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gh-123165: correct tests for `dis.dis(func, show_positions=True)` by picnixz · Pull Request #123220 · python/cpython · GitHub

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gh-123165: correct tests for dis.dis(func, show_positions=True) #123220

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Merged
iritkatriel merged 2 commits into from
Aug 22, 2024
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gh-123165: correct tests for dis.dis(func, show_positions=True) #123220

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b3bc26f
fake positions on CPython implementations only
picnixz Aug 22, 2024
71f2048
simplify
picnixz Aug 22, 2024
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72 changes: 38 additions & 34 deletions Lib/test/test_dis.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
# Minimal tests for dis module

import ast
import contextlib
import dis
import functools
Expand Down Expand Up @@ -976,44 +977,47 @@ def format_instr_positions(instr):

@requires_debug_ranges()
def test_dis_with_some_positions(self):
def f():
pass
code = ("def f():\n"
" try: pass\n"
" finally:pass")
f = compile(ast.parse(code), "?", "exec").co_consts[0]

PY_CODE_LOCATION_INFO_NO_COLUMNS = 13
PY_CODE_LOCATION_INFO_WITH_COLUMNS = 14
PY_CODE_LOCATION_INFO_NO_LOCATION = 15

f.__code__ = f.__code__.replace(
co_stacksize=1,
co_firstlineno=42,
co_code=bytes([
dis.opmap["RESUME"], 0,
dis.opmap["NOP"], 0,
dis.opmap["RETURN_CONST"], 0,
]),
co_linetable=bytes([
(1 << 7)
| (PY_CODE_LOCATION_INFO_NO_COLUMNS << 3)
| (1 - 1), # 1 code unit (RESUME)
(1 << 1), # start line offset is 0 (encoded as an svarint)
(1 << 7)
| (PY_CODE_LOCATION_INFO_NO_LOCATION << 3)
| (1 - 1), # 1 code unit (NOP)
(1 << 7)
| (PY_CODE_LOCATION_INFO_WITH_COLUMNS << 3)
| (1 - 1), # 1 code unit (RETURN CONST)
(2 << 1), # start line offset is 0 (encoded as an svarint)
3, # end line offset is 0 (varint encoded)
1, # 1-based start column (reported as COL - 1)
5, # 1-based end column (reported as ENDCOL - 1)
]
))
expect = '\n'.join([
'43:?-43:? RESUME 0',
'1:0-1:0 RESUME 0',
'',
'2:3-3:15 NOP',
'',
'3:11-3:15 RETURN_CONST 0 (None)',
'',
' -- L1: PUSH_EXC_INFO',
'',
'3:11-3:15 RERAISE 0',
'',
' -- L2: COPY 3',
' -- POP_EXCEPT',
' -- RERAISE 1',
'ExceptionTable:',
' L1 to L2 -> L2 [1] lasti',
'',
' -- NOP',
])
self.do_disassembly_test(f, expect, show_positions=True)

@requires_debug_ranges()
def test_dis_with_linenos_but_no_columns(self):
code = "def f():\n\tx = 1"
tree = ast.parse(code)
func = tree.body[0]
ass_x = func.body[0].targets[0]
# remove columns information but keep line information
ass_x.col_offset = ass_x.end_col_offset = -1
f = compile(tree, "?", "exec").co_consts[0]

expect = '\n'.join([
'1:0-1:0 RESUME 0',
'',
'45:0-48:4 RETURN_CONST 0 (None)',
'2:5-2:6 LOAD_CONST 1 (1)',
'2:?-2:? STORE_FAST 0 (x)',
'2:?-2:? RETURN_CONST 0 (None)',
'',
])
self.do_disassembly_test(f, expect, show_positions=True)
Expand Down
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