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Dir : C:/laragon/bin/python/python-3.10/Tools/scripts/

View File Name : generate_opcode_h.py

# This script generates the opcode.h header file.

import sys
import tokenize

header = """
/* Auto-generated by Tools/scripts/generate_opcode_h.py from Lib/opcode.py */
#ifndef Py_OPCODE_H
#define Py_OPCODE_H
#ifdef __cplusplus
extern "C" {
#endif


    /* Instruction opcodes for compiled code */
""".lstrip()

footer = """
/* EXCEPT_HANDLER is a special, implicit block type which is created when
   entering an except handler. It is not an opcode but we define it here
   as we want it to be available to both frameobject.c and ceval.c, while
   remaining private.*/
#define EXCEPT_HANDLER 257

#define HAS_ARG(op) ((op) >= HAVE_ARGUMENT)

#ifdef __cplusplus
}
#endif
#endif /* !Py_OPCODE_H */
"""

UINT32_MASK = (1<<32)-1

def write_int_array_from_ops(name, ops, out):
    bits = 0
    for op in ops:
        bits |= 1<<op
    out.write(f"static uint32_t {name}[8] = {{\n")
    for i in range(8):
        out.write(f"    {bits & UINT32_MASK}U,\n")
        bits >>= 32
    assert bits == 0
    out.write(f"}};\n")

def main(opcode_py, outfile='Include/opcode.h'):
    opcode = {}
    if hasattr(tokenize, 'open'):
        fp = tokenize.open(opcode_py)   # Python 3.2+
    else:
        fp = open(opcode_py)            # Python 2.7
    with fp:
        code = fp.read()
    exec(code, opcode)
    opmap = opcode['opmap']
    hasjrel = opcode['hasjrel']
    hasjabs = opcode['hasjabs']
    with open(outfile, 'w') as fobj:
        fobj.write(header)
        for name in opcode['opname']:
            if name in opmap:
                fobj.write("#define %-23s %3s\n" % (name, opmap[name]))
            if name == 'POP_EXCEPT': # Special entry for HAVE_ARGUMENT
                fobj.write("#define %-23s %3d\n" %
                            ('HAVE_ARGUMENT', opcode['HAVE_ARGUMENT']))
        fobj.write("#ifdef NEED_OPCODE_JUMP_TABLES\n")
        write_int_array_from_ops("_PyOpcode_RelativeJump", opcode['hasjrel'], fobj)
        write_int_array_from_ops("_PyOpcode_Jump", opcode['hasjrel'] + opcode['hasjabs'], fobj)
        fobj.write("#endif /* OPCODE_TABLES */\n")
        fobj.write(footer)


    print("%s regenerated from %s" % (outfile, opcode_py))


if __name__ == '__main__':
    main(sys.argv[1], sys.argv[2])