# 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ドル = 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 = f->f_code->co_varnames
	 set $_name = PyUnicode_AsUTF8(PyTuple_GetItem($_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_AsUTF8(f->f_code->co_filename)
 set $__n = PyUnicode_AsUTF8(f->f_code->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_EvalFrameDefault
	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_EvalFrameDefault
	 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_EvalFrameDefault
	 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