1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
#
# Author: Zoltan Varga (vargaz@gmail.com)
# License: MIT/X11
#
#
# This is a mono support mode for gdb 7.0 and later
# Usage:
# - copy/symlink this file to the directory where the mono executable lives.
# - run mono under gdb, or attach to a mono process started with --debug=gdb using gdb.
#
import os
class StringPrinter:
"Print a C# string"
def __init__(self, val):
self.val = val
def to_string(self):
if int(self.val.cast (gdb.lookup_type ("guint64"))) == 0:
return "null"
obj = self.val.cast (gdb.lookup_type ("MonoString").pointer ()).dereference ()
len = obj ['length']
chars = obj ['chars']
i = 0
res = ['"']
while i < len:
val = (chars.cast(gdb.lookup_type ("gint64")) + (i * 2)).cast(gdb.lookup_type ("gunichar2").pointer ()).dereference ()
if val >= 256:
c = "\u%X" % val
else:
c = chr (val)
res.append (c)
i = i + 1
res.append ('"')
return ''.join (res)
def stringify_class_name(ns, name):
if ns == "System":
if name == "Byte":
return "byte"
if name == "String":
return "string"
if ns == "":
return name
else:
return "%s.%s" % (ns, name)
class ArrayPrinter:
"Print a C# array"
def __init__(self, val, class_ns, class_name):
self.val = val
self.class_ns = class_ns
self.class_name = class_name
def to_string(self):
obj = self.val.cast (gdb.lookup_type ("MonoArray").pointer ()).dereference ()
length = obj ['max_length']
return "%s [%d]" % (stringify_class_name (self.class_ns, self.class_name [0:len(self.class_name) - 2]), int(length))
class ObjectPrinter:
"Print a C# object"
def __init__(self, val):
if str(val.type)[-1] == "&":
self.val = val.address.cast (gdb.lookup_type ("MonoObject").pointer ())
else:
self.val = val.cast (gdb.lookup_type ("MonoObject").pointer ())
class _iterator:
def __init__(self,obj):
self.obj = obj
self.iter = self.obj.type.fields ().__iter__ ()
pass
def __iter__(self):
return self
def next(self):
field = self.iter.next ()
try:
if str(self.obj [field.name].type) == "object":
# Avoid recursion
return (field.name, self.obj [field.name].cast (gdb.lookup_type ("void").pointer ()))
else:
return (field.name, self.obj [field.name])
except:
# Superclass
return (field.name, self.obj.cast (gdb.lookup_type ("%s" % (field.name))))
def children(self):
# FIXME: It would be easier if gdb.Value would support iteration itself
# It would also be better if we could return None
if int(self.val.cast (gdb.lookup_type ("guint64"))) == 0:
return {}.__iter__ ()
try:
obj = self.val.dereference ()
class_ns = obj ['vtable'].dereference ()['klass'].dereference ()['name_space'].string ()
class_name = obj ['vtable'].dereference ()['klass'].dereference ()['name'].string ()
if class_name [-2:len(class_name)] == "[]":
return {}.__iter__ ()
gdb_type = gdb.lookup_type ("struct %s_%s" % (class_ns.replace (".", "_"), class_name))
return self._iterator(obj.cast (gdb_type))
except:
print sys.exc_info ()[0]
print sys.exc_info ()[1]
return {}.__iter__ ()
def to_string(self):
if int(self.val.cast (gdb.lookup_type ("guint64"))) == 0:
return "null"
try:
obj = self.val.dereference ()
class_ns = obj ['vtable'].dereference ()['klass'].dereference ()['name_space'].string ()
class_name = obj ['vtable'].dereference ()['klass'].dereference ()['name'].string ()
if class_ns == "System" and class_name == "String":
return StringPrinter (self.val).to_string ()
if class_name [-2:len(class_name)] == "[]":
return ArrayPrinter (self.val,class_ns,class_name).to_string ()
if class_ns != "":
try:
gdb_type = gdb.lookup_type ("struct %s.%s" % (class_ns, class_name))
except:
# Maybe there is no debug info for that type
return "%s.%s" % (class_ns, class_name)
#return obj.cast (gdb_type)
return "%s.%s" % (class_ns, class_name)
return class_name
except:
print sys.exc_info ()[0]
print sys.exc_info ()[1]
# FIXME: This can happen because we don't have liveness information
return self.val.cast (gdb.lookup_type ("guint64"))
class MonoMethodPrinter:
"Print a MonoMethod structure"
def __init__(self, val):
self.val = val
def to_string(self):
if int(self.val.cast (gdb.lookup_type ("guint64"))) == 0:
return "0x0"
val = self.val.dereference ()
klass = val ["klass"].dereference ()
class_name = stringify_class_name (klass ["name_space"].string (), klass ["name"].string ())
return "\"%s:%s ()\"" % (class_name, val ["name"].string ())
# This returns more info but requires calling into the inferior
#return "\"%s\"" % (gdb.parse_and_eval ("mono_method_full_name (%s, 1)" % (str (int (self.val.cast (gdb.lookup_type ("guint64")))))).string ())
class MonoClassPrinter:
"Print a MonoClass structure"
def __init__(self, val):
self.val = val
def to_string(self):
if int(self.val.cast (gdb.lookup_type ("guint64"))) == 0:
return "0x0"
klass = self.val.dereference ()
class_name = stringify_class_name (klass ["name_space"].string (), klass ["name"].string ())
return "\"%s\"" % (class_name)
# This returns more info but requires calling into the inferior
#return "\"%s\"" % (gdb.parse_and_eval ("mono_type_full_name (&((MonoClass*)%s)->byval_arg)" % (str (int ((self.val).cast (gdb.lookup_type ("guint64")))))))
def lookup_pretty_printer(val):
t = str (val.type)
if t == "object":
return ObjectPrinter (val)
if t[0:5] == "class" and t[-1] == "&":
return ObjectPrinter (val)
if t == "string":
return StringPrinter (val)
if t == "MonoMethod *":
return MonoMethodPrinter (val)
if t == "MonoClass *":
return MonoClassPrinter (val)
return None
def register_csharp_printers(obj):
"Register C# pretty-printers with objfile Obj."
if obj == None:
obj = gdb
obj.pretty_printers.append (lookup_pretty_printer)
register_csharp_printers (gdb.current_objfile())
gdb.execute ("set environment MONO_XDEBUG gdb")
print "Mono support loaded."
|
