bird-gdb.py

   1 class BIRDPrinter:
   2     def __init__(self, val):
   3         self.val = val
   4
   5     @classmethod
   6     def lookup(cls, val):
   7         if val.type.code != cls.typeCode:
   8             return None
   9         if val.type.tag != cls.typeTag:
  10             return None
  11
  12         return cls(val)
  13
  14
  15 class BIRDFValPrinter(BIRDPrinter):
  16     "Print BIRD\s struct f_val"
  17     typeCode = gdb.TYPE_CODE_STRUCT
  18     typeTag = "f_val"
  19
  20     codemap = {
  21             "T_INT": "i",
  22             "T_BOOL": "i",
  23             "T_PAIR": "i",
  24             "T_QUAD": "i",
  25             "T_ENUM_RTS": "i",
  26             "T_ENUM_BGP_ORIGIN": "i",
  27             "T_ENUM_SCOPE": "i",
  28             "T_ENUM_RTC": "i",
  29             "T_ENUM_RTD": "i",
  30             "T_ENUM_ROA": "i",
  31             "T_ENUM_NETTYPE": "i",
  32             "T_ENUM_RA_PREFERENCE": "i",
  33             "T_ENUM_AF": "i",
  34             "T_IP": "ip",
  35             "T_NET": "net",
  36             "T_STRING": "s",
  37             "T_PATH_MASK": "path_mask",
  38             "T_PATH": "ad",
  39             "T_CLIST": "ad",
  40             "T_EC": "ec",
  41             "T_ECLIST": "ad",
  42             "T_LC": "lc",
  43             "T_LCLIST": "ad",
  44             "T_RD": "ec",
  45             "T_PATH_MASK_ITEM": "pmi",
  46             "T_SET": "t",
  47             "T_PREFIX_SET": "ti",
  48             }
  49
  50     def to_string(self):
  51         code = self.val['type']
  52         if code.type.code != gdb.TYPE_CODE_ENUM or code.type.tag != "f_type":
  53             raise Exception("Strange 'type' element in f_val")
  54
  55         if str(code) == "T_VOID":
  56             return "T_VOID"
  57         else:
  58             return "(%(c)s) %(v)s" % { "c": code, "v": self.val['val'][self.codemap[str(code)]] }
  59
  60     def display_hint(self):
  61         return "map"
  62
  63 class BIRDFValStackPrinter(BIRDPrinter):
  64     "Print BIRD's struct f_val_stack"
  65     typeCode = gdb.TYPE_CODE_STRUCT
  66     typeTag = "f_val_stack"
  67
  68     def to_string(self):
  69         cnt = self.val['cnt']
  70         return ("Value stack (%(cnt)d):\n\t" % { "cnt": cnt }) + \
  71                 "\n\t".join([ (".val[%(n) 3d] = " % { "n": n}) + str(self.val['val'][n]) for n in range(cnt-1, -1, -1) ])
  72
  73     def display_hint(self):
  74         return "map"
  75
  76 class BIRDFInstPrinter(BIRDPrinter):
  77     "Print BIRD's struct f_inst"
  78     typeCode = gdb.TYPE_CODE_STRUCT
  79     typeTag = "f_inst"
  80
  81     def to_string(self):
  82         code = self.val['fi_code']
  83         if str(code) == "FI_NOP":
  84             return str(code) + ": " + str(self.val.cast(gdb.lookup_type("const char [%(siz)d]" % { "siz": self.val.type.sizeof })))
  85         return "%(code)s:\t%(lineno) 6dL\t%(size)6dS\tnext = %(next)s: .i_%(code)s = %(union)s" % {
  86                 "code": str(code),
  87                 "lineno": self.val['lineno'],
  88                 "size": self.val['size'],
  89                 "next": str(self.val['next']),
  90                 "union": str(self.val['i_' + str(code)])
  91                 }
  92
  93 # def children(self): # children iterator
  94     def display_hint(self):
  95         return "map"
  96
  97 class BIRDFLineItemPrinter(BIRDPrinter):
  98     "Print BIRD's struct f_line_item"
  99     typeCode = gdb.TYPE_CODE_STRUCT
 100     typeTag = "f_line_item"
 101
 102     def to_string(self):
 103         code = self.val['fi_code']
 104         if str(code) == "FI_NOP":
 105             return str(code) + ": " + str(self.val.cast(gdb.lookup_type("const char [%(siz)d]" % { "siz": self.val.type.sizeof })))
 106         return "%(code)s:\t%(lineno) 6dL\t%(flags)2dF: .i_%(code)s = %(union)s" % {
 107                 "code": str(code),
 108                 "lineno": self.val['lineno'],
 109                 "flags": self.val['flags'],
 110                 "union": str(self.val['i_' + str(code)])
 111                 }
 112
 113 class BIRDFLinePrinter(BIRDPrinter):
 114     "Print BIRD's struct f_line"
 115     typeCode = gdb.TYPE_CODE_STRUCT
 116     typeTag = "f_line"
 117
 118     def to_string(self):
 119         cnt = self.val['len']
 120         return ("FLine (%(cnt)d, args=%(args)d): " % { "cnt": cnt, "args" : self.val['args'] } + \
 121                 ", ".join([
 122                     ".items[%(n) 3d] = %(code)s" % {
 123                         "n": n,
 124                         "code": str(self.val['items'][n]['fi_code']),
 125                     } if n % 8 == 0 else str(self.val['items'][n]['fi_code']) for n in range(cnt)]))
 126
 127
 128 class BIRDFExecStackPrinter(BIRDPrinter):
 129     "Print BIRD's struct f_exec_stack"
 130     typeCode = gdb.TYPE_CODE_STRUCT
 131     typeTag = "f_exec_stack"
 132
 133     def to_string(self):
 134         cnt = self.val['cnt']
 135         return ("Exec stack (%(cnt)d):\n\t" % { "cnt": cnt }) + \
 136                 "\n\t".join([ ".item[%(n) 3d] = %(retflag)d V%(ventry) 3d P%(pos) 4d %(line)s" % {
 137                     "retflag": self.val['item'][n]['emask'],
 138                     "ventry": self.val['item'][n]['ventry'],
 139                     "pos": self.val['item'][n]['pos'],
 140                     "line": str(self.val['item'][n]['line'].dereference()),
 141                     "n": n
 142                         } for n in range(cnt-1, -1, -1) ])
 143
 144 def register_printers(objfile):
 145     objfile.pretty_printers.append(BIRDFInstPrinter.lookup)
 146     objfile.pretty_printers.append(BIRDFValPrinter.lookup)
 147     objfile.pretty_printers.append(BIRDFValStackPrinter.lookup)
 148     objfile.pretty_printers.append(BIRDFLineItemPrinter.lookup)
 149     objfile.pretty_printers.append(BIRDFLinePrinter.lookup)
 150     objfile.pretty_printers.append(BIRDFExecStackPrinter.lookup)
 151
 152 register_printers(gdb.current_objfile())
 153
 154 print("BIRD pretty printers loaded OK.")