This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Document SvGAMAGIC(), and its significance w.r.t. the side effects of
[perl5.git] / pp_ctl.c
index 4761ded..f88d401 100644 (file)
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -75,7 +75,7 @@ PP(pp_regcomp)
     dSP;
     register PMOP *pm = (PMOP*)cLOGOP->op_other;
     SV *tmpstr;
-    MAGIC *mg = Null(MAGIC*);
+    MAGIC *mg = NULL;
 
     /* prevent recompiling under /o and ithreads. */
 #if defined(USE_ITHREADS)
@@ -113,7 +113,7 @@ PP(pp_regcomp)
        tmpstr = POPs;
 
     if (SvROK(tmpstr)) {
-       SV *sv = SvRV(tmpstr);
+       SV * const sv = SvRV(tmpstr);
        if(SvMAGICAL(sv))
            mg = mg_find(sv, PERL_MAGIC_qr);
     }
@@ -125,15 +125,15 @@ PP(pp_regcomp)
     else {
        STRLEN len;
        const char *t = SvPV_const(tmpstr, len);
+       regexp * const re = PM_GETRE(pm);
 
        /* Check against the last compiled regexp. */
-       if (!PM_GETRE(pm) || !PM_GETRE(pm)->precomp ||
-           PM_GETRE(pm)->prelen != (I32)len ||
-           memNE(PM_GETRE(pm)->precomp, t, len))
+       if (!re || !re->precomp || re->prelen != (I32)len ||
+           memNE(re->precomp, t, len))
        {
-           if (PM_GETRE(pm)) {
-               ReREFCNT_dec(PM_GETRE(pm));
-               PM_SETRE(pm, Null(REGEXP*));    /* crucial if regcomp aborts */
+           if (re) {
+               ReREFCNT_dec(re);
+               PM_SETRE(pm, NULL);     /* crucial if regcomp aborts */
            }
            if (PL_op->op_flags & OPf_SPECIAL)
                PL_reginterp_cnt = I32_MAX; /* Mark as safe.  */
@@ -284,8 +284,12 @@ PP(pp_substcont)
        if (SvTYPE(sv) < SVt_PVMG)
            SvUPGRADE(sv, SVt_PVMG);
        if (!(mg = mg_find(sv, PERL_MAGIC_regex_global))) {
-           sv_magic(sv, NULL, PERL_MAGIC_regex_global, NULL, 0);
-           mg = mg_find(sv, PERL_MAGIC_regex_global);
+#ifdef PERL_OLD_COPY_ON_WRITE
+           if (SvIsCOW(lsv))
+               sv_force_normal_flags(sv, 0);
+#endif
+           mg = sv_magicext(sv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
+                            NULL, 0);
        }
        i = m - orig;
        if (DO_UTF8(sv))
@@ -304,6 +308,7 @@ Perl_rxres_save(pTHX_ void **rsp, REGEXP *rx)
 {
     UV *p = (UV*)*rsp;
     U32 i;
+    PERL_UNUSED_CONTEXT;
 
     if (!p || p[1] < rx->nparens) {
 #ifdef PERL_OLD_COPY_ON_WRITE
@@ -341,6 +346,7 @@ Perl_rxres_restore(pTHX_ void **rsp, REGEXP *rx)
 {
     UV *p = (UV*)*rsp;
     U32 i;
+    PERL_UNUSED_CONTEXT;
 
     RX_MATCH_COPY_FREE(rx);
     RX_MATCH_COPIED_set(rx, *p);
@@ -367,13 +373,14 @@ void
 Perl_rxres_free(pTHX_ void **rsp)
 {
     UV * const p = (UV*)*rsp;
+    PERL_UNUSED_CONTEXT;
 
     if (p) {
 #ifdef PERL_POISON
        void *tmp = INT2PTR(char*,*p);
        Safefree(tmp);
        if (*p)
-           Poison(*p, 1, sizeof(*p));
+           PoisonFree(*p, 1, sizeof(*p));
 #else
        Safefree(INT2PTR(char*,*p));
 #endif
@@ -383,7 +390,7 @@ Perl_rxres_free(pTHX_ void **rsp)
        }
 #endif
        Safefree(p);
-       *rsp = Null(void*);
+       *rsp = NULL;
     }
 }
 
@@ -824,7 +831,11 @@ PP(pp_formline)
            /* Formats aren't yet marked for locales, so assume "yes". */
            {
                STORE_NUMERIC_STANDARD_SET_LOCAL();
+#ifdef USE_SNPRINTF
+               snprintf(t, SvLEN(PL_formtarget) - (t - SvPVX(PL_formtarget)), fmt, (int) fieldsize, (int) arg & 255, value);
+#else
                sprintf(t, fmt, (int) fieldsize, (int) arg & 255, value);
+#endif /* ifdef USE_SNPRINTF */
                RESTORE_NUMERIC_STANDARD();
            }
            t += fieldsize;
@@ -1078,7 +1089,7 @@ PP(pp_flip)
                flip = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
            }
            else {
-               GV * const gv = gv_fetchpv(".", TRUE, SVt_PV);
+               GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
                if (gv && GvSV(gv))
                    flip = SvIV(sv) == SvIV(GvSV(gv));
            }
@@ -1172,7 +1183,7 @@ PP(pp_flop)
                flop = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
            }
            else {
-               GV * const gv = gv_fetchpv(".", TRUE, SVt_PV);
+               GV * const gv = gv_fetchpvs(".", GV_ADD|GV_NOTQUAL, SVt_PV);
                if (gv && GvSV(gv)) flop = SvIV(sv) == SvIV(GvSV(gv));
            }
        }
@@ -1443,7 +1454,7 @@ Perl_qerror(pTHX_ SV *err)
     else if (PL_errors)
        sv_catsv(PL_errors, err);
     else
-       Perl_warn(aTHX_ "%"SVf, err);
+       Perl_warn(aTHX_ "%"SVf, (void*)err);
     ++PL_error_count;
 }
 
@@ -1613,7 +1624,7 @@ PP(pp_caller)
        RETURN;
     }
 
-    EXTEND(SP, 10);
+    EXTEND(SP, 11);
 
     if (!stashname)
        PUSHs(&PL_sv_undef);
@@ -1674,7 +1685,7 @@ PP(pp_caller)
        const int off = AvARRAY(ary) - AvALLOC(ary);
 
        if (!PL_dbargs) {
-           GV* const tmpgv = gv_fetchpv("DB::args", TRUE, SVt_PVAV);
+           GV* const tmpgv = gv_fetchpvs("DB::args", GV_ADD, SVt_PVAV);
            PL_dbargs = GvAV(gv_AVadd(tmpgv));
            GvMULTI_on(tmpgv);
            AvREAL_off(PL_dbargs);      /* XXX should be REIFY (see av.h) */
@@ -1688,11 +1699,10 @@ PP(pp_caller)
     /* XXX only hints propagated via op_private are currently
      * visible (others are not easily accessible, since they
      * use the global PL_hints) */
-    PUSHs(sv_2mortal(newSViv((I32)cx->blk_oldcop->op_private &
-                            HINT_PRIVATE_MASK)));
+    PUSHs(sv_2mortal(newSViv(CopHINTS_get(cx->blk_oldcop))));
     {
        SV * mask ;
-       SV * const old_warnings = cx->blk_oldcop->cop_warnings ;
+       STRLEN * const old_warnings = cx->blk_oldcop->cop_warnings ;
 
        if  (old_warnings == pWARN_NONE ||
                (old_warnings == pWARN_STD && (PL_dowarn & G_WARN_ON) == 0))
@@ -1711,9 +1721,15 @@ PP(pp_caller)
            }
        }
         else
-            mask = newSVsv(old_warnings);
+            mask = newSVpvn((char *) (old_warnings + 1), old_warnings[0]);
         PUSHs(sv_2mortal(mask));
     }
+
+    PUSHs(cx->blk_oldcop->cop_hints ?
+         sv_2mortal(newRV_noinc(
+               (SV*)Perl_refcounted_he_chain_2hv(aTHX_
+                                                 cx->blk_oldcop->cop_hints)))
+         : &PL_sv_undef);
     RETURN;
 }
 
@@ -1763,7 +1779,7 @@ PP(pp_dbstate)
        hasargs = 0;
        SPAGAIN;
 
-       if (CvXSUB(cv)) {
+       if (CvISXSUB(cv)) {
            CvDEPTH(cv)++;
            PUSHMARK(SP);
            (void)(*CvXSUB(cv))(aTHX_ cv);
@@ -1913,7 +1929,7 @@ PP(pp_leaveloop)
 
     TAINT_NOT;
     if (gimme == G_VOID)
-       ; /* do nothing */
+       NOOP;
     else if (gimme == G_SCALAR) {
        if (mark < SP)
            *++newsp = sv_mortalcopy(*SP);
@@ -2000,7 +2016,7 @@ PP(pp_return)
            /* Unassume the success we assumed earlier. */
            SV * const nsv = cx->blk_eval.old_namesv;
            (void)hv_delete(GvHVn(PL_incgv), SvPVX_const(nsv), SvCUR(nsv), G_DISCARD);
-           DIE(aTHX_ "%"SVf" did not return a true value", nsv);
+           DIE(aTHX_ "%"SVf" did not return a true value", (void*)nsv);
        }
        break;
     case CXt_FORMAT:
@@ -2308,13 +2324,13 @@ PP(pp_goto)
                        goto retry;
                    tmpstr = sv_newmortal();
                    gv_efullname3(tmpstr, gv, NULL);
-                   DIE(aTHX_ "Goto undefined subroutine &%"SVf"",tmpstr);
+                   DIE(aTHX_ "Goto undefined subroutine &%"SVf"",(void*)tmpstr);
                }
                DIE(aTHX_ "Goto undefined subroutine");
            }
 
            /* First do some returnish stuff. */
-           (void)SvREFCNT_inc(cv); /* avoid premature free during unwind */
+           SvREFCNT_inc_simple_void(cv); /* avoid premature free during unwind */
            FREETMPS;
            cxix = dopoptosub(cxstack_ix);
            if (cxix < 0)
@@ -2352,7 +2368,7 @@ PP(pp_goto)
                    PAD_SVl(0) = (SV*)(cx->blk_sub.argarray = av);
                }
            }
-           else if (CvXSUB(cv)) {      /* put GvAV(defgv) back onto stack */
+           else if (CvISXSUB(cv)) {    /* put GvAV(defgv) back onto stack */
                AV* const av = GvAV(PL_defgv);
                items = AvFILLp(av) + 1;
                EXTEND(SP, items+1); /* @_ could have been extended. */
@@ -2369,47 +2385,27 @@ PP(pp_goto)
            /* Now do some callish stuff. */
            SAVETMPS;
            SAVEFREESV(cv); /* later, undo the 'avoid premature free' hack */
-           if (CvXSUB(cv)) {
-               OP* retop = cx->blk_sub.retop;
+           if (CvISXSUB(cv)) {
+               OP* const retop = cx->blk_sub.retop;
+               SV **newsp;
+               I32 gimme;
                if (reified) {
                    I32 index;
                    for (index=0; index<items; index++)
                        sv_2mortal(SP[-index]);
                }
-#ifdef PERL_XSUB_OLDSTYLE
-               if (CvOLDSTYLE(cv)) {
-                   I32 (*fp3)(int,int,int);
-                   while (SP > mark) {
-                       SP[1] = SP[0];
-                       SP--;
-                   }
-                   fp3 = (I32(*)(int,int,int))CvXSUB(cv);
-                   items = (*fp3)(CvXSUBANY(cv).any_i32,
-                                  mark - PL_stack_base + 1,
-                                  items);
-                   SP = PL_stack_base + items;
-               }
-               else
-#endif /* PERL_XSUB_OLDSTYLE */
-               {
-                   SV **newsp;
-                   I32 gimme;
 
-                   /* XS subs don't have a CxSUB, so pop it */
-                   POPBLOCK(cx, PL_curpm);
-                   /* Push a mark for the start of arglist */
-                   PUSHMARK(mark);
-                   PUTBACK;
-                   (void)(*CvXSUB(cv))(aTHX_ cv);
-                   /* Put these at the bottom since the vars are set but not used */
-                   PERL_UNUSED_VAR(newsp);
-                   PERL_UNUSED_VAR(gimme);
-               }
+               /* XS subs don't have a CxSUB, so pop it */
+               POPBLOCK(cx, PL_curpm);
+               /* Push a mark for the start of arglist */
+               PUSHMARK(mark);
+               PUTBACK;
+               (void)(*CvXSUB(cv))(aTHX_ cv);
                LEAVE;
                return retop;
            }
            else {
-               AV* padlist = CvPADLIST(cv);
+               AV* const padlist = CvPADLIST(cv);
                if (CxTYPE(cx) == CXt_EVAL) {
                    PL_in_eval = cx->blk_eval.old_in_eval;
                    PL_eval_root = cx->blk_eval.old_eval_root;
@@ -2417,11 +2413,11 @@ PP(pp_goto)
                    cx->blk_sub.hasargs = 0;
                }
                cx->blk_sub.cv = cv;
-               cx->blk_sub.olddepth = (U16)CvDEPTH(cv);
+               cx->blk_sub.olddepth = CvDEPTH(cv);
 
                CvDEPTH(cv)++;
                if (CvDEPTH(cv) < 2)
-                   (void)SvREFCNT_inc(cv);
+                   SvREFCNT_inc_void_NN(cv);
                else {
                    if (CvDEPTH(cv) == 100 && ckWARN(WARN_RECURSION))
                        sub_crush_depth(cv);
@@ -2431,16 +2427,15 @@ PP(pp_goto)
                PAD_SET_CUR_NOSAVE(padlist, CvDEPTH(cv));
                if (cx->blk_sub.hasargs)
                {
-                   AV* av = (AV*)PAD_SVl(0);
-                   SV** ary;
+                   AV* const av = (AV*)PAD_SVl(0);
 
                    cx->blk_sub.savearray = GvAV(PL_defgv);
-                   GvAV(PL_defgv) = (AV*)SvREFCNT_inc(av);
+                   GvAV(PL_defgv) = (AV*)SvREFCNT_inc_simple(av);
                    CX_CURPAD_SAVE(cx->blk_sub);
                    cx->blk_sub.argarray = av;
 
                    if (items >= AvMAX(av) + 1) {
-                       ary = AvALLOC(av);
+                       SV **ary = AvALLOC(av);
                        if (AvARRAY(av) != ary) {
                            AvMAX(av) += AvARRAY(av) - AvALLOC(av);
                            SvPV_set(av, (char*)ary);
@@ -2473,8 +2468,6 @@ PP(pp_goto)
                     * it's for informational purposes only.
                     */
                    SV * const sv = GvSV(PL_DBsub);
-                   CV *gotocv;
-
                    save_item(sv);
                    if (PERLDB_SUB_NN) {
                        const int type = SvTYPE(sv);
@@ -2485,11 +2478,13 @@ PP(pp_goto)
                    } else {
                        gv_efullname3(sv, CvGV(cv), NULL);
                    }
-                   if (  PERLDB_GOTO
-                         && (gotocv = get_cv("DB::goto", FALSE)) ) {
-                       PUSHMARK( PL_stack_sp );
-                       call_sv((SV*)gotocv, G_SCALAR | G_NODEBUG);
-                       PL_stack_sp--;
+                   if (PERLDB_GOTO) {
+                       CV * const gotocv = get_cv("DB::goto", FALSE);
+                       if (gotocv) {
+                           PUSHMARK( PL_stack_sp );
+                           call_sv((SV*)gotocv, G_SCALAR | G_NODEBUG);
+                           PL_stack_sp--;
+                       }
                    }
                }
                RETURNOP(CvSTART(cv));
@@ -2516,7 +2511,7 @@ PP(pp_goto)
 
        /* find label */
 
-       PL_lastgotoprobe = 0;
+       PL_lastgotoprobe = NULL;
        *enterops = 0;
        for (ix = cxstack_ix; ix >= 0; ix--) {
            cx = &cxstack[ix];
@@ -2643,7 +2638,13 @@ PP(pp_exit)
 #endif
     }
     PL_exit_flags |= PERL_EXIT_EXPECTED;
+#ifdef PERL_MAD
+    /* KLUDGE: disable exit 0 in BEGIN blocks when we're just compiling */
+    if (anum || !(PL_minus_c && PL_madskills))
+       my_exit(anum);
+#else
     my_exit(anum);
+#endif
     PUSHs(&PL_sv_undef);
     RETURN;
 }
@@ -2730,7 +2731,7 @@ S_docatch(pTHX_ OP *o)
     }
     JMPENV_POP;
     PL_op = oldop;
-    return Nullop;
+    return NULL;
 }
 
 OP *
@@ -2751,7 +2752,7 @@ Perl_sv_compile_2op(pTHX_ SV *sv, OP** startop, const char *code, PAD** padp)
     char *tmpbuf = tbuf;
     char *safestr;
     int runtime;
-    CV* runcv = Nullcv;        /* initialise to avoid compiler warnings */
+    CV* runcv = NULL;  /* initialise to avoid compiler warnings */
     STRLEN len;
 
     ENTER;
@@ -2772,8 +2773,13 @@ Perl_sv_compile_2op(pTHX_ SV *sv, OP** startop, const char *code, PAD** padp)
        len = SvCUR(sv);
     }
     else
+#ifdef USE_SNPRINTF
+       len = snprintf(tmpbuf, sizeof(tbuf), "_<(%.10s_eval %lu)", code,
+                      (unsigned long)++PL_evalseq);
+#else
        len = my_sprintf(tmpbuf, "_<(%.10s_eval %lu)", code,
                         (unsigned long)++PL_evalseq);
+#endif /* ifdef USE_SNPRINTF */
     SAVECOPFILE_FREE(&PL_compiling);
     CopFILE_set(&PL_compiling, tmpbuf+2);
     SAVECOPLINE(&PL_compiling);
@@ -2801,7 +2807,7 @@ Perl_sv_compile_2op(pTHX_ SV *sv, OP** startop, const char *code, PAD** padp)
     PL_op->op_type = OP_ENTEREVAL;
     PL_op->op_flags = 0;                       /* Avoid uninit warning. */
     PUSHBLOCK(cx, CXt_EVAL|(IN_PERL_COMPILETIME ? 0 : CXp_REAL), SP);
-    PUSHEVAL(cx, 0, Nullgv);
+    PUSHEVAL(cx, 0, NULL);
 
     if (runtime)
        rop = doeval(G_SCALAR, startop, runcv, PL_curcop->cop_seq);
@@ -2814,10 +2820,10 @@ Perl_sv_compile_2op(pTHX_ SV *sv, OP** startop, const char *code, PAD** padp)
     (*startop)->op_ppaddr = PL_ppaddr[OP_NULL];
     lex_end();
     /* XXX DAPM do this properly one year */
-    *padp = (AV*)SvREFCNT_inc(PL_comppad);
+    *padp = (AV*)SvREFCNT_inc_simple(PL_comppad);
     LEAVE;
     if (IN_PERL_COMPILETIME)
-       PL_compiling.op_private = (U8)(PL_hints & HINT_PRIVATE_MASK);
+       CopHINTS_set(&PL_compiling, PL_hints);
 #ifdef OP_IN_REGISTER
     op = PL_opsave;
 #endif
@@ -2896,14 +2902,16 @@ S_doeval(pTHX_ int gimme, OP** startop, CV* outside, U32 seq)
     cxstack[cxstack_ix].blk_eval.cv = PL_compcv;
 
     CvOUTSIDE_SEQ(PL_compcv) = seq;
-    CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc(outside);
+    CvOUTSIDE(PL_compcv) = (CV*)SvREFCNT_inc_simple(outside);
 
     /* set up a scratch pad */
 
     CvPADLIST(PL_compcv) = pad_new(padnew_SAVE);
+    PL_op = NULL; /* avoid PL_op and PL_curpad referring to different CVs */
 
 
-    SAVEMORTALIZESV(PL_compcv);        /* must remain until end of current statement */
+    if (!PL_madskills)
+       SAVEMORTALIZESV(PL_compcv);     /* must remain until end of current statement */
 
     /* make sure we compile in the right package */
 
@@ -2916,13 +2924,18 @@ S_doeval(pTHX_ int gimme, OP** startop, CV* outside, U32 seq)
     SAVEFREESV(PL_beginav);
     SAVEI32(PL_error_count);
 
+#ifdef PERL_MAD
+    SAVEI32(PL_madskills);
+    PL_madskills = 0;
+#endif
+
     /* try to compile it */
 
-    PL_eval_root = Nullop;
+    PL_eval_root = NULL;
     PL_error_count = 0;
     PL_curcop = &PL_compiling;
-    PL_curcop->cop_arybase = 0;
-    if (saveop && saveop->op_type != OP_REQUIRE && saveop->op_flags & OPf_SPECIAL)
+    CopARYBASE_set(PL_curcop, 0);
+    if (saveop && (saveop->op_type != OP_REQUIRE) && (saveop->op_flags & OPf_SPECIAL))
        PL_in_eval |= EVAL_KEEPERR;
     else
        sv_setpvn(ERRSV,"",0);
@@ -2935,7 +2948,7 @@ S_doeval(pTHX_ int gimme, OP** startop, CV* outside, U32 seq)
        PL_op = saveop;
        if (PL_eval_root) {
            op_free(PL_eval_root);
-           PL_eval_root = Nullop;
+           PL_eval_root = NULL;
        }
        SP = PL_stack_base + POPMARK;           /* pop original mark */
        if (!startop) {
@@ -2991,7 +3004,7 @@ S_doeval(pTHX_ int gimme, OP** startop, CV* outside, U32 seq)
     DEBUG_x(dump_eval());
 
     /* Register with debugger: */
-    if (PERLDB_INTER && saveop->op_type == OP_REQUIRE) {
+    if (PERLDB_INTER && saveop && saveop->op_type == OP_REQUIRE) {
        CV * const cv = get_cv("DB::postponed", FALSE);
        if (cv) {
            dSP;
@@ -3013,18 +3026,15 @@ S_doeval(pTHX_ int gimme, OP** startop, CV* outside, U32 seq)
 }
 
 STATIC PerlIO *
-S_check_type_and_open(pTHX_ const char *name, const char *mode)
+S_check_type_and_open(const char *name, const char *mode)
 {
     Stat_t st;
     const int st_rc = PerlLIO_stat(name, &st);
-    if (st_rc < 0) {
-       return Nullfp;
-    }
 
-    if(S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) {
-       Perl_die(aTHX_ "%s %s not allowed in require",
-           S_ISDIR(st.st_mode) ? "Directory" : "Block device", name);
+    if (st_rc < 0 || S_ISDIR(st.st_mode) || S_ISBLK(st.st_mode)) {
+       return NULL;
     }
+
     return PerlIO_open(name, mode);
 }
 
@@ -3043,15 +3053,7 @@ S_doopen_pm(pTHX_ const char *name, const char *mode)
            fp = check_type_and_open(name, mode);
        }
        else {
-           Stat_t pmstat;
-           if (PerlLIO_stat(name, &pmstat) < 0 ||
-               pmstat.st_mtime < pmcstat.st_mtime)
-           {
-               fp = check_type_and_open(pmc, mode);
-           }
-           else {
-               fp = check_type_and_open(name, mode);
-           }
+           fp = check_type_and_open(pmc, mode);
        }
        SvREFCNT_dec(pmcsv);
     }
@@ -3076,7 +3078,7 @@ PP(pp_require)
     const I32 gimme = GIMME_V;
     int filter_has_file = 0;
     PerlIO *tryrsfp = NULL;
-    GV *filter_child_proc = NULL;
+    SV *filter_cache = NULL;
     SV *filter_state = NULL;
     SV *filter_sub = NULL;
     SV *hook_sv = NULL;
@@ -3091,16 +3093,16 @@ PP(pp_require)
 
        sv = new_version(sv);
        if (!sv_derived_from(PL_patchlevel, "version"))
-           (void *)upg_version(PL_patchlevel);
+           upg_version(PL_patchlevel);
        if (cUNOP->op_first->op_type == OP_CONST && cUNOP->op_first->op_private & OPpCONST_NOVER) {
            if ( vcmp(sv,PL_patchlevel) < 0 )
                DIE(aTHX_ "Perls since %"SVf" too modern--this is %"SVf", stopped",
-                   vnormal(sv), vnormal(PL_patchlevel));
+                   (void*)vnormal(sv), (void*)vnormal(PL_patchlevel));
        }
        else {
            if ( vcmp(sv,PL_patchlevel) > 0 )
                DIE(aTHX_ "Perl %"SVf" required--this is only %"SVf", stopped",
-                   vnormal(sv), vnormal(PL_patchlevel));
+                   (void*)vnormal(sv), (void*)vnormal(PL_patchlevel));
        }
 
            RETPUSHYES;
@@ -3146,7 +3148,7 @@ PP(pp_require)
        {
            namesv = newSV(0);
            for (i = 0; i <= AvFILL(ar); i++) {
-               SV *dirsv = *av_fetch(ar, i, TRUE);
+               SV * const dirsv = *av_fetch(ar, i, TRUE);
 
                if (SvROK(dirsv)) {
                    int count;
@@ -3184,34 +3186,32 @@ PP(pp_require)
                        SP -= count - 1;
                        arg = SP[i++];
 
+                       if (SvROK(arg) && (SvTYPE(SvRV(arg)) <= SVt_PVLV)
+                           && !isGV_with_GP(SvRV(arg))) {
+                           filter_cache = SvRV(arg);
+                           SvREFCNT_inc_void_NN(filter_cache);
+
+                           if (i < count) {
+                               arg = SP[i++];
+                           }
+                       }
+
                        if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVGV) {
                            arg = SvRV(arg);
                        }
 
                        if (SvTYPE(arg) == SVt_PVGV) {
-                           IO *io = GvIO((GV *)arg);
+                           IO * const io = GvIO((GV *)arg);
 
                            ++filter_has_file;
 
                            if (io) {
                                tryrsfp = IoIFP(io);
-                               if (IoTYPE(io) == IoTYPE_PIPE) {
-                                   /* reading from a child process doesn't
-                                      nest -- when returning from reading
-                                      the inner module, the outer one is
-                                      unreadable (closed?)  I've tried to
-                                      save the gv to manage the lifespan of
-                                      the pipe, but this didn't help. XXX */
-                                   filter_child_proc = (GV *)arg;
-                                   (void)SvREFCNT_inc(filter_child_proc);
-                               }
-                               else {
-                                   if (IoOFP(io) && IoOFP(io) != IoIFP(io)) {
-                                       PerlIO_close(IoOFP(io));
-                                   }
-                                   IoIFP(io) = Nullfp;
-                                   IoOFP(io) = Nullfp;
+                               if (IoOFP(io) && IoOFP(io) != IoIFP(io)) {
+                                   PerlIO_close(IoOFP(io));
                                }
+                               IoIFP(io) = NULL;
+                               IoOFP(io) = NULL;
                            }
 
                            if (i < count) {
@@ -3221,16 +3221,17 @@ PP(pp_require)
 
                        if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVCV) {
                            filter_sub = arg;
-                           (void)SvREFCNT_inc(filter_sub);
+                           SvREFCNT_inc_void_NN(filter_sub);
 
                            if (i < count) {
                                filter_state = SP[i];
-                               (void)SvREFCNT_inc(filter_state);
+                               SvREFCNT_inc_simple_void(filter_state);
                            }
+                       }
 
-                           if (!tryrsfp) {
-                               tryrsfp = PerlIO_open("/dev/null", PERL_SCRIPT_MODE);
-                           }
+                       if (!tryrsfp && (filter_cache || filter_sub)) {
+                           tryrsfp = PerlIO_open(BIT_BUCKET,
+                                                 PERL_SCRIPT_MODE);
                        }
                        SP--;
                    }
@@ -3245,9 +3246,9 @@ PP(pp_require)
                    }
 
                    filter_has_file = 0;
-                   if (filter_child_proc) {
-                       SvREFCNT_dec(filter_child_proc);
-                       filter_child_proc = NULL;
+                   if (filter_cache) {
+                       SvREFCNT_dec(filter_cache);
+                       filter_cache = NULL;
                    }
                    if (filter_state) {
                        SvREFCNT_dec(filter_state);
@@ -3360,7 +3361,7 @@ PP(pp_require)
     } else {
        SV** const svp = hv_fetch(GvHVn(PL_incgv), name, len, 0);
        if (!svp)
-           (void)hv_store(GvHVn(PL_incgv), name, len, SvREFCNT_inc(hook_sv), 0 );
+           (void)hv_store(GvHVn(PL_incgv), name, len, SvREFCNT_inc_simple(hook_sv), 0 );
     }
 
     ENTER;
@@ -3372,29 +3373,31 @@ PP(pp_require)
     PL_rsfp = tryrsfp;
     SAVEHINTS();
     PL_hints = 0;
-    SAVESPTR(PL_compiling.cop_warnings);
+    SAVECOMPILEWARNINGS();
     if (PL_dowarn & G_WARN_ALL_ON)
         PL_compiling.cop_warnings = pWARN_ALL ;
     else if (PL_dowarn & G_WARN_ALL_OFF)
         PL_compiling.cop_warnings = pWARN_NONE ;
-    else if (PL_taint_warn)
-        PL_compiling.cop_warnings = newSVpvn(WARN_TAINTstring, WARNsize);
+    else if (PL_taint_warn) {
+        PL_compiling.cop_warnings
+           = Perl_new_warnings_bitfield(aTHX_ NULL, WARN_TAINTstring, WARNsize);
+    }
     else
         PL_compiling.cop_warnings = pWARN_STD ;
     SAVESPTR(PL_compiling.cop_io);
     PL_compiling.cop_io = NULL;
 
-    if (filter_sub || filter_child_proc) {
+    if (filter_sub || filter_cache) {
        SV * const datasv = filter_add(S_run_user_filter, NULL);
        IoLINES(datasv) = filter_has_file;
-       IoFMT_GV(datasv) = (GV *)filter_child_proc;
        IoTOP_GV(datasv) = (GV *)filter_state;
        IoBOTTOM_GV(datasv) = (GV *)filter_sub;
+       IoFMT_GV(datasv) = (GV *)filter_cache;
     }
 
     /* switch to eval mode */
     PUSHBLOCK(cx, CXt_EVAL, SP);
-    PUSHEVAL(cx, name, Nullgv);
+    PUSHEVAL(cx, name, NULL);
     cx->blk_eval.retop = PL_op->op_next;
 
     SAVECOPLINE(&PL_compiling);
@@ -3406,7 +3409,7 @@ PP(pp_require)
     encoding = PL_encoding;
     PL_encoding = NULL;
 
-    op = DOCATCH(doeval(gimme, NULL, Nullcv, PL_curcop->cop_seq));
+    op = DOCATCH(doeval(gimme, NULL, NULL, PL_curcop->cop_seq));
 
     /* Restore encoding. */
     PL_encoding = encoding;
@@ -3429,6 +3432,10 @@ PP(pp_entereval)
     CV* runcv;
     U32 seq;
     HV *saved_hh = NULL;
+    const char * const fakestr = "_<(eval )";
+#ifdef HAS_STRLCPY
+    const int fakelen = 9 + 1;
+#endif
     
     if (PL_op->op_private & OPpEVAL_HAS_HH) {
        saved_hh = (HV*) SvREFCNT_inc(POPs);
@@ -3446,15 +3453,19 @@ PP(pp_entereval)
     /* switch to eval mode */
 
     if (PERLDB_NAMEEVAL && CopLINE(PL_curcop)) {
-       SV * const sv = sv_newmortal();
-       Perl_sv_setpvf(aTHX_ sv, "_<(eval %lu)[%s:%"IVdf"]",
+       SV * const temp_sv = sv_newmortal();
+       Perl_sv_setpvf(aTHX_ temp_sv, "_<(eval %lu)[%s:%"IVdf"]",
                       (unsigned long)++PL_evalseq,
                       CopFILE(PL_curcop), (IV)CopLINE(PL_curcop));
-       tmpbuf = SvPVX(sv);
-       len = SvCUR(sv);
+       tmpbuf = SvPVX(temp_sv);
+       len = SvCUR(temp_sv);
     }
     else
+#ifdef USE_SNPRINTF
+       len = snprintf(tmpbuf, sizeof(tbuf), "_<(eval %lu)", (unsigned long)++PL_evalseq);
+#else
        len = my_sprintf(tmpbuf, "_<(eval %lu)", (unsigned long)++PL_evalseq);
+#endif /* ifdef USE_SNPRINTF */
     SAVECOPFILE_FREE(&PL_compiling);
     CopFILE_set(&PL_compiling, tmpbuf+2);
     SAVECOPLINE(&PL_compiling);
@@ -3470,13 +3481,8 @@ PP(pp_entereval)
     PL_hints = PL_op->op_targ;
     if (saved_hh)
        GvHV(PL_hintgv) = saved_hh;
-    SAVESPTR(PL_compiling.cop_warnings);
-    if (specialWARN(PL_curcop->cop_warnings))
-        PL_compiling.cop_warnings = PL_curcop->cop_warnings;
-    else {
-        PL_compiling.cop_warnings = newSVsv(PL_curcop->cop_warnings);
-        SAVEFREESV(PL_compiling.cop_warnings);
-    }
+    SAVECOMPILEWARNINGS();
+    PL_compiling.cop_warnings = DUP_WARNINGS(PL_curcop->cop_warnings);
     SAVESPTR(PL_compiling.cop_io);
     if (specialCopIO(PL_curcop->cop_io))
         PL_compiling.cop_io = PL_curcop->cop_io;
@@ -3484,6 +3490,15 @@ PP(pp_entereval)
         PL_compiling.cop_io = newSVsv(PL_curcop->cop_io);
         SAVEFREESV(PL_compiling.cop_io);
     }
+    if (PL_compiling.cop_hints) {
+       Perl_refcounted_he_free(aTHX_ PL_compiling.cop_hints);
+    }
+    PL_compiling.cop_hints = PL_curcop->cop_hints;
+    if (PL_compiling.cop_hints) {
+       HINTS_REFCNT_LOCK;
+       PL_compiling.cop_hints->refcounted_he_refcnt++;
+       HINTS_REFCNT_UNLOCK;
+    }
     /* special case: an eval '' executed within the DB package gets lexically
      * placed in the first non-DB CV rather than the current CV - this
      * allows the debugger to execute code, find lexicals etc, in the
@@ -3492,7 +3507,7 @@ PP(pp_entereval)
     runcv = find_runcv(&seq);
 
     PUSHBLOCK(cx, (CXt_EVAL|CXp_REAL), SP);
-    PUSHEVAL(cx, 0, Nullgv);
+    PUSHEVAL(cx, 0, NULL);
     cx->blk_eval.retop = PL_op->op_next;
 
     /* prepare to compile string */
@@ -3503,7 +3518,12 @@ PP(pp_entereval)
     ret = doeval(gimme, NULL, runcv, seq);
     if (PERLDB_INTER && was != (I32)PL_sub_generation /* Some subs defined here. */
        && ret != PL_op->op_next) {     /* Successive compilation. */
-       strcpy(safestr, "_<(eval )");   /* Anything fake and short. */
+       /* Copy in anything fake and short. */
+#ifdef HAS_STRLCPY
+       strlcpy(safestr, fakestr, fakelen);
+#else
+       strcpy(safestr, fakestr);
+#endif /* #ifdef HAS_STRLCPY */
     }
     return DOCATCH(ret);
 }
@@ -3564,7 +3584,7 @@ PP(pp_leaveeval)
        /* Unassume the success we assumed earlier. */
        SV * const nsv = cx->blk_eval.old_namesv;
        (void)hv_delete(GvHVn(PL_incgv), SvPVX_const(nsv), SvCUR(nsv), G_DISCARD);
-       retop = Perl_die(aTHX_ "%"SVf" did not return a true value", nsv);
+       retop = Perl_die(aTHX_ "%"SVf" did not return a true value", (void*)nsv);
        /* die_where() did LEAVE, or we won't be here */
     }
     else {
@@ -3576,22 +3596,57 @@ PP(pp_leaveeval)
     RETURNOP(retop);
 }
 
-PP(pp_entertry)
+/* Common code for Perl_call_sv and Perl_fold_constants, put here to keep it
+   close to the related Perl_create_eval_scope.  */
+void
+Perl_delete_eval_scope(pTHX)
 {
-    dVAR; dSP;
+    SV **newsp;
+    PMOP *newpm;
+    I32 gimme;
     register PERL_CONTEXT *cx;
-    const I32 gimme = GIMME_V;
+    I32 optype;
+       
+    POPBLOCK(cx,newpm);
+    POPEVAL(cx);
+    PL_curpm = newpm;
+    LEAVE;
+    PERL_UNUSED_VAR(newsp);
+    PERL_UNUSED_VAR(gimme);
+    PERL_UNUSED_VAR(optype);
+}
 
+/* Common-ish code salvaged from Perl_call_sv and pp_entertry, because it was
+   also needed by Perl_fold_constants.  */
+PERL_CONTEXT *
+Perl_create_eval_scope(pTHX_ U32 flags)
+{
+    PERL_CONTEXT *cx;
+    const I32 gimme = GIMME_V;
+       
     ENTER;
     SAVETMPS;
 
-    PUSHBLOCK(cx, (CXt_EVAL|CXp_TRYBLOCK), SP);
+    PUSHBLOCK(cx, (CXt_EVAL|CXp_TRYBLOCK), PL_stack_sp);
     PUSHEVAL(cx, 0, 0);
-    cx->blk_eval.retop = cLOGOP->op_other->op_next;
+    PL_eval_root = PL_op;      /* Only needed so that goto works right. */
 
     PL_in_eval = EVAL_INEVAL;
-    sv_setpvn(ERRSV,"",0);
-    PUTBACK;
+    if (flags & G_KEEPERR)
+       PL_in_eval |= EVAL_KEEPERR;
+    else
+       sv_setpvn(ERRSV,"",0);
+    if (flags & G_FAKINGEVAL) {
+       PL_eval_root = PL_op; /* Only needed so that goto works right. */
+    }
+    return cx;
+}
+    
+PP(pp_entertry)
+{
+    dVAR;
+    PERL_CONTEXT * const cx = create_eval_scope(0);
+    cx->blk_eval.retop = cLOGOP->op_other->op_next;
     return DOCATCH(PL_op->op_next);
 }
 
@@ -3673,11 +3728,10 @@ PP(pp_leavegiven)
     I32 gimme;
     SV **newsp;
     PMOP *newpm;
-    SV **mark;
+    PERL_UNUSED_CONTEXT;
 
     POPBLOCK(cx,newpm);
     assert(CxTYPE(cx) == CXt_GIVEN);
-    mark = newsp;
 
     SP = newsp;
     PUTBACK;
@@ -3732,7 +3786,7 @@ S_destroy_matcher(pTHX_ PMOP *matcher)
 /* Do a smart match */
 PP(pp_smartmatch)
 {
-    return do_smartmatch(Nullhv, Nullhv);
+    return do_smartmatch(NULL, NULL);
 }
 
 /* This version of do_smartmatch() implements the following
@@ -3861,7 +3915,7 @@ S_do_smartmatch(pTHX_ HV *seen_this, HV *seen_other)
        if (c == 0)
            PUSHs(&PL_sv_no);
        else if (SvTEMP(TOPs))
-           SvREFCNT_inc(TOPs);
+           SvREFCNT_inc_void(TOPs);
        FREETMPS;
        LEAVE;
        RETURN;
@@ -3973,11 +4027,11 @@ S_do_smartmatch(pTHX_ HV *seen_this, HV *seen_other)
                I32 i;
                const I32 other_len = av_len(other_av);
 
-               if (Nullhv == seen_this) {
+               if (NULL == seen_this) {
                    seen_this = newHV();
                    (void) sv_2mortal((SV *) seen_this);
                }
-               if (Nullhv == seen_other) {
+               if (NULL == seen_other) {
                    seen_this = newHV();
                    (void) sv_2mortal((SV *) seen_other);
                }
@@ -4042,7 +4096,7 @@ S_do_smartmatch(pTHX_ HV *seen_this, HV *seen_other)
                PUSHs(other);
                PUSHs(*svp);
                PUTBACK;
-               if ((PL_curcop->op_private & HINT_INTEGER) == HINT_INTEGER)
+               if (CopHINTS_get(PL_curcop) & HINT_INTEGER)
                    (void) pp_i_eq();
                else
                    (void) pp_eq();
@@ -4102,7 +4156,7 @@ S_do_smartmatch(pTHX_ HV *seen_this, HV *seen_other)
        if (c == 0)
            PUSHs(&PL_sv_undef);
        else if (SvTEMP(TOPs))
-           SvREFCNT_inc(TOPs);
+           SvREFCNT_inc_void(TOPs);
 
        if (SM_OTHER_REF(PVCV)) {
            /* This one has to be null-proto'd too.
@@ -4113,7 +4167,7 @@ S_do_smartmatch(pTHX_ HV *seen_this, HV *seen_other)
            if (c == 0)
                PUSHs(&PL_sv_undef);
            else if (SvTEMP(TOPs))
-               SvREFCNT_inc(TOPs);
+               SvREFCNT_inc_void(TOPs);
            FREETMPS;
            LEAVE;
            PUTBACK;
@@ -4136,7 +4190,7 @@ S_do_smartmatch(pTHX_ HV *seen_this, HV *seen_other)
        /* Otherwise, numeric comparison */
        PUSHs(d); PUSHs(e);
        PUTBACK;
-       if ((PL_curcop->op_private & HINT_INTEGER) == HINT_INTEGER)
+       if (CopHINTS_get(PL_curcop) & HINT_INTEGER)
            (void) pp_i_eq();
        else
            (void) pp_eq();
@@ -4502,21 +4556,75 @@ S_run_user_filter(pTHX_ int idx, SV *buf_sv, int maxlen)
     dVAR;
     SV * const datasv = FILTER_DATA(idx);
     const int filter_has_file = IoLINES(datasv);
-    GV * const filter_child_proc = (GV *)IoFMT_GV(datasv);
     SV * const filter_state = (SV *)IoTOP_GV(datasv);
     SV * const filter_sub = (SV *)IoBOTTOM_GV(datasv);
-    int len = 0;
+    int status = 0;
+    SV *upstream;
+    STRLEN got_len;
+    const char *got_p = NULL;
+    const char *prune_from = NULL;
+    bool read_from_cache = FALSE;
+    STRLEN umaxlen;
+
+    assert(maxlen >= 0);
+    umaxlen = maxlen;
 
     /* I was having segfault trouble under Linux 2.2.5 after a
        parse error occured.  (Had to hack around it with a test
        for PL_error_count == 0.)  Solaris doesn't segfault --
        not sure where the trouble is yet.  XXX */
 
+    if (IoFMT_GV(datasv)) {
+       SV *const cache = (SV *)IoFMT_GV(datasv);
+       if (SvOK(cache)) {
+           STRLEN cache_len;
+           const char *cache_p = SvPV(cache, cache_len);
+           STRLEN take = 0;
+
+           if (umaxlen) {
+               /* Running in block mode and we have some cached data already.
+                */
+               if (cache_len >= umaxlen) {
+                   /* In fact, so much data we don't even need to call
+                      filter_read.  */
+                   take = umaxlen;
+               }
+           } else {
+               const char *const first_nl = memchr(cache_p, '\n', cache_len);
+               if (first_nl) {
+                   take = first_nl + 1 - cache_p;
+               }
+           }
+           if (take) {
+               sv_catpvn(buf_sv, cache_p, take);
+               sv_chop(cache, cache_p + take);
+               /* Definately not EOF  */
+               return 1;
+           }
+
+           sv_catsv(buf_sv, cache);
+           if (umaxlen) {
+               umaxlen -= cache_len;
+           }
+           SvOK_off(cache);
+           read_from_cache = TRUE;
+       }
+    }
+
+    /* Filter API says that the filter appends to the contents of the buffer.
+       Usually the buffer is "", so the details don't matter. But if it's not,
+       then clearly what it contains is already filtered by this filter, so we
+       don't want to pass it in a second time.
+       I'm going to use a mortal in case the upstream filter croaks.  */
+    upstream = ((SvOK(buf_sv) && sv_len(buf_sv)) || SvGMAGICAL(buf_sv))
+       ? sv_newmortal() : buf_sv;
+    SvUPGRADE(upstream, SVt_PV);
+       
     if (filter_has_file) {
-       len = FILTER_READ(idx+1, buf_sv, maxlen);
+       status = FILTER_READ(idx+1, upstream, 0);
     }
 
-    if (filter_sub && len >= 0) {
+    if (filter_sub && status >= 0) {
        dSP;
        int count;
 
@@ -4525,9 +4633,9 @@ S_run_user_filter(pTHX_ int idx, SV *buf_sv, int maxlen)
        SAVETMPS;
        EXTEND(SP, 2);
 
-       DEFSV = buf_sv;
+       DEFSV = upstream;
        PUSHMARK(SP);
-       PUSHs(sv_2mortal(newSViv(maxlen)));
+       PUSHs(sv_2mortal(newSViv(0)));
        if (filter_state) {
            PUSHs(filter_state);
        }
@@ -4538,7 +4646,7 @@ S_run_user_filter(pTHX_ int idx, SV *buf_sv, int maxlen)
        if (count > 0) {
            SV *out = POPs;
            if (SvOK(out)) {
-               len = SvIV(out);
+               status = SvIV(out);
            }
        }
 
@@ -4547,30 +4655,80 @@ S_run_user_filter(pTHX_ int idx, SV *buf_sv, int maxlen)
        LEAVE;
     }
 
-    if (len <= 0) {
-       IoLINES(datasv) = 0;
-       if (filter_child_proc) {
-           SvREFCNT_dec(filter_child_proc);
-           IoFMT_GV(datasv) = Nullgv;
+    if(SvOK(upstream)) {
+       got_p = SvPV(upstream, got_len);
+       if (umaxlen) {
+           if (got_len > umaxlen) {
+               prune_from = got_p + umaxlen;
+           }
+       } else {
+           const char *const first_nl = memchr(got_p, '\n', got_len);
+           if (first_nl && first_nl + 1 < got_p + got_len) {
+               /* There's a second line here... */
+               prune_from = first_nl + 1;
+           }
+       }
+    }
+    if (prune_from) {
+       /* Oh. Too long. Stuff some in our cache.  */
+       STRLEN cached_len = got_p + got_len - prune_from;
+       SV *cache = (SV *)IoFMT_GV(datasv);
+
+       if (!cache) {
+           IoFMT_GV(datasv) = (GV*) (cache = newSV(got_len - umaxlen));
+       } else if (SvOK(cache)) {
+           /* Cache should be empty.  */
+           assert(!SvCUR(cache));
        }
+
+       sv_setpvn(cache, prune_from, cached_len);
+       /* If you ask for block mode, you may well split UTF-8 characters.
+          "If it breaks, you get to keep both parts"
+          (Your code is broken if you  don't put them back together again
+          before something notices.) */
+       if (SvUTF8(upstream)) {
+           SvUTF8_on(cache);
+       }
+       SvCUR_set(upstream, got_len - cached_len);
+       /* Can't yet be EOF  */
+       if (status == 0)
+           status = 1;
+    }
+
+    /* If they are at EOF but buf_sv has something in it, then they may never
+       have touched the SV upstream, so it may be undefined.  If we naively
+       concatenate it then we get a warning about use of uninitialised value.
+    */
+    if (upstream != buf_sv && (SvOK(upstream) || SvGMAGICAL(upstream))) {
+       sv_catsv(buf_sv, upstream);
+    }
+
+    if (status <= 0) {
+       IoLINES(datasv) = 0;
+       SvREFCNT_dec(IoFMT_GV(datasv));
        if (filter_state) {
            SvREFCNT_dec(filter_state);
-           IoTOP_GV(datasv) = Nullgv;
+           IoTOP_GV(datasv) = NULL;
        }
        if (filter_sub) {
            SvREFCNT_dec(filter_sub);
-           IoBOTTOM_GV(datasv) = Nullgv;
+           IoBOTTOM_GV(datasv) = NULL;
        }
        filter_del(S_run_user_filter);
     }
-
-    return len;
+    if (status == 0 && read_from_cache) {
+       /* If we read some data from the cache (and by getting here it implies
+          that we emptied the cache) then we aren't yet at EOF, and mustn't
+          report that to our caller.  */
+       return 1;
+    }
+    return status;
 }
 
 /* perhaps someone can come up with a better name for
    this?  it is not really "absolute", per se ... */
 static bool
-S_path_is_absolute(pTHX_ const char *name)
+S_path_is_absolute(const char *name)
 {
     if (PERL_FILE_IS_ABSOLUTE(name)
 #ifdef MACOS_TRADITIONAL