Message ID | 20191114144725.2310-1-marcandre.lureau@redhat.com |
---|---|
State | New |
Headers | show |
Series | [v3] qemu-gdb: add an Object pretty printer | expand |
On Thu, Nov 14, 2019 at 3:50 PM Marc-André Lureau <marcandre.lureau@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.lureau@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 > >
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)
Inspired by GObject/GType pretty printer. Example: machine_set_accel (obj=0x555556807550 [pc-i440fx-4.0-machine],... Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> --- scripts/qemu-gdb.py | 58 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) mode change 100644 => 100755 scripts/qemu-gdb.py