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Title: bpo-40222: "Zero cost" exception handling by markshannon · Pull Request #25729 · python/cpython · GitHub

Open Graph Title: bpo-40222: "Zero cost" exception handling by markshannon · Pull Request #25729 · python/cpython

X Title: bpo-40222: "Zero cost" exception handling by markshannon · Pull Request #25729 · python/cpython

Description: For example, this function: def f(): try: g(0) except: return "fail" compiles as follows on main: 2 0 SETUP_FINALLY 7 (to 16) 3 2 LOAD_GLOBAL 0 (g) 4 LOAD_CONST 1 (0) 6 CALL_FUNCTION 1 8 POP_TOP 10 POP_BLOCK 12 LOAD_CONST 0 (None) 14 RETURN_VALUE 4 >> 16 POP_TOP 18 POP_TOP 20 POP_TOP 5 22 POP_EXCEPT 24 LOAD_CONST 3 ('fail') 26 RETURN_VALUE with this PR it compiles as follows: 2 0 NOP 3 2 LOAD_GLOBAL 0 (g) 4 LOAD_CONST 1 (0) 6 CALL_FUNCTION 1 8 POP_TOP 10 LOAD_CONST 0 (None) 12 RETURN_VALUE >> 14 PUSH_EXC_INFO 4 16 POP_TOP 18 POP_TOP 20 POP_TOP 5 22 POP_EXCEPT 24 LOAD_CONST 2 ('fail') 26 RETURN_VALUE >> 28 POP_EXCEPT_AND_RERAISE ExceptionTable: 2 to 8 -> 14 [0] 14 to 20 -> 28 [3] lasti This is not quite zero-cost at the moment, as it leaves a NOPs for each try, and possibly a few other. Removing NOPs that are on a line by themselves will require changes to the line number table, which has nothing to do with exception handling and I don't want to mix the two PRs. Although the code is slightly longer overall, there is less work done on the non-exceptional path, one NOP versus a SETUP_FINALLY and POP_BLOCK. Not only is there a reduction in work done in the bytecode, but in the size of frames is reduced a lot: def frame_size(): return sys.getsizeof(sys._getframe()) On master: >>> frame_size() 400 with this PR: >>> frame_size() 152 https://bugs.python.org/issue40222

Open Graph Description: For example, this function: def f(): try: g(0) except: return "fail" compiles as follows on main: 2 0 SETUP_FINALLY 7 (to 16) 3 ...

X Description: For example, this function: def f(): try: g(0) except: return "fail" compiles as follows on main: 2 0 SETUP_FINALLY 7 (to 16) 3 ...

Opengraph URL: https://github.com/python/cpython/pull/25729

X: @github

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Show all changes 45 commits https://github.com/python/cpython/pull/25729/files
a414fa6 Add SETUP_CLEANUP bytecode to track lasti for re-raising exceptions i… markshannon Apr 19, 2021 https://github.com/python/cpython/pull/25729/commits/a414fa623f2bb425b0cba95c03a46310c3c4c6d6
902690d Move some handling of exceptions to bytecode from unwind code. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/902690d10b1eb14f05df62ece5145289908c97a2
21646b1 Move setting up except block out of unwind code into bytecode. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/21646b10fefdf1999fd0a4511ad726cddaefb369
9c9575a Move cleanup code for try-finally and try-except in bytecode. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/9c9575ae5a19dbe56ddd55acc7a79aa3abedab3a
3be89db Move cleanup code for with and sync with into bytecode. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/3be89dbafc043cb39d5cfcd94e32d203551524a4
cf664f7 Simplify exit code for async for loops. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/cf664f7f8ab31df3024e2492c78f72fac0291540
722b722 Remove SETUP_EXCEPT opcode. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/722b7225488e06bc2fd56d413d3ea5f08036c984
caa355f Remove EXCEPT_HANDLER as a type of exception handling block. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/caa355f04660f005e2fa27ed6eaebd0fb06121e7
4c21ddd Factor out all block pops and pushes into simple opcodes. markshannon Apr 21, 2021 https://github.com/python/cpython/pull/25729/commits/4c21ddd190521036bcf71ed579fc9f49f07b74d9
6a8d90c Generate exception handling table markshannon Apr 22, 2021 https://github.com/python/cpython/pull/25729/commits/6a8d90c0789d7f323428a51cf5197893f7a22f16
9115cea Parse and verify exception table when unwinding exceptions. markshannon Apr 23, 2021 https://github.com/python/cpython/pull/25729/commits/9115cea2ac00553ccde1fab1f016800547a10668
350334c Update test to account for new code object constructor. markshannon Apr 26, 2021 https://github.com/python/cpython/pull/25729/commits/350334cb55fe3201c4fb0ce2afb7077de30ad4dd
d6da9cb Push lasti to stack when cleaning up exception handlers, and use it t… markshannon Apr 26, 2021 https://github.com/python/cpython/pull/25729/commits/d6da9cbeac6b1cd7386bfec18adb8d077764d616
a6b9292 Remove block stack from frames add convert SETUP/POP_BLOCK instructio… markshannon Apr 26, 2021 https://github.com/python/cpython/pull/25729/commits/a6b9292b05b1f6bc9752024c0b3b8d2c5ed93b28
9d0a6c1 Make dis understand the exception table. markshannon Apr 29, 2021 https://github.com/python/cpython/pull/25729/commits/9d0a6c1aaa42be0a10d90856f9926c250046fead
ca482d0 Merge branch 'master' into zero-cost-except markshannon Apr 29, 2021 https://github.com/python/cpython/pull/25729/commits/ca482d0770a509b76a3aa6c36d52994a33ad56fa
4629a97 Set line numbers at start of exception handlers in try-except and try… markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/4629a97ac7b81c59bd10412e711884a05445ab99
58b4a5a Handle exceptions in trace functions correctly. markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/58b4a5a41c749c6d4930e25779d8581fc6a5a999
e7a9221 Fix syntax error test. markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/e7a9221e4b6ed4f6bbdf4174226557f83416f205
062ffa4 Get frame.setlineno working again. markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/062ffa41262fd96dc3cbce8740ec3c60d934a060
71d95c1 Merge branch 'master' into zero-cost-except markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/71d95c11e07ab7ce86fea0c719ff0e067168d92f
e5c2c3e Remove debugging prints markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/e5c2c3e1e09b74f6ea81704548bf295157b64488
7571e90 Fix test_dis after merge markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/7571e90b38c59adc0354bfa67b70d7963a956038
812e78f Layout frameobject in most compact form. markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/812e78f4b0f9c6f05d27a69a955004c2449a76c2
5801089 Add NEWS. markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/5801089bba65b6e4a41e52681fa946d6bb257a43
8cb6366 Remove SETUP_FINALLY, SETUP_ASYNC_WITH, SETUP_CLEANUP, POP_BLOCK inst… markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/8cb6366d8c11b661c80191bf9fb39403eb8e121b
4ec3417 Update dis.rst markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/4ec3417244842dc50ef1b45a422366006f43492b
07cd46d fix NEWS formatting markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/07cd46d931131d7e8cc9c5f3d5b9cea5b0a0064f
3b52a3f Fix typos and clarify text. markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/3b52a3f683f3adc87289b7c2f242f5a39e4d224c
594a636 Restore dis after discarded experiment. markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/594a636067fa73f7bae40736ad9531b7f967f2e3
585f306 Bump magic number for 3.11 markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/585f306a2d1e5941b4962978c3a710090e117dad
0f11d34 Fix typo markshannon Apr 30, 2021 https://github.com/python/cpython/pull/25729/commits/0f11d34efb419c4cf0403e58e25f79b99f31b277
63a9b0e Merge branch 'master' into zero-cost-except markshannon May 3, 2021 https://github.com/python/cpython/pull/25729/commits/63a9b0e09d1a262b68fa991e79ceaecd4b4d05d1
133f74f Re-order optimization passes to remove more NOPs. markshannon May 3, 2021 https://github.com/python/cpython/pull/25729/commits/133f74f78c80566115d968c9ff90704558f3f09f
299e051 Update importlib yet again. markshannon May 3, 2021 https://github.com/python/cpython/pull/25729/commits/299e051e9a480081daf0267cb1404e6055495f80
43c199d Assorted clarifications. markshannon May 6, 2021 https://github.com/python/cpython/pull/25729/commits/43c199dd8581cf095462fe47a0a2896103d79775
630e755 Rename frame.setlineno assistant code to clarify that we now model th… markshannon May 6, 2021 https://github.com/python/cpython/pull/25729/commits/630e7553db83c042e8b34ac8482a02fd360f6e39
6333f6c Revert mistaken change. markshannon May 6, 2021 https://github.com/python/cpython/pull/25729/commits/6333f6c5b9b9237bd75fd695591588c29259cf44
e1d6e1e Update Include/opcode.h markshannon May 6, 2021 https://github.com/python/cpython/pull/25729/commits/e1d6e1e2de2bc5768006afd2c5ac1742289f1c6b
73b600a Extend notes on exception handling. markshannon May 6, 2021 https://github.com/python/cpython/pull/25729/commits/73b600acaec136887157cc88863f9ae9ea906409
f263ee2 Fix refleaks markshannon May 6, 2021 https://github.com/python/cpython/pull/25729/commits/f263ee2935787c7d2de7d889e5ea6dc60706948b
2f31c84 Merge branch 'main' into zero-cost-except markshannon May 7, 2021 https://github.com/python/cpython/pull/25729/commits/2f31c84bcabba52948f82a5a927e399b7f786e64
0c3fd95 Document removal frame push/pop C-API functions. markshannon May 7, 2021 https://github.com/python/cpython/pull/25729/commits/0c3fd952ff823d554d8245c93d8b75e671e722ba
b92ada2 Update importlib markshannon May 7, 2021 https://github.com/python/cpython/pull/25729/commits/b92ada2b35e3b67d4595372e1a656153a6060dbd
1878117 Clarify exception handling notes markshannon May 7, 2021 https://github.com/python/cpython/pull/25729/commits/1878117bdf2e06c4961234f0bdb8739e9b2a7972
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