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Remove unused USING_WIDE code from win32 and wince branches
[perl5.git] / regcomp.c
index bc324ed..dd2188f 100644 (file)
--- a/regcomp.c
+++ b/regcomp.c
@@ -55,7 +55,6 @@
 #  define PERL_NO_GET_CONTEXT
 #endif
 
-/*SUPPRESS 112*/
 /*
  * pregcomp and pregexec -- regsub and regerror are not used in perl
  *
@@ -307,7 +306,7 @@ static const scan_data_t zero_scan_data =
  * Simple_vFAIL -- like FAIL, but marks the current location in the scan
  */
 #define        Simple_vFAIL(m) STMT_START {                                    \
-    IV offset = RExC_parse - RExC_precomp;                             \
+    const IV offset = RExC_parse - RExC_precomp;                       \
     Perl_croak(aTHX_ "%s" REPORT_LOCATION,                             \
            m, (int)offset, RExC_precomp, RExC_precomp + offset);       \
 } STMT_END
@@ -325,7 +324,7 @@ static const scan_data_t zero_scan_data =
  * Like Simple_vFAIL(), but accepts two arguments.
  */
 #define        Simple_vFAIL2(m,a1) STMT_START {                        \
-    IV offset = RExC_parse - RExC_precomp;                     \
+    const IV offset = RExC_parse - RExC_precomp;                       \
     S_re_croak2(aTHX_ m, REPORT_LOCATION, a1,                  \
            (int)offset, RExC_precomp, RExC_precomp + offset);  \
 } STMT_END
@@ -344,7 +343,7 @@ static const scan_data_t zero_scan_data =
  * Like Simple_vFAIL(), but accepts three arguments.
  */
 #define        Simple_vFAIL3(m, a1, a2) STMT_START {                   \
-    IV offset = RExC_parse - RExC_precomp;                     \
+    const IV offset = RExC_parse - RExC_precomp;               \
     S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2,              \
            (int)offset, RExC_precomp, RExC_precomp + offset);  \
 } STMT_END
@@ -362,29 +361,19 @@ static const scan_data_t zero_scan_data =
  * Like Simple_vFAIL(), but accepts four arguments.
  */
 #define        Simple_vFAIL4(m, a1, a2, a3) STMT_START {               \
-    IV offset = RExC_parse - RExC_precomp;                     \
+    const IV offset = RExC_parse - RExC_precomp;               \
     S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3,          \
            (int)offset, RExC_precomp, RExC_precomp + offset);  \
 } STMT_END
 
-/*
- * Like Simple_vFAIL(), but accepts five arguments.
- */
-#define        Simple_vFAIL5(m, a1, a2, a3, a4) STMT_START {           \
-    IV offset = RExC_parse - RExC_precomp;                     \
-    S_re_croak2(aTHX_ m, REPORT_LOCATION, a1, a2, a3, a4,      \
-           (int)offset, RExC_precomp, RExC_precomp + offset);  \
-} STMT_END
-
-
 #define        vWARN(loc,m) STMT_START {                                       \
-    IV offset = loc - RExC_precomp;                                    \
+    const IV offset = loc - RExC_precomp;                              \
     Perl_warner(aTHX_ packWARN(WARN_REGEXP), "%s" REPORT_LOCATION,     \
            m, (int)offset, RExC_precomp, RExC_precomp + offset);       \
 } STMT_END
 
 #define        vWARNdep(loc,m) STMT_START {                                    \
-    IV offset = loc - RExC_precomp;                                    \
+    const IV offset = loc - RExC_precomp;                              \
     Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_REGEXP),         \
            "%s" REPORT_LOCATION,                                       \
            m, (int)offset, RExC_precomp, RExC_precomp + offset);       \
@@ -392,25 +381,25 @@ static const scan_data_t zero_scan_data =
 
 
 #define        vWARN2(loc, m, a1) STMT_START {                                 \
-    IV offset = loc - RExC_precomp;                                    \
+    const IV offset = loc - RExC_precomp;                              \
     Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION,                \
            a1, (int)offset, RExC_precomp, RExC_precomp + offset);      \
 } STMT_END
 
 #define        vWARN3(loc, m, a1, a2) STMT_START {                             \
-    IV offset = loc - RExC_precomp;                                    \
+    const IV offset = loc - RExC_precomp;                              \
     Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION,                \
            a1, a2, (int)offset, RExC_precomp, RExC_precomp + offset);  \
 } STMT_END
 
 #define        vWARN4(loc, m, a1, a2, a3) STMT_START {                         \
-    IV offset = loc - RExC_precomp;                                    \
+    const IV offset = loc - RExC_precomp;                              \
     Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION,                \
            a1, a2, a3, (int)offset, RExC_precomp, RExC_precomp + offset); \
 } STMT_END
 
 #define        vWARN5(loc, m, a1, a2, a3, a4) STMT_START {                     \
-    IV offset = loc - RExC_precomp;                                    \
+    const IV offset = loc - RExC_precomp;                              \
     Perl_warner(aTHX_ packWARN(WARN_REGEXP), m REPORT_LOCATION,                \
            a1, a2, a3, a4, (int)offset, RExC_precomp, RExC_precomp + offset); \
 } STMT_END
@@ -436,7 +425,7 @@ static const scan_data_t zero_scan_data =
        MJD_OFFSET_DEBUG(("** (%d) offset of node %d is %d.\n",         \
                __LINE__, (node), (byte)));                             \
        if((node) < 0) {                                                \
-           Perl_croak(aTHX_ "value of node is %d in Offset macro", node); \
+           Perl_croak(aTHX_ "value of node is %d in Offset macro", (int)(node)); \
        } else {                                                        \
            RExC_offsets[2*(node)-1] = (byte);                          \
        }                                                               \
@@ -450,9 +439,9 @@ static const scan_data_t zero_scan_data =
 #define Set_Node_Length_To_R(node,len) STMT_START {                    \
     if (! SIZE_ONLY) {                                                 \
        MJD_OFFSET_DEBUG(("** (%d) size of node %d is %d.\n",           \
-               __LINE__, (node), (len)));                              \
+               __LINE__, (int)(node), (int)(len)));                    \
        if((node) < 0) {                                                \
-           Perl_croak(aTHX_ "value of node is %d in Length macro", node); \
+           Perl_croak(aTHX_ "value of node is %d in Length macro", (int)(node)); \
        } else {                                                        \
            RExC_offsets[2*(node)] = (len);                             \
        }                                                               \
@@ -507,8 +496,8 @@ S_scan_commit(pTHX_ RExC_state_t *pRExC_state, scan_data_t *data)
     }
     SvCUR_set(data->last_found, 0);
     {
-       SV * sv = data->last_found;
-       MAGIC *mg =
+       SV * const sv = data->last_found;
+       MAGIC * const mg =
            SvUTF8(sv) && SvMAGICAL(sv) ? mg_find(sv, PERL_MAGIC_utf8) : NULL;
        if (mg && mg->mg_len > 0)
            mg->mg_len = 0;
@@ -530,7 +519,7 @@ S_cl_anything(pTHX_ RExC_state_t *pRExC_state, struct regnode_charclass_class *c
 
 /* Can match anything (initialization) */
 STATIC int
-S_cl_is_anything(pTHX_ struct regnode_charclass_class *cl)
+S_cl_is_anything(pTHX_ const struct regnode_charclass_class *cl)
 {
     int value;
 
@@ -567,7 +556,7 @@ S_cl_init_zero(pTHX_ RExC_state_t *pRExC_state, struct regnode_charclass_class *
 /* We assume that cl is not inverted */
 STATIC void
 S_cl_and(pTHX_ struct regnode_charclass_class *cl,
-        struct regnode_charclass_class *and_with)
+       const struct regnode_charclass_class *and_with)
 {
     if (!(and_with->flags & ANYOF_CLASS)
        && !(cl->flags & ANYOF_CLASS)
@@ -603,7 +592,7 @@ S_cl_and(pTHX_ struct regnode_charclass_class *cl,
 /* 'OR' a given class with another one.  Can create false positives */
 /* We assume that cl is not inverted */
 STATIC void
-S_cl_or(pTHX_ RExC_state_t *pRExC_state, struct regnode_charclass_class *cl, struct regnode_charclass_class *or_with)
+S_cl_or(pTHX_ RExC_state_t *pRExC_state, struct regnode_charclass_class *cl, const struct regnode_charclass_class *or_with)
 {
     if (or_with->flags & ANYOF_INVERT) {
        /* We do not use
@@ -776,7 +765,7 @@ and would end up looking like:
     DEBUG_TRIE_COMPILE_r({                                                 \
        SV *tmp;                                                           \
        if ( UTF ) {                                                       \
-           tmp = newSVpv( "", 0 );                                        \
+           tmp = newSVpvn( "", 0 );                                       \
            pv_uni_display( tmp, uc, len, 60, UNI_DISPLAY_REGEX );         \
        } else {                                                           \
            tmp = Perl_newSVpvf_nocontext( "%c", (int)uvc );               \
@@ -825,7 +814,7 @@ and would end up looking like:
 } STMT_END
 
 #define TRIE_LIST_NEW(state) STMT_START {                       \
-    Newz( 1023, trie->states[ state ].trans.list,               \
+    Newxz( trie->states[ state ].trans.list,               \
        4, reg_trie_trans_le );                                 \
      TRIE_LIST_CUR( state ) = 1;                                \
      TRIE_LIST_LEN( state ) = 4;                                \
@@ -857,10 +846,10 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 
     GET_RE_DEBUG_FLAGS_DECL;
 
-    Newz( 848200, trie, 1, reg_trie_data );
+    Newxz( trie, 1, reg_trie_data );
     trie->refcount = 1;
     RExC_rx->data->data[ data_slot ] = (void*)trie;
-    Newz( 848201, trie->charmap, 256, U16 );
+    Newxz( trie->charmap, 256, U16 );
     DEBUG_r({
         trie->words = newAV();
         trie->revcharmap = newAV();
@@ -899,7 +888,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
     for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
         regnode *noper = NEXTOPER( cur );
         const U8 *uc = (U8*)STRING( noper );
-        const U8 *e  = uc + STR_LEN( noper );
+        const U8 * const e  = uc + STR_LEN( noper );
         STRLEN foldlen = 0;
         U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
         const U8 *scan = (U8*)NULL;
@@ -935,7 +924,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
     DEBUG_TRIE_COMPILE_r(
         PerlIO_printf( Perl_debug_log, "TRIE(%s): W:%d C:%d Uq:%d \n",
                 ( trie->widecharmap ? "UTF8" : "NATIVE" ), trie->wordcount,
-                trie->charcount, trie->uniquecharcount )
+                (int)trie->charcount, trie->uniquecharcount )
     );
 
 
@@ -979,7 +968,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 
         STRLEN transcount = 1;
 
-        Newz( 848204, trie->states, trie->charcount + 2, reg_trie_state );
+        Newxz( trie->states, trie->charcount + 2, reg_trie_state );
         TRIE_LIST_NEW(1);
         next_alloc = 2;
 
@@ -987,7 +976,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 
         regnode *noper   = NEXTOPER( cur );
         U8 *uc           = (U8*)STRING( noper );
-        U8 *e            = uc + STR_LEN( noper );
+        const U8 * const e = uc + STR_LEN( noper );
         U32 state        = 1;         /* required init */
         U16 charid       = 0;         /* sanity init */
         U8 *scan         = (U8*)NULL; /* sanity init */
@@ -1024,14 +1013,13 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
                         newstate = TRIE_LIST_ITEM( state, check ).newstate;
                         break;
                     }
-                    }
-                    if ( ! newstate ) {
-                        newstate = next_alloc++;
-                        TRIE_LIST_PUSH( state, charid, newstate );
-                        transcount++;
-                    }
-                    state = newstate;
-
+               }
+               if ( ! newstate ) {
+                   newstate = next_alloc++;
+                   TRIE_LIST_PUSH( state, charid, newstate );
+                   transcount++;
+               }
+               state = newstate;
             } else {
                 Perl_croak( aTHX_ "panic! In trie construction, no char mapping for %"IVdf, uvc );
             }
@@ -1060,16 +1048,14 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 
         DEBUG_TRIE_COMPILE_MORE_r({
             U32 state;
-            U16 charid;
 
-            /*
-               print out the table precompression.
-             */
+            /* print out the table precompression.  */
 
             PerlIO_printf( Perl_debug_log, "\nState :Word | Transition Data\n" );
             PerlIO_printf( Perl_debug_log,   "------:-----+-----------------" );
 
             for( state=1 ; state < next_alloc ; state ++ ) {
+               U16 charid;
 
                 PerlIO_printf( Perl_debug_log, "\n %04"UVXf" :", (UV)state  );
                 if ( ! trie->states[ state ].wordnum ) {
@@ -1082,7 +1068,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
                 for( charid = 1 ; charid <= TRIE_LIST_USED( state ) ; charid++ ) {
                     SV **tmp = av_fetch( trie->revcharmap, TRIE_LIST_ITEM(state,charid).forid, 0);
                     PerlIO_printf( Perl_debug_log, "%s:%3X=%04"UVXf" | ",
-                        SvPV_nolen( *tmp ),
+                        SvPV_nolen_const( *tmp ),
                         TRIE_LIST_ITEM(state,charid).forid,
                         (UV)TRIE_LIST_ITEM(state,charid).newstate
                     );
@@ -1092,10 +1078,9 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
             PerlIO_printf( Perl_debug_log, "\n\n" );
         });
 
-        Newz( 848203, trie->trans, transcount ,reg_trie_trans );
+        Newxz( trie->trans, transcount ,reg_trie_trans );
         {
             U32 state;
-            U16 idx;
             U32 tp = 0;
             U32 zp = 0;
 
@@ -1112,7 +1097,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
                 if (trie->states[state].trans.list) {
                     U16 minid=TRIE_LIST_ITEM( state, 1).forid;
                     U16 maxid=minid;
-
+                   U16 idx;
 
                     for( idx = 2 ; idx <= TRIE_LIST_USED( state ) ; idx++ ) {
                         if ( TRIE_LIST_ITEM( state, idx).forid < minid ) {
@@ -1200,16 +1185,16 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 
         */
 
-        Newz( 848203, trie->trans, ( trie->charcount + 1 ) * trie->uniquecharcount + 1,
+        Newxz( trie->trans, ( trie->charcount + 1 ) * trie->uniquecharcount + 1,
               reg_trie_trans );
-        Newz( 848204, trie->states, trie->charcount + 2, reg_trie_state );
+        Newxz( trie->states, trie->charcount + 2, reg_trie_state );
         next_alloc = trie->uniquecharcount + 1;
 
         for ( cur = first ; cur < last ; cur = regnext( cur ) ) {
 
             regnode *noper   = NEXTOPER( cur );
-            U8 *uc           = (U8*)STRING( noper );
-            U8 *e            = uc + STR_LEN( noper );
+           const U8 *uc     = (U8*)STRING( noper );
+           const U8 * const e = uc + STR_LEN( noper );
 
             U32 state        = 1;         /* required init */
 
@@ -1280,7 +1265,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
             for( charid = 0 ; charid < trie->uniquecharcount ; charid++ ) {
                 SV **tmp = av_fetch( trie->revcharmap, charid, 0);
                 if ( tmp ) {
-                  PerlIO_printf( Perl_debug_log, "%4.4s ", SvPV_nolen( *tmp ) );
+                  PerlIO_printf( Perl_debug_log, "%4.4s ", SvPV_nolen_const( *tmp ) );
                 }
             }
 
@@ -1370,16 +1355,16 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 
            demq
         */
-        U32 laststate = TRIE_NODENUM( next_alloc );
-        U32 used , state, charid;
+        const U32 laststate = TRIE_NODENUM( next_alloc );
+       U32 state, charid;
         U32 pos = 0, zp=0;
         trie->laststate = laststate;
 
         for ( state = 1 ; state < laststate ; state++ ) {
             U8 flag = 0;
-            U32 stateidx = TRIE_NODEIDX( state );
-            U32 o_used=trie->trans[ stateidx ].check;
-            used = trie->trans[ stateidx ].check;
+           const U32 stateidx = TRIE_NODEIDX( state );
+           const U32 o_used = trie->trans[ stateidx ].check;
+           U32 used = trie->trans[ stateidx ].check;
             trie->trans[ stateidx ].check = 0;
 
             for ( charid = 0 ; used && charid < trie->uniquecharcount ; charid++ ) {
@@ -1414,7 +1399,9 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
         DEBUG_TRIE_COMPILE_MORE_r(
                 PerlIO_printf( Perl_debug_log,
                    " Alloc: %d Orig: %"IVdf" elements, Final:%"IVdf". Savings of %%%5.2f\n",
-                    ( ( trie->charcount + 1 ) * trie->uniquecharcount + 1 ), (IV)next_alloc, (IV)pos,
+                   (int)( ( trie->charcount + 1 ) * trie->uniquecharcount + 1 ),
+                   (IV)next_alloc,
+                   (IV)pos,
                     ( ( next_alloc - pos ) * 100 ) / (double)next_alloc );
             );
 
@@ -1435,7 +1422,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
         for( state = 0 ; state < trie->uniquecharcount ; state++ ) {
             SV **tmp = av_fetch( trie->revcharmap, state, 0);
             if ( tmp ) {
-              PerlIO_printf( Perl_debug_log, "%4.4s ", SvPV_nolen( *tmp ) );
+              PerlIO_printf( Perl_debug_log, "%4.4s ", SvPV_nolen_const( *tmp ) );
             }
         }
         PerlIO_printf( Perl_debug_log, "\n-----:-----------------------");
@@ -1445,7 +1432,7 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
         PerlIO_printf( Perl_debug_log, "\n");
 
         for( state = 1 ; state < trie->laststate ; state++ ) {
-            U32 base = trie->states[ state ].trans.base;
+           const U32 base = trie->states[ state ].trans.base;
 
             PerlIO_printf( Perl_debug_log, "#%04"UVXf" ", (UV)state);
 
@@ -1548,12 +1535,13 @@ S_make_trie(pTHX_ RExC_state_t *pRExC_state, regnode *startbranch, regnode *firs
 /* REx optimizer.  Converts nodes into quickier variants "in place".
    Finds fixed substrings.  */
 
-/* Stops at toplevel WHILEM as well as at `last'. At end *scanp is set
+/* Stops at toplevel WHILEM as well as at "last". At end *scanp is set
    to the position after last scanned or to NULL. */
 
 
 STATIC I32
-S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, regnode *last, scan_data_t *data, U32 flags, U32 depth)
+S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap,
+                       regnode *last, scan_data_t *data, U32 flags, U32 depth)
                        /* scanp: Start here (read-write). */
                        /* deltap: Write maxlen-minlen here. */
                        /* last: Stop before this one. */
@@ -1576,7 +1564,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
          SV *mysv=sv_newmortal();
          regprop( mysv, scan);
          PerlIO_printf(Perl_debug_log, "%*speep: %s (0x%08"UVXf")\n",
-           (int)depth*2, "", SvPV_nolen(mysv), PTR2UV(scan));
+           (int)depth*2, "", SvPV_nolen_const(mysv), PTR2UV(scan));
        });
 
        if (PL_regkind[(U8)OP(scan)] == EXACT) {
@@ -1606,7 +1594,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                    n = regnext(n);
                }
                else if (stringok) {
-                   int oldl = STR_LEN(scan);
+                   const int oldl = STR_LEN(scan);
                    regnode *nnext = regnext(n);
 
                    if (oldl + STR_LEN(n) > U8_MAX)
@@ -1654,8 +1642,8 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
 */
                 char *s0 = STRING(scan), *s, *t;
                 char *s1 = s0 + STR_LEN(scan) - 1, *s2 = s1 - 4;
-                 const char *t0 = "\xcc\x88\xcc\x81";
-                 const char *t1 = t0 + 3;
+                const char * const t0 = "\xcc\x88\xcc\x81";
+                const char * const t1 = t0 + 3;
 
                 for (s = s0 + 2;
                      s < s2 && (t = ninstr(s, s1, t0, t1));
@@ -1684,7 +1672,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
        /* Follow the next-chain of the current node and optimize
           away all the NOTHINGs from it.  */
        if (OP(scan) != CURLYX) {
-           int max = (reg_off_by_arg[OP(scan)]
+           const int max = (reg_off_by_arg[OP(scan)]
                       ? I32_MAX
                       /* I32 may be smaller than U16 on CRAYs! */
                       : (I32_MAX < U16_MAX ? I32_MAX : U16_MAX));
@@ -1870,7 +1858,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                         DEBUG_OPTIMISE_r({
                             regprop( mysv, tail );
                             PerlIO_printf( Perl_debug_log, "%*s%s%s%s\n",
-                                (int)depth * 2 + 2, "", "Tail node is:", SvPV_nolen( mysv ),
+                                (int)depth * 2 + 2, "", "Tail node is:", SvPV_nolen_const( mysv ),
                                 (RExC_seen_evals) ? "[EVAL]" : ""
                             );
                         });
@@ -1901,22 +1889,22 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
 
                         /* dont use tail as the end marker for this traverse */
                         for ( cur = startbranch ; cur != scan ; cur = regnext( cur ) ) {
-                            regnode *noper = NEXTOPER( cur );
-                            regnode *noper_next = regnext( noper );
+                            regnode * const noper = NEXTOPER( cur );
+                            regnode * const noper_next = regnext( noper );
 
                             DEBUG_OPTIMISE_r({
                                 regprop( mysv, cur);
                                 PerlIO_printf( Perl_debug_log, "%*s%s",
-                                   (int)depth * 2 + 2,"  ", SvPV_nolen( mysv ) );
+                                   (int)depth * 2 + 2,"  ", SvPV_nolen_const( mysv ) );
 
                                 regprop( mysv, noper);
                                 PerlIO_printf( Perl_debug_log, " -> %s",
-                                    SvPV_nolen(mysv));
+                                    SvPV_nolen_const(mysv));
 
                                 if ( noper_next ) {
                                   regprop( mysv, noper_next );
                                   PerlIO_printf( Perl_debug_log,"\t=> %s\t",
-                                    SvPV_nolen(mysv));
+                                    SvPV_nolen_const(mysv));
                                 }
                                 PerlIO_printf( Perl_debug_log, "0x%p,0x%p,0x%p)\n",
                                    first, last, cur );
@@ -1934,20 +1922,20 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                                         if (!last ) {
                                             regprop( mysv, first);
                                             PerlIO_printf( Perl_debug_log, "%*s%s",
-                                              (int)depth * 2 + 2, "F:", SvPV_nolen( mysv ) );
+                                              (int)depth * 2 + 2, "F:", SvPV_nolen_const( mysv ) );
                                             regprop( mysv, NEXTOPER(first) );
                                             PerlIO_printf( Perl_debug_log, " -> %s\n",
-                                              SvPV_nolen( mysv ) );
+                                              SvPV_nolen_const( mysv ) );
                                         }
                                     );
                                     last = cur;
                                     DEBUG_OPTIMISE_r({
                                         regprop( mysv, cur);
                                         PerlIO_printf( Perl_debug_log, "%*s%s",
-                                          (int)depth * 2 + 2, "N:", SvPV_nolen( mysv ) );
+                                          (int)depth * 2 + 2, "N:", SvPV_nolen_const( mysv ) );
                                         regprop( mysv, noper );
                                         PerlIO_printf( Perl_debug_log, " -> %s\n",
-                                          SvPV_nolen( mysv ) );
+                                          SvPV_nolen_const( mysv ) );
                                     });
                                 }
                             } else {
@@ -1976,7 +1964,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                             regprop( mysv, cur);
                             PerlIO_printf( Perl_debug_log,
                               "%*s%s\t(0x%p,0x%p,0x%p)\n", (int)depth * 2 + 2,
-                              "  ", SvPV_nolen( mysv ), first, last, cur);
+                              "  ", SvPV_nolen_const( mysv ), first, last, cur);
 
                         });
                         if ( last ) {
@@ -1999,7 +1987,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
            I32 l = STR_LEN(scan);
            UV uc = *((U8*)STRING(scan));
            if (UTF) {
-               U8 *s = (U8*)STRING(scan);
+               const U8 * const s = (U8*)STRING(scan);
                l = utf8_length(s, s + l);
                uc = utf8_to_uvchr(s, NULL);
            }
@@ -2014,8 +2002,8 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                }
                sv_catpvn(data->last_found, STRING(scan), STR_LEN(scan));
                {
-                   SV * sv = data->last_found;
-                   MAGIC *mg = SvUTF8(sv) && SvMAGICAL(sv) ?
+                   SV * const sv = data->last_found;
+                   MAGIC * const mg = SvUTF8(sv) && SvMAGICAL(sv) ?
                        mg_find(sv, PERL_MAGIC_utf8) : NULL;
                    if (mg && mg->mg_len >= 0)
                        mg->mg_len += utf8_length((U8*)STRING(scan),
@@ -2215,12 +2203,12 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                }
                if (!scan)              /* It was not CURLYX, but CURLY. */
                    scan = next;
-               if (ckWARN(WARN_REGEXP)
-                      /* ? quantifier ok, except for (?{ ... }) */
-                   && (next_is_eval || !(mincount == 0 && maxcount == 1))
+               if ( /* ? quantifier ok, except for (?{ ... }) */
+                   (next_is_eval || !(mincount == 0 && maxcount == 1))
                    && (minnext == 0) && (deltanext == 0)
                    && data && !(data->flags & (SF_HAS_PAR|SF_IN_PAR))
-                   && maxcount <= REG_INFTY/3) /* Complement check for big count */
+                   && maxcount <= REG_INFTY/3 /* Complement check for big count */
+                   && ckWARN(WARN_REGEXP))
                {
                    vWARN(RExC_parse,
                          "Quantifier unexpected on zero-length expression");
@@ -2353,7 +2341,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
 #if defined(SPARC64_GCC_WORKAROUND)
                        I32 b = 0;
                        STRLEN l = 0;
-                       char *s = NULL;
+                       const char *s = NULL;
                        I32 old = 0;
 
                        if (pos_before >= data->last_start_min)
@@ -2362,14 +2350,14 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                            b = data->last_start_min;
 
                        l = 0;
-                       s = SvPV(data->last_found, l);
+                       s = SvPV_const(data->last_found, l);
                        old = b - data->last_start_min;
 
 #else
                        I32 b = pos_before >= data->last_start_min
                            ? pos_before : data->last_start_min;
                        STRLEN l;
-                       char *s = SvPV(data->last_found, l);
+                       const char *s = SvPV_const(data->last_found, l);
                        I32 old = b - data->last_start_min;
 #endif
 
@@ -2386,7 +2374,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
                            if (mincount > 1) {
                                SvGROW(last_str, (mincount * l) + 1);
                                repeatcpy(SvPVX(last_str) + l,
-                                         SvPVX(last_str), l, mincount - 1);
+                                         SvPVX_const(last_str), l, mincount - 1);
                                SvCUR_set(last_str, SvCUR(last_str) * mincount);
                                /* Add additional parts. */
                                SvCUR_set(data->last_found,
@@ -2701,7 +2689,7 @@ S_study_chunk(pTHX_ RExC_state_t *pRExC_state, regnode **scanp, I32 *deltap, reg
            if (data)
                data->whilem_c = data_fake.whilem_c;
            if (f & SCF_DO_STCLASS_AND) {
-               int was = (data->start_class->flags & ANYOF_EOS);
+               const int was = (data->start_class->flags & ANYOF_EOS);
 
                cl_and(data->start_class, &intrnl);
                if (was)
@@ -2770,9 +2758,9 @@ S_add_data(pTHX_ RExC_state_t *pRExC_state, I32 n, const char *s)
        RExC_rx->data->count += n;
     }
     else {
-       Newc(1207, RExC_rx->data, sizeof(*RExC_rx->data) + sizeof(void*) * (n - 1),
+       Newxc(RExC_rx->data, sizeof(*RExC_rx->data) + sizeof(void*) * (n - 1),
             char, struct reg_data);
-       New(1208, RExC_rx->data->what, n, U8);
+       Newx(RExC_rx->data->what, n, U8);
        RExC_rx->data->count = n;
     }
     Copy(s, RExC_rx->data->what + RExC_rx->data->count - n, n, U8);
@@ -2782,21 +2770,22 @@ S_add_data(pTHX_ RExC_state_t *pRExC_state, I32 n, const char *s)
 void
 Perl_reginitcolors(pTHX)
 {
-    int i = 0;
-    char *s = PerlEnv_getenv("PERL_RE_COLORS");
-       
+    const char * const s = PerlEnv_getenv("PERL_RE_COLORS");
     if (s) {
-       PL_colors[0] = s = savepv(s);
+       char *t = savepv(s);
+       int i = 0;
+       PL_colors[0] = t;
        while (++i < 6) {
-           s = strchr(s, '\t');
-           if (s) {
-               *s = '\0';
-               PL_colors[i] = ++s;
+           t = strchr(t, '\t');
+           if (t) {
+               *t = '\0';
+               PL_colors[i] = ++t;
            }
            else
-               PL_colors[i] = s = (char *)"";
+               PL_colors[i] = t = (char *)"";
        }
     } else {
+       int i = 0;
        while (i < 6)
            PL_colors[i++] = (char *)"";
     }
@@ -2884,7 +2873,7 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
        RExC_whilem_seen = 15;
 
     /* Allocate space and initialize. */
-    Newc(1001, r, sizeof(regexp) + (unsigned)RExC_size * sizeof(regnode),
+    Newxc(r, sizeof(regexp) + (unsigned)RExC_size * sizeof(regnode),
         char, regexp);
     if (r == NULL)
        FAIL("Regexp out of space");
@@ -2897,7 +2886,7 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
     r->prelen = xend - exp;
     r->precomp = savepvn(RExC_precomp, r->prelen);
     r->subbeg = NULL;
-#ifdef PERL_COPY_ON_WRITE
+#ifdef PERL_OLD_COPY_ON_WRITE
     r->saved_copy = Nullsv;
 #endif
     r->reganch = pm->op_pmflags & PMf_COMPILETIME;
@@ -2907,7 +2896,7 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
     r->startp = 0;                     /* Useful during FAIL. */
     r->endp = 0;                       /* Useful during FAIL. */
 
-    Newz(1304, r->offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
+    Newxz(r->offsets, 2*RExC_size+1, U32); /* MJD 20001228 */
     if (r->offsets) {
        r->offsets[0] = RExC_size;
     }
@@ -2946,7 +2935,7 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
 
     /* XXXX To minimize changes to RE engine we always allocate
        3-units-long substrs field. */
-    Newz(1004, r->substrs, 1, struct reg_substr_data);
+    Newxz(r->substrs, 1, struct reg_substr_data);
 
     StructCopy(&zero_scan_data, &data, scan_data_t);
     /* XXXX Should not we check for something else?  Usually it is OPEN1... */
@@ -3005,13 +2994,10 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
            !(r->reganch & ROPT_ANCH) )
        {
            /* turn .* into ^.* with an implied $*=1 */
-           int type = OP(NEXTOPER(first));
-
-           if (type == REG_ANY)
-               type = ROPT_ANCH_MBOL;
-           else
-               type = ROPT_ANCH_SBOL;
-
+           const int type =
+               (OP(NEXTOPER(first)) == REG_ANY)
+                   ? ROPT_ANCH_MBOL
+                   : ROPT_ANCH_SBOL;
            r->reganch |= type | ROPT_IMPLICIT;
            first = NEXTOPER(first);
            goto again;
@@ -3126,9 +3112,9 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
            && !(data.start_class->flags & ANYOF_EOS)
            && !cl_is_anything(data.start_class))
        {
-           I32 n = add_data(pRExC_state, 1, "f");
+           const I32 n = add_data(pRExC_state, 1, "f");
 
-           New(1006, RExC_rx->data->data[n], 1,
+           Newx(RExC_rx->data->data[n], 1,
                struct regnode_charclass_class);
            StructCopy(data.start_class,
                       (struct regnode_charclass_class*)RExC_rx->data->data[n],
@@ -3139,8 +3125,8 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
            DEBUG_COMPILE_r({ SV *sv = sv_newmortal();
                      regprop(sv, (regnode*)data.start_class);
                      PerlIO_printf(Perl_debug_log,
-                                   "synthetic stclass `%s'.\n",
-                                   SvPVX(sv));});
+                                   "synthetic stclass \"%s\".\n",
+                                   SvPVX_const(sv));});
        }
 
        /* A temporary algorithm prefers floated substr to fixed one to dig more info. */
@@ -3182,9 +3168,9 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
        if (!(data.start_class->flags & ANYOF_EOS)
            && !cl_is_anything(data.start_class))
        {
-           I32 n = add_data(pRExC_state, 1, "f");
+           const I32 n = add_data(pRExC_state, 1, "f");
 
-           New(1006, RExC_rx->data->data[n], 1,
+           Newx(RExC_rx->data->data[n], 1,
                struct regnode_charclass_class);
            StructCopy(data.start_class,
                       (struct regnode_charclass_class*)RExC_rx->data->data[n],
@@ -3194,8 +3180,8 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
            DEBUG_COMPILE_r({ SV* sv = sv_newmortal();
                      regprop(sv, (regnode*)data.start_class);
                      PerlIO_printf(Perl_debug_log,
-                                   "synthetic stclass `%s'.\n",
-                                   SvPVX(sv));});
+                                   "synthetic stclass \"%s\".\n",
+                                   SvPVX_const(sv));});
        }
     }
 
@@ -3208,8 +3194,8 @@ Perl_pregcomp(pTHX_ char *exp, char *xend, PMOP *pm)
        r->reganch |= ROPT_EVAL_SEEN;
     if (RExC_seen & REG_SEEN_CANY)
        r->reganch |= ROPT_CANY_SEEN;
-    Newz(1002, r->startp, RExC_npar, I32);
-    Newz(1002, r->endp, RExC_npar, I32);
+    Newxz(r->startp, RExC_npar, I32);
+    Newxz(r->endp, RExC_npar, I32);
     PL_regdata = r->data; /* for regprop() */
     DEBUG_COMPILE_r(regdump(r));
     return(r);
@@ -3246,7 +3232,7 @@ S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp)
         wasted_c    = 0x04;
 
     char * parse_start = RExC_parse; /* MJD */
-    char *oregcomp_parse = RExC_parse;
+    char * const oregcomp_parse = RExC_parse;
     char c;
 
     *flagp = 0;                                /* Tentatively. */
@@ -3258,7 +3244,7 @@ S_reg(pTHX_ RExC_state_t *pRExC_state, I32 paren, I32 *flagp)
            U32 posflags = 0, negflags = 0;
            U32 *flagsp = &posflags;
            int logical = 0;
-           char *seqstart = RExC_parse;
+           const char * const seqstart = RExC_parse;
 
            RExC_parse++;
            paren = *RExC_parse++;
@@ -3712,7 +3698,7 @@ S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp)
     register char op;
     register char *next;
     I32 flags;
-    char *origparse = RExC_parse;
+    const char * const origparse = RExC_parse;
     char *maxpos;
     I32 min;
     I32 max = REG_INFTY;
@@ -3853,7 +3839,7 @@ S_regpiece(pTHX_ RExC_state_t *pRExC_state, I32 *flagp)
        goto do_curly;
     }
   nest_check:
-    if (ckWARN(WARN_REGEXP) && !SIZE_ONLY && !(flags&HASWIDTH) && max > REG_INFTY/3) {
+    if (!SIZE_ONLY && !(flags&HASWIDTH) && max > REG_INFTY/3 && ckWARN(WARN_REGEXP)) {
        vWARN3(RExC_parse,
               "%.*s matches null string many times",
               RExC_parse - origparse,
@@ -4118,7 +4104,7 @@ tryagain:
        case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
            {
-               I32 num = atoi(RExC_parse);
+               const I32 num = atoi(RExC_parse);
 
                if (num > 9 && num >= RExC_npar)
                    goto defchar;
@@ -4148,7 +4134,7 @@ tryagain:
                FAIL("Trailing \\");
            /* FALL THROUGH */
        default:
-           /* Do not generate `unrecognized' warnings here, we fall
+           /* Do not generate "unrecognized" warnings here, we fall
               back into the quick-grab loop below */
            parse_start--;
            goto defchar;
@@ -4168,7 +4154,6 @@ tryagain:
            register UV ender;
            register char *p;
            char *oldp, *s;
-           STRLEN numlen;
            STRLEN foldlen;
            U8 tmpbuf[UTF8_MAXBYTES_CASE+1], *foldbuf;
 
@@ -4244,7 +4229,7 @@ tryagain:
                        break;
                    case 'x':
                        if (*++p == '{') {
-                           char* e = strchr(p, '}');
+                           char* const e = strchr(p, '}');
        
                            if (!e) {
                                RExC_parse = p + 1;
@@ -4253,7 +4238,7 @@ tryagain:
                            else {
                                 I32 flags = PERL_SCAN_ALLOW_UNDERSCORES
                                     | PERL_SCAN_DISALLOW_PREFIX;
-                                numlen = e - p - 1;
+                                STRLEN numlen = e - p - 1;
                                ender = grok_hex(p + 1, &numlen, &flags, NULL);
                                if (ender > 0xff)
                                    RExC_utf8 = 1;
@@ -4262,7 +4247,7 @@ tryagain:
                        }
                        else {
                             I32 flags = PERL_SCAN_DISALLOW_PREFIX;
-                           numlen = 2;
+                           STRLEN numlen = 2;
                            ender = grok_hex(p, &numlen, &flags, NULL);
                            p += numlen;
                        }
@@ -4277,7 +4262,7 @@ tryagain:
                        if (*p == '0' ||
                          (isDIGIT(p[1]) && atoi(p) >= RExC_npar) ) {
                             I32 flags = 0;
-                           numlen = 3;
+                           STRLEN numlen = 3;
                            ender = grok_oct(p, &numlen, &flags, NULL);
                            p += numlen;
                        }
@@ -4291,7 +4276,7 @@ tryagain:
                            FAIL("Trailing \\");
                        /* FALL THROUGH */
                    default:
-                       if (!SIZE_ONLY && ckWARN(WARN_REGEXP) && isALPHA(*p))
+                       if (!SIZE_ONLY&& isALPHA(*p) && ckWARN(WARN_REGEXP))
                            vWARN2(p + 1, "Unrecognized escape \\%c passed through", UCHARAT(p));
                        goto normal_default;
                    }
@@ -4299,6 +4284,7 @@ tryagain:
                default:
                  normal_default:
                    if (UTF8_IS_START(*p) && UTF) {
+                       STRLEN numlen;
                        ender = utf8n_to_uvchr((U8*)p, RExC_end - p,
                                               &numlen, 0);
                        p += numlen;
@@ -4321,6 +4307,7 @@ tryagain:
 
                         if (FOLD) {
                              /* Emit all the Unicode characters. */
+                             STRLEN numlen;
                              for (foldbuf = tmpbuf;
                                   foldlen;
                                   foldlen -= numlen) {
@@ -4358,6 +4345,7 @@ tryagain:
 
                     if (FOLD) {
                          /* Emit all the Unicode characters. */
+                         STRLEN numlen;
                          for (foldbuf = tmpbuf;
                               foldlen;
                               foldlen -= numlen) {
@@ -4421,8 +4409,8 @@ tryagain:
        if (RExC_utf8)
            SvUTF8_on(sv);
        if (sv_utf8_downgrade(sv, TRUE)) {
-           char *s       = sv_recode_to_utf8(sv, PL_encoding);
-           STRLEN newlen = SvCUR(sv);
+           const char * const s = sv_recode_to_utf8(sv, PL_encoding);
+           const STRLEN newlen = SvCUR(sv);
 
            if (SvUTF8(sv))
                RExC_utf8 = 1;
@@ -4443,7 +4431,7 @@ tryagain:
 }
 
 STATIC char *
-S_regwhite(pTHX_ char *p, char *e)
+S_regwhite(pTHX_ char *p, const char *e)
 {
     while (p < e) {
        if (isSPACE(*p))
@@ -4472,13 +4460,12 @@ S_regwhite(pTHX_ char *p, char *e)
 STATIC I32
 S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
 {
-    char *posixcc = 0;
     I32 namedclass = OOB_NAMEDCLASS;
 
     if (value == '[' && RExC_parse + 1 < RExC_end &&
        /* I smell either [: or [= or [. -- POSIX has been here, right? */
        POSIXCC(UCHARAT(RExC_parse))) {
-       char  c = UCHARAT(RExC_parse);
+       const char c = UCHARAT(RExC_parse);
        char* s = RExC_parse++;
        
        while (RExC_parse < RExC_end && UCHARAT(RExC_parse) != c)
@@ -4487,7 +4474,8 @@ S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
            /* Grandfather lone [:, [=, [. */
            RExC_parse = s;
        else {
-           char* t = RExC_parse++; /* skip over the c */
+           const char* t = RExC_parse++; /* skip over the c */
+           const char *posixcc;
 
            assert(*t == c);
 
@@ -4495,8 +4483,8 @@ S_regpposixcc(pTHX_ RExC_state_t *pRExC_state, I32 value)
                RExC_parse++; /* skip over the ending ] */
                posixcc = s + 1;
                if (*s == ':') {
-                   I32 complement = *posixcc == '^' ? *posixcc++ : 0;
-                   I32 skip = t - posixcc;
+                   const I32 complement = *posixcc == '^' ? *posixcc++ : 0;
+                   const I32 skip = t - posixcc;
 
                    /* Initially switch on the length of the name.  */
                    switch (skip) {
@@ -4632,8 +4620,8 @@ STATIC void
 S_checkposixcc(pTHX_ RExC_state_t *pRExC_state)
 {
     if (!SIZE_ONLY && POSIXCC(UCHARAT(RExC_parse))) {
-       char *s = RExC_parse;
-       char  c = *s++;
+       const char *s = RExC_parse;
+       const char  c = *s++;
 
        while(*s && isALNUM(*s))
            s++;
@@ -4754,7 +4742,7 @@ S_regclass(pTHX_ RExC_state_t *pRExC_state)
                if (RExC_parse >= RExC_end)
                    vFAIL2("Empty \\%c{}", (U8)value);
                if (*RExC_parse == '{') {
-                   U8 c = (U8)value;
+                   const U8 c = (U8)value;
                    e = strchr(RExC_parse++, '}');
                     if (!e)
                         vFAIL2("Missing right brace on \\%c{}", c);
@@ -4831,7 +4819,7 @@ S_regclass(pTHX_ RExC_state_t *pRExC_state)
                break;
             }
            default:
-               if (!SIZE_ONLY && ckWARN(WARN_REGEXP) && isALPHA(value))
+               if (!SIZE_ONLY && isALPHA(value) && ckWARN(WARN_REGEXP))
                    vWARN2(RExC_parse,
                           "Unrecognized escape \\%c in character class passed through",
                           (int)value);
@@ -5281,7 +5269,7 @@ S_regclass(pTHX_ RExC_state_t *pRExC_state)
            IV i;
 
            if (prevvalue < 256) {
-               IV ceilvalue = value < 256 ? value : 255;
+               const IV ceilvalue = value < 256 ? value : 255;
 
 #ifdef EBCDIC
                /* In EBCDIC [\x89-\x91] should include
@@ -5306,8 +5294,8 @@ S_regclass(pTHX_ RExC_state_t *pRExC_state)
                          ANYOF_BITMAP_SET(ret, i);
          }
          if (value > 255 || UTF) {
-               UV prevnatvalue  = NATIVE_TO_UNI(prevvalue);
-               UV natvalue      = NATIVE_TO_UNI(value);
+               const UV prevnatvalue  = NATIVE_TO_UNI(prevvalue);
+               const UV natvalue      = NATIVE_TO_UNI(value);
 
                ANYOF_FLAGS(ret) |= ANYOF_UNICODE;
                if (prevnatvalue < natvalue) { /* what about > ? */
@@ -5319,7 +5307,7 @@ S_regclass(pTHX_ RExC_state_t *pRExC_state)
                    if (FOLD) {
                         U8 foldbuf[UTF8_MAXBYTES_CASE+1];
                         STRLEN foldlen;
-                        UV f = to_uni_fold(natvalue, foldbuf, &foldlen);
+                        const UV f = to_uni_fold(natvalue, foldbuf, &foldlen);
 
                         /* If folding and foldable and a single
                          * character, insert also the folded version
@@ -5468,10 +5456,9 @@ S_nextchar(pTHX_ RExC_state_t *pRExC_state)
 STATIC regnode *                       /* Location. */
 S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
 {
-    register regnode *ret;
     register regnode *ptr;
+    regnode * const ret = RExC_emit;
 
-    ret = RExC_emit;
     if (SIZE_ONLY) {
        SIZE_ALIGN(RExC_size);
        RExC_size += 1;
@@ -5504,10 +5491,9 @@ S_reg_node(pTHX_ RExC_state_t *pRExC_state, U8 op)
 STATIC regnode *                       /* Location. */
 S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
 {
-    register regnode *ret;
     register regnode *ptr;
+    regnode * const ret = RExC_emit;
 
-    ret = RExC_emit;
     if (SIZE_ONLY) {
        SIZE_ALIGN(RExC_size);
        RExC_size += 2;
@@ -5539,7 +5525,7 @@ S_reganode(pTHX_ RExC_state_t *pRExC_state, U8 op, U32 arg)
 - reguni - emit (if appropriate) a Unicode character
 */
 STATIC void
-S_reguni(pTHX_ RExC_state_t *pRExC_state, UV uv, char* s, STRLEN* lenp)
+S_reguni(pTHX_ const RExC_state_t *pRExC_state, UV uv, char* s, STRLEN* lenp)
 {
     *lenp = SIZE_ONLY ? UNISKIP(uv) : (uvchr_to_utf8((U8*)s, uv) - (U8*)s);
 }
@@ -5555,7 +5541,7 @@ S_reginsert(pTHX_ RExC_state_t *pRExC_state, U8 op, regnode *opnd)
     register regnode *src;
     register regnode *dst;
     register regnode *place;
-    register int offset = regarglen[(U8)op];
+    const int offset = regarglen[(U8)op];
 
 /* (PL_regkind[(U8)op] == CURLY ? EXTRA_STEP_2ARGS : 0); */
 
@@ -5611,7 +5597,6 @@ STATIC void
 S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p, regnode *val)
 {
     register regnode *scan;
-    register regnode *temp;
 
     if (SIZE_ONLY)
        return;
@@ -5619,7 +5604,7 @@ S_regtail(pTHX_ RExC_state_t *pRExC_state, regnode *p, regnode *val)
     /* Find last node. */
     scan = p;
     for (;;) {
-       temp = regnext(scan);
+       regnode * const temp = regnext(scan);
        if (temp == NULL)
            break;
        scan = temp;
@@ -5656,7 +5641,7 @@ S_regoptail(pTHX_ RExC_state_t *pRExC_state, regnode *p, regnode *val)
  - regcurly - a little FSA that accepts {\d+,?\d*}
  */
 STATIC I32
-S_regcurly(pTHX_ register char *s)
+S_regcurly(pTHX_ register const char *s)
 {
     if (*s++ != '{')
        return FALSE;
@@ -5674,118 +5659,6 @@ S_regcurly(pTHX_ register char *s)
 }
 
 
-#ifdef DEBUGGING
-
-STATIC regnode *
-S_dumpuntil(pTHX_ regnode *start, regnode *node, regnode *last, SV* sv, I32 l)
-{
-    register U8 op = EXACT;    /* Arbitrary non-END op. */
-    register regnode *next;
-
-    while (op != END && (!last || node < last)) {
-       /* While that wasn't END last time... */
-
-       NODE_ALIGN(node);
-       op = OP(node);
-       if (op == CLOSE)
-           l--;        
-       next = regnext(node);
-       /* Where, what. */
-       if (OP(node) == OPTIMIZED)
-           goto after_print;
-       regprop(sv, node);
-       PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
-                     (int)(2*l + 1), "", SvPVX(sv));
-       if (next == NULL)               /* Next ptr. */
-           PerlIO_printf(Perl_debug_log, "(0)");
-       else
-           PerlIO_printf(Perl_debug_log, "(%"IVdf")", (IV)(next - start));
-       (void)PerlIO_putc(Perl_debug_log, '\n');
-      after_print:
-       if (PL_regkind[(U8)op] == BRANCHJ) {
-           register regnode *nnode = (OP(next) == LONGJMP
-                                      ? regnext(next)
-                                      : next);
-           if (last && nnode > last)
-               nnode = last;
-           node = dumpuntil(start, NEXTOPER(NEXTOPER(node)), nnode, sv, l + 1);
-       }
-       else if (PL_regkind[(U8)op] == BRANCH) {
-           node = dumpuntil(start, NEXTOPER(node), next, sv, l + 1);
-       }
-       else if ( PL_regkind[(U8)op]  == TRIE ) {
-            const I32 n = ARG(node);
-            const reg_trie_data *trie = (reg_trie_data*)PL_regdata->data[n];
-            const I32 arry_len = av_len(trie->words)+1;
-           I32 word_idx;
-           PerlIO_printf(Perl_debug_log,
-                      "%*s[Words:%d Chars Stored:%d Unique Chars:%d States:%"IVdf"%s]\n",
-                      (int)(2*(l+3)), "",
-                      trie->wordcount,
-                      trie->charcount,
-                      trie->uniquecharcount,
-                      (IV)trie->laststate-1,
-                      node->flags ? " EVAL mode" : "");
-
-           for (word_idx=0; word_idx < arry_len; word_idx++) {
-               SV **elem_ptr=av_fetch(trie->words,word_idx,0);
-               if (elem_ptr) {
-                   PerlIO_printf(Perl_debug_log, "%*s<%s%s%s>\n",
-                      (int)(2*(l+4)), "",
-                      PL_colors[0],
-                      SvPV_nolen(*elem_ptr),
-                      PL_colors[1]
-                   );
-                   /*
-                   if (next == NULL)
-                       PerlIO_printf(Perl_debug_log, "(0)\n");
-                   else
-                       PerlIO_printf(Perl_debug_log, "(%"IVdf")\n", (IV)(next - start));
-                   */
-               }
-
-           }
-
-           node = NEXTOPER(node);
-           node += regarglen[(U8)op];
-
-       }
-       else if ( op == CURLY) {   /* `next' might be very big: optimizer */
-           node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS,
-                            NEXTOPER(node) + EXTRA_STEP_2ARGS + 1, sv, l + 1);
-       }
-       else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
-           node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS,
-                            next, sv, l + 1);
-       }
-       else if ( op == PLUS || op == STAR) {
-           node = dumpuntil(start, NEXTOPER(node), NEXTOPER(node) + 1, sv, l + 1);
-       }
-       else if (op == ANYOF) {
-           /* arglen 1 + class block */
-           node += 1 + ((ANYOF_FLAGS(node) & ANYOF_LARGE)
-                   ? ANYOF_CLASS_SKIP : ANYOF_SKIP);
-           node = NEXTOPER(node);
-       }
-       else if (PL_regkind[(U8)op] == EXACT) {
-            /* Literal string, where present. */
-           node += NODE_SZ_STR(node) - 1;
-           node = NEXTOPER(node);
-       }
-       else {
-           node = NEXTOPER(node);
-           node += regarglen[(U8)op];
-       }
-       if (op == CURLYX || op == OPEN)
-           l++;
-       else if (op == WHILEM)
-           l--;
-    }
-    return node;
-}
-
-#endif /* DEBUGGING */
-
 /*
  - regdump - dump a regexp onto Perl_debug_log in vaguely comprehensible form
  */
@@ -5800,37 +5673,37 @@ Perl_regdump(pTHX_ regexp *r)
     /* Header fields of interest. */
     if (r->anchored_substr)
        PerlIO_printf(Perl_debug_log,
-                     "anchored `%s%.*s%s'%s at %"IVdf" ",
+                     "anchored \"%s%.*s%s\"%s at %"IVdf" ",
                      PL_colors[0],
                      (int)(SvCUR(r->anchored_substr) - (SvTAIL(r->anchored_substr)!=0)),
-                     SvPVX(r->anchored_substr),
+                     SvPVX_const(r->anchored_substr),
                      PL_colors[1],
                      SvTAIL(r->anchored_substr) ? "$" : "",
                      (IV)r->anchored_offset);
     else if (r->anchored_utf8)
        PerlIO_printf(Perl_debug_log,
-                     "anchored utf8 `%s%.*s%s'%s at %"IVdf" ",
+                     "anchored utf8 \"%s%.*s%s\"%s at %"IVdf" ",
                      PL_colors[0],
                      (int)(SvCUR(r->anchored_utf8) - (SvTAIL(r->anchored_utf8)!=0)),
-                     SvPVX(r->anchored_utf8),
+                     SvPVX_const(r->anchored_utf8),
                      PL_colors[1],
                      SvTAIL(r->anchored_utf8) ? "$" : "",
                      (IV)r->anchored_offset);
     if (r->float_substr)
        PerlIO_printf(Perl_debug_log,
-                     "floating `%s%.*s%s'%s at %"IVdf"..%"UVuf" ",
+                     "floating \"%s%.*s%s\"%s at %"IVdf"..%"UVuf" ",
                      PL_colors[0],
                      (int)(SvCUR(r->float_substr) - (SvTAIL(r->float_substr)!=0)),
-                     SvPVX(r->float_substr),
+                     SvPVX_const(r->float_substr),
                      PL_colors[1],
                      SvTAIL(r->float_substr) ? "$" : "",
                      (IV)r->float_min_offset, (UV)r->float_max_offset);
     else if (r->float_utf8)
        PerlIO_printf(Perl_debug_log,
-                     "floating utf8 `%s%.*s%s'%s at %"IVdf"..%"UVuf" ",
+                     "floating utf8 \"%s%.*s%s\"%s at %"IVdf"..%"UVuf" ",
                      PL_colors[0],
                      (int)(SvCUR(r->float_utf8) - (SvTAIL(r->float_utf8)!=0)),
-                     SvPVX(r->float_utf8),
+                     SvPVX_const(r->float_utf8),
                      PL_colors[1],
                      SvTAIL(r->float_utf8) ? "$" : "",
                      (IV)r->float_min_offset, (UV)r->float_max_offset);
@@ -5848,7 +5721,7 @@ Perl_regdump(pTHX_ regexp *r)
 
     if (r->regstclass) {
        regprop(sv, r->regstclass);
-       PerlIO_printf(Perl_debug_log, "stclass `%s' ", SvPVX(sv));
+       PerlIO_printf(Perl_debug_log, "stclass \"%s\" ", SvPVX_const(sv));
     }
     if (r->reganch & ROPT_ANCH) {
        PerlIO_printf(Perl_debug_log, "anchored");
@@ -5873,10 +5746,10 @@ Perl_regdump(pTHX_ regexp *r)
        PerlIO_printf(Perl_debug_log, "with eval ");
     PerlIO_printf(Perl_debug_log, "\n");
     if (r->offsets) {
-        U32 i;
         const U32 len = r->offsets[0];
         GET_RE_DEBUG_FLAGS_DECL;
         DEBUG_OFFSETS_r({
+           U32 i;
            PerlIO_printf(Perl_debug_log, "Offsets: [%"UVuf"]\n\t", (UV)r->offsets[0]);
            for (i = 1; i <= len; i++)
                PerlIO_printf(Perl_debug_log, "%"UVuf"[%"UVuf"] ", 
@@ -5887,27 +5760,11 @@ Perl_regdump(pTHX_ regexp *r)
 #endif /* DEBUGGING */
 }
 
-#ifdef DEBUGGING
-
-STATIC void
-S_put_byte(pTHX_ SV *sv, int c)
-{
-    if (isCNTRL(c) || c == 255 || !isPRINT(c))
-       Perl_sv_catpvf(aTHX_ sv, "\\%o", c);
-    else if (c == '-' || c == ']' || c == '\\' || c == '^')
-       Perl_sv_catpvf(aTHX_ sv, "\\%c", c);
-    else
-       Perl_sv_catpvf(aTHX_ sv, "%c", c);
-}
-
-#endif /* DEBUGGING */
-
-
 /*
 - regprop - printable representation of opcode
 */
 void
-Perl_regprop(pTHX_ SV *sv, regnode *o)
+Perl_regprop(pTHX_ SV *sv, const regnode *o)
 {
 #ifdef DEBUGGING
     register int k;
@@ -5922,12 +5779,12 @@ Perl_regprop(pTHX_ SV *sv, regnode *o)
     k = PL_regkind[(U8)OP(o)];
 
     if (k == EXACT) {
-        SV *dsv = sv_2mortal(newSVpvn("", 0));
+       SV * const dsv = sv_2mortal(newSVpvn("", 0));
        /* Using is_utf8_string() is a crude hack but it may
         * be the best for now since we have no flag "this EXACTish
         * node was UTF-8" --jhi */
-       bool do_utf8 = is_utf8_string((U8*)STRING(o), STR_LEN(o));
-       char *s    = do_utf8 ?
+       const bool do_utf8 = is_utf8_string((U8*)STRING(o), STR_LEN(o));
+       const char * const s = do_utf8 ?
          pv_uni_display(dsv, (U8*)STRING(o), STR_LEN(o), 60,
                         UNI_DISPLAY_REGEX) :
          STRING(o);
@@ -5962,7 +5819,7 @@ Perl_regprop(pTHX_ SV *sv, regnode *o)
        Perl_sv_catpvf(aTHX_ sv, "[%d]", o->flags);     /* 2: embedded, otherwise 1 */
     else if (k == ANYOF) {
        int i, rangestart = -1;
-       U8 flags = ANYOF_FLAGS(o);
+       const U8 flags = ANYOF_FLAGS(o);
        const char * const anyofs[] = { /* Should be synchronized with
                                         * ANYOF_ #xdefines in regcomp.h */
            "\\w",
@@ -6033,32 +5890,35 @@ Perl_regprop(pTHX_ SV *sv, regnode *o)
 
        {
            SV *lv;
-           SV *sw = regclass_swash(o, FALSE, &lv, 0);
+           SV * const sw = regclass_swash(o, FALSE, &lv, 0);
        
            if (lv) {
                if (sw) {
                    U8 s[UTF8_MAXBYTES_CASE+1];
                
                    for (i = 0; i <= 256; i++) { /* just the first 256 */
-                       U8 *e = uvchr_to_utf8(s, i);
+                       uvchr_to_utf8(s, i);
                        
                        if (i < 256 && swash_fetch(sw, s, TRUE)) {
                            if (rangestart == -1)
                                rangestart = i;
                        } else if (rangestart != -1) {
-                           U8 *p;
-                       
                            if (i <= rangestart + 3)
                                for (; rangestart < i; rangestart++) {
-                                   for(e = uvchr_to_utf8(s, rangestart), p = s; p < e; p++)
+                                   const U8 * const e = uvchr_to_utf8(s,rangestart);
+                                   U8 *p;
+                                   for(p = s; p < e; p++)
                                        put_byte(sv, *p);
                                }
                            else {
-                               for (e = uvchr_to_utf8(s, rangestart), p = s; p < e; p++)
+                               const U8 *e = uvchr_to_utf8(s,rangestart);
+                               U8 *p;
+                               for (p = s; p < e; p++)
+                                   put_byte(sv, *p);
+                               sv_catpvn(sv, "-", 1);
+                               e = uvchr_to_utf8(s, i-1);
+                               for (p = s; p < e; p++)
                                    put_byte(sv, *p);
-                               sv_catpv(sv, "-");
-                                   for (e = uvchr_to_utf8(s, i - 1), p = s; p < e; p++)
-                                       put_byte(sv, *p);
                                }
                                rangestart = -1;
                            }
@@ -6074,7 +5934,7 @@ Perl_regprop(pTHX_ SV *sv, regnode *o)
                    while(*s && *s != '\n') s++;
                
                    if (*s == '\n') {
-                       char *t = ++s;
+                       const char * const t = ++s;
                        
                        while (*s) {
                            if (*s == '\n')
@@ -6104,13 +5964,13 @@ Perl_re_intuit_string(pTHX_ regexp *prog)
 {                              /* Assume that RE_INTUIT is set */
     GET_RE_DEBUG_FLAGS_DECL;
     DEBUG_COMPILE_r(
-       {   STRLEN n_a;
-           char *s = SvPV(prog->check_substr
-                     ? prog->check_substr : prog->check_utf8, n_a);
+       {
+           const char * const s = SvPV_nolen_const(prog->check_substr
+                     ? prog->check_substr : prog->check_utf8);
 
            if (!PL_colorset) reginitcolors();
            PerlIO_printf(Perl_debug_log,
-                     "%sUsing REx %ssubstr:%s `%s%.60s%s%s'\n",
+                     "%sUsing REx %ssubstr:%s \"%s%.60s%s%s\"\n",
                      PL_colors[4],
                      prog->check_substr ? "" : "utf8 ",
                      PL_colors[5],PL_colors[0],
@@ -6149,12 +6009,12 @@ Perl_pregfree(pTHX_ struct regexp *r)
                       len > 60 ? "..." : "");
     });
 
-    if (r->precomp)
-       Safefree(r->precomp);
-    if (r->offsets)             /* 20010421 MJD */
-       Safefree(r->offsets);
+    /* gcov results gave these as non-null 100% of the time, so there's no
+       optimisation in checking them before calling Safefree  */
+    Safefree(r->precomp);
+    Safefree(r->offsets);             /* 20010421 MJD */
     RX_MATCH_COPY_FREE(r);
-#ifdef PERL_COPY_ON_WRITE
+#ifdef PERL_OLD_COPY_ON_WRITE
     if (r->saved_copy)
        SvREFCNT_dec(r->saved_copy);
 #endif
@@ -6212,17 +6072,14 @@ Perl_pregfree(pTHX_ struct regexp *r)
                        reg_trie_data *trie=(reg_trie_data*)r->data->data[n];
                        U32 refcount;
                        OP_REFCNT_LOCK;
-                       refcount = trie->refcount--;
+                       refcount = --trie->refcount;
                        OP_REFCNT_UNLOCK;
                        if ( !refcount ) {
-                           if (trie->charmap)
-                               Safefree(trie->charmap);
+                           Safefree(trie->charmap);
                            if (trie->widecharmap)
                                SvREFCNT_dec((SV*)trie->widecharmap);
-                           if (trie->states)
-                               Safefree(trie->states);
-                           if (trie->trans)
-                               Safefree(trie->trans);
+                           Safefree(trie->states);
+                           Safefree(trie->trans);
 #ifdef DEBUGGING
                            if (trie->words)
                                SvREFCNT_dec((SV*)trie->words);
@@ -6289,7 +6146,7 @@ S_re_croak2(pTHX_ const char* pat1,const char* pat2,...)
 #endif
     msv = vmess(buf, &args);
     va_end(args);
-    message = SvPV(msv,l1);
+    message = SvPV_const(msv,l1);
     if (l1 > 512)
        l1 = 512;
     Copy(message, buf, l1 , char);
@@ -6336,7 +6193,7 @@ Perl_save_re_context(pTHX)
     PL_reg_oldsaved = Nullch;
     SAVEI32(PL_reg_oldsavedlen);       /* old length of saved substr during match */
     PL_reg_oldsavedlen = 0;
-#ifdef PERL_COPY_ON_WRITE
+#ifdef PERL_OLD_COPY_ON_WRITE
     SAVESPTR(PL_nrs);
     PL_nrs = Nullsv;
 #endif
@@ -6354,15 +6211,15 @@ Perl_save_re_context(pTHX)
 
     {
        /* Save $1..$n (#18107: UTF-8 s/(\w+)/uc($1)/e); AMS 20021106. */
-       U32 i;
-       GV *mgv;
        REGEXP *rx;
-       char digits[TYPE_CHARS(long)];
 
        if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
+           U32 i;
            for (i = 1; i <= rx->nparens; i++) {
-               sprintf(digits, "%lu", (long)i);
-               if ((mgv = gv_fetchpv(digits, FALSE, SVt_PV)))
+               GV *mgv;
+               char digits[TYPE_CHARS(long)];
+               const STRLEN len = my_sprintf(digits, "%lu", (long)i);
+               if ((mgv = gv_fetchpvn_flags(digits, len, FALSE, SVt_PV)))
                    save_scalar(mgv);
            }
        }
@@ -6379,6 +6236,131 @@ clear_re(pTHX_ void *r)
     ReREFCNT_dec((regexp *)r);
 }
 
+#ifdef DEBUGGING
+
+STATIC void
+S_put_byte(pTHX_ SV *sv, int c)
+{
+    if (isCNTRL(c) || c == 255 || !isPRINT(c))
+       Perl_sv_catpvf(aTHX_ sv, "\\%o", c);
+    else if (c == '-' || c == ']' || c == '\\' || c == '^')
+       Perl_sv_catpvf(aTHX_ sv, "\\%c", c);
+    else
+       Perl_sv_catpvf(aTHX_ sv, "%c", c);
+}
+
+
+STATIC regnode *
+S_dumpuntil(pTHX_ regnode *start, regnode *node, regnode *last, SV* sv, I32 l)
+{
+    register U8 op = EXACT;    /* Arbitrary non-END op. */
+    register regnode *next;
+
+    while (op != END && (!last || node < last)) {
+       /* While that wasn't END last time... */
+
+       NODE_ALIGN(node);
+       op = OP(node);
+       if (op == CLOSE)
+           l--;        
+       next = regnext(node);
+       /* Where, what. */
+       if (OP(node) == OPTIMIZED)
+           goto after_print;
+       regprop(sv, node);
+       PerlIO_printf(Perl_debug_log, "%4"IVdf":%*s%s", (IV)(node - start),
+                     (int)(2*l + 1), "", SvPVX_const(sv));
+       if (next == NULL)               /* Next ptr. */
+           PerlIO_printf(Perl_debug_log, "(0)");
+       else
+           PerlIO_printf(Perl_debug_log, "(%"IVdf")", (IV)(next - start));
+       (void)PerlIO_putc(Perl_debug_log, '\n');
+      after_print:
+       if (PL_regkind[(U8)op] == BRANCHJ) {
+           register regnode *nnode = (OP(next) == LONGJMP
+                                      ? regnext(next)
+                                      : next);
+           if (last && nnode > last)
+               nnode = last;
+           node = dumpuntil(start, NEXTOPER(NEXTOPER(node)), nnode, sv, l + 1);
+       }
+       else if (PL_regkind[(U8)op] == BRANCH) {
+           node = dumpuntil(start, NEXTOPER(node), next, sv, l + 1);
+       }
+       else if ( PL_regkind[(U8)op]  == TRIE ) {
+            const I32 n = ARG(node);
+           const reg_trie_data * const trie = (reg_trie_data*)PL_regdata->data[n];
+            const I32 arry_len = av_len(trie->words)+1;
+           I32 word_idx;
+           PerlIO_printf(Perl_debug_log,
+                      "%*s[Words:%d Chars Stored:%d Unique Chars:%d States:%"IVdf"%s]\n",
+                      (int)(2*(l+3)),
+                      "",
+                      trie->wordcount,
+                      (int)trie->charcount,
+                      trie->uniquecharcount,
+                      (IV)trie->laststate-1,
+                      node->flags ? " EVAL mode" : "");
+
+           for (word_idx=0; word_idx < arry_len; word_idx++) {
+               SV **elem_ptr=av_fetch(trie->words,word_idx,0);
+               if (elem_ptr) {
+                   PerlIO_printf(Perl_debug_log, "%*s<%s%s%s>\n",
+                      (int)(2*(l+4)), "",
+                      PL_colors[0],
+                      SvPV_nolen_const(*elem_ptr),
+                      PL_colors[1]
+                   );
+                   /*
+                   if (next == NULL)
+                       PerlIO_printf(Perl_debug_log, "(0)\n");
+                   else
+                       PerlIO_printf(Perl_debug_log, "(%"IVdf")\n", (IV)(next - start));
+                   */
+               }
+
+           }
+
+           node = NEXTOPER(node);
+           node += regarglen[(U8)op];
+
+       }
+       else if ( op == CURLY) {   /* "next" might be very big: optimizer */
+           node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS,
+                            NEXTOPER(node) + EXTRA_STEP_2ARGS + 1, sv, l + 1);
+       }
+       else if (PL_regkind[(U8)op] == CURLY && op != CURLYX) {
+           node = dumpuntil(start, NEXTOPER(node) + EXTRA_STEP_2ARGS,
+                            next, sv, l + 1);
+       }
+       else if ( op == PLUS || op == STAR) {
+           node = dumpuntil(start, NEXTOPER(node), NEXTOPER(node) + 1, sv, l + 1);
+       }
+       else if (op == ANYOF) {
+           /* arglen 1 + class block */
+           node += 1 + ((ANYOF_FLAGS(node) & ANYOF_LARGE)
+                   ? ANYOF_CLASS_SKIP : ANYOF_SKIP);
+           node = NEXTOPER(node);
+       }
+       else if (PL_regkind[(U8)op] == EXACT) {
+            /* Literal string, where present. */
+           node += NODE_SZ_STR(node) - 1;
+           node = NEXTOPER(node);
+       }
+       else {
+           node = NEXTOPER(node);
+           node += regarglen[(U8)op];
+       }
+       if (op == CURLYX || op == OPEN)
+           l++;
+       else if (op == WHILEM)
+           l--;
+    }
+    return node;
+}
+
+#endif /* DEBUGGING */
+
 /*
  * Local variables:
  * c-indentation-style: bsd
@@ -6386,5 +6368,5 @@ clear_re(pTHX_ void *r)
  * indent-tabs-mode: t
  * End:
  *
- * vim: shiftwidth=4:
-*/
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */