From: Nicholas Clark <nick@ccl4.org>
Date: Fri, 10 May 2013 09:03:57 +0000 (+0200)
Subject: An alternative test that CvOUTSIDE is being followed.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=p5sagit%2FDevel-Size.git;a=commitdiff_plain;h=1606314d140904fbbb6dbfae31f48552985d4c1c

An alternative test that CvOUTSIDE is being followed.

As of v5.17.2, CvOUTSIDE is NULL on cloned closures, unless they contain a
string eval. Hence the size of closures should differ, as long as Size.xs
is correctly following CvOUTSIDE.

(See blead commit a0d2bbd5c47035a4)
---

diff --git a/CHANGES b/CHANGES
index fe605c7..d290c44 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,6 @@
 Revision history for Perl extension Devel::Size.
 
+ * Alternative test for CvOUTSIDE, and one for CvPADLIST
  * v5.17 changes the type of PADLIST [CPAN #83904]
  * stubbed subs no longer have CvOUTSIDE set [CPAN #77913]
  * Fix for v5.17.2's OP slab allocator [CPAN #83903]
diff --git a/t/code.t b/t/code.t
index 1a76276..8b32e37 100644
--- a/t/code.t
+++ b/t/code.t
@@ -1,7 +1,7 @@
 #!/usr/bin/perl -w
 
 use strict;
-use Test::More tests => 13;
+use Test::More tests => 14;
 use Devel::Size ':all';
 
 sub zwapp;
@@ -66,3 +66,26 @@ bloop(42);
 my $after_size = total_size(\&bloop);
 
 cmp_ok($after_size, '>', $before_size, 'Recursion increases the PADLIST');
+
+sub closure_with_eval {
+    my $a;
+    return sub { eval ""; $a };
+}
+
+sub closure_without_eval {
+    my $a;
+    return sub { require ""; $a };
+}
+
+if ($] > 5.017001) {
+    # Again relying too much on the core's implementation, but while that holds,
+    # this does test that CvOUTSIDE() is being followed.
+    cmp_ok(total_size(closure_with_eval()), '>',
+	   total_size(closure_without_eval()) + 256,
+	   'CvOUTSIDE is now NULL on cloned closures, unless they have eval');
+} else {
+    # Seems that they differ by a few bytes on 5.8.x
+    cmp_ok(total_size(closure_with_eval()), '<=',
+	   total_size(closure_without_eval()) + 256,
+	   "CvOUTSIDE is set on all cloned closures, so these won't differ by much");
+}