glib/glib.py

   1 import gdb
   2
   3 # This is not quite right, as local vars may override symname
   4 def read_global_var (symname):
   5     return gdb.selected_frame().read_var(symname)
   6
   7 def g_quark_to_string (quark):
   8     if quark == None:
   9         return None
  10     quark = long(quark)
  11     if quark == 0:
  12         return None
  13     val = read_global_var ("g_quarks")
  14     max_q = long(read_global_var ("g_quark_seq_id"))
  15     if quark < max_q:
  16         return val[quark].string()
  17     return None
  18
  19 # We override the node printers too, so that node->next is not expanded
  20 class GListNodePrinter:
  21     "Prints a GList node"
  22
  23     def __init__ (self, val):
  24         self.val = val
  25
  26     def to_string (self):
  27         return "{data=%s, next=0x%x, prev=0x%x}" % (str(self.val["data"]), long(self.val["next"]), long(self.val["prev"]))
  28
  29 class GSListNodePrinter:
  30     "Prints a GSList node"
  31
  32     def __init__ (self, val):
  33         self.val = val
  34
  35     def to_string (self):
  36         return "{data=%s, next=0x%x}" % (str(self.val["data"]), long(self.val["next"]))
  37
  38 class GListPrinter:
  39     "Prints a GList"
  40
  41     class _iterator:
  42         def __init__(self, head, listtype):
  43             self.link = head
  44             self.listtype = listtype
  45             self.count = 0
  46
  47         def __iter__(self):
  48             return self
  49
  50         def next(self):
  51             if self.link == 0:
  52                 raise StopIteration
  53             data = self.link['data']
  54             self.link = self.link['next']
  55             count = self.count
  56             self.count = self.count + 1
  57             return ('[%d]' % count, data)
  58
  59     def __init__ (self, val, listtype):
  60         self.val = val
  61         self.listtype = listtype
  62
  63     def children(self):
  64         return self._iterator(self.val, self.listtype)
  65
  66     def to_string (self):
  67         return  "0x%x" % (long(self.val))
  68
  69     def display_hint (self):
  70         return "array"
  71
  72 class GHashPrinter:
  73     "Prints a GHashTable"
  74
  75     class _iterator:
  76         def __init__(self, ht, keys_are_strings):
  77             self.ht = ht
  78             if ht != 0:
  79                 self.array = ht["nodes"]
  80                 self.size = ht["size"]
  81             self.pos = 0
  82             self.keys_are_strings = keys_are_strings
  83             self.value = None
  84
  85         def __iter__(self):
  86             return self
  87
  88         def next(self):
  89             if self.ht == 0:
  90                 raise StopIteration
  91             if self.value != None:
  92                 v = self.value
  93                 self.value = None
  94                 return v
  95             while long(self.pos) < long(self.size):
  96                 node = self.array[self.pos]
  97                 self.pos = self.pos + 1
  98                 if long (node["key_hash"]) >= 2:
  99                     key = node["key"]
 100                     val = node["value"]
 101
 102                     if self.keys_are_strings:
 103                         key = key.cast (gdb.lookup_type("char").pointer())
 104
 105                     # Queue value for next result
 106                     self.value = ('[%dv]'% (self.pos), val)
 107
 108                     # Return key
 109                     return ('[%dk]'% (self.pos), key)
 110             raise StopIteration
 111
 112     def __init__ (self, val):
 113         self.val = val
 114         self.keys_are_strings = False
 115         try:
 116             string_hash = read_global_var ("g_str_hash")
 117         except:
 118             try:
 119                 string_hash = read_global_var ("IA__g_str_hash")
 120             except:
 121                 string_hash = None
 122         if self.val != 0 and string_hash != None and self.val["hash_func"] == string_hash:
 123             self.keys_are_strings = True
 124
 125     def children(self):
 126         return self._iterator(self.val, self.keys_are_strings)
 127
 128     def to_string (self):
 129         return  "0x%x" % (long(self.val))
 130
 131     def display_hint (self):
 132         return "map"
 133
 134 def pretty_printer_lookup (val):
 135     if is_g_type_instance (val):
 136         return GTypePrettyPrinter (val)
 137
 138 def pretty_printer_lookup (val):
 139     # None yet, want things like hash table and list
 140
 141     type = val.type.unqualified()
 142
 143     # If it points to a reference, get the reference.
 144     if type.code == gdb.TYPE_CODE_REF:
 145         type = type.target ()
 146
 147     if type.code == gdb.TYPE_CODE_PTR:
 148         type = type.target().unqualified()
 149         t = str(type)
 150         if t == "GList":
 151             return GListPrinter(val, "GList")
 152         if t == "GSList":
 153             return GListPrinter(val, "GSList")
 154         if t == "GHashTable":
 155             return GHashPrinter(val)
 156     else:
 157         t = str(type)
 158         if t == "GList":
 159             return GListNodePrinter(val)
 160         if t == "GSList *":
 161             return GListPrinter(val, "GSList")
 162     return None
 163
 164 def register (obj):
 165     if obj == None:
 166         obj = gdb
 167
 168     obj.pretty_printers.append(pretty_printer_lookup)
 169
 170 class ForeachCommand (gdb.Command):
 171     """Foreach on list"""
 172
 173     def __init__ (self):
 174         super (ForeachCommand, self).__init__ ("gforeach",
 175                                                gdb.COMMAND_DATA,
 176                                                gdb.COMPLETE_SYMBOL)
 177
 178     def valid_name (self, name):
 179         if not name[0].isalpha():
 180             return False
 181         return True
 182
 183     def parse_args (self, arg):
 184         i = arg.find(" ")
 185         if i <= 0:
 186             raise Exception ("No var specified")
 187         var = arg[:i]
 188         if not self.valid_name(var):
 189             raise Exception ("Invalid variable name")
 190
 191         while i < len (arg) and arg[i].isspace():
 192             i = i + 1
 193
 194         if arg[i:i+2] != "in":
 195             raise Exception ("Invalid syntax, missing in")
 196
 197         i = i + 2
 198
 199         while i < len (arg) and arg[i].isspace():
 200             i = i + 1
 201
 202         colon = arg.find (":", i)
 203         if colon == -1:
 204             raise Exception ("Invalid syntax, missing colon")
 205
 206         val = arg[i:colon]
 207
 208         colon = colon + 1
 209         while colon < len (arg) and arg[colon].isspace():
 210             colon = colon + 1
 211
 212         command = arg[colon:]
 213
 214         return (var, val, command)
 215
 216     def do_iter(self, arg, item, command):
 217         item = item.cast (gdb.lookup_type("void").pointer())
 218         item = long(item)
 219         to_eval = "set $%s = (void *)0x%x\n"%(arg, item)
 220         gdb.execute(to_eval)
 221         gdb.execute(command)
 222
 223     def slist_iterator (self, arg, container, command):
 224         l = container.cast (gdb.lookup_type("GSList").pointer())
 225         while long(l) != 0:
 226             self.do_iter (arg, l["data"], command)
 227             l = l["next"]
 228
 229     def list_iterator (self, arg, container, command):
 230         l = container.cast (gdb.lookup_type("GList").pointer())
 231         while long(l) != 0:
 232             self.do_iter (arg, l["data"], command)
 233             l = l["next"]
 234
 235     def pick_iterator (self, container):
 236         t = container.type.unqualified()
 237         if t.code == gdb.TYPE_CODE_PTR:
 238             t = t.target().unqualified()
 239             t = str(t)
 240             if t == "GSList":
 241                 return self.slist_iterator
 242             if t == "GList":
 243                 return self.list_iterator
 244         raise Exception("Invalid container type %s"%(str(container.type)))
 245
 246     def invoke (self, arg, from_tty):
 247         (var, container, command) = self.parse_args(arg)
 248         container = gdb.parse_and_eval (container)
 249         func = self.pick_iterator(container)
 250         func(var, container, command)
 251
 252 ForeachCommand ()