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Re: Scalar leaked in 'local $0' under ithreads + taint mode
[perl5.git] / regexec.c
index 1e1d18b..6a644d9 100644 (file)
--- a/regexec.c
+++ b/regexec.c
@@ -55,7 +55,6 @@
 #  define PERL_NO_GET_CONTEXT
 #endif
 
-/*SUPPRESS 112*/
 /*
  * pregcomp and pregexec -- regsub and regerror are not used in perl
  *
 #define HOP3c(pos,off,lim) ((char*)HOP3(pos,off,lim))
 #define HOPMAYBE3c(pos,off,lim) ((char*)HOPMAYBE3(pos,off,lim))
 
-#define LOAD_UTF8_CHARCLASS(a,b) STMT_START { if (!CAT2(PL_utf8_,a)) { ENTER; save_re_context(); (void)CAT2(is_utf8_, a)((const U8*)b); LEAVE; } } STMT_END
+#define LOAD_UTF8_CHARCLASS(class,str) STMT_START { \
+    if (!CAT2(PL_utf8_,class)) { bool ok; ENTER; save_re_context(); ok=CAT2(is_utf8_,class)((const U8*)str); assert(ok); LEAVE; } } STMT_END
+#define LOAD_UTF8_CHARCLASS_ALNUM() LOAD_UTF8_CHARCLASS(alnum,"a")
+#define LOAD_UTF8_CHARCLASS_DIGIT() LOAD_UTF8_CHARCLASS(digit,"0")
+#define LOAD_UTF8_CHARCLASS_SPACE() LOAD_UTF8_CHARCLASS(space," ")
+#define LOAD_UTF8_CHARCLASS_MARK()  LOAD_UTF8_CHARCLASS(mark, "\xcd\x86")
 
 /* for use after a quantifier and before an EXACT-like node -- japhy */
 #define JUMPABLE(rn) ( \
@@ -174,9 +178,9 @@ static void restore_pos(pTHX_ void *arg);
 STATIC CHECKPOINT
 S_regcppush(pTHX_ I32 parenfloor)
 {
-    int retval = PL_savestack_ix;
+    const int retval = PL_savestack_ix;
 #define REGCP_PAREN_ELEMS 4
-    int paren_elems_to_push = (PL_regsize - parenfloor) * REGCP_PAREN_ELEMS;
+    const int paren_elems_to_push = (PL_regsize - parenfloor) * REGCP_PAREN_ELEMS;
     int p;
 
     if (paren_elems_to_push < 0)
@@ -221,7 +225,6 @@ S_regcppop(pTHX)
     I32 i;
     U32 paren = 0;
     char *input;
-    I32 tmps;
 
     GET_RE_DEBUG_FLAGS_DECL;
 
@@ -237,6 +240,7 @@ S_regcppop(pTHX)
     /* Now restore the parentheses context. */
     for (i -= (REGCP_OTHER_ELEMS - REGCP_FRAME_ELEMS);
         i > 0; i -= REGCP_PAREN_ELEMS) {
+       I32 tmps;
        paren = (U32)SSPOPINT;
        PL_reg_start_tmp[paren] = (char *) SSPOPPTR;
        PL_regstartp[paren] = SSPOPINT;
@@ -282,7 +286,7 @@ S_regcppop(pTHX)
 STATIC char *
 S_regcp_set_to(pTHX_ I32 ss)
 {
-    I32 tmp = PL_savestack_ix;
+    const I32 tmp = PL_savestack_ix;
 
     PL_savestack_ix = ss;
     regcppop();
@@ -365,7 +369,7 @@ S_cache_re(pTHX_ regexp *prog)
 
 /* Assumptions: if ANCH_GPOS, then strpos is anchored. XXXX Check GPOS logic */
 
-/* If SCREAM, then SvPVX(sv) should be compatible with strpos and strend.
+/* If SCREAM, then SvPVX_const(sv) should be compatible with strpos and strend.
    Otherwise, only SvCUR(sv) is used to get strbeg. */
 
 /* XXXX We assume that strpos is strbeg unless sv. */
@@ -406,14 +410,14 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
     register SV *check;
     char *strbeg;
     char *t;
-    int do_utf8 = sv ? SvUTF8(sv) : 0; /* if no sv we have to assume bytes */
+    const int do_utf8 = sv ? SvUTF8(sv) : 0;   /* if no sv we have to assume bytes */
     I32 ml_anch;
     register char *other_last = Nullch;        /* other substr checked before this */
     char *check_at = Nullch;           /* check substr found at this pos */
-    I32 multiline = prog->reganch & PMf_MULTILINE;
+    const I32 multiline = prog->reganch & PMf_MULTILINE;
 #ifdef DEBUGGING
-    char *i_strpos = strpos;
-    SV *dsv = PERL_DEBUG_PAD_ZERO(0);
+    const char * const i_strpos = strpos;
+    SV * const dsv = PERL_DEBUG_PAD_ZERO(0);
 #endif
 
     GET_RE_DEBUG_FLAGS_DECL;
@@ -427,10 +431,10 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
     }
 
     DEBUG_EXECUTE_r({
-        char *s   = PL_reg_match_utf8 ?
+        const char *s   = PL_reg_match_utf8 ?
                         sv_uni_display(dsv, sv, 60, UNI_DISPLAY_REGEX) :
                         strpos;
-        int   len = PL_reg_match_utf8 ?
+        const int   len = PL_reg_match_utf8 ?
                         strlen(s) : strend - strpos;
         if (!PL_colorset)
              reginitcolors();
@@ -438,7 +442,7 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
             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",
+                      "%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],
@@ -480,7 +484,7 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
        if (!ml_anch) {
          if ( !(prog->reganch & (ROPT_ANCH_GPOS /* Checked by the caller */
                                  | ROPT_IMPLICIT)) /* not a real BOL */
-              /* SvCUR is not set on references: SvRV and SvPVX overlap */
+              /* SvCUR is not set on references: SvRV and SvPVX_const overlap */
               && sv && !SvROK(sv)
               && (strpos != strbeg)) {
              DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "Not at start...\n"));
@@ -502,17 +506,17 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
                }
                /* Now should match s[0..slen-2] */
                slen--;
-               if (slen && (*SvPVX(check) != *s
+               if (slen && (*SvPVX_const(check) != *s
                             || (slen > 1
-                                && memNE(SvPVX(check), s, slen)))) {
+                                && memNE(SvPVX_const(check), s, slen)))) {
                  report_neq:
                    DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "String not equal...\n"));
                    goto fail_finish;
                }
            }
-           else if (*SvPVX(check) != *s
+           else if (*SvPVX_const(check) != *s
                     || ((slen = SvCUR(check)) > 1
-                        && memNE(SvPVX(check), s, slen)))
+                        && memNE(SvPVX_const(check), s, slen)))
                goto report_neq;
            goto success_at_start;
          }
@@ -523,9 +527,9 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
        end_shift = prog->minlen - start_shift -
            CHR_SVLEN(check) + (SvTAIL(check) != 0);
        if (!ml_anch) {
-           I32 end = prog->check_offset_max + CHR_SVLEN(check)
+           const I32 end = prog->check_offset_max + CHR_SVLEN(check)
                                         - (SvTAIL(check) != 0);
-           I32 eshift = CHR_DIST((U8*)strend, (U8*)s) - end;
+           const I32 eshift = CHR_DIST((U8*)strend, (U8*)s) - end;
 
            if (end_shift < eshift)
                end_shift = eshift;
@@ -550,7 +554,7 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
        the "check" substring in the region corrected by start/end_shift. */
     if (flags & REXEC_SCREAM) {
        I32 p = -1;                     /* Internal iterator of scream. */
-       I32 *pp = data ? data->scream_pos : &p;
+       I32 * const pp = data ? data->scream_pos : &p;
 
        if (PL_screamfirst[BmRARE(check)] >= 0
            || ( BmRARE(check) == '\n'
@@ -562,7 +566,7 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
            goto fail_finish;
        /* we may be pointing at the wrong string */
        if (s && RX_MATCH_COPIED(prog))
-           s = strbeg + (s - SvPVX(sv));
+           s = strbeg + (s - SvPVX_const(sv));
        if (data)
            *data->scream_olds = s;
     }
@@ -578,12 +582,12 @@ 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(PerlIO_printf(Perl_debug_log, "%s %s substr \"%s%.*s%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(check),
+                         SvPVX_const(check),
                          PL_colors[1], (SvTAIL(check) ? "$" : ""),
                          (s ? " at offset " : "...\n") ) );
 
@@ -598,7 +602,7 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
     /* Got a candidate.  Check MBOL anchoring, and the *other* substr.
        Start with the other substr.
        XXXX no SCREAM optimization yet - and a very coarse implementation
-       XXXX /ttx+/ results in anchored=`ttx', floating=`x'.  floating will
+       XXXX /ttx+/ results in anchored="ttx", floating="x".  floating will
                *always* match.  Probably should be marked during compile...
        Probably it is right to do no SCREAM here...
      */
@@ -611,7 +615,8 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
        if (check == (do_utf8 ? prog->float_utf8 : prog->float_substr)) {
          do_other_anchored:
            {
-               char *last = HOP3c(s, -start_shift, strbeg), *last1, *last2;
+               char * const last = HOP3c(s, -start_shift, strbeg);
+               char *last1, *last2;
                char *s1 = s;
                SV* must;
 
@@ -645,12 +650,12 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
                        multiline ? FBMrf_MULTILINE : 0
                    );
                DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log,
-                       "%s anchored substr `%s%.*s%s'%s",
+                       "%s anchored substr \"%s%.*s%s\"%s",
                        (s ? "Found" : "Contradicts"),
                        PL_colors[0],
                          (int)(SvCUR(must)
                          - (SvTAIL(must)!=0)),
-                         SvPVX(must),
+                         SvPVX_const(must),
                          PL_colors[1], (SvTAIL(must) ? "$" : "")));
                if (!s) {
                    if (last1 >= last2) {
@@ -704,11 +709,11 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
                              (unsigned char*)last + SvCUR(must)
                                  - (SvTAIL(must)!=0),
                              must, multiline ? FBMrf_MULTILINE : 0);
-           DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s floating substr `%s%.*s%s'%s",
+           DEBUG_EXECUTE_r(PerlIO_printf(Perl_debug_log, "%s floating substr \"%s%.*s%s\"%s",
                    (s ? "Found" : "Contradicts"),
                    PL_colors[0],
                      (int)(SvCUR(must) - (SvTAIL(must)!=0)),
-                     SvPVX(must),
+                     SvPVX_const(must),
                      PL_colors[1], (SvTAIL(must) ? "$" : "")));
            if (!s) {
                if (last1 == last) {
@@ -857,11 +862,11 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
           regstclass does not come from lookahead...  */
        /* If regstclass takes bytelength more than 1: If charlength==1, OK.
           This leaves EXACTF only, which is dealt with in find_byclass().  */
-        const U8* str = (U8*)STRING(prog->regstclass);
+        const U8* const str = (U8*)STRING(prog->regstclass);
         const int cl_l = (PL_regkind[(U8)OP(prog->regstclass)] == EXACT
                    ? CHR_DIST(str+STR_LEN(prog->regstclass), str)
                    : 1);
-       char *endpos = (prog->anchored_substr || prog->anchored_utf8 || ml_anch)
+       const char * const endpos = (prog->anchored_substr || prog->anchored_utf8 || ml_anch)
                ? HOP3c(s, (prog->minlen ? cl_l : 0), strend)
                : (prog->float_substr || prog->float_utf8
                   ? HOP3c(HOP3c(check_at, -start_shift, strbeg),
@@ -963,10 +968,10 @@ Perl_re_intuit_start(pTHX_ regexp *prog, SV *sv, char *strpos,
 
 /* We know what class REx starts with.  Try to find this position... */
 STATIC char *
-S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun)
+S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, const char *strend, I32 norun)
 {
        dVAR;
-       I32 doevery = (prog->reganch & ROPT_SKIP) == 0;
+       const I32 doevery = (prog->reganch & ROPT_SKIP) == 0;
        char *m;
        STRLEN ln;
        STRLEN lnc;
@@ -975,7 +980,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
        unsigned int c2;
        char *e;
        register I32 tmp = 1;   /* Scratch variable? */
-       register bool do_utf8 = PL_reg_match_utf8;
+       register const bool do_utf8 = PL_reg_match_utf8;
 
        /* We know what class it must start with. */
        switch (OP(c)) {
@@ -1079,7 +1084,6 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
            if (do_utf8) {
                UV c, f;
                U8 tmpbuf [UTF8_MAXBYTES+1];
-               U8 foldbuf[UTF8_MAXBYTES_CASE+1];
                STRLEN len, foldlen;
                
                if (c1 == c2) {
@@ -1096,6 +1100,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
                             && (norun || regtry(prog, 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
@@ -1135,6 +1140,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
                             && (norun || regtry(prog, 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
@@ -1188,7 +1194,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
                }
                tmp = ((OP(c) == BOUND ?
                        isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0);
-               LOAD_UTF8_CHARCLASS(alnum,"a");
+               LOAD_UTF8_CHARCLASS_ALNUM();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (tmp == !(OP(c) == BOUND ?
                                 swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) :
@@ -1231,7 +1237,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
                }
                tmp = ((OP(c) == NBOUND ?
                        isALNUM_uni(tmp) : isALNUM_LC_uvchr(UNI_TO_NATIVE(tmp))) != 0);
-               LOAD_UTF8_CHARCLASS(alnum,"a");
+               LOAD_UTF8_CHARCLASS_ALNUM();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (tmp == !(OP(c) == NBOUND ?
                                 swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8) :
@@ -1260,7 +1266,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
            break;
        case ALNUM:
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(alnum,"a");
+               LOAD_UTF8_CHARCLASS_ALNUM();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8)) {
                        if (tmp && (norun || regtry(prog, s)))
@@ -1318,7 +1324,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
            break;
        case NALNUM:
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(alnum,"a");
+               LOAD_UTF8_CHARCLASS_ALNUM();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (!swash_fetch(PL_utf8_alnum, (U8*)s, do_utf8)) {
                        if (tmp && (norun || regtry(prog, s)))
@@ -1376,7 +1382,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
            break;
        case SPACE:
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(space," ");
+               LOAD_UTF8_CHARCLASS_SPACE();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8)) {
                        if (tmp && (norun || regtry(prog, s)))
@@ -1434,7 +1440,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
            break;
        case NSPACE:
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(space," ");
+               LOAD_UTF8_CHARCLASS_SPACE();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (!(*s == ' ' || swash_fetch(PL_utf8_space,(U8*)s, do_utf8))) {
                        if (tmp && (norun || regtry(prog, s)))
@@ -1492,7 +1498,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
            break;
        case DIGIT:
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(digit,"0");
+               LOAD_UTF8_CHARCLASS_DIGIT();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (swash_fetch(PL_utf8_digit,(U8*)s, do_utf8)) {
                        if (tmp && (norun || regtry(prog, s)))
@@ -1550,7 +1556,7 @@ S_find_byclass(pTHX_ regexp * prog, regnode *c, char *s, char *strend, I32 norun
            break;
        case NDIGIT:
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(digit,"0");
+               LOAD_UTF8_CHARCLASS_DIGIT();
                while (s + (uskip = UTF8SKIP(s)) <= strend) {
                    if (!swash_fetch(PL_utf8_digit,(U8*)s, do_utf8)) {
                        if (tmp && (norun || regtry(prog, s)))
@@ -1632,14 +1638,12 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
     register char *startpos = stringarg;
     I32 minlen;                /* must match at least this many chars */
     I32 dontbother = 0;        /* how many characters not to try at end */
-    /* I32 start_shift = 0; */         /* Offset of the start to find
-                                        constant substr. */            /* CC */
     I32 end_shift = 0;                 /* Same for the end. */         /* CC */
     I32 scream_pos = -1;               /* Internal iterator of scream. */
     char *scream_olds;
     SV* oreplsv = GvSV(PL_replgv);
-    bool do_utf8 = DO_UTF8(sv);
-    I32 multiline = prog->reganch & PMf_MULTILINE;
+    const bool do_utf8 = DO_UTF8(sv);
+    const I32 multiline = prog->reganch & PMf_MULTILINE;
 #ifdef DEBUGGING
     SV *dsv0 = PERL_DEBUG_PAD_ZERO(0);
     SV *dsv1 = PERL_DEBUG_PAD_ZERO(1);
@@ -1647,6 +1651,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
 
     GET_RE_DEBUG_FLAGS_DECL;
 
+    PERL_UNUSED_ARG(data);
     RX_MATCH_UTF8_set(prog,do_utf8);
 
     PL_regcc = 0;
@@ -1731,18 +1736,18 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
     }
 
     DEBUG_EXECUTE_r({
-        char *s0   = UTF ?
-          pv_uni_display(dsv0, (U8*)prog->precomp, prog->prelen, 60,
-                         UNI_DISPLAY_REGEX) :
-          prog->precomp;
-        int   len0 = UTF ? SvCUR(dsv0) : prog->prelen;
-        char *s1   = do_utf8 ? sv_uni_display(dsv1, sv, 60,
+       const char * const s0   = UTF
+           ? pv_uni_display(dsv0, (U8*)prog->precomp, prog->prelen, 60,
+                         UNI_DISPLAY_REGEX)
+           : prog->precomp;
+       const int len0 = UTF ? SvCUR(dsv0) : prog->prelen;
+       const char * const s1 = do_utf8 ? sv_uni_display(dsv1, sv, 60,
                                               UNI_DISPLAY_REGEX) : startpos;
-        int   len1 = do_utf8 ? SvCUR(dsv1) : strend - startpos;
+       const int len1 = do_utf8 ? 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",
+                      "%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],
@@ -1813,7 +1818,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
 #endif
        if (!(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr))
            do_utf8 ? to_utf8_substr(prog) : to_byte_substr(prog);
-       ch = SvPVX(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)[0];
+       ch = SvPVX_const(do_utf8 ? prog->anchored_utf8 : prog->anchored_substr)[0];
 
        if (do_utf8) {
            while (s < strend) {
@@ -1844,7 +1849,6 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
                                   "Did not find anchored character...\n")
                );
     }
-    /*SUPPRESS 560*/
     else if (prog->anchored_substr != Nullsv
              || prog->anchored_utf8 != Nullsv
              || ((prog->float_substr != Nullsv || prog->float_utf8 != Nullsv)
@@ -1882,7 +1886,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
        else
            last1 = s - 1;      /* bogus */
 
-       /* XXXX check_substr already used to find `s', can optimize if
+       /* XXXX check_substr already used to find "s", can optimize if
           check_substr==must. */
        scream_pos = -1;
        dontbother = end_shift;
@@ -1896,7 +1900,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
                                  multiline ? FBMrf_MULTILINE : 0))) ) {
            /* we may be pointing at the wrong string */
            if ((flags & REXEC_SCREAM) && RX_MATCH_COPIED(prog))
-               s = strbeg + (s - SvPVX(sv));
+               s = strbeg + (s - SvPVX_const(sv));
            DEBUG_EXECUTE_r( did_match = 1 );
            if (HOPc(s, -back_max) > last1) {
                last1 = HOPc(s, -back_min);
@@ -1925,12 +1929,12 @@ 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",
+                                  "Did not find %s substr \"%s%.*s%s\"%s...\n",
                              ((must == prog->anchored_substr || must == prog->anchored_utf8)
                               ? "anchored" : "floating"),
                              PL_colors[0],
                              (int)(SvCUR(must) - (SvTAIL(must)!=0)),
-                             SvPVX(must),
+                             SvPVX_const(must),
                                   PL_colors[1], (SvTAIL(must) ? "$" : ""))
                );
        goto phooey;
@@ -1944,22 +1948,22 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
        }
        DEBUG_EXECUTE_r({
            SV *prop = sv_newmortal();
-           char *s0;
-           char *s1;
+           const char *s0;
+           const char *s1;
            int len0;
            int len1;
 
            regprop(prop, c);
            s0 = UTF ?
-             pv_uni_display(dsv0, (U8*)SvPVX(prop), SvCUR(prop), 60,
+             pv_uni_display(dsv0, (U8*)SvPVX_const(prop), SvCUR(prop), 60,
                             UNI_DISPLAY_REGEX) :
-             SvPVX(prop);
+             SvPVX_const(prop);
            len0 = UTF ? SvCUR(dsv0) : SvCUR(prop);
            s1 = UTF ?
              sv_uni_display(dsv1, sv, 60, UNI_DISPLAY_REGEX) : s;
            len1 = UTF ? SvCUR(dsv1) : strend - s;
            PerlIO_printf(Perl_debug_log,
-                         "Matching stclass `%*.*s' against `%*.*s'\n",
+                         "Matching stclass \"%*.*s\" against \"%*.*s\"\n",
                          len0, len0, s0,
                          len1, len1, s1);
        });
@@ -1985,11 +1989,11 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
                    last = scream_olds; /* Only one occurrence. */
                /* we may be pointing at the wrong string */
                else if (RX_MATCH_COPIED(prog))
-                   s = strbeg + (s - SvPVX(sv));
+                   s = strbeg + (s - SvPVX_const(sv));
            }
            else {
                STRLEN len;
-                const char * const little = SvPV(float_real, len);
+                const char * const little = SvPV_const(float_real, len);
 
                if (SvTAIL(float_real)) {
                    if (memEQ(strend - len + 1, little, len - 1))
@@ -2004,7 +2008,7 @@ Perl_regexec_flags(pTHX_ register regexp *prog, char *stringarg, register char *
                    if (len)
                        last = rninstr(s, strend, little, little + len);
                    else
-                       last = strend;  /* matching `$' */
+                       last = strend;  /* matching "$" */
                }
            }
            if (last == NULL) {
@@ -2056,7 +2060,7 @@ got_it:
        RX_MATCH_COPY_FREE(prog);
        if (flags & REXEC_COPY_STR) {
            I32 i = PL_regeol - startpos + (stringarg - strbeg);
-#ifdef PERL_COPY_ON_WRITE
+#ifdef PERL_OLD_COPY_ON_WRITE
            if ((SvIsCOW(sv)
                 || (SvFLAGS(sv) & CAN_COW_MASK) == CAN_COW_FLAGS)) {
                if (DEBUG_C_TEST) {
@@ -2065,7 +2069,7 @@ got_it:
                                  (int) SvTYPE(sv));
                }
                prog->saved_copy = sv_setsv_cow(prog->saved_copy, sv);
-               prog->subbeg = SvPVX(prog->saved_copy);
+               prog->subbeg = (char *)SvPVX_const(prog->saved_copy);
                assert (SvPOKp(prog->saved_copy));
            } else
 #endif
@@ -2143,7 +2147,7 @@ S_regtry(pTHX_ regexp *prog, char *startpos)
            SAVEDESTRUCTOR_X(restore_pos, 0);
         }
         if (!PL_reg_curpm) {
-           Newz(22, PL_reg_curpm, 1, PMOP);
+           Newxz(PL_reg_curpm, 1, PMOP);
 #ifdef USE_ITHREADS
             {
                 SV* repointer = newSViv(0);
@@ -2164,7 +2168,7 @@ S_regtry(pTHX_ regexp *prog, char *startpos)
                $` inside (?{}) could fail... */
            PL_reg_oldsaved = prog->subbeg;
            PL_reg_oldsavedlen = prog->sublen;
-#ifdef PERL_COPY_ON_WRITE
+#ifdef PERL_OLD_COPY_ON_WRITE
            PL_nrs = prog->saved_copy;
 #endif
            RX_MATCH_COPIED_off(prog);
@@ -2189,7 +2193,7 @@ S_regtry(pTHX_ regexp *prog, char *startpos)
         if(PL_reg_start_tmp)
             Renew(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
         else
-            New(22, PL_reg_start_tmp, PL_reg_start_tmpl, char*);
+            Newx(PL_reg_start_tmp, PL_reg_start_tmpl, char*);
     }
 
     /* XXXX What this code is doing here?!!!  There should be no need
@@ -2404,7 +2408,7 @@ S_regmatch(pTHX_ regnode *prog)
 #if 0
     I32 firstcp = PL_savestack_ix;
 #endif
-    register bool do_utf8 = PL_reg_match_utf8;
+    const register bool do_utf8 = PL_reg_match_utf8;
 #ifdef DEBUGGING
     SV *dsv0 = PERL_DEBUG_PAD_ZERO(0);
     SV *dsv1 = PERL_DEBUG_PAD_ZERO(1);
@@ -2427,8 +2431,8 @@ S_regmatch(pTHX_ regnode *prog)
 
         DEBUG_EXECUTE_r( {
            SV *prop = sv_newmortal();
-           int docolor = *PL_colors[0];
-           int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */
+           const int docolor = *PL_colors[0];
+           const int taill = (docolor ? 10 : 7); /* 3 chars for "> <" */
            int l = (PL_regeol - locinput) > taill ? taill : (PL_regeol - locinput);
            /* The part of the string before starttry has one color
               (pref0_len chars), between starttry and current
@@ -2454,22 +2458,22 @@ S_regmatch(pTHX_ regnode *prog)
                pref0_len = pref_len;
            regprop(prop, scan);
            {
-             char *s0 =
+             const char * const s0 =
                do_utf8 && OP(scan) != CANY ?
                pv_uni_display(dsv0, (U8*)(locinput - pref_len),
                               pref0_len, 60, UNI_DISPLAY_REGEX) :
                locinput - pref_len;
-             int len0 = do_utf8 ? strlen(s0) : pref0_len;
-             char *s1 = do_utf8 && OP(scan) != CANY ?
+             const int len0 = do_utf8 ? strlen(s0) : pref0_len;
+             const char * const s1 = do_utf8 && OP(scan) != CANY ?
                pv_uni_display(dsv1, (U8*)(locinput - pref_len + pref0_len),
                               pref_len - pref0_len, 60, UNI_DISPLAY_REGEX) :
                locinput - pref_len + pref0_len;
-             int len1 = do_utf8 ? strlen(s1) : pref_len - pref0_len;
-             char *s2 = do_utf8 && OP(scan) != CANY ?
+             const int len1 = do_utf8 ? strlen(s1) : pref_len - pref0_len;
+             const char * const s2 = do_utf8 && OP(scan) != CANY ?
                pv_uni_display(dsv2, (U8*)locinput,
                               PL_regeol - locinput, 60, UNI_DISPLAY_REGEX) :
                locinput;
-             int len2 = do_utf8 ? strlen(s2) : l;
+             const int len2 = do_utf8 ? strlen(s2) : l;
              PerlIO_printf(Perl_debug_log,
                            "%4"IVdf" <%s%.*s%s%s%.*s%s%s%s%.*s%s>%*s|%3"IVdf":%*s%s\n",
                            (IV)(locinput - PL_bostr),
@@ -2486,7 +2490,7 @@ S_regmatch(pTHX_ regnode *prog)
                            15 - l - pref_len + 1,
                            "",
                            (IV)(scan - PL_regprogram), PL_regindent*2, "",
-                           SvPVX(prop));
+                           SvPVX_const(prop));
            }
        });
 
@@ -2580,7 +2584,7 @@ S_regmatch(pTHX_ regnode *prog)
        case TRIEFL:
            {
 
-               U32 uniflags = ckWARN( WARN_UTF8 ) ? 0 : UTF8_ALLOW_ANY;
+               const U32 uniflags = ckWARN( WARN_UTF8 ) ? 0 : UTF8_ALLOW_ANY;
                U8 *uc = ( U8* )locinput;
                U32 state = 1;
                U16 charid = 0;
@@ -2588,7 +2592,6 @@ S_regmatch(pTHX_ regnode *prog)
                UV uvc = 0;
                STRLEN len = 0;
                STRLEN foldlen = 0;
-               U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
                U8 *uscan = (U8*)NULL;
                STRLEN bufflen=0;
                accepted = 0;
@@ -2610,13 +2613,14 @@ S_regmatch(pTHX_ regnode *prog)
 
                    if ( base ) {
 
-                       if ( do_utf8 || UTF ) {
+                       if ( do_utf8 ) {
                            if ( foldlen>0 ) {
                                uvc = utf8n_to_uvuni( uscan, UTF8_MAXLEN, &len, uniflags );
                                foldlen -= len;
                                uscan += len;
                                len=0;
                            } else {
+                               U8 foldbuf[ UTF8_MAXBYTES_CASE + 1 ];
                                uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags );
                                uvc = to_uni_fold( uvc, foldbuf, &foldlen );
                                foldlen -= UNISKIP( uvc );
@@ -2648,7 +2652,7 @@ S_regmatch(pTHX_ regnode *prog)
               from previous if blocks */
        case TRIE:
            {
-               U32 uniflags = ckWARN( WARN_UTF8 ) ? 0 : UTF8_ALLOW_ANY;
+               const U32 uniflags = ckWARN( WARN_UTF8 ) ? 0 : UTF8_ALLOW_ANY;
                U8 *uc = (U8*)locinput;
                U32 state = 1;
                U16 charid = 0;
@@ -2675,7 +2679,7 @@ S_regmatch(pTHX_ regnode *prog)
 
                    if ( base ) {
 
-                       if ( do_utf8 || UTF ) {
+                       if ( do_utf8 ) {
                            uvc = utf8n_to_uvuni( (U8*)uc, UTF8_MAXLEN, &len, uniflags );
                        } else {
                            uvc = (U32)*uc;
@@ -2722,7 +2726,7 @@ S_regmatch(pTHX_ regnode *prog)
                            "%*s  %sonly one match : #%d <%s>%s\n",
                            REPORT_CODE_OFF+PL_regindent*2, "", PL_colors[4],
                            accept_buff[ 0 ].wordnum,
-                           tmp ? SvPV_nolen( *tmp ) : "not compiled under -Dr",
+                           tmp ? SvPV_nolen_const( *tmp ) : "not compiled under -Dr",
                            PL_colors[5] );
                    });
                    PL_reginput = (char *)accept_buff[ 0 ].endpos;
@@ -2757,7 +2761,7 @@ S_regmatch(pTHX_ regnode *prog)
                            PerlIO_printf( Perl_debug_log, "%*s  %strying alternation #%d <%s> at 0x%p%s\n",
                                REPORT_CODE_OFF+PL_regindent*2, "", PL_colors[4],
                                accept_buff[best].wordnum,
-                               tmp ? SvPV_nolen( *tmp ) : "not compiled under -Dr",scan,
+                               tmp ? SvPV_nolen_const( *tmp ) : "not compiled under -Dr",scan,
                                PL_colors[5] );
                        });
                        if ( best<accepted ) {
@@ -2794,12 +2798,12 @@ S_regmatch(pTHX_ regnode *prog)
            if (do_utf8 != UTF) {
                /* The target and the pattern have differing utf8ness. */
                char *l = locinput;
-               char *e = s + ln;
-               STRLEN ulen;
+               const char *e = s + ln;
 
                if (do_utf8) {
                    /* The target is utf8, the pattern is not utf8. */
                    while (s < e) {
+                       STRLEN ulen;
                        if (l >= PL_regeol)
                             sayNO;
                        if (NATIVE_TO_UNI(*(U8*)s) !=
@@ -2814,6 +2818,7 @@ S_regmatch(pTHX_ regnode *prog)
                else {
                    /* The target is not utf8, the pattern is utf8. */
                    while (s < e) {
+                       STRLEN ulen;
                        if (l >= PL_regeol)
                            sayNO;
                        if (NATIVE_TO_UNI(*((U8*)l)) !=
@@ -2928,7 +2933,7 @@ S_regmatch(pTHX_ regnode *prog)
            if (!nextchr)
                sayNO;
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(alnum,"a");
+               LOAD_UTF8_CHARCLASS_ALNUM();
                if (!(OP(scan) == ALNUM
                      ? swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8)
                      : isALNUM_LC_utf8((U8*)locinput)))
@@ -2951,7 +2956,7 @@ S_regmatch(pTHX_ regnode *prog)
            if (!nextchr && locinput >= PL_regeol)
                sayNO;
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(alnum,"a");
+               LOAD_UTF8_CHARCLASS_ALNUM();
                if (OP(scan) == NALNUM
                    ? swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8)
                    : isALNUM_LC_utf8((U8*)locinput))
@@ -2978,13 +2983,13 @@ S_regmatch(pTHX_ regnode *prog)
                if (locinput == PL_bostr)
                    ln = '\n';
                else {
-                   U8 *r = reghop3((U8*)locinput, -1, (U8*)PL_bostr);
+                   const U8 * const r = reghop3((U8*)locinput, -1, (U8*)PL_bostr);
                
                    ln = utf8n_to_uvchr(r, UTF8SKIP(r), 0, 0);
                }
                if (OP(scan) == BOUND || OP(scan) == NBOUND) {
                    ln = isALNUM_uni(ln);
-                   LOAD_UTF8_CHARCLASS(alnum,"a");
+                   LOAD_UTF8_CHARCLASS_ALNUM();
                    n = swash_fetch(PL_utf8_alnum, (U8*)locinput, do_utf8);
                }
                else {
@@ -3016,7 +3021,7 @@ S_regmatch(pTHX_ regnode *prog)
                sayNO;
            if (do_utf8) {
                if (UTF8_IS_CONTINUED(nextchr)) {
-                   LOAD_UTF8_CHARCLASS(space," ");
+                   LOAD_UTF8_CHARCLASS_SPACE();
                    if (!(OP(scan) == SPACE
                          ? swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8)
                          : isSPACE_LC_utf8((U8*)locinput)))
@@ -3046,7 +3051,7 @@ S_regmatch(pTHX_ regnode *prog)
            if (!nextchr && locinput >= PL_regeol)
                sayNO;
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(space," ");
+               LOAD_UTF8_CHARCLASS_SPACE();
                if (OP(scan) == NSPACE
                    ? swash_fetch(PL_utf8_space, (U8*)locinput, do_utf8)
                    : isSPACE_LC_utf8((U8*)locinput))
@@ -3069,7 +3074,7 @@ S_regmatch(pTHX_ regnode *prog)
            if (!nextchr)
                sayNO;
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(digit,"0");
+               LOAD_UTF8_CHARCLASS_DIGIT();
                if (!(OP(scan) == DIGIT
                      ? swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8)
                      : isDIGIT_LC_utf8((U8*)locinput)))
@@ -3092,7 +3097,7 @@ S_regmatch(pTHX_ regnode *prog)
            if (!nextchr && locinput >= PL_regeol)
                sayNO;
            if (do_utf8) {
-               LOAD_UTF8_CHARCLASS(digit,"0");
+               LOAD_UTF8_CHARCLASS_DIGIT();
                if (OP(scan) == NDIGIT
                    ? swash_fetch(PL_utf8_digit, (U8*)locinput, do_utf8)
                    : isDIGIT_LC_utf8((U8*)locinput))
@@ -3112,7 +3117,7 @@ S_regmatch(pTHX_ regnode *prog)
            if (locinput >= PL_regeol)
                sayNO;
            if  (do_utf8) {
-               LOAD_UTF8_CHARCLASS(mark,"~");
+               LOAD_UTF8_CHARCLASS_MARK();
                if (swash_fetch(PL_utf8_mark,(U8*)locinput, do_utf8))
                    sayNO;
                locinput += PL_utf8skip[nextchr];
@@ -3142,17 +3147,18 @@ S_regmatch(pTHX_ regnode *prog)
            s = PL_bostr + ln;
            if (do_utf8 && OP(scan) != REF) {   /* REF can do byte comparison */
                char *l = locinput;
-               char *e = PL_bostr + PL_regendp[n];
+               const char *e = PL_bostr + PL_regendp[n];
                /*
                 * Note that we can't do the "other character" lookup trick as
                 * in the 8-bit case (no pun intended) because in Unicode we
                 * have to map both upper and title case to lower case.
                 */
                if (OP(scan) == REFF) {
-                   STRLEN ulen1, ulen2;
-                   U8 tmpbuf1[UTF8_MAXBYTES_CASE+1];
-                   U8 tmpbuf2[UTF8_MAXBYTES_CASE+1];
                    while (s < e) {
+                       STRLEN ulen1, ulen2;
+                       U8 tmpbuf1[UTF8_MAXBYTES_CASE+1];
+                       U8 tmpbuf2[UTF8_MAXBYTES_CASE+1];
+
                        if (l >= PL_regeol)
                            sayNO;
                        toLOWER_utf8((U8*)s, tmpbuf1, &ulen1);
@@ -3246,15 +3252,15 @@ S_regmatch(pTHX_ regnode *prog)
                    }
                    else {
                        STRLEN len;
-                       char *t = SvPV(ret, len);
+                       const char *t = SvPV_const(ret, len);
                        PMOP pm;
-                       char *oprecomp = PL_regprecomp;
-                       I32 osize = PL_regsize;
-                       I32 onpar = PL_regnpar;
+                       char * const oprecomp = PL_regprecomp;
+                       const I32 osize = PL_regsize;
+                       const I32 onpar = PL_regnpar;
 
                        Zero(&pm, 1, PMOP);
                         if (DO_UTF8(ret)) pm.op_pmdynflags |= PMdf_DYN_UTF8;
-                       re = CALLREGCOMP(aTHX_ t, t + len, &pm);
+                       re = CALLREGCOMP(aTHX_ (char*)t, (char*)t + len, &pm);
                        if (!(SvFLAGS(ret)
                              & (SVs_TEMP | SVs_PADTMP | SVf_READONLY
                                | SVs_GMG)))
@@ -3266,7 +3272,7 @@ S_regmatch(pTHX_ regnode *prog)
                    }
                    DEBUG_EXECUTE_r(
                        PerlIO_printf(Perl_debug_log,
-                                     "Entering embedded `%s%.60s%s%s'\n",
+                                     "Entering embedded \"%s%.60s%s%s\"\n",
                                      PL_colors[0],
                                      re->precomp,
                                      PL_colors[1],
@@ -3539,7 +3545,7 @@ S_regmatch(pTHX_ regnode *prog)
                    PL_reg_leftiter = PL_reg_maxiter;
                }
                if (PL_reg_leftiter-- == 0) {
-                   I32 size = (PL_reg_maxiter + 7 + POSCACHE_START)/8;
+                   const I32 size = (PL_reg_maxiter + 7 + POSCACHE_START)/8;
                    if (PL_reg_poscache) {
                        if ((I32)PL_reg_poscache_size < size) {
                            Renew(PL_reg_poscache, size, char);
@@ -3549,7 +3555,7 @@ S_regmatch(pTHX_ regnode *prog)
                    }
                    else {
                        PL_reg_poscache_size = size;
-                       Newz(29, PL_reg_poscache, size, char);
+                       Newxz(PL_reg_poscache, size, char);
                    }
                    DEBUG_EXECUTE_r(
                        PerlIO_printf(Perl_debug_log,
@@ -3688,7 +3694,7 @@ S_regmatch(pTHX_ regnode *prog)
                if (OP(next) != c1)     /* No choice. */
                    next = inner;       /* Avoid recursion. */
                else {
-                   I32 lastparen = *PL_reglastparen;
+                   const I32 lastparen = *PL_reglastparen;
                    I32 unwind1;
                    re_unwind_branch_t *uw;
 
@@ -3998,8 +4004,8 @@ S_regmatch(pTHX_ regnode *prog)
                            count = locinput - old;
                        }
                        else {
-                           STRLEN len;
                            if (c1 == c2) {
+                               STRLEN len;
                                /* count initialised to
                                 * utf8_distance(old, locinput) */
                                while (locinput <= e &&
@@ -4011,6 +4017,7 @@ S_regmatch(pTHX_ regnode *prog)
                                    count++;
                                }
                            } else {
+                               STRLEN len;
                                /* count initialised to
                                 * utf8_distance(old, locinput) */
                                while (locinput <= e) {
@@ -4303,7 +4310,7 @@ do_no:
        case RE_UNWIND_BRANCHJ:
        {
            re_unwind_branch_t *uwb = &(uw->branch);
-           I32 lastparen = uwb->lastparen;
+           const I32 lastparen = uwb->lastparen;
        
            REGCP_UNWIND(uwb->lastcp);
            for (n = *PL_reglastparen; n > lastparen; n--)
@@ -4320,7 +4327,6 @@ do_no:
                goto do_no;
            }
            /* Have more choice yet.  Reuse the same uwb.  */
-           /*SUPPRESS 560*/
            if ((n = (uwb->type == RE_UNWIND_BRANCH
                      ? NEXT_OFF(next) : ARG(next))))
                next += n;
@@ -4359,7 +4365,7 @@ do_no:
  * rather than incrementing count on every character.  [Er, except utf8.]]
  */
 STATIC I32
-S_regrepeat(pTHX_ regnode *p, I32 max)
+S_regrepeat(pTHX_ const regnode *p, I32 max)
 {
     dVAR;
     register char *scan;
@@ -4434,7 +4440,7 @@ S_regrepeat(pTHX_ regnode *p, I32 max)
     case ALNUM:
        if (do_utf8) {
            loceol = PL_regeol;
-           LOAD_UTF8_CHARCLASS(alnum,"a");
+           LOAD_UTF8_CHARCLASS_ALNUM();
            while (hardcount < max && scan < loceol &&
                   swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) {
                scan += UTF8SKIP(scan);
@@ -4462,7 +4468,7 @@ S_regrepeat(pTHX_ regnode *p, I32 max)
     case NALNUM:
        if (do_utf8) {
            loceol = PL_regeol;
-           LOAD_UTF8_CHARCLASS(alnum,"a");
+           LOAD_UTF8_CHARCLASS_ALNUM();
            while (hardcount < max && scan < loceol &&
                   !swash_fetch(PL_utf8_alnum, (U8*)scan, do_utf8)) {
                scan += UTF8SKIP(scan);
@@ -4490,7 +4496,7 @@ S_regrepeat(pTHX_ regnode *p, I32 max)
     case SPACE:
        if (do_utf8) {
            loceol = PL_regeol;
-           LOAD_UTF8_CHARCLASS(space," ");
+           LOAD_UTF8_CHARCLASS_SPACE();
            while (hardcount < max && scan < loceol &&
                   (*scan == ' ' ||
                    swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) {
@@ -4519,7 +4525,7 @@ S_regrepeat(pTHX_ regnode *p, I32 max)
     case NSPACE:
        if (do_utf8) {
            loceol = PL_regeol;
-           LOAD_UTF8_CHARCLASS(space," ");
+           LOAD_UTF8_CHARCLASS_SPACE();
            while (hardcount < max && scan < loceol &&
                   !(*scan == ' ' ||
                     swash_fetch(PL_utf8_space,(U8*)scan, do_utf8))) {
@@ -4548,7 +4554,7 @@ S_regrepeat(pTHX_ regnode *p, I32 max)
     case DIGIT:
        if (do_utf8) {
            loceol = PL_regeol;
-           LOAD_UTF8_CHARCLASS(digit,"0");
+           LOAD_UTF8_CHARCLASS_DIGIT();
            while (hardcount < max && scan < loceol &&
                   swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) {
                scan += UTF8SKIP(scan);
@@ -4562,7 +4568,7 @@ S_regrepeat(pTHX_ regnode *p, I32 max)
     case NDIGIT:
        if (do_utf8) {
            loceol = PL_regeol;
-           LOAD_UTF8_CHARCLASS(digit,"0");
+           LOAD_UTF8_CHARCLASS_DIGIT();
            while (hardcount < max && scan < loceol &&
                   !swash_fetch(PL_utf8_digit, (U8*)scan, do_utf8)) {
                scan += UTF8SKIP(scan);
@@ -4591,7 +4597,7 @@ S_regrepeat(pTHX_ regnode *p, I32 max)
                regprop(prop, p);
                PerlIO_printf(Perl_debug_log,
                              "%*s  %s can match %"IVdf" times out of %"IVdf"...\n",
-                             REPORT_CODE_OFF+1, "", SvPVX(prop),(IV)c,(IV)max);
+                             REPORT_CODE_OFF+1, "", SvPVX_const(prop),(IV)c,(IV)max);
        });
        });
 
@@ -4655,18 +4661,18 @@ S_regrepeat_hard(pTHX_ regnode *p, I32 max, I32 *lp)
 */
 
 SV *
-Perl_regclass_swash(pTHX_ register regnode* node, bool doinit, SV** listsvp, SV **altsvp)
+Perl_regclass_swash(pTHX_ register const regnode* node, bool doinit, SV** listsvp, SV **altsvp)
 {
     SV *sw  = NULL;
     SV *si  = NULL;
     SV *alt = NULL;
 
     if (PL_regdata && PL_regdata->count) {
-       U32 n = ARG(node);
+       const U32 n = ARG(node);
 
        if (PL_regdata->what[n] == 's') {
-           SV *rv = (SV*)PL_regdata->data[n];
-           AV *av = (AV*)SvRV((SV*)rv);
+           SV * const rv = (SV*)PL_regdata->data[n];
+           AV * const av = (AV*)SvRV((SV*)rv);
            SV **ary = AvARRAY(av);
            SV **a, **b;
        
@@ -4707,10 +4713,10 @@ Perl_regclass_swash(pTHX_ register regnode* node, bool doinit, SV** listsvp, SV
  */
 
 STATIC bool
-S_reginclass(pTHX_ register regnode *n, register U8* p, STRLEN* lenp, register bool do_utf8)
+S_reginclass(pTHX_ register const regnode *n, register const U8* p, STRLEN* lenp, register bool do_utf8)
 {
     dVAR;
-    char flags = ANYOF_FLAGS(n);
+    const char flags = ANYOF_FLAGS(n);
     bool match = FALSE;
     UV c = *p;
     STRLEN len = 0;
@@ -4732,7 +4738,7 @@ S_reginclass(pTHX_ register regnode *n, register U8* p, STRLEN* lenp, register b
            match = TRUE;
        if (!match) {
            AV *av;
-           SV *sw = regclass_swash(n, TRUE, 0, (SV**)&av);
+           SV * const sw = regclass_swash(n, TRUE, 0, (SV**)&av);
        
            if (sw) {
                if (swash_fetch(sw, p, do_utf8))
@@ -4740,11 +4746,10 @@ S_reginclass(pTHX_ register regnode *n, register U8* p, STRLEN* lenp, register b
                else if (flags & ANYOF_FOLD) {
                    if (!match && lenp && av) {
                        I32 i;
-                     
                        for (i = 0; i <= av_len(av); i++) {
-                           SV* sv = *av_fetch(av, i, FALSE);
+                           SV* const sv = *av_fetch(av, i, FALSE);
                            STRLEN len;
-                           char *s = SvPV(sv, len);
+                           const char * const s = SvPV_const(sv, len);
                        
                            if (len <= plen && memEQ(s, (char*)p, len)) {
                                *lenp = len;
@@ -4895,12 +4900,12 @@ S_reghopmaybe3(pTHX_ U8* s, I32 off, U8* lim)
 static void
 restore_pos(pTHX_ void *arg)
 {
-    (void)arg; /* unused */
+    PERL_UNUSED_ARG(arg);
     if (PL_reg_eval_set) {
        if (PL_reg_oldsaved) {
            PL_reg_re->subbeg = PL_reg_oldsaved;
            PL_reg_re->sublen = PL_reg_oldsavedlen;
-#ifdef PERL_COPY_ON_WRITE
+#ifdef PERL_OLD_COPY_ON_WRITE
            PL_reg_re->saved_copy = PL_nrs;
 #endif
            RX_MATCH_COPIED_on(PL_reg_re);
@@ -4914,8 +4919,8 @@ restore_pos(pTHX_ void *arg)
 STATIC void
 S_to_utf8_substr(pTHX_ register regexp *prog)
 {
-    SV* sv;
     if (prog->float_substr && !prog->float_utf8) {
+       SV* sv;
        prog->float_utf8 = sv = newSVsv(prog->float_substr);
        sv_utf8_upgrade(sv);
        if (SvTAIL(prog->float_substr))
@@ -4924,6 +4929,7 @@ S_to_utf8_substr(pTHX_ register regexp *prog)
            prog->check_utf8 = sv;
     }
     if (prog->anchored_substr && !prog->anchored_utf8) {
+       SV* sv;
        prog->anchored_utf8 = sv = newSVsv(prog->anchored_substr);
        sv_utf8_upgrade(sv);
        if (SvTAIL(prog->anchored_substr))
@@ -4936,8 +4942,8 @@ S_to_utf8_substr(pTHX_ register regexp *prog)
 STATIC void
 S_to_byte_substr(pTHX_ register regexp *prog)
 {
-    SV* sv;
     if (prog->float_utf8 && !prog->float_substr) {
+       SV* sv;
        prog->float_substr = sv = newSVsv(prog->float_utf8);
        if (sv_utf8_downgrade(sv, TRUE)) {
            if (SvTAIL(prog->float_utf8))
@@ -4950,6 +4956,7 @@ S_to_byte_substr(pTHX_ register regexp *prog)
            prog->check_substr = sv;
     }
     if (prog->anchored_utf8 && !prog->anchored_substr) {
+       SV* sv;
        prog->anchored_substr = sv = newSVsv(prog->anchored_utf8);
        if (sv_utf8_downgrade(sv, TRUE)) {
            if (SvTAIL(prog->anchored_utf8))