From: Nicholas Clark <nick@ccl4.org>
Date: Wed, 4 May 2011 19:18:39 +0000 (+0200)
Subject: Follow mg_obj, which points to an SV.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=p5sagit%2FDevel-Size.git;a=commitdiff_plain;h=b71309488bc6064635eabcac81bb327bb6a01b93;hp=72e2658d6b79549c2318c52724ff39fd6357c359

Follow mg_obj, which points to an SV.
---

diff --git a/CHANGES b/CHANGES
index 047d682..35b7d77 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,7 +1,8 @@
 Revision history for Perl extension Devel::Size.
 
 0.75_50 2011-05-04 nicholas
- * The cores vtables are global and const, so don't count towards the size.
+ * The core's magic vtables are global constants, so aren't part of the size.
+ * Follow mg_obj
 
 0.75 2011-05-04 nicholas
  [no changes]
diff --git a/Size.xs b/Size.xs
index ff5b4e4..d1ae900 100644
--- a/Size.xs
+++ b/Size.xs
@@ -311,7 +311,7 @@ cc_opclass(const OP * const o)
 /* Figure out how much magic is attached to the SV and return the
    size */
 static void
-magic_size(const SV * const thing, struct state *st) {
+magic_size(pTHX_ const SV * const thing, struct state *st) {
   MAGIC *magic_pointer;
 
   /* Is there any? */
@@ -332,6 +332,7 @@ magic_size(const SV * const thing, struct state *st) {
         if (check_new(st, magic_pointer->mg_virtual)) {
           st->total_size += sizeof(MGVTBL);
         }
+	sv_size(aTHX_ st, magic_pointer->mg_obj, TOTAL_SIZE_RECURSION);
 
         /* Get the next in the chain */
         magic_pointer = magic_pointer->mg_moremagic;
@@ -560,7 +561,7 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
 	sv_size(aTHX_ st, SvRV_const(thing), recurse);
     else
 	st->total_size += SvLEN(thing);
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     TAG;break;
 #if PERL_VERSION <= 8
   case SVt_PVBM: TAG;
@@ -569,7 +570,7 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
 	sv_size(aTHX_ st, SvRV_const(thing), recurse);
     else
 	st->total_size += SvLEN(thing);
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     TAG;break;
 #endif
   case SVt_PVLV: TAG;
@@ -578,7 +579,7 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
 	sv_size(aTHX_ st, SvRV_const(thing), recurse);
     else
 	st->total_size += SvLEN(thing);
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     TAG;break;
     /* How much space is dedicated to the array? Not counting the
        elements in the array, mind, just the array itself */
@@ -614,7 +615,7 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
        complain about AvARYLEN() passing thing to it.  */
     sv_size(aTHX_ st, AvARYLEN(thing), recurse);
 #endif
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     TAG;break;
   case SVt_PVHV: TAG;
     /* First the base struct */
@@ -641,11 +642,11 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
         }
       }
     }
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     TAG;break;
   case SVt_PVCV: TAG;
     st->total_size += sizeof(XPVCV);
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
 
     st->total_size += ((XPVIO *) SvANY(thing))->xpv_len;
     sv_size(aTHX_ st, (SV *)CvSTASH(thing), SOME_RECURSION);
@@ -662,7 +663,7 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
 
     TAG;break;
   case SVt_PVGV: TAG;
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     st->total_size += sizeof(XPVGV);
     if(isGV_with_GP(thing)) {
 	st->total_size += GvNAMELEN(thing);
@@ -692,7 +693,7 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
     TAG;break;
   case SVt_PVFM: TAG;
     st->total_size += sizeof(XPVFM);
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     st->total_size += ((XPVIO *) SvANY(thing))->xpv_len;
     sv_size(aTHX_ st, (SV *)CvPADLIST(thing), SOME_RECURSION);
     sv_size(aTHX_ st, (SV *)CvOUTSIDE(thing), recurse);
@@ -704,7 +705,7 @@ sv_size(pTHX_ struct state *const st, const SV * const orig_thing,
     TAG;break;
   case SVt_PVIO: TAG;
     st->total_size += sizeof(XPVIO);
-    magic_size(thing, st);
+    magic_size(aTHX_ thing, st);
     if (check_new(st, (SvPVX_const(thing)))) {
       st->total_size += ((XPVIO *) SvANY(thing))->xpv_cur;
     }
diff --git a/t/magic.t b/t/magic.t
index d0f5b73..08d7eb0 100644
--- a/t/magic.t
+++ b/t/magic.t
@@ -1,7 +1,7 @@
 #!/usr/bin/perl -w
 
 use strict;
-use Test::More tests => 7;
+use Test::More tests => 11;
 use Devel::Size ':all';
 require Tie::Scalar;
 
@@ -31,3 +31,22 @@ require Tie::Scalar;
     cmp_ok($after_size, '>', $before_size, 'Still larger than initial size');
     cmp_ok($after_size, '<', $compiled_size, 'size decreases due to unmagic');
 }
+
+{
+    my $string = 'Perl Rules';
+    my $before_size = total_size($string);
+    cmp_ok($before_size, '>', length $string,
+	   'Our string has a non-zero length');
+    tie $string, 'Tie::StdScalar';
+    my $after_size = total_size($string);
+    cmp_ok($after_size, '>', $before_size, 'size increases due to magic');
+    is($string, undef, 'No value yet');
+    # This is defineately cheating, in that we're poking inside the
+    # implementation of Tie::StdScalar, but if we just write to $string, the way
+    # magic works, the (nice long) value is first written to the regular scalar,
+    # then picked up by the magic. So it grows, which defeats the purpose of the
+    # test.
+    ${tied $string} = 'X' x 1024;
+    cmp_ok(total_size($string), '>', $after_size + 1024,
+	   'the magic object is counted');
+}