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gh-94816: Improve coverage of decode_linetable (GH-94853)

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This makes calls to co_lnotab to exercise this code, as well
as generating synthetically large code to exercise the corner
cases where line numbers need multiple bytes.

Automerge-Triggered-By: GH:brandtbucher
This commit is contained in:
Michael Droettboom 2022-07-14 17:34:50 -04:00 • committed by GitHub
parent 9b3f779209
commit 20b9d2a658
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1 changed files with 23 additions and 0 deletions
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23
Lib/test/test_code.py
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@ -17,6 +17,7 @@ cellvars: ('x',)
freevars: ()
nlocals: 2
flags: 3
lnotab: [4, 1, 10, 2]
consts: ('None', '<code object g>')
>>> dump(f(4).__code__)
@ -30,6 +31,7 @@ cellvars: ()
freevars: ('x',)
nlocals: 1
flags: 19
lnotab: [4, 1]
consts: ('None',)
>>> def h(x, y):
@ -50,6 +52,7 @@ cellvars: ()
freevars: ()
nlocals: 5
flags: 3
lnotab: [2, 1, 10, 1, 10, 1, 10, 1]
consts: ('None',)
>>> def attrs(obj):
@ -68,6 +71,7 @@ cellvars: ()
freevars: ()
nlocals: 1
flags: 3
lnotab: [2, 1, 46, 1, 46, 1]
consts: ('None',)
>>> def optimize_away():
@ -87,6 +91,7 @@ cellvars: ()
freevars: ()
nlocals: 0
flags: 3
lnotab: [2, 2, 2, 1, 2, 1]
consts: ("'doc string'", 'None')
>>> def keywordonly_args(a,b,*,k1):
@ -104,6 +109,7 @@ cellvars: ()
freevars: ()
nlocals: 3
flags: 3
lnotab: [2, 1]
consts: ('None',)
>>> def posonly_args(a,b,/,c):
@ -121,6 +127,7 @@ cellvars: ()
freevars: ()
nlocals: 3
flags: 3
lnotab: [2, 1]
consts: ('None',)
"""
@ -161,6 +168,7 @@ def dump(co):
"kwonlyargcount", "names", "varnames",
"cellvars", "freevars", "nlocals", "flags"]:
print("%s: %s" % (attr, getattr(co, "co_" + attr)))
print("lnotab:", list(co.co_lnotab))
print("consts:", tuple(consts(co.co_consts)))
# Needed for test_closure_injection below
@ -428,6 +436,21 @@ class CodeTest(unittest.TestCase):
self.assertIsNone(line)
self.assertEqual(end_line, new_code.co_firstlineno + 1)
def test_large_lnotab(self):
d = {}
lines = (
["def f():"] +
[""] * (1 << 17) +
[" pass"] * (1 << 17)
)
source = "\n".join(lines)
exec(source, d)
code = d["f"].__code__
expected = 1032 * [0, 127] + [0, 9] + ((1 << 17) - 1) * [2, 1]
expected[0] = 2
self.assertEqual(list(code.co_lnotab), expected)
def isinterned(s):
return s is sys.intern(('_' + s + '_')[1:-1])