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
|
# If you use the GNU debugger gdb to debug the Python C runtime, you
# might find some of the following commands useful. Copy this to your
# ~/.gdbinit file and it'll get loaded into gdb automatically when you
# start it up. Then, at the gdb prompt you can do things like:
#
# (gdb) pyo apyobjectptr
# <module 'foobar' (built-in)>
# refcounts: 1
# address : 84a7a2c
# $1 = void
# (gdb)
#
# NOTE: If you have gdb 7 or later, it supports debugging of Python directly
# with embedded macros that you may find superior to what is in here.
# See https://fedoraproject.org/wiki/Features/EasierPythonDebugging
# and http://bugs.python.org/issue8032 for more gdb 7 python information.
# Prints a representation of the object to stderr, along with the
# number of reference counts it current has and the hex address the
# object is allocated at. The argument must be a PyObject*
define pyo
# side effect of calling _PyObject_Dump is to dump the object's
# info - assigning just prevents gdb from printing the
# NULL return value
set $_unused_void = _PyObject_Dump($arg0)
end
# Prints a representation of the object to stderr, along with the
# number of reference counts it current has and the hex address the
# object is allocated at. The argument must be a PyGC_Head*
define pyg
print _PyGC_Dump($arg0)
end
# print the local variables of the current frame
define pylocals
set $_i = 0
while $_i < f->f_code->co_nlocals
if f->f_localsplus + $_i != 0
set $_names = co->co_varnames
set $_name = _PyUnicode_AsString(PyTuple_GetItem($_names, $_i))
printf "%s:\n", $_name
pyo f->f_localsplus[$_i]
end
set $_i = $_i + 1
end
end
# A rewrite of the Python interpreter's line number calculator in GDB's
# command language
define lineno
set $__continue = 1
set $__co = f->f_code
set $__lasti = f->f_lasti
set $__sz = ((PyVarObject *)$__co->co_lnotab)->ob_size/2
set $__p = (unsigned char *)((PyBytesObject *)$__co->co_lnotab)->ob_sval
set $__li = $__co->co_firstlineno
set $__ad = 0
while ($__sz-1 >= 0 && $__continue)
set $__sz = $__sz - 1
set $__ad = $__ad + *$__p
set $__p = $__p + 1
if ($__ad > $__lasti)
set $__continue = 0
end
set $__li = $__li + *$__p
set $__p = $__p + 1
end
printf "%d", $__li
end
# print the current frame - verbose
define pyframev
pyframe
pylocals
end
define pyframe
set $__fn = _PyUnicode_AsString(co->co_filename)
set $__n = _PyUnicode_AsString(co->co_name)
printf "%s (", $__fn
lineno
printf "): %s\n", $__n
### Uncomment these lines when using from within Emacs/XEmacs so it will
### automatically track/display the current Python source line
# printf "%c%c%s:", 032, 032, $__fn
# lineno
# printf ":1\n"
end
### Use these at your own risk. It appears that a bug in gdb causes it
### to crash in certain circumstances.
#define up
# up-silently 1
# printframe
#end
#define down
# down-silently 1
# printframe
#end
define printframe
if $pc > PyEval_EvalFrameEx && $pc < PyEval_EvalCodeEx
pyframe
else
frame
end
end
# Here's a somewhat fragile way to print the entire Python stack from gdb.
# It's fragile because the tests for the value of $pc depend on the layout
# of specific functions in the C source code.
# Explanation of while and if tests: We want to pop up the stack until we
# land in Py_Main (this is probably an incorrect assumption in an embedded
# interpreter, but the test can be extended by an interested party). If
# Py_Main <= $pc <= Py_GetArgcArv is true, $pc is in Py_Main(), so the while
# tests succeeds as long as it's not true. In a similar fashion the if
# statement tests to see if we are in PyEval_EvalFrame().
# print the entire Python call stack
define pystack
while $pc < Py_Main || $pc > Py_GetArgcArgv
if $pc > PyEval_EvalFrame && $pc < PyEval_EvalCodeEx
pyframe
end
up-silently 1
end
select-frame 0
end
# print the entire Python call stack - verbose mode
define pystackv
while $pc < Py_Main || $pc > Py_GetArgcArgv
if $pc > PyEval_EvalFrame && $pc < PyEval_EvalCodeEx
pyframev
end
up-silently 1
end
select-frame 0
end
# generally useful macro to print a Unicode string
def pu
set $uni = $arg0
set $i = 0
while (*$uni && $i++<100)
if (*$uni < 0x80)
print *(char*)$uni++
else
print /x *(short*)$uni++
end
end
end
|
