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annotate Python/makeopcodetargets.py @ 81432:a4292889e942

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Issue #15031: Refactor some code in importlib pertaining to validating and compiling bytecode. Thanks to Ronan Lamy for pointing the redundancy and taking an initial stab at the refactor (as did Nick Coghlan).
author Brett Cannon <brett@python.org>
date Fri, 11 Jan 2013 18:09:25 -0500
parents d30b54ffd5e8
children
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1 #! /usr/bin/env python
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2 """Generate C code for the jump table of the threaded code interpreter
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3 (for compilers supporting computed gotos or "labels-as-values", such as gcc).
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4 """
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5
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6 # This code should stay compatible with Python 2.3, at least while
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7 # some of the buildbots have Python 2.3 as their system Python.
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8
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9 import imp
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10 import os
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11
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12
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13 def find_module(modname):
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14 """Finds and returns a module in the local dist/checkout.
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15 """
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16 modpath = os.path.join(
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17 os.path.dirname(os.path.dirname(__file__)), "Lib")
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18 return imp.load_module(modname, *imp.find_module(modname, [modpath]))
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19
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20 def write_contents(f):
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21 """Write C code contents to the target file object.
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22 """
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23 opcode = find_module("opcode")
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24 targets = ['_unknown_opcode'] * 256
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25 for opname, op in opcode.opmap.items():
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26 targets[op] = "TARGET_%s" % opname
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27 f.write("static void *opcode_targets[256] = {\n")
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28 f.write(",\n".join([" &&%s" % s for s in targets]))
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29 f.write("\n};\n")
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30
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31
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32 if __name__ == "__main__":
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33 import sys
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34 assert len(sys.argv) < 3, "Too many arguments"
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35 if len(sys.argv) == 2:
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36 target = sys.argv[1]
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37 else:
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38 target = "Python/opcode_targets.h"
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39 f = open(target, "w")
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40 try:
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41 write_contents(f)
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42 finally:
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43 f.close()