X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/265f5c4a1b0b933305c553dbf2bf285c59261bc3..b9b446592491a9e83ac86f67237cd6509788def1:/gv.c

diff --git a/gv.c b/gv.c
index 357f46d..b8fef0d 100644
--- a/gv.c
+++ b/gv.c
@@ -59,6 +59,9 @@ Perl_gv_fetchfile(pTHX_ const char *name)
     STRLEN tmplen;
     GV *gv;
 
+    if (!PL_defstash)
+	return Nullgv;
+
     tmplen = strlen(name) + 2;
     if (tmplen < sizeof smallbuf)
 	tmpbuf = smallbuf;
@@ -68,15 +71,14 @@ Perl_gv_fetchfile(pTHX_ const char *name)
     tmpbuf[1] = '<';
     strcpy(tmpbuf + 2, name);
     gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
-    if (!isGV(gv))
+    if (!isGV(gv)) {
 	gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
+	sv_setpv(GvSV(gv), name);
+	if (PERLDB_LINE)
+	    hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
+    }
     if (tmpbuf != smallbuf)
 	Safefree(tmpbuf);
-    sv_setpv(GvSV(gv), name);
-    if (*name == '/' && (instr(name, "/lib/") || instr(name, ".pm")))
-	GvMULTI_on(gv);
-    if (PERLDB_LINE)
-	hv_magic(GvHVn(gv_AVadd(gv)), gv, 'L');
     return gv;
 }
 
@@ -100,8 +102,8 @@ Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
     Newz(602, gp, 1, GP);
     GvGP(gv) = gp_ref(gp);
     GvSV(gv) = NEWSV(72,0);
-    GvLINE(gv) = PL_curcop->cop_line;
-    GvFILEGV(gv) = PL_curcop->cop_filegv;
+    GvLINE(gv) = CopLINE(PL_curcop);
+    GvFILE(gv) = CopFILE(PL_curcop) ? CopFILE(PL_curcop) : "";
     GvCVGEN(gv) = 0;
     GvEGV(gv) = gv;
     sv_magic((SV*)gv, (SV*)gv, '*', name, len);
@@ -120,7 +122,7 @@ Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
 
 	PL_sub_generation++;
 	CvGV(GvCV(gv)) = (GV*)SvREFCNT_inc(gv);
-	CvFILEGV(GvCV(gv)) = PL_curcop->cop_filegv;
+	CvFILE(GvCV(gv)) = CopFILE(PL_curcop);
 	CvSTASH(GvCV(gv)) = PL_curstash;
 #ifdef USE_THREADS
 	CvOWNER(GvCV(gv)) = 0;
@@ -152,6 +154,27 @@ S_gv_init_sv(pTHX_ GV *gv, I32 sv_type)
     }
 }
 
+/*
+=for apidoc gv_fetchmeth
+
+Returns the glob with the given C<name> and a defined subroutine or
+C<NULL>.  The glob lives in the given C<stash>, or in the stashes
+accessible via @ISA and @UNIVERSAL. 
+
+The argument C<level> should be either 0 or -1.  If C<level==0>, as a
+side-effect creates a glob with the given C<name> in the given C<stash>
+which in the case of success contains an alias for the subroutine, and sets
+up caching info for this glob.  Similarly for all the searched stashes. 
+
+This function grants C<"SUPER"> token as a postfix of the stash name. The
+GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
+visible to Perl code.  So when calling C<perl_call_sv>, you should not use
+the GV directly; instead, you should use the method's CV, which can be
+obtained from the GV with the C<GvCV> macro. 
+
+=cut
+*/
+
 GV *
 Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
 {
@@ -273,12 +296,48 @@ Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
     return 0;
 }
 
+/*
+=for apidoc gv_fetchmethod
+
+See L<gv_fetchmethod_autoload.
+
+=cut
+*/
+
 GV *
 Perl_gv_fetchmethod(pTHX_ HV *stash, const char *name)
 {
     return gv_fetchmethod_autoload(stash, name, TRUE);
 }
 
+/*
+=for apidoc gv_fetchmethod_autoload
+
+Returns the glob which contains the subroutine to call to invoke the method
+on the C<stash>.  In fact in the presence of autoloading this may be the
+glob for "AUTOLOAD".  In this case the corresponding variable $AUTOLOAD is
+already setup. 
+
+The third parameter of C<gv_fetchmethod_autoload> determines whether
+AUTOLOAD lookup is performed if the given method is not present: non-zero
+means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD. 
+Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
+with a non-zero C<autoload> parameter. 
+
+These functions grant C<"SUPER"> token as a prefix of the method name. Note
+that if you want to keep the returned glob for a long time, you need to
+check for it being "AUTOLOAD", since at the later time the call may load a
+different subroutine due to $AUTOLOAD changing its value. Use the glob
+created via a side effect to do this. 
+
+These functions have the same side-effects and as C<gv_fetchmeth> with
+C<level==0>.  C<name> should be writable if contains C<':'> or C<'
+''>. The warning against passing the GV returned by C<gv_fetchmeth> to
+C<perl_call_sv> apply equally to these functions. 
+
+=cut
+*/
+
 GV *
 Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
 {
@@ -301,7 +360,7 @@ Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
 	if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) {
 	    /* ->SUPER::method should really be looked up in original stash */
 	    SV *tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
-					     HvNAME(PL_curcop->cop_stash)));
+						  CopSTASHPV(PL_curcop)));
 	    stash = gv_stashpvn(SvPVX(tmpstr), SvCUR(tmpstr), TRUE);
 	    DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
 			 origname, HvNAME(stash), name) );
@@ -385,6 +444,17 @@ Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
     return gv;
 }
 
+/*
+=for apidoc gv_stashpv
+
+Returns a pointer to the stash for a specified package.  If C<create> is
+set then the package will be created if it does not already exist.  If
+C<create> is not set and the package does not exist then NULL is
+returned.
+
+=cut
+*/
+
 HV*
 Perl_gv_stashpv(pTHX_ const char *name, I32 create)
 {
@@ -420,6 +490,15 @@ Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 create)
     return stash;
 }
 
+/*
+=for apidoc gv_stashsv
+
+Returns a pointer to the stash for a specified package.  See
+C<gv_stashpv>.
+
+=cut
+*/
+
 HV*
 Perl_gv_stashsv(pTHX_ SV *sv, I32 create)
 {
@@ -446,8 +525,8 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
 	name++;
 
     for (namend = name; *namend; namend++) {
-	if ((*namend == '\'' && namend[1]) ||
-	    (*namend == ':' && namend[1] == ':'))
+	if ((*namend == ':' && namend[1] == ':')
+	    || (*namend == '\'' && namend[1]))
 	{
 	    if (!stash)
 		stash = PL_defstash;
@@ -502,9 +581,7 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
     /* No stash in name, so see how we can default */
 
     if (!stash) {
-	if (isIDFIRST(*name)
-	    || (IN_UTF8 && ((*name & 0xc0) == 0xc0) && isIDFIRST_utf8((U8*)name)))
-	{
+	if (isIDFIRST_lazy(name)) {
 	    bool global = FALSE;
 
 	    if (isUPPER(*name)) {
@@ -559,7 +636,7 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
 		}
 	    }
 	    else
-		stash = PL_curcop->cop_stash;
+		stash = CopSTASH(PL_curcop);
 	}
 	else
 	    stash = PL_defstash;
@@ -568,26 +645,15 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
     /* By this point we should have a stash and a name */
 
     if (!stash) {
-	if (!add)
-	    return Nullgv;
-	{
-	    char sv_type_char = ((sv_type == SVt_PV) ? '$'
-				 : (sv_type == SVt_PVAV) ? '@'
-				 : (sv_type == SVt_PVHV) ? '%'
-				 : 0);
-	    if (sv_type_char) 
-		Perl_warn(aTHX_ "Global symbol \"%c%s\" requires explicit package name",
-		     sv_type_char, name);
-	    else
-		Perl_warn(aTHX_ "Global symbol \"%s\" requires explicit package name",
-		     name);
+	if (add) {
+	    qerror(Perl_mess(aTHX_
+		 "Global symbol \"%s%s\" requires explicit package name",
+		 (sv_type == SVt_PV ? "$"
+		  : sv_type == SVt_PVAV ? "@"
+		  : sv_type == SVt_PVHV ? "%"
+		  : ""), name));
 	}
-	++PL_error_count;
-	stash = PL_curstash ? PL_curstash : PL_defstash;	/* avoid core dumps */
-	add_gvflags = ((sv_type == SVt_PV) ? GVf_IMPORTED_SV
-		       : (sv_type == SVt_PVAV) ? GVf_IMPORTED_AV
-		       : (sv_type == SVt_PVHV) ? GVf_IMPORTED_HV
-		       : 0);
+	return Nullgv;
     }
 
     if (!SvREFCNT(stash))	/* symbol table under destruction */
@@ -663,39 +729,44 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
 	if (strEQ(name, "SIG")) {
 	    HV *hv;
 	    I32 i;
-	    PL_siggv = gv;
-	    GvMULTI_on(PL_siggv);
-	    hv = GvHVn(PL_siggv);
-	    hv_magic(hv, PL_siggv, 'S');
-	    for(i=1;PL_sig_name[i];i++) {
+	    if (!PL_psig_ptr) {
+		int sig_num[] = { SIG_NUM };
+		New(73, PL_psig_ptr, sizeof(sig_num)/sizeof(*sig_num), SV*);
+		New(73, PL_psig_name, sizeof(sig_num)/sizeof(*sig_num), SV*);
+	    }
+	    GvMULTI_on(gv);
+	    hv = GvHVn(gv);
+	    hv_magic(hv, gv, 'S');
+	    for (i = 1; PL_sig_name[i]; i++) {
 	    	SV ** init;
-	    	init=hv_fetch(hv,PL_sig_name[i],strlen(PL_sig_name[i]),1);
-	    	if(init)
-	    		sv_setsv(*init,&PL_sv_undef);
+	    	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;
 	    	PL_psig_name[i] = 0;
 	    }
 	}
 	break;
+    case 'V':
+	if (strEQ(name, "VERSION"))
+	    GvMULTI_on(gv);
+	break;
 
     case '&':
 	if (len > 1)
 	    break;
-	PL_ampergv = gv;
 	PL_sawampersand = TRUE;
 	goto ro_magicalize;
 
     case '`':
 	if (len > 1)
 	    break;
-	PL_leftgv = gv;
 	PL_sawampersand = TRUE;
 	goto ro_magicalize;
 
     case '\'':
 	if (len > 1)
 	    break;
-	PL_rightgv = gv;
 	PL_sawampersand = TRUE;
 	goto ro_magicalize;
 
@@ -756,25 +827,28 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
     case '\\':
     case '/':
     case '|':
-    case '\001':
-    case '\002':
-    case '\003':
-    case '\004':
-    case '\005':
-    case '\006':
-    case '\010':
-    case '\011':	/* NOT \t in EBCDIC */
-    case '\017':
-    case '\020':
-    case '\024':
-    case '\027':
+    case '\001':	/* $^A */
+    case '\003':	/* $^C */
+    case '\004':	/* $^D */
+    case '\005':	/* $^E */
+    case '\006':	/* $^F */
+    case '\010':	/* $^H */
+    case '\011':	/* $^I, NOT \t in EBCDIC */
+    case '\017':	/* $^O */
+    case '\020':	/* $^P */
+    case '\024':	/* $^T */
+    case '\025':	/* $^U */
 	if (len > 1)
 	    break;
 	goto magicalize;
-    case '\023':
+    case '\023':	/* $^S */
 	if (len > 1)
 	    break;
 	goto ro_magicalize;
+    case '\027':	/* $^W & $^Warnings */
+	if (len > 1 && strNE(name, "\027arnings"))
+	    break;
+	goto magicalize;
 
     case '+':
 	if (len > 1)
@@ -799,7 +873,7 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
 	sv_magic(GvSV(gv), (SV*)gv, 0, name, len);
 	break;
 
-    case '\014':
+    case '\014':	/* $^L */
 	if (len > 1)
 	    break;
 	sv_setpv(GvSV(gv),"\f");
@@ -814,11 +888,19 @@ Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type)
 	if (len == 1) {
 	    SV *sv = GvSV(gv);
 	    (void)SvUPGRADE(sv, SVt_PVNV);
-	    sv_setpv(sv, PL_patchlevel);
-	    (void)sv_2nv(sv);
+	    SvNVX(sv) = SvNVX(PL_patchlevel);
+	    SvNOK_on(sv);
+	    (void)SvPV_nolen(sv);
 	    SvREADONLY_on(sv);
 	}
 	break;
+    case '\026':	/* $^V */
+	if (len == 1) {
+	    SV *sv = GvSV(gv);
+	    GvSV(gv) = SvREFCNT_inc(PL_patchlevel);
+	    SvREFCNT_dec(sv);
+	}
+	break;
     }
     return gv;
 }
@@ -887,7 +969,6 @@ Perl_gv_check(pTHX_ HV *stash)
     register I32 i;
     register GV *gv;
     HV *hv;
-    GV *filegv;
 
     if (!HvARRAY(stash))
 	return;
@@ -900,14 +981,25 @@ Perl_gv_check(pTHX_ HV *stash)
 		     gv_check(hv);              /* nested package */
 	    }
 	    else if (isALPHA(*HeKEY(entry))) {
+		char *file;
 		gv = (GV*)HeVAL(entry);
 		if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
 		    continue;
-		PL_curcop->cop_line = GvLINE(gv);
-		filegv = GvFILEGV(gv);
-		PL_curcop->cop_filegv = filegv;
-		if (filegv && GvMULTI(filegv))	/* Filename began with slash */
+		file = GvFILE(gv);
+		/* performance hack: if filename is absolute and it's a standard
+		 * module, don't bother warning */
+		if (file
+		    && PERL_FILE_IS_ABSOLUTE(file)
+		    && (instr(file, "/lib/") || instr(file, ".pm")))
+		{
 		    continue;
+		}
+		CopLINE_set(PL_curcop, GvLINE(gv));
+#ifdef USE_ITHREADS
+		CopFILE(PL_curcop) = file;	/* set for warning */
+#else
+		CopFILEGV(PL_curcop) = gv_fetchfile(file);
+#endif
 		Perl_warner(aTHX_ WARN_ONCE,
 			"Name \"%s::%s\" used only once: possible typo",
 			HvNAME(stash), GvNAME(gv));
@@ -928,6 +1020,8 @@ Perl_newGVgen(pTHX_ char *pack)
 GP*
 Perl_gp_ref(pTHX_ GP *gp)
 {
+    if (!gp)
+	return (GP*)NULL;
     gp->gp_refcnt++;
     if (gp->gp_cv) {
 	if (gp->gp_cvgen) {
@@ -1354,7 +1448,7 @@ Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
 	if (amtp && amtp->fallback >= AMGfallYES) {
 	  DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX(msg)) );
 	} else {
-	  Perl_croak(aTHX_ "%_", msg);
+	  Perl_croak(aTHX_ "%"SVf, msg);
 	}
 	return NULL;
       }