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class BIRDPrinter:
def __init__(self, val):
self.val = val
@classmethod
def lookup(cls, val):
if val.type.code != cls.typeCode:
return None
if val.type.tag != cls.typeTag:
return None
return cls(val)
class BIRDFValPrinter(BIRDPrinter):
"Print BIRD\s struct f_val"
typeCode = gdb.TYPE_CODE_STRUCT
typeTag = "f_val"
codemap = {
"T_INT": "i",
"T_BOOL": "i",
"T_PAIR": "i",
"T_QUAD": "i",
"T_ENUM_RTS": "i",
"T_ENUM_BGP_ORIGIN": "i",
"T_ENUM_SCOPE": "i",
"T_ENUM_RTC": "i",
"T_ENUM_RTD": "i",
"T_ENUM_ROA": "i",
"T_ENUM_NETTYPE": "i",
"T_ENUM_RA_PREFERENCE": "i",
"T_ENUM_AF": "i",
"T_IP": "ip",
"T_NET": "net",
"T_STRING": "s",
"T_PATH_MASK": "path_mask",
"T_PATH": "ad",
"T_CLIST": "ad",
"T_EC": "ec",
"T_ECLIST": "ad",
"T_LC": "lc",
"T_LCLIST": "ad",
"T_RD": "ec",
"T_PATH_MASK_ITEM": "pmi",
"T_SET": "t",
"T_PREFIX_SET": "ti",
}
def to_string(self):
code = self.val['type']
if code.type.code != gdb.TYPE_CODE_ENUM or code.type.tag != "f_type":
raise Exception("Strange 'type' element in f_val")
if str(code) == "T_VOID":
return "T_VOID"
else:
return "(%(c)s) %(v)s" % { "c": code, "v": self.val['val'][self.codemap[str(code)]] }
def display_hint(self):
return "map"
class BIRDFValStackPrinter(BIRDPrinter):
"Print BIRD's struct f_val_stack"
typeCode = gdb.TYPE_CODE_STRUCT
typeTag = "f_val_stack"
def to_string(self):
cnt = self.val['cnt']
return ("Value stack (%(cnt)d):\n\t" % { "cnt": cnt }) + \
"\n\t".join([ (".val[%(n) 3d] = " % { "n": n}) + str(self.val['val'][n]) for n in range(cnt-1, -1, -1) ])
def display_hint(self):
return "map"
class BIRDFInstPrinter(BIRDPrinter):
"Print BIRD's struct f_inst"
typeCode = gdb.TYPE_CODE_STRUCT
typeTag = "f_inst"
def to_string(self):
code = self.val['fi_code']
if str(code) == "FI_NOP":
return str(code) + ": " + str(self.val.cast(gdb.lookup_type("const char [%(siz)d]" % { "siz": self.val.type.sizeof })))
return "%(code)s:\t%(lineno) 6dL\t%(size)6dS\tnext = %(next)s: .i_%(code)s = %(union)s" % {
"code": str(code),
"lineno": self.val['lineno'],
"size": self.val['size'],
"next": str(self.val['next']),
"union": str(self.val['i_' + str(code)])
}
# def children(self): # children iterator
def display_hint(self):
return "map"
class BIRDFLineItemPrinter(BIRDPrinter):
"Print BIRD's struct f_line_item"
typeCode = gdb.TYPE_CODE_STRUCT
typeTag = "f_line_item"
def to_string(self):
code = self.val['fi_code']
if str(code) == "FI_NOP":
return str(code) + ": " + str(self.val.cast(gdb.lookup_type("const char [%(siz)d]" % { "siz": self.val.type.sizeof })))
return "%(code)s:\t%(lineno) 6dL\t%(flags)2dF: .i_%(code)s = %(union)s" % {
"code": str(code),
"lineno": self.val['lineno'],
"flags": self.val['flags'],
"union": str(self.val['i_' + str(code)])
}
class BIRDFLinePrinter(BIRDPrinter):
"Print BIRD's struct f_line"
typeCode = gdb.TYPE_CODE_STRUCT
typeTag = "f_line"
def to_string(self):
cnt = self.val['len']
return ("FLine (%(cnt)d, args=%(args)d): " % { "cnt": cnt, "args" : self.val['args'] } + \
", ".join([
".items[%(n) 3d] = %(code)s" % {
"n": n,
"code": str(self.val['items'][n]['fi_code']),
} if n % 8 == 0 else str(self.val['items'][n]['fi_code']) for n in range(cnt)]))
class BIRDFExecStackPrinter(BIRDPrinter):
"Print BIRD's struct f_exec_stack"
typeCode = gdb.TYPE_CODE_STRUCT
typeTag = "f_exec_stack"
def to_string(self):
cnt = self.val['cnt']
return ("Exec stack (%(cnt)d):\n\t" % { "cnt": cnt }) + \
"\n\t".join([ ".item[%(n) 3d] = %(retflag)d V%(ventry) 3d P%(pos) 4d %(line)s" % {
"retflag": self.val['item'][n]['emask'],
"ventry": self.val['item'][n]['ventry'],
"pos": self.val['item'][n]['pos'],
"line": str(self.val['item'][n]['line'].dereference()),
"n": n
} for n in range(cnt-1, -1, -1) ])
class BIRD:
def skip_back(t, i, v):
if isinstance(t, str):
t = gdb.lookup_type(t)
elif isinstance(t, gdb.Value):
t = gdb.lookup_type(t.string())
elif not isinstance(t, gdb.Type):
raise Exception(f"First argument of skip_back(t, i, v) must be a type, got {type(t)}")
t = t.strip_typedefs()
nullptr = gdb.Value(0).cast(t.pointer())
if isinstance(i, gdb.Value):
i = i.string()
elif not isinstance(i, str):
raise Exception(f"Second argument of skip_back(t, i, v) must be a item name, got {type(i)}")
if not isinstance(v, gdb.Value):
raise Exception(f"Third argument of skip_back(t, i, v) must be a value, got {type(v)}")
if v.type.code != gdb.TYPE_CODE_PTR and v.type.code != gdb.TYPE_CODE_REF:
raise Exception(f"Third argument of skip_back(t, i, v) must be a pointer, is {v.type} ({v.type.code})")
if v.type.target().strip_typedefs() != nullptr[i].type:
raise Exception(f"Third argument of skip_back(t, i, v) points to type {v.type.target().strip_typedefs()}, should be {nullptr[i].type}")
uintptr_t = gdb.lookup_type("uintptr_t")
taddr = v.dereference().address.cast(uintptr_t) - nullptr[i].address.cast(uintptr_t)
return gdb.Value(taddr).cast(t.pointer())
class skip_back_gdb(gdb.Function):
"Given address of a structure item, returns address of the structure, as the SKIP_BACK macro does"
def __init__(self):
gdb.Function.__init__(self, "SKIP_BACK")
def invoke(self, t, i, v):
return BIRD.skip_back(t, i, v)
BIRD.skip_back_gdb()
class BIRDList:
def __init__(self, val):
ltype = val.type.strip_typedefs()
if ltype.code != gdb.TYPE_CODE_UNION or ltype.tag != "list":
raise Exception(f"Not a list, is type {ltype}")
self.head = val["head"]
self.tail_node = val["tail_node"]
if str(self.head.address) == '0x0':
raise Exception("List head is NULL")
if str(self.tail_node["prev"].address) == '0x0':
raise Exception("List tail is NULL")
def walk(self, do):
cur = self.head
while cur.dereference() != self.tail_node:
do(cur)
cur = cur.dereference()["next"]
class BIRDListLength(gdb.Function):
"""Returns length of the list, as in
print $list_length(routing_tables)"""
def __init__(self):
super(BIRDListLength, self).__init__("list_length")
def count(self, _):
self.cnt += 1
def invoke(self, l):
self.cnt = 0
BIRDList(l).walk(self.count)
return self.cnt
BIRDListLength()
class BIRDListItem(gdb.Function):
"""Returns n-th item of the list."""
def __init__(self):
super(BIRDListItem, self).__init__("list_item")
class BLException(Exception):
def __init__(self, node, msg):
Exception.__init__(self, msg)
self.node = node
def count(self, node):
if self.cnt == self.pos:
raise self.BLException(node, "Node found")
self.cnt += 1
def invoke(self, l, n, t=None, item="n"):
self.cnt = 0
self.pos = n
bl = BIRDList(l)
try:
bl.walk(self.count)
except self.BLException as e:
if t is None:
return e.node
else:
return BIRD.skip_back(t, item, e.node)
raise Exception("List too short")
BIRDListItem()
def register_printers(objfile):
objfile.pretty_printers.append(BIRDFInstPrinter.lookup)
objfile.pretty_printers.append(BIRDFValPrinter.lookup)
objfile.pretty_printers.append(BIRDFValStackPrinter.lookup)
objfile.pretty_printers.append(BIRDFLineItemPrinter.lookup)
objfile.pretty_printers.append(BIRDFLinePrinter.lookup)
objfile.pretty_printers.append(BIRDFExecStackPrinter.lookup)
register_printers(gdb.current_objfile())
print("BIRD pretty printers loaded OK.")
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