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# This script generates the opcode.h header file.
import sys
import tokenize
SCRIPT_NAME = "Tools/scripts/generate_opcode_h.py"
PYTHON_OPCODE = "Lib/opcode.py"
header = f"""
// Auto-generated by {SCRIPT_NAME} from {PYTHON_OPCODE}
#ifndef Py_OPCODE_H
#define Py_OPCODE_H
#ifdef __cplusplus
extern "C" {{
#endif
/* Instruction opcodes for compiled code */
""".lstrip()
footer = """
#define HAS_ARG(op) ((op) >= HAVE_ARGUMENT)
/* Reserve some bytecodes for internal use in the compiler.
* The value of 240 is arbitrary. */
#define IS_ARTIFICIAL(op) ((op) > 240)
#ifdef __cplusplus
}
#endif
#endif /* !Py_OPCODE_H */
"""
internal_header = f"""
// Auto-generated by {SCRIPT_NAME} from {PYTHON_OPCODE}
#ifndef Py_INTERNAL_OPCODE_H
#define Py_INTERNAL_OPCODE_H
#ifdef __cplusplus
extern "C" {{
#endif
#ifndef Py_BUILD_CORE
# error "this header requires Py_BUILD_CORE define"
#endif
#include "opcode.h"
""".lstrip()
internal_footer = """
#ifdef __cplusplus
}
#endif
#endif // !Py_INTERNAL_OPCODE_H
"""
DEFINE = "#define {:<38} {:>3}\n"
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 const 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', internaloutfile='Include/internal/pycore_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']
opname = opcode['opname']
hasconst = opcode['hasconst']
hasjrel = opcode['hasjrel']
hasjabs = opcode['hasjabs']
used = [ False ] * 256
next_op = 1
for name, op in opmap.items():
used[op] = True
specialized_opmap = {}
opname_including_specialized = opname.copy()
for name in opcode['_specialized_instructions']:
while used[next_op]:
next_op += 1
specialized_opmap[name] = next_op
opname_including_specialized[next_op] = name
used[next_op] = True
specialized_opmap['DO_TRACING'] = 255
opname_including_specialized[255] = 'DO_TRACING'
used[255] = True
with (open(outfile, 'w') as fobj, open(internaloutfile, 'w') as iobj):
fobj.write(header)
iobj.write(internal_header)
for name in opname:
if name in opmap:
fobj.write(DEFINE.format(name, opmap[name]))
if name == 'POP_EXCEPT': # Special entry for HAVE_ARGUMENT
fobj.write(DEFINE.format("HAVE_ARGUMENT", opcode["HAVE_ARGUMENT"]))
for name, op in specialized_opmap.items():
fobj.write(DEFINE.format(name, op))
iobj.write("\nextern const uint8_t _PyOpcode_Caches[256];\n")
iobj.write("\nextern const uint8_t _PyOpcode_Deopt[256];\n")
iobj.write("\nextern const uint8_t _PyOpcode_Original[256];\n")
iobj.write("\n#ifdef NEED_OPCODE_TABLES\n")
write_int_array_from_ops("_PyOpcode_RelativeJump", opcode['hasjrel'], iobj)
write_int_array_from_ops("_PyOpcode_Jump", opcode['hasjrel'] + opcode['hasjabs'], iobj)
iobj.write("\nconst uint8_t _PyOpcode_Caches[256] = {\n")
for i, entries in enumerate(opcode["_inline_cache_entries"]):
if entries:
iobj.write(f" [{opname[i]}] = {entries},\n")
iobj.write("};\n")
deoptcodes = {}
for basic in opmap:
deoptcodes[basic] = basic
for basic, family in opcode["_specializations"].items():
for specialized in family:
deoptcodes[specialized] = basic
iobj.write("\nconst uint8_t _PyOpcode_Deopt[256] = {\n")
for opt, deopt in sorted(deoptcodes.items()):
iobj.write(f" [{opt}] = {deopt},\n")
iobj.write("};\n")
iobj.write("\nconst uint8_t _PyOpcode_Original[256] = {\n")
for opt, deopt in sorted(deoptcodes.items()):
if opt.startswith("EXTENDED_ARG"):
deopt = "EXTENDED_ARG_QUICK"
iobj.write(f" [{opt}] = {deopt},\n")
iobj.write("};\n")
iobj.write("#endif // NEED_OPCODE_TABLES\n")
fobj.write("\n")
fobj.write("#define HAS_CONST(op) (false\\")
for op in hasconst:
fobj.write(f"\n || ((op) == {op}) \\")
fobj.write("\n )\n")
fobj.write("\n")
for i, (op, _) in enumerate(opcode["_nb_ops"]):
fobj.write(DEFINE.format(op, i))
iobj.write("\n")
iobj.write("#ifdef Py_DEBUG\n")
iobj.write("static const char *const _PyOpcode_OpName[256] = {\n")
for op, name in enumerate(opname_including_specialized):
if name[0] != "<":
op = name
iobj.write(f''' [{op}] = "{name}",\n''')
iobj.write("};\n")
iobj.write("#endif\n")
iobj.write("\n")
iobj.write("#define EXTRA_CASES \\\n")
for i, flag in enumerate(used):
if not flag:
iobj.write(f" case {i}: \\\n")
iobj.write(" ;\n")
fobj.write(footer)
iobj.write(internal_footer)
print(f"{outfile} regenerated from {opcode_py}")
if __name__ == '__main__':
main(sys.argv[1], sys.argv[2], sys.argv[3])
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