mirror of https://github.com/python/cpython
140 lines
4.2 KiB
Python
140 lines
4.2 KiB
Python
# This script generates the opcode.h header file.
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import sys
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import tokenize
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header = """
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/* Auto-generated by Tools/scripts/generate_opcode_h.py from Lib/opcode.py */
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#ifndef Py_OPCODE_H
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#define Py_OPCODE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Instruction opcodes for compiled code */
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""".lstrip()
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footer = """
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#define HAS_ARG(op) ((op) >= HAVE_ARGUMENT)
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/* Reserve some bytecodes for internal use in the compiler.
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* The value of 240 is arbitrary. */
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#define IS_ARTIFICIAL(op) ((op) > 240)
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_OPCODE_H */
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"""
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DEFINE = "#define {:<38} {:>3}\n"
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UINT32_MASK = (1<<32)-1
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def write_int_array_from_ops(name, ops, out):
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bits = 0
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for op in ops:
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bits |= 1<<op
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out.write(f"static const uint32_t {name}[8] = {{\n")
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for i in range(8):
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out.write(f" {bits & UINT32_MASK}U,\n")
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bits >>= 32
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assert bits == 0
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out.write(f"}};\n")
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def main(opcode_py, outfile='Include/opcode.h'):
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opcode = {}
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if hasattr(tokenize, 'open'):
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fp = tokenize.open(opcode_py) # Python 3.2+
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else:
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fp = open(opcode_py) # Python 2.7
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with fp:
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code = fp.read()
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exec(code, opcode)
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opmap = opcode['opmap']
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opname = opcode['opname']
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hasconst = opcode['hasconst']
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hasjrel = opcode['hasjrel']
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hasjabs = opcode['hasjabs']
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used = [ False ] * 256
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next_op = 1
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for name, op in opmap.items():
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used[op] = True
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specialized_opmap = {}
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opname_including_specialized = opname.copy()
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for name in opcode['_specialized_instructions']:
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while used[next_op]:
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next_op += 1
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specialized_opmap[name] = next_op
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opname_including_specialized[next_op] = name
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used[next_op] = True
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specialized_opmap['DO_TRACING'] = 255
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opname_including_specialized[255] = 'DO_TRACING'
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used[255] = True
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with open(outfile, 'w') as fobj:
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fobj.write(header)
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for name in opname:
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if name in opmap:
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fobj.write(DEFINE.format(name, opmap[name]))
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if name == 'POP_EXCEPT': # Special entry for HAVE_ARGUMENT
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fobj.write(DEFINE.format("HAVE_ARGUMENT", opcode["HAVE_ARGUMENT"]))
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for name, op in specialized_opmap.items():
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fobj.write(DEFINE.format(name, op))
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fobj.write("\nextern const uint8_t _PyOpcode_Caches[256];\n")
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fobj.write("\nextern const uint8_t _PyOpcode_Deopt[256];\n")
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fobj.write("\n#ifdef NEED_OPCODE_TABLES\n")
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write_int_array_from_ops("_PyOpcode_RelativeJump", opcode['hasjrel'], fobj)
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write_int_array_from_ops("_PyOpcode_Jump", opcode['hasjrel'] + opcode['hasjabs'], fobj)
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fobj.write("\nconst uint8_t _PyOpcode_Caches[256] = {\n")
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for i, entries in enumerate(opcode["_inline_cache_entries"]):
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if entries:
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fobj.write(f" [{opname[i]}] = {entries},\n")
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fobj.write("};\n")
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deoptcodes = {}
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for basic in opmap:
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deoptcodes[basic] = basic
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for basic, family in opcode["_specializations"].items():
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for specialized in family:
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deoptcodes[specialized] = basic
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fobj.write("\nconst uint8_t _PyOpcode_Deopt[256] = {\n")
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for opt, deopt in sorted(deoptcodes.items()):
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fobj.write(f" [{opt}] = {deopt},\n")
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fobj.write("};\n")
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fobj.write("#endif /* OPCODE_TABLES */\n")
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fobj.write("\n")
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fobj.write("#define HAS_CONST(op) (false\\")
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for op in hasconst:
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fobj.write(f"\n || ((op) == {op}) \\")
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fobj.write("\n )\n")
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fobj.write("\n")
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for i, (op, _) in enumerate(opcode["_nb_ops"]):
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fobj.write(DEFINE.format(op, i))
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fobj.write("\n")
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fobj.write("#ifdef Py_DEBUG\n")
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fobj.write("static const char *const _PyOpcode_OpName[256] = {\n")
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for op, name in enumerate(opname_including_specialized):
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if name[0] != "<":
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op = name
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fobj.write(f''' [{op}] = "{name}",\n''')
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fobj.write("};\n")
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fobj.write("#endif\n")
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fobj.write(footer)
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print(f"{outfile} regenerated from {opcode_py}")
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if __name__ == '__main__':
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main(sys.argv[1], sys.argv[2])
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