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56 lines
1.8 KiB
Python
Executable file
56 lines
1.8 KiB
Python
Executable file
#! /usr/bin/env python
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"""Generate C code for the jump table of the threaded code interpreter
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(for compilers supporting computed gotos or "labels-as-values", such as gcc).
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"""
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import os
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import sys
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# 2023-04-27(warsaw): Pre-Python 3.12, this would catch ImportErrors and try to
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# import imp, and then use imp.load_module(). The imp module was removed in
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# Python 3.12 (and long deprecated before that), and it's unclear under what
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# conditions this import will now fail, so the fallback was simply removed.
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from importlib.machinery import SourceFileLoader
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def find_module(modname):
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"""Finds and returns a module in the local dist/checkout.
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"""
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modpath = os.path.join(
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os.path.dirname(os.path.dirname(__file__)), "Lib", modname + ".py")
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return SourceFileLoader(modname, modpath).load_module()
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def write_contents(f):
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"""Write C code contents to the target file object.
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"""
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opcode = find_module('opcode')
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_opcode_metadata = find_module('_opcode_metadata')
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targets = ['_unknown_opcode'] * 256
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for opname, op in opcode.opmap.items():
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if not opcode.is_pseudo(op):
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targets[op] = "TARGET_%s" % opname
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next_op = 1
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for opname in _opcode_metadata._specialized_instructions:
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while targets[next_op] != '_unknown_opcode':
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next_op += 1
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targets[next_op] = "TARGET_%s" % opname
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f.write("static void *opcode_targets[256] = {\n")
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f.write(",\n".join([" &&%s" % s for s in targets]))
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f.write("\n};\n")
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def main():
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if len(sys.argv) >= 3:
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sys.exit("Too many arguments")
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if len(sys.argv) == 2:
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target = sys.argv[1]
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else:
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target = "Python/opcode_targets.h"
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with open(target, "w") as f:
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write_contents(f)
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print("Jump table written into %s" % target)
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if __name__ == "__main__":
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main()
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