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bpo-40222: "Zero cost" exception handling (GH-25729)

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"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%.
This commit is contained in:
Mark Shannon 2021-05-07 15:19:19 +01:00 • committed by GitHub
parent b32c8e9795
commit adcd220556
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30 changed files with 6614 additions and 5687 deletions
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Lib/test/test_exceptions.py
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@ -218,7 +218,7 @@ class ExceptionTests(unittest.TestCase):
check('class foo:return 1', 1, 11)
check('def f():\n continue', 2, 3)
check('def f():\n break', 2, 3)
check('try:\n pass\nexcept:\n pass\nexcept ValueError:\n pass', 2, 3)
check('try:\n pass\nexcept:\n pass\nexcept ValueError:\n pass', 3, 1)
# Errors thrown by tokenizer.c
check('(0x+1)', 1, 3)