This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
arrange for next() to resume at the unstack op rather than the
[perl5.git] / op.c
diff --git a/op.c b/op.c
index fb696a7..64b8006 100644 (file)
--- a/op.c
+++ b/op.c
@@ -1,6 +1,6 @@
 /*    op.c
  *
- *    Copyright (c) 1991-1999, Larry Wall
+ *    Copyright (c) 1991-2000, Larry Wall
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
 
 /* #define PL_OP_SLAB_ALLOC */
 
-/* XXXXXX testing */
-#ifdef USE_ITHREADS
-#  define OP_REFCNT_LOCK               NOOP
-#  define OP_REFCNT_UNLOCK             NOOP
-#  define OpREFCNT_set(o,n)            ((o)->op_targ = (n))
-#  define OpREFCNT_dec(o)              (--(o)->op_targ)
-#else
-#  define OP_REFCNT_LOCK               NOOP
-#  define OP_REFCNT_UNLOCK             NOOP
-#  define OpREFCNT_set(o,n)            NOOP
-#  define OpREFCNT_dec(o)              0
-#endif
-
 #ifdef PL_OP_SLAB_ALLOC 
 #define SLAB_SIZE 8192
 static char    *PL_OpPtr  = NULL;
@@ -124,11 +111,10 @@ Perl_pad_allocmy(pTHX_ char *name)
     PADOFFSET off;
     SV *sv;
 
-    if (!(
-       PL_in_my == KEY_our ||
-       isALPHA(name[1]) ||
-       (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
-       name[1] == '_' && (int)strlen(name) > 2 ))
+    if (!(PL_in_my == KEY_our ||
+         isALPHA(name[1]) ||
+         (PL_hints & HINT_UTF8 && (name[1] & 0xc0) == 0xc0) ||
+         (name[1] == '_' && (int)strlen(name) > 2)))
     {
        if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
            /* 1999-02-27 mjd@plover.com */
@@ -151,7 +137,7 @@ Perl_pad_allocmy(pTHX_ char *name)
        }
        yyerror(Perl_form(aTHX_ "Can't use global %s in \"my\"",name));
     }
-    if (ckWARN(WARN_UNSAFE) && AvFILLp(PL_comppad_name) >= 0) {
+    if (ckWARN(WARN_MISC) && AvFILLp(PL_comppad_name) >= 0) {
        SV **svp = AvARRAY(PL_comppad_name);
        HV *ourstash = (PL_curstash ? PL_curstash : PL_defstash);
        PADOFFSET top = AvFILLp(PL_comppad_name);
@@ -163,7 +149,7 @@ Perl_pad_allocmy(pTHX_ char *name)
                    || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash))
                && strEQ(name, SvPVX(sv)))
            {
-               Perl_warner(aTHX_ WARN_UNSAFE,
+               Perl_warner(aTHX_ WARN_MISC,
                    "\"%s\" variable %s masks earlier declaration in same %s", 
                    (PL_in_my == KEY_our ? "our" : "my"),
                    name,
@@ -173,20 +159,19 @@ Perl_pad_allocmy(pTHX_ char *name)
            }
        }
        if (PL_in_my == KEY_our) {
-           while (off >= 0 && off <= top) {
+           do {
                if ((sv = svp[off])
                    && sv != &PL_sv_undef
                    && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)
                    && strEQ(name, SvPVX(sv)))
                {
-                   Perl_warner(aTHX_ WARN_UNSAFE,
+                   Perl_warner(aTHX_ WARN_MISC,
                        "\"our\" variable %s redeclared", name);
-                   Perl_warner(aTHX_ WARN_UNSAFE,
-                       "(Did you mean \"local\" instead of \"our\"?)\n");
+                   Perl_warner(aTHX_ WARN_MISC,
+                       "\t(Did you mean \"local\" instead of \"our\"?)\n");
                    break;
                }
-               --off;
-           }
+           } while ( off-- > 0 );
        }
     }
     off = pad_alloc(OP_PADSV, SVs_PADMY);
@@ -204,7 +189,7 @@ Perl_pad_allocmy(pTHX_ char *name)
     }
     if (PL_in_my == KEY_our) {
        (void)SvUPGRADE(sv, SVt_PVGV);
-       GvSTASH(sv) = (HV*)SvREFCNT_inc(PL_curstash ? PL_curstash : PL_defstash);
+       GvSTASH(sv) = (HV*)SvREFCNT_inc(PL_curstash ? (SV*)PL_curstash : (SV*)PL_defstash);
        SvFLAGS(sv) |= SVpad_OUR;
     }
     av_store(PL_comppad_name, off, sv);
@@ -370,8 +355,9 @@ S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv,
                if (CxREALEVAL(cx))
                    saweval = i;
                break;
+           case OP_DOFILE:
            case OP_REQUIRE:
-               /* require must have its own scope */
+               /* require/do must have their own scope */
                return 0;
            }
            break;
@@ -976,7 +962,7 @@ Perl_scalar(pTHX_ OP *o)
     case OP_LEAVETRY:
        kid = cLISTOPo->op_first;
        scalar(kid);
-       while (kid = kid->op_sibling) {
+       while ((kid = kid->op_sibling)) {
            if (kid->op_sibling)
                scalarvoid(kid);
            else
@@ -1269,7 +1255,7 @@ Perl_list(pTHX_ OP *o)
     case OP_LEAVETRY:
        kid = cLISTOPo->op_first;
        list(kid);
-       while (kid = kid->op_sibling) {
+       while ((kid = kid->op_sibling)) {
            if (kid->op_sibling)
                scalarvoid(kid);
            else
@@ -1339,7 +1325,6 @@ Perl_mod(pTHX_ OP *o, I32 type)
 {
     dTHR;
     OP *kid;
-    SV *sv;
     STRLEN n_a;
 
     if (!o || PL_error_count)
@@ -1412,18 +1397,19 @@ Perl_mod(pTHX_ OP *o, I32 type)
                    if (kid->op_type == OP_METHOD_NAMED
                        || kid->op_type == OP_METHOD)
                    {
-                       OP *newop;
+                       UNOP *newop;
 
                        if (kid->op_sibling || kid->op_next != kid) {
                            yyerror("panic: unexpected optree near method call");
                            break;
                        }
                        
-                       NewOp(1101, newop, 1, OP);
+                       NewOp(1101, newop, 1, UNOP);
                        newop->op_type = OP_RV2CV;
                        newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
-                       newop->op_next = newop;
-                       kid->op_sibling = newop;
+                       newop->op_first = Nullop;
+                        newop->op_next = (OP*)newop;
+                       kid->op_sibling = (OP*)newop;
                        newop->op_private |= OPpLVAL_INTRO;
                        break;
                    }
@@ -1835,7 +1821,6 @@ S_dup_attrlist(pTHX_ OP *o)
 STATIC void
 S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs)
 {
-    OP *modname;       /* for 'use' */
     SV *stashsv;
 
     /* fake up C<use attributes $pkg,$rv,@attrs> */
@@ -1845,19 +1830,18 @@ S_apply_attrs(pTHX_ HV *stash, SV *target, OP *attrs)
        stashsv = newSVpv(HvNAME(stash), 0);
     else
        stashsv = &PL_sv_no;
+
 #define ATTRSMODULE "attributes"
-    modname = newSVOP(OP_CONST, 0,
-                     newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1));
-    modname->op_private |= OPpCONST_BARE;
-    /* that flag is required to make 'use' work right */
-    utilize(1, start_subparse(FALSE, 0),
-           Nullop, /* version */
-           modname,
-           prepend_elem(OP_LIST,
-                        newSVOP(OP_CONST, 0, stashsv),
-                        prepend_elem(OP_LIST,
-                                     newSVOP(OP_CONST, 0, newRV(target)),
-                                     dup_attrlist(attrs))));
+
+    Perl_load_module(aTHX_ PERL_LOADMOD_IMPORT_OPS,
+                    newSVpvn(ATTRSMODULE, sizeof(ATTRSMODULE)-1),
+                    Nullsv,
+                    prepend_elem(OP_LIST,
+                                 newSVOP(OP_CONST, 0, stashsv),
+                                 prepend_elem(OP_LIST,
+                                              newSVOP(OP_CONST, 0,
+                                                      newRV(target)),
+                                              dup_attrlist(attrs))));
     LEAVE;
 }
 
@@ -1946,7 +1930,7 @@ Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
     dTHR;
     OP *o;
 
-    if (ckWARN(WARN_UNSAFE) &&
+    if (ckWARN(WARN_MISC) &&
       (left->op_type == OP_RV2AV ||
        left->op_type == OP_RV2HV ||
        left->op_type == OP_PADAV ||
@@ -1957,7 +1941,7 @@ Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
       const char *sample = ((left->op_type == OP_RV2AV ||
                             left->op_type == OP_PADAV)
                            ? "@array" : "%hash");
-      Perl_warner(aTHX_ WARN_UNSAFE,
+      Perl_warner(aTHX_ WARN_MISC,
              "Applying %s to %s will act on scalar(%s)", 
              desc, sample, sample);
     }
@@ -2354,8 +2338,11 @@ Perl_append_elem(pTHX_ I32 type, OP *first, OP *last)
     if (!last)
        return first;
 
-    if (first->op_type != type || type==OP_LIST && first->op_flags & OPf_PARENS)
-           return newLISTOP(type, 0, first, last);
+    if (first->op_type != type
+       || (type == OP_LIST && (first->op_flags & OPf_PARENS)))
+    {
+       return newLISTOP(type, 0, first, last);
+    }
 
     if (first->op_flags & OPf_KIDS)
        ((LISTOP*)first)->op_last->op_sibling = last;
@@ -2601,12 +2588,11 @@ Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
        I32 grows = 0;
        I32 havefinal = 0;
        U32 final;
-       HV *hv;
        I32 from_utf    = o->op_private & OPpTRANS_FROM_UTF;
        I32 to_utf      = o->op_private & OPpTRANS_TO_UTF;
 
        if (complement) {
-           U8 tmpbuf[10];
+           U8 tmpbuf[UTF8_MAXLEN];
            U8** cp;
            UV nextmin = 0;
            New(1109, cp, tlen, U8*);
@@ -2760,7 +2746,8 @@ Perl_pmtrans(pTHX_ OP *o, OP *expr, OP *repl)
            SvREFCNT_dec(transv);
 
        if (!del && havefinal)
-           (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5, newSViv((IV)final), 0);
+           (void)hv_store((HV*)SvRV((cSVOPo->op_sv)), "FINAL", 5,
+                          newSVuv((UV)final), 0);
 
        if (grows && to_utf)
            o->op_private |= OPpTRANS_GROWS;
@@ -3094,7 +3081,6 @@ void
 Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
 {
     OP *pack;
-    OP *meth;
     OP *rqop;
     OP *imop;
     OP *veop;
@@ -3105,45 +3091,55 @@ Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
 
     veop = Nullop;
 
-    if(version != Nullop) {
+    if (version != Nullop) {
        SV *vesv = ((SVOP*)version)->op_sv;
 
-       if (arg == Nullop && !SvNIOK(vesv)) {
+       if (arg == Nullop && !SvNIOKp(vesv)) {
            arg = version;
        }
        else {
            OP *pack;
+           SV *meth;
 
-           if (version->op_type != OP_CONST || !SvNIOK(vesv))
+           if (version->op_type != OP_CONST || !SvNIOKp(vesv))
                Perl_croak(aTHX_ "Version number must be constant number");
 
            /* Make copy of id so we don't free it twice */
            pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
 
            /* Fake up a method call to VERSION */
+           meth = newSVpvn("VERSION",7);
+           sv_upgrade(meth, SVt_PVIV);
+           (void)SvIOK_on(meth);
+           PERL_HASH(SvUVX(meth), SvPVX(meth), SvCUR(meth));
            veop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
                            append_elem(OP_LIST,
-                           prepend_elem(OP_LIST, pack, list(version)),
-                           newSVOP(OP_METHOD_NAMED, 0,
-                                   newSVpvn("VERSION", 7))));
+                                       prepend_elem(OP_LIST, pack, list(version)),
+                                       newSVOP(OP_METHOD_NAMED, 0, meth)));
        }
     }
 
     /* Fake up an import/unimport */
     if (arg && arg->op_type == OP_STUB)
        imop = arg;             /* no import on explicit () */
-    else if(SvNIOK(((SVOP*)id)->op_sv)) {
+    else if (SvNIOKp(((SVOP*)id)->op_sv)) {
        imop = Nullop;          /* use 5.0; */
     }
     else {
+       SV *meth;
+
        /* Make copy of id so we don't free it twice */
        pack = newSVOP(OP_CONST, 0, newSVsv(((SVOP*)id)->op_sv));
+
+       /* Fake up a method call to import/unimport */
+       meth = aver ? newSVpvn("import",6) : newSVpvn("unimport", 8);;
+       sv_upgrade(meth, SVt_PVIV);
+       (void)SvIOK_on(meth);
+       PERL_HASH(SvUVX(meth), SvPVX(meth), SvCUR(meth));
        imop = convert(OP_ENTERSUB, OPf_STACKED|OPf_SPECIAL,
-                   append_elem(OP_LIST,
-                       prepend_elem(OP_LIST, pack, list(arg)),
-                       newSVOP(OP_METHOD_NAMED, 0,
-                               aver ? newSVpvn("import", 6)
-                                    : newSVpvn("unimport", 8))));
+                      append_elem(OP_LIST,
+                                  prepend_elem(OP_LIST, pack, list(arg)),
+                                  newSVOP(OP_METHOD_NAMED, 0, meth)));
     }
 
     /* Fake up a require, handle override, if any */
@@ -3178,6 +3174,58 @@ Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
     PL_expect = XSTATE;
 }
 
+void
+Perl_load_module(pTHX_ U32 flags, SV *name, SV *ver, ...)
+{
+    va_list args;
+    va_start(args, ver);
+    vload_module(flags, name, ver, &args);
+    va_end(args);
+}
+
+#ifdef PERL_IMPLICIT_CONTEXT
+void
+Perl_load_module_nocontext(U32 flags, SV *name, SV *ver, ...)
+{
+    dTHX;
+    va_list args;
+    va_start(args, ver);
+    vload_module(flags, name, ver, &args);
+    va_end(args);
+}
+#endif
+
+void
+Perl_vload_module(pTHX_ U32 flags, SV *name, SV *ver, va_list *args)
+{
+    OP *modname, *veop, *imop;
+
+    modname = newSVOP(OP_CONST, 0, name);
+    modname->op_private |= OPpCONST_BARE;
+    if (ver) {
+       veop = newSVOP(OP_CONST, 0, ver);
+    }
+    else
+       veop = Nullop;
+    if (flags & PERL_LOADMOD_NOIMPORT) {
+       imop = sawparens(newNULLLIST());
+    }
+    else if (flags & PERL_LOADMOD_IMPORT_OPS) {
+       imop = va_arg(*args, OP*);
+    }
+    else {
+       SV *sv;
+       imop = Nullop;
+       sv = va_arg(*args, SV*);
+       while (sv) {
+           imop = append_elem(OP_LIST, imop, newSVOP(OP_CONST, 0, sv));
+           sv = va_arg(*args, SV*);
+       }
+    }
+    utilize(!(flags & PERL_LOADMOD_DENY), start_subparse(FALSE, 0),
+           veop, modname, imop);
+}
+
 OP *
 Perl_dofile(pTHX_ OP *term)
 {
@@ -3262,6 +3310,8 @@ Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
 
     if (list_assignment(left)) {
        dTHR;
+       OP *curop;
+
        PL_modcount = 0;
        PL_eval_start = right;  /* Grandfathering $[ assignment here.  Bletch.*/
        left = mod(left, OP_AASSIGN);
@@ -3272,12 +3322,19 @@ Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
            op_free(right);
            return Nullop;
        }
-       o = newBINOP(OP_AASSIGN, flags,
-               list(force_list(right)),
-               list(force_list(left)) );
+       curop = list(force_list(left));
+       o = newBINOP(OP_AASSIGN, flags, list(force_list(right)), curop);
        o->op_private = 0 | (flags >> 8);
+       for (curop = ((LISTOP*)curop)->op_first;
+            curop; curop = curop->op_sibling)
+       {
+           if (curop->op_type == OP_RV2HV &&
+               ((UNOP*)curop)->op_first->op_type != OP_GV) {
+               o->op_private |= OPpASSIGN_HASH;
+               break;
+           }
+       }
        if (!(left->op_private & OPpLVAL_INTRO)) {
-           OP *curop;
            OP *lastop = o;
            PL_generation++;
            for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
@@ -3321,7 +3378,7 @@ Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
                lastop = curop;
            }
            if (curop != o)
-               o->op_private = OPpASSIGN_COMMON;
+               o->op_private |= OPpASSIGN_COMMON;
        }
        if (right && right->op_type == OP_SPLIT) {
            OP* tmpop;
@@ -3504,9 +3561,8 @@ S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
        }
     }
     if (first->op_type == OP_CONST) {
-       if (ckWARN(WARN_PRECEDENCE) && (first->op_private & OPpCONST_BARE))
-           Perl_warner(aTHX_ WARN_PRECEDENCE, "Probable precedence problem on %s", 
-                       PL_op_desc[type]);
+       if (ckWARN(WARN_BAREWORD) && (first->op_private & OPpCONST_BARE))
+           Perl_warner(aTHX_ WARN_BAREWORD, "Bareword found in conditional"); 
        if ((type == OP_AND) == (SvTRUE(((SVOP*)first)->op_sv))) {
            op_free(first);
            *firstp = Nullop;
@@ -3524,7 +3580,7 @@ S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
        else
            scalar(other);
     }
-    else if (ckWARN(WARN_UNSAFE) && (first->op_flags & OPf_KIDS)) {
+    else if (ckWARN(WARN_MISC) && (first->op_flags & OPf_KIDS)) {
        OP *k1 = ((UNOP*)first)->op_first;
        OP *k2 = k1->op_sibling;
        OPCODE warnop = 0;
@@ -3553,7 +3609,7 @@ S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
        if (warnop) {
            line_t oldline = CopLINE(PL_curcop);
            CopLINE_set(PL_curcop, PL_copline);
-           Perl_warner(aTHX_ WARN_UNSAFE,
+           Perl_warner(aTHX_ WARN_MISC,
                 "Value of %s%s can be \"0\"; test with defined()",
                 PL_op_desc[warnop],
                 ((warnop == OP_READLINE || warnop == OP_GLOB)
@@ -3754,6 +3810,7 @@ Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *
     OP *listop;
     OP *o;
     OP *condop;
+    U8 loopflags = 0;
 
     if (expr && (expr->op_type == OP_READLINE || expr->op_type == OP_GLOB
                 || (expr->op_type == OP_NULL && expr->op_targ == OP_GLOB))) {
@@ -3786,10 +3843,15 @@ Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *
        block = scope(block);
     }
 
-    if (cont)
+    if (cont) {
        next = LINKLIST(cont);
+       loopflags |= OPpLOOP_CONTINUE;
+    }
     if (expr) {
-       cont = append_elem(OP_LINESEQ, cont, newOP(OP_UNSTACK, 0));
+       OP *unstack = newOP(OP_UNSTACK, 0);
+       if (!next)
+           next = unstack;
+       cont = append_elem(OP_LINESEQ, cont, unstack);
        if ((line_t)whileline != NOLINE) {
            PL_copline = whileline;
            cont = append_elem(OP_LINESEQ, cont,
@@ -3812,8 +3874,6 @@ Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *
        if (listop)
            ((LISTOP*)listop)->op_last->op_next = condop =
                (o == listop ? redo : LINKLIST(o));
-       if (!next)
-           next = condop;
     }
     else
        o = listop;
@@ -3830,6 +3890,7 @@ Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *
 
     loop->op_redoop = redo;
     loop->op_lastop = o;
+    o->op_private |= loopflags;
 
     if (next)
        loop->op_nextop = next;
@@ -3845,7 +3906,6 @@ OP *
 Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *block,OP *cont)
 {
     LOOP *loop;
-    LOOP *tmp;
     OP *wop;
     int padoff = 0;
     I32 iterflags = 0;
@@ -3920,9 +3980,12 @@ Perl_newFOROP(pTHX_ I32 flags,char *label,line_t forline,OP *sv,OP *expr,OP *blo
                               append_elem(OP_LIST, expr, scalar(sv))));
     assert(!loop->op_next);
 #ifdef PL_OP_SLAB_ALLOC
-    NewOp(1234,tmp,1,LOOP);
-    Copy(loop,tmp,1,LOOP);
-    loop = tmp;
+    {
+       LOOP *tmp;
+       NewOp(1234,tmp,1,LOOP);
+       Copy(loop,tmp,1,LOOP);
+       loop = tmp;
+    }
 #else
     Renew(loop, 1, LOOP);
 #endif 
@@ -4090,9 +4153,8 @@ S_cv_clone2(pTHX_ CV *proto, CV *outside)
 
     cv = PL_compcv = (CV*)NEWSV(1104,0);
     sv_upgrade((SV *)cv, SvTYPE(proto));
+    CvFLAGS(cv) = CvFLAGS(proto) & ~CVf_CLONE;
     CvCLONED_on(cv);
-    if (CvANON(proto))
-       CvANON_on(cv);
 
 #ifdef USE_THREADS
     New(666, CvMUTEXP(cv), 1, perl_mutex);
@@ -4214,7 +4276,7 @@ Perl_cv_ckproto(pTHX_ CV *cv, GV *gv, char *p)
 {
     dTHR;
 
-    if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) && ckWARN_d(WARN_UNSAFE)) {
+    if (((!p != !SvPOK(cv)) || (p && strNE(p, SvPVX(cv)))) && ckWARN_d(WARN_PROTOTYPE)) {
        SV* msg = sv_newmortal();
        SV* name = Nullsv;
 
@@ -4230,7 +4292,7 @@ Perl_cv_ckproto(pTHX_ CV *cv, GV *gv, char *p)
            Perl_sv_catpvf(aTHX_ msg, "(%s)", p);
        else
            sv_catpv(msg, "none");
-       Perl_warner(aTHX_ WARN_UNSAFE, "%"SVf, msg);
+       Perl_warner(aTHX_ WARN_PROTOTYPE, "%"SVf, msg);
     }
 }
 
@@ -4247,10 +4309,10 @@ Perl_op_const_sv(pTHX_ OP *o, CV *cv)
 {
     SV *sv = Nullsv;
 
-    if(!o)
+    if (!o)
        return Nullsv;
  
-    if(o->op_type == OP_LINESEQ && cLISTOPo->op_first) 
+    if (o->op_type == OP_LINESEQ && cLISTOPo->op_first) 
        o = cLISTOPo->op_first->op_sibling;
 
     for (; o; o = o->op_next) {
@@ -4336,9 +4398,9 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
                                           maximum a prototype before. */
        if (SvTYPE(gv) > SVt_NULL) {
            if (!SvPOK((SV*)gv) && !(SvIOK((SV*)gv) && SvIVX((SV*)gv) == -1)
-               && ckWARN_d(WARN_UNSAFE))
+               && ckWARN_d(WARN_PROTOTYPE))
            {
-               Perl_warner(aTHX_ WARN_UNSAFE, "Runaway prototype");
+               Perl_warner(aTHX_ WARN_PROTOTYPE, "Runaway prototype");
            }
            cv_ckproto((CV*)gv, NULL, ps);
        }
@@ -4354,7 +4416,7 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
 
     if (!name || GvCVGEN(gv))
        cv = Nullcv;
-    else if (cv = GvCV(gv)) {
+    else if ((cv = GvCV(gv))) {
        cv_ckproto(cv, gv, ps);
        /* already defined (or promised)? */
        if (CvROOT(cv) || CvXSUB(cv) || GvASSUMECV(gv)) {
@@ -4370,13 +4432,9 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
                Perl_croak(aTHX_ "Can't redefine active sort subroutine %s", name);
            if (!block)
                goto withattrs;
-           if(const_sv = cv_const_sv(cv))
+           if ((const_sv = cv_const_sv(cv)))
                const_changed = sv_cmp(const_sv, op_const_sv(block, Nullcv));
-           if ((const_sv && const_changed) || ckWARN(WARN_REDEFINE) 
-                                       && !(CvGV(cv) && GvSTASH(CvGV(cv))
-                                       && HvNAME(GvSTASH(CvGV(cv)))
-                                       && strEQ(HvNAME(GvSTASH(CvGV(cv))),
-                                                "autouse")))
+           if ((const_sv || const_changed) && ckWARN(WARN_REDEFINE))
            {
                line_t oldline = CopLINE(PL_curcop);
                CopLINE_set(PL_curcop, PL_copline);
@@ -4542,7 +4600,6 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
            GV *db_postponed = gv_fetchpv("DB::postponed", GV_ADDMULTI, SVt_PVHV);
            CV *pcv;
            HV *hv;
-           char *t;
 
            Perl_sv_setpvf(aTHX_ sv, "%s:%ld-%ld",
                           CopFILE(PL_curcop),
@@ -4600,6 +4657,8 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
            if (!PL_checkav)
                PL_checkav = newAV();
            DEBUG_x( dump_sub(gv) );
+           if (PL_main_start && ckWARN(WARN_VOID))
+               Perl_warner(aTHX_ WARN_VOID, "Too late to run CHECK block");
            av_unshift(PL_checkav, 1);
            av_store(PL_checkav, 0, SvREFCNT_inc(cv));
            GvCV(gv) = 0;
@@ -4608,6 +4667,8 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
            if (!PL_initav)
                PL_initav = newAV();
            DEBUG_x( dump_sub(gv) );
+           if (PL_main_start && ckWARN(WARN_VOID))
+               Perl_warner(aTHX_ WARN_VOID, "Too late to run INIT block");
            av_push(PL_initav, SvREFCNT_inc(cv));
            GvCV(gv) = 0;
        }
@@ -4678,7 +4739,7 @@ Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
     GV *gv = gv_fetchpv(name ? name : "__ANON__", GV_ADDMULTI, SVt_PVCV);
     register CV *cv;
 
-    if (cv = (name ? GvCV(gv) : Nullcv)) {
+    if ((cv = (name ? GvCV(gv) : Nullcv))) {
        if (GvCVGEN(gv)) {
            /* just a cached method */
            SvREFCNT_dec(cv);
@@ -4748,6 +4809,8 @@ Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
        else if (strEQ(s, "CHECK")) {
            if (!PL_checkav)
                PL_checkav = newAV();
+           if (PL_main_start && ckWARN(WARN_VOID))
+               Perl_warner(aTHX_ WARN_VOID, "Too late to run CHECK block");
            av_unshift(PL_checkav, 1);
            av_store(PL_checkav, 0, SvREFCNT_inc(cv));
            GvCV(gv) = 0;
@@ -4755,6 +4818,8 @@ Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
        else if (strEQ(s, "INIT")) {
            if (!PL_initav)
                PL_initav = newAV();
+           if (PL_main_start && ckWARN(WARN_VOID))
+               Perl_warner(aTHX_ WARN_VOID, "Too late to run INIT block");
            av_push(PL_initav, SvREFCNT_inc(cv));
            GvCV(gv) = 0;
        }
@@ -4782,7 +4847,7 @@ Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
        name = "STDOUT";
     gv = gv_fetchpv(name,TRUE, SVt_PVFM);
     GvMULTI_on(gv);
-    if (cv = GvFORM(gv)) {
+    if ((cv = GvFORM(gv))) {
        if (ckWARN(WARN_REDEFINE)) {
            line_t oldline = CopLINE(PL_curcop);
 
@@ -5100,6 +5165,20 @@ Perl_ck_eval(pTHX_ OP *o)
 }
 
 OP *
+Perl_ck_exit(pTHX_ OP *o)
+{
+#ifdef VMS
+    HV *table = GvHV(PL_hintgv);
+    if (table) {
+       SV **svp = hv_fetch(table, "vmsish_exit", 11, FALSE);
+       if (svp && *svp && SvTRUE(*svp))
+           o->op_private |= OPpEXIT_VMSISH;
+    }
+#endif
+    return ck_fun(o);
+}
+
+OP *
 Perl_ck_exec(pTHX_ OP *o)
 {
     OP *kid;
@@ -5318,7 +5397,7 @@ Perl_ck_fun(pTHX_ OP *o)
        tokid = &cLISTOPo->op_first;
        kid = cLISTOPo->op_first;
        if (kid->op_type == OP_PUSHMARK ||
-           kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK)
+           (kid->op_type == OP_NULL && kid->op_targ == OP_PUSHMARK))
        {
            tokid = &kid->op_sibling;
            kid = kid->op_sibling;
@@ -5354,8 +5433,8 @@ Perl_ck_fun(pTHX_ OP *o)
                    char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
                    OP *newop = newAVREF(newGVOP(OP_GV, 0,
                        gv_fetchpv(name, TRUE, SVt_PVAV) ));
-                   if (ckWARN(WARN_SYNTAX))
-                       Perl_warner(aTHX_ WARN_SYNTAX,
+                   if (ckWARN(WARN_DEPRECATED))
+                       Perl_warner(aTHX_ WARN_DEPRECATED,
                            "Array @%s missing the @ in argument %"IVdf" of %s()",
                            name, (IV)numargs, PL_op_desc[type]);
                    op_free(kid);
@@ -5374,8 +5453,8 @@ Perl_ck_fun(pTHX_ OP *o)
                    char *name = SvPVx(((SVOP*)kid)->op_sv, n_a);
                    OP *newop = newHVREF(newGVOP(OP_GV, 0,
                        gv_fetchpv(name, TRUE, SVt_PVHV) ));
-                   if (ckWARN(WARN_SYNTAX))
-                       Perl_warner(aTHX_ WARN_SYNTAX,
+                   if (ckWARN(WARN_DEPRECATED))
+                       Perl_warner(aTHX_ WARN_DEPRECATED,
                            "Hash %%%s missing the %% in argument %"IVdf" of %s()",
                            name, (IV)numargs, PL_op_desc[type]);
                    op_free(kid);
@@ -5442,11 +5521,18 @@ Perl_ck_fun(pTHX_ OP *o)
                                name = GvNAME(gv);
                                len = GvNAMELEN(gv);
                            }
+                           else if (kid->op_type == OP_AELEM
+                                    || kid->op_type == OP_HELEM)
+                           {
+                               name = "__ANONIO__";
+                               len = 10;
+                               mod(kid,type);
+                           }
                            if (name) {
                                SV *namesv;
                                targ = pad_alloc(OP_RV2GV, SVs_PADTMP);
                                namesv = PL_curpad[targ];
-                               SvUPGRADE(namesv, SVt_PV);
+                               (void)SvUPGRADE(namesv, SVt_PV);
                                if (*name != '$')
                                    sv_setpvn(namesv, "$", 1);
                                sv_catpvn(namesv, name, len);
@@ -5494,6 +5580,7 @@ Perl_ck_glob(pTHX_ OP *o)
 {
     GV *gv;
 
+    o = ck_fun(o);
     if ((o->op_flags & OPf_KIDS) && !cLISTOPo->op_first->op_sibling)
        append_elem(OP_GLOB, o, newDEFSVOP());
 
@@ -5503,11 +5590,10 @@ Perl_ck_glob(pTHX_ OP *o)
 #if !defined(PERL_EXTERNAL_GLOB)
     /* XXX this can be tightened up and made more failsafe. */
     if (!gv) {
-       OP *modname = newSVOP(OP_CONST, 0, newSVpvn("File::Glob", 10));
-       modname->op_private |= OPpCONST_BARE;
        ENTER;
-       utilize(1, start_subparse(FALSE, 0), Nullop, modname,
-               newSVOP(OP_CONST, 0, newSVpvn(":globally", 9)));
+       Perl_load_module(aTHX_ 0, newSVpvn("File::Glob", 10), Nullsv,
+                        /* null-terminated import list */
+                        newSVpvn(":globally", 9), Nullsv);
        gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
        LEAVE;
     }
@@ -5532,7 +5618,7 @@ Perl_ck_glob(pTHX_ OP *o)
     gv_IOadd(gv);
     append_elem(OP_GLOB, o, newGVOP(OP_GV, 0, gv));
     scalarkids(o);
-    return ck_fun(o);
+    return o;
 }
 
 OP *
@@ -5626,7 +5712,7 @@ Perl_ck_defined(pTHX_ OP *o)              /* 19990527 MJD */
            Perl_warner(aTHX_ WARN_DEPRECATED,
                        "defined(@array) is deprecated");
            Perl_warner(aTHX_ WARN_DEPRECATED,
-                       "(Maybe you should just omit the defined()?)\n");
+                       "\t(Maybe you should just omit the defined()?)\n");
        break;
        case OP_RV2HV:
            break;                      /* Globals via GV can be undef */ 
@@ -5634,7 +5720,7 @@ Perl_ck_defined(pTHX_ OP *o)              /* 19990527 MJD */
            Perl_warner(aTHX_ WARN_DEPRECATED,
                        "defined(%%hash) is deprecated");
            Perl_warner(aTHX_ WARN_DEPRECATED,
-                       "(Maybe you should just omit the defined()?)\n");
+                       "\t(Maybe you should just omit the defined()?)\n");
            break;
        default:
            /* no warning */
@@ -5709,7 +5795,9 @@ Perl_ck_sassign(pTHX_ OP *o)
     OP *kid = cLISTOPo->op_first;
     /* has a disposable target? */
     if ((PL_opargs[kid->op_type] & OA_TARGLEX)
-       && !(kid->op_flags & OPf_STACKED))
+       && !(kid->op_flags & OPf_STACKED)
+       /* Cannot steal the second time! */
+       && !(kid->op_private & OPpTARGET_MY))
     {
        OP *kkid = kid->op_sibling;
 
@@ -5758,8 +5846,8 @@ Perl_ck_method(pTHX_ OP *o)
        SV* sv = kSVOP->op_sv;
        if (!(strchr(SvPVX(sv), ':') || strchr(SvPVX(sv), '\''))) {
            OP *cmop;
-           sv_upgrade(sv, SVt_PVIV);
-           SvIOK_on(sv);
+           (void)SvUPGRADE(sv, SVt_PVIV);
+           (void)SvIOK_on(sv);
            PERL_HASH(SvUVX(sv), SvPVX(sv), SvCUR(sv));
            cmop = newSVOP(OP_METHOD_NAMED, 0, sv);
            kSVOP->op_sv = Nullsv;
@@ -5777,6 +5865,36 @@ Perl_ck_null(pTHX_ OP *o)
 }
 
 OP *
+Perl_ck_open(pTHX_ OP *o)
+{
+    HV *table = GvHV(PL_hintgv);
+    if (table) {
+       SV **svp;
+       I32 mode;
+       svp = hv_fetch(table, "open_IN", 7, FALSE);
+       if (svp && *svp) {
+           mode = mode_from_discipline(*svp);
+           if (mode & O_BINARY)
+               o->op_private |= OPpOPEN_IN_RAW;
+           else if (mode & O_TEXT)
+               o->op_private |= OPpOPEN_IN_CRLF;
+       }
+
+       svp = hv_fetch(table, "open_OUT", 8, FALSE);
+       if (svp && *svp) {
+           mode = mode_from_discipline(*svp);
+           if (mode & O_BINARY)
+               o->op_private |= OPpOPEN_OUT_RAW;
+           else if (mode & O_TEXT)
+               o->op_private |= OPpOPEN_OUT_CRLF;
+       }
+    }
+    if (o->op_type == OP_BACKTICK)
+       return o;
+    return ck_fun(o);
+}
+
+OP *
 Perl_ck_repeat(pTHX_ OP *o)
 {
     if (cBINOPo->op_first->op_flags & OPf_PARENS) {
@@ -5803,7 +5921,13 @@ Perl_ck_require(pTHX_ OP *o)
                    --SvCUR(kid->op_sv);
                }
            }
-           sv_catpvn(kid->op_sv, ".pm", 3);
+           if (SvREADONLY(kid->op_sv)) {
+               SvREADONLY_off(kid->op_sv);
+               sv_catpvn(kid->op_sv, ".pm", 3);
+               SvREADONLY_on(kid->op_sv);
+           }
+           else
+               sv_catpvn(kid->op_sv, ".pm", 3);
        }
     }
     return ck_fun(o);
@@ -5898,6 +6022,12 @@ Perl_ck_sort(pTHX_ OP *o)
                    for (k = kLISTOP->op_first->op_next; k; k = k->op_next) {
                        if (k->op_next == kid)
                            k->op_next = 0;
+                       /* don't descend into loops */
+                       else if (k->op_type == OP_ENTERLOOP
+                                || k->op_type == OP_ENTERITER)
+                       {
+                           k = cLOOPx(k)->op_lastop;
+                       }
                    }
                }
                else
@@ -5956,7 +6086,7 @@ S_simplify_sort(pTHX_ OP *o)
        return;
     if (strEQ(GvNAME(gv), "a"))
        reversed = 0;
-    else if(strEQ(GvNAME(gv), "b"))
+    else if (strEQ(GvNAME(gv), "b"))
        reversed = 1;
     else
        return;
@@ -6295,19 +6425,16 @@ Perl_peep(pTHX_ register OP *o)
                o->op_targ = ix;
            }
 #endif
-           /* FALL THROUGH */
-       case OP_UC:
-       case OP_UCFIRST:
-       case OP_LC:
-       case OP_LCFIRST:
+           o->op_seq = PL_op_seqmax++;
+           break;
+
        case OP_CONCAT:
-       case OP_JOIN:
-       case OP_QUOTEMETA:
            if (o->op_next && o->op_next->op_type == OP_STRINGIFY) {
                if (o->op_next->op_private & OPpTARGET_MY) {
                    if (o->op_flags & OPf_STACKED) /* chained concats */
                        goto ignore_optimization;
                    else {
+                       /* assert(PL_opargs[o->op_type] & OA_TARGLEX); */
                        o->op_targ = o->op_next->op_targ;
                        o->op_next->op_targ = 0;
                        o->op_private |= OPpTARGET_MY;
@@ -6379,13 +6506,13 @@ Perl_peep(pTHX_ register OP *o)
                    GvAVn(gv);
                }
            }
-           else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_UNSAFE)) {
+           else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_PROTOTYPE)) {
                GV *gv = cGVOPo_gv;
                if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX(GvCV(gv))) {
                    /* XXX could check prototype here instead of just carping */
                    SV *sv = sv_newmortal();
                    gv_efullname3(sv, gv, Nullch);
-                   Perl_warner(aTHX_ WARN_UNSAFE,
+                   Perl_warner(aTHX_ WARN_PROTOTYPE,
                                "%s() called too early to check prototype",
                                SvPV_nolen(sv));
                }
@@ -6436,7 +6563,7 @@ Perl_peep(pTHX_ register OP *o)
                    Perl_warner(aTHX_ WARN_EXEC,
                                "Statement unlikely to be reached");
                    Perl_warner(aTHX_ WARN_EXEC,
-                               "(Maybe you meant system() when you said exec()?)\n");
+                               "\t(Maybe you meant system() when you said exec()?)\n");
                    CopLINE_set(PL_curcop, oldline);
                }
            }
@@ -6446,11 +6573,12 @@ Perl_peep(pTHX_ register OP *o)
            UNOP *rop;
            SV *lexname;
            GV **fields;
-           SV **svp, **indsvp;
+           SV **svp, **indsvp, *sv;
            I32 ind;
            char *key;
            STRLEN keylen;
        
+           o->op_seq = PL_op_seqmax++;
            if ((o->op_private & (OPpLVAL_INTRO))
                || ((BINOP*)o)->op_last->op_type != OP_CONST)
                break;
@@ -6477,8 +6605,76 @@ Perl_peep(pTHX_ register OP *o)
            rop->op_ppaddr = PL_ppaddr[OP_RV2AV];
            o->op_type = OP_AELEM;
            o->op_ppaddr = PL_ppaddr[OP_AELEM];
+           sv = newSViv(ind);
+           if (SvREADONLY(*svp))
+               SvREADONLY_on(sv);
+           SvFLAGS(sv) |= (SvFLAGS(*svp)
+                           & (SVs_PADBUSY|SVs_PADTMP|SVs_PADMY));
            SvREFCNT_dec(*svp);
-           *svp = newSViv(ind);
+           *svp = sv;
+           break;
+       }
+       
+       case OP_HSLICE: {
+           UNOP *rop;
+           SV *lexname;
+           GV **fields;
+           SV **svp, **indsvp, *sv;
+           I32 ind;
+           char *key;
+           STRLEN keylen;
+           SVOP *first_key_op, *key_op;
+
+           o->op_seq = PL_op_seqmax++;
+           if ((o->op_private & (OPpLVAL_INTRO))
+               /* I bet there's always a pushmark... */
+               || ((LISTOP*)o)->op_first->op_sibling->op_type != OP_LIST)
+               /* hmmm, no optimization if list contains only one key. */
+               break;
+           rop = (UNOP*)((LISTOP*)o)->op_last;
+           if (rop->op_type != OP_RV2HV || rop->op_first->op_type != OP_PADSV)
+               break;
+           lexname = *av_fetch(PL_comppad_name, rop->op_first->op_targ, TRUE);
+           if (!SvOBJECT(lexname))
+               break;
+           fields = (GV**)hv_fetch(SvSTASH(lexname), "FIELDS", 6, FALSE);
+           if (!fields || !GvHV(*fields))
+               break;
+           /* Again guessing that the pushmark can be jumped over.... */
+           first_key_op = (SVOP*)((LISTOP*)((LISTOP*)o)->op_first->op_sibling)
+               ->op_first->op_sibling;
+           /* Check that the key list contains only constants. */
+           for (key_op = first_key_op; key_op;
+                key_op = (SVOP*)key_op->op_sibling)
+               if (key_op->op_type != OP_CONST)
+                   break;
+           if (key_op)
+               break;
+           rop->op_type = OP_RV2AV;
+           rop->op_ppaddr = PL_ppaddr[OP_RV2AV];
+           o->op_type = OP_ASLICE;
+           o->op_ppaddr = PL_ppaddr[OP_ASLICE];
+           for (key_op = first_key_op; key_op;
+                key_op = (SVOP*)key_op->op_sibling) {
+               svp = cSVOPx_svp(key_op);
+               key = SvPV(*svp, keylen);
+               indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
+               if (!indsvp) {
+                   Perl_croak(aTHX_ "No such pseudo-hash field \"%s\" "
+                              "in variable %s of type %s",
+                         key, SvPV(lexname, n_a), HvNAME(SvSTASH(lexname)));
+               }
+               ind = SvIV(*indsvp);
+               if (ind < 1)
+                   Perl_croak(aTHX_ "Bad index while coercing array into hash");
+               sv = newSViv(ind);
+               if (SvREADONLY(*svp))
+                   SvREADONLY_on(sv);
+               SvFLAGS(sv) |= (SvFLAGS(*svp)
+                               & (SVs_PADBUSY|SVs_PADTMP|SVs_PADMY));
+               SvREFCNT_dec(*svp);
+               *svp = sv;
+           }
            break;
        }