X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/e15faf7d09c73a41f95fbe6a0045ad5b17c899a6..324092c6237acfc7224ec0cef5bf94deb83f31bc:/gv.c

diff --git a/gv.c b/gv.c
index 7a078e8..2726840 100644
--- a/gv.c
+++ b/gv.c
@@ -37,6 +37,19 @@ Perl stores its global variables.
 static const char S_autoload[] = "AUTOLOAD";
 static const STRLEN S_autolen = sizeof(S_autoload)-1;
 
+
+#ifdef PERL_DONT_CREATE_GVSV
+GV *
+Perl_gv_SVadd(pTHX_ GV *gv)
+{
+    if (!gv || SvTYPE((SV*)gv) != SVt_PVGV)
+	Perl_croak(aTHX_ "Bad symbol for scalar");
+    if (!GvSV(gv))
+	GvSV(gv) = NEWSV(72,0);
+    return gv;
+}
+#endif
+
 GV *
 Perl_gv_AVadd(pTHX_ register GV *gv)
 {
@@ -88,15 +101,19 @@ Perl_gv_fetchfile(pTHX_ const char *name)
     if (tmplen < sizeof smallbuf)
 	tmpbuf = smallbuf;
     else
-	New(603, tmpbuf, tmplen + 1, char);
+	Newx(tmpbuf, tmplen + 1, char);
     /* This is where the debugger's %{"::_<$filename"} hash is created */
     tmpbuf[0] = '_';
     tmpbuf[1] = '<';
-    strcpy(tmpbuf + 2, name);
+    memcpy(tmpbuf + 2, name, tmplen - 1);
     gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
     if (!isGV(gv)) {
 	gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
-	sv_setpv(GvSV(gv), name);
+#ifdef PERL_DONT_CREATE_GVSV
+	GvSV(gv) = newSVpvn(name, tmplen - 2);
+#else
+	sv_setpvn(GvSV(gv), name, tmplen - 2);
+#endif
 	if (PERLDB_LINE)
 	    hv_magic(GvHVn(gv_AVadd(gv)), Nullgv, PERL_MAGIC_dbfile);
     }
@@ -122,9 +139,13 @@ Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
 	} else
 	    Safefree(SvPVX_mutable(gv));
     }
-    Newz(602, gp, 1, GP);
+    Newxz(gp, 1, GP);
     GvGP(gv) = gp_ref(gp);
+#ifdef PERL_DONT_CREATE_GVSV
+    GvSV(gv) = 0;
+#else
     GvSV(gv) = NEWSV(72,0);
+#endif
     GvLINE(gv) = CopLINE(PL_curcop);
     /* XXX Ideally this cast would be replaced with a change to const char*
        in the struct.  */
@@ -171,6 +192,14 @@ S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
     case SVt_PVHV:
 	(void)GvHVn(gv);
 	break;
+#ifdef PERL_DONT_CREATE_GVSV
+    case SVt_NULL:
+    case SVt_PVCV:
+    case SVt_PVFM:
+	break;
+    default:
+	(void)GvSVn(gv);
+#endif
     }
 }
 
@@ -427,7 +456,7 @@ Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
 	    nsplit = ++nend;
     }
     if (nsplit) {
-	const char *origname = name;
+	const char * const origname = name;
 	name = nsplit + 1;
 	if (*nsplit == ':')
 	    --nsplit;
@@ -462,7 +491,7 @@ Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
 	    gv = gv_autoload4(ostash, name, nend - name, TRUE);
     }
     else if (autoload) {
-	CV* cv = GvCV(gv);
+	CV* const cv = GvCV(gv);
 	if (!CvROOT(cv) && !CvXSUB(cv)) {
 	    GV* stubgv;
 	    GV* autogv;
@@ -518,8 +547,9 @@ Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
     /*
      * Inheriting AUTOLOAD for non-methods works ... for now.
      */
-    if (ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) && !method &&
-	(GvCVGEN(gv) || GvSTASH(gv) != stash))
+    if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
+	&& ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)
+    )
 	Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
 	  "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
 	     packname, (int)len, name);
@@ -546,10 +576,14 @@ Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
     vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
     ENTER;
 
-    if (!isGV(vargv))
+    if (!isGV(vargv)) {
 	gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
+#ifdef PERL_DONT_CREATE_GVSV
+	GvSV(vargv) = NEWSV(72,0);
+#endif
+    }
     LEAVE;
-    varsv = GvSV(vargv);
+    varsv = GvSVn(vargv);
     sv_setpvn(varsv, packname, packname_len);
     sv_catpvn(varsv, "::", 2);
     sv_catpvn(varsv, name, len);
@@ -621,7 +655,7 @@ Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
     if (namelen + 3 < sizeof smallbuf)
 	tmpbuf = smallbuf;
     else
-	New(606, tmpbuf, namelen + 3, char);
+	Newx(tmpbuf, namelen + 3, char);
     Copy(name,tmpbuf,namelen,char);
     tmpbuf[namelen++] = ':';
     tmpbuf[namelen++] = ':';
@@ -652,7 +686,7 @@ HV*
 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
 {
     STRLEN len;
-    const char *ptr = SvPV_const(sv,len);
+    const char * const ptr = SvPV_const(sv,len);
     return gv_stashpvn(ptr, len, create);
 }
 
@@ -665,7 +699,7 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) {
 GV *
 Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) {
     STRLEN len;
-    const char *nambeg = SvPV_const(name, len);
+    const char * const nambeg = SvPV_const(name, len);
     return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
 }
 
@@ -680,7 +714,8 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
     register const char *namend;
     HV *stash = 0;
     const I32 add = flags & ~SVf_UTF8;
-    (void)full_len;
+
+    PERL_UNUSED_ARG(full_len);
 
     if (*name == '*' && isALPHA(name[1])) /* accidental stringify on a GV? */
 	name++;
@@ -702,7 +737,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 		if (len + 3 < sizeof (smallbuf))
 		    tmpbuf = smallbuf;
 		else
-		    New(601, tmpbuf, len+3, char);
+		    Newx(tmpbuf, len+3, char);
 		Copy(name, tmpbuf, len, char);
 		tmpbuf[len++] = ':';
 		tmpbuf[len++] = ':';
@@ -813,7 +848,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 
     if (!stash) {
 	if (add) {
-	    register SV *err = Perl_mess(aTHX_
+	    SV * const err = Perl_mess(aTHX_
 		 "Global symbol \"%s%s\" requires explicit package name",
 		 (sv_type == SVt_PV ? "$"
 		  : sv_type == SVt_PVAV ? "@"
@@ -882,7 +917,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 		break;
 	    case 'I':
 		if (strEQ(name2, "SA")) {
-		    AV* av = GvAVn(gv);
+		    AV* const av = GvAVn(gv);
 		    GvMULTI_on(gv);
 		    sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, Nullch, 0);
 		    /* NOTE: No support for tied ISA */
@@ -905,7 +940,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 		break;
 	    case 'O':
 		if (strEQ(name2, "VERLOAD")) {
-		    HV* hv = GvHVn(gv);
+		    HV* const hv = GvHVn(gv);
 		    GvMULTI_on(gv);
 		    hv_magic(hv, Nullgv, PERL_MAGIC_overload);
 		}
@@ -915,16 +950,15 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 		    HV *hv;
 		    I32 i;
 		    if (!PL_psig_ptr) {
-			Newz(73, PL_psig_ptr,  SIG_SIZE, SV*);
-			Newz(73, PL_psig_name, SIG_SIZE, SV*);
-			Newz(73, PL_psig_pend, SIG_SIZE, int);
+			Newxz(PL_psig_ptr,  SIG_SIZE, SV*);
+			Newxz(PL_psig_name, SIG_SIZE, SV*);
+			Newxz(PL_psig_pend, SIG_SIZE, int);
 		    }
 		    GvMULTI_on(gv);
 		    hv = GvHVn(gv);
 		    hv_magic(hv, Nullgv, PERL_MAGIC_sig);
 		    for (i = 1; i < SIG_SIZE; i++) {
-			SV ** init;
-			init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
+			SV ** const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
 			if (init)
 			    sv_setsv(*init, &PL_sv_undef);
 			PL_psig_ptr[i] = 0;
@@ -1002,12 +1036,12 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 	    goto ro_magicalize;
 
 	case ':':
-	    sv_setpv(GvSV(gv),PL_chopset);
+	    sv_setpv(GvSVn(gv),PL_chopset);
 	    goto magicalize;
 
 	case '?':
 #ifdef COMPLEX_STATUS
-	    SvUPGRADE(GvSV(gv), SVt_PVLV);
+	    SvUPGRADE(GvSVn(gv), SVt_PVLV);
 #endif
 	    goto magicalize;
 
@@ -1019,7 +1053,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 	       now (rather than going to magicalize)
 	    */
 
-	    sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
+	    sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
 
 	    if (sv_type == SVt_PVHV)
 		require_errno(gv);
@@ -1027,7 +1061,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 	    break;
 	case '-':
 	{
-            AV* av = GvAVn(gv);
+	    AV* const av = GvAVn(gv);
             sv_magic((SV*)av, Nullsv, PERL_MAGIC_regdata, Nullch, 0);
 	    SvREADONLY_on(av);
 	    goto magicalize;
@@ -1039,12 +1073,12 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 			    "$%c is no longer supported", *name);
 	    break;
 	case '|':
-	    sv_setiv(GvSV(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
+	    sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
 	    goto magicalize;
 
 	case '+':
 	{
-	    AV* av = GvAVn(gv);
+	    AV* const av = GvAVn(gv);
             sv_magic((SV*)av, (SV*)av, PERL_MAGIC_regdata, Nullch, 0);
 	    SvREADONLY_on(av);
 	    /* FALL THROUGH */
@@ -1060,7 +1094,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 	case '8':
 	case '9':
 	ro_magicalize:
-	    SvREADONLY_on(GvSV(gv));
+	    SvREADONLY_on(GvSVn(gv));
 	    /* FALL THROUGH */
 	case '[':
 	case '^':
@@ -1088,19 +1122,19 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 	case '\024':	/* $^T */
 	case '\027':	/* $^W */
 	magicalize:
-	    sv_magic(GvSV(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
+	    sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len);
 	    break;
 
 	case '\014':	/* $^L */
-	    sv_setpvn(GvSV(gv),"\f",1);
-	    PL_formfeed = GvSV(gv);
+	    sv_setpvn(GvSVn(gv),"\f",1);
+	    PL_formfeed = GvSVn(gv);
 	    break;
 	case ';':
-	    sv_setpvn(GvSV(gv),"\034",1);
+	    sv_setpvn(GvSVn(gv),"\034",1);
 	    break;
 	case ']':
 	{
-	    SV *sv = GvSV(gv);
+	    SV * const sv = GvSVn(gv);
 	    if (!sv_derived_from(PL_patchlevel, "version"))
 		(void *)upg_version(PL_patchlevel);
 	    GvSV(gv) = vnumify(PL_patchlevel);
@@ -1110,7 +1144,7 @@ Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
 	break;
 	case '\026':	/* $^V */
 	{
-	    SV * const sv = GvSV(gv);
+	    SV * const sv = GvSVn(gv);
 	    GvSV(gv) = new_version(PL_patchlevel);
 	    SvREADONLY_on(GvSV(gv));
 	    SvREFCNT_dec(sv);
@@ -1157,10 +1191,8 @@ Perl_gv_fullname3(pTHX_ SV *sv, const GV *gv, const char *prefix)
 void
 Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
 {
-    const GV *egv = GvEGV(gv);
-    if (!egv)
-	egv = gv;
-    gv_fullname4(sv, egv, prefix, keepmain);
+    const GV * const egv = GvEGV(gv);
+    gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
 }
 
 void
@@ -1380,6 +1412,11 @@ Perl_Gv_AMupdate(pTHX_ HV *stash)
 
     if (!gv)
 	lim = DESTROY_amg;		/* Skip overloading entries. */
+#ifdef PERL_DONT_CREATE_GVSV
+    else if (!sv) {
+	/* Equivalent to !SvTRUE and !SvOK  */
+    }
+#endif
     else if (SvTRUE(sv))
 	amt.fallback=AMGfallYES;
     else if (SvOK(sv))
@@ -1415,17 +1452,17 @@ Perl_Gv_AMupdate(pTHX_ HV *stash)
 		   knowing *which* methods were declared as overloaded. */
 		/* GvSV contains the name of the method. */
 		GV *ngv = Nullgv;
+		SV *gvsv = GvSV(gv);
 
 		DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
 			"\" for overloaded \"%s\" in package \"%.256s\"\n",
 			     GvSV(gv), cp, hvname) );
-		if (!SvPOK(GvSV(gv))
-		    || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(GvSV(gv)),
+		if (!gvsv || !SvPOK(gvsv)
+		    || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv),
 						       FALSE)))
 		{
 		    /* Can be an import stub (created by "can"). */
-		    SV *gvsv = GvSV(gv);
-		    const char * const name = SvPOK(gvsv) ?  SvPVX_const(gvsv) : "???";
+		    const char * const name = (gvsv && SvPOK(gvsv)) ?  SvPVX_const(gvsv) : "???";
 		    Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\
 				"in package \"%.256s\"",
 			       (GvCVGEN(gv) ? "Stub found while resolving"
@@ -1489,7 +1526,7 @@ Perl_gv_handler(pTHX_ HV *stash, I32 id)
 	       "Inherited AUTOLOAD for a non-method deprecated", since
 	       our caller is going through a function call, not a method call.
 	       So return the CV for AUTOLOAD, setting $AUTOLOAD. */
-	    GV *gv = gv_fetchmethod(stash, PL_AMG_names[id]);
+	    GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
 
 	    if (gv && GvCV(gv))
 		return GvCV(gv);
@@ -1574,13 +1611,13 @@ Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
 		  * SV* ref causes confusion with the interpreter variable of
 		  * the same name
 		  */
-	     SV* tmpRef=SvRV(left);
+	     SV* const tmpRef=SvRV(left);
 	     if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
 		/*
 		 * Just to be extra cautious.  Maybe in some
 		 * additional cases sv_setsv is safe, too.
 		 */
-		SV* newref = newSVsv(tmpRef);
+		SV* const newref = newSVsv(tmpRef);
 		SvOBJECT_on(newref);
 		SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef)));
 		return newref;
@@ -1590,13 +1627,13 @@ Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
 	 case abs_amg:
 	   if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
 	       && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
-	     SV* nullsv=sv_2mortal(newSViv(0));
+	     SV* const nullsv=sv_2mortal(newSViv(0));
 	     if (off1==lt_amg) {
-	       SV* lessp = amagic_call(left,nullsv,
+	       SV* const lessp = amagic_call(left,nullsv,
 				       lt_amg,AMGf_noright);
 	       logic = SvTRUE(lessp);
 	     } else {
-	       SV* lessp = amagic_call(left,nullsv,
+	       SV* const lessp = amagic_call(left,nullsv,
 				       ncmp_amg,AMGf_noright);
 	       logic = (SvNV(lessp) < 0);
 	     }
@@ -1860,7 +1897,7 @@ bool
 Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags)
 {
     STRLEN len;
-    const char *temp = SvPV_const(name, len);
+    const char * const temp = SvPV_const(name, len);
     return is_gv_magical(temp, len, flags);
 }
 
@@ -1884,7 +1921,8 @@ pointers returned by SvPV.
 bool
 Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags)
 {
-    (void)flags;
+    PERL_UNUSED_ARG(flags);
+
     if (len > 1) {
 	const char * const name1 = name + 1;
 	switch (*name) {