mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-11-18 17:18:42 +00:00
267 lines
8.7 KiB
Python
267 lines
8.7 KiB
Python
class BIRDPrinter:
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def __init__(self, val):
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self.val = val
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@classmethod
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def lookup(cls, val):
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if val.type.code != cls.typeCode:
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return None
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if val.type.tag != cls.typeTag:
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return None
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return cls(val)
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class BIRDFValPrinter(BIRDPrinter):
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"Print BIRD\s struct f_val"
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typeCode = gdb.TYPE_CODE_STRUCT
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typeTag = "f_val"
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codemap = {
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"T_INT": "i",
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"T_BOOL": "i",
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"T_PAIR": "i",
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"T_QUAD": "i",
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"T_ENUM_RTS": "i",
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"T_ENUM_BGP_ORIGIN": "i",
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"T_ENUM_SCOPE": "i",
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"T_ENUM_RTC": "i",
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"T_ENUM_RTD": "i",
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"T_ENUM_ROA": "i",
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"T_ENUM_NETTYPE": "i",
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"T_ENUM_RA_PREFERENCE": "i",
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"T_ENUM_AF": "i",
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"T_IP": "ip",
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"T_NET": "net",
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"T_STRING": "s",
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"T_PATH_MASK": "path_mask",
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"T_PATH": "ad",
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"T_CLIST": "ad",
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"T_EC": "ec",
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"T_ECLIST": "ad",
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"T_LC": "lc",
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"T_LCLIST": "ad",
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"T_RD": "ec",
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"T_PATH_MASK_ITEM": "pmi",
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"T_SET": "t",
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"T_PREFIX_SET": "ti",
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}
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def to_string(self):
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code = self.val['type']
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if code.type.code != gdb.TYPE_CODE_ENUM or code.type.tag != "f_type":
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raise Exception("Strange 'type' element in f_val")
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if str(code) == "T_VOID":
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return "T_VOID"
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else:
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return "(%(c)s) %(v)s" % { "c": code, "v": self.val['val'][self.codemap[str(code)]] }
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def display_hint(self):
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return "map"
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class BIRDFValStackPrinter(BIRDPrinter):
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"Print BIRD's struct f_val_stack"
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typeCode = gdb.TYPE_CODE_STRUCT
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typeTag = "f_val_stack"
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def to_string(self):
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cnt = self.val['cnt']
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return ("Value stack (%(cnt)d):\n\t" % { "cnt": cnt }) + \
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"\n\t".join([ (".val[%(n) 3d] = " % { "n": n}) + str(self.val['val'][n]) for n in range(cnt-1, -1, -1) ])
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def display_hint(self):
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return "map"
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class BIRDFInstPrinter(BIRDPrinter):
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"Print BIRD's struct f_inst"
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typeCode = gdb.TYPE_CODE_STRUCT
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typeTag = "f_inst"
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def to_string(self):
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code = self.val['fi_code']
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if str(code) == "FI_NOP":
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return str(code) + ": " + str(self.val.cast(gdb.lookup_type("const char [%(siz)d]" % { "siz": self.val.type.sizeof })))
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return "%(code)s:\t%(lineno) 6dL\t%(size)6dS\tnext = %(next)s: .i_%(code)s = %(union)s" % {
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"code": str(code),
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"lineno": self.val['lineno'],
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"size": self.val['size'],
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"next": str(self.val['next']),
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"union": str(self.val['i_' + str(code)])
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}
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# def children(self): # children iterator
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def display_hint(self):
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return "map"
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class BIRDFLineItemPrinter(BIRDPrinter):
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"Print BIRD's struct f_line_item"
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typeCode = gdb.TYPE_CODE_STRUCT
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typeTag = "f_line_item"
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def to_string(self):
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code = self.val['fi_code']
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if str(code) == "FI_NOP":
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return str(code) + ": " + str(self.val.cast(gdb.lookup_type("const char [%(siz)d]" % { "siz": self.val.type.sizeof })))
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return "%(code)s:\t%(lineno) 6dL\t%(flags)2dF: .i_%(code)s = %(union)s" % {
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"code": str(code),
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"lineno": self.val['lineno'],
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"flags": self.val['flags'],
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"union": str(self.val['i_' + str(code)])
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}
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class BIRDFLinePrinter(BIRDPrinter):
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"Print BIRD's struct f_line"
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typeCode = gdb.TYPE_CODE_STRUCT
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typeTag = "f_line"
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def to_string(self):
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cnt = self.val['len']
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return ("FLine (%(cnt)d, args=%(args)d): " % { "cnt": cnt, "args" : self.val['args'] } + \
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", ".join([
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".items[%(n) 3d] = %(code)s" % {
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"n": n,
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"code": str(self.val['items'][n]['fi_code']),
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} if n % 8 == 0 else str(self.val['items'][n]['fi_code']) for n in range(cnt)]))
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class BIRDFExecStackPrinter(BIRDPrinter):
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"Print BIRD's struct f_exec_stack"
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typeCode = gdb.TYPE_CODE_STRUCT
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typeTag = "f_exec_stack"
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def to_string(self):
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cnt = self.val['cnt']
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return ("Exec stack (%(cnt)d):\n\t" % { "cnt": cnt }) + \
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"\n\t".join([ ".item[%(n) 3d] = %(retflag)d V%(ventry) 3d P%(pos) 4d %(line)s" % {
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"retflag": self.val['item'][n]['emask'],
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"ventry": self.val['item'][n]['ventry'],
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"pos": self.val['item'][n]['pos'],
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"line": str(self.val['item'][n]['line'].dereference()),
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"n": n
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} for n in range(cnt-1, -1, -1) ])
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class BIRD:
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def skip_back(t, i, v):
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if isinstance(t, str):
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t = gdb.lookup_type(t)
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elif isinstance(t, gdb.Value):
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t = gdb.lookup_type(t.string())
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elif not isinstance(t, gdb.Type):
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raise Exception(f"First argument of skip_back(t, i, v) must be a type, got {type(t)}")
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t = t.strip_typedefs()
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nullptr = gdb.Value(0).cast(t.pointer())
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if isinstance(i, gdb.Value):
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i = i.string()
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elif not isinstance(i, str):
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raise Exception(f"Second argument of skip_back(t, i, v) must be a item name, got {type(i)}")
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if not isinstance(v, gdb.Value):
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raise Exception(f"Third argument of skip_back(t, i, v) must be a value, got {type(v)}")
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if v.type.code != gdb.TYPE_CODE_PTR and v.type.code != gdb.TYPE_CODE_REF:
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raise Exception(f"Third argument of skip_back(t, i, v) must be a pointer, is {v.type} ({v.type.code})")
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if v.type.target().strip_typedefs() != nullptr[i].type:
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raise Exception(f"Third argument of skip_back(t, i, v) points to type {v.type.target().strip_typedefs()}, should be {nullptr[i].type}")
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uintptr_t = gdb.lookup_type("uintptr_t")
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taddr = v.dereference().address.cast(uintptr_t) - nullptr[i].address.cast(uintptr_t)
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return gdb.Value(taddr).cast(t.pointer())
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class skip_back_gdb(gdb.Function):
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"Given address of a structure item, returns address of the structure, as the SKIP_BACK macro does"
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def __init__(self):
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gdb.Function.__init__(self, "SKIP_BACK")
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def invoke(self, t, i, v):
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return BIRD.skip_back(t, i, v)
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BIRD.skip_back_gdb()
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class BIRDList:
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def __init__(self, val):
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ltype = val.type.strip_typedefs()
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if ltype.code != gdb.TYPE_CODE_UNION or ltype.tag != "list":
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raise Exception(f"Not a list, is type {ltype}")
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self.head = val["head"]
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self.tail_node = val["tail_node"]
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if str(self.head.address) == '0x0':
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raise Exception("List head is NULL")
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if str(self.tail_node["prev"].address) == '0x0':
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raise Exception("List tail is NULL")
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def walk(self, do):
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cur = self.head
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while cur.dereference() != self.tail_node:
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do(cur)
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cur = cur.dereference()["next"]
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class BIRDListLength(gdb.Function):
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"""Returns length of the list, as in
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print $list_length(routing_tables)"""
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def __init__(self):
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super(BIRDListLength, self).__init__("list_length")
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def count(self, _):
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self.cnt += 1
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def invoke(self, l):
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self.cnt = 0
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BIRDList(l).walk(self.count)
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return self.cnt
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BIRDListLength()
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class BIRDListItem(gdb.Function):
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"""Returns n-th item of the list."""
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def __init__(self):
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super(BIRDListItem, self).__init__("list_item")
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class BLException(Exception):
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def __init__(self, node, msg):
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Exception.__init__(self, msg)
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self.node = node
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def count(self, node):
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if self.cnt == self.pos:
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raise self.BLException(node, "Node found")
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self.cnt += 1
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def invoke(self, l, n, t=None, item="n"):
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self.cnt = 0
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self.pos = n
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bl = BIRDList(l)
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try:
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bl.walk(self.count)
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except self.BLException as e:
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if t is None:
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return e.node
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else:
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return BIRD.skip_back(t, item, e.node)
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raise Exception("List too short")
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BIRDListItem()
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def register_printers(objfile):
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objfile.pretty_printers.append(BIRDFInstPrinter.lookup)
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objfile.pretty_printers.append(BIRDFValPrinter.lookup)
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objfile.pretty_printers.append(BIRDFValStackPrinter.lookup)
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objfile.pretty_printers.append(BIRDFLineItemPrinter.lookup)
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objfile.pretty_printers.append(BIRDFLinePrinter.lookup)
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objfile.pretty_printers.append(BIRDFExecStackPrinter.lookup)
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register_printers(gdb.current_objfile())
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print("BIRD pretty printers loaded OK.")
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