This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Fix CORE::glob
[perl5.git] / toke.c
diff --git a/toke.c b/toke.c
index 380722a..aaeff85 100644 (file)
--- a/toke.c
+++ b/toke.c
@@ -224,6 +224,7 @@ static const char* const lex_state_names[] = {
  * LOOPX        : loop exiting command (goto, last, dump, etc)
  * FTST         : file test operator
  * FUN0         : zero-argument function
+ * FUN0OP       : zero-argument function, with its op created in this file
  * FUN1         : not used, except for not, which isn't a UNIOP
  * BOop         : bitwise or or xor
  * BAop         : bitwise and
@@ -254,6 +255,7 @@ static const char* const lex_state_names[] = {
 #define LOOPX(f) return (pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)LOOPEX))
 #define FTST(f)  return (pl_yylval.ival=f, PL_expect=XTERMORDORDOR, PL_bufptr=s, REPORT((int)UNIOP))
 #define FUN0(f)  return (pl_yylval.ival=f, PL_expect=XOPERATOR, PL_bufptr=s, REPORT((int)FUNC0))
+#define FUN0OP(f)  return (pl_yylval.opval=f, CLINE, PL_expect=XOPERATOR, PL_bufptr=s, REPORT((int)FUNC0OP))
 #define FUN1(f)  return (pl_yylval.ival=f, PL_expect=XOPERATOR, PL_bufptr=s, REPORT((int)FUNC1))
 #define BOop(f)  return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)BITOROP)))
 #define BAop(f)  return ao((pl_yylval.ival=f, PL_expect=XTERM, PL_bufptr=s, REPORT((int)BITANDOP)))
@@ -346,6 +348,7 @@ static struct debug_tokens {
     { FORMAT,          TOKENTYPE_NONE,         "FORMAT" },
     { FUNC,            TOKENTYPE_OPNUM,        "FUNC" },
     { FUNC0,           TOKENTYPE_OPNUM,        "FUNC0" },
+    { FUNC0OP,         TOKENTYPE_OPVAL,        "FUNC0OP" },
     { FUNC0SUB,                TOKENTYPE_OPVAL,        "FUNC0SUB" },
     { FUNC1,           TOKENTYPE_OPNUM,        "FUNC1" },
     { FUNCMETH,                TOKENTYPE_OPVAL,        "FUNCMETH" },
@@ -667,11 +670,15 @@ code in I<line> comes first and must consist of complete lines of input,
 and I<rsfp> supplies the remainder of the source.
 
 The I<flags> parameter is reserved for future use, and must always
-be zero.
+be zero, except for one flag that is currently reserved for perl's internal
+use.
 
 =cut
 */
 
+/* LEX_START_SAME_FILTER indicates that this is not a new file, so it
+   can share filters with the current parser. */
+
 void
 Perl_lex_start(pTHX_ SV *line, PerlIO *rsfp, U32 flags)
 {
@@ -679,7 +686,7 @@ Perl_lex_start(pTHX_ SV *line, PerlIO *rsfp, U32 flags)
     const char *s = NULL;
     STRLEN len;
     yy_parser *parser, *oparser;
-    if (flags)
+    if (flags && flags != LEX_START_SAME_FILTER)
        Perl_croak(aTHX_ "Lexing code internal error (%s)", "lex_start");
 
     /* create and initialise a parser */
@@ -708,7 +715,10 @@ Perl_lex_start(pTHX_ SV *line, PerlIO *rsfp, U32 flags)
     parser->lex_state = LEX_NORMAL;
     parser->expect = XSTATE;
     parser->rsfp = rsfp;
-    parser->rsfp_filters = newAV();
+    parser->rsfp_filters =
+      !(flags & LEX_START_SAME_FILTER) || !oparser
+        ? newAV()
+        : MUTABLE_AV(SvREFCNT_inc(oparser->rsfp_filters));
 
     Newx(parser->lex_brackstack, 120, char);
     Newx(parser->lex_casestack, 12, char);
@@ -1407,7 +1417,10 @@ Perl_lex_read_unichar(pTHX_ U32 flags)
     if (c != -1) {
        if (c == '\n')
            CopLINE_inc(PL_curcop);
-       PL_parser->bufptr += UTF8SKIP(PL_parser->bufptr);
+       if (UTF)
+           PL_parser->bufptr += UTF8SKIP(PL_parser->bufptr);
+       else
+           ++(PL_parser->bufptr);
     }
     return c;
 }
@@ -1511,6 +1524,7 @@ S_incline(pTHX_ const char *s)
     const char *t;
     const char *n;
     const char *e;
+    line_t line_num;
 
     PERL_ARGS_ASSERT_INCLINE;
 
@@ -1554,9 +1568,10 @@ S_incline(pTHX_ const char *s)
     if (*e != '\n' && *e != '\0')
        return;         /* false alarm */
 
+    line_num = atoi(n)-1;
+
     if (t - s > 0) {
        const STRLEN len = t - s;
-#ifndef USE_ITHREADS
        SV *const temp_sv = CopFILESV(PL_curcop);
        const char *cf;
        STRLEN tmplen;
@@ -1611,19 +1626,35 @@ S_incline(pTHX_ const char *s)
                    gv_init(gv2, PL_defstash, tmpbuf2, tmplen2, FALSE);
                    /* adjust ${"::_<newfilename"} to store the new file name */
                    GvSV(gv2) = newSVpvn(tmpbuf2 + 2, tmplen2 - 2);
-                   GvHV(gv2) = MUTABLE_HV(SvREFCNT_inc(GvHV(*gvp)));
-                   GvAV(gv2) = MUTABLE_AV(SvREFCNT_inc(GvAV(*gvp)));
+                   /* The line number may differ. If that is the case,
+                      alias the saved lines that are in the array.
+                      Otherwise alias the whole array. */
+                   if (CopLINE(PL_curcop) == line_num) {
+                       GvHV(gv2) = MUTABLE_HV(SvREFCNT_inc(GvHV(*gvp)));
+                       GvAV(gv2) = MUTABLE_AV(SvREFCNT_inc(GvAV(*gvp)));
+                   }
+                   else if (GvAV(*gvp)) {
+                       AV * const av = GvAV(*gvp);
+                       const I32 start = CopLINE(PL_curcop)+1;
+                       I32 items = AvFILLp(av) - start;
+                       if (items > 0) {
+                           AV * const av2 = GvAVn(gv2);
+                           SV **svp = AvARRAY(av) + start;
+                           I32 l = (I32)line_num+1;
+                           while (items--)
+                               av_store(av2, l++, SvREFCNT_inc(*svp++));
+                       }
+                   }
                }
 
                if (tmpbuf2 != smallbuf) Safefree(tmpbuf2);
            }
            if (tmpbuf != smallbuf) Safefree(tmpbuf);
        }
-#endif
        CopFILE_free(PL_curcop);
        CopFILE_setn(PL_curcop, s, len);
     }
-    CopLINE_set(PL_curcop, atoi(n)-1);
+    CopLINE_set(PL_curcop, line_num);
 }
 
 #ifdef PERL_MAD
@@ -2062,7 +2093,8 @@ S_force_ident(pTHX_ register const char *s, int kind)
 
     if (*s) {
        const STRLEN len = strlen(s);
-       OP* const o = (OP*)newSVOP(OP_CONST, 0, newSVpvn(s, len));
+       OP* const o = (OP*)newSVOP(OP_CONST, 0, newSVpvn_flags(s, len,
+                                                                UTF ? SVf_UTF8 : 0));
        start_force(PL_curforce);
        NEXTVAL_NEXTTOKE.opval = o;
        force_next(WORD);
@@ -2072,8 +2104,8 @@ S_force_ident(pTHX_ register const char *s, int kind)
               warnings if the symbol must be introduced in an eval.
               GSAR 96-10-12 */
            gv_fetchpvn_flags(s, len,
-                             PL_in_eval ? (GV_ADDMULTI | GV_ADDINEVAL)
-                             : GV_ADD,
+                             (PL_in_eval ? (GV_ADDMULTI | GV_ADDINEVAL)
+                             : GV_ADD) | ( UTF ? SVf_UTF8 : 0 ),
                              kind == '$' ? SVt_PV :
                              kind == '@' ? SVt_PVAV :
                              kind == '%' ? SVt_PVHV :
@@ -3122,12 +3154,22 @@ S_scan_const(pTHX_ char *start)
 
                    if (PL_lex_inpat) {
 
-                       /* Pass through to the regex compiler unchanged.  The
-                        * reason we evaluated the number above is to make sure
-                        * there wasn't a syntax error. */
+                       /* On non-EBCDIC platforms, pass through to the regex
+                        * compiler unchanged.  The reason we evaluated the
+                        * number above is to make sure there wasn't a syntax
+                        * error.  But on EBCDIC we convert to native so
+                        * downstream code can continue to assume it's native
+                        */
                        s -= 5;     /* Include the '\N{U+' */
+#ifdef EBCDIC
+                       d += my_snprintf(d, e - s + 1 + 1,  /* includes the }
+                                                              and the \0 */
+                                   "\\N{U+%X}",
+                                   (unsigned int) UNI_TO_NATIVE(uv));
+#else
                        Copy(s, d, e - s + 1, char);    /* 1 = include the } */
                        d += e - s + 1;
+#endif
                    }
                    else {  /* Not a pattern: convert the hex to string */
 
@@ -3221,10 +3263,13 @@ S_scan_const(pTHX_ char *start)
                            }
 
                            /* Convert first code point to hex, including the
-                            * boiler plate before it */
+                            * boiler plate before it.  For all these, we
+                            * convert to native format so that downstream code
+                            * can continue to assume the input is native */
                            output_length =
                                my_snprintf(hex_string, sizeof(hex_string),
-                                           "\\N{U+%X", (unsigned int) uv);
+                                           "\\N{U+%X",
+                                           (unsigned int) UNI_TO_NATIVE(uv));
 
                            /* Make sure there is enough space to hold it */
                            d = off + SvGROW(sv, off
@@ -3249,7 +3294,8 @@ S_scan_const(pTHX_ char *start)
 
                                output_length =
                                    my_snprintf(hex_string, sizeof(hex_string),
-                                               ".%X", (unsigned int) uv);
+                                           ".%X",
+                                           (unsigned int) UNI_TO_NATIVE(uv));
 
                                d = off + SvGROW(sv, off
                                                     + output_length
@@ -3585,7 +3631,8 @@ S_intuit_more(pTHX_ register char *s)
                    int len;
                    scan_ident(s, send, tmpbuf, sizeof tmpbuf, FALSE);
                    len = (int)strlen(tmpbuf);
-                   if (len > 1 && gv_fetchpvn_flags(tmpbuf, len, 0, SVt_PV))
+                   if (len > 1 && gv_fetchpvn_flags(tmpbuf, len,
+                                                    UTF ? SVf_UTF8 : 0, SVt_PV))
                        weight -= 100;
                    else
                        weight -= 10;
@@ -3692,7 +3739,7 @@ S_intuit_method(pTHX_ char *start, GV *gv, CV *cv)
            return 0;
        if (cv) {
            if (SvPOK(cv)) {
-               const char *proto = SvPVX_const(cv);
+               const char *proto = CvPROTO(cv);
                if (proto) {
                    if (*proto == ';')
                        proto++;
@@ -3733,11 +3780,11 @@ S_intuit_method(pTHX_ char *start, GV *gv, CV *cv)
 #endif
            goto bare_package;
        }
-       indirgv = gv_fetchpvn_flags(tmpbuf, len, 0, SVt_PVCV);
+       indirgv = gv_fetchpvn_flags(tmpbuf, len, ( UTF ? SVf_UTF8 : 0 ), SVt_PVCV);
        if (indirgv && GvCVu(indirgv))
            return 0;
        /* filehandle or package name makes it a method */
-       if (!gv || GvIO(indirgv) || gv_stashpvn(tmpbuf, len, 0)) {
+       if (!gv || GvIO(indirgv) || gv_stashpvn(tmpbuf, len, UTF ? SVf_UTF8 : 0)) {
 #ifdef PERL_MAD
            soff = s - SvPVX(PL_linestr);
 #endif
@@ -3750,7 +3797,8 @@ S_intuit_method(pTHX_ char *start, GV *gv, CV *cv)
                                                  S_newSV_maybe_utf8(aTHX_ tmpbuf, len));
            NEXTVAL_NEXTTOKE.opval->op_private = OPpCONST_BARE;
            if (PL_madskills)
-               curmad('X', newSVpvn(start,SvPVX(PL_linestr) + soff - start));
+               curmad('X', newSVpvn_flags(start,SvPVX(PL_linestr) + soff - start,
+                                                            ( UTF ? SVf_UTF8 : 0 )));
            PL_expect = XTERM;
            force_next(WORD);
            PL_bufptr = s;
@@ -3944,20 +3992,20 @@ S_find_in_my_stash(pTHX_ const char *pkgname, STRLEN len)
 
     if (len > 2 &&
         (pkgname[len - 2] == ':' && pkgname[len - 1] == ':') &&
-        (gv = gv_fetchpvn_flags(pkgname, len, 0, SVt_PVHV)))
+        (gv = gv_fetchpvn_flags(pkgname, len, ( UTF ? SVf_UTF8 : 0 ), SVt_PVHV)))
     {
         return GvHV(gv);                       /* Foo:: */
     }
 
     /* use constant CLASS => 'MyClass' */
-    gv = gv_fetchpvn_flags(pkgname, len, 0, SVt_PVCV);
+    gv = gv_fetchpvn_flags(pkgname, len, UTF ? SVf_UTF8 : 0, SVt_PVCV);
     if (gv && GvCV(gv)) {
        SV * const sv = cv_const_sv(GvCV(gv));
        if (sv)
             pkgname = SvPV_const(sv, len);
     }
 
-    return gv_stashpvn(pkgname, len, 0);
+    return gv_stashpvn(pkgname, len, UTF ? SVf_UTF8 : 0);
 }
 
 /*
@@ -4753,7 +4801,13 @@ Perl_yylex(pTHX)
                      *(U8*)s == 0xEF ||
                      *(U8*)s >= 0xFE ||
                      s[1] == 0)) {
-               bof = PerlIO_tell(PL_rsfp) == (Off_t)SvCUR(PL_linestr);
+               Off_t offset = (IV)PerlIO_tell(PL_rsfp);
+               bof = (offset == (Off_t)SvCUR(PL_linestr));
+#if defined(PERLIO_USING_CRLF) && defined(PERL_TEXTMODE_SCRIPTS)
+               /* offset may include swallowed CR */
+               if (!bof)
+                   bof = (offset == (Off_t)SvCUR(PL_linestr)+1);
+#endif
                if (bof) {
                    PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
                    s = swallow_bom((U8*)s);
@@ -5328,7 +5382,7 @@ Perl_yylex(pTHX)
                        break;
                    }
                }
-               sv = newSVpvn(s, len);
+               sv = newSVpvn_flags(s, len, UTF ? SVf_UTF8 : 0);
                if (*d == '(') {
                    d = scan_str(d,TRUE,TRUE);
                    if (!d) {
@@ -5975,14 +6029,6 @@ Perl_yylex(pTHX)
            PREREF('$');
        }
 
-       /* This kludge not intended to be bulletproof. */
-       if (PL_tokenbuf[1] == '[' && !PL_tokenbuf[2]) {
-           pl_yylval.opval = newSVOP(OP_CONST, 0,
-                                  newSViv(CopARYBASE_get(&PL_compiling)));
-           pl_yylval.opval->op_private = OPpCONST_ARYBASE;
-           TERM(THING);
-       }
-
        d = s;
        {
            const char tmp = *s;
@@ -6298,7 +6344,8 @@ Perl_yylex(pTHX)
            else if (!isALPHA(*start) && (PL_expect == XTERM
                        || PL_expect == XREF || PL_expect == XSTATE
                        || PL_expect == XTERMORDORDOR)) {
-               GV *const gv = gv_fetchpvn_flags(s, start - s, 0, SVt_PVCV);
+               GV *const gv = gv_fetchpvn_flags(s, start - s,
+                                                    UTF ? SVf_UTF8 : 0, SVt_PVCV);
                if (!gv) {
                    s = scan_num(s, &pl_yylval);
                    TERM(THING);
@@ -6417,7 +6464,8 @@ Perl_yylex(pTHX)
            GV *hgv = NULL;     /* hidden (loser) */
            if (PL_expect != XOPERATOR && (*s != ':' || s[1] != ':')) {
                CV *cv;
-               if ((gv = gv_fetchpvn_flags(PL_tokenbuf, len, 0, SVt_PVCV)) &&
+               if ((gv = gv_fetchpvn_flags(PL_tokenbuf, len,
+                                            UTF ? SVf_UTF8 : 0, SVt_PVCV)) &&
                    (cv = GvCVu(gv)))
                {
                    if (GvIMPORTED_CV(gv))
@@ -6426,7 +6474,8 @@ Perl_yylex(pTHX)
                        hgv = gv;
                }
                if (!ogv &&
-                   (gvp = (GV**)hv_fetch(PL_globalstash,PL_tokenbuf,len,FALSE)) &&
+                   (gvp = (GV**)hv_fetch(PL_globalstash, PL_tokenbuf,
+                                            UTF ? -(I32)len : (I32)len, FALSE)) &&
                    (gv = *gvp) && isGV_with_GP(gv) &&
                    GvCVu(gv) && GvIMPORTED_CV(gv))
                {
@@ -6515,7 +6564,7 @@ Perl_yylex(pTHX)
                    PL_tokenbuf[len - 2] == ':' && PL_tokenbuf[len - 1] == ':')
                {
                    if (ckWARN(WARN_BAREWORD)
-                       && ! gv_fetchpvn_flags(PL_tokenbuf, len, 0, SVt_PVHV))
+                       && ! gv_fetchpvn_flags(PL_tokenbuf, len, UTF ? SVf_UTF8 : 0, SVt_PVHV))
                        Perl_warner(aTHX_ packWARN(WARN_BAREWORD),
                            "Bareword \"%s\" refers to nonexistent package",
                             PL_tokenbuf);
@@ -6531,7 +6580,8 @@ Perl_yylex(pTHX)
                           constants that might already be there into full
                           blown PVGVs with attached PVCV.  */
                        gv = gv_fetchpvn_flags(PL_tokenbuf, len,
-                                              GV_NOADD_NOINIT, SVt_PVCV);
+                                              GV_NOADD_NOINIT | ( UTF ? SVf_UTF8 : 0 ),
+                                              SVt_PVCV);
                    }
                    len = 0;
                }
@@ -6565,7 +6615,7 @@ Perl_yylex(pTHX)
                    goto safe_bareword;
 
                {
-                   OP *const_op = newSVOP(OP_CONST, 0, SvREFCNT_inc(sv));
+                   OP *const_op = newSVOP(OP_CONST, 0, SvREFCNT_inc_NN(sv));
                    const_op->op_private = OPpCONST_BARE;
                    rv2cv_op = newCVREF(0, const_op);
                }
@@ -6725,8 +6775,8 @@ Perl_yylex(pTHX)
 #endif
                        SvPOK(cv))
                    {
-                       STRLEN protolen;
-                       const char *proto = SvPV_const(MUTABLE_SV(cv), protolen);
+                       STRLEN protolen = CvPROTOLEN(cv);
+                       const char *proto = CvPROTO(cv);
                        if (!protolen)
                            TERM(FUNC0SUB);
                        while (*proto == ';')
@@ -6803,7 +6853,8 @@ Perl_yylex(pTHX)
                        }
                    }
                    if (probable_sub) {
-                       gv = gv_fetchpv(PL_tokenbuf, GV_ADD, SVt_PVCV);
+                       gv = gv_fetchpv(PL_tokenbuf, GV_ADD | ( UTF ? SVf_UTF8 : 0 ),
+                                        SVt_PVCV);
                        op_free(pl_yylval.opval);
                        pl_yylval.opval = rv2cv_op;
                        pl_yylval.opval->op_private |= OPpENTERSUB_NOPAREN;
@@ -6857,7 +6908,7 @@ Perl_yylex(pTHX)
                            d = PL_tokenbuf;
                            while (isLOWER(*d))
                                d++;
-                           if (!*d && !gv_stashpv(PL_tokenbuf, 0))
+                           if (!*d && !gv_stashpv(PL_tokenbuf, UTF ? SVf_UTF8 : 0))
                                Perl_warner(aTHX_ packWARN(WARN_RESERVED), PL_warn_reserved,
                                       PL_tokenbuf);
                        }
@@ -6878,31 +6929,43 @@ Perl_yylex(pTHX)
            }
 
        case KEY___FILE__:
-           pl_yylval.opval = (OP*)newSVOP(OP_CONST, 0,
-                                       newSVpv(CopFILE(PL_curcop),0));
-           TERM(THING);
+           FUN0OP(
+               (OP*)newSVOP(OP_CONST, 0, newSVpv(CopFILE(PL_curcop),0))
+           );
 
        case KEY___LINE__:
-            pl_yylval.opval = (OP*)newSVOP(OP_CONST, 0,
-                                    Perl_newSVpvf(aTHX_ "%"IVdf, (IV)CopLINE(PL_curcop)));
-           TERM(THING);
+           FUN0OP(
+               (OP*)newSVOP(OP_CONST, 0,
+                   Perl_newSVpvf(aTHX_ "%"IVdf, (IV)CopLINE(PL_curcop)))
+           );
 
        case KEY___PACKAGE__:
-           pl_yylval.opval = (OP*)newSVOP(OP_CONST, 0,
+           FUN0OP(
+               (OP*)newSVOP(OP_CONST, 0,
                                        (PL_curstash
                                         ? newSVhek(HvNAME_HEK(PL_curstash))
-                                        : &PL_sv_undef));
-           TERM(THING);
+                                        : &PL_sv_undef))
+           );
 
        case KEY___DATA__:
        case KEY___END__: {
            GV *gv;
            if (PL_rsfp && (!PL_in_eval || PL_tokenbuf[2] == 'D')) {
                const char *pname = "main";
+               STRLEN plen = 4;
+               U32 putf8 = 0;
                if (PL_tokenbuf[2] == 'D')
-                   pname = HvNAME_get(PL_curstash ? PL_curstash : PL_defstash);
-               gv = gv_fetchpv(Perl_form(aTHX_ "%s::DATA", pname), GV_ADD,
-                               SVt_PVIO);
+               {
+                   HV * const stash =
+                       PL_curstash ? PL_curstash : PL_defstash;
+                   pname = HvNAME_get(stash);
+                   plen  = HvNAMELEN (stash);
+                   if(HvNAMEUTF8(stash)) putf8 = SVf_UTF8;
+               }
+               gv = gv_fetchpvn_flags(
+                       Perl_form(aTHX_ "%*s::DATA", (int)plen, pname),
+                       plen+6, GV_ADD|putf8, SVt_PVIO
+               );
                GvMULTI_on(gv);
                if (!GvIO(gv))
                    GvIOp(gv) = newIO();
@@ -6936,12 +6999,6 @@ Perl_yylex(pTHX)
 #else
                    if (PerlLIO_setmode(PerlIO_fileno(PL_rsfp), O_TEXT) != -1) {
 #endif /* NETWARE */
-#ifdef PERLIO_IS_STDIO /* really? */
-#  if defined(__BORLANDC__)
-                       /* XXX see note in do_binmode() */
-                       ((FILE*)PL_rsfp)->flags &= ~_F_BIN;
-#  endif
-#endif
                        if (loc > 0)
                            PerlIO_seek(PL_rsfp, loc, 0);
                    }
@@ -7010,11 +7067,12 @@ Perl_yylex(pTHX)
                s += 2;
                d = s;
                s = scan_word(s, PL_tokenbuf, sizeof PL_tokenbuf, FALSE, &len);
-               if (!(tmp = keyword(PL_tokenbuf, len, 0)))
+               if (!(tmp = keyword(PL_tokenbuf, len, 1)))
                    Perl_croak(aTHX_ "CORE::%s is not a keyword", PL_tokenbuf);
                if (tmp < 0)
                    tmp = -tmp;
-               else if (tmp == KEY_require || tmp == KEY_do)
+               else if (tmp == KEY_require || tmp == KEY_do
+                     || tmp == KEY_glob)
                    /* that's a way to remember we saw "CORE::" */
                    orig_keyword = tmp;
                goto reserved_word;
@@ -7054,12 +7112,6 @@ Perl_yylex(pTHX)
            UNI(OP_CHOP);
 
        case KEY_continue:
-           /* When 'use switch' is in effect, continue has a dual
-              life as a control operator. */
-           {
-               if (!FEATURE_IS_ENABLED("switch"))
-                   PREBLOCK(CONTINUE);
-               else {
                    /* We have to disambiguate the two senses of
                      "continue". If the next token is a '{' then
                      treat it as the start of a continue block;
@@ -7070,8 +7122,6 @@ Perl_yylex(pTHX)
            PREBLOCK(CONTINUE);
                    else
                        FUN0(OP_CONTINUE);
-               }
-           }
 
        case KEY_chdir:
            /* may use HOME */
@@ -7374,7 +7424,10 @@ Perl_yylex(pTHX)
            OPERATOR(GIVEN);
 
        case KEY_glob:
-           LOP(OP_GLOB,XTERM);
+           LOP(
+            orig_keyword==KEY_glob ? (orig_keyword=0, -OP_GLOB) : OP_GLOB,
+            XTERM
+           );
 
        case KEY_hex:
            UNI(OP_HEX);
@@ -7608,7 +7661,8 @@ Perl_yylex(pTHX)
                missingterm(NULL);
            PL_expect = XOPERATOR;
            if (SvCUR(PL_lex_stuff)) {
-               int warned = 0;
+               int warned_comma = !ckWARN(WARN_QW);
+               int warned_comment = warned_comma;
                d = SvPV_force(PL_lex_stuff, len);
                while (len) {
                    for (; isSPACE(*d) && len; --len, ++d)
@@ -7616,17 +7670,17 @@ Perl_yylex(pTHX)
                    if (len) {
                        SV *sv;
                        const char *b = d;
-                       if (!warned && ckWARN(WARN_QW)) {
+                       if (!warned_comma || !warned_comment) {
                            for (; !isSPACE(*d) && len; --len, ++d) {
-                               if (*d == ',') {
+                               if (!warned_comma && *d == ',') {
                                    Perl_warner(aTHX_ packWARN(WARN_QW),
                                        "Possible attempt to separate words with commas");
-                                   ++warned;
+                                   ++warned_comma;
                                }
-                               else if (*d == '#') {
+                               else if (!warned_comment && *d == '#') {
                                    Perl_warner(aTHX_ packWARN(WARN_QW),
                                        "Possible attempt to put comments in qw() list");
-                                   ++warned;
+                                   ++warned_comment;
                                }
                            }
                        }
@@ -7685,7 +7739,8 @@ Perl_yylex(pTHX)
                *PL_tokenbuf = '\0';
                s = force_word(s,WORD,TRUE,TRUE,FALSE);
                if (isIDFIRST_lazy_if(PL_tokenbuf,UTF))
-                   gv_stashpvn(PL_tokenbuf, strlen(PL_tokenbuf), GV_ADD);
+                   gv_stashpvn(PL_tokenbuf, strlen(PL_tokenbuf),
+                                GV_ADD | (UTF ? SVf_UTF8 : 0));
                else if (*s == '<')
                    yyerror("<> should be quotes");
            }
@@ -7890,7 +7945,7 @@ Perl_yylex(pTHX)
                SV *tmpwhite = 0;
 
                char *tstart = SvPVX(PL_linestr) + PL_realtokenstart;
-               SV *subtoken = newSVpvn(tstart, s - tstart);
+               SV *subtoken = newSVpvn_flags(tstart, s - tstart, SvUTF8(PL_linestr));
                PL_thistoken = 0;
 
                d = s;
@@ -7913,7 +7968,7 @@ Perl_yylex(pTHX)
                    d = scan_word(s, tmpbuf, sizeof tmpbuf, TRUE, &len);
 #ifdef PERL_MAD
                    if (PL_madskills)
-                       nametoke = newSVpvn(s, d - s);
+                       nametoke = newSVpvn_flags(s, d - s, SvUTF8(PL_linestr));
 #endif
                    if (memchr(tmpbuf, ':', len))
                        sv_setpvn(PL_subname, tmpbuf, len);
@@ -7922,6 +7977,8 @@ Perl_yylex(pTHX)
                        sv_catpvs(PL_subname,"::");
                        sv_catpvn(PL_subname,tmpbuf,len);
                    }
+                    if (SvUTF8(PL_linestr))
+                        SvUTF8_on(PL_subname);
                    have_name = TRUE;
 
 #ifdef PERL_MAD
@@ -7971,21 +8028,22 @@ Perl_yylex(pTHX)
                    bool underscore = FALSE;
                    bool seen_underscore = FALSE;
                    const bool warnillegalproto = ckWARN(WARN_ILLEGALPROTO);
+                    STRLEN tmplen;
 
                    s = scan_str(s,!!PL_madskills,FALSE);
                    if (!s)
                        Perl_croak(aTHX_ "Prototype not terminated");
                    /* strip spaces and check for bad characters */
-                   d = SvPVX(PL_lex_stuff);
+                   d = SvPV(PL_lex_stuff, tmplen);
                    tmp = 0;
-                   for (p = d; *p; ++p) {
+                   for (p = d; tmplen; tmplen--, ++p) {
                        if (!isSPACE(*p)) {
-                           d[tmp++] = *p;
+                            d[tmp++] = *p;
 
                            if (warnillegalproto) {
                                if (must_be_last)
                                    proto_after_greedy_proto = TRUE;
-                               if (!strchr("$@%*;[]&\\_+", *p)) {
+                               if (!strchr("$@%*;[]&\\_+", *p) || *p == '\0') {
                                    bad_proto = TRUE;
                                }
                                else {
@@ -8013,17 +8071,22 @@ Perl_yylex(pTHX)
                            }
                        }
                    }
-                   d[tmp] = '\0';
+                    d[tmp] = '\0';
                    if (proto_after_greedy_proto)
                        Perl_warner(aTHX_ packWARN(WARN_ILLEGALPROTO),
                                    "Prototype after '%c' for %"SVf" : %s",
                                    greedy_proto, SVfARG(PL_subname), d);
-                   if (bad_proto)
+                   if (bad_proto) {
+                        SV *dsv = newSVpvs_flags("", SVs_TEMP);
                        Perl_warner(aTHX_ packWARN(WARN_ILLEGALPROTO),
                                    "Illegal character %sin prototype for %"SVf" : %s",
                                    seen_underscore ? "after '_' " : "",
-                                   SVfARG(PL_subname), d);
-                   SvCUR_set(PL_lex_stuff, tmp);
+                                   SVfARG(PL_subname),
+                                    sv_uni_display(dsv,
+                                         newSVpvn_flags(d, tmp, SVs_TEMP | SvUTF8(PL_lex_stuff)),
+                                         tmp, UNI_DISPLAY_ISPRINT));
+                    }
+                    SvCUR_set(PL_lex_stuff, tmp);
                    have_proto = TRUE;
 
 #ifdef PERL_MAD
@@ -8277,7 +8340,7 @@ S_pending_ident(pTHX)
                 yyerror(Perl_form(aTHX_ "No package name allowed for "
                                   "variable %s in \"our\"",
                                   PL_tokenbuf));
-            tmp = allocmy(PL_tokenbuf, tokenbuf_len, 0);
+            tmp = allocmy(PL_tokenbuf, tokenbuf_len, UTF ? SVf_UTF8 : 0);
         }
         else {
             if (has_colon)
@@ -8285,7 +8348,8 @@ S_pending_ident(pTHX)
                            PL_in_my == KEY_my ? "my" : "state", PL_tokenbuf));
 
             pl_yylval.opval = newOP(OP_PADANY, 0);
-            pl_yylval.opval->op_targ = allocmy(PL_tokenbuf, tokenbuf_len, 0);
+            pl_yylval.opval->op_targ = allocmy(PL_tokenbuf, tokenbuf_len,
+                                                        UTF ? SVf_UTF8 : 0);
             return PRIVATEREF;
         }
     }
@@ -8304,7 +8368,8 @@ S_pending_ident(pTHX)
 
     if (!has_colon) {
        if (!PL_in_my)
-           tmp = pad_findmy(PL_tokenbuf, tokenbuf_len, 0);
+           tmp = pad_findmy_pvn(PL_tokenbuf, tokenbuf_len,
+                                    UTF ? SVf_UTF8 : 0);
         if (tmp != NOT_IN_PAD) {
             /* might be an "our" variable" */
             if (PAD_COMPNAME_FLAGS_isOUR(tmp)) {
@@ -8313,7 +8378,7 @@ S_pending_ident(pTHX)
                HEK * const stashname = HvNAME_HEK(stash);
                SV *  const sym = newSVhek(stashname);
                 sv_catpvs(sym, "::");
-                sv_catpvn(sym, PL_tokenbuf+1, tokenbuf_len - 1);
+                sv_catpvn_flags(sym, PL_tokenbuf+1, tokenbuf_len - 1, (UTF ? SV_CATUTF8 : SV_CATBYTES ));
                 pl_yylval.opval = (OP*)newSVOP(OP_CONST, 0, sym);
                 pl_yylval.opval->op_private = OPpCONST_ENTERED;
                 gv_fetchsv(sym,
@@ -8357,8 +8422,8 @@ S_pending_ident(pTHX)
     */
     if (ckWARN(WARN_AMBIGUOUS) &&
        pit == '@' && PL_lex_state != LEX_NORMAL && !PL_lex_brackets) {
-        GV *const gv = gv_fetchpvn_flags(PL_tokenbuf + 1, tokenbuf_len - 1, 0,
-                                        SVt_PVAV);
+        GV *const gv = gv_fetchpvn_flags(PL_tokenbuf + 1, tokenbuf_len - 1,
+                                        ( UTF ? SVf_UTF8 : 0 ), SVt_PVAV);
         if ((!gv || ((PL_tokenbuf[0] == '@') ? !GvAV(gv) : !GvHV(gv)))
                /* DO NOT warn for @- and @+ */
                && !( PL_tokenbuf[2] == '\0' &&
@@ -8373,11 +8438,13 @@ S_pending_ident(pTHX)
     }
 
     /* build ops for a bareword */
-    pl_yylval.opval = (OP*)newSVOP(OP_CONST, 0, newSVpvn(PL_tokenbuf + 1,
-                                                     tokenbuf_len - 1));
+    pl_yylval.opval = (OP*)newSVOP(OP_CONST, 0, newSVpvn_flags(PL_tokenbuf + 1,
+                                                     tokenbuf_len - 1,
+                                                      UTF ? SVf_UTF8 : 0 ));
     pl_yylval.opval->op_private = OPpCONST_ENTERED;
     gv_fetchpvn_flags(PL_tokenbuf+1, tokenbuf_len - 1,
-                    PL_in_eval ? (GV_ADDMULTI | GV_ADDINEVAL) : GV_ADD,
+                    (PL_in_eval ? (GV_ADDMULTI | GV_ADDINEVAL) : GV_ADD)
+                     | ( UTF ? SVf_UTF8 : 0 ),
                     ((PL_tokenbuf[0] == '$') ? SVt_PV
                      : (PL_tokenbuf[0] == '@') ? SVt_PVAV
                      : SVt_PVHV));
@@ -8429,7 +8496,7 @@ S_checkcomma(pTHX_ const char *s, const char *name, const char *what)
            if (keyword(w, s - w, 0))
                return;
 
-           gv = gv_fetchpvn_flags(w, s - w, 0, SVt_PVCV);
+           gv = gv_fetchpvn_flags(w, s - w, ( UTF ? SVf_UTF8 : 0 ), SVt_PVCV);
            if (gv && GvCVu(gv))
                return;
            Perl_croak(aTHX_ "No comma allowed after %s", what);
@@ -8658,9 +8725,19 @@ S_scan_ident(pTHX_ register char *s, register const char *send, char *dest, STRL
     }
     else if (ck_uni)
        check_uni();
-    if (s < send)
-       *d = *s++;
-    d[1] = '\0';
+    if (s < send) {
+        if (UTF) {
+            const STRLEN skip = UTF8SKIP(s);
+            STRLEN i;
+            d[skip] = '\0';
+            for ( i = 0; i < skip; i++ )
+                d[i] = *s++;
+        }
+        else {
+            *d = *s++;
+            d[1] = '\0';
+        }
+    }
     if (*d == '^' && *s && isCONTROLVAR(*s)) {
        *d = toCTRL(*s);
        s++;
@@ -8676,7 +8753,7 @@ S_scan_ident(pTHX_ register char *s, register const char *send, char *dest, STRL
            }
        }
        if (isIDFIRST_lazy_if(d,UTF)) {
-           d++;
+           d += UTF8SKIP(d);
            if (UTF) {
                char *end = s;
                while ((end < send && isALNUM_lazy_if(end,UTF)) || *end == ':') {
@@ -8756,13 +8833,17 @@ S_scan_ident(pTHX_ register char *s, register const char *send, char *dest, STRL
 }
 
 static bool
-S_pmflag(pTHX_ const char* const valid_flags, U32 * pmfl, char** s) {
+S_pmflag(pTHX_ const char* const valid_flags, U32 * pmfl, char** s, char* charset) {
 
     /* Adds, subtracts to/from 'pmfl' based on regex modifier flags found in
      * the parse starting at 's', based on the subset that are valid in this
      * context input to this routine in 'valid_flags'. Advances s.  Returns
      * TRUE if the input was a valid flag, so the next char may be as well;
-     * otherwise FALSE */
+     * otherwise FALSE. 'charset' should point to a NUL upon first call on the
+     * current regex.  This routine will set it to any charset modifier found.
+     * The caller shouldn't change it.  This way, another charset modifier
+     * encountered in the parse can be detected as an error, as we have decided
+     * allow only one */
 
     const char c = **s;
 
@@ -8810,7 +8891,11 @@ S_pmflag(pTHX_ const char* const valid_flags, U32 * pmfl, char** s) {
                    "Ambiguous use of 's//le...' resolved as 's// le...'; Rewrite as 's//el' if you meant 'use locale rules and evaluate rhs as an expression'.  In Perl 5.16, it will be resolved the other way");
                return FALSE;
            }
+           if (*charset) {
+               goto multiple_charsets;
+           }
            set_regex_charset(pmfl, REGEX_LOCALE_CHARSET);
+           *charset = c;
            break;
        case UNICODE_PAT_MOD:
            /* In 5.14, qr//unless and qr//until are legal but deprecated; the
@@ -8818,7 +8903,11 @@ S_pmflag(pTHX_ const char* const valid_flags, U32 * pmfl, char** s) {
            if (*((*s) + 1) == 'n') {
                goto deprecate;
            }
+           if (*charset) {
+               goto multiple_charsets;
+           }
            set_regex_charset(pmfl, REGEX_UNICODE_CHARSET);
+           *charset = c;
            break;
        case ASCII_RESTRICT_PAT_MOD:
            /* In 5.14, qr//and is legal but deprecated; the 'n' means they
@@ -8826,17 +8915,30 @@ S_pmflag(pTHX_ const char* const valid_flags, U32 * pmfl, char** s) {
            if (*((*s) + 1) == 'n') {
                goto deprecate;
            }
-           if (*((*s) + 1) == ASCII_RESTRICT_PAT_MOD) {
-               /* Doubled modifier implies more restricted */
-               set_regex_charset(pmfl, REGEX_ASCII_MORE_RESTRICTED_CHARSET);
-               (*s)++;
+
+           if (! *charset) {
+               set_regex_charset(pmfl, REGEX_ASCII_RESTRICTED_CHARSET);
            }
            else {
-               set_regex_charset(pmfl, REGEX_ASCII_RESTRICTED_CHARSET);
+
+               /* Error if previous modifier wasn't an 'a', but if it was, see
+                * if, and accept, a second occurrence (only) */
+               if (*charset != 'a'
+                   || get_regex_charset(*pmfl)
+                       != REGEX_ASCII_RESTRICTED_CHARSET)
+               {
+                       goto multiple_charsets;
+               }
+               set_regex_charset(pmfl, REGEX_ASCII_MORE_RESTRICTED_CHARSET);
            }
+           *charset = c;
            break;
        case DEPENDS_PAT_MOD:
+           if (*charset) {
+               goto multiple_charsets;
+           }
            set_regex_charset(pmfl, REGEX_DEPENDS_CHARSET);
+           *charset = c;
            break;
     }
 
@@ -8847,6 +8949,21 @@ S_pmflag(pTHX_ const char* const valid_flags, U32 * pmfl, char** s) {
        Perl_ck_warner_d(aTHX_ packWARN(WARN_SYNTAX),
            "Having no space between pattern and following word is deprecated");
         return FALSE;
+
+    multiple_charsets:
+       if (*charset != c) {
+           yyerror(Perl_form(aTHX_ "Regexp modifiers \"/%c\" and \"/%c\" are mutually exclusive", *charset, c));
+       }
+       else if (c == 'a') {
+           yyerror("Regexp modifier \"/a\" may appear a maximum of twice");
+       }
+       else {
+           yyerror(Perl_form(aTHX_ "Regexp modifier \"/%c\" may not appear twice", c));
+       }
+
+       /* Pretend that it worked, so will continue processing before dieing */
+       (*s)++;
+       return TRUE;
 }
 
 STATIC char *
@@ -8857,6 +8974,7 @@ S_scan_pat(pTHX_ char *start, I32 type)
     char *s = scan_str(start,!!PL_madskills,FALSE);
     const char * const valid_flags =
        (const char *)((type == OP_QR) ? QR_PAT_MODS : M_PAT_MODS);
+    char charset = '\0';    /* character set modifier */
 #ifdef PERL_MAD
     char *modstart;
 #endif
@@ -8898,7 +9016,7 @@ S_scan_pat(pTHX_ char *start, I32 type)
 #ifdef PERL_MAD
     modstart = s;
 #endif
-    while (*s && S_pmflag(aTHX_ valid_flags, &(pm->op_pmflags), &s)) {};
+    while (*s && S_pmflag(aTHX_ valid_flags, &(pm->op_pmflags), &s, &charset)) {};
 #ifdef PERL_MAD
     if (PL_madskills && modstart != s) {
        SV* tmptoken = newSVpvn(modstart, s - modstart);
@@ -8925,6 +9043,7 @@ S_scan_subst(pTHX_ char *start)
     register PMOP *pm;
     I32 first_start;
     I32 es = 0;
+    char charset = '\0';    /* character set modifier */
 #ifdef PERL_MAD
     char *modstart;
 #endif
@@ -8977,7 +9096,8 @@ S_scan_subst(pTHX_ char *start)
            s++;
            es++;
        }
-       else if (! S_pmflag(aTHX_ S_PAT_MODS, &(pm->op_pmflags), &s)) {
+       else if (! S_pmflag(aTHX_ S_PAT_MODS, &(pm->op_pmflags), &s, &charset))
+       {
            break;
        }
     }
@@ -9355,6 +9475,7 @@ S_scan_heredoc(pTHX_ register char *s)
        if (*s == term && memEQ(s,PL_tokenbuf,len)) {
            STRLEN off = PL_bufend - 1 - SvPVX_const(PL_linestr);
            *(SvPVX(PL_linestr) + off ) = ' ';
+           lex_grow_linestr(SvCUR(PL_linestr) + SvCUR(herewas) + 1);
            sv_catsv(PL_linestr,herewas);
            PL_bufend = SvPVX(PL_linestr) + SvCUR(PL_linestr);
            s = SvPVX(PL_linestr) + off; /* In case PV of PL_linestr moved. */
@@ -9437,7 +9558,7 @@ S_scan_inputsymbol(pTHX_ char *start)
 
     /* allow <Pkg'VALUE> or <Pkg::VALUE> */
     while (*d && (isALNUM_lazy_if(d,UTF) || *d == '\'' || *d == ':'))
-       d++;
+       d += UTF ? UTF8SKIP(d) : 1;
 
     /* If we've tried to read what we allow filehandles to look like, and
        there's still text left, then it must be a glob() and not a getline.
@@ -9480,7 +9601,7 @@ S_scan_inputsymbol(pTHX_ char *start)
            /* try to find it in the pad for this block, otherwise find
               add symbol table ops
            */
-           const PADOFFSET tmp = pad_findmy(d, len, 0);
+           const PADOFFSET tmp = pad_findmy_pvn(d, len, UTF ? SVf_UTF8 : 0);
            if (tmp != NOT_IN_PAD) {
                if (PAD_COMPNAME_FLAGS_isOUR(tmp)) {
                    HV * const stash = PAD_COMPNAME_OURSTASH(tmp);
@@ -9508,7 +9629,7 @@ intro_sym:
                gv = gv_fetchpv(d,
                                (PL_in_eval
                                 ? (GV_ADDMULTI | GV_ADDINEVAL)
-                                : GV_ADDMULTI),
+                                : GV_ADDMULTI) | ( UTF ? SVf_UTF8 : 0 ),
                                SVt_PV);
                PL_lex_op = readline_overriden
                    ? (OP*)newUNOP(OP_ENTERSUB, OPf_STACKED,
@@ -9528,7 +9649,7 @@ intro_sym:
        /* If it's none of the above, it must be a literal filehandle
           (<Foo::BAR> or <FOO>) so build a simple readline OP */
        else {
-           GV * const gv = gv_fetchpv(d, GV_ADD, SVt_PVIO);
+           GV * const gv = gv_fetchpv(d, GV_ADD | ( UTF ? SVf_UTF8 : 0 ), SVt_PVIO);
            PL_lex_op = readline_overriden
                ? (OP*)newUNOP(OP_ENTERSUB, OPf_STACKED,
                        op_append_elem(OP_LIST,