On Thu, Nov 14, 2019 at 3:50 PM Marc-André Lureau
<marcandre.lur...@redhat.com> wrote:
>
> Inspired by GObject/GType pretty printer.
>
> Example:
> machine_set_accel (obj=0x555556807550 [pc-i440fx-4.0-machine],...
>
> Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com>
ping
> ---
> scripts/qemu-gdb.py | 58 +++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 58 insertions(+)
> mode change 100644 => 100755 scripts/qemu-gdb.py
>
> diff --git a/scripts/qemu-gdb.py b/scripts/qemu-gdb.py
> old mode 100644
> new mode 100755
> index f2a305c42e..b9fc1d10d4
> --- a/scripts/qemu-gdb.py
> +++ b/scripts/qemu-gdb.py
> @@ -18,6 +18,9 @@ import gdb
>
> import os, sys
>
> +if sys.version_info[0] < 3:
> + int = long
> +
> # Annoyingly, gdb doesn't put the directory of scripts onto the
> # module search path. Do it manually.
>
> @@ -44,3 +47,58 @@ coroutine.CoroutinePCFunction()
> # Default to silently passing through SIGUSR1, because QEMU sends it
> # to itself a lot.
> gdb.execute('handle SIGUSR1 pass noprint nostop')
> +
> +
> +def is_object(val):
> + def is_object_helper(type):
> + if str(type) == "Object":
> + return True
> +
> + while type.code == gdb.TYPE_CODE_TYPEDEF:
> + type = type.target()
> +
> + if type.code != gdb.TYPE_CODE_STRUCT:
> + return False
> +
> + fields = type.fields()
> + if len (fields) < 1:
> + return False
> +
> + first_field = fields[0]
> + return is_object_helper(first_field.type)
> +
> + type = val.type
> + if type.code != gdb.TYPE_CODE_PTR:
> + return False
> + type = type.target()
> + return is_object_helper (type)
> +
> +
> +def object_class_name(instance):
> + try:
> + inst = instance.cast(gdb.lookup_type("Object").pointer())
> + klass = inst["class"]
> + typ = klass["type"]
> + return typ["name"].string()
> + except RuntimeError:
> + pass
> +
> +
> +class ObjectPrinter:
> + def __init__(self, val):
> + self.val = val
> +
> + def to_string(self):
> + name = object_class_name(self.val)
> + if name:
> + return ("0x%x [%s]")% (int(self.val), name)
> + return ("0x%x") % (int(self.val))
> +
> +
> +def lookup_type(val):
> + if is_object(val):
> + return ObjectPrinter(val)
> + return None
> +
> +
> +gdb.pretty_printers.append(lookup_type)
> --
> 2.24.0
>
>
--
Marc-André Lureau
