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75 lines
2.4 KiB
Plaintext
75 lines
2.4 KiB
Plaintext
# -*- ksh -*-
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#
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# If you use the GNU debugger gdb to debug the Python C runtime, you
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# might find some of the following commands useful. Copy this to your
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# ~/.gdbinit file and it'll get loaded into gdb automatically when you
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# start it up. Then, at the gdb prompt you can do things like:
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#
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# (gdb) pyo apyobjectptr
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# <module 'foobar' (built-in)>
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# refcounts: 1
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# address : 84a7a2c
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# $1 = void
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# (gdb)
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# Prints a representation of the object to stderr, along with the
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# number of reference counts it current has and the hex address the
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# object is allocated at. The argument must be a PyObject*
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define pyo
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print _PyObject_Dump($arg0)
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end
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# Prints a representation of the object to stderr, along with the
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# number of reference counts it current has and the hex address the
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# object is allocated at. The argument must be a PyGC_Head*
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define pyg
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print _PyGC_Dump($arg0)
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end
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# print the local variables of the current frame
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define pylocals
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set $_i = 0
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while $_i < f->f_nlocals
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if f->f_localsplus + $_i != 0
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set $_names = co->co_varnames
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set $_name = PyString_AsString(PyTuple_GetItem($_names, $_i))
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printf "%s:\n", $_name
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# side effect of calling _PyObject_Dump is to dump the object's
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# info - assigning just prevents gdb from printing the
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# NULL return value
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set $_val = _PyObject_Dump(f->f_localsplus[$_i])
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end
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set $_i = $_i + 1
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end
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end
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# print the current frame
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define pyframe
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set $__fn = PyString_AsString(co->co_filename)
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set $__n = PyString_AsString(co->co_name)
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printf "%s (%d): %s\n", $__fn, f->f_lineno, $__n
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pylocals
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end
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# Here's a somewhat fragile way to print the entire Python stack from gdb.
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# It's fragile because the tests for the value of $pc depend on the layout
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# of specific functions in the C source code.
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# Explanation of while and if tests: We want to pop up the stack until we
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# land in Py_Main (this is probably an incorrect assumption in an embedded
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# interpreter, but the test can be extended by an interested party). If
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# Py_Main <= $pc <= Py_GetArgcArv is true, $pc is in Py_Main(), so the while
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# tests succeeds as long as it's not true. In a similar fashion the if
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# statement tests to see if we are in eval_frame().
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# print the entire Python call stack
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define pystack
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while $pc < Py_Main || $pc > Py_GetArgcArgv
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if $pc > eval_frame && $pc < PyEval_EvalCodeEx
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pyframe
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end
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up-silently 1
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end
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select-frame 0
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end
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