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
| """
LLDB AppKit formatters
Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
See https://llvm.org/LICENSE.txt for license information.
SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
"""
# example summary provider for NSData
# the real summary is now C++ code built into LLDB
import lldb
import ctypes
import lldb.runtime.objc.objc_runtime
import lldb.formatters.metrics
import lldb.formatters.Logger
try:
basestring
except NameError:
basestring = str
statistics = lldb.formatters.metrics.Metrics()
statistics.add_metric('invalid_isa')
statistics.add_metric('invalid_pointer')
statistics.add_metric('unknown_class')
statistics.add_metric('code_notrun')
# despite the similary to synthetic children providers, these classes are not
# trying to provide anything but the length for an NSData, so they need not
# obey the interface specification for synthetic children providers
class NSConcreteData_SummaryProvider:
def adjust_for_architecture(self):
pass
def __init__(self, valobj, params):
logger = lldb.formatters.Logger.Logger()
logger >> "NSConcreteData_SummaryProvider __init__"
self.valobj = valobj
self.sys_params = params
if not(self.sys_params.types_cache.NSUInteger):
if self.sys_params.is_64_bit:
self.sys_params.types_cache.NSUInteger = self.valobj.GetType(
).GetBasicType(lldb.eBasicTypeUnsignedLong)
else:
self.sys_params.types_cache.NSUInteger = self.valobj.GetType(
).GetBasicType(lldb.eBasicTypeUnsignedInt)
self.update()
def update(self):
self.adjust_for_architecture()
# one pointer is the ISA
# then there are 32 bit worth of flags and other data
# however, on 64bit systems these are padded to be a full
# machine word long, which means we actually have two pointers
# worth of data to skip
def offset(self):
return 2 * self.sys_params.pointer_size
def length(self):
logger = lldb.formatters.Logger.Logger()
logger >> "NSConcreteData_SummaryProvider length"
size = self.valobj.CreateChildAtOffset(
"count", self.offset(), self.sys_params.types_cache.NSUInteger)
logger >> str(size)
logger >> str(size.GetValueAsUnsigned(0))
return size.GetValueAsUnsigned(0)
class NSDataUnknown_SummaryProvider:
def adjust_for_architecture(self):
pass
def __init__(self, valobj, params):
logger = lldb.formatters.Logger.Logger()
logger >> "NSDataUnknown_SummaryProvider __init__"
self.valobj = valobj
self.sys_params = params
self.update()
def update(self):
self.adjust_for_architecture()
def length(self):
logger = lldb.formatters.Logger.Logger()
logger >> "NSDataUnknown_SummaryProvider length"
stream = lldb.SBStream()
self.valobj.GetExpressionPath(stream)
logger >> stream.GetData()
num_children_vo = self.valobj.CreateValueFromExpression(
"count", "(int)[" + stream.GetData() + " length]")
logger >> "still in after expression: " + str(num_children_vo)
if num_children_vo.IsValid():
logger >> "wow - expr output is valid: " + \
str(num_children_vo.GetValueAsUnsigned())
return num_children_vo.GetValueAsUnsigned(0)
logger >> "invalid expr output - too bad"
return '<variable is not NSData>'
def GetSummary_Impl(valobj):
global statistics
logger = lldb.formatters.Logger.Logger()
logger >> "NSData GetSummary_Impl"
class_data, wrapper = lldb.runtime.objc.objc_runtime.Utilities.prepare_class_detection(
valobj, statistics)
if wrapper:
logger >> "got a wrapper summary - using it"
return wrapper
name_string = class_data.class_name()
logger >> "class name: " + name_string
if name_string == 'NSConcreteData' or \
name_string == 'NSConcreteMutableData' or \
name_string == '__NSCFData':
wrapper = NSConcreteData_SummaryProvider(valobj, class_data.sys_params)
statistics.metric_hit('code_notrun', valobj)
else:
wrapper = NSDataUnknown_SummaryProvider(valobj, class_data.sys_params)
statistics.metric_hit(
'unknown_class',
valobj.GetName() +
" seen as " +
name_string)
return wrapper
def NSData_SummaryProvider(valobj, dict):
logger = lldb.formatters.Logger.Logger()
logger >> "NSData_SummaryProvider"
provider = GetSummary_Impl(valobj)
logger >> "found a summary provider, it is: " + str(provider)
if provider is not None:
try:
summary = provider.length()
except:
summary = None
logger >> "got a summary: it is " + str(summary)
if summary is None:
summary = '<variable is not NSData>'
elif isinstance(summary, basestring):
pass
else:
if summary == 1:
summary = '1 byte'
else:
summary = str(summary) + ' bytes'
return summary
return 'Summary Unavailable'
def NSData_SummaryProvider2(valobj, dict):
logger = lldb.formatters.Logger.Logger()
logger >> "NSData_SummaryProvider2"
provider = GetSummary_Impl(valobj)
logger >> "found a summary provider, it is: " + str(provider)
if provider is not None:
if isinstance(
provider,
lldb.runtime.objc.objc_runtime.SpecialSituation_Description):
return provider.message()
try:
summary = provider.length()
except:
summary = None
logger >> "got a summary: it is " + str(summary)
if summary is None:
summary = '<variable is not CFData>'
elif isinstance(summary, basestring):
pass
else:
if summary == 1:
summary = '@"1 byte"'
else:
summary = '@"' + str(summary) + ' bytes"'
return summary
return 'Summary Unavailable'
def __lldb_init_module(debugger, dict):
debugger.HandleCommand(
"type summary add -F NSData.NSData_SummaryProvider NSData")
debugger.HandleCommand(
"type summary add -F NSData.NSData_SummaryProvider2 CFDataRef CFMutableDataRef")
|