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d2c49106a4
This is useful for printing GValues and the content of GObjects (not the pointer). https://bugzilla.gnome.org/show_bug.cgi?id=794895
333 lines
10 KiB
Python
333 lines
10 KiB
Python
import os.path
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import gdb
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import glib_gdb
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import sys
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if sys.version_info[0] >= 3:
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long = int
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else:
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import itertools
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map = itertools.imap
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# FrameDecorator is new in gdb 7.7, so we adapt to its absence.
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try:
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import gdb.FrameDecorator
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HAVE_GDB_FRAMEDECORATOR = True
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FrameDecorator = gdb.FrameDecorator.FrameDecorator
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except ImportError:
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HAVE_GDB_FRAMEDECORATOR = False
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# This is not quite right, as local vars may override symname
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def read_global_var (symname):
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return gdb.selected_frame().read_var(symname)
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def g_type_to_typenode (gtype):
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def lookup_fundamental_type (typenode):
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if typenode == 0:
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return None
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val = read_global_var ("static_fundamental_type_nodes")
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if val == None:
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return None
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return val[typenode >> 2].address
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gtype = long(gtype)
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typenode = gtype - gtype % 4
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if typenode > (255 << 2):
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typenode = gdb.Value(typenode).cast (gdb.lookup_type("TypeNode").pointer())
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else:
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typenode = lookup_fundamental_type (typenode)
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return typenode
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def g_type_to_name (gtype):
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typenode = g_type_to_typenode(gtype)
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if typenode != None:
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return glib_gdb.g_quark_to_string (typenode["qname"])
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return None
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def is_g_type_instance (val):
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def is_g_type_instance_helper (type):
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if str(type) == "GTypeInstance":
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return True
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while type.code == gdb.TYPE_CODE_TYPEDEF:
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type = type.target()
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if type.code != gdb.TYPE_CODE_STRUCT:
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return False
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fields = type.fields()
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if len (fields) < 1:
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return False
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first_field = fields[0]
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return is_g_type_instance_helper(first_field.type)
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type = val.type
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if type.code != gdb.TYPE_CODE_PTR:
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return False
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type = type.target()
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return is_g_type_instance_helper (type)
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def g_type_name_from_instance (instance):
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if long(instance) != 0:
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try:
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inst = instance.cast (gdb.lookup_type("GTypeInstance").pointer())
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klass = inst["g_class"]
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gtype = klass["g_type"]
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name = g_type_to_name (gtype)
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return name
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except RuntimeError:
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pass
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return None
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class GTypePrettyPrinter:
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"Prints a GType instance pointer"
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def __init__ (self, val):
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self.val = val
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def to_string (self):
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name = g_type_name_from_instance (self.val)
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if name:
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return ("0x%x [%s]")% (long(self.val), name)
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return ("0x%x") % (long(self.val))
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def is_g_type_class_instance (val):
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type = val.type
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if type.code != gdb.TYPE_CODE_PTR:
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return False
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return str(type.target()) == "GTypeClass"
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class GTypeHandlePrettyPrinter:
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"Prints a GType instance"
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def __init__ (self, val, hint = ""):
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self.val = val
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self.hint = hint
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def to_string (self):
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typenode = g_type_to_typenode(self.val)
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if typenode != None:
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name = glib_gdb.g_quark_to_string (typenode["qname"])
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s = ("0x%x [%s%s")% (long(self.val), self.hint, name)
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for i in range (1, int(typenode["n_supers"])):
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node = g_type_to_typenode(typenode["supers"][i])
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if node:
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name = glib_gdb.g_quark_to_string(node["qname"])
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else:
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name = "???"
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s += "/" + name
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return s + "]"
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else:
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return ("0x%x") % (long(self.val))
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def pretty_printer_lookup (val):
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if is_g_type_instance (val):
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return GTypePrettyPrinter (val)
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if str(val.type) == "GType":
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return GTypeHandlePrettyPrinter (val)
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if is_g_type_class_instance (val):
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return GTypeHandlePrettyPrinter (val["g_type"], "g_type: ")
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return None
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def get_signal_name (id):
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if id == None:
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return None
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id = long(id)
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if id == 0:
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return None
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val = read_global_var ("g_signal_nodes")
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max_s = read_global_var ("g_n_signal_nodes")
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max_s = long(max_s)
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if id < max_s:
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return val[id]["name"].string()
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return None
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def frame_name(frame):
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return str(frame.function())
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def frame_var(frame, var):
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return frame.inferior_frame().read_var(var)
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class SignalFrame(FrameDecorator):
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def __init__ (self, frames):
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FrameDecorator.__init__(self, frames[-1])
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self.frame = frames[-1]
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self.frames = frames
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def name (self):
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return "signal-emission"
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def read_var (self, frame, name, array = None):
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try:
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v = frame_var (frame, name)
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if v == None or v.is_optimized_out:
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return None
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if array != None:
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array.append (v)
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return v
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except ValueError:
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return None
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def read_object (self, frame, name, array = None):
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try:
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v = frame_var (frame, name)
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if v == None or v.is_optimized_out:
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return None
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v = v.cast (gdb.lookup_type("GObject").pointer())
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# Ensure this is a somewhat correct object pointer
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if v != None and g_type_name_from_instance (v):
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if array != None:
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array.append (v)
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return v
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return None
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except ValueError:
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return None
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def append (self, array, obj):
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if obj != None:
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array.append (obj)
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def or_join_array (self, array):
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if len(array) == 0:
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return "???"
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else:
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return ' or '.join(set(map(str, array)))
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def get_detailed_signal_from_frame(self, frame, signal):
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detail = self.read_var (frame, "detail")
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detail = glib_gdb.g_quark_to_string (detail)
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if detail is not None:
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return signal + ":" + detail
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else:
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return detail
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def function (self):
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instances = []
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signals = []
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for frame in self.frames:
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name = frame_name(frame)
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if name == "signal_emit_unlocked_R":
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self.read_object (frame, "instance", instances)
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node = self.read_var (frame, "node")
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if node:
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signal = node["name"].string()
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signal = self.get_detailed_signal_from_frame(frame, signal)
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self.append(signals, signal)
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if name == "g_signal_emitv":
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instance_and_params = self.read_var (frame, "instance_and_params")
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if instance_and_params:
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instance = instance_and_params[0]["v_pointer"].cast (gdb.Type("GObject").pointer())
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self.append (instances, instance)
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id = self.read_var (frame, "signal_id")
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signal = get_signal_name (id)
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if signal:
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signal = self.get_detailed_signal_from_frame(frame, signal)
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self.append (signals, signal)
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if name == "g_signal_emit_valist" or name == "g_signal_emit":
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self.read_object (frame, "instance", instances)
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id = self.read_var (frame, "signal_id")
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signal = get_signal_name (id)
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if signal:
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signal = self.get_detailed_signal_from_frame(frame, signal)
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self.append (signals, signal)
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if name == "g_signal_emit_by_name":
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self.read_object (frame, "instance", instances)
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self.read_var (frame, "detailed_signal", signals)
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break
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instance = self.or_join_array (instances)
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signal = self.or_join_array (signals)
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return "<emit signal %s on instance %s>" % (signal, instance)
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def elided (self):
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return self.frames[0:-1]
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def describe (self, stream, full):
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stream.write (" " + self.function () + "\n")
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class GFrameDecorator:
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def __init__ (self, iter):
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self.queue = []
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self.iter = iter
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def __iter__ (self):
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return self
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def fill (self):
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while len(self.queue) <= 8:
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try:
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f = next(self.iter)
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self.queue.append (f)
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except StopIteration:
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return
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def find_signal_emission (self):
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for i in range (min (len(self.queue), 3)):
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if frame_name(self.queue[i]) == "signal_emit_unlocked_R":
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return i
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return -1
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def next (self):
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# Ensure we have enough frames for a full signal emission
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self.fill()
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# Are we at the end?
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if len(self.queue) == 0:
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raise StopIteration
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emission = self.find_signal_emission ()
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if emission > 0:
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start = emission
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while True:
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if start == 0:
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break
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prev_name = frame_name(self.queue[start-1])
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if prev_name.find("_marshal_") >= 0 or prev_name == "g_closure_invoke":
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start = start - 1
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else:
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break
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end = emission + 1
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while end < len(self.queue):
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if frame_name(self.queue[end]) in ["g_signal_emitv",
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"g_signal_emit_valist",
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"g_signal_emit",
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"g_signal_emit_by_name",
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"_g_closure_invoke_va"]:
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end = end + 1
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else:
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break
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signal_frames = self.queue[start:end]
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new_frames = [SignalFrame(signal_frames)]
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self.queue[start:end] = new_frames
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return self.queue.pop(0)
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def __next__ (self):
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return self.next()
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class GFrameFilter(object):
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name = 'glib'
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enabled = True
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priority = 100
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def filter(self, iterator):
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return GFrameDecorator(iterator)
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def register (obj):
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if obj == None:
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obj = gdb
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if HAVE_GDB_FRAMEDECORATOR:
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filter = GFrameFilter()
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obj.frame_filters[filter.name] = filter
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obj.pretty_printers.append(pretty_printer_lookup)
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