Archive for November, 2008

Gdb is dead. Long live Gdb!

Tuesday, November 18th, 2008

All hail Archer and Tom Tromeys python gdb integration:

Before:


(gdb) bt
#0  nautilus_file_unref (file=0xdbbc60) at nautilus-file.c:724
#1  0x004a9e74 in nautilus_directory_async_state_changed (directory=0x7bf090) at nautilus-directory-async.c:4891
#2  0x004ae363 in nautilus_directory_call_when_ready_internal (directory=0x7bf090, file=0xdbbc60, file_attributes=3, wait_for_file_list=0,
directory_callback=<value optimized out>, file_callback=0x4c4b80 <file_list_file_ready_callback>, callback_data=0x9729c0) at nautilus-directory-async.c:1344
#3  0x004fcad1 in vfs_file_call_when_ready (file=0xc19768, file_attributes=0, callback=0, callback_data=<value optimized out>) at nautilus-vfs-file.c:68
#4  0x004c69e1 in nautilus_file_list_call_when_ready (file_list=<value optimized out>, attributes=3, handle=0x972880, callback=0x4eaa80 <activate_activation_uris_ready_callback>, callback_data=0x972830) at nautilus-file.c:6900
#5  0x0046f52a in fm_directory_view_activate_files (view=0xa07430, files=0x1109480, mode=NAUTILUS_WINDOW_OPEN_ACCORDING_TO_MODE, flags=0, confirm_multiple=1) at fm-directory-view.c:703
#6  0xf4fbf6fd in IA__g_closure_invoke (closure=0xa43740, returnvalue=0x0, n_param_values=2, param_values=0x110d950, invocation_hint=0x7fffffffcc10) at gclosure.c:767
#7  0xf4fd6760 in signal_emit_unlocked_R (node=0xa360b0, detail=0, instance=0x92d340, emission_return=0x0, instance_and_params=0x110d950) at gsignal.c:3244
#8  0xf4fd7e49 in IA__g_signal_emit_valist (instance=0x92d340, signal_id=<value optimized out>, detail=0, var_args=0x7fffffffcdf0) at gsignal.c:2977
#9  0xf4fd8383 in IA__g_signal_emit (instance=0xdbbc60, signal_id=12687208, detail=0) at gsignal.c:3034
#10 0x004d5405 in activate_selected_items (container=0x92d340) at nautilus-icon-container.c:6669
#11 0x0004df20d in item_event_callback (item=<value optimized out>, event=0x7fffffffd3b0, data=<value optimized out>) at nautilus-icon-container.c:6237
#12 0xf7dcde38 in eel_marshal_BOOLEAN__BOXED (closure=0xf0b7f0, returnvalue=0x7fffffffd130, n_param_values=<value optimized out>, param_values=0x1113d80,
invocation_hint=<value optimized out>, marshal_data=0x4decc0) at eel-marshal.c:121
#13 0xf4fbf6fd in IA__g_closure_invoke (closure=0xf0b7f0, returnvalue=0x7fffffffd130, n_param_values=2, param_values=0x1113d80, invocation_hint=0x7fffffffd0f0) at gclosure.c:767
#14 0xf4fd6760 in signal_emit_unlocked_R (node=0xa3ade0, detail=0, instance=0xd6ed00, emission_return=0x7fffffffd270, instance_and_params=0x1113d80) at gsignal.c:3244
#15 0xf4fd7cf8 in IA__g_signal_emit_valist (instance=0xd6ed00, signal_id=<value optimized out>, detail=0, var_args=0x7fffffffd2d0) at gsignal.c:2987
#16 0xf4fd8383 in IA__g_signal_emit (instance=0xdbbc60, signal_id=12687208, detail=0) at gsignal.c:3034
#17 0xf7dacca8 in emit_event (canvas=<value optimized out>, event=<value optimized out>) at eel-canvas.c:2518
#18 0x004dd749 in button_press_event (widget=0x92d340, event=0x100a100) at nautilus-icon-container.c:4183
#19 0xf67ac148 in _gtk_marshal_BOOLEAN__BOXED (closure=0x7ee870, returnvalue=0x7fffffffd6c0, n_param_values=<value optimized out>, param_values=0x112c0f0,
invocation_hint=<value optimized out>, marshal_data=0x4dd6b0) at gtkmarshalers.c:84
#20 0xf4fbf6fd in IA__g_closure_invoke (closure=0x7ee870, returnvalue=0x7fffffffd6c0, n_param_values=2, param_values=0x112c0f0, invocation_hint=0x7fffffffd680) at gclosure.c:767
#21 0x4fd6432 in signal_emit_unlocked_R (node=0x7eea00, detail=0, instance=0x92d340, emission_return=0x7fffffffd800, instance_and_params=0x112c0f0) at gsignal.c:3282
#22 0xf4fd7cf8 in IA__g_signal_emit_valist (instance=0x92d340, signal_id=<value optimized out>, detail=0, var_args=0x7fffffffd860) at gsignal.c:2987
#23 0xf4fd8383 in IA__g_signal_emit (instance=0xdbbc60, signal_id=12687208, detail=0) at gsignal.c:3034
#24 0xf68aec3e in gtk_widget_event_internal (widget=0x92d340, event=0x100a100) at gtkwidget.c:4745
...

After: (interesting areas marked out)

(gdb) gbt
#0  nautilus_file_unref (file=<NautilusVFSFile:0xdbbc60>) at nautilus-file.c:724
#1  0x004a9e74 in nautilus_directory_async_state_changed (directory=<NautilusVFSDirectory:0x7bf090>) at nautilus-directory-async.c:4891
#2  0x004ae363 in nautilus_directory_call_when_ready_internal (directory=<NautilusVFSDirectory:0x7bf090>, file=<NautilusVFSFile:0xdbbc60>, file_attributes=3, wait_for_file_list=0, directory_callback=<value optimized out>, file_callback=0x4c4b80 <file_list_file_ready_callback>, callback_data=0x9729c0) at nautilus-directory-async.c:1344
#3  0x004fcad1 in vfs_file_call_when_ready (file=0xc19768, file_attributes=0, callback=0, callback_data=<value optimized out>) at nautilus-vfs-file.c:68
#4  0x004c69e1 in nautilus_file_list_call_when_ready (file_list=<value optimized out>, attributes=3, handle=0x972880, callback=0x4eaa80 <activate_activation_uris_ready_callback>, callback_data=0x972830) at nautilus-file.c:6900
# Emit signal activate on instance <FMIconContainer:0x92d340>
#9  0xf4fd8383 in g_signal_emit (instance=0xdbbc60, signal_id=12687208, detail=0) at gsignal.c:3034
#10 0x004d5405 in activate_selected_items (container=<FMIconContainer:0x92d340>) at nautilus-icon-container.c:6669
#11 0x004df20d in item_event_callback (item=<value optimized out>, event=0x7fffffffd3b0, data=<value optimized out>) at nautilus-icon-container.c:6237
# Emit signal event on instance <NautilusIconCanvasItem:0xd6ed00>
#16 0xf4fd8383 in g_signal_emit (instance=0xdbbc60, signal_id=12687208, detail=0) at gsignal.c:3034
#17 0xf7dacca8 in emit_event (canvas=<value optimized out>, event=<value optimized out>) at eel-canvas.c:2518
#18 0x004dd749 in button_press_event (widget=<FMIconContainer:0x92d340>, event=0x100a100) at nautilus-icon-container.c:4183
# Emit signal button-press-event on instance <FMIconContainer:0x92d340>
#23 0xf4fd8383 in g_signal_emit (instance=0xdbbc60, signal_id=12687208, detail=0) at gsignal.c:3034
#24 0xf68aec3e in gtk_widget_event_internal (widget=<FMIconContainer:0x92d340>, event=0x100a100) at gtkwidget.c:4745
...

As a bonus, I throw in the break_finalize command:


(gdb) p file
$1 = (NautilusFile *) 0xdbbc60
(gdb) break_finalize file
Breakpoint 2 at 0x7ffff4fc3b00: file gobject.c, line 742.
(gdb) c
Continuing.
Breakpoint 2, g_object_finalize (object=0xdbbc60) at gobject.c:742
742     {

All code availible via git from http://www.gnome.org/~alexl/git/gnome-gdb.git. Needs latest version of the archer-tromey-python branch from Archer git.

If you have other cool gdb hacks please send them so we can collect them all in the same place.

A small preview of subwindowless Gtk+

Wednesday, November 5th, 2008

Before:

After:

This code is still early in progress work, but it shows a lot of promise.

Note that the effect in the videos above is somewhat exagurated by doing two ssh forwards over the network so that i could screengrab the flicker, its not as obvious in plain local use.

Gtk can haz aliens too!