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gdbinit
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# 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 Tools/gdb/libpython.py and http://bugs.python.org/issue8032.
# 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
else
set $__li = $__li + *$__p
set $__p = $__p + 1
end
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_EvalFrameEx().
# Note: The name of the main interpreter function and the function which
# follow it has changed over time. This version of pystack works with this
# version of Python. If you try using it with older or newer versions of
# the interpreter you may will have to change the functions you compare with
# $pc.
# print the entire Python call stack
define pystack
while $pc < Py_Main || $pc > Py_GetArgcArgv
if $pc > PyEval_EvalFrameEx && $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_EvalFrameEx && $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