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107 lines
2.4 KiB
Python
107 lines
2.4 KiB
Python
#!/usr/bin/env python
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# This file is Copyright 2003, 2006, 2007, 2009, 2010 Dean Hall.
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#
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# This file is part of the Python-on-a-Chip program.
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# Python-on-a-Chip is free software: you can redistribute it and/or modify
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# it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE Version 2.1.
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#
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# Python-on-a-Chip is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# A copy of the GNU LESSER GENERAL PUBLIC LICENSE Version 2.1
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# is seen in the file COPYING in this directory.
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"""
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Python Byte Code utility functions.
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count(fn) - count the number of times each byte code
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appears in a code object.
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"""
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## @file
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# @copybrief bcode
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## @package bcode
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# @brief Python Byte Code utility functions.
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#
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# count(fn) - count the number of times each byte code
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# appears in a code object.
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import dis, types
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#The highest numbered byte code
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MAX_BCODE = 150
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def count(fn):
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"""
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Compile the python source file named fn.
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Count all the bytecodes in the file.
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Return a list of counts indexed by bcode.
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"""
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#create a code object
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src = open(fn).read()
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co = compile(src, fn, "exec")
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#init list
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cnt = [0,] * MAX_BCODE
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#iterate through the nested code objects
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_rcount(co, cnt)
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return cnt
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def _rcount(co, count):
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"""
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Recursively descend through all the code objects
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in the given code object, co.
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Add byte code counts to the count dict.
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"""
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#current byte code string
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str = co.co_code
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strlen = len(str)
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#count byte codes in current string
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i = 0
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while i < strlen:
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bcode = ord(str[i])
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i += 1
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#incr count
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count[bcode] += 1
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#if bcode has arg, incr ptr by 2 bytes
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if bcode >= 90:
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i += 2
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#count code objects in constant pool
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for obj in co.co_consts:
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if type(obj) == types.CodeType:
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_rcount(obj, count)
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return
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def main(fn):
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"""
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Count the bytecodes in the file, fn,
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and print them out in human-readable form.
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"""
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#count the bytecodes in this file
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c = count(fn)
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#print bcode name and count
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for i in range(len(c)):
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if c[i]:
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print dis.opname[i], ":\t", c[i]
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return
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if __name__ == "__main__":
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main("c:\\dwh\\tech\\cis\\py\\snap.py")
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