Upgrade to Archive-Tar-1.30. Since change #27571 is not included,
[p5sagit/p5-mst-13.2.git] / regexec.c
index 6b2270a..ac55c82 100644 (file)
--- a/regexec.c
+++ b/regexec.c
@@ -13,7 +13,6 @@
  * 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
@@ -79,7 +78,7 @@
 #define RF_tainted     1               /* tainted information used? */
 #define RF_warned      2               /* warned about big count? */
 #define RF_evaled      4               /* Did an EVAL with setting? */
-#define RF_utf8                8               /* String contains multibyte chars? */
+#define RF_utf8                8               /* Pattern contains multibyte chars? */
 
 #define UTF ((PL_reg_flags & RF_utf8) != 0)
 
@@ -196,14 +195,20 @@ S_regcppush(pTHX_ I32 parenfloor)
 }
 
 /* These are needed since we do not localize EVAL nodes: */
-#  define REGCP_SET(cp)  DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,         \
-                            "  Setting an EVAL scope, savestack=%"IVdf"\n",    \
-                            (IV)PL_savestack_ix)); cp = PL_savestack_ix
-
-#  define REGCP_UNWIND(cp)  DEBUG_EXECUTE_r(cp != PL_savestack_ix ?            \
-                               PerlIO_printf(Perl_debug_log,           \
-                               "  Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \
-                               (IV)(cp), (IV)PL_savestack_ix) : 0); regcpblow(cp)
+#define REGCP_SET(cp)                                           \
+    DEBUG_STATE_r(                                              \
+            PerlIO_printf(Perl_debug_log,                      \
+               "  Setting an EVAL scope, savestack=%"IVdf"\n", \
+               (IV)PL_savestack_ix));                          \
+    cp = PL_savestack_ix
+
+#define REGCP_UNWIND(cp)                                        \
+    DEBUG_STATE_r(                                              \
+        if (cp != PL_savestack_ix)                             \
+           PerlIO_printf(Perl_debug_log,                       \
+               "  Clearing an EVAL scope, savestack=%"IVdf"..%"IVdf"\n", \
+               (IV)(cp), (IV)PL_savestack_ix));                \
+    regcpblow(cp)
 
 STATIC char *
 S_regcppop(pTHX_ const regexp *rex)
@@ -358,7 +363,6 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
     const I32 multiline = prog->reganch & PMf_MULTILINE;
 #ifdef DEBUGGING
     const char * const i_strpos = strpos;
-    SV * const dsv = PERL_DEBUG_PAD_ZERO(0);
 #endif
 
     GET_RE_DEBUG_FLAGS_DECL;
@@ -366,34 +370,12 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
     RX_MATCH_UTF8_set(prog,do_utf8);
 
     if (prog->reganch & ROPT_UTF8) {
-       DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
-                             "UTF-8 regex...\n"));
        PL_reg_flags |= RF_utf8;
     }
-
-    DEBUG_EXECUTE_r({
-        const char *s   = PL_reg_match_utf8 ?
-                        sv_uni_display(dsv, sv, 60, UNI_DISPLAY_REGEX) :
-                        strpos;
-        const int   len = PL_reg_match_utf8 ?
-                        (int)strlen(s) : strend - strpos;
-        if (!PL_colorset)
-             reginitcolors();
-        if (PL_reg_match_utf8)
-            DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
-                                  "UTF-8 target...\n"));
-        PerlIO_printf(Perl_debug_log,
-                      "%sGuessing start of match, REx%s \"%s%.60s%s%s\" against \"%s%.*s%s%s\"...\n",
-                      PL_colors[4], PL_colors[5], PL_colors[0],
-                      prog->precomp,
-                      PL_colors[1],
-                      (strlen(prog->precomp) > 60 ? "..." : ""),
-                      PL_colors[0],
-                      (int)(len > 60 ? 60 : len),
-                      s, PL_colors[1],
-                      (len > 60 ? "..." : "")
+    DEBUG_EXECUTE_r( 
+        debug_start_match(prog, do_utf8, strpos, strend, 
+            "Guessing start of match for");
              );
-    });
 
     /* CHR_DIST() would be more correct here but it makes things slow. */
     if (prog->minlen > strend - strpos) {
@@ -524,14 +506,17 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
     /* Update the count-of-usability, remove useless subpatterns,
        unshift s.  */
 
-    DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s %s substr \"%s%.*s%s\"%s%s",
+    DEBUG_EXECUTE_r({
+        RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), 
+            SvPVX_const(check), RE_SV_DUMPLEN(check), 30);
+        PerlIO_printf(Perl_debug_log, "%s %s substr %s%s%s",
                          (s ? "Found" : "Did not find"),
-                         (check == (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) ? "anchored" : "floating"),
-                         PL_colors[0],
-                         (int)(SvCUR(check) - (SvTAIL(check)!=0)),
-                         SvPVX_const(check),
-                         PL_colors[1], (SvTAIL(check) ? "$" : ""),
-                         (s ? " at offset " : "...\n") ) );
+           (check == (do_utf8 ? prog->anchored_utf8 : prog->anchored_substr) 
+               ? "anchored" : "floating"),
+           quoted,
+           RE_SV_TAIL(check),
+           (s ? " at offset " : "...\n") ); 
+    });
 
     if (!s)
        goto fail_finish;
@@ -591,14 +576,15 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
                        must,
                        multiline ? FBMrf_MULTILINE : 0
                    );
-               DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
-                       "%s anchored substr \"%s%.*s%s\"%s",
+                DEBUG_EXECUTE_r({
+                    RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), 
+                        SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
+                    PerlIO_printf(Perl_debug_log, "%s anchored substr %s%s",
                        (s ? "Found" : "Contradicts"),
-                       PL_colors[0],
-                         (int)(SvCUR(must)
-                         - (SvTAIL(must)!=0)),
-                         SvPVX_const(must),
-                         PL_colors[1], (SvTAIL(must) ? "$" : "")));
+                        quoted, RE_SV_TAIL(must));
+                });                
+               
+                           
                if (!s) {
                    if (last1 >= last2) {
                        DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
@@ -651,12 +637,13 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
                              (unsigned char*)last + SvCUR(must)
                                  - (SvTAIL(must)!=0),
                              must, multiline ? FBMrf_MULTILINE : 0);
-           DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s floating substr \"%s%.*s%s\"%s",
+           DEBUG_EXECUTE_r({
+               RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), 
+                   SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
+               PerlIO_printf(Perl_debug_log, "%s floating substr %s%s",
                    (s ? "Found" : "Contradicts"),
-                   PL_colors[0],
-                     (int)(SvCUR(must) - (SvTAIL(must)!=0)),
-                     SvPVX_const(must),
-                     PL_colors[1], (SvTAIL(must) ? "$" : "")));
+                   quoted, RE_SV_TAIL(must));
+            });
            if (!s) {
                if (last1 == last) {
                    DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
@@ -913,6 +900,144 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
 /* annoyingly all the vars in this routine have different names from their counterparts
    in regmatch. /grrr */
 
+#define REXEC_TRIE_READ_CHAR(trie_type, trie, uc, uscan, len, uvc, charid,  \
+foldlen, foldbuf, uniflags) STMT_START {                                    \
+    switch (trie_type) {                                                    \
+    case trie_utf8_fold:                                                    \
+       if ( foldlen>0 ) {                                                  \
+           uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags );     \
+           foldlen -= len;                                                 \
+           uscan += len;                                                   \
+           len=0;                                                          \
+       } else {                                                            \
+           uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags );   \
+           uvc = to_uni_fold( uvc, foldbuf, &foldlen );                    \
+           foldlen -= UNISKIP( uvc );                                      \
+           uscan = foldbuf + UNISKIP( uvc );                               \
+       }                                                                   \
+       break;                                                              \
+    case trie_utf8:                                                         \
+       uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags );       \
+       break;                                                              \
+    case trie_plain:                                                        \
+       uvc = (UV)*uc;                                                      \
+       len = 1;                                                            \
+    }                                                                       \
+                                                                           \
+    if (uvc < 256) {                                                        \
+       charid = trie->charmap[ uvc ];                                      \
+    }                                                                       \
+    else {                                                                  \
+       charid = 0;                                                         \
+       if (trie->widecharmap) {                                            \
+           SV** const svpp = hv_fetch(trie->widecharmap,                   \
+                       (char*)&uvc, sizeof(UV), 0);                        \
+           if (svpp)                                                       \
+               charid = (U16)SvIV(*svpp);                                  \
+       }                                                                   \
+    }                                                                       \
+} STMT_END
+
+#define REXEC_FBC_EXACTISH_CHECK(CoNd)                  \
+    if ( (CoNd)                                        \
+        && (ln == len ||                              \
+            ibcmp_utf8(s, NULL, 0,  do_utf8,          \
+                       m, NULL, ln, (bool)UTF))       \
+        && (!reginfo || regtry(reginfo, s)) )         \
+       goto got_it;                                   \
+    else {                                             \
+        U8 foldbuf[UTF8_MAXBYTES_CASE+1];             \
+        uvchr_to_utf8(tmpbuf, c);                     \
+        f = to_utf8_fold(tmpbuf, foldbuf, &foldlen);  \
+        if ( f != c                                   \
+             && (f == c1 || f == c2)                  \
+             && (ln == foldlen ||                     \
+                 !ibcmp_utf8((char *) foldbuf,        \
+                             NULL, foldlen, do_utf8,  \
+                             m,                       \
+                             NULL, ln, (bool)UTF))    \
+             && (!reginfo || regtry(reginfo, s)) )    \
+             goto got_it;                             \
+    }                                                  \
+    s += len
+
+#define REXEC_FBC_EXACTISH_SCAN(CoNd)                     \
+STMT_START {                                              \
+    while (s <= e) {                                      \
+       if ( (CoNd)                                       \
+            && (ln == 1 || !(OP(c) == EXACTF             \
+                             ? ibcmp(s, m, ln)           \
+                             : ibcmp_locale(s, m, ln)))  \
+            && (!reginfo || regtry(reginfo, s)) )        \
+           goto got_it;                                  \
+       s++;                                              \
+    }                                                     \
+} STMT_END
+
+#define REXEC_FBC_UTF8_SCAN(CoDe)                     \
+STMT_START {                                          \
+    while (s + (uskip = UTF8SKIP(s)) <= strend) {     \
+       CoDe                                          \
+       s += uskip;                                   \
+    }                                                 \
+} STMT_END
+
+#define REXEC_FBC_SCAN(CoDe)                          \
+STMT_START {                                          \
+    while (s < strend) {                              \
+       CoDe                                          \
+       s++;                                          \
+    }                                                 \
+} STMT_END
+
+#define REXEC_FBC_UTF8_CLASS_SCAN(CoNd)               \
+REXEC_FBC_UTF8_SCAN(                                  \
+    if (CoNd) {                                       \
+       if (tmp && (!reginfo || regtry(reginfo, s)))  \
+           goto got_it;                              \
+       else                                          \
+           tmp = doevery;                            \
+    }                                                 \
+    else                                              \
+       tmp = 1;                                      \
+)
+
+#define REXEC_FBC_CLASS_SCAN(CoNd)                    \
+REXEC_FBC_SCAN(                                       \
+    if (CoNd) {                                       \
+       if (tmp && (!reginfo || regtry(reginfo, s)))  \
+           goto got_it;                              \
+       else                                          \
+           tmp = doevery;                            \
+    }                                                 \
+    else                                              \
+       tmp = 1;                                      \
+)
+
+#define REXEC_FBC_TRYIT               \
+if ((!reginfo || regtry(reginfo, s))) \
+    goto got_it
+
+#define REXEC_FBC_CSCAN_PRELOAD(UtFpReLoAd,CoNdUtF8,CoNd)      \
+    if (do_utf8) {                                             \
+       UtFpReLoAd;                                            \
+       REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8);                   \
+    }                                                          \
+    else {                                                     \
+       REXEC_FBC_CLASS_SCAN(CoNd);                            \
+    }                                                          \
+    break
+
+#define REXEC_FBC_CSCAN_TAINT(CoNdUtF8,CoNd)                   \
+    PL_reg_flags |= RF_tainted;                                \
+    if (do_utf8) {                                             \
+       REXEC_FBC_UTF8_CLASS_SCAN(CoNdUtF8);                   \
+    }                                                          \
+    else {                                                     \
+       REXEC_FBC_CLASS_SCAN(CoNd);                            \
+    }                                                          \
+    break
+
 STATIC char *
 S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s, 
     const char *strend, const regmatch_info *reginfo)
@@ -933,20 +1058,10 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
        switch (OP(c)) {
        case ANYOF:
            if (do_utf8) {
-                while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                     if ((ANYOF_FLAGS(c) & ANYOF_UNICODE) ||
+                REXEC_FBC_UTF8_CLASS_SCAN((ANYOF_FLAGS(c) & ANYOF_UNICODE) ||
                          !UTF8_IS_INVARIANT((U8)s[0]) ?
                          reginclass(prog, c, (U8*)s, 0, do_utf8) :
-                         REGINCLASS(prog, c, (U8*)s)) {
-                          if (tmp && (!reginfo || regtry(reginfo, s)))
-                               goto got_it;
-                          else
-                               tmp = doevery;
-                     }
-                     else 
-                          tmp = 1;
-                     s += uskip;
-                }
+                         REGINCLASS(prog, c, (U8*)s));
            }
            else {
                 while (s < strend) {
@@ -969,13 +1084,12 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
            }
            break;
        case CANY:
-           while (s < strend) {
+           REXEC_FBC_SCAN(
                if (tmp && (!reginfo || regtry(reginfo, s)))
                    goto got_it;
                else
                    tmp = doevery;
-               s++;
-           }
+           );
            break;
        case EXACTF:
            m   = STRING(c);
@@ -1040,27 +1154,7 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                    while (s <= e) {
                        c = utf8n_to_uvchr((U8*)s, UTF8_MAXBYTES, &len,
                                           uniflags);
-                       if ( c == c1
-                            && (ln == len ||
-                                ibcmp_utf8(s, NULL, 0,  do_utf8,
-                                           m, NULL, ln, (bool)UTF))
-                            && (!reginfo || regtry(reginfo, s)) )
-                           goto got_it;
-                       else {
-                            U8 foldbuf[UTF8_MAXBYTES_CASE+1];
-                            uvchr_to_utf8(tmpbuf, c);
-                            f = to_utf8_fold(tmpbuf, foldbuf, &foldlen);
-                            if ( f != c
-                                 && (f == c1 || f == c2)
-                                 && (ln == foldlen ||
-                                     !ibcmp_utf8((char *) foldbuf,
-                                                 NULL, foldlen, do_utf8,
-                                                 m,
-                                                 NULL, ln, (bool)UTF))
-                                 && (!reginfo || regtry(reginfo, s)) )
-                                 goto got_it;
-                       }
-                       s += len;
+                       REXEC_FBC_EXACTISH_CHECK(c == c1);
                    }
                }
                else {
@@ -1079,51 +1173,15 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                            c == (UV)UNICODE_GREEK_SMALL_LETTER_FINAL_SIGMA)
                            c = (UV)UNICODE_GREEK_SMALL_LETTER_SIGMA;
 
-                       if ( (c == c1 || c == c2)
-                            && (ln == len ||
-                                ibcmp_utf8(s, NULL, 0,  do_utf8,
-                                           m, NULL, ln, (bool)UTF))
-                            && (!reginfo || regtry(reginfo, s)) )
-                           goto got_it;
-                       else {
-                            U8 foldbuf[UTF8_MAXBYTES_CASE+1];
-                            uvchr_to_utf8(tmpbuf, c);
-                            f = to_utf8_fold(tmpbuf, foldbuf, &foldlen);
-                            if ( f != c
-                                 && (f == c1 || f == c2)
-                                 && (ln == foldlen ||
-                                     !ibcmp_utf8((char *) foldbuf,
-                                                 NULL, foldlen, do_utf8,
-                                                 m,
-                                                 NULL, ln, (bool)UTF))
-                                 && (!reginfo || regtry(reginfo, s)) )
-                                 goto got_it;
-                       }
-                       s += len;
+                       REXEC_FBC_EXACTISH_CHECK(c == c1 || c == c2);
                    }
                }
            }
            else {
                if (c1 == c2)
-                   while (s <= e) {
-                       if ( *(U8*)s == c1
-                            && (ln == 1 || !(OP(c) == EXACTF
-                                             ? ibcmp(s, m, ln)
-                                             : ibcmp_locale(s, m, ln)))
-                            && (!reginfo || regtry(reginfo, s)) )
-                           goto got_it;
-                       s++;
-                   }
+                   REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1);
                else
-                   while (s <= e) {
-                       if ( (*(U8*)s == c1 || *(U8*)s == c2)
-                            && (ln == 1 || !(OP(c) == EXACTF
-                                             ? ibcmp(s, m, ln)
-                                             : ibcmp_locale(s, m, ln)))
-                            && (!reginfo || regtry(reginfo, s)) )
-                           goto got_it;
-                       s++;
-                   }
+                   REXEC_FBC_EXACTISH_SCAN(*(U8*)s == c1 || *(U8*)s == c2);
            }
            break;
        case BOUNDL:
@@ -1140,30 +1198,26 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                tmp = ((OP(c) == BOUND ?
                        isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0);
                LOAD_UTF8_CHARCLASS_ALNUM();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
+               REXEC_FBC_UTF8_SCAN(
                    if (tmp == !(OP(c) == BOUND ?
                                 (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) :
                                 isALNUM_LC_utf8((U8*)s)))
                    {
                        tmp = !tmp;
-                       if ((!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                   }
-                   s += uskip;
+                       REXEC_FBC_TRYIT;
                }
+               );
            }
            else {
                tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n';
                tmp = ((OP(c) == BOUND ? isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
-               while (s < strend) {
+               REXEC_FBC_SCAN(
                    if (tmp ==
                        !(OP(c) == BOUND ? isALNUM(*s) : isALNUM_LC(*s))) {
                        tmp = !tmp;
-                       if ((!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                   }
-                   s++;
+                       REXEC_FBC_TRYIT;
                }
+               );
            }
            if ((!prog->minlen && tmp) && (!reginfo || regtry(reginfo, s)))
                goto got_it;
@@ -1182,380 +1236,94 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                tmp = ((OP(c) == NBOUND ?
                        isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0);
                LOAD_UTF8_CHARCLASS_ALNUM();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
+               REXEC_FBC_UTF8_SCAN(
                    if (tmp == !(OP(c) == NBOUND ?
                                 (bool)swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) :
                                 isALNUM_LC_utf8((U8*)s)))
                        tmp = !tmp;
-                   else if ((!reginfo || regtry(reginfo, s)))
-                       goto got_it;
-                   s += uskip;
-               }
+                   else REXEC_FBC_TRYIT;
+               );
            }
            else {
                tmp = (s != PL_bostr) ? UCHARAT(s - 1) : '\n';
                tmp = ((OP(c) == NBOUND ?
                        isALNUM(tmp) : isALNUM_LC(tmp)) != 0);
-               while (s < strend) {
+               REXEC_FBC_SCAN(
                    if (tmp ==
                        !(OP(c) == NBOUND ? isALNUM(*s) : isALNUM_LC(*s)))
                        tmp = !tmp;
-                   else if ((!reginfo || regtry(reginfo, s)))
-                       goto got_it;
-                   s++;
-               }
+                   else REXEC_FBC_TRYIT;
+               );
            }
            if ((!prog->minlen && !tmp) && (!reginfo || regtry(reginfo, s)))
                goto got_it;
            break;
        case ALNUM:
-           if (do_utf8) {
-               LOAD_UTF8_CHARCLASS_ALNUM();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (isALNUM(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_PRELOAD(
+               LOAD_UTF8_CHARCLASS_ALNUM(),
+               swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8),
+               isALNUM(*s)
+           );
        case ALNUML:
-           PL_reg_flags |= RF_tainted;
-           if (do_utf8) {
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (isALNUM_LC_utf8((U8*)s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (isALNUM_LC(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_TAINT(
+               isALNUM_LC_utf8((U8*)s),
+               isALNUM_LC(*s)
+           );
        case NALNUM:
-           if (do_utf8) {
-               LOAD_UTF8_CHARCLASS_ALNUM();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (!swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (!isALNUM(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_PRELOAD(
+               LOAD_UTF8_CHARCLASS_ALNUM(),
+               !swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8),
+               !isALNUM(*s)
+           );
        case NALNUML:
-           PL_reg_flags |= RF_tainted;
-           if (do_utf8) {
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (!isALNUM_LC_utf8((U8*)s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (!isALNUM_LC(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_TAINT(
+               !isALNUM_LC_utf8((U8*)s),
+               !isALNUM_LC(*s)
+           );
        case SPACE:
-           if (do_utf8) {
-               LOAD_UTF8_CHARCLASS_SPACE();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (isSPACE(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_PRELOAD(
+               LOAD_UTF8_CHARCLASS_SPACE(),
+               *s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8),
+               isSPACE(*s)
+           );
        case SPACEL:
-           PL_reg_flags |= RF_tainted;
-           if (do_utf8) {
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (*s == ' ' || isSPACE_LC_utf8((U8*)s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (isSPACE_LC(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_TAINT(
+               *s == ' ' || isSPACE_LC_utf8((U8*)s),
+               isSPACE_LC(*s)
+           );
        case NSPACE:
-           if (do_utf8) {
-               LOAD_UTF8_CHARCLASS_SPACE();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (!(*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8))) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (!isSPACE(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_PRELOAD(
+               LOAD_UTF8_CHARCLASS_SPACE(),
+               !(*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8)),
+               !isSPACE(*s)
+           );
        case NSPACEL:
-           PL_reg_flags |= RF_tainted;
-           if (do_utf8) {
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (!(*s == ' ' || isSPACE_LC_utf8((U8*)s))) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (!isSPACE_LC(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_TAINT(
+               !(*s == ' ' || isSPACE_LC_utf8((U8*)s)),
+               !isSPACE_LC(*s)
+           );
        case DIGIT:
-           if (do_utf8) {
-               LOAD_UTF8_CHARCLASS_DIGIT();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (swash_fetch(PL_utf8_digit,(U8*)s, do_utf8)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (isDIGIT(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_PRELOAD(
+               LOAD_UTF8_CHARCLASS_DIGIT(),
+               swash_fetch(PL_utf8_digit,(U8*)s, do_utf8),
+               isDIGIT(*s)
+           );
        case DIGITL:
-           PL_reg_flags |= RF_tainted;
-           if (do_utf8) {
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (isDIGIT_LC_utf8((U8*)s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (isDIGIT_LC(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_TAINT(
+               isDIGIT_LC_utf8((U8*)s),
+               isDIGIT_LC(*s)
+           );
        case NDIGIT:
-           if (do_utf8) {
-               LOAD_UTF8_CHARCLASS_DIGIT();
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (!swash_fetch(PL_utf8_digit,(U8*)s, do_utf8)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (!isDIGIT(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_PRELOAD(
+               LOAD_UTF8_CHARCLASS_DIGIT(),
+               !swash_fetch(PL_utf8_digit,(U8*)s, do_utf8),
+               !isDIGIT(*s)
+           );
        case NDIGITL:
-           PL_reg_flags |= RF_tainted;
-           if (do_utf8) {
-               while (s + (uskip = UTF8SKIP(s)) <= strend) {
-                   if (!isDIGIT_LC_utf8((U8*)s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s += uskip;
-               }
-           }
-           else {
-               while (s < strend) {
-                   if (!isDIGIT_LC(*s)) {
-                       if (tmp && (!reginfo || regtry(reginfo, s)))
-                           goto got_it;
-                       else
-                           tmp = doevery;
-                   }
-                   else
-                       tmp = 1;
-                   s++;
-               }
-           }
-           break;
+           REXEC_FBC_CSCAN_TAINT(
+               !isDIGIT_LC_utf8((U8*)s),
+               !isDIGIT_LC(*s)
+           );
        case TRIE: 
            /*Perl_croak(aTHX_ "panic: unknown regstclass TRIE");*/
            {
@@ -1569,7 +1337,9 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                reg_trie_data *trie=aho->trie;
 
                const char *last_start = strend - trie->minlen;
+#ifdef DEBUGGING
                const char *real_start = s;
+#endif
                STRLEN maxlen = trie->maxlen;
                SV *sv_points;
                U8 **points; /* map of where we were in the input string
@@ -1622,41 +1392,8 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                             if (base==0) break;
                         }
                         points[pointpos++ % maxlen]= uc;
-                        switch (trie_type) {
-                        case trie_utf8_fold:
-                            if ( foldlen>0 ) {
-                                uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags );
-                                foldlen -= len;
-                                uscan += len;
-                                len=0;
-                            } else {
-                                uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags );
-                                uvc = to_uni_fold( uvc, foldbuf, &foldlen );
-                                foldlen -= UNISKIP( uvc );
-                                uscan = foldbuf + UNISKIP( uvc );
-                            }
-                            break;
-                        case trie_utf8:
-                            uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN,
-                                                        &len, uniflags );
-                            break;
-                        case trie_plain:
-                            uvc = (UV)*uc;
-                            len = 1;
-                        }
-
-                        if (uvc < 256) {
-                            charid = trie->charmap[ uvc ];
-                        }
-                        else {
-                            charid = 0;
-                            if (trie->widecharmap) {
-                                SV** const svpp = hv_fetch(trie->widecharmap,
-                                    (char*)&uvc, sizeof(UV), 0);
-                                if (svpp)
-                                    charid = (U16)SvIV(*svpp);
-                            }
-                        }
+                       REXEC_TRIE_READ_CHAR(trie_type, trie, uc, uscan, len,
+                           uvc, charid, foldlen, foldbuf, uniflags);
                         DEBUG_TRIE_EXECUTE_r(
                             PerlIO_printf(Perl_debug_log,
                                 "Pos: %d Charid:%3x CV:%4"UVxf" ",
@@ -1665,14 +1402,16 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                         uc += len;
 
                         do {
+#ifdef DEBUGGING
                             U32 word = aho->states[ state ].wordnum;
+#endif
                             base = aho->states[ state ].trans.base;
 
                             DEBUG_TRIE_EXECUTE_r(
                                 PerlIO_printf( Perl_debug_log,
                                     "%sState: %4"UVxf", Base: 0x%-4"UVxf" uvc=%"UVxf" word=%"UVxf"\n",
                                     failed ? "Fail transition to " : "",
-                                    state, base, uvc, word)
+                                    (UV)state, (UV)base, (UV)uvc, (UV)word)
                             );
                             if ( base ) {
                                 U32 tmp;
@@ -1721,7 +1460,7 @@ S_find_byclass(pTHX_ regexp * prog, const regnode *c, char *s,
                         PerlIO_printf( Perl_debug_log,
                             "%sState: %4"UVxf", Base: 0x%-4"UVxf" uvc=%"UVxf"\n",
                             "All done: ",
-                            state, base, uvc)
+                            (UV)state, (UV)base, (UV)uvc)
                     );
                     if (leftmost) {
                         s = (char*)leftmost;
@@ -1772,10 +1511,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
     SV* const oreplsv = GvSV(PL_replgv);
     const bool do_utf8 = DO_UTF8(sv);
     I32 multiline;
-#ifdef DEBUGGING
-    SV* dsv0;
-    SV* dsv1;
-#endif
+
     regmatch_info reginfo;  /* create some info to pass to regtry etc */
 
     GET_RE_DEBUG_FLAGS_DECL;
@@ -1791,11 +1527,6 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
     multiline = prog->reganch & PMf_MULTILINE;
     reginfo.prog = prog;
 
-#ifdef DEBUGGING
-    dsv0 = PERL_DEBUG_PAD_ZERO(0);
-    dsv1 = PERL_DEBUG_PAD_ZERO(1);
-#endif
-
     RX_MATCH_UTF8_set(prog, do_utf8);
 
     minlen = prog->minlen;
@@ -1863,29 +1594,10 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
        }
     }
 
-    DEBUG_EXECUTE_r({
-       const char * const s0   = UTF
-           ? pv_uni_display(dsv0, (U8*)prog->precomp, prog->prelen, 60,
-                         UNI_DISPLAY_REGEX)
-           : prog->precomp;
-       const int len0 = UTF ? (int)SvCUR(dsv0) : prog->prelen;
-       const char * const s1 = do_utf8 ? sv_uni_display(dsv1, sv, 60,
-                                              UNI_DISPLAY_REGEX) : startpos;
-       const int len1 = do_utf8 ? (int)SvCUR(dsv1) : strend - startpos;
-        if (!PL_colorset)
-            reginitcolors();
-        PerlIO_printf(Perl_debug_log,
-                      "%sMatching REx%s \"%s%*.*s%s%s\" against \"%s%.*s%s%s\"\n",
-                      PL_colors[4], PL_colors[5], PL_colors[0],
-                      len0, len0, s0,
-                      PL_colors[1],
-                      len0 > 60 ? "..." : "",
-                      PL_colors[0],
-                      (int)(len1 > 60 ? 60 : len1),
-                      s1, PL_colors[1],
-                      (len1 > 60 ? "..." : "")
+    DEBUG_EXECUTE_r( 
+        debug_start_match(prog, do_utf8, startpos, strend, 
+            "Matching");
              );
-    });
 
     /* Simplest case:  anchored match need be tried only once. */
     /*  [unless only anchor is BOL and multiline is set] */
@@ -1949,7 +1661,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
        ch = SvPVX_const(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)[0];
 
        if (do_utf8) {
-           while (s < strend) {
+           REXEC_FBC_SCAN(
                if (*s == ch) {
                    DEBUG_EXECUTE_r( did_match = 1 );
                    if (regtry(&reginfo, s)) goto got_it;
@@ -1957,11 +1669,10 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
                    while (s < strend && *s == ch)
                        s += UTF8SKIP(s);
                }
-               s += UTF8SKIP(s);
-           }
+           );
        }
        else {
-           while (s < strend) {
+           REXEC_FBC_SCAN(
                if (*s == ch) {
                    DEBUG_EXECUTE_r( did_match = 1 );
                    if (regtry(&reginfo, s)) goto got_it;
@@ -1969,8 +1680,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
                    while (s < strend && *s == ch)
                        s++;
                }
-               s++;
-           }
+           );
        }
        DEBUG_EXECUTE_r(if (!did_match)
                PerlIO_printf(Perl_debug_log,
@@ -2055,16 +1765,14 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
                }
            }
        }
-       DEBUG_EXECUTE_r(if (!did_match)
-                    PerlIO_printf(Perl_debug_log, 
-                                  "Did not find %s substr \"%s%.*s%s\"%s...\n",
+       DEBUG_EXECUTE_r(if (!did_match) {
+            RE_PV_QUOTED_DECL(quoted, do_utf8, PERL_DEBUG_PAD_ZERO(0), 
+                SvPVX_const(must), RE_SV_DUMPLEN(must), 30);
+            PerlIO_printf(Perl_debug_log, "Did not find %s substr %s%s...\n",
                              ((must == prog->anchored_substr || must == prog->anchored_utf8)
                               ? "anchored" : "floating"),
-                             PL_colors[0],
-                             (int)(SvCUR(must) - (SvTAIL(must)!=0)),
-                             SvPVX_const(must),
-                                  PL_colors[1], (SvTAIL(must) ? "$" : ""))
-               );
+                quoted, RE_SV_TAIL(must));
+        });                
        goto phooey;
     }
     else if ((c = prog->regstclass)) {
@@ -2076,24 +1784,15 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
        }
        DEBUG_EXECUTE_r({
            SV * const prop = sv_newmortal();
-           const char *s0;
-           const char *s1;
-           int len0;
-           int len1;
-
            regprop(prog, prop, c);
-           s0 = UTF ?
-             pv_uni_display(dsv0, (U8*)SvPVX_const(prop), SvCUR(prop), 60,
-                            UNI_DISPLAY_REGEX) :
-             SvPVX_const(prop);
-           len0 = UTF ? SvCUR(dsv0) : SvCUR(prop);
-           s1 = UTF ?
-             sv_uni_display(dsv1, sv, 60, UNI_DISPLAY_REGEX) : s;
-           len1 = UTF ? (int)SvCUR(dsv1) : strend - s;
-           PerlIO_printf(Perl_debug_log,
-                         "Matching stclass \"%*.*s\" against \"%*.*s\" (%d chars)\n",
-                         len0, len0, s0,
-                         len1, len1, s1, (int)(strend - s));
+           {
+               RE_PV_QUOTED_DECL(quoted,UTF,PERL_DEBUG_PAD_ZERO(1),
+                   s,strend-s,60);
+               PerlIO_printf(Perl_debug_log,
+                   "Matching stclass %.*s against %s (%d chars)\n",
+                   (int)SvCUR(prop), SvPVX_const(prop),
+                    quoted, (int)(strend - s));
+           }
        });
         if (find_byclass(prog, c, s, strend, &reginfo))
            goto got_it;
@@ -2371,54 +2070,14 @@ S_regtry(pTHX_ const regmatch_info *reginfo, char *startpos)
 #define sayNO_SILENT goto do_no
 #define saySAME(x) if (x) goto yes; else goto no
 
-#define POSCACHE_SUCCESS 0     /* caching success rather than failure */
-#define POSCACHE_SEEN 1                /* we know what we're caching */
-#define POSCACHE_START 2       /* the real cache: this bit maps to pos 0 */
-
-#define CACHEsayYES STMT_START { \
-    if (st->u.whilem.cache_offset | st->u.whilem.cache_bit) { \
-       if (!(PL_reg_poscache[0] & (1<<POSCACHE_SEEN))) { \
-           PL_reg_poscache[0] |= (1<<POSCACHE_SUCCESS) | (1<<POSCACHE_SEEN); \
-           PL_reg_poscache[st->u.whilem.cache_offset] |= (1<<st->u.whilem.cache_bit); \
-       } \
-        else if (PL_reg_poscache[0] & (1<<POSCACHE_SUCCESS)) { \
-           PL_reg_poscache[st->u.whilem.cache_offset] |= (1<<st->u.whilem.cache_bit); \
-       } \
-       else { \
-           /* cache records failure, but this is success */ \
-           DEBUG_r( \
-               PerlIO_printf(Perl_debug_log, \
-                   "%*s  (remove success from failure cache)\n", \
-                   REPORT_CODE_OFF+PL_regindent*2, "") \
-           ); \
-           PL_reg_poscache[st->u.whilem.cache_offset] &= ~(1<<st->u.whilem.cache_bit); \
-       } \
-    } \
-    sayYES; \
-} STMT_END
-
 #define CACHEsayNO STMT_START { \
-    if (st->u.whilem.cache_offset | st->u.whilem.cache_bit) { \
-       if (!(PL_reg_poscache[0] & (1<<POSCACHE_SEEN))) { \
-           PL_reg_poscache[0] |= (1<<POSCACHE_SEEN); \
-           PL_reg_poscache[st->u.whilem.cache_offset] |= (1<<st->u.whilem.cache_bit); \
-       } \
-        else if (!(PL_reg_poscache[0] & (1<<POSCACHE_SUCCESS))) { \
-           PL_reg_poscache[st->u.whilem.cache_offset] |= (1<<st->u.whilem.cache_bit); \
-       } \
-       else { \
-           /* cache records success, but this is failure */ \
-           DEBUG_r( \
-               PerlIO_printf(Perl_debug_log, \
-                   "%*s  (remove failure from success cache)\n", \
-                   REPORT_CODE_OFF+PL_regindent*2, "") \
-           ); \
-           PL_reg_poscache[st->u.whilem.cache_offset] &= ~(1<<st->u.whilem.cache_bit); \
-       } \
-    } \
+    if (st->u.whilem.cache_offset | st->u.whilem.cache_bit) \
+       PL_reg_poscache[st->u.whilem.cache_offset] |= \
+           (1<<st->u.whilem.cache_bit); \
     sayNO; \
 } STMT_END
 
+
 /* this is used to determine how far from the left messages like
    'failed...' are printed. Currently 29 makes these messages line
    up with the opcode they refer to. Earlier perls used 25 which
@@ -2616,8 +2275,34 @@ S_push_slab(pTHX)
 
 #define REG_NODE_NUM(x) ((x) ? (int)((x)-prog) : -1)
 
-#ifdef DEBUGGING 
-STATIC void 
+#ifdef DEBUGGING
+STATIC void
+S_debug_start_match(pTHX_ const regexp *prog, const bool do_utf8, 
+    const char *start, const char *end, const char *blurb)
+{
+    const bool utf8_pat= prog->reganch & ROPT_UTF8 ? 1 : 0;
+    if (!PL_colorset)   
+            reginitcolors();    
+    {
+        RE_PV_QUOTED_DECL(s0, utf8_pat, PERL_DEBUG_PAD_ZERO(0), 
+            prog->precomp, prog->prelen, 60);   
+        
+        RE_PV_QUOTED_DECL(s1, do_utf8, PERL_DEBUG_PAD_ZERO(1), 
+            start, end - start, 60); 
+        
+        PerlIO_printf(Perl_debug_log, 
+            "%s%s REx%s %s against %s\n", 
+                      PL_colors[4], blurb, PL_colors[5], s0, s1); 
+        
+        if (do_utf8||utf8_pat) 
+            PerlIO_printf(Perl_debug_log, "UTF-8 %s...\n",
+                !do_utf8 ? "pattern" : !utf8_pat ? "string" : 
+                    "pattern and string"
+            ); 
+    }
+}
+
+STATIC void
 S_dump_exec_pos(pTHX_ const char *locinput, const regnode *scan, const bool do_utf8)
 {
     const int docolor = *PL_colors[0];
@@ -2646,40 +2331,30 @@ S_dump_exec_pos(pTHX_ const char *locinput, const regnode *scan, const bool do_u
     if (pref0_len > pref_len)
        pref0_len = pref_len;
     {
-      const char * const s0 =
-       do_utf8 && OP(scan) != CANY ?
-       pv_uni_display(PERL_DEBUG_PAD(0), (U8*)(locinput - pref_len),
-                      pref0_len, 60, UNI_DISPLAY_REGEX) :
-       locinput - pref_len;
-      const int len0 = do_utf8 ? (int)strlen(s0) : pref0_len;
-      const char * const s1 = do_utf8 && OP(scan) != CANY ?
-       pv_uni_display(PERL_DEBUG_PAD(1),
-                      (U8*)(locinput - pref_len + pref0_len),
-                      pref_len - pref0_len, 60, UNI_DISPLAY_REGEX) :
-       locinput - pref_len + pref0_len;
-      const int len1 = do_utf8 ? (int)strlen(s1) : pref_len - pref0_len;
-      const char * const s2 = do_utf8 && OP(scan) != CANY ?
-       pv_uni_display(PERL_DEBUG_PAD(2), (U8*)locinput,
-                      PL_regeol - locinput, 60, UNI_DISPLAY_REGEX) :
-       locinput;
-      const int len2 = do_utf8 ? (int)strlen(s2) : l;
-      PerlIO_printf(Perl_debug_log,
-                   "%4"IVdf" <%s%.*s%s%s%.*s%s%s%s%.*s%s>%*s|",
+       const int is_uni = (do_utf8 && OP(scan) != CANY) ? 1 : 0;
+
+       RE_PV_COLOR_DECL(s0,len0,is_uni,PERL_DEBUG_PAD(0),
+           (locinput - pref_len),pref0_len, 60, 4, 5);
+       
+       RE_PV_COLOR_DECL(s1,len1,is_uni,PERL_DEBUG_PAD(1),
+                   (locinput - pref_len + pref0_len),
+                   pref_len - pref0_len, 60, 2, 3);
+       
+       RE_PV_COLOR_DECL(s2,len2,is_uni,PERL_DEBUG_PAD(2),
+                   locinput, PL_regeol - locinput, 60, 0, 1);
+
+       PerlIO_printf(Perl_debug_log,
+                   "%4"IVdf" <%.*s%.*s%s%.*s>%*s|",
                    (IV)(locinput - PL_bostr),
-                   PL_colors[4],
                    len0, s0,
-                   PL_colors[5],
-                   PL_colors[2],
                    len1, s1,
-                   PL_colors[3],
                    (docolor ? "" : "> <"),
-                   PL_colors[0],
                    len2, s2,
-                   PL_colors[1],
                    15 - l - pref_len + 1,
                    "");
     }
 }
+
 #endif
 
 STATIC I32                     /* 0 failure, 1 success */
@@ -2708,7 +2383,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
 
     /* these variables are NOT saved during a recusive RFEGMATCH: */
     register I32 nextchr;   /* is always set to UCHARAT(locinput) */
-    bool result;           /* return value of S_regmatch */
+    bool result = 0;       /* return value of S_regmatch */
     int depth = 0;         /* depth of recursion */
     regmatch_state *yes_state = NULL; /* state to pop to on success of
                                                            subpattern */
@@ -2935,41 +2610,8 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                    });
 
                    if ( base ) {
-                       switch (trie_type) {
-                       case trie_utf8_fold:
-                           if ( foldlen>0 ) {
-                               uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags );
-                               foldlen -= len;
-                               uscan += len;
-                               len=0;
-                           } else {
-                               uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags );
-                               uvc = to_uni_fold( uvc, foldbuf, &foldlen );
-                               foldlen -= UNISKIP( uvc );
-                               uscan = foldbuf + UNISKIP( uvc );
-                           }
-                           break;
-                       case trie_utf8:
-                           uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN,
-                                                           &len, uniflags );
-                           break;
-                       case trie_plain:
-                           uvc = (UV)*uc;
-                           len = 1;
-                       }
-
-                       if (uvc < 256) {
-                           charid = trie->charmap[ uvc ];
-                       }
-                       else {
-                           charid = 0;
-                           if (trie->widecharmap) {
-                               SV** const svpp = hv_fetch(trie->widecharmap,
-                                           (char*)&uvc, sizeof(UV), 0);
-                               if (svpp)
-                                   charid = (U16)SvIV(*svpp);
-                           }
-                       }
+                       REXEC_TRIE_READ_CHAR(trie_type, trie, uc, uscan, len,
+                           uvc, charid, foldlen, foldbuf, uniflags);
 
                        if (charid &&
                             (base + charid > trie->uniquecharcount )
@@ -3585,14 +3227,9 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                }
 
                /* run the pattern returned from (??{...}) */
-
                DEBUG_EXECUTE_r(
-                   PerlIO_printf(Perl_debug_log,
-                                 "Entering embedded \"%s%.60s%s%s\"\n",
-                                 PL_colors[0],
-                                 re->precomp,
-                                 PL_colors[1],
-                                 (strlen(re->precomp) > 60 ? "..." : ""))
+                    debug_start_match(re, do_utf8, locinput, PL_regeol, 
+                        "Matching embedded");
                    );
 
                ST.cp = regcppush(0);   /* Save *all* the positions. */
@@ -3895,7 +3532,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                    PL_reg_leftiter = PL_reg_maxiter;
                }
                if (PL_reg_leftiter-- == 0) {
-                   const I32 size = (PL_reg_maxiter + 7 + POSCACHE_START)/8;
+                   const I32 size = (PL_reg_maxiter + 7)/8;
                    if (PL_reg_poscache) {
                        if ((I32)PL_reg_poscache_size < size) {
                            Renew(PL_reg_poscache, size, char);
@@ -3916,7 +3553,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                if (PL_reg_leftiter < 0) {
                    st->u.whilem.cache_offset = locinput - PL_bostr;
 
-                   st->u.whilem.cache_offset = (scan->flags & 0xf) - 1 + POSCACHE_START
+                   st->u.whilem.cache_offset = (scan->flags & 0xf) - 1
                            + st->u.whilem.cache_offset * (scan->flags>>4);
                    st->u.whilem.cache_bit = st->u.whilem.cache_offset % 8;
                    st->u.whilem.cache_offset /= 8;
@@ -3926,12 +3563,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                                      "%*s  already tried at this position...\n",
                                      REPORT_CODE_OFF+PL_regindent*2, "")
                        );
-                       if (PL_reg_poscache[0] & (1<<POSCACHE_SUCCESS))
-                           /* cache records success */
-                           sayYES;
-                       else
-                           /* cache records failure */
-                           sayNO_SILENT;
+                       sayNO; /* cache records failure */
                    }
                }
                }
@@ -3950,7 +3582,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                    st->cc = st->u.whilem.savecc;
                    if (result) {
                        regcpblow(st->u.whilem.cp);
-                       CACHEsayYES;    /* All done. */
+                       sayYES; /* All done. */
                    }
                    REGCP_UNWIND(st->u.whilem.lastcp);
                    regcppop(rex);
@@ -3983,7 +3615,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                    /*** all unsaved local vars undefined at this point */
                    if (result) {
                        regcpblow(st->u.whilem.cp);
-                       CACHEsayYES;
+                       sayYES;
                    }
                    REGCP_UNWIND(st->u.whilem.lastcp);
                    regcppop(rex);
@@ -4003,7 +3635,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                    /*** all unsaved local vars undefined at this point */
                    if (result) {
                        regcpblow(st->u.whilem.cp);
-                       CACHEsayYES;
+                       sayYES;
                    }
                    REGCP_UNWIND(st->u.whilem.lastcp);
                    regcppop(rex);      /* Restore some previous $<digit>s? */
@@ -4031,7 +3663,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                /*** all unsaved local vars undefined at this point */
                st->cc = st->u.whilem.savecc;
                if (result)
-                   CACHEsayYES;
+                   sayYES;
                if (st->cc->u.curlyx.outercc)
                    st->cc->u.curlyx.outercc->u.curlyx.cur = st->ln;
                st->cc->u.curlyx.cur = n - 1;
@@ -4143,7 +3775,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
            DEBUG_EXECUTE_r(
                PerlIO_printf(Perl_debug_log,
                          "%*s  CURLYM now matched %"IVdf" times, len=%"IVdf"...\n",
-                         (int)(REPORT_CODE_OFF+PL_regindent*2), "",
+                         (int)(REPORT_CODE_OFF+(PL_regindent*2)), "",
                          (IV) ST.count, (IV)ST.alen)
            );
 
@@ -4184,7 +3816,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
            DEBUG_EXECUTE_r(
                PerlIO_printf(Perl_debug_log,
                    "%*s  CURLYM trying tail with matches=%"IVdf"...\n",
-                   (int)(REPORT_CODE_OFF+PL_regindent*2),
+                   (int)(REPORT_CODE_OFF+(PL_regindent*2)),
                    "", (IV)ST.count)
                );
            if (ST.c1 != CHRTEST_VOID
@@ -4308,11 +3940,19 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
 
                             to_utf8_lower((U8*)s, tmpbuf1, &ulen1);
                             to_utf8_upper((U8*)s, tmpbuf2, &ulen2);
-
+#ifdef EBCDIC
+                            ST.c1 = utf8n_to_uvchr(tmpbuf1, UTF8_MAXLEN, 0,
+                                                   ckWARN(WARN_UTF8) ?
+                                                    0 : UTF8_ALLOW_ANY);
+                            ST.c2 = utf8n_to_uvchr(tmpbuf2, UTF8_MAXLEN, 0,
+                                                    ckWARN(WARN_UTF8) ?
+                                                    0 : UTF8_ALLOW_ANY);
+#else
                             ST.c1 = utf8n_to_uvuni(tmpbuf1, UTF8_MAXBYTES, 0,
-                                                uniflags);
+                                                   uniflags);
                             ST.c2 = utf8n_to_uvuni(tmpbuf2, UTF8_MAXBYTES, 0,
-                                                uniflags);
+                                                   uniflags);
+#endif
                        }
                        else {
                            ST.c2 = ST.c1 = utf8n_to_uvchr(s, UTF8_MAXBYTES, 0,
@@ -4489,7 +4129,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
                if (ST.c1 != CHRTEST_VOID)
                    c = do_utf8 ? utf8n_to_uvchr((U8*)PL_reginput,
                                           UTF8_MAXBYTES, 0, uniflags)
-                               : UCHARAT(PL_reginput);
+                               : (UV) UCHARAT(PL_reginput);
                /* If it could work, try it. */
                if (ST.c1 == CHRTEST_VOID || c == (UV)ST.c1 || c == (UV)ST.c2) {
                    CURLY_SETPAREN(ST.paren, ST.count);
@@ -4626,7 +4266,7 @@ S_regmatch(pTHX_ const regmatch_info *reginfo, regnode *prog)
            regmatch_state *newst;
 
            depth++;
-           DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
+           DEBUG_STATE_r(PerlIO_printf(Perl_debug_log,
                        "PUSH STATE(%d)\n", depth));
            st->locinput = locinput;
            newst = st+1; 
@@ -4707,8 +4347,8 @@ yes_final:
            st = SLAB_LAST(PL_regmatch_slab);
        }
        depth -= (st - yes_state);
-       DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "POP STATES (%d..%d)\n",
-           depth+1, depth+(st - yes_state)));
+       DEBUG_STATE_r(PerlIO_printf(Perl_debug_log, "POP STATES (%"UVuf"..%"UVuf")\n",
+           (UV)(depth+1), (UV)(depth+(st - yes_state))));
        st = yes_state;
        yes_state = st->u.yes.prev_yes_state;
        PL_regmatch_state = st;
@@ -4741,7 +4381,7 @@ yes:
      * will disappear when REGFMATCH goes */
     if (depth) {
        /* restore previous state and re-enter */
-       DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "POP STATE(%d)\n", depth));
+       DEBUG_STATE_r(PerlIO_printf(Perl_debug_log, "POP STATE(%d)\n", depth));
        depth--;
        st--;
        if (st < SLAB_FIRST(PL_regmatch_slab)) {
@@ -4804,7 +4444,7 @@ do_no:
 
     if (depth) {
        /* there's a previous state to backtrack to */
-       DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "POP STATE(%d)\n", depth));
+       DEBUG_STATE_r(PerlIO_printf(Perl_debug_log, "POP STATE(%d)\n", depth));
        depth--;
        st--;
        if (st < SLAB_FIRST(PL_regmatch_slab)) {