp);
+ /* the leaving below frees the tmp qr_ref.
+ * Give qr a life of its own */
+ SvREFCNT_inc(qr);
+ POPSTACK;
+ FREETMPS;
+ LEAVE;
+
+ }
+
+ if (!RExC_utf8 && SvUTF8(qr)) {
+ /* first time through; the pattern got upgraded; save the
+ * qr for the next time through */
+ assert(!pRExC_state->runtime_code_qr);
+ pRExC_state->runtime_code_qr = qr;
+ return 0;
+ }
+
+
+ /* extract any code blocks within the returned qr// */
+
+
+ /* merge the main (r1) and run-time (r2) code blocks into one */
+ {
+ RXi_GET_DECL(((struct regexp*)SvANY(qr)), r2);
+ struct reg_code_block *new_block, *dst;
+ RExC_state_t * const r1 = pRExC_state; /* convenient alias */
+ int i1 = 0, i2 = 0;
+
+ if (!r2->num_code_blocks) /* we guessed wrong */
+ return 1;
+
+ Newx(new_block,
+ r1->num_code_blocks + r2->num_code_blocks,
+ struct reg_code_block);
+ dst = new_block;
+
+ while ( i1 < r1->num_code_blocks
+ || i2 < r2->num_code_blocks)
+ {
+ struct reg_code_block *src;
+ bool is_qr = 0;
+
+ if (i1 == r1->num_code_blocks) {
+ src = &r2->code_blocks[i2++];
+ is_qr = 1;
+ }
+ else if (i2 == r2->num_code_blocks)
+ src = &r1->code_blocks[i1++];
+ else if ( r1->code_blocks[i1].start
+ < r2->code_blocks[i2].start)
+ {
+ src = &r1->code_blocks[i1++];
+ assert(src->end < r2->code_blocks[i2].start);
+ }
+ else {
+ assert( r1->code_blocks[i1].start
+ > r2->code_blocks[i2].start);
+ src = &r2->code_blocks[i2++];
+ is_qr = 1;
+ assert(src->end < r1->code_blocks[i1].start);
+ }
+
+ assert(pat[src->start] == '(');
+ assert(pat[src->end] == ')');
+ dst->start = src->start;
+ dst->end = src->end;
+ dst->block = src->block;
+ dst->src_regex = is_qr ? (REGEXP*) SvREFCNT_inc( (SV*) qr)
+ : src->src_regex;
+ dst++;
+ }
+ r1->num_code_blocks += r2->num_code_blocks;
+ Safefree(r1->code_blocks);
+ r1->code_blocks = new_block;
+ }
+
+ SvREFCNT_dec(qr);
+ return 1;
+}
+
/*
* Perl_re_op_compile - the perl internal RE engine's function to compile a
*
* orig_rx_flags contains RXf_* flags. See perlreapi.pod for more details.
*
- * pm_flags contains the PMf_* flags from the calling PMOP. Currently
- * we're only interested in PMf_HAS_CV and PMf_IS_QR.
+ * pm_flags contains the PMf_* flags, typically based on those from the
+ * pm_flags field of the related PMOP. Currently we're only interested in
+ * PMf_HAS_CV, PMf_IS_QR, PMf_USE_RE_EVAL.
*
* We can't allocate space until we know how big the compiled form will be,
* but we can't compile it (and thus know how big it is) until we've got a
REGEXP *
Perl_re_op_compile(pTHX_ SV ** const patternp, int pat_count,
OP *expr, const regexp_engine* eng, REGEXP *VOL old_re,
- int *is_bare_re, U32 orig_rx_flags, U32 pm_flags)
+ bool *is_bare_re, U32 orig_rx_flags, U32 pm_flags)
{
dVAR;
REGEXP *rx;
bool used_setjump = FALSE;
regex_charset initial_charset = get_regex_charset(orig_rx_flags);
bool code_is_utf8 = 0;
- bool recompile = 0;
+ bool VOL recompile = 0;
+ bool runtime_code = 0;
U8 jump_ret = 0;
dJMPENV;
scan_data_t data;
pRExC_state->num_code_blocks = 0;
if (is_bare_re)
- *is_bare_re = 0;
+ *is_bare_re = FALSE;
if (expr && (expr->op_type == OP_LIST ||
(expr->op_type == OP_NULL && expr->op_targ == OP_LIST))) {
OP *o = NULL;
int n = 0;
bool utf8 = 0;
+ STRLEN orig_patlen = 0;
if (pRExC_state->num_code_blocks) {
o = cLISTOPx(expr)->op_first;
o = o->op_sibling;;
}
+ if ((SvAMAGIC(pat) || SvAMAGIC(msv)) &&
+ (sv = amagic_call(pat, msv, concat_amg, AMGf_assign)))
+ {
+ sv_setsv(pat, sv);
+ /* overloading involved: all bets are off over literal
+ * code. Pretend we haven't seen it */
+ pRExC_state->num_code_blocks -= n;
+ n = 0;
+ rx = NULL;
+
+ }
+ else {
+ while (SvAMAGIC(msv)
+ && (sv = AMG_CALLunary(msv, string_amg))
+ && sv != msv)
+ {
+ msv = sv;
+ SvGETMAGIC(msv);
+ }
+ if (SvROK(msv) && SvTYPE(SvRV(msv)) == SVt_REGEXP)
+ msv = SvRV(msv);
+ orig_patlen = SvCUR(pat);
+ sv_catsv_nomg(pat, msv);
+ rx = msv;
+ if (code)
+ pRExC_state->code_blocks[n-1].end = SvCUR(pat)-1;
+ }
+
/* extract any code blocks within any embedded qr//'s */
- rx = msv;
- if (SvROK(rx))
- rx = SvRV(rx);
- if (SvTYPE(rx) == SVt_REGEXP
+ if (rx && SvTYPE(rx) == SVt_REGEXP
&& RX_ENGINE((REGEXP*)rx)->op_comp)
{
pRExC_state->num_code_blocks += ri->num_code_blocks;
for (i=0; i < ri->num_code_blocks; i++) {
struct reg_code_block *src, *dst;
- STRLEN offset = SvCUR(pat)
+ STRLEN offset = orig_patlen
+ ((struct regexp *)SvANY(rx))->pre_prefix;
assert(n < pRExC_state->num_code_blocks);
src = &ri->code_blocks[i];
}
}
}
-
- if ((SvAMAGIC(pat) || SvAMAGIC(msv)) &&
- (sv = amagic_call(pat, msv, concat_amg, AMGf_assign)))
- {
- sv_setsv(pat, sv);
- /* overloading involved: all bets are off over literal
- * code. Pretend we haven't seen it */
- pRExC_state->num_code_blocks -= n;
- n = 0;
-
- }
- else {
- sv_catsv_nomg(pat, msv);
- if (code)
- pRExC_state->code_blocks[n-1].end = SvCUR(pat)-1;
- }
}
SvSETMAGIC(pat);
}
- else
+ else {
+ SV *sv;
pat = *patternp;
+ while (SvAMAGIC(pat)
+ && (sv = AMG_CALLunary(pat, string_amg))
+ && sv != pat)
+ {
+ pat = sv;
+ SvGETMAGIC(pat);
+ }
+ }
/* handle bare regex: foo =~ $re */
{
re = SvRV(re);
if (SvTYPE(re) == SVt_REGEXP) {
if (is_bare_re)
- *is_bare_re = 1;
+ *is_bare_re = TRUE;
SvREFCNT_inc(re);
Safefree(pRExC_state->code_blocks);
return (REGEXP*)re;
RExC_utf8 = RExC_orig_utf8 = (plen == 0 || IN_BYTES) ? 0 : SvUTF8(pat);
RExC_uni_semantics = 0;
RExC_contains_locale = 0;
+ pRExC_state->runtime_code_qr = NULL;
/****************** LONG JUMP TARGET HERE***********************/
/* Longjmp back to here if have to switch in midstream to utf8 */
&& RX_PRELEN(old_re) == plen
&& memEQ(RX_PRECOMP(old_re), exp, plen))
{
- /* see if there are any run-time code blocks */
- int n = 0;
- STRLEN s;
- bool runtime = 0;
- for (s = 0; s < plen; s++) {
- if (n < pRExC_state->num_code_blocks
- && s == pRExC_state->code_blocks[n].start)
- {
- s = pRExC_state->code_blocks[n].end;
- n++;
- continue;
- }
- if (exp[s] == '(' && exp[s+1] == '?' &&
- (exp[s+2] == '{' || (exp[s+2] == '?' && exp[s+3] == '{')))
- {
- runtime = 1;
- break;
- }
- }
/* with runtime code, always recompile */
- if (!runtime) {
+ runtime_code = S_has_runtime_code(aTHX_ pRExC_state, expr, pm_flags,
+ exp, plen);
+ if (!runtime_code) {
ReREFCNT_inc(old_re);
if (used_setjump) {
JMPENV_POP;
return old_re;
}
}
+ else if ((pm_flags & PMf_USE_RE_EVAL)
+ /* this second condition covers the non-regex literal case,
+ * i.e. $foo =~ '(?{})'. */
+ || ( !PL_reg_state.re_reparsing && IN_PERL_COMPILETIME
+ && (PL_hints & HINT_RE_EVAL))
+ )
+ runtime_code = S_has_runtime_code(aTHX_ pRExC_state, expr, pm_flags,
+ exp, plen);
#ifdef TRIE_STUDY_OPT
restudied = 0;
RExC_precomp = exp;
RExC_flags = rx_flags;
RExC_pm_flags = pm_flags;
+
+ if (runtime_code) {
+ if (PL_tainting && PL_tainted)
+ Perl_croak(aTHX_ "Eval-group in insecure regular expression");
+
+ if (!S_compile_runtime_code(aTHX_ pRExC_state, exp, plen)) {
+ /* whoops, we have a non-utf8 pattern, whilst run-time code
+ * got compiled as utf8. Try again with a utf8 pattern */
+ JMPENV_JUMP(UTF8_LONGJMP);
+ }
+ }
+ assert(!pRExC_state->runtime_code_qr);
+
RExC_sawback = 0;
RExC_seen = 0;
RExC_in_lookbehind = 0;
RExC_seen_zerolen = *exp == '^' ? -1 : 0;
- RExC_seen_evals = 0;
RExC_extralen = 0;
RExC_override_recoding = 0;
RExC_emit_bound = ri->program + RExC_size + 1;
pRExC_state->code_index = 0;
- /* Store the count of eval-groups for security checks: */
- RExC_rx->seen_evals = RExC_seen_evals;
REGC((U8)REG_MAGIC, (char*) RExC_emit++);
if (reg(pRExC_state, 0, &flags,1) == NULL) {
ReREFCNT_dec(rx);
else if ((!sawopen || !RExC_sawback) &&
(OP(first) == STAR &&
PL_regkind[OP(NEXTOPER(first))] == REG_ANY) &&
- !(r->extflags & RXf_ANCH) && !(RExC_seen & REG_SEEN_EVAL))
+ !(r->extflags & RXf_ANCH) && !pRExC_state->num_code_blocks)
{
/* turn .* into ^.* with an implied $*=1 */
const int type =
goto again;
}
if (sawplus && !sawlookahead && (!sawopen || !RExC_sawback)
- && !(RExC_seen & REG_SEEN_EVAL)) /* May examine pos and $& */
+ && !pRExC_state->num_code_blocks) /* May examine pos and $& */
/* x+ must match at the 1st pos of run of x's */
r->intflags |= PREGf_SKIP;
r->extflags |= RXf_GPOS_SEEN;
if (RExC_seen & REG_SEEN_LOOKBEHIND)
r->extflags |= RXf_LOOKBEHIND_SEEN;
- if (RExC_seen & REG_SEEN_EVAL)
+ if (pRExC_state->num_code_blocks)
r->extflags |= RXf_EVAL_SEEN;
if (RExC_seen & REG_SEEN_CANY)
r->extflags |= RXf_CANY_SEEN;
r->intflags |= PREGf_VERBARG_SEEN;
if (RExC_seen & REG_SEEN_CUTGROUP)
r->intflags |= PREGf_CUTGROUP_SEEN;
+ if (pm_flags & PMf_USE_RE_EVAL)
+ r->intflags |= PREGf_USE_RE_EVAL;
if (RExC_paren_names)
RXp_PAREN_NAMES(r) = MUTABLE_HV(SvREFCNT_inc(RExC_paren_names));
else
Perl_croak(aTHX_ "panic: bad flag %lx in reg_scan_name",
(unsigned long) flags);
}
- /* NOT REACHED */
+ assert(0); /* NOT REACHED */
}
return NULL;
}
num = sv_dat ? *((I32 *)SvPVX(sv_dat)) : 0;
}
goto gen_recurse_regop;
- /* NOT REACHED */
+ assert(0); /* NOT REACHED */
case '+':
if (!(RExC_parse[0] >= '1' && RExC_parse[0] <= '9')) {
RExC_parse++;
nextchar(pRExC_state);
return ret;
} /* named and numeric backreferences */
- /* NOT REACHED */
+ assert(0); /* NOT REACHED */
case '?': /* (??...) */
is_logical = 1;
/* FALL THROUGH */
case '{': /* (?{...}) */
{
- I32 count = 1;
U32 n = 0;
- char c;
- char *s = RExC_parse;
+ struct reg_code_block *cb;
RExC_seen_zerolen++;
- RExC_seen |= REG_SEEN_EVAL;
- if ( pRExC_state->num_code_blocks
- && pRExC_state->code_index < pRExC_state->num_code_blocks
- && pRExC_state->code_blocks[pRExC_state->code_index].start
- == (STRLEN)((RExC_parse -3 - (is_logical ? 1 : 0))
+ if ( !pRExC_state->num_code_blocks
+ || pRExC_state->code_index >= pRExC_state->num_code_blocks
+ || pRExC_state->code_blocks[pRExC_state->code_index].start
+ != (STRLEN)((RExC_parse -3 - (is_logical ? 1 : 0))
- RExC_start)
) {
- /* this is a pre-compiled literal (?{}) */
- struct reg_code_block *cb =
- &pRExC_state->code_blocks[pRExC_state->code_index];
- RExC_parse = RExC_start + cb->end;
- if (SIZE_ONLY)
- RExC_seen_evals++;
- else {
- OP *o = cb->block;
- if (cb->src_regex) {
- n = add_data(pRExC_state, 2, "rl");
- RExC_rxi->data->data[n] =
- (void*)SvREFCNT_inc((SV*)cb->src_regex);
- RExC_rxi->data->data[n+1] = (void*)o->op_next;
- }
- else {
- n = add_data(pRExC_state, 1,
- (RExC_pm_flags & PMf_HAS_CV) ? "L" : "l");
- RExC_rxi->data->data[n] = (void*)o->op_next;
- }
- }
- pRExC_state->code_index++;
+ if (RExC_pm_flags & PMf_USE_RE_EVAL)
+ FAIL("panic: Sequence (?{...}): no code block found\n");
+ FAIL("Eval-group not allowed at runtime, use re 'eval'");
}
- else {
- while (count && (c = *RExC_parse)) {
- if (c == '\\') {
- if (RExC_parse[1])
- RExC_parse++;
- }
- else if (c == '{')
- count++;
- else if (c == '}')
- count--;
- RExC_parse++;
- }
- if (*RExC_parse != ')') {
- RExC_parse = s;
- vFAIL("Sequence (?{...}) not terminated or not {}-balanced");
- }
- if (!SIZE_ONLY) {
- PAD *pad;
- OP_4tree *sop, *rop;
- SV * const sv = newSVpvn(s, RExC_parse - 1 - s);
-
- ENTER;
- Perl_save_re_context(aTHX);
- rop = Perl_sv_compile_2op_is_broken(aTHX_ sv, &sop, "re", &pad);
- sop->op_private |= OPpREFCOUNTED;
- /* re_dup will OpREFCNT_inc */
- OpREFCNT_set(sop, 1);
- LEAVE;
-
- n = add_data(pRExC_state, 3, "nop");
- RExC_rxi->data->data[n] = (void*)rop;
- RExC_rxi->data->data[n+1] = (void*)sop;
- RExC_rxi->data->data[n+2] = (void*)pad;
- SvREFCNT_dec(sv);
+ /* this is a pre-compiled code block (?{...}) */
+ cb = &pRExC_state->code_blocks[pRExC_state->code_index];
+ RExC_parse = RExC_start + cb->end;
+ if (!SIZE_ONLY) {
+ OP *o = cb->block;
+ if (cb->src_regex) {
+ n = add_data(pRExC_state, 2, "rl");
+ RExC_rxi->data->data[n] =
+ (void*)SvREFCNT_inc((SV*)cb->src_regex);
+ RExC_rxi->data->data[n+1] = (void*)o;
}
- else { /* First pass */
- if (PL_reginterp_cnt < ++RExC_seen_evals
- && IN_PERL_RUNTIME)
- /* No compiled RE interpolated, has runtime
- components ===> unsafe. */
- FAIL("Eval-group not allowed at runtime, use re 'eval'");
- if (PL_tainting && PL_tainted)
- FAIL("Eval-group in insecure regular expression");
- #if PERL_VERSION > 8
- if (IN_PERL_COMPILETIME)
- PL_cv_has_eval = 1;
- #endif
+ else {
+ n = add_data(pRExC_state, 1,
+ (RExC_pm_flags & PMf_HAS_CV) ? "L" : "l");
+ RExC_rxi->data->data[n] = (void*)o;
}
}
+ pRExC_state->code_index++;
nextchar(pRExC_state);
if (is_logical) {
+ regnode *eval;
ret = reg_node(pRExC_state, LOGICAL);
- if (!SIZE_ONLY)
+ eval = reganode(pRExC_state, EVAL, n);
+ if (!SIZE_ONLY) {
ret->flags = 2;
- REGTAIL(pRExC_state, ret, reganode(pRExC_state, EVAL, n));
+ /* 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;
}
}
else
FAIL("Junk on end of regexp"); /* "Can't happen". */
- /* NOTREACHED */
+ assert(0); /* NOTREACHED */
}
if (RExC_in_lookbehind) {
sequence, we return.
Note: we have to be careful with escapes, as they can be both literal
- and special, and in the case of \10 and friends can either, depending
- on context. Specifically there are two separate switches for handling
+ and special, and in the case of \10 and friends, context determines which.
+
+ A summary of the code structure is:
+
+ switch (first_byte) {
+ cases for each special:
+ handle this special;
+ break;
+ case '\\':
+ switch (2nd byte) {
+ cases for each unambiguous special:
+ handle this special;
+ break;
+ cases for each ambigous special/literal:
+ disambiguate;
+ if (special) handle here
+ else goto defchar;
+ default: // unambiguously literal:
+ goto defchar;
+ }
+ default: // is a literal char
+ // FALL THROUGH
+ defchar:
+ create EXACTish node for literal;
+ while (more input and node isn't full) {
+ switch (input_byte) {
+ cases for each special;
+ make sure parse pointer is set so that the next call to
+ regatom will see this special first
+ goto loopdone; // EXACTish node terminated by prev. char
+ default:
+ append char to EXACTISH node;
+ }
+ get next input byte;
+ }
+ loopdone:
+ }
+ return the generated node;
+
+ Specifically there are two separate switches for handling
escape sequences, with the one for handling literal escapes requiring
a dummy entry for all of the special escapes that are actually handled
by the other.
vFAIL("Reference to nonexistent or unclosed group");
}
if (!isg && num > 9 && num >= RExC_npar)
+ /* Probably a character specified in octal, e.g. \35 */
goto defchar;
else {
char * const parse_start = RExC_parse - 1; /* MJD */
break;
}
case 'x':
- if (*++p == '{') {
- char* const e = strchr(p, '}');
+ {
+ STRLEN brace_len = len;
+ UV result;
+ const char* error_msg;
- if (!e) {
- RExC_parse = p + 1;
- vFAIL("Missing right brace on \\x{}");
+ bool valid = grok_bslash_x(p,
+ &result,
+ &brace_len,
+ &error_msg,
+ 1);
+ p += brace_len;
+ if (! valid) {
+ RExC_parse = p; /* going to die anyway; point
+ to exact spot of failure */
+ vFAIL(error_msg);
}
else {
- I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
- | PERL_SCAN_DISALLOW_PREFIX;
- STRLEN numlen = e - p - 1;
- ender = grok_hex(p + 1, &numlen, &flags, NULL);
- if (ender > 0xff)
- REQUIRE_UTF8;
- p = e + 1;
+ ender = result;
}
+ if (PL_encoding && ender < 0x100) {
+ goto recode_encoding;
+ }
+ if (ender > 0xff) {
+ REQUIRE_UTF8;
+ }
+ break;
}
- else {
- I32 flags = PERL_SCAN_DISALLOW_PREFIX;
- STRLEN numlen = 2;
- ender = grok_hex(p, &numlen, &flags, NULL);
- p += numlen;
- }
- if (PL_encoding && ender < 0x100)
- goto recode_encoding;
- break;
case 'c':
p++;
ender = grok_bslash_c(*p++, UTF, SIZE_ONLY);
break;
case '0': case '1': case '2': case '3':case '4':
- case '5': case '6': case '7': case '8':case '9':
+ case '5': case '6': case '7':
if (*p == '0' ||
(isDIGIT(p[1]) && atoi(p) >= RExC_npar))
{
FAIL("Trailing \\");
/* FALL THROUGH */
default:
- if (!SIZE_ONLY&& isALPHA(*p)) {
+ if (!SIZE_ONLY&& isALNUMC(*p)) {
ckWARN2reg(p + 1, "Unrecognized escape \\%.1s passed through", p);
}
goto normal_default;
}
break;
case 'x':
- if (*RExC_parse == '{') {
- I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
- | PERL_SCAN_DISALLOW_PREFIX;
- char * const e = strchr(RExC_parse++, '}');
- if (!e)
- vFAIL("Missing right brace on \\x{}");
-
- numlen = e - RExC_parse;
- value = grok_hex(RExC_parse, &numlen, &flags, NULL);
- RExC_parse = e + 1;
- }
- else {
- I32 flags = PERL_SCAN_DISALLOW_PREFIX;
- numlen = 2;
- value = grok_hex(RExC_parse, &numlen, &flags, NULL);
+ RExC_parse--; /* function expects to be pointed at the 'x' */
+ {
+ const char* error_msg;
+ bool valid = grok_bslash_x(RExC_parse,
+ &value,
+ &numlen,
+ &error_msg,
+ 1);
RExC_parse += numlen;
+ if (! valid) {
+ vFAIL(error_msg);
+ }
}
if (PL_encoding && value < 0x100)
goto recode_encoding;
if (ri->data) {
int n = ri->data->count;
- PAD* new_comppad = NULL;
- PAD* old_comppad;
- PADOFFSET refcnt;
while (--n >= 0) {
/* If you add a ->what type here, update the comment in regcomp.h */
case 'f':
Safefree(ri->data->data[n]);
break;
- case 'p':
- new_comppad = MUTABLE_AV(ri->data->data[n]);
- break;
- case 'o':
- if (new_comppad == NULL)
- Perl_croak(aTHX_ "panic: pregfree comppad");
- PAD_SAVE_LOCAL(old_comppad,
- /* Watch out for global destruction's random ordering. */
- (SvTYPE(new_comppad) == SVt_PVAV) ? new_comppad : NULL
- );
- OP_REFCNT_LOCK;
- refcnt = OpREFCNT_dec((OP_4tree*)ri->data->data[n]);
- OP_REFCNT_UNLOCK;
- if (!refcnt)
- op_free((OP_4tree*)ri->data->data[n]);
-
- PAD_RESTORE_LOCAL(old_comppad);
- SvREFCNT_dec(MUTABLE_SV(new_comppad));
- new_comppad = NULL;
- break;
case 'l':
case 'L':
- case 'n':
break;
case 'T':
{ /* Aho Corasick add-on structure for a trie node.
for (i = 0; i < count; i++) {
d->what[i] = ri->data->what[i];
switch (d->what[i]) {
- /* legal options are one of: sSfpontTua
- see also regcomp.h and pregfree() */
+ /* see also regcomp.h and regfree_internal() */
case 'a': /* actually an AV, but the dup function is identical. */
case 'r':
case 's':
case 'S':
- case 'p': /* actually an AV, but the dup function is identical. */
case 'u': /* actually an HV, but the dup function is identical. */
d->data[i] = sv_dup_inc((const SV *)ri->data->data[i], param);
break;
struct regnode_charclass_class);
reti->regstclass = (regnode*)d->data[i];
break;
- case 'o':
- /* Compiled op trees are readonly and in shared memory,
- and can thus be shared without duplication. */
- OP_REFCNT_LOCK;
- d->data[i] = (void*)OpREFCNT_inc((OP*)ri->data->data[i]);
- OP_REFCNT_UNLOCK;
- break;
case 'T':
/* Trie stclasses are readonly and can thus be shared
* without duplication. We free the stclass in pregfree
/* Fall through */
case 'l':
case 'L':
- case 'n':
d->data[i] = ri->data->data[i];
break;
default:
Copy(&PL_reg_state, state, 1, struct re_save_state);
- PL_reg_start_tmp = 0;
- PL_reg_start_tmpl = 0;
PL_reg_oldsaved = NULL;
PL_reg_oldsavedlen = 0;
PL_reg_maxiter = 0;
https://perl5.git.perl.org / perl5.git / blobdiff