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import gdb
import sys
if sys.version_info[0] >= 3:
long = int
# 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_quark_to_string(quark):
if quark is None:
return None
quark = long(quark)
if quark == 0:
return None
max_q = None
try:
val = read_global_var("quarks")
try:
max_q = long(read_global_var("quark_seq_id"))
# quark_seq_id gets optimized out in some builds so work around it
except gdb.error:
pass
except Exception:
try:
val = read_global_var("g_quarks")
try:
max_q = long(read_global_var("g_quark_seq_id"))
except gdb.error:
pass
except Exception:
return None
if max_q is None or quark < max_q:
try:
return val[quark].string()
except gdb.MemoryError:
print(f"Invalid quark {quark}")
return None
# We override the node printers too, so that node->next is not expanded
class GListNodePrinter:
"Prints a GList node"
def __init__(self, val):
self.val = val
def to_string(self):
return "{data=%s, next=0x%x, prev=0x%x}" % (
str(self.val["data"]),
long(self.val["next"]),
long(self.val["prev"]),
)
class GSListNodePrinter:
"Prints a GSList node"
def __init__(self, val):
self.val = val
def to_string(self):
return "{data=%s, next=0x%x}" % (str(self.val["data"]), long(self.val["next"]))
class GListPrinter:
"Prints a GList"
class _iterator:
def __init__(self, head, listtype):
self.link = head
self.listtype = listtype
self.count = 0
def __iter__(self):
return self
def next(self):
if self.link == 0:
raise StopIteration
data = self.link["data"]
self.link = self.link["next"]
count = self.count
self.count = self.count + 1
return ("[%d]" % count, data)
__next__ = next
def __init__(self, val, listtype):
self.val = val
self.listtype = listtype
def children(self):
return self._iterator(self.val, self.listtype)
def to_string(self):
return "0x%x" % (long(self.val))
def display_hint(self):
return "array"
class GHashPrinter:
"Prints a GHashTable"
class _iterator:
class _pointer_array:
def __init__(self, ptr, big_items):
self._big_items = big_items
self._gpointer_type = gdb.lookup_type("gpointer")
item_type = (
self._gpointer_type if self._big_items else gdb.lookup_type("guint")
)
self._items = ptr.cast(item_type.pointer())
def __getitem__(self, item):
item = self._items[item]
if not self._big_items:
item = item.cast(self._gpointer_type)
return item
def __init__(self, ht, keys_are_strings):
self.ht = ht
if ht != 0:
self.keys = self._pointer_array(ht["keys"], ht["have_big_keys"])
self.values = self._pointer_array(ht["values"], ht["have_big_values"])
self.hashes = ht["hashes"]
self.size = ht["size"]
self.pos = 0
self.keys_are_strings = keys_are_strings
self.value = None
def __iter__(self):
return self
def next(self):
if self.ht == 0:
raise StopIteration
if self.value is not None:
v = self.value
self.value = None
return v
while long(self.pos) < long(self.size):
if long(self.hashes[self.pos]) >= 2:
key = self.keys[self.pos]
val = self.values[self.pos]
if self.keys_are_strings:
key = key.cast(gdb.lookup_type("char").pointer())
# Queue value for next result
self.value = ("[%dv]" % (self.pos), val)
# Increment pos and return key
key = ("[%dk]" % (self.pos), key)
self.pos += 1
return key
self.pos += 1
raise StopIteration
__next__ = next
def __init__(self, val):
self.val = val
self.keys_are_strings = False
try:
string_hash = read_global_var("g_str_hash")
except Exception:
string_hash = None
if (
self.val != 0
and string_hash is not None
and self.val["hash_func"] == string_hash
):
self.keys_are_strings = True
def children(self):
return self._iterator(self.val, self.keys_are_strings)
def to_string(self):
return "0x%x" % (long(self.val))
def display_hint(self):
return "map"
def pretty_printer_lookup(val):
# None yet, want things like hash table and list
type = val.type.unqualified()
# If it points to a reference, get the reference.
if type.code == gdb.TYPE_CODE_REF:
type = type.target()
if type.code == gdb.TYPE_CODE_PTR:
type = type.target().unqualified()
t = str(type)
if t == "GList":
return GListPrinter(val, "GList")
if t == "GSList":
return GListPrinter(val, "GSList")
if t == "GHashTable":
return GHashPrinter(val)
else:
t = str(type)
if t == "GList":
return GListNodePrinter(val)
if t == "GSList *":
return GListPrinter(val, "GSList")
return None
def register(obj):
if obj is None:
obj = gdb
obj.pretty_printers.append(pretty_printer_lookup)
class ForeachCommand(gdb.Command):
"""Foreach on list"""
def __init__(self):
super(ForeachCommand, self).__init__(
"gforeach", gdb.COMMAND_DATA, gdb.COMPLETE_SYMBOL
)
def valid_name(self, name):
if not name[0].isalpha():
return False
return True
def parse_args(self, arg):
i = arg.find(" ")
if i <= 0:
raise Exception("No var specified")
var = arg[:i]
if not self.valid_name(var):
raise Exception("Invalid variable name")
while i < len(arg) and arg[i].isspace():
i = i + 1
if arg[i : i + 2] != "in":
raise Exception("Invalid syntax, missing in")
i = i + 2
while i < len(arg) and arg[i].isspace():
i = i + 1
colon = arg.find(":", i)
if colon == -1:
raise Exception("Invalid syntax, missing colon")
val = arg[i:colon]
colon = colon + 1
while colon < len(arg) and arg[colon].isspace():
colon = colon + 1
command = arg[colon:]
return (var, val, command)
def do_iter(self, arg, item, command):
item = item.cast(gdb.lookup_type("void").pointer())
item = long(item)
to_eval = "set $%s = (void *)0x%x\n" % (arg, item)
gdb.execute(to_eval)
gdb.execute(command)
def slist_iterator(self, arg, container, command):
list_element = container.cast(gdb.lookup_type("GSList").pointer())
while long(list_element) != 0:
self.do_iter(arg, list_element["data"], command)
list_element = list_element["next"]
def list_iterator(self, arg, container, command):
list_element = container.cast(gdb.lookup_type("GList").pointer())
while long(list_element) != 0:
self.do_iter(arg, list_element["data"], command)
list_element = list_element["next"]
def pick_iterator(self, container):
t = container.type.unqualified()
if t.code == gdb.TYPE_CODE_PTR:
t = t.target().unqualified()
t = str(t)
if t == "GSList":
return self.slist_iterator
if t == "GList":
return self.list_iterator
raise Exception("Invalid container type %s" % (str(container.type)))
def invoke(self, arg, from_tty):
(var, container, command) = self.parse_args(arg)
container = gdb.parse_and_eval(container)
func = self.pick_iterator(container)
func(var, container, command)
ForeachCommand()
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