cpython/Python/makeopcodetargets.py at 3.5 · python/cpython · GitHub

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#! /usr/bin/env python

"""Generate C code for the jump table of the threaded code interpreter

(for compilers supporting computed gotos or "labels-as-values", such as gcc).

"""

# This code should stay compatible with Python 2.3, at least while

# some of the buildbots have Python 2.3 as their system Python.

import imp

import os

def find_module(modname):

"""Finds and returns a module in the local dist/checkout.

"""

modpath = os.path.join(

os.path.dirname(os.path.dirname(__file__)), "Lib")

return imp.load_module(modname, *imp.find_module(modname, [modpath]))

def write_contents(f):

"""Write C code contents to the target file object.

"""

opcode = find_module("opcode")

targets = ['_unknown_opcode'] * 256

for opname, op in opcode.opmap.items():

targets[op] = "TARGET_%s" % opname

f.write("static void *opcode_targets[256] = {\n")

f.write(",\n".join([" &&%s" % s for s in targets]))

f.write("\n};\n")

if __name__ == "__main__":

import sys

assert len(sys.argv) < 3, "Too many arguments"

if len(sys.argv) == 2:

target = sys.argv[1]

else:

target = "Python/opcode_targets.h"

f = open(target, "w")

try:

write_contents(f)

finally:

f.close()