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