remove VIRTUAL tag, PERL_OBJECT doesn't need it anymore
[p5sagit/p5-mst-13.2.git] / op.c
diff --git a/op.c b/op.c
index 42ed8b2..cb868a4 100644 (file)
--- a/op.c
+++ b/op.c
 #include "EXTERN.h"
 #define PERL_IN_OP_C
 #include "perl.h"
+#include "keywords.h"
 
 /* #define PL_OP_SLAB_ALLOC */
-                                                            
+
+/* XXXXXX testing */
+#define OP_REFCNT_LOCK         NOOP
+#define OP_REFCNT_UNLOCK       NOOP
+#define OpREFCNT_set(o,n)      NOOP
+#define OpREFCNT_dec(o)                0
+
 #ifdef PL_OP_SLAB_ALLOC 
 #define SLAB_SIZE 8192
 static char    *PL_OpPtr  = NULL;
@@ -96,9 +103,9 @@ S_bad_type(pTHX_ I32 n, char *t, char *name, OP *kid)
 STATIC void
 S_no_bareword_allowed(pTHX_ OP *o)
 {
-    Perl_warn(aTHX_ "Bareword \"%s\" not allowed while \"strict subs\" in use",
-         SvPV_nolen(cSVOPo->op_sv));
-    ++PL_error_count;
+    qerror(Perl_mess(aTHX_
+                    "Bareword \"%s\" not allowed while \"strict subs\" in use",
+                    SvPV_nolen(cSVOPo->op_sv)));
 }
 
 /* "register" allocation */
@@ -111,9 +118,10 @@ Perl_pad_allocmy(pTHX_ char *name)
     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))
+       name[1] == '_' && (int)strlen(name) > 2 ))
     {
        if (!isPRINT(name[1]) || strchr("\t\n\r\f", name[1])) {
            /* 1999-02-27 mjd@plover.com */
@@ -145,8 +153,10 @@ Perl_pad_allocmy(pTHX_ char *name)
                && strEQ(name, SvPVX(sv)))
            {
                Perl_warner(aTHX_ WARN_UNSAFE,
-                       "\"my\" variable %s masks earlier declaration in same %s", 
-                       name, (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
+                       "\"%s\" variable %s masks earlier declaration in same %s", 
+                       (PL_in_my == KEY_our ? "our" : "my"),
+                       name,
+                       (SvIVX(sv) == PAD_MAX ? "scope" : "statement"));
                break;
            }
        }
@@ -164,6 +174,8 @@ Perl_pad_allocmy(pTHX_ char *name)
        SvSTASH(sv) = (HV*)SvREFCNT_inc(PL_in_my_stash);
        PL_sv_objcount++;
     }
+    if (PL_in_my == KEY_our)
+       SvFLAGS(sv) |= SVpad_OUR;
     av_store(PL_comppad_name, off, sv);
     SvNVX(sv) = (NV)PAD_MAX;
     SvIVX(sv) = 0;                     /* Not yet introduced--see newSTATEOP */
@@ -231,6 +243,8 @@ S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv,
                    SvNVX(namesv) = (NV)PL_curcop->cop_seq;
                    SvIVX(namesv) = PAD_MAX;    /* A ref, intro immediately */
                    SvFAKE_on(namesv);          /* A ref, not a real var */
+                   if (SvFLAGS(sv) & SVpad_OUR)/* An "our" variable */
+                       SvFLAGS(namesv) |= SVpad_OUR;
                    if (SvOBJECT(sv)) {         /* A typed var */
                        SvOBJECT_on(namesv);
                        (void)SvUPGRADE(namesv, SVt_PVMG);
@@ -355,7 +369,7 @@ Perl_pad_findmy(pTHX_ char *name)
              seq > I_32(SvNVX(sv)))) &&
            strEQ(SvPVX(sv), name))
        {
-           if (SvIVX(sv))
+           if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR)
                return (PADOFFSET)off;
            pendoff = off;      /* this pending def. will override import */
        }
@@ -442,12 +456,14 @@ Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype)
     SvFLAGS(sv) |= tmptype;
     PL_curpad = AvARRAY(PL_comppad);
 #ifdef USE_THREADS
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx alloc %ld for %s\n",
-                         (unsigned long) thr, (unsigned long) PL_curpad,
+    DEBUG_X(PerlIO_printf(Perl_debug_log,
+                         "0x%"UVxf" Pad 0x%"UVxf" alloc %ld for %s\n",
+                         PTR2UV(thr), PTR2UV(PL_curpad),
                          (long) retval, PL_op_name[optype]));
 #else
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx alloc %ld for %s\n",
-                         (unsigned long) PL_curpad,
+    DEBUG_X(PerlIO_printf(Perl_debug_log,
+                         "Pad 0x%"UVxf" alloc %ld for %s\n",
+                         PTR2UV(PL_curpad),
                          (long) retval, PL_op_name[optype]));
 #endif /* USE_THREADS */
     return (PADOFFSET)retval;
@@ -458,13 +474,14 @@ Perl_pad_sv(pTHX_ PADOFFSET po)
 {
     dTHR;
 #ifdef USE_THREADS
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx sv %d\n",
-                         (unsigned long) thr, (unsigned long) PL_curpad, po));
+    DEBUG_X(PerlIO_printf(Perl_debug_log,
+                         "0x%"UVxf" Pad 0x%"UVxf" sv %d\n",
+                         PTR2UV(thr), PTR2UV(PL_curpad), po));
 #else
     if (!po)
        Perl_croak(aTHX_ "panic: pad_sv po");
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx sv %d\n",
-                         (unsigned long) PL_curpad, po));
+    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" sv %d\n",
+                         PTR2UV(PL_curpad), po));
 #endif /* USE_THREADS */
     return PL_curpad[po];              /* eventually we'll turn this into a macro */
 }
@@ -480,11 +497,12 @@ Perl_pad_free(pTHX_ PADOFFSET po)
     if (!po)
        Perl_croak(aTHX_ "panic: pad_free po");
 #ifdef USE_THREADS
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx free %d\n",
-                         (unsigned long) thr, (unsigned long) PL_curpad, po));
+    DEBUG_X(PerlIO_printf(Perl_debug_log,
+                         "0x%"UVxf" Pad 0x%"UVxf" free %d\n",
+                         PTR2UV(thr), PTR2UV(PL_curpad), po));
 #else
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx free %d\n",
-                         (unsigned long) PL_curpad, po));
+    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" free %d\n",
+                         PTR2UV(PL_curpad), po));
 #endif /* USE_THREADS */
     if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef)
        SvPADTMP_off(PL_curpad[po]);
@@ -501,11 +519,12 @@ Perl_pad_swipe(pTHX_ PADOFFSET po)
     if (!po)
        Perl_croak(aTHX_ "panic: pad_swipe po");
 #ifdef USE_THREADS
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx swipe %d\n",
-                         (unsigned long) thr, (unsigned long) PL_curpad, po));
+    DEBUG_X(PerlIO_printf(Perl_debug_log,
+                         "0x%"UVxf" Pad 0x%"UVxf" swipe %d\n",
+                         PTR2UV(thr), PTR2UV(PL_curpad), po));
 #else
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx swipe %d\n",
-                         (unsigned long) PL_curpad, po));
+    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" swipe %d\n",
+                         PTR2UV(PL_curpad), po));
 #endif /* USE_THREADS */
     SvPADTMP_off(PL_curpad[po]);
     PL_curpad[po] = NEWSV(1107,0);
@@ -530,11 +549,12 @@ Perl_pad_reset(pTHX)
     if (AvARRAY(PL_comppad) != PL_curpad)
        Perl_croak(aTHX_ "panic: pad_reset curpad");
 #ifdef USE_THREADS
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "0x%lx Pad 0x%lx reset\n",
-                         (unsigned long) thr, (unsigned long) PL_curpad));
+    DEBUG_X(PerlIO_printf(Perl_debug_log,
+                         "0x%"UVxf" Pad 0x%"UVxf" reset\n",
+                         PTR2UV(thr), PTR2UV(PL_curpad)));
 #else
-    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%lx reset\n",
-                         (unsigned long) PL_curpad));
+    DEBUG_X(PerlIO_printf(Perl_debug_log, "Pad 0x%"UVxf" reset\n",
+                         PTR2UV(PL_curpad)));
 #endif /* USE_THREADS */
     if (!PL_tainting) {        /* Can't mix tainted and non-tainted temporaries. */
        for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) {
@@ -606,7 +626,7 @@ Perl_find_threadsv(pTHX_ const char *name)
        default:
            sv_magic(sv, 0, 0, name, 1); 
        }
-       DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+       DEBUG_S(PerlIO_printf(Perl_error_log,
                              "find_threadsv: new SV %p for $%s%c\n",
                              sv, (*name < 32) ? "^" : "",
                              (*name < 32) ? toCTRL(*name) : *name));
@@ -626,6 +646,26 @@ Perl_op_free(pTHX_ OP *o)
     if (!o || o->op_seq == (U16)-1)
        return;
 
+    if (o->op_private & OPpREFCOUNTED) {
+       switch (o->op_type) {
+       case OP_LEAVESUB:
+       case OP_LEAVESUBLV:
+       case OP_LEAVEEVAL:
+       case OP_LEAVE:
+       case OP_SCOPE:
+       case OP_LEAVEWRITE:
+           OP_REFCNT_LOCK;
+           if (OpREFCNT_dec(o)) {
+               OP_REFCNT_UNLOCK;
+               return;
+           }
+           OP_REFCNT_UNLOCK;
+           break;
+       default:
+           break;
+       }
+    }
+
     if (o->op_flags & OPf_KIDS) {
        for (kid = cUNOPo->op_first; kid; kid = nextkid) {
            nextkid = kid->op_sibling; /* Get before next freeing kid */
@@ -677,8 +717,8 @@ S_op_clear(pTHX_ OP *o)
     case OP_GVSV:
     case OP_GV:
     case OP_AELEMFAST:
-       SvREFCNT_dec(cGVOPo->op_gv);
-       cGVOPo->op_gv = Nullgv;
+       SvREFCNT_dec(cSVOPo->op_sv);
+       cSVOPo->op_sv = Nullsv;
        break;
     case OP_CONST:
        SvREFCNT_dec(cSVOPo->op_sv);
@@ -721,7 +761,7 @@ STATIC void
 S_cop_free(pTHX_ COP* cop)
 {
     Safefree(cop->cop_label);
-    SvREFCNT_dec(cop->cop_filegv);
+    SvREFCNT_dec(CopFILEGV(cop));
     if (! specialWARN(cop->cop_warnings))
        SvREFCNT_dec(cop->cop_warnings);
 }
@@ -1239,6 +1279,91 @@ Perl_mod(pTHX_ OP *o, I32 type)
            null(((LISTOP*)cUNOPo->op_first)->op_first);/* disable pushmark */
            break;
        }
+       else {                          /* lvalue subroutine call */
+           o->op_private |= OPpLVAL_INTRO;
+           if (type == OP_GREPSTART || type == OP_ENTERSUB) {
+               /* Backward compatibility mode: */
+               o->op_private |= OPpENTERSUB_INARGS;
+               break;
+           }
+           else {                      /* Compile-time error message: */
+               OP *kid = cUNOPo->op_first;
+               CV *cv;
+               OP *okid;
+
+               if (kid->op_type == OP_PUSHMARK)
+                   goto skip_kids;
+               if (kid->op_type != OP_NULL || kid->op_targ != OP_LIST)
+                   Perl_croak(aTHX_
+                              "panic: unexpected lvalue entersub "
+                              "args: type/targ %ld:%ld",
+                              (long)kid->op_type,kid->op_targ);
+               kid = kLISTOP->op_first;
+             skip_kids:
+               while (kid->op_sibling)
+                   kid = kid->op_sibling;
+               if (!(kid->op_type == OP_NULL && kid->op_targ == OP_RV2CV)) {
+                   /* Indirect call */
+                   if (kid->op_type == OP_METHOD_NAMED
+                       || kid->op_type == OP_METHOD)
+                   {
+                       OP *newop;
+
+                       if (kid->op_sibling || kid->op_next != kid) {
+                           yyerror("panic: unexpected optree near method call");
+                           break;
+                       }
+                       
+                       NewOp(1101, newop, 1, OP);
+                       newop->op_type = OP_RV2CV;
+                       newop->op_ppaddr = PL_ppaddr[OP_RV2CV];
+                       newop->op_next = newop;
+                       kid->op_sibling = newop;
+                       newop->op_private |= OPpLVAL_INTRO;
+                       break;
+                   }
+                   
+                   if (kid->op_type != OP_RV2CV)
+                       Perl_croak(aTHX_
+                                  "panic: unexpected lvalue entersub "
+                                  "entry via type/targ %ld:%ld",
+                                  (long)kid->op_type,kid->op_targ);
+                   kid->op_private |= OPpLVAL_INTRO;
+                   break;      /* Postpone until runtime */
+               }
+               
+               okid = kid;             
+               kid = kUNOP->op_first;
+               if (kid->op_type == OP_NULL && kid->op_targ == OP_RV2SV)
+                   kid = kUNOP->op_first;
+               if (kid->op_type == OP_NULL)            
+                   Perl_croak(aTHX_
+                              "Unexpected constant lvalue entersub "
+                              "entry via type/targ %ld:%ld",
+                              (long)kid->op_type,kid->op_targ);
+               if (kid->op_type != OP_GV) {
+                   /* Restore RV2CV to check lvalueness */
+                 restore_2cv:
+                   if (kid->op_next && kid->op_next != kid) { /* Happens? */
+                       okid->op_next = kid->op_next;
+                       kid->op_next = okid;
+                   }
+                   else
+                       okid->op_next = Nullop;
+                   okid->op_type = OP_RV2CV;
+                   okid->op_targ = 0;
+                   okid->op_ppaddr = PL_ppaddr[OP_RV2CV];
+                   okid->op_private |= OPpLVAL_INTRO;
+                   break;
+               }
+               
+               cv = GvCV((GV*)kSVOP->op_sv);
+               if (!cv) 
+                   goto restore_2cv;
+               if (CvLVALUE(cv))
+                   break;
+           }
+       }
        /* FALL THROUGH */
     default:
       nomod:
@@ -1247,7 +1372,10 @@ Perl_mod(pTHX_ OP *o, I32 type)
            break;
        yyerror(Perl_form(aTHX_ "Can't modify %s in %s",
                     (o->op_type == OP_NULL && (o->op_flags & OPf_SPECIAL)
-                     ? "do block" : PL_op_desc[o->op_type]),
+                     ? "do block"
+                     : (o->op_type == OP_ENTERSUB
+                       ? "non-lvalue subroutine call"
+                       : PL_op_desc[o->op_type])),
                     type ? PL_op_desc[type] : "local"));
        return o;
 
@@ -1643,6 +1771,10 @@ S_my_kid(pTHX_ OP *o, OP *attrs)
            my_kid(kid, attrs);
     } else if (type == OP_UNDEF) {
        return o;
+    } else if (type == OP_RV2SV ||     /* "our" declaration */
+              type == OP_RV2AV ||
+              type == OP_RV2HV) { /* XXX does this let anything illegal in? */
+       return o;
     } else if (type != OP_PADSV &&
             type != OP_PADAV &&
             type != OP_PADHV &&
@@ -1710,9 +1842,9 @@ Perl_bind_match(pTHX_ I32 type, OP *left, OP *right)
       char *desc = PL_op_desc[(right->op_type == OP_SUBST ||
                             right->op_type == OP_TRANS)
                            ? right->op_type : OP_MATCH];
-      char *sample = ((left->op_type == OP_RV2AV ||
-                       left->op_type == OP_PADAV)
-                      ? "@array" : "%hash");
+      const char *sample = ((left->op_type == OP_RV2AV ||
+                            left->op_type == OP_PADAV)
+                           ? "@array" : "%hash");
       Perl_warner(aTHX_ WARN_UNSAFE,
              "Applying %s to %s will act on scalar(%s)", 
              desc, sample, sample);
@@ -1761,10 +1893,8 @@ Perl_scope(pTHX_ OP *o)
                o->op_type = OP_SCOPE;
                o->op_ppaddr = PL_ppaddr[OP_SCOPE];
                kid = ((LISTOP*)o)->op_first;
-               if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE){
-                   kid->op_type = OP_SETSTATE;
-                   kid->op_ppaddr = PL_ppaddr[OP_SETSTATE];
-               }
+               if (kid->op_type == OP_NEXTSTATE || kid->op_type == OP_DBSTATE)
+                   null(kid);
            }
            else
                o = newLISTOP(OP_SCOPE, 0, o, Nullop);
@@ -1853,6 +1983,8 @@ Perl_newPROG(pTHX_ OP *o)
                               ((PL_in_eval & EVAL_KEEPERR)
                                ? OPf_SPECIAL : 0), o);
        PL_eval_start = linklist(PL_eval_root);
+       PL_eval_root->op_private |= OPpREFCOUNTED;
+       OpREFCNT_set(PL_eval_root, 1);
        PL_eval_root->op_next = 0;
        peep(PL_eval_start);
     }
@@ -1862,6 +1994,8 @@ Perl_newPROG(pTHX_ OP *o)
        PL_main_root = scope(sawparens(scalarvoid(o)));
        PL_curcop = &PL_compiling;
        PL_main_start = LINKLIST(PL_main_root);
+       PL_main_root->op_private |= OPpREFCOUNTED;
+       OpREFCNT_set(PL_main_root, 1);
        PL_main_root->op_next = 0;
        peep(PL_main_start);
        PL_compcv = 0;
@@ -1872,7 +2006,7 @@ Perl_newPROG(pTHX_ OP *o)
            if (cv) {
                dSP;
                PUSHMARK(SP);
-               XPUSHs((SV*)PL_compiling.cop_filegv);
+               XPUSHs((SV*)CopFILEGV(&PL_compiling));
                PUTBACK;
                call_sv((SV*)cv, G_DISCARD);
            }
@@ -2014,8 +2148,12 @@ Perl_fold_constants(pTHX_ register OP *o)
        return o;
 
     if (!(PL_hints & HINT_INTEGER)) {
-       if (type == OP_DIVIDE || !(o->op_flags & OPf_KIDS))
+       if (type == OP_MODULO
+           || type == OP_DIVIDE
+           || !(o->op_flags & OPf_KIDS))
+       {
            return o;
+       }
 
        for (curop = ((UNOP*)o)->op_first; curop; curop = curop->op_sibling) {
            if (curop->op_type == OP_CONST) {
@@ -2677,7 +2815,7 @@ Perl_pmruntime(pTHX_ OP *o, OP *expr, OP *repl)
                    }
 #else
                    if (curop->op_type == OP_GV) {
-                       GV *gv = ((GVOP*)curop)->op_gv;
+                       GV *gv = (GV*)((SVOP*)curop)->op_sv;
                        repl_has_vars = 1;
                        if (strchr("&`'123456789+", *GvENAME(gv)))
                            break;
@@ -2761,18 +2899,7 @@ OP *
 Perl_newGVOP(pTHX_ I32 type, I32 flags, GV *gv)
 {
     dTHR;
-    GVOP *gvop;
-    NewOp(1101, gvop, 1, GVOP);
-    gvop->op_type = type;
-    gvop->op_ppaddr = PL_ppaddr[type];
-    gvop->op_gv = (GV*)SvREFCNT_inc(gv);
-    gvop->op_next = (OP*)gvop;
-    gvop->op_flags = flags;
-    if (PL_opargs[type] & OA_RETSCALAR)
-       scalar((OP*)gvop);
-    if (PL_opargs[type] & OA_TARGET)
-       gvop->op_targ = pad_alloc(type, SVs_PADTMP);
-    return CHECKOP(type, gvop);
+    return newSVOP(type, flags, SvREFCNT_inc(gv));
 }
 
 OP *
@@ -2901,6 +3028,7 @@ Perl_utilize(pTHX_ int aver, I32 floor, OP *version, OP *id, OP *arg)
                newSTATEOP(0, Nullch, veop)),
            newSTATEOP(0, Nullch, imop) ));
 
+    PL_hints |= HINT_BLOCK_SCOPE;
     PL_copline = NOLINE;
     PL_expect = XSTATE;
 }
@@ -3010,7 +3138,7 @@ Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
            for (curop = LINKLIST(o); curop != o; curop = LINKLIST(curop)) {
                if (PL_opargs[curop->op_type] & OA_DANGEROUS) {
                    if (curop->op_type == OP_GV) {
-                       GV *gv = ((GVOP*)curop)->op_gv;
+                       GV *gv = (GV*)((SVOP*)curop)->op_sv;
                        if (gv == PL_defgv || SvCUR(gv) == PL_generation)
                            break;
                        SvCUR(gv) = PL_generation;
@@ -3062,7 +3190,7 @@ Perl_newASSIGNOP(pTHX_ I32 flags, OP *left, I32 optype, OP *right)
                {
                    tmpop = ((UNOP*)left)->op_first;
                    if (tmpop->op_type == OP_GV && !pm->op_pmreplroot) {
-                       pm->op_pmreplroot = (OP*)((GVOP*)tmpop)->op_gv;
+                       pm->op_pmreplroot = (OP*)((SVOP*)tmpop)->op_sv;
                        pm->op_pmflags |= PMf_ONCE;
                        tmpop = cUNOPo->op_first;       /* to list (nulled) */
                        tmpop = ((UNOP*)tmpop)->op_first; /* to pushmark */
@@ -3146,14 +3274,14 @@ Perl_newSTATEOP(pTHX_ I32 flags, char *label, OP *o)
     if (PL_copline == NOLINE)
         cop->cop_line = PL_curcop->cop_line;
     else {
-        cop->cop_line = PL_copline;
+       cop->cop_line = PL_copline;
         PL_copline = NOLINE;
     }
-    cop->cop_filegv = (GV*)SvREFCNT_inc(PL_curcop->cop_filegv);
+    CopFILEGV_set(cop, (GV*)SvREFCNT_inc(CopFILEGV(PL_curcop)));
     cop->cop_stash = PL_curstash;
 
     if (PERLDB_LINE && PL_curstash != PL_debstash) {
-       SV **svp = av_fetch(GvAV(PL_curcop->cop_filegv),(I32)cop->cop_line, FALSE);
+       SV **svp = av_fetch(CopFILEAV(PL_curcop), (I32)CopLINE(cop), FALSE);
        if (svp && *svp != &PL_sv_undef && !SvIOK(*svp)) {
            (void)SvIOK_on(*svp);
            SvIVX(*svp) = 1;
@@ -3252,14 +3380,20 @@ S_new_logop(pTHX_ I32 type, I32 flags, OP** firstp, OP** otherp)
            if (k2 && k2->op_type == OP_READLINE
                  && (k2->op_flags & OPf_STACKED)
                  && ((k1->op_flags & OPf_WANT) == OPf_WANT_SCALAR)) 
+           {
                warnop = k2->op_type;
+           }
            break;
 
        case OP_SASSIGN:
            if (k1->op_type == OP_READDIR
                  || k1->op_type == OP_GLOB
+                 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
                  || k1->op_type == OP_EACH)
-               warnop = k1->op_type;
+           {
+               warnop = ((k1->op_type == OP_NULL)
+                         ? k1->op_targ : k1->op_type);
+           }
            break;
        }
        if (warnop) {
@@ -3431,6 +3565,7 @@ Perl_newLOOPOP(pTHX_ I32 flags, I32 debuggable, OP *expr, OP *block)
              case OP_SASSIGN:
                if (k1->op_type == OP_READDIR
                      || k1->op_type == OP_GLOB
+                     || (k1->op_type == OP_NULL && k1->op_targ == OP_NULL)
                      || k1->op_type == OP_EACH)
                    expr = newUNOP(OP_DEFINED, 0, expr);
                break;
@@ -3484,6 +3619,7 @@ Perl_newWHILEOP(pTHX_ I32 flags, I32 debuggable, LOOP *loop, I32 whileline, OP *
          case OP_SASSIGN:
            if (k1->op_type == OP_READDIR
                  || k1->op_type == OP_GLOB
+                 || (k1->op_type == OP_NULL && k1->op_targ == OP_GLOB)
                  || k1->op_type == OP_EACH)
                expr = newUNOP(OP_DEFINED, 0, expr);
            break;
@@ -3735,13 +3871,14 @@ cv_dump(CV *cv)
     SV** ppad;
     I32 ix;
 
-    PerlIO_printf(Perl_debug_log, "\tCV=0x%lx (%s), OUTSIDE=0x%lx (%s)\n",
-                 cv,
+    PerlIO_printf(Perl_debug_log,
+                 "\tCV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n",
+                 PTR2UV(cv),
                  (CvANON(cv) ? "ANON"
                   : (cv == PL_main_cv) ? "MAIN"
                   : CvUNIQUE(cv) ? "UNIQUE"
                   : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"),
-                 outside,
+                 PTR2UV(outside),
                  (!outside ? "null"
                   : CvANON(outside) ? "ANON"
                   : (outside == PL_main_cv) ? "MAIN"
@@ -3758,12 +3895,13 @@ cv_dump(CV *cv)
 
     for (ix = 1; ix <= AvFILLp(pad_name); ix++) {
        if (SvPOK(pname[ix]))
-           PerlIO_printf(Perl_debug_log, "\t%4d. 0x%lx (%s\"%s\" %ld-%ld)\n",
-                         ix, ppad[ix],
+           PerlIO_printf(Perl_debug_log,
+                         "\t%4d. 0x%"UVxf" (%s\"%s\" %"IVdf"-%"IVdf")\n",
+                         ix, PTR2UV(ppad[ix]),
                          SvFAKE(pname[ix]) ? "FAKE " : "",
                          SvPVX(pname[ix]),
-                         (long)I_32(SvNVX(pname[ix])),
-                         (long)SvIVX(pname[ix]));
+                         (IV)I_32(SvNVX(pname[ix])),
+                         SvIVX(pname[ix]));
     }
 }
 #endif /* DEBUG_CLOSURES */
@@ -3803,7 +3941,6 @@ S_cv_clone2(pTHX_ CV *proto, CV *outside)
     MUTEX_INIT(CvMUTEXP(cv));
     CvOWNER(cv)                = 0;
 #endif /* USE_THREADS */
-    CvFILEGV(cv)       = CvFILEGV(proto);
     CvGV(cv)           = (GV*)SvREFCNT_inc(CvGV(proto));
     CvSTASH(cv)                = CvSTASH(proto);
     CvROOT(cv)         = CvROOT(proto);
@@ -4129,7 +4266,6 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
        }
     }
     CvGV(cv) = (GV*)SvREFCNT_inc(gv);
-    CvFILEGV(cv) = PL_curcop->cop_filegv;
     CvSTASH(cv) = PL_curstash;
 #ifdef USE_THREADS
     CvOWNER(cv) = 0;
@@ -4207,7 +4343,14 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
        }
     }
 
-    CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
+    if (CvLVALUE(cv)) {
+       CvROOT(cv) = newUNOP(OP_LEAVESUBLV, 0, scalarseq(block));
+    }
+    else {
+       CvROOT(cv) = newUNOP(OP_LEAVESUB, 0, scalarseq(block));
+    }
+    CvROOT(cv)->op_private |= OPpREFCOUNTED;
+    OpREFCNT_set(CvROOT(cv), 1);
     CvSTART(cv) = LINKLIST(CvROOT(cv));
     CvROOT(cv)->op_next = 0;
     peep(CvSTART(cv));
@@ -4223,8 +4366,8 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
            HV *hv;
 
            Perl_sv_setpvf(aTHX_ sv, "%_:%ld-%ld",
-                   GvSV(PL_curcop->cop_filegv),
-                   (long)PL_subline, (long)PL_curcop->cop_line);
+                          CopFILESV(PL_curcop),
+                          (long)PL_subline, (long)CopLINE(PL_curcop));
            gv_efullname3(tmpstr, gv, Nullch);
            hv_store(GvHV(PL_DBsub), SvPVX(tmpstr), SvCUR(tmpstr), sv, 0);
            hv = GvHVn(db_postponed);
@@ -4245,7 +4388,7 @@ Perl_newATTRSUB(pTHX_ I32 floor, OP *o, OP *proto, OP *attrs, OP *block)
        if (strEQ(s, "BEGIN")) {
            I32 oldscope = PL_scopestack_ix;
            ENTER;
-           SAVESPTR(PL_compiling.cop_filegv);
+           SAVESPTR(CopFILEGV(&PL_compiling));
            SAVEI16(PL_compiling.cop_line);
            save_svref(&PL_rs);
            sv_setsv(PL_rs, PL_nrs);
@@ -4357,7 +4500,7 @@ Perl_newXS(pTHX_ char *name, XSUBADDR_t subaddr, char *filename)
     MUTEX_INIT(CvMUTEXP(cv));
     CvOWNER(cv) = 0;
 #endif /* USE_THREADS */
-    CvFILEGV(cv) = gv_fetchfile(filename);
+    (void)gv_fetchfile(filename);
     CvXSUB(cv) = subaddr;
 
     if (name) {
@@ -4421,7 +4564,6 @@ Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
     cv = PL_compcv;
     GvFORM(gv) = cv;
     CvGV(cv) = (GV*)SvREFCNT_inc(gv);
-    CvFILEGV(cv) = PL_curcop->cop_filegv;
 
     for (ix = AvFILLp(PL_comppad); ix > 0; ix--) {
        if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix]))
@@ -4429,6 +4571,8 @@ Perl_newFORM(pTHX_ I32 floor, OP *o, OP *block)
     }
 
     CvROOT(cv) = newUNOP(OP_LEAVEWRITE, 0, scalarseq(block));
+    CvROOT(cv)->op_private |= OPpREFCOUNTED;
+    OpREFCNT_set(CvROOT(cv), 1);
     CvSTART(cv) = LINKLIST(CvROOT(cv));
     CvROOT(cv)->op_next = 0;
     peep(CvSTART(cv));
@@ -4943,17 +5087,10 @@ 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) ));
-#ifdef IV_IS_QUAD
                    if (ckWARN(WARN_SYNTAX))
                        Perl_warner(aTHX_ WARN_SYNTAX,
-                           "Array @%s missing the @ in argument %" PERL_PRId64 " of %s()",
+                           "Array @%s missing the @ in argument %"IVdf" of %s()",
                            name, (IV)numargs, PL_op_desc[type]);
-#else
-                   if (ckWARN(WARN_SYNTAX))
-                       Perl_warner(aTHX_ WARN_SYNTAX,
-                           "Array @%s missing the @ in argument %ld of %s()",
-                           name, (long)numargs, PL_op_desc[type]);
-#endif
                    op_free(kid);
                    kid = newop;
                    kid->op_sibling = sibl;
@@ -4970,17 +5107,10 @@ 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) ));
-#ifdef IV_IS_QUAD
                    if (ckWARN(WARN_SYNTAX))
                        Perl_warner(aTHX_ WARN_SYNTAX,
-                           "Hash %%%s missing the %% in argument %" PERL_PRId64 " of %s()",
+                           "Hash %%%s missing the %% in argument %"IVdf" of %s()",
                            name, (IV)numargs, PL_op_desc[type]);
-#else
-                   if (ckWARN(WARN_SYNTAX))
-                       Perl_warner(aTHX_ WARN_SYNTAX,
-                           "Hash %%%s missing the %% in argument %ld of %s()",
-                           name, (long)numargs, PL_op_desc[type]);
-#endif
                    op_free(kid);
                    kid = newop;
                    kid->op_sibling = sibl;
@@ -5083,6 +5213,19 @@ Perl_ck_glob(pTHX_ OP *o)
     if (!((gv = gv_fetchpv("glob", FALSE, SVt_PVCV)) && GvIMPORTED_CV(gv)))
        gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
 
+#if defined(PERL_INTERNAL_GLOB) && !defined(MINIPERL_BUILD)
+    /* 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", 8)));
+       gv = gv_fetchpv("CORE::GLOBAL::glob", FALSE, SVt_PVCV);
+       LEAVE;
+    }
+#endif /* PERL_INTERNAL_GLOB && !MINIPERL_BUILD */
+
     if (gv && GvIMPORTED_CV(gv)) {
        append_elem(OP_GLOB, o,
                    newSVOP(OP_CONST, 0, newSViv(PL_glob_index++)));
@@ -5288,11 +5431,29 @@ Perl_ck_sassign(pTHX_ OP *o)
            && !(kkid->op_private & OPpLVAL_INTRO))
        {
            /* Concat has problems if target is equal to right arg. */
-           if (kid->op_type == OP_CONCAT
-               && kLISTOP->op_first->op_sibling->op_type == OP_PADSV
-               && kLISTOP->op_first->op_sibling->op_targ == kkid->op_targ)
-           {
-               return o;
+           if (kid->op_type == OP_CONCAT) {
+               if (kLISTOP->op_first->op_sibling->op_type == OP_PADSV
+                   && kLISTOP->op_first->op_sibling->op_targ == kkid->op_targ)
+                   return o;
+           }
+           else if (kid->op_type == OP_JOIN) {
+               /* do_join has problems if the arguments coincide with target.
+                  In fact the second argument *can* safely coincide,
+                  but ignore=pessimize this rare occasion. */
+               OP *arg = kLISTOP->op_first->op_sibling; /* Skip PUSHMARK */
+
+               while (arg) {
+                   if (arg->op_type == OP_PADSV
+                       && arg->op_targ == kkid->op_targ)
+                       return o;
+                   arg = arg->op_sibling;
+               }
+           }
+           else if (kid->op_type == OP_QUOTEMETA) {
+               /* quotemeta has problems if the argument coincides with target. */
+               if (kLISTOP->op_first->op_type == OP_PADSV
+                   && kLISTOP->op_first->op_targ == kkid->op_targ)
+                   return o;
            }
            kid->op_targ = kkid->op_targ;
            /* Now we do not need PADSV and SASSIGN. */
@@ -5526,11 +5687,11 @@ S_simplify_sort(pTHX_ OP *o)
     if (kUNOP->op_first->op_type != OP_GV)
        return;
     kid = kUNOP->op_first;                             /* get past rv2sv */
-    if (GvSTASH(kGVOP->op_gv) != PL_curstash)
+    if (GvSTASH((GV*)kSVOP->op_sv) != PL_curstash)
        return;
-    if (strEQ(GvNAME(kGVOP->op_gv), "a"))
+    if (strEQ(GvNAME((GV*)kSVOP->op_sv), "a"))
        reversed = 0;
-    else if(strEQ(GvNAME(kGVOP->op_gv), "b"))
+    else if(strEQ(GvNAME((GV*)kSVOP->op_sv), "b"))
        reversed = 1;
     else
        return;
@@ -5541,10 +5702,10 @@ S_simplify_sort(pTHX_ OP *o)
     if (kUNOP->op_first->op_type != OP_GV)
        return;
     kid = kUNOP->op_first;                             /* get past rv2sv */
-    if (GvSTASH(kGVOP->op_gv) != PL_curstash
+    if (GvSTASH((GV*)kSVOP->op_sv) != PL_curstash
        || ( reversed
-           ? strNE(GvNAME(kGVOP->op_gv), "a")
-           : strNE(GvNAME(kGVOP->op_gv), "b")))
+           ? strNE(GvNAME((GV*)kSVOP->op_sv), "a")
+           : strNE(GvNAME((GV*)kSVOP->op_sv), "b")))
        return;
     o->op_flags &= ~(OPf_STACKED | OPf_SPECIAL);
     if (reversed)
@@ -5553,9 +5714,10 @@ S_simplify_sort(pTHX_ OP *o)
        o->op_private |= OPpSORT_NUMERIC;
     if (k->op_type == OP_I_NCMP)
        o->op_private |= OPpSORT_NUMERIC | OPpSORT_INTEGER;
-    op_free(cLISTOPo->op_first->op_sibling);   /* delete comparison block */
-    cLISTOPo->op_first->op_sibling = cLISTOPo->op_last;
-    cLISTOPo->op_children = 1;
+    kid = cLISTOPo->op_first->op_sibling;
+    cLISTOPo->op_first->op_sibling = kid->op_sibling; /* bypass old block */
+    op_free(kid);                                    /* then delete it */
+    cLISTOPo->op_children--;
 }
 
 OP *
@@ -5610,6 +5772,23 @@ Perl_ck_split(pTHX_ OP *o)
 }
 
 OP *
+Perl_ck_join(pTHX_ OP *o) 
+{
+    if (ckWARN(WARN_SYNTAX)) {
+       OP *kid = cLISTOPo->op_first->op_sibling;
+       if (kid && kid->op_type == OP_MATCH) {
+           char *pmstr = "STRING";
+           if (kPMOP->op_pmregexp)
+               pmstr = kPMOP->op_pmregexp->precomp;
+           Perl_warner(aTHX_ WARN_SYNTAX,
+                       "/%s/ should probably be written as \"%s\"",
+                       pmstr, pmstr);
+       }
+    }
+    return ck_fun(o);
+}
+
+OP *
 Perl_ck_subr(pTHX_ OP *o)
 {
     dTHR;
@@ -5624,6 +5803,7 @@ Perl_ck_subr(pTHX_ OP *o)
     I32 arg = 0;
     STRLEN n_a;
 
+    o->op_private |= OPpENTERSUB_HASTARG;
     for (cvop = o2; cvop->op_sibling; cvop = cvop->op_sibling) ;
     if (cvop->op_type == OP_RV2CV) {
        SVOP* tmpop;
@@ -5810,6 +5990,7 @@ Perl_peep(pTHX_ register OP *o)
     dTHR;
     register OP* oldop = 0;
     STRLEN n_a;
+    OP *last_composite = Nullop;
 
     if (!o || o->op_seq)
        return;
@@ -5828,6 +6009,7 @@ Perl_peep(pTHX_ register OP *o)
        case OP_DBSTATE:
            PL_curcop = ((COP*)o);              /* for warnings */
            o->op_seq = PL_op_seqmax++;
+           last_composite = Nullop;
            break;
 
        case OP_CONST:
@@ -5856,7 +6038,8 @@ Perl_peep(pTHX_ register OP *o)
                            && (((LISTOP*)o)->op_first->op_sibling->op_targ
                                == o->op_next->op_targ))) {
                        goto ignore_optimization;
-                   } else {
+                   }
+                   else {
                        o->op_targ = o->op_next->op_targ;
                        o->op_private |= OPpTARGET_MY;
                    }
@@ -5921,11 +6104,11 @@ Perl_peep(pTHX_ register OP *o)
                    o->op_type = OP_AELEMFAST;
                    o->op_ppaddr = PL_ppaddr[OP_AELEMFAST];
                    o->op_private = (U8)i;
-                   GvAVn(((GVOP*)o)->op_gv);
+                   GvAVn((GV*)((SVOP*)o)->op_sv);
                }
            }
            else if ((o->op_private & OPpEARLY_CV) && ckWARN(WARN_UNSAFE)) {
-               GV *gv = cGVOPo->op_gv;
+               GV *gv = (GV*)cSVOPo->op_sv;
                if (SvTYPE(gv) == SVt_PVGV && GvCV(gv) && SvPVX(GvCV(gv))) {
                    /* XXX could check prototype here instead of just carping */
                    SV *sv = sv_newmortal();
@@ -6010,7 +6193,7 @@ Perl_peep(pTHX_ register OP *o)
            key = SvPV(*svp, keylen);
            indsvp = hv_fetch(GvHV(*fields), key, keylen, FALSE);
            if (!indsvp) {
-               Perl_croak(aTHX_ "No such field \"%s\" in variable %s of type %s",
+               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);
@@ -6025,6 +6208,42 @@ Perl_peep(pTHX_ register OP *o)
            break;
        }
 
+       case OP_RV2AV:
+       case OP_RV2HV:
+           if (!(o->op_flags & OPf_WANT)
+               || (o->op_flags & OPf_WANT) == OPf_WANT_LIST)
+           {
+               last_composite = o;
+           }
+           o->op_seq = PL_op_seqmax++;
+           break;
+
+       case OP_RETURN:
+           if (o->op_next && o->op_next->op_type != OP_LEAVESUBLV) {
+               o->op_seq = PL_op_seqmax++;
+               break;
+           }
+           /* FALL THROUGH */
+
+       case OP_LEAVESUBLV:
+           if (last_composite) {
+               OP *r = last_composite;
+
+               while (r->op_sibling)
+                  r = r->op_sibling;
+               if (r->op_next == o 
+                   || (r->op_next->op_type == OP_LIST
+                       && r->op_next->op_next == o))
+               {
+                   if (last_composite->op_type == OP_RV2AV)
+                       yyerror("Lvalue subs returning arrays not implemented yet");
+                   else
+                       yyerror("Lvalue subs returning hashes not implemented yet");
+                       ;
+               }               
+           }
+           /* FALL THROUGH */
+
        default:
            o->op_seq = PL_op_seqmax++;
            break;