mirror of https://github.com/python/cpython
44 lines
1.2 KiB
Python
44 lines
1.2 KiB
Python
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#! /usr/bin/env python
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"""Generate C code for the jump table of the threaded code interpreter
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(for compilers supporting computed gotos or "labels-as-values", such as gcc).
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"""
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import imp
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import os
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def find_module(modname):
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"""Finds and returns a module in the local dist/checkout.
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"""
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modpath = os.path.join(
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os.path.dirname(os.path.dirname(__file__)), "Lib")
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return imp.load_module(modname, *imp.find_module(modname, [modpath]))
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def write_contents(f):
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"""Write C code contents to the target file object.
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"""
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opcode = find_module("opcode")
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targets = ['_unknown_opcode'] * 256
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for opname, op in opcode.opmap.items():
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if opname == "STOP_CODE":
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# XXX opcode not implemented
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continue
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targets[op] = "TARGET_%s" % opname
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f.write("static void *opcode_targets[256] = {\n")
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f.write(",\n".join("\t&&%s" % s for s in targets))
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f.write("\n};\n")
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if __name__ == "__main__":
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import sys
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assert len(sys.argv) < 3, "Too many arguments"
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if len(sys.argv) == 2:
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target = sys.argv[1]
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else:
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target = "Python/opcode_targets.h"
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f = open(target, "w")
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try:
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write_contents(f)
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finally:
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f.close()
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