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gh-130704: Strength reduce LOAD_FAST{_LOAD_FAST} (#130708)

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Optimize `LOAD_FAST` opcodes into faster versions that load borrowed references onto the operand stack when we can prove that the lifetime of the local outlives the lifetime of the temporary that is loaded onto the stack.
This commit is contained in:
mpage 2025-04-01 10:18:42 -07:00 • committed by GitHub
parent e9556e1004
commit 053c285f6b
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GPG key ID: B5690EEEBB952194
35 changed files with 1282 additions and 345 deletions
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91
Lib/test/test_dis.py
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@ -51,10 +51,10 @@ class _C:
dis_c_instance_method = """\
%3d RESUME 0
%3d LOAD_FAST 1 (x)
%3d LOAD_FAST_BORROW 1 (x)
LOAD_SMALL_INT 1
COMPARE_OP 72 (==)
LOAD_FAST 0 (self)
LOAD_FAST_BORROW 0 (self)
STORE_ATTR 0 (x)
LOAD_CONST 1 (None)
RETURN_VALUE
@ -62,10 +62,10 @@ dis_c_instance_method = """\
dis_c_instance_method_bytes = """\
RESUME 0
LOAD_FAST 1
LOAD_FAST_BORROW 1
LOAD_SMALL_INT 1
COMPARE_OP 72 (==)
LOAD_FAST 0
LOAD_FAST_BORROW 0
STORE_ATTR 0
LOAD_CONST 1
RETURN_VALUE
@ -74,10 +74,10 @@ dis_c_instance_method_bytes = """\
dis_c_class_method = """\
%3d RESUME 0
%3d LOAD_FAST 1 (x)
%3d LOAD_FAST_BORROW 1 (x)
LOAD_SMALL_INT 1
COMPARE_OP 72 (==)
LOAD_FAST 0 (cls)
LOAD_FAST_BORROW 0 (cls)
STORE_ATTR 0 (x)
LOAD_CONST 1 (None)
RETURN_VALUE
@ -86,7 +86,7 @@ dis_c_class_method = """\
dis_c_static_method = """\
%3d RESUME 0
%3d LOAD_FAST 0 (x)
%3d LOAD_FAST_BORROW 0 (x)
LOAD_SMALL_INT 1
COMPARE_OP 72 (==)
STORE_FAST 0 (x)
@ -114,7 +114,7 @@ dis_f = """\
%3d RESUME 0
%3d LOAD_GLOBAL 1 (print + NULL)
LOAD_FAST 0 (a)
LOAD_FAST_BORROW 0 (a)
CALL 1
POP_TOP
@ -128,7 +128,7 @@ dis_f_with_offsets = """\
%3d 0 RESUME 0
%3d 2 LOAD_GLOBAL 1 (print + NULL)
12 LOAD_FAST 0 (a)
12 LOAD_FAST_BORROW 0 (a)
14 CALL 1
22 POP_TOP
@ -142,7 +142,7 @@ dis_f_with_positions_format = f"""\
%-14s RESUME 0
%-14s LOAD_GLOBAL 1 (print + NULL)
%-14s LOAD_FAST 0 (a)
%-14s LOAD_FAST_BORROW 0 (a)
%-14s CALL 1
%-14s POP_TOP
@ -153,7 +153,7 @@ dis_f_with_positions_format = f"""\
dis_f_co_code = """\
RESUME 0
LOAD_GLOBAL 1
LOAD_FAST 0
LOAD_FAST_BORROW 0
CALL 1
POP_TOP
LOAD_SMALL_INT 1
@ -203,7 +203,7 @@ dis_bug1333982 = """\
%3d LOAD_COMMON_CONSTANT 0 (AssertionError)
LOAD_CONST 1 (<code object <genexpr> at 0x..., file "%s", line %d>)
MAKE_FUNCTION
LOAD_FAST 0 (x)
LOAD_FAST_BORROW 0 (x)
GET_ITER
CALL 0
@ -503,18 +503,18 @@ def _fstring(a, b, c, d):
dis_fstring = """\
%3d RESUME 0
%3d LOAD_FAST 0 (a)
%3d LOAD_FAST_BORROW 0 (a)
FORMAT_SIMPLE
LOAD_CONST 0 (' ')
LOAD_FAST 1 (b)
LOAD_FAST_BORROW 1 (b)
LOAD_CONST 1 ('4')
FORMAT_WITH_SPEC
LOAD_CONST 0 (' ')
LOAD_FAST 2 (c)
LOAD_FAST_BORROW 2 (c)
CONVERT_VALUE 2 (repr)
FORMAT_SIMPLE
LOAD_CONST 0 (' ')
LOAD_FAST 3 (d)
LOAD_FAST_BORROW 3 (d)
CONVERT_VALUE 2 (repr)
LOAD_CONST 1 ('4')
FORMAT_WITH_SPEC
@ -530,7 +530,7 @@ def _with(c):
dis_with = """\
%4d RESUME 0
%4d LOAD_FAST 0 (c)
%4d LOAD_FAST_BORROW 0 (c)
COPY 1
LOAD_SPECIAL 1 (__exit__)
SWAP 2
@ -595,7 +595,7 @@ dis_asyncwith = """\
POP_TOP
L1: RESUME 0
%4d LOAD_FAST 0 (c)
%4d LOAD_FAST_BORROW 0 (c)
COPY 1
LOAD_SPECIAL 3 (__aexit__)
SWAP 2
@ -707,9 +707,9 @@ dis_tryfinally = """\
%4d NOP
%4d L1: LOAD_FAST 0 (a)
%4d L1: LOAD_FAST_BORROW 0 (a)
%4d L2: LOAD_FAST 1 (b)
%4d L2: LOAD_FAST_BORROW 1 (b)
PUSH_NULL
CALL 0
POP_TOP
@ -743,7 +743,7 @@ dis_tryfinallyconst = """\
%4d NOP
%4d LOAD_FAST 0 (b)
%4d LOAD_FAST_BORROW 0 (b)
PUSH_NULL
CALL 0
POP_TOP
@ -791,14 +791,14 @@ dis_nested_0 = """\
%4d RESUME 0
%4d LOAD_FAST 0 (y)
%4d LOAD_FAST_BORROW 0 (y)
BUILD_TUPLE 1
LOAD_CONST 0 (<code object foo at 0x..., file "%s", line %d>)
MAKE_FUNCTION
SET_FUNCTION_ATTRIBUTE 8 (closure)
STORE_FAST 1 (foo)
%4d LOAD_FAST 1 (foo)
%4d LOAD_FAST_BORROW 1 (foo)
RETURN_VALUE
""" % (_h.__code__.co_firstlineno,
_h.__code__.co_firstlineno + 1,
@ -815,7 +815,7 @@ Disassembly of <code object foo at 0x..., file "%s", line %d>:
%4d RESUME 0
%4d LOAD_GLOBAL 1 (list + NULL)
LOAD_FAST 0 (x)
LOAD_FAST_BORROW 0 (x)
BUILD_TUPLE 1
LOAD_CONST 1 (<code object <genexpr> at 0x..., file "%s", line %d>)
MAKE_FUNCTION
@ -841,12 +841,12 @@ Disassembly of <code object <genexpr> at 0x..., file "%s", line %d>:
%4d RETURN_GENERATOR
POP_TOP
L1: RESUME 0
LOAD_FAST 0 (.0)
LOAD_FAST_BORROW 0 (.0)
GET_ITER
L2: FOR_ITER 14 (to L3)
STORE_FAST 1 (z)
LOAD_DEREF 2 (x)
LOAD_FAST 1 (z)
LOAD_FAST_BORROW 1 (z)
BINARY_OP 0 (+)
YIELD_VALUE 0
RESUME 5
@ -877,7 +877,7 @@ dis_load_test_quickened_code = """\
%3d LOAD_FAST_LOAD_FAST 1 (x, y)
STORE_FAST_STORE_FAST 50 (b, a)
%3d LOAD_FAST_LOAD_FAST 35 (a, b)
%3d LOAD_FAST_BORROW_LOAD_FAST_BORROW 35 (a, b)
BUILD_TUPLE 2
RETURN_VALUE
""" % (load_test.__code__.co_firstlineno,
@ -901,7 +901,7 @@ dis_loop_test_quickened_code = """\
STORE_FAST 0 (i)
%3d LOAD_GLOBAL_MODULE 1 (load_test + NULL)
LOAD_FAST 0 (i)
LOAD_FAST_BORROW 0 (i)
CALL_PY_GENERAL 1
POP_TOP
JUMP_BACKWARD_{: <6} 16 (to L1)
@ -996,6 +996,7 @@ class DisTests(DisTestBase):
def test_widths(self):
long_opcodes = set(['JUMP_BACKWARD_NO_INTERRUPT',
'LOAD_FAST_BORROW_LOAD_FAST_BORROW',
'INSTRUMENTED_CALL_FUNCTION_EX'])
for op, opname in enumerate(dis.opname):
if opname in long_opcodes or opname.startswith("INSTRUMENTED"):
@ -1739,8 +1740,8 @@ expected_opinfo_outer = [
make_inst(opname='MAKE_CELL', arg=1, argval='b', argrepr='b', offset=2, start_offset=2, starts_line=False, line_number=None),
make_inst(opname='RESUME', arg=0, argval=0, argrepr='', offset=4, start_offset=4, starts_line=True, line_number=1),
make_inst(opname='LOAD_CONST', arg=4, argval=(3, 4), argrepr='(3, 4)', offset=6, start_offset=6, starts_line=True, line_number=2),
make_inst(opname='LOAD_FAST', arg=0, argval='a', argrepr='a', offset=8, start_offset=8, starts_line=False, line_number=2),
make_inst(opname='LOAD_FAST', arg=1, argval='b', argrepr='b', offset=10, start_offset=10, starts_line=False, line_number=2),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='a', argrepr='a', offset=8, start_offset=8, starts_line=False, line_number=2),
make_inst(opname='LOAD_FAST_BORROW', arg=1, argval='b', argrepr='b', offset=10, start_offset=10, starts_line=False, line_number=2),
make_inst(opname='BUILD_TUPLE', arg=2, argval=2, argrepr='', offset=12, start_offset=12, starts_line=False, line_number=2),
make_inst(opname='LOAD_CONST', arg=1, argval=code_object_f, argrepr=repr(code_object_f), offset=14, start_offset=14, starts_line=False, line_number=2),
make_inst(opname='MAKE_FUNCTION', arg=None, argval=None, argrepr='', offset=16, start_offset=16, starts_line=False, line_number=2),
@ -1757,7 +1758,7 @@ expected_opinfo_outer = [
make_inst(opname='LOAD_CONST', arg=3, argval='Hello world!', argrepr="'Hello world!'", offset=46, start_offset=46, starts_line=False, line_number=7),
make_inst(opname='CALL', arg=7, argval=7, argrepr='', offset=48, start_offset=48, starts_line=False, line_number=7, cache_info=[('counter', 1, b'\x00\x00'), ('func_version', 2, b'\x00\x00\x00\x00')]),
make_inst(opname='POP_TOP', arg=None, argval=None, argrepr='', offset=56, start_offset=56, starts_line=False, line_number=7),
make_inst(opname='LOAD_FAST', arg=2, argval='f', argrepr='f', offset=58, start_offset=58, starts_line=True, line_number=8),
make_inst(opname='LOAD_FAST_BORROW', arg=2, argval='f', argrepr='f', offset=58, start_offset=58, starts_line=True, line_number=8),
make_inst(opname='RETURN_VALUE', arg=None, argval=None, argrepr='', offset=60, start_offset=60, starts_line=False, line_number=8),
]
@ -1767,10 +1768,10 @@ expected_opinfo_f = [
make_inst(opname='MAKE_CELL', arg=1, argval='d', argrepr='d', offset=4, start_offset=4, starts_line=False, line_number=None),
make_inst(opname='RESUME', arg=0, argval=0, argrepr='', offset=6, start_offset=6, starts_line=True, line_number=2),
make_inst(opname='LOAD_CONST', arg=2, argval=(5, 6), argrepr='(5, 6)', offset=8, start_offset=8, starts_line=True, line_number=3),
make_inst(opname='LOAD_FAST', arg=3, argval='a', argrepr='a', offset=10, start_offset=10, starts_line=False, line_number=3),
make_inst(opname='LOAD_FAST', arg=4, argval='b', argrepr='b', offset=12, start_offset=12, starts_line=False, line_number=3),
make_inst(opname='LOAD_FAST', arg=0, argval='c', argrepr='c', offset=14, start_offset=14, starts_line=False, line_number=3),
make_inst(opname='LOAD_FAST', arg=1, argval='d', argrepr='d', offset=16, start_offset=16, starts_line=False, line_number=3),
make_inst(opname='LOAD_FAST_BORROW', arg=3, argval='a', argrepr='a', offset=10, start_offset=10, starts_line=False, line_number=3),
make_inst(opname='LOAD_FAST_BORROW', arg=4, argval='b', argrepr='b', offset=12, start_offset=12, starts_line=False, line_number=3),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='c', argrepr='c', offset=14, start_offset=14, starts_line=False, line_number=3),
make_inst(opname='LOAD_FAST_BORROW', arg=1, argval='d', argrepr='d', offset=16, start_offset=16, starts_line=False, line_number=3),
make_inst(opname='BUILD_TUPLE', arg=4, argval=4, argrepr='', offset=18, start_offset=18, starts_line=False, line_number=3),
make_inst(opname='LOAD_CONST', arg=1, argval=code_object_inner, argrepr=repr(code_object_inner), offset=20, start_offset=20, starts_line=False, line_number=3),
make_inst(opname='MAKE_FUNCTION', arg=None, argval=None, argrepr='', offset=22, start_offset=22, starts_line=False, line_number=3),
@ -1784,7 +1785,7 @@ expected_opinfo_f = [
make_inst(opname='LOAD_DEREF', arg=1, argval='d', argrepr='d', offset=46, start_offset=46, starts_line=False, line_number=5),
make_inst(opname='CALL', arg=4, argval=4, argrepr='', offset=48, start_offset=48, starts_line=False, line_number=5, cache_info=[('counter', 1, b'\x00\x00'), ('func_version', 2, b'\x00\x00\x00\x00')]),
make_inst(opname='POP_TOP', arg=None, argval=None, argrepr='', offset=56, start_offset=56, starts_line=False, line_number=5),
make_inst(opname='LOAD_FAST', arg=2, argval='inner', argrepr='inner', offset=58, start_offset=58, starts_line=True, line_number=6),
make_inst(opname='LOAD_FAST_BORROW', arg=2, argval='inner', argrepr='inner', offset=58, start_offset=58, starts_line=True, line_number=6),
make_inst(opname='RETURN_VALUE', arg=None, argval=None, argrepr='', offset=60, start_offset=60, starts_line=False, line_number=6),
]
@ -1796,7 +1797,7 @@ expected_opinfo_inner = [
make_inst(opname='LOAD_DEREF', arg=3, argval='b', argrepr='b', offset=16, start_offset=16, starts_line=False, line_number=4),
make_inst(opname='LOAD_DEREF', arg=4, argval='c', argrepr='c', offset=18, start_offset=18, starts_line=False, line_number=4),
make_inst(opname='LOAD_DEREF', arg=5, argval='d', argrepr='d', offset=20, start_offset=20, starts_line=False, line_number=4),
make_inst(opname='LOAD_FAST_LOAD_FAST', arg=1, argval=('e', 'f'), argrepr='e, f', offset=22, start_offset=22, starts_line=False, line_number=4),
make_inst(opname='LOAD_FAST_BORROW_LOAD_FAST_BORROW', arg=1, argval=('e', 'f'), argrepr='e, f', offset=22, start_offset=22, starts_line=False, line_number=4),
make_inst(opname='CALL', arg=6, argval=6, argrepr='', offset=24, start_offset=24, starts_line=False, line_number=4, cache_info=[('counter', 1, b'\x00\x00'), ('func_version', 2, b'\x00\x00\x00\x00')]),
make_inst(opname='POP_TOP', arg=None, argval=None, argrepr='', offset=32, start_offset=32, starts_line=False, line_number=4),
make_inst(opname='LOAD_CONST', arg=0, argval=None, argrepr='None', offset=34, start_offset=34, starts_line=False, line_number=4),
@ -1812,16 +1813,16 @@ expected_opinfo_jumpy = [
make_inst(opname='FOR_ITER', arg=32, argval=92, argrepr='to L4', offset=24, start_offset=24, starts_line=False, line_number=3, label=1, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='STORE_FAST', arg=0, argval='i', argrepr='i', offset=28, start_offset=28, starts_line=False, line_number=3),
make_inst(opname='LOAD_GLOBAL', arg=3, argval='print', argrepr='print + NULL', offset=30, start_offset=30, starts_line=True, line_number=4, cache_info=[('counter', 1, b'\x00\x00'), ('index', 1, b'\x00\x00'), ('module_keys_version', 1, b'\x00\x00'), ('builtin_keys_version', 1, b'\x00\x00')]),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=40, start_offset=40, starts_line=False, line_number=4),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=40, start_offset=40, starts_line=False, line_number=4),
make_inst(opname='CALL', arg=1, argval=1, argrepr='', offset=42, start_offset=42, starts_line=False, line_number=4, cache_info=[('counter', 1, b'\x00\x00'), ('func_version', 2, b'\x00\x00\x00\x00')]),
make_inst(opname='POP_TOP', arg=None, argval=None, argrepr='', offset=50, start_offset=50, starts_line=False, line_number=4),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=52, start_offset=52, starts_line=True, line_number=5),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=52, start_offset=52, starts_line=True, line_number=5),
make_inst(opname='LOAD_SMALL_INT', arg=4, argval=4, argrepr='', offset=54, start_offset=54, starts_line=False, line_number=5),
make_inst(opname='COMPARE_OP', arg=18, argval='<', argrepr='bool(<)', offset=56, start_offset=56, starts_line=False, line_number=5, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='POP_JUMP_IF_FALSE', arg=3, argval=70, argrepr='to L2', offset=60, start_offset=60, starts_line=False, line_number=5, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='NOT_TAKEN', arg=None, argval=None, argrepr='', offset=64, start_offset=64, starts_line=False, line_number=5),
make_inst(opname='JUMP_BACKWARD', arg=23, argval=24, argrepr='to L1', offset=66, start_offset=66, starts_line=True, line_number=6, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=70, start_offset=70, starts_line=True, line_number=7, label=2),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=70, start_offset=70, starts_line=True, line_number=7, label=2),
make_inst(opname='LOAD_SMALL_INT', arg=6, argval=6, argrepr='', offset=72, start_offset=72, starts_line=False, line_number=7),
make_inst(opname='COMPARE_OP', arg=148, argval='>', argrepr='bool(>)', offset=74, start_offset=74, starts_line=False, line_number=7, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='POP_JUMP_IF_TRUE', arg=3, argval=88, argrepr='to L3', offset=78, start_offset=78, starts_line=False, line_number=7, cache_info=[('counter', 1, b'\x00\x00')]),
@ -1840,20 +1841,20 @@ expected_opinfo_jumpy = [
make_inst(opname='POP_JUMP_IF_FALSE', arg=40, argval=212, argrepr='to L8', offset=128, start_offset=128, starts_line=False, line_number=11, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='NOT_TAKEN', arg=None, argval=None, argrepr='', offset=132, start_offset=132, starts_line=False, line_number=11),
make_inst(opname='LOAD_GLOBAL', arg=3, argval='print', argrepr='print + NULL', offset=134, start_offset=134, starts_line=True, line_number=12, cache_info=[('counter', 1, b'\x00\x00'), ('index', 1, b'\x00\x00'), ('module_keys_version', 1, b'\x00\x00'), ('builtin_keys_version', 1, b'\x00\x00')]),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=144, start_offset=144, starts_line=False, line_number=12),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=144, start_offset=144, starts_line=False, line_number=12),
make_inst(opname='CALL', arg=1, argval=1, argrepr='', offset=146, start_offset=146, starts_line=False, line_number=12, cache_info=[('counter', 1, b'\x00\x00'), ('func_version', 2, b'\x00\x00\x00\x00')]),
make_inst(opname='POP_TOP', arg=None, argval=None, argrepr='', offset=154, start_offset=154, starts_line=False, line_number=12),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=156, start_offset=156, starts_line=True, line_number=13),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=156, start_offset=156, starts_line=True, line_number=13),
make_inst(opname='LOAD_SMALL_INT', arg=1, argval=1, argrepr='', offset=158, start_offset=158, starts_line=False, line_number=13),
make_inst(opname='BINARY_OP', arg=23, argval=23, argrepr='-=', offset=160, start_offset=160, starts_line=False, line_number=13, cache_info=[('counter', 1, b'\x00\x00'), ('descr', 4, b'\x00\x00\x00\x00\x00\x00\x00\x00')]),
make_inst(opname='STORE_FAST', arg=0, argval='i', argrepr='i', offset=172, start_offset=172, starts_line=False, line_number=13),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=174, start_offset=174, starts_line=True, line_number=14),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=174, start_offset=174, starts_line=True, line_number=14),
make_inst(opname='LOAD_SMALL_INT', arg=6, argval=6, argrepr='', offset=176, start_offset=176, starts_line=False, line_number=14),
make_inst(opname='COMPARE_OP', arg=148, argval='>', argrepr='bool(>)', offset=178, start_offset=178, starts_line=False, line_number=14, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='POP_JUMP_IF_FALSE', arg=3, argval=192, argrepr='to L6', offset=182, start_offset=182, starts_line=False, line_number=14, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='NOT_TAKEN', arg=None, argval=None, argrepr='', offset=186, start_offset=186, starts_line=False, line_number=14),
make_inst(opname='JUMP_BACKWARD', arg=37, argval=118, argrepr='to L5', offset=188, start_offset=188, starts_line=True, line_number=15, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=192, start_offset=192, starts_line=True, line_number=16, label=6),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=192, start_offset=192, starts_line=True, line_number=16, label=6),
make_inst(opname='LOAD_SMALL_INT', arg=4, argval=4, argrepr='', offset=194, start_offset=194, starts_line=False, line_number=16),
make_inst(opname='COMPARE_OP', arg=18, argval='<', argrepr='bool(<)', offset=196, start_offset=196, starts_line=False, line_number=16, cache_info=[('counter', 1, b'\x00\x00')]),
make_inst(opname='POP_JUMP_IF_TRUE', arg=3, argval=210, argrepr='to L7', offset=200, start_offset=200, starts_line=False, line_number=16, cache_info=[('counter', 1, b'\x00\x00')]),
@ -1869,7 +1870,7 @@ expected_opinfo_jumpy = [
make_inst(opname='LOAD_SMALL_INT', arg=0, argval=0, argrepr='', offset=238, start_offset=238, starts_line=False, line_number=21),
make_inst(opname='BINARY_OP', arg=11, argval=11, argrepr='/', offset=240, start_offset=240, starts_line=False, line_number=21, cache_info=[('counter', 1, b'\x00\x00'), ('descr', 4, b'\x00\x00\x00\x00\x00\x00\x00\x00')]),
make_inst(opname='POP_TOP', arg=None, argval=None, argrepr='', offset=252, start_offset=252, starts_line=False, line_number=21),
make_inst(opname='LOAD_FAST', arg=0, argval='i', argrepr='i', offset=254, start_offset=254, starts_line=True, line_number=25),
make_inst(opname='LOAD_FAST_BORROW', arg=0, argval='i', argrepr='i', offset=254, start_offset=254, starts_line=True, line_number=25),
make_inst(opname='COPY', arg=1, argval=1, argrepr='', offset=256, start_offset=256, starts_line=False, line_number=25),
make_inst(opname='LOAD_SPECIAL', arg=1, argval=1, argrepr='__exit__', offset=258, start_offset=258, starts_line=False, line_number=25),
make_inst(opname='SWAP', arg=2, argval=2, argrepr='', offset=260, start_offset=260, starts_line=False, line_number=25),