assert(cv) before doing CvROOT(cv)

[perl5.git] / av.c

diff --git a/av.c b/av.c
index cb99ceb..9a5644a 100644 (file)
--- a/av.c
+++ b/av.c
@@ -87,6 +87,10 @@ Perl_av_extend_guts(pTHX_ AV *av, SSize_t key, SSize_t *maxp, SV ***allocp,
 {
     PERL_ARGS_ASSERT_AV_EXTEND_GUTS;
 
+    if (key < -1) /* -1 is legal */
+        Perl_croak(aTHX_
+            "panic: av_extend_guts() negative count (%"IVdf")", (IV)key);
+
     if (key > *maxp) {
        SV** ary;
        SSize_t tmp;
@@ -432,11 +436,15 @@ Perl_av_make(pTHX_ SSize_t size, SV **strp)
 /*
 =for apidoc av_clear
 
-Clears an array, making it empty.  Does not free the memory C<av> uses to
-store its list of scalars.  If any destructors are triggered as a result,
-C<av> itself may be freed when this function returns.
+Frees the all the elements of an array, leaving it empty.
+The XS equivalent of C<@array = ()>.  See also L</av_undef>.
 
-Perl equivalent: C<@myarray = ();>.
+Note that it is possible that the actions of a destructor called directly
+or indirectly by freeing an element of the array could cause the reference
+count of the array itself to be reduced (e.g. by deleting an entry in the
+symbol table). So it is a possibility that the AV could have been freed
+(or even reallocated) on return from the call unless you hold a reference
+to it.
 
 =cut
 */
@@ -496,9 +504,13 @@ Perl_av_clear(pTHX_ AV *av)
 /*
 =for apidoc av_undef
 
-Undefines the array.  Frees the memory used by the av to store its list of
-scalars.  If any destructors are triggered as a result, C<av> itself may
-be freed.
+Undefines the array. The XS equivalent of C<undef(@array)>.
+
+As well as freeing all the elements of the array (like C<av_clear()>), this
+also frees the memory used by the av to store its list of scalars.
+
+See L</av_clear> for a note about the array possibly being invalid on
+return.
 
 =cut
 */