From: Vincent Pit <vince@profvince.com>
Date: Sun, 4 Jan 2009 14:13:34 +0000 (+0100)
Subject: Fix deletion of localized array elements with negative indices resulting in an incorr... 
X-Git-Tag: v0.03~2
X-Git-Url: http://git.vpit.fr/?a=commitdiff_plain;h=5327334c349244e4e8e49239528400902677075a;p=perl%2Fmodules%2FScope-Upper.git

Fix deletion of localized array elements with negative indices resulting in an incorrect restore at scope end
---

diff --git a/Upper.xs b/Upper.xs
index 657f01c..0235cbe 100644
--- a/Upper.xs
+++ b/Upper.xs
@@ -54,6 +54,10 @@
 # define PERL_MAGIC_env 'E'
 #endif
 
+#ifndef NEGATIVE_INDICES_VAR
+# define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
+#endif
+
 #define SU_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
 
 /* --- Stack manipulations ------------------------------------------------- */
@@ -71,29 +75,58 @@
 
 /* ... Saving array elements ............................................... */
 
+STATIC I32 su_av_key2idx(pTHX_ AV *av, I32 key) {
+#define su_av_key2idx(A, K) su_av_key2idx(aTHX_ (A), (K))
+ I32 idx;
+
+ if (key >= 0)
+  return key;
+
+/* Added by MJD in perl-5.8.1 with 6f12eb6d2a1dfaf441504d869b27d2e40ef4966a */
+#if SU_HAS_PERL(5, 8, 1)
+ if (SvRMAGICAL(av)) {
+  const MAGIC * const tied_magic = mg_find((SV *) av, PERL_MAGIC_tied);
+  if (tied_magic) {
+   int adjust_index = 1;
+   SV * const * const negative_indices_glob =
+                    hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *) (av), tied_magic))),
+                             NEGATIVE_INDICES_VAR, 16, 0);
+   if (negative_indices_glob && SvTRUE(GvSV(*negative_indices_glob)))
+    return key;
+  }
+ }
+#endif
+
+ idx = key + av_len(av) + 1;
+ if (idx < 0)
+  return key;
+
+ return idx;
+}
+
 #ifndef SAVEADELETE
 
 typedef struct {
  AV *av;
- I32 key;
+ I32 idx;
 } su_ud_adelete;
 
 STATIC void su_adelete(pTHX_ void *ud_) {
  su_ud_adelete *ud = ud_;
 
- av_delete(ud->av, ud->key, G_DISCARD);
+ av_delete(ud->av, ud->idx, G_DISCARD);
  SvREFCNT_dec(ud->av);
 
  Safefree(ud);
 }
 
-STATIC void su_save_adelete(pTHX_ AV *av, I32 key) {
+STATIC void su_save_adelete(pTHX_ AV *av, I32 idx) {
 #define su_save_adelete(A, K) su_save_adelete(aTHX_ (A), (K))
  su_ud_adelete *ud;
 
  Newx(ud, 1, su_ud_adelete);
  ud->av  = av;
- ud->key = key;
+ ud->idx = idx;
  SvREFCNT_inc(av);
 
  SAVEDESTRUCTOR_X(su_adelete, ud);
@@ -105,12 +138,14 @@ STATIC void su_save_adelete(pTHX_ AV *av, I32 key) {
 
 STATIC void su_save_aelem(pTHX_ AV *av, SV *key, SV *val) {
 #define su_save_aelem(A, K, V) su_save_aelem(aTHX_ (A), (K), (V))
- I32 idx = SvIV(key);
+ I32 idx;
  I32 preeminent = 1;
  SV **svp;
  HV *stash;
  MAGIC *mg;
 
+ idx = su_av_key2idx(av, SvIV(key));
+
  if (SvCANEXISTDELETE(av))
   preeminent = av_exists(av, idx);
 
diff --git a/t/48-localize_delete-magic.t b/t/48-localize_delete-magic.t
index f037b3b..0b93050 100644
--- a/t/48-localize_delete-magic.t
+++ b/t/48-localize_delete-magic.t
@@ -5,7 +5,7 @@ use warnings;
 
 use Scope::Upper qw/localize_delete/;
 
-use Test::More tests => 5;
+use Test::More tests => 9;
 
 our $deleted;
 
@@ -19,6 +19,8 @@ our $deleted;
  sub FETCHSIZE { scalar @{$_[0]} }
  sub DELETE { ++$main::deleted; delete $_[0]->[$_[1]] }
  sub EXTEND {}
+
+ our $NEGATIVE_INDICES = 0;
 }
 
 our @a;
@@ -36,3 +38,26 @@ tie @a, 'Scope::Upper::Test::TiedArray';
  is_deeply \@a, [ 5 .. 7, undef, 9 ], 'localize_elem @incomplete_tied_array, $nonexistent, 12 => 0 [end]';
  is $deleted, 1, 'localize_delete @tied_array, $existent => 0 [not more deleted]';
 }
+
+{
+ local @a = (4 .. 6);
+ local $a[4] = 7;
+ {
+  localize_delete '@main::a', -1, 0;
+  is_deeply \@a, [ 4 .. 6 ], 'localize_delete @tied_array, $existent_neg => 0 [ok]';
+ }
+ is_deeply \@a, [ 4 .. 6, undef, 7 ], 'localize_delete @tied_array, $existent_neg => 0 [end]';
+}
+
+SKIP:
+{
+ skip '$NEGATIVE_INDICES has no special meaning on 5.8.0 and older' => 2 if $] < 5.008_001;
+ local $Scope::Upper::Test::TiedArray::NEGATIVE_INDICES = 1;
+ local @a = (4 .. 6);
+ local $a[4] = 7;
+ {
+  localize_delete '@main::a', -1, 0;
+  is_deeply \@a, [ 4 .. 6 ], 'localize_delete @tied_array_wo_neg, $existent_neg => 0 [ok]';
+ }
+ is_deeply \@a, [ 4, 5, 7 ], 'localize_delete @tied_array_wo_neg, $existent_neg => 0 [end]';
+}
diff --git a/t/49-localize_delete-target.t b/t/49-localize_delete-target.t
index 6ddf79c..30468a1 100644
--- a/t/49-localize_delete-target.t
+++ b/t/49-localize_delete-target.t
@@ -3,7 +3,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 30;
+use Test::More tests => 36;
 
 use Scope::Upper qw/localize_delete/;
 
@@ -39,6 +39,34 @@ our @a;
  is_deeply \@a, [ 4 .. 6, undef, 7 ], 'localize_delete "@a", 4 (exists), 0 [end]';
 }
 
+{
+ local @a = (4 .. 6);
+ {
+  localize_delete '@main::a', -2, 0;
+  is_deeply \@a, [ 4, undef, 6 ], 'localize_delete "@a", -2, 0 [ok]';
+ }
+ is_deeply \@a, [ 4 .. 6 ], 'localize_delete "@a", -2, 0 [end]';
+}
+
+{
+ local @a = (4 .. 6);
+ local $a[4] = 7;
+ {
+  localize_delete '@main::a', -1, 0;
+  is_deeply \@a, [ 4 .. 6 ], 'localize_delete "@a", -1 (exists), 0 [ok]';
+ }
+ is_deeply \@a, [ 4 .. 6, undef, 7 ], 'localize_delete "@a", -1 (exists), 0 [end]';
+}
+
+{
+ local @a = (4 .. 6);
+ {
+  eval { localize_delete '@main::a', -4, 0 };
+  like $@, qr/Modification of non-creatable array value attempted, subscript -4/, 'localize_delete "@a", -4 (out of bounds), 0 [ok]';
+ }
+ is_deeply \@a, [ 4 .. 6 ], 'localize_delete "@a", -4 (out of bounds), 0 [end]';
+}
+
 {
  local @a = (4 .. 6);
  {