/Python/makeopcodetargets.py
http://unladen-swallow.googlecode.com/ · Python · 43 lines · 30 code · 6 blank · 7 comment · 8 complexity · e0f912c24faa0fca0c422a32834fdeee MD5 · raw file
- #! /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).
- """
- 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():
- if opname == "STOP_CODE":
- # XXX opcode not implemented
- continue
- targets[op] = "TARGET_%s" % opname
- f.write("static void *opcode_targets[256] = {\n")
- f.write(",\n".join("\t&&%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()