mirror of
https://github.com/python/cpython.git
synced 2025-10-29 20:51:26 +00:00
adcd220556
"Zero cost" exception handling. * Uses a lookup table to determine how to handle exceptions. * Removes SETUP_FINALLY and POP_TOP block instructions, eliminating (most of) the runtime overhead of try statements. * Reduces the size of the frame object by about 60%.
75 lines
2 KiB
Python
75 lines
2 KiB
Python
# 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 = """
|
|
#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 */
|
|
"""
|
|
|
|
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])
|