X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=sv.c;h=c92c89c51f618fcdc87af30df3a8fb267c74a277;hb=5bc8ef5059e42d7960e39ba0e920933e41370b70;hp=d944e2f6fc3704bea9f4332457f58e3609f48e32;hpb=7bf7986364dc86acb86c5d83e7512b8dbdcb0165;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/sv.c b/sv.c
index d944e2f..c92c89c 100644
--- a/sv.c
+++ b/sv.c
@@ -157,7 +157,7 @@ Public API:
 
 =cut
 
-============================================================================ */
+ * ========================================================================= */
 
 /*
  * "A time to plant, and a time to uproot what was planted..."
@@ -5655,7 +5655,11 @@ Perl_sv_clear(pTHX_ register SV *const sv)
 		CV* destructor;
 		stash = SvSTASH(sv);
 		destructor = StashHANDLER(stash,DESTROY);
-		if (destructor) {
+		if (destructor
+			/* Don't bother calling an empty destructor */
+			&& (CvISXSUB(destructor)
+			|| CvSTART(destructor)->op_next->op_type != OP_LEAVESUB))
+		{
 		    SV* const tmpref = newRV(sv);
 	            SvREADONLY_on(tmpref);   /* DESTROY() could be naughty */
 		    ENTER;
@@ -5972,7 +5976,7 @@ UTF-8 bytes as a single character. Handles magic and type coercion.
 */
 
 /*
- * The length is cached in PERL_UTF8_magic, in the mg_len field.  Also the
+ * The length is cached in PERL_MAGIC_utf8, in the mg_len field.  Also the
  * mg_ptr is used, by sv_pos_u2b() and sv_pos_b2u() - see the comments below.
  * (Note that the mg_len is not the length of the mg_ptr field.
  * This allows the cache to store the character length of the string without
@@ -6201,7 +6205,7 @@ type coercion.
 
 /*
  * sv_pos_u2b() uses, like sv_pos_b2u(), the mg_ptr of the potential
- * PERL_UTF8_magic of the sv to store the mapping between UTF-8 and
+ * PERL_MAGIC_utf8 of the sv to store the mapping between UTF-8 and
  * byte offsets.  See also the comments of S_utf8_mg_pos_cache_update().
  *
  */
@@ -6444,7 +6448,7 @@ Handles magic and type coercion.
 
 /*
  * sv_pos_b2u() uses, like sv_pos_u2b(), the mg_ptr of the potential
- * PERL_UTF8_magic of the sv to store the mapping between UTF-8 and
+ * PERL_MAGIC_utf8 of the sv to store the mapping between UTF-8 and
  * byte offsets.
  *
  */
@@ -10313,7 +10317,7 @@ ptr_table_* functions.
 
 =cut
 
-============================================================================*/
+ * =========================================================================*/
 
 
 #if defined(USE_ITHREADS)