more complete pseudo-fork() support for Windows
[p5sagit/p5-mst-13.2.git] / pp_hot.c
index dbea9bd..690abea 100644 (file)
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -40,7 +40,7 @@ static void unset_cvowner(pTHXo_ void *cvarg);
 PP(pp_const)
 {
     djSP;
-    XPUSHs(cSVOP->op_sv);
+    XPUSHs(cSVOP_sv);
     RETURN;
 }
 
@@ -58,9 +58,9 @@ PP(pp_gvsv)
     djSP;
     EXTEND(SP,1);
     if (PL_op->op_private & OPpLVAL_INTRO)
-       PUSHs(save_scalar(cGVOP->op_gv));
+       PUSHs(save_scalar(cGVOP));
     else
-       PUSHs(GvSV(cGVOP->op_gv));
+       PUSHs(GvSV(cGVOP));
     RETURN;
 }
 
@@ -95,7 +95,7 @@ PP(pp_stringify)
 PP(pp_gv)
 {
     djSP;
-    XPUSHs((SV*)cGVOP->op_gv);
+    XPUSHs((SV*)cGVOP);
     RETURN;
 }
 
@@ -234,7 +234,7 @@ PP(pp_preinc)
 {
     djSP;
     if (SvREADONLY(TOPs) || SvTYPE(TOPs) > SVt_PVLV)
-       Perl_croak(aTHX_ PL_no_modify);
+       DIE(aTHX_ PL_no_modify);
     if (SvIOK_notUV(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs) &&
        SvIVX(TOPs) != IV_MAX)
     {
@@ -271,7 +271,7 @@ PP(pp_add)
 PP(pp_aelemfast)
 {
     djSP;
-    AV *av = GvAV((GV*)cSVOP->op_sv);
+    AV *av = GvAV(cGVOP);
     U32 lval = PL_op->op_flags & OPf_MOD;
     SV** svp = av_fetch(av, PL_op->op_private, lval);
     SV *sv = (svp ? *svp : &PL_sv_undef);
@@ -601,15 +601,9 @@ PP(pp_rv2hv)
        dTARGET;
        if (SvTYPE(hv) == SVt_PVAV)
            hv = avhv_keys((AV*)hv);
-#ifdef IV_IS_QUAD
        if (HvFILL(hv))
-            Perl_sv_setpvf(aTHX_ TARG, "%" PERL_PRId64 "/%" PERL_PRId64,
-                      (Quad_t)HvFILL(hv), (Quad_t)HvMAX(hv) + 1);
-#else
-       if (HvFILL(hv))
-            Perl_sv_setpvf(aTHX_ TARG, "%ld/%ld",
-                      (long)HvFILL(hv), (long)HvMAX(hv) + 1);
-#endif
+            Perl_sv_setpvf(aTHX_ TARG, "%"IVdf"/%"IVdf,
+                          (IV)HvFILL(hv), (IV)HvMAX(hv) + 1);
        else
            sv_setiv(TARG, 0);
        
@@ -1091,9 +1085,9 @@ Perl_do_readline(pTHX)
        if (!fp) {
            if (IoFLAGS(io) & IOf_ARGV) {
                if (IoFLAGS(io) & IOf_START) {
-                   IoFLAGS(io) &= ~IOf_START;
                    IoLINES(io) = 0;
                    if (av_len(GvAVn(PL_last_in_gv)) < 0) {
+                       IoFLAGS(io) &= ~IOf_START;
                        do_open(PL_last_in_gv,"-",1,FALSE,O_RDONLY,0,Nullfp);
                        sv_setpvn(GvSV(PL_last_in_gv), "-", 1);
                        SvSETMAGIC(GvSV(PL_last_in_gv));
@@ -1104,7 +1098,6 @@ Perl_do_readline(pTHX)
                fp = nextargv(PL_last_in_gv);
                if (!fp) { /* Note: fp != IoIFP(io) */
                    (void)do_close(PL_last_in_gv, FALSE); /* now it does*/
-                   IoFLAGS(io) |= IOf_START;
                }
            }
            else if (type == OP_GLOB) {
@@ -1196,6 +1189,11 @@ Perl_do_readline(pTHX)
                    }
                }
 #else /* !VMS */
+#ifdef MACOS_TRADITIONAL
+               sv_setpv(tmpcmd, "glob ");
+               sv_catsv(tmpcmd, tmpglob);
+               sv_catpv(tmpcmd, " |");
+#else
 #ifdef DOSISH
 #ifdef OS2
                sv_setpv(tmpcmd, "for a in ");
@@ -1227,6 +1225,7 @@ Perl_do_readline(pTHX)
 #endif
 #endif /* !CSH */
 #endif /* !DOSISH */
+#endif /* MACOS_TRADITIONAL */
                (void)do_open(PL_last_in_gv, SvPVX(tmpcmd), SvCUR(tmpcmd),
                              FALSE, O_RDONLY, 0, Nullfp);
                fp = IoIFP(io);
@@ -1302,7 +1301,6 @@ Perl_do_readline(pTHX)
                if (fp)
                    continue;
                (void)do_close(PL_last_in_gv, FALSE);
-               IoFLAGS(io) |= IOf_START;
            }
            else if (type == OP_GLOB) {
                if (!do_close(PL_last_in_gv, FALSE) && ckWARN(WARN_CLOSED)) {
@@ -1511,12 +1509,14 @@ PP(pp_iter)
     register PERL_CONTEXT *cx;
     SV* sv;
     AV* av;
+    SV **itersvp;
 
     EXTEND(SP, 1);
     cx = &cxstack[cxstack_ix];
     if (CxTYPE(cx) != CXt_LOOP)
        DIE(aTHX_ "panic: pp_iter");
 
+    itersvp = CxITERVAR(cx);
     av = cx->blk_loop.iterary;
     if (SvTYPE(av) != SVt_PVAV) {
        /* iterate ($min .. $max) */
@@ -1527,11 +1527,9 @@ PP(pp_iter)
            char *max = SvPV((SV*)av, maxlen);
            if (!SvNIOK(cur) && SvCUR(cur) <= maxlen) {
 #ifndef USE_THREADS                      /* don't risk potential race */
-               if (SvREFCNT(*cx->blk_loop.itervar) == 1
-                   && !SvMAGICAL(*cx->blk_loop.itervar))
-               {
+               if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
                    /* safe to reuse old SV */
-                   sv_setsv(*cx->blk_loop.itervar, cur);
+                   sv_setsv(*itersvp, cur);
                }
                else 
 #endif
@@ -1539,8 +1537,8 @@ PP(pp_iter)
                    /* we need a fresh SV every time so that loop body sees a
                     * completely new SV for closures/references to work as
                     * they used to */
-                   SvREFCNT_dec(*cx->blk_loop.itervar);
-                   *cx->blk_loop.itervar = newSVsv(cur);
+                   SvREFCNT_dec(*itersvp);
+                   *itersvp = newSVsv(cur);
                }
                if (strEQ(SvPVX(cur), max))
                    sv_setiv(cur, 0); /* terminate next time */
@@ -1555,11 +1553,9 @@ PP(pp_iter)
            RETPUSHNO;
 
 #ifndef USE_THREADS                      /* don't risk potential race */
-       if (SvREFCNT(*cx->blk_loop.itervar) == 1
-           && !SvMAGICAL(*cx->blk_loop.itervar))
-       {
+       if (SvREFCNT(*itersvp) == 1 && !SvMAGICAL(*itersvp)) {
            /* safe to reuse old SV */
-           sv_setiv(*cx->blk_loop.itervar, cx->blk_loop.iterix++);
+           sv_setiv(*itersvp, cx->blk_loop.iterix++);
        }
        else 
 #endif
@@ -1567,8 +1563,8 @@ PP(pp_iter)
            /* we need a fresh SV every time so that loop body sees a
             * completely new SV for closures/references to work as they
             * used to */
-           SvREFCNT_dec(*cx->blk_loop.itervar);
-           *cx->blk_loop.itervar = newSViv(cx->blk_loop.iterix++);
+           SvREFCNT_dec(*itersvp);
+           *itersvp = newSViv(cx->blk_loop.iterix++);
        }
        RETPUSHYES;
     }
@@ -1577,7 +1573,7 @@ PP(pp_iter)
     if (cx->blk_loop.iterix >= (av == PL_curstack ? cx->blk_oldsp : AvFILL(av)))
        RETPUSHNO;
 
-    SvREFCNT_dec(*cx->blk_loop.itervar);
+    SvREFCNT_dec(*itersvp);
 
     if (sv = (SvMAGICAL(av)) 
            ? *av_fetch(av, ++cx->blk_loop.iterix, FALSE) 
@@ -1605,7 +1601,7 @@ PP(pp_iter)
        sv = (SV*)lv;
     }
 
-    *cx->blk_loop.itervar = SvREFCNT_inc(sv);
+    *itersvp = SvREFCNT_inc(sv);
     RETPUSHYES;
 }
 
@@ -1645,7 +1641,7 @@ PP(pp_subst)
     if (SvREADONLY(TARG)
        || (SvTYPE(TARG) > SVt_PVLV
            && !(SvTYPE(TARG) == SVt_PVGV && SvFAKE(TARG))))
-       Perl_croak(aTHX_ PL_no_modify);
+       DIE(aTHX_ PL_no_modify);
     PUTBACK;
 
     s = SvPV(TARG, len);
@@ -1902,7 +1898,7 @@ PP(pp_grepwhile)
        SV *src;
 
        ENTER;                                  /* enter inner scope */
-       SAVESPTR(PL_curpm);
+       SAVEVPTR(PL_curpm);
 
        src = PL_stack_base[*PL_markstack_ptr];
        SvTEMP_off(src);
@@ -1920,16 +1916,15 @@ PP(pp_leavesub)
     PMOP *newpm;
     I32 gimme;
     register PERL_CONTEXT *cx;
-    struct block_sub cxsub;
+    SV *sv;
 
     POPBLOCK(cx,newpm);
-    POPSUB1(cx);       /* Delay POPSUB2 until stack values are safe */
  
     TAINT_NOT;
     if (gimme == G_SCALAR) {
        MARK = newsp + 1;
        if (MARK <= SP) {
-           if (cxsub.cv && CvDEPTH(cxsub.cv) > 1) {
+           if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
                if (SvTEMP(TOPs)) {
                    *MARK = SvREFCNT_inc(TOPs);
                    FREETMPS;
@@ -1959,10 +1954,11 @@ PP(pp_leavesub)
     }
     PUTBACK;
     
-    POPSUB2();         /* Stack values are safe: release CV and @_ ... */
+    POPSUB(cx,sv);     /* Stack values are safe: release CV and @_ ... */
     PL_curpm = newpm;  /* ... and pop $1 et al */
 
     LEAVE;
+    LEAVESUB(sv);
     return pop_return();
 }
 
@@ -1976,10 +1972,9 @@ PP(pp_leavesublv)
     PMOP *newpm;
     I32 gimme;
     register PERL_CONTEXT *cx;
-    struct block_sub cxsub;
+    SV *sv;
 
     POPBLOCK(cx,newpm);
-    POPSUB1(cx);       /* Delay POPSUB2 until stack values are safe */
  
     TAINT_NOT;
 
@@ -1994,7 +1989,7 @@ PP(pp_leavesublv)
        if (gimme == G_SCALAR)
            goto temporise;
        if (gimme == G_ARRAY) {
-           if (!CvLVALUE(cxsub.cv))
+           if (!CvLVALUE(cx->blk_sub.cv))
                goto temporise_array;
            EXTEND_MORTAL(SP - newsp);
            for (mark = newsp + 1; mark <= SP; mark++) {
@@ -2005,7 +2000,7 @@ PP(pp_leavesublv)
                else {
                    /* Can be a localized value subject to deletion. */
                    PL_tmps_stack[++PL_tmps_ix] = *mark;
-                   SvREFCNT_inc(*mark);
+                   (void)SvREFCNT_inc(*mark);
                }
            }
        }
@@ -2014,41 +2009,62 @@ PP(pp_leavesublv)
        /* Here we go for robustness, not for speed, so we change all
         * the refcounts so the caller gets a live guy. Cannot set
         * TEMP, so sv_2mortal is out of question. */
-       if (!CvLVALUE(cxsub.cv))
-           Perl_croak(aTHX_ "Can't modify non-lvalue subroutine call");
+       if (!CvLVALUE(cx->blk_sub.cv)) {
+           POPSUB(cx,sv);
+           PL_curpm = newpm;
+           LEAVE;
+           LEAVESUB(sv);
+           DIE(aTHX_ "Can't modify non-lvalue subroutine call");
+       }
        if (gimme == G_SCALAR) {
            MARK = newsp + 1;
            EXTEND_MORTAL(1);
            if (MARK == SP) {
-               if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY))
-                   Perl_croak(aTHX_ "Can't return a %s from lvalue subroutine",
+               if (SvFLAGS(TOPs) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
+                   POPSUB(cx,sv);
+                   PL_curpm = newpm;
+                   LEAVE;
+                   LEAVESUB(sv);
+                   DIE(aTHX_ "Can't return a %s from lvalue subroutine",
                        SvREADONLY(TOPs) ? "readonly value" : "temporary");
+               }
                else {                  /* Can be a localized value
                                         * subject to deletion. */
                    PL_tmps_stack[++PL_tmps_ix] = *mark;
-                   SvREFCNT_inc(*mark);
+                   (void)SvREFCNT_inc(*mark);
                }
            }
-           else                        /* Should not happen? */
-               Perl_croak(aTHX_ "%s returned from lvalue subroutine in scalar context",
+           else {                      /* Should not happen? */
+               POPSUB(cx,sv);
+               PL_curpm = newpm;
+               LEAVE;
+               LEAVESUB(sv);
+               DIE(aTHX_ "%s returned from lvalue subroutine in scalar context",
                    (MARK > SP ? "Empty array" : "Array"));
+           }
            SP = MARK;
        }
        else if (gimme == G_ARRAY) {
            EXTEND_MORTAL(SP - newsp);
            for (mark = newsp + 1; mark <= SP; mark++) {
-               if (SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY))
-               /* Might be flattened array after $#array =  */
-               Perl_croak(aTHX_ "Can't return %s from lvalue subroutine",
+               if (SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
+                   /* Might be flattened array after $#array =  */
+                   PUTBACK;
+                   POPSUB(cx,sv);
+                   PL_curpm = newpm;
+                   LEAVE;
+                   LEAVESUB(sv);
+                   DIE(aTHX_ "Can't return %s from lvalue subroutine",
                        (*mark != &PL_sv_undef)
                        ? (SvREADONLY(TOPs)
                            ? "a readonly value" : "a temporary")
                        : "an uninitialized value");
+               }
                else {
                    mortalize:
                    /* Can be a localized value subject to deletion. */
                    PL_tmps_stack[++PL_tmps_ix] = *mark;
-                   SvREFCNT_inc(*mark);
+                   (void)SvREFCNT_inc(*mark);
                }
            }
        }
@@ -2058,7 +2074,7 @@ PP(pp_leavesublv)
          temporise:
            MARK = newsp + 1;
            if (MARK <= SP) {
-               if (cxsub.cv && CvDEPTH(cxsub.cv) > 1) {
+               if (cx->blk_sub.cv && CvDEPTH(cx->blk_sub.cv) > 1) {
                    if (SvTEMP(TOPs)) {
                        *MARK = SvREFCNT_inc(TOPs);
                        FREETMPS;
@@ -2090,10 +2106,11 @@ PP(pp_leavesublv)
     }
     PUTBACK;
     
-    POPSUB2();         /* Stack values are safe: release CV and @_ ... */
+    POPSUB(cx,sv);     /* Stack values are safe: release CV and @_ ... */
     PL_curpm = newpm;  /* ... and pop $1 et al */
 
     LEAVE;
+    LEAVESUB(sv);
     return pop_return();
 }
 
@@ -2125,7 +2142,7 @@ S_get_db_sub(pTHX_ SV **svp, CV *cv)
        SvUPGRADE(dbsv, SVt_PVIV);
        SvIOK_on(dbsv);
        SAVEIV(SvIVX(dbsv));
-       SvIVX(dbsv) = (IV)PTR_CAST cv;  /* Do it the quickest way  */
+       SvIVX(dbsv) = PTR2IV(cv);       /* Do it the quickest way  */
     }
 
     if (CvXSUB(cv))
@@ -2258,7 +2275,7 @@ try_autoload:
                    || !(sv = AvARRAY(av)[0]))
                {
                    MUTEX_UNLOCK(CvMUTEXP(cv));
-                   Perl_croak(aTHX_ "no argument for locked method call");
+                   DIE(aTHX_ "no argument for locked method call");
                }
            }
            if (SvROK(sv))
@@ -2281,10 +2298,10 @@ try_autoload:
            while (MgOWNER(mg))
                COND_WAIT(MgOWNERCONDP(mg), MgMUTEXP(mg));
            MgOWNER(mg) = thr;
-           DEBUG_S(PerlIO_printf(PerlIO_stderr(), "%p: pp_entersub lock %p\n",
+           DEBUG_S(PerlIO_printf(Perl_debug_log, "%p: pp_entersub lock %p\n",
                                  thr, sv);)
            MUTEX_UNLOCK(MgMUTEXP(mg));
-           SAVEDESTRUCTOR(Perl_unlock_condpair, sv);
+           SAVEDESTRUCTOR_X(Perl_unlock_condpair, sv);
        }
        MUTEX_LOCK(CvMUTEXP(cv));
     }
@@ -2323,13 +2340,13 @@ try_autoload:
            /* We already have a clone to use */
            MUTEX_UNLOCK(CvMUTEXP(cv));
            cv = *(CV**)svp;
-           DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+           DEBUG_S(PerlIO_printf(Perl_debug_log,
                                  "entersub: %p already has clone %p:%s\n",
                                  thr, cv, SvPEEK((SV*)cv)));
            CvOWNER(cv) = thr;
            SvREFCNT_inc(cv);
            if (CvDEPTH(cv) == 0)
-               SAVEDESTRUCTOR(unset_cvowner, (void*) cv);
+               SAVEDESTRUCTOR_X(unset_cvowner, (void*) cv);
        }
        else {
            /* (2) => grab ownership of cv. (3) => make clone */
@@ -2337,7 +2354,7 @@ try_autoload:
                CvOWNER(cv) = thr;
                SvREFCNT_inc(cv);
                MUTEX_UNLOCK(CvMUTEXP(cv));
-               DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+               DEBUG_S(PerlIO_printf(Perl_debug_log,
                            "entersub: %p grabbing %p:%s in stash %s\n",
                            thr, cv, SvPEEK((SV*)cv), CvSTASH(cv) ?
                                HvNAME(CvSTASH(cv)) : "(none)"));
@@ -2347,7 +2364,7 @@ try_autoload:
                CV *clonecv;
                SvREFCNT_inc(cv); /* don't let it vanish from under us */
                MUTEX_UNLOCK(CvMUTEXP(cv));
-               DEBUG_S((PerlIO_printf(PerlIO_stderr(),
+               DEBUG_S((PerlIO_printf(Perl_debug_log,
                                       "entersub: %p cloning %p:%s\n",
                                       thr, cv, SvPEEK((SV*)cv))));
                /*
@@ -2365,9 +2382,9 @@ try_autoload:
                SvREFCNT_inc(cv);
            }
            DEBUG_S(if (CvDEPTH(cv) != 0)
-                       PerlIO_printf(PerlIO_stderr(), "depth %ld != 0\n",
+                       PerlIO_printf(Perl_debug_log, "depth %ld != 0\n",
                                      CvDEPTH(cv)););
-           SAVEDESTRUCTOR(unset_cvowner, (void*) cv);
+           SAVEDESTRUCTOR_X(unset_cvowner, (void*) cv);
        }
     }
 #endif /* USE_THREADS */
@@ -2384,7 +2401,7 @@ try_autoload:
                SP--;
            }
            PL_stack_sp = mark + 1;
-           fp3 = (I32(*)(int,int,int)))CvXSUB(cv;
+           fp3 = (I32(*)(int,int,int))CvXSUB(cv);
            items = (*fp3)(CvXSUBANY(cv).any_i32, 
                           MARK - PL_stack_base + 1,
                           items);
@@ -2420,7 +2437,7 @@ try_autoload:
            }
            /* We assume first XSUB in &DB::sub is the called one. */
            if (PL_curcopdb) {
-               SAVESPTR(PL_curcop);
+               SAVEVPTR(PL_curcop);
                PL_curcop = PL_curcopdb;
                PL_curcopdb = NULL;
            }
@@ -2456,14 +2473,16 @@ try_autoload:
        if (CvDEPTH(cv) < 2)
            (void)SvREFCNT_inc(cv);
        else {  /* save temporaries on recursion? */
+           PERL_STACK_OVERFLOW_CHECK();
            if (CvDEPTH(cv) > AvFILLp(padlist)) {
                AV *av;
                AV *newpad = newAV();
                SV **oldpad = AvARRAY(svp[CvDEPTH(cv)-1]);
                I32 ix = AvFILLp((AV*)svp[1]);
+               I32 names_fill = AvFILLp((AV*)svp[0]);
                svp = AvARRAY(svp[0]);
                for ( ;ix > 0; ix--) {
-                   if (svp[ix] != &PL_sv_undef) {
+                   if (names_fill >= ix && svp[ix] != &PL_sv_undef) {
                        char *name = SvPVX(svp[ix]);
                        if ((SvFLAGS(svp[ix]) & SVf_FAKE) /* outer lexical? */
                            || *name == '&')              /* anonymous code? */
@@ -2480,6 +2499,9 @@ try_autoload:
                            SvPADMY_on(sv);
                        }
                    }
+                   else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) {
+                       av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix]));
+                   }
                    else {
                        av_store(newpad, ix, sv = NEWSV(0,0));
                        SvPADTMP_on(sv);
@@ -2508,7 +2530,7 @@ try_autoload:
            }
        }
 #endif /* USE_THREADS */               
-       SAVESPTR(PL_curpad);
+       SAVEVPTR(PL_curpad);
        PL_curpad = AvARRAY((AV*)svp[CvDEPTH(cv)]);
 #ifndef USE_THREADS
        if (hasargs)
@@ -2518,11 +2540,13 @@ try_autoload:
            SV** ary;
 
 #if 0
-           DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+           DEBUG_S(PerlIO_printf(Perl_debug_log,
                                  "%p entersub preparing @_\n", thr));
 #endif
            av = (AV*)PL_curpad[0];
            if (AvREAL(av)) {
+               /* @_ is normally not REAL--this should only ever
+                * happen when DB::sub() calls things that modify @_ */
                av_clear(av);
                AvREAL_off(av);
                AvREIFY_on(av);
@@ -2564,7 +2588,7 @@ try_autoload:
            && !(PERLDB_SUB && cv == GvCV(PL_DBsub)))
            sub_crush_depth(cv);
 #if 0
-       DEBUG_S(PerlIO_printf(PerlIO_stderr(),
+       DEBUG_S(PerlIO_printf(Perl_debug_log,
                              "%p entersub returning %p\n", thr, CvSTART(cv)));
 #endif
        RETURNOP(CvSTART(cv));
@@ -2760,7 +2784,7 @@ S_method_common(pTHX_ SV* meth, U32* hashp)
                sep = p, leaf = p + 2;
        }
        if (!sep || ((sep - name) == 5 && strnEQ(name, "SUPER", 5))) {
-           packname = HvNAME(sep ? PL_curcop->cop_stash : stash);
+           packname = sep ? CopSTASHPV(PL_curcop) : HvNAME(stash);
            packlen = strlen(packname);
        }
        else {
@@ -2783,11 +2807,11 @@ unset_cvowner(pTHXo_ void *cvarg)
     dTHR;
 #endif /* DEBUGGING */
 
-    DEBUG_S((PerlIO_printf(PerlIO_stderr(), "%p unsetting CvOWNER of %p:%s\n",
+    DEBUG_S((PerlIO_printf(Perl_debug_log, "%p unsetting CvOWNER of %p:%s\n",
                           thr, cv, SvPEEK((SV*)cv))));
     MUTEX_LOCK(CvMUTEXP(cv));
     DEBUG_S(if (CvDEPTH(cv) != 0)
-               PerlIO_printf(PerlIO_stderr(), "depth %ld != 0\n",
+               PerlIO_printf(Perl_debug_log, "depth %ld != 0\n",
                              CvDEPTH(cv)););
     assert(thr == CvOWNER(cv));
     CvOWNER(cv) = 0;