1 #! /usr/bin/env python 2 """Generate C code for the jump table of the threaded code interpreter 3 (for compilers supporting computed gotos or "labels-as-values", such as gcc). 4 """ 5 6 # This code should stay compatible with Python 2.3, at least while 7 # some of the buildbots have Python 2.3 as their system Python. 8 9 import imp 10 import os 11 12 13 def find_module(modname): 14 """Finds and returns a module in the local dist/checkout. 15 """ 16 modpath = os.path.join( 17 os.path.dirname(os.path.dirname(__file__)), "Lib") 18 return imp.load_module(modname, *imp.find_module(modname, [modpath])) 19 20 def write_contents(f): 21 """Write C code contents to the target file object. 22 """ 23 opcode = find_module("opcode") 24 targets = ['_unknown_opcode'] * 256 25 for opname, op in opcode.opmap.items(): 26 if opname == "STOP_CODE": 27 continue 28 targets[op] = "TARGET_%s" % opname.replace("+0", " ").replace("+", "_") 29 f.write("static void *opcode_targets[256] = {\n") 30 f.write(",\n".join([" &&%s" % s for s in targets])) 31 f.write("\n};\n") 32 33 34 if __name__ == "__main__": 35 import sys 36 assert len(sys.argv) < 3, "Too many arguments" 37 if len(sys.argv) == 2: 38 target = sys.argv[1] 39 else: 40 target = "Python/opcode_targets.h" 41 f = open(target, "w") 42 try: 43 write_contents(f) 44 finally: 45 f.close() 46
