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annotate Python/makeopcodetargets.py @ 78758:ca4bf8e10bc0

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Issue #15316: Let exceptions raised during imports triggered by the fromlist of __import__ propagate. The problem previously was that if something listed in fromlist didn't exist then that's okay. The fix for that was too broad in terms of catching ImportError. The trick with the solution to this issue is that the proper refactoring of import thanks to importlib doesn't allow for a way to distinguish (portably) between an ImportError because finders couldn't find a loader, or a loader raised the exception. In Python 3.4 the hope is to introduce a new exception (e.g. ModuleNotFound) to make it clean to differentiate why ImportError was raised.
author Brett Cannon <brett@python.org>
date Fri, 24 Aug 2012 18:25:59 -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()