| 1 | n/a | #! /usr/bin/env python |
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| 2 | n/a | """Generate C code for the jump table of the threaded code interpreter |
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| 3 | n/a | (for compilers supporting computed gotos or "labels-as-values", such as gcc). |
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| 4 | n/a | """ |
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| 5 | n/a | |
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| 6 | n/a | import os |
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| 7 | n/a | import sys |
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| 8 | n/a | |
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| 9 | n/a | |
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| 10 | n/a | try: |
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| 11 | n/a | from importlib.machinery import SourceFileLoader |
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| 12 | n/a | except ImportError: |
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| 13 | n/a | import imp |
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| 14 | n/a | |
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| 15 | n/a | def find_module(modname): |
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| 16 | n/a | """Finds and returns a module in the local dist/checkout. |
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| 17 | n/a | """ |
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| 18 | n/a | modpath = os.path.join( |
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| 19 | n/a | os.path.dirname(os.path.dirname(__file__)), "Lib") |
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| 20 | n/a | return imp.load_module(modname, *imp.find_module(modname, [modpath])) |
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| 21 | n/a | else: |
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| 22 | n/a | def find_module(modname): |
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| 23 | n/a | """Finds and returns a module in the local dist/checkout. |
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| 24 | n/a | """ |
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| 25 | n/a | modpath = os.path.join( |
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| 26 | n/a | os.path.dirname(os.path.dirname(__file__)), "Lib", modname + ".py") |
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| 27 | n/a | return SourceFileLoader(modname, modpath).load_module() |
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| 28 | n/a | |
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| 29 | n/a | |
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| 30 | n/a | def write_contents(f): |
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| 31 | n/a | """Write C code contents to the target file object. |
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| 32 | n/a | """ |
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| 33 | n/a | opcode = find_module('opcode') |
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| 34 | n/a | targets = ['_unknown_opcode'] * 256 |
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| 35 | n/a | for opname, op in opcode.opmap.items(): |
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| 36 | n/a | targets[op] = "TARGET_%s" % opname |
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| 37 | n/a | f.write("static void *opcode_targets[256] = {\n") |
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| 38 | n/a | f.write(",\n".join([" &&%s" % s for s in targets])) |
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| 39 | n/a | f.write("\n};\n") |
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| 40 | n/a | |
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| 41 | n/a | |
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| 42 | n/a | def main(): |
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| 43 | n/a | if len(sys.argv) >= 3: |
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| 44 | n/a | sys.exit("Too many arguments") |
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| 45 | n/a | if len(sys.argv) == 2: |
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| 46 | n/a | target = sys.argv[1] |
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| 47 | n/a | else: |
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| 48 | n/a | target = "Python/opcode_targets.h" |
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| 49 | n/a | with open(target, "w") as f: |
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| 50 | n/a | write_contents(f) |
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| 51 | n/a | print("Jump table written into %s" % target) |
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| 52 | n/a | |
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| 53 | n/a | |
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| 54 | n/a | if __name__ == "__main__": |
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| 55 | n/a | main() |
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