X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=av.c;h=f45a3ea63f439184da2395ce791d94b7aa765a9e;hb=334b0924e9cb80a0a1a60e44bb69faef523ef01c;hp=67ffad9f422517a5b4273f6dd66bbf981afa4d78;hpb=b63c7c552a2e9cf2b2c5eb492358b8567fd16179;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/av.c b/av.c
index 67ffad9..f45a3ea 100644
--- a/av.c
+++ b/av.c
@@ -1,7 +1,7 @@
 /*    av.c
  *
- *    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- *    2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, by Larry Wall and others
+ *    Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
+ *    2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -9,8 +9,10 @@
  */
 
 /*
- * "...for the Entwives desired order, and plenty, and peace (by which they
- * meant that things should remain where they had set them)." --Treebeard
+ * '...for the Entwives desired order, and plenty, and peace (by which they
+ *  meant that things should remain where they had set them).' --Treebeard
+ *
+ *     [p.476 of _The Lord of the Rings_, III/iv: "Treebeard"]
  */
 
 /*
@@ -33,7 +35,7 @@ Perl_av_reify(pTHX_ AV *av)
     if (AvREAL(av))
 	return;
 #ifdef DEBUGGING
-    if (SvTIED_mg((SV*)av, PERL_MAGIC_tied) && ckWARN_d(WARN_DEBUGGING))
+    if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied) && ckWARN_d(WARN_DEBUGGING))
 	Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "av_reify called on tied array");
 #endif
     key = AvMAX(av) + 1;
@@ -70,7 +72,7 @@ Perl_av_extend(pTHX_ AV *av, I32 key)
     PERL_ARGS_ASSERT_AV_EXTEND;
     assert(SvTYPE(av) == SVt_PVAV);
 
-    mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied);
+    mg = SvTIED_mg((const SV *)av, PERL_MAGIC_tied);
     if (mg) {
 	dSP;
 	ENTER;
@@ -78,7 +80,7 @@ Perl_av_extend(pTHX_ AV *av, I32 key)
 	PUSHSTACKi(PERLSI_MAGIC);
 	PUSHMARK(SP);
 	EXTEND(SP,2);
-	PUSHs(SvTIED_obj((SV*)av, mg));
+	PUSHs(SvTIED_obj(MUTABLE_SV(av), mg));
 	mPUSHi(key + 1);
         PUTBACK;
 	call_method("EXTEND", G_SCALAR|G_DISCARD);
@@ -134,7 +136,7 @@ Perl_av_extend(pTHX_ AV *av, I32 key)
 		   the current lazy system of only writing to it if our caller
 		   has a need for more space. NWC  */
 		newmax = Perl_safesysmalloc_size((void*)AvALLOC(av)) /
-		    sizeof(SV*) - 1;
+		    sizeof(const SV *) - 1;
 
 		if (key <= newmax) 
 		    goto resized;
@@ -145,20 +147,21 @@ Perl_av_extend(pTHX_ AV *av, I32 key)
 #if defined(STRANGE_MALLOC) || defined(MYMALLOC)
 		Renew(AvALLOC(av),newmax+1, SV*);
 #else
-		bytes = (newmax + 1) * sizeof(SV*);
+		bytes = (newmax + 1) * sizeof(const SV *);
 #define MALLOC_OVERHEAD 16
 		itmp = MALLOC_OVERHEAD;
 		while ((MEM_SIZE)(itmp - MALLOC_OVERHEAD) < bytes)
 		    itmp += itmp;
 		itmp -= MALLOC_OVERHEAD;
-		itmp /= sizeof(SV*);
+		itmp /= sizeof(const SV *);
 		assert(itmp > newmax);
 		newmax = itmp - 1;
 		assert(newmax >= AvMAX(av));
 		Newx(ary, newmax+1, SV*);
 		Copy(AvALLOC(av), ary, AvMAX(av)+1, SV*);
 		if (AvMAX(av) > 64)
-		    offer_nice_chunk(AvALLOC(av), (AvMAX(av)+1) * sizeof(SV*));
+		    offer_nice_chunk(AvALLOC(av),
+				     (AvMAX(av)+1) * sizeof(const SV *));
 		else
 		    Safefree(AvALLOC(av));
 		AvALLOC(av) = ary;
@@ -215,15 +218,17 @@ Perl_av_fetch(pTHX_ register AV *av, I32 key, I32 lval)
     assert(SvTYPE(av) == SVt_PVAV);
 
     if (SvRMAGICAL(av)) {
-        const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied);
-        if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) {
+        const MAGIC * const tied_magic
+	    = mg_find((const SV *)av, PERL_MAGIC_tied);
+        if (tied_magic || mg_find((const SV *)av, PERL_MAGIC_regdata)) {
 	    SV *sv;
 	    if (key < 0) {
 		I32 adjust_index = 1;
 		if (tied_magic) {
 		    /* Handle negative array indices 20020222 MJD */
 		    SV * const * const negative_indices_glob =
-			hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, tied_magic))),
+			hv_fetch(SvSTASH(SvRV(SvTIED_obj(MUTABLE_SV(av),
+							 tied_magic))),
 				NEGATIVE_INDICES_VAR, 16, 0);
 
 		    if (negative_indices_glob && SvTRUE(GvSV(*negative_indices_glob)))
@@ -239,7 +244,7 @@ Perl_av_fetch(pTHX_ register AV *av, I32 key, I32 lval)
 
             sv = sv_newmortal();
 	    sv_upgrade(sv, SVt_PVLV);
-	    mg_copy((SV*)av, sv, 0, key);
+	    mg_copy(MUTABLE_SV(av), sv, 0, key);
 	    LvTYPE(sv) = 't';
 	    LvTARG(sv) = sv; /* fake (SV**) */
 	    return &(LvTARG(sv));
@@ -306,13 +311,13 @@ Perl_av_store(pTHX_ register AV *av, I32 key, SV *val)
 	val = &PL_sv_undef;
 
     if (SvRMAGICAL(av)) {
-        const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied);
+        const MAGIC * const tied_magic = mg_find((const SV *)av, PERL_MAGIC_tied);
         if (tied_magic) {
             /* Handle negative array indices 20020222 MJD */
             if (key < 0) {
 		bool adjust_index = 1;
 		SV * const * const negative_indices_glob =
-                    hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, 
+                    hv_fetch(SvSTASH(SvRV(SvTIED_obj(MUTABLE_SV(av), 
                                                      tied_magic))), 
                              NEGATIVE_INDICES_VAR, 16, 0);
                 if (negative_indices_glob
@@ -325,7 +330,7 @@ Perl_av_store(pTHX_ register AV *av, I32 key, SV *val)
                 }
             }
 	    if (val != &PL_sv_undef) {
-		mg_copy((SV*)av, val, 0, key);
+		mg_copy(MUTABLE_SV(av), val, 0, key);
 	    }
 	    return NULL;
         }
@@ -339,7 +344,7 @@ Perl_av_store(pTHX_ register AV *av, I32 key, SV *val)
     }
 
     if (SvREADONLY(av) && key >= AvFILL(av))
-	Perl_croak(aTHX_ PL_no_modify);
+	Perl_croak(aTHX_ "%s", PL_no_modify);
 
     if (!AvREAL(av) && AvREIFY(av))
 	av_reify(av);
@@ -362,12 +367,12 @@ Perl_av_store(pTHX_ register AV *av, I32 key, SV *val)
     if (SvSMAGICAL(av)) {
 	const MAGIC* const mg = SvMAGIC(av);
 	if (val != &PL_sv_undef) {
-	    sv_magic(val, (SV*)av, toLOWER(mg->mg_type), 0, key);
+	    sv_magic(val, MUTABLE_SV(av), toLOWER(mg->mg_type), 0, key);
 	}
 	if (PL_delaymagic && mg->mg_type == PERL_MAGIC_isa)
 	    PL_delaymagic |= DM_ARRAY;
 	else
-	   mg_set((SV*)av);
+	   mg_set(MUTABLE_SV(av));
     }
     return &ary[key];
 }
@@ -385,7 +390,7 @@ will have a reference count of 1.
 AV *
 Perl_av_make(pTHX_ register I32 size, register SV **strp)
 {
-    register AV * const av = (AV*)newSV_type(SVt_PVAV);
+    register AV * const av = MUTABLE_AV(newSV_type(SVt_PVAV));
     /* sv_upgrade does AvREAL_only()  */
     PERL_ARGS_ASSERT_AV_MAKE;
     assert(SvTYPE(av) == SVt_PVAV);
@@ -432,7 +437,7 @@ Perl_av_clear(pTHX_ register AV *av)
 #endif
 
     if (SvREADONLY(av))
-	Perl_croak(aTHX_ PL_no_modify);
+	Perl_croak(aTHX_ "%s", PL_no_modify);
 
     /* Give any tie a chance to cleanup first */
     if (SvRMAGICAL(av)) {
@@ -440,7 +445,7 @@ Perl_av_clear(pTHX_ register AV *av)
 	if (PL_delaymagic && mg && mg->mg_type == PERL_MAGIC_isa)
 	    PL_delaymagic |= DM_ARRAY;
         else
-	    mg_clear((SV*)av); 
+	    mg_clear(MUTABLE_SV(av)); 
     }
 
     if (AvMAX(av) < 0)
@@ -481,7 +486,7 @@ Perl_av_undef(pTHX_ register AV *av)
     assert(SvTYPE(av) == SVt_PVAV);
 
     /* Give any tie a chance to cleanup first */
-    if (SvTIED_mg((SV*)av, PERL_MAGIC_tied)) 
+    if (SvTIED_mg((const SV *)av, PERL_MAGIC_tied)) 
 	av_fill(av, -1);
 
     if (AvREAL(av)) {
@@ -495,7 +500,7 @@ Perl_av_undef(pTHX_ register AV *av)
     AvARRAY(av) = NULL;
     AvMAX(av) = AvFILLp(av) = -1;
 
-    if(SvRMAGICAL(av)) mg_clear((SV*)av);
+    if(SvRMAGICAL(av)) mg_clear(MUTABLE_SV(av));
 }
 
 /*
@@ -522,7 +527,8 @@ Perl_av_create_and_push(pTHX_ AV **const avp, SV *const val)
 =for apidoc av_push
 
 Pushes an SV onto the end of the array.  The array will grow automatically
-to accommodate the addition.
+to accommodate the addition. Like C<av_store>, this takes ownership of one
+reference count.
 
 =cut
 */
@@ -537,14 +543,14 @@ Perl_av_push(pTHX_ register AV *av, SV *val)
     assert(SvTYPE(av) == SVt_PVAV);
 
     if (SvREADONLY(av))
-	Perl_croak(aTHX_ PL_no_modify);
+	Perl_croak(aTHX_ "%s", PL_no_modify);
 
-    if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) {
+    if ((mg = SvTIED_mg((const SV *)av, PERL_MAGIC_tied))) {
 	dSP;
 	PUSHSTACKi(PERLSI_MAGIC);
 	PUSHMARK(SP);
 	EXTEND(SP,2);
-	PUSHs(SvTIED_obj((SV*)av, mg));
+	PUSHs(SvTIED_obj(MUTABLE_SV(av), mg));
 	PUSHs(val);
 	PUTBACK;
 	ENTER;
@@ -576,12 +582,12 @@ Perl_av_pop(pTHX_ register AV *av)
     assert(SvTYPE(av) == SVt_PVAV);
 
     if (SvREADONLY(av))
-	Perl_croak(aTHX_ PL_no_modify);
-    if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) {
+	Perl_croak(aTHX_ "%s", PL_no_modify);
+    if ((mg = SvTIED_mg((const SV *)av, PERL_MAGIC_tied))) {
 	dSP;    
 	PUSHSTACKi(PERLSI_MAGIC);
 	PUSHMARK(SP);
-	XPUSHs(SvTIED_obj((SV*)av, mg));
+	XPUSHs(SvTIED_obj(MUTABLE_SV(av), mg));
 	PUTBACK;
 	ENTER;
 	if (call_method("POP", G_SCALAR)) {
@@ -598,7 +604,7 @@ Perl_av_pop(pTHX_ register AV *av)
     retval = AvARRAY(av)[AvFILLp(av)];
     AvARRAY(av)[AvFILLp(av)--] = &PL_sv_undef;
     if (SvSMAGICAL(av))
-	mg_set((SV*)av);
+	mg_set(MUTABLE_SV(av));
     return retval;
 }
 
@@ -645,14 +651,14 @@ Perl_av_unshift(pTHX_ register AV *av, register I32 num)
     assert(SvTYPE(av) == SVt_PVAV);
 
     if (SvREADONLY(av))
-	Perl_croak(aTHX_ PL_no_modify);
+	Perl_croak(aTHX_ "%s", PL_no_modify);
 
-    if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) {
+    if ((mg = SvTIED_mg((const SV *)av, PERL_MAGIC_tied))) {
 	dSP;
 	PUSHSTACKi(PERLSI_MAGIC);
 	PUSHMARK(SP);
 	EXTEND(SP,1+num);
-	PUSHs(SvTIED_obj((SV*)av, mg));
+	PUSHs(SvTIED_obj(MUTABLE_SV(av), mg));
 	while (num-- > 0) {
 	    PUSHs(&PL_sv_undef);
 	}
@@ -701,7 +707,8 @@ Perl_av_unshift(pTHX_ register AV *av, register I32 num)
 /*
 =for apidoc av_shift
 
-Shifts an SV off the beginning of the array.
+Shifts an SV off the beginning of the array. Returns C<&PL_sv_undef> if the 
+array is empty.
 
 =cut
 */
@@ -717,12 +724,12 @@ Perl_av_shift(pTHX_ register AV *av)
     assert(SvTYPE(av) == SVt_PVAV);
 
     if (SvREADONLY(av))
-	Perl_croak(aTHX_ PL_no_modify);
-    if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) {
+	Perl_croak(aTHX_ "%s", PL_no_modify);
+    if ((mg = SvTIED_mg((const SV *)av, PERL_MAGIC_tied))) {
 	dSP;
 	PUSHSTACKi(PERLSI_MAGIC);
 	PUSHMARK(SP);
-	XPUSHs(SvTIED_obj((SV*)av, mg));
+	XPUSHs(SvTIED_obj(MUTABLE_SV(av), mg));
 	PUTBACK;
 	ENTER;
 	if (call_method("SHIFT", G_SCALAR)) {
@@ -743,7 +750,7 @@ Perl_av_shift(pTHX_ register AV *av)
     AvMAX(av)--;
     AvFILLp(av)--;
     if (SvSMAGICAL(av))
-	mg_set((SV*)av);
+	mg_set(MUTABLE_SV(av));
     return retval;
 }
 
@@ -757,7 +764,7 @@ array is C<av_len(av) + 1>.  Returns -1 if the array is empty.
 */
 
 I32
-Perl_av_len(pTHX_ register const AV *av)
+Perl_av_len(pTHX_ AV *av)
 {
     PERL_ARGS_ASSERT_AV_LEN;
     assert(SvTYPE(av) == SVt_PVAV);
@@ -790,14 +797,14 @@ Perl_av_fill(pTHX_ register AV *av, I32 fill)
 
     if (fill < 0)
 	fill = -1;
-    if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) {
+    if ((mg = SvTIED_mg((const SV *)av, PERL_MAGIC_tied))) {
 	dSP;            
 	ENTER;
 	SAVETMPS;
 	PUSHSTACKi(PERLSI_MAGIC);
 	PUSHMARK(SP);
 	EXTEND(SP,2);
-	PUSHs(SvTIED_obj((SV*)av, mg));
+	PUSHs(SvTIED_obj(MUTABLE_SV(av), mg));
 	mPUSHi(fill + 1);
 	PUTBACK;
 	call_method("STORESIZE", G_SCALAR|G_DISCARD);
@@ -823,7 +830,7 @@ Perl_av_fill(pTHX_ register AV *av, I32 fill)
 	    
 	AvFILLp(av) = fill;
 	if (SvSMAGICAL(av))
-	    mg_set((SV*)av);
+	    mg_set(MUTABLE_SV(av));
     }
     else
 	(void)av_store(av,fill,&PL_sv_undef);
@@ -848,18 +855,19 @@ Perl_av_delete(pTHX_ AV *av, I32 key, I32 flags)
     assert(SvTYPE(av) == SVt_PVAV);
 
     if (SvREADONLY(av))
-	Perl_croak(aTHX_ PL_no_modify);
+	Perl_croak(aTHX_ "%s", PL_no_modify);
 
     if (SvRMAGICAL(av)) {
-        const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied);
-        if ((tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata))) {
+        const MAGIC * const tied_magic
+	    = mg_find((const SV *)av, PERL_MAGIC_tied);
+        if ((tied_magic || mg_find((const SV *)av, PERL_MAGIC_regdata))) {
             /* Handle negative array indices 20020222 MJD */
             SV **svp;
             if (key < 0) {
                 unsigned adjust_index = 1;
                 if (tied_magic) {
 		    SV * const * const negative_indices_glob =
-                        hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, 
+                        hv_fetch(SvSTASH(SvRV(SvTIED_obj(MUTABLE_SV(av), 
                                                          tied_magic))), 
                                  NEGATIVE_INDICES_VAR, 16, 0);
                     if (negative_indices_glob
@@ -906,7 +914,7 @@ Perl_av_delete(pTHX_ AV *av, I32 key, I32 flags)
 	else
 	    AvARRAY(av)[key] = &PL_sv_undef;
 	if (SvSMAGICAL(av))
-	    mg_set((SV*)av);
+	    mg_set(MUTABLE_SV(av));
     }
     if (flags & G_DISCARD) {
 	SvREFCNT_dec(sv);
@@ -935,8 +943,9 @@ Perl_av_exists(pTHX_ AV *av, I32 key)
     assert(SvTYPE(av) == SVt_PVAV);
 
     if (SvRMAGICAL(av)) {
-        const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied);
-        if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) {
+        const MAGIC * const tied_magic
+	    = mg_find((const SV *)av, PERL_MAGIC_tied);
+        if (tied_magic || mg_find((const SV *)av, PERL_MAGIC_regdata)) {
 	    SV * const sv = sv_newmortal();
             MAGIC *mg;
             /* Handle negative array indices 20020222 MJD */
@@ -944,7 +953,7 @@ Perl_av_exists(pTHX_ AV *av, I32 key)
                 unsigned adjust_index = 1;
                 if (tied_magic) {
 		    SV * const * const negative_indices_glob =
-                        hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, 
+                        hv_fetch(SvSTASH(SvRV(SvTIED_obj(MUTABLE_SV(av), 
                                                          tied_magic))), 
                                  NEGATIVE_INDICES_VAR, 16, 0);
                     if (negative_indices_glob
@@ -958,7 +967,7 @@ Perl_av_exists(pTHX_ AV *av, I32 key)
                 }
             }
 
-            mg_copy((SV*)av, sv, 0, key);
+            mg_copy(MUTABLE_SV(av), sv, 0, key);
             mg = mg_find(sv, PERL_MAGIC_tiedelem);
             if (mg) {
                 magic_existspack(sv, mg);
@@ -983,7 +992,7 @@ Perl_av_exists(pTHX_ AV *av, I32 key)
 	return FALSE;
 }
 
-MAGIC *
+static MAGIC *
 S_get_aux_mg(pTHX_ AV *av) {
     dVAR;
     MAGIC *mg;
@@ -991,11 +1000,11 @@ S_get_aux_mg(pTHX_ AV *av) {
     PERL_ARGS_ASSERT_GET_AUX_MG;
     assert(SvTYPE(av) == SVt_PVAV);
 
-    mg = mg_find((SV*)av, PERL_MAGIC_arylen_p);
+    mg = mg_find((const SV *)av, PERL_MAGIC_arylen_p);
 
     if (!mg) {
-	mg = sv_magicext((SV*)av, 0, PERL_MAGIC_arylen_p, &PL_vtbl_arylen_p,
-			 0, 0);
+	mg = sv_magicext(MUTABLE_SV(av), 0, PERL_MAGIC_arylen_p,
+			 &PL_vtbl_arylen_p, 0, 0);
 	assert(mg);
 	/* sv_magicext won't set this for us because we pass in a NULL obj  */
 	mg->mg_flags |= MGf_REFCOUNTED;