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# -*- ksh -*-
#
# 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
# $1 = void
# (gdb)
# Prints a representation of the object to stderr, along with the
# number of reference counts it current has and the hex address the
# object is allocated at. The argument must be a PyObject*
define pyo
print _PyObject_Dump($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_nlocals
if f->f_localsplus + $_i != 0
set $_names = co->co_varnames
set $_name = PyString_AsString(PyTuple_GetItem($_names, $_i))
printf "%s:\n", $_name
# side effect of calling _PyObject_Dump is to dump the object's
# info - assigning just prevents gdb from printing the
# NULL return value
set $_val = _PyObject_Dump(f->f_localsplus[$_i])
end
set $_i = $_i + 1
end
end
# print the current frame
define pyframe
set $__fn = PyString_AsString(co->co_filename)
set $__n = PyString_AsString(co->co_name)
printf "%s (%d): %s\n", $__fn, f->f_lineno, $__n
pylocals
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 eval_frame().
# 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
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