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GH-93621: reorder code in with/async-with exception exit path to reduce the size of the exception table #93622

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Merged
iritkatriel merged 6 commits into from
Jun 10, 2022
Merged

GH-93621: reorder code in with/async-with exception exit path to reduce the size of the exception table #93622

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acf066c
reorder code in with/async-with exception exit path to reduce the siz…
iritkatriel Jun 8, 2022
4966724
📜🤖 Added by blurb_it.
blurb-it[bot] Jun 9, 2022
dc96fbe
add direct dis tests for with and async-with
iritkatriel Jun 9, 2022
946a191
add some checks for the exception table in dis output
iritkatriel Jun 9, 2022
61729a3
Merge remote-tracking branch 'upstream/main' into with-exception
iritkatriel Jun 9, 2022
38b21f1
update tests after merge
iritkatriel Jun 9, 2022
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add direct dis tests for with and async-with
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@iritkatriel
iritkatriel committed Jun 9, 2022
commit dc96fbec8cc6f18f0d0dec720cbbca83afb700f9
135 changes: 133 additions & 2 deletions Lib/test/test_dis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -421,6 +421,131 @@ def _fstring(a, b, c, d):
RETURN_VALUE
""" % (_fstring.__code__.co_firstlineno, _fstring.__code__.co_firstlineno + 1)

def _with(c):
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with c:
x = 1
y = 2

dis_with = """\
%3d RESUME 0

%3d LOAD_FAST 0 (c)
BEFORE_WITH
POP_TOP

%3d LOAD_CONST 1 (1)
STORE_FAST 1 (x)

%3d LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
CALL 2
POP_TOP

%3d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
LOAD_CONST 0 (None)
RETURN_VALUE

%3d >> PUSH_EXC_INFO
WITH_EXCEPT_START
POP_JUMP_FORWARD_IF_TRUE 1 (to 46)
RERAISE 2
>> POP_TOP
POP_EXCEPT
POP_TOP
POP_TOP

%3d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
LOAD_CONST 0 (None)
RETURN_VALUE
>> COPY 3
POP_EXCEPT
RERAISE 1
ExceptionTable:
""" % (_with.__code__.co_firstlineno,
_with.__code__.co_firstlineno + 1,
_with.__code__.co_firstlineno + 2,
_with.__code__.co_firstlineno + 1,
_with.__code__.co_firstlineno + 3,
_with.__code__.co_firstlineno + 1,
_with.__code__.co_firstlineno + 3,
)

async def _asyncwith(c):
async with c:
x = 1
y = 2

dis_asyncwith = """\
%3d RETURN_GENERATOR
POP_TOP
RESUME 0

%3d LOAD_FAST 0 (c)
BEFORE_ASYNC_WITH
GET_AWAITABLE 1
LOAD_CONST 0 (None)
>> SEND 3 (to 22)
YIELD_VALUE 3
RESUME 3
JUMP_BACKWARD_NO_INTERRUPT 4 (to 14)
>> POP_TOP

%3d LOAD_CONST 1 (1)
STORE_FAST 1 (x)

%3d LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
LOAD_CONST 0 (None)
CALL 2
GET_AWAITABLE 2
LOAD_CONST 0 (None)
>> SEND 3 (to 56)
YIELD_VALUE 2
RESUME 3
JUMP_BACKWARD_NO_INTERRUPT 4 (to 48)
>> POP_TOP

%3d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
LOAD_CONST 0 (None)
RETURN_VALUE

%3d >> PUSH_EXC_INFO
WITH_EXCEPT_START
GET_AWAITABLE 2
LOAD_CONST 0 (None)
>> SEND 3 (to 82)
YIELD_VALUE 6
RESUME 3
JUMP_BACKWARD_NO_INTERRUPT 4 (to 74)
>> POP_JUMP_FORWARD_IF_TRUE 1 (to 86)
RERAISE 2
>> POP_TOP
POP_EXCEPT
POP_TOP
POP_TOP

%3d LOAD_CONST 2 (2)
STORE_FAST 2 (y)
LOAD_CONST 0 (None)
RETURN_VALUE
>> COPY 3
POP_EXCEPT
RERAISE 1
ExceptionTable:
""" % (_asyncwith.__code__.co_firstlineno,
_asyncwith.__code__.co_firstlineno + 1,
_asyncwith.__code__.co_firstlineno + 2,
_asyncwith.__code__.co_firstlineno + 1,
_asyncwith.__code__.co_firstlineno + 3,
_asyncwith.__code__.co_firstlineno + 1,
_asyncwith.__code__.co_firstlineno + 3,
)


def _tryfinally(a, b):
try:
return a
Expand Down Expand Up @@ -883,6 +1008,12 @@ def test_disassemble_coroutine(self):
def test_disassemble_fstring(self):
self.do_disassembly_test(_fstring, dis_fstring)

def test_disassemble_with(self):
self.do_disassembly_test(_with, dis_with)

def test_disassemble_asyncwith(self):
self.do_disassembly_test(_asyncwith, dis_asyncwith)

def test_disassemble_try_finally(self):
self.do_disassembly_test(_tryfinally, dis_tryfinally)
self.do_disassembly_test(_tryfinallyconst, dis_tryfinallyconst)
Expand Down Expand Up @@ -1046,8 +1177,8 @@ def test_show_caches(self):
caches = list(self.get_cached_values(quickened, adaptive))
for cache in caches:
self.assertRegex(cache, pattern)
self.assertEqual(caches.count(""), 8)
self.assertEqual(len(caches), 22)
self.assertEqual(caches.count(""), 9)
self.assertEqual(len(caches), 23)


class DisWithFileTests(DisTests):
Expand Down