mirror of
https://github.com/python/cpython.git
synced 2025-11-03 07:01:21 +00:00
61 lines
1.8 KiB
Python
Executable file
61 lines
1.8 KiB
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 os
|
|
import sys
|
|
|
|
|
|
try:
|
|
from importlib.machinery import SourceFileLoader
|
|
except ImportError:
|
|
import imp
|
|
|
|
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]))
|
|
else:
|
|
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", modname + ".py")
|
|
return SourceFileLoader(modname, modpath).load_module()
|
|
|
|
|
|
def write_contents(f):
|
|
"""Write C code contents to the target file object.
|
|
"""
|
|
opcode = find_module('opcode')
|
|
targets = ['_unknown_opcode'] * 256
|
|
targets[255] = "TARGET_DO_TRACING"
|
|
for opname, op in opcode.opmap.items():
|
|
targets[op] = "TARGET_%s" % opname
|
|
next_op = 1
|
|
for opname in opcode._specialized_instructions:
|
|
while targets[next_op] != '_unknown_opcode':
|
|
next_op += 1
|
|
targets[next_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()
|