Mercurial > cpython-lru_cache-weakref

annotate Python/makeopcodetargets.py @ 86823:17d730d37b2f

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Issue #19410: Put back in special-casing of '' for importlib.machinery.FileFinder. While originally moved to stop special-casing '' as PathFinder farther up the typical call chain now uses the cwd in the instance of '', it was deemed an unnecessary risk to breaking subclasses of FileFinder to take the special-casing out.
author Brett Cannon <brett@python.org>
date Fri, 01 Nov 2013 10:37:57 -0400
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()