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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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GPG key ID: 4AEE18F83AFDEB23
30 changed files with 6614 additions and 5687 deletions
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7
Lib/test/test_sys.py
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@ -1273,13 +1273,12 @@ class SizeofTest(unittest.TestCase):
check(sys.float_info, vsize('') + self.P * len(sys.float_info))
# frame
import inspect
CO_MAXBLOCKS = 20
x = inspect.currentframe()
ncells = len(x.f_code.co_cellvars)
nfrees = len(x.f_code.co_freevars)
extras = x.f_code.co_stacksize + x.f_code.co_nlocals +\
ncells + nfrees - 1
check(x, vsize('4Pi2c4P3ic' + CO_MAXBLOCKS*'3i' + 'P' + extras*'P'))
localsplus = x.f_code.co_stacksize + x.f_code.co_nlocals +\
ncells + nfrees
check(x, vsize('8P3i3c' + localsplus*'P'))
# function
def func(): pass
check(func, size('14P'))