cpython/Python/makeopcodetargets.py
Victor Stinner a9a852c2b1 Modernize Python/makeopcodetargets.py
* Simply use "import opcode" to import the opcode module instead of tricks
  using the imp module
* Use context manager for the output file
* Move code into a new main() function
* Replace assert with a regular if to check the number of arguments
* Import modules at top level
2016-03-25 11:54:47 +01:00

36 lines
900 B
Python
Executable 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 opcode
import os
import sys
def write_contents(f):
"""Write C code contents to the target file object.
"""
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")
def main():
if len(sys.argv) >= 3:
sys.exit("Too many arguments")
if len(sys.argv) == 2:
target = sys.argv[1]
else:
target = "Python/opcode_targets.h"
with open(target, "w") as f:
write_contents(f)
print("Jump table written into %s" % target)
if __name__ == "__main__":
main()