mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 17:51:53 +00:00
468 lines
15 KiB
Python
468 lines
15 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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t = val.type.strip_typedefs()
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if t.code != cls.typeCode:
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return None
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if t.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_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_BYTESTRING": "bs",
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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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class BIRDResourceSize():
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def __init__(self, netto, overhead, free):
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self.netto = netto
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self.overhead = overhead
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self.free = free
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def __str__(self):
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ns = str(self.netto)
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os = str(self.overhead)
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fs = str(self.free)
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return "{: >12s} | {: >12s} | {: >12s}".format(ns, os, fs)
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def __add__(self, val):
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return BIRDResourceSize(self.netto + val.netto, self.overhead + val.overhead, self.free + val.free)
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class BIRDResource():
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def __init__(self, val):
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self.val = val
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def __str__(self):
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return f"Item {self.val.address} of class \"{self.val['class']['name'].string()}\""
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def memsize(self):
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if str(self.val["class"]["memsize"]) == '0x0':
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size = self.val["class"]["size"]
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ressize = gdb.lookup_type("struct resource").sizeof
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return BIRDResourceSize(size - ressize, ressize, 0)
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else:
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raise Exception(f"Resource class {self.val['class']['name']} with defined memsize() not known by Python")
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def parse(self):
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pass
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class BIRDMBResource(BIRDResource):
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def __init__(self, val):
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self.mbtype = gdb.lookup_type("struct mblock")
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self.val = val.cast(self.mbtype)
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def memsize(self):
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return BIRDResourceSize(self.val["size"], 8 + self.mbtype.sizeof, 0)
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def __str__(self):
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return f"Standalone memory block {self.val.address} of size {self.val['size']}, data at {self.val['data'].address}"
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class BIRDLinPoolResource(BIRDResource):
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def __init__(self, val):
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self.lptype = gdb.lookup_type("struct linpool")
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self.val = val.cast(self.lptype)
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self.info = None
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def count_chunk(self, which):
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cnt = 0
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chunk = self.val[which]
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while str(chunk) != '0x0':
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cnt += 1
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chunk = chunk.dereference()["next"]
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return cnt
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def parse(self):
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self.info = {
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"std_chunks": self.count_chunk("first"),
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"large_chunks": self.count_chunk("first_large"),
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}
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def memsize(self):
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if self.info is None:
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self.parse()
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overhead = (8 - 8*self.val["use_pages"]) + gdb.lookup_type("struct lp_chunk").sizeof
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return BIRDResourceSize(
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self.val["total"] + self.val["total_large"],
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(self.info["std_chunks"] + self.info["large_chunks"]) * overhead,
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0)
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def __str__(self):
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if self.info is None:
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self.parse()
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return f"Linpool {self.val.address} with {self.info['std_chunks']} standard chunks of size {self.val['chunk_size']} and {self.info['large_chunks']} large chunks"
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class BIRDSlabResource(BIRDResource):
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def __init__(self, val):
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self.slabtype = gdb.lookup_type("struct slab")
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self.val = val.cast(self.slabtype)
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self.info = None
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def count_heads_item(self, item):
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self.hcnt += 1
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self.used += item.dereference().cast(self.slheadtype)["num_full"]
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def count_heads(self, which):
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self.hcnt = 0
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self.used = 0
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BIRDList(self.val[which + "_heads"]).walk(self.count_heads_item)
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self.info[which + "_heads"] = self.hcnt
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self.info[which + "_used"] = self.used
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return (self.hcnt, self.used)
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def parse(self):
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self.page_size = gdb.lookup_symbol("page_size")[0].value()
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self.slheadtype = gdb.lookup_type("struct sl_head")
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self.info = {}
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self.count_heads("empty")
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self.count_heads("partial")
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self.count_heads("full")
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def memsize(self):
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if self.info is None:
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self.parse()
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total_used = self.info["empty_used"] + self.info["partial_used"] + self.info["full_used"]
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total_heads = self.info["empty_heads"] + self.info["partial_heads"] + self.info["full_heads"]
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eff_size = total_used * self.val["obj_size"]
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free_size = self.info["empty_heads"] * self.page_size
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total_size = total_heads * self.page_size + self.slabtype.sizeof
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return BIRDResourceSize( eff_size, total_size - free_size - eff_size, free_size)
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def __str__(self):
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if self.info is None:
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self.parse()
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return f"Slab {self.val.address} " + ", ".join([
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f"{self.info[x + '_heads']} {x} heads" for x in [ "empty", "partial", "full" ]]) + \
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f", {self.val['objs_per_slab']} objects of size {self.val['obj_size']} per head"
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class BIRDPoolResource(BIRDResource):
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def __init__(self, val):
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self.pooltype = gdb.lookup_type("struct pool")
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self.resptrtype = gdb.lookup_type("struct resource").pointer()
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self.page_size = gdb.lookup_symbol("page_size")[0].value()
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self.val = val.cast(self.pooltype)
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self.items = None
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def parse_inside(self, val):
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self.items.append(BIRDNewResource(val.cast(self.resptrtype).dereference()))
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def parse(self):
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self.items = []
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BIRDList(self.val["inside"]).walk(self.parse_inside)
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def memsize(self):
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if self.items is None:
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self.parse()
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sum = BIRDResourceSize(0, self.pooltype.sizeof, 0)
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# for i in self.items:
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# sum += i.memsize()
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return sum
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def __str__(self):
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if self.items is None:
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self.parse()
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# for i in self.items:
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# print(i)
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return f"Resource pool {self.val.address} \"{self.val['name'].string()}\" containing {len(self.items)} items"
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BIRDResourceMap = {
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"mbl_memsize": BIRDMBResource,
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"pool_memsize": BIRDPoolResource,
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"lp_memsize": BIRDLinPoolResource,
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"slab_memsize": BIRDSlabResource,
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}
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def BIRDNewResource(res):
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cms = res["class"].dereference()["memsize"]
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for cx in BIRDResourceMap:
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if cms == gdb.lookup_symbol(cx)[0].value():
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return BIRDResourceMap[cx](res)
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return BIRDResource(res)
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class BIRDResourcePrinter(BIRDPrinter):
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"Print BIRD's resource"
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typeCode = gdb.TYPE_CODE_STRUCT
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typeTag = "resource"
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def __init__(self, val):
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super(BIRDResourcePrinter, self).__init__(val)
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self.resource = BIRDNewResource(val)
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self.resource.parse()
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self.resourcetype = gdb.lookup_type("struct resource")
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if type(self.resource) == BIRDPoolResource:
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self.children = self.pool_children
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def pool_children(self):
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return iter([ ("\n", i.val.cast(self.resourcetype)) for i in self.resource.items ])
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def to_string(self):
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return f"[ {str(self.resource.memsize())} ] {str(self.resource)}"
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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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objfile.pretty_printers.append(BIRDResourcePrinter.lookup)
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register_printers(gdb.current_objfile())
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print("BIRD pretty printers loaded OK.")
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