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GClosure: add valgrind hints

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GClosure has been in the "allocate area before the pointer" game since
before we did this with GTypeInstance.  At the time that this was done
for GClosure, we didn't have valgrind.h in GLib.

Now that we do, we should add similar valgrind hints as the ones we did
for GTypeInstance.  This substantially reduces reports of "possibly
lost" on pretty much any program that makes use of signals.

https://bugzilla.gnome.org/show_bug.cgi?id=739850
This commit is contained in:
Ryan Lortie 2014-11-09 11:22:42 -05:00
parent b0e330b68c
commit 69fd1fd1d0
1 changed files with 38 additions and 5 deletions
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43
gobject/gclosure.c
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@ -22,6 +22,7 @@
#include "config.h"
#include "../glib/valgrind.h"
#include <string.h>
#include <ffi.h>
@ -189,14 +190,31 @@ GClosure*
g_closure_new_simple (guint sizeof_closure,
gpointer data)
{
GRealClosure *real_closure;
GClosure *closure;
gint private_size;
gchar *allocated;
g_return_val_if_fail (sizeof_closure >= sizeof (GClosure), NULL);
sizeof_closure = sizeof_closure + sizeof (GRealClosure) - sizeof (GClosure);
real_closure = g_malloc0 (sizeof_closure);
closure = &real_closure->closure;
private_size = sizeof (GRealClosure) - sizeof (GClosure);
/* See comments in gtype.c about what's going on here... */
if (RUNNING_ON_VALGRIND)
{
private_size += sizeof (gpointer);
allocated = g_malloc0 (private_size + sizeof_closure + sizeof (gpointer));
*(gpointer *) (allocated + private_size + sizeof_closure) = allocated + sizeof (gpointer);
VALGRIND_MALLOCLIKE_BLOCK (allocated + private_size, sizeof_closure + sizeof (gpointer), 0, TRUE);
VALGRIND_MALLOCLIKE_BLOCK (allocated + sizeof (gpointer), private_size - sizeof (gpointer), 0, TRUE);
}
else
allocated = g_malloc0 (private_size + sizeof_closure);
closure = (GClosure *) (allocated + private_size);
SET (closure, ref_count, 1);
SET (closure, floating, TRUE);
closure->data = data;
@ -589,7 +607,22 @@ g_closure_unref (GClosure *closure)
{
closure_invoke_notifiers (closure, FNOTIFY);
g_free (closure->notifiers);
g_free (G_REAL_CLOSURE (closure));
/* See comments in gtype.c about what's going on here... */
if (RUNNING_ON_VALGRIND)
{
gchar *allocated;
allocated = (gchar *) G_REAL_CLOSURE (closure);
allocated -= sizeof (gpointer);
g_free (allocated);
VALGRIND_FREELIKE_BLOCK (allocated + sizeof (gpointer), 0);
VALGRIND_FREELIKE_BLOCK (closure, 0);
}
else
g_free (G_REAL_CLOSURE (closure));
}
}