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[3.12] gh-105658: fix excess trace events for except block ending with a conditional block (#109384) #109411

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Sep 14, 2023
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[3.12] gh-105658: fix excess trace events for except block ending with a conditional block (#109384) #109411

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31 changes: 30 additions & 1 deletion Lib/test/test_sys_settrace.py
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Original file line number Diff line number Diff line change
Expand Up @@ -921,6 +921,35 @@ def func():
(6, 'line'),
(6, 'return')])

def test_finally_with_conditional(self):

# See gh-105658
condition = True
def func():
try:
try:
raise Exception
finally:
if condition:
result = 1
result = 2
except:
result = 3
return result

self.run_and_compare(func,
[(0, 'call'),
(1, 'line'),
(2, 'line'),
(3, 'line'),
(3, 'exception'),
(5, 'line'),
(6, 'line'),
(8, 'line'),
(9, 'line'),
(10, 'line'),
(10, 'return')])

def test_break_to_continue1(self):

def func():
Expand Down Expand Up @@ -2092,7 +2121,7 @@ def test_jump_in_nested_finally_3(output):
output.append(11)
output.append(12)

@jump_test(5, 11, [2, 4], (ValueError, 'exception'))
@jump_test(5, 11, [2, 4], (ValueError, 'comes after the current code block'))
def test_no_jump_over_return_try_finally_in_finally_block(output):
try:
output.append(2)
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2023-09-13-19-16-51.gh-issue-105658.z2nR2u.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix bug where the line trace of an except block ending with a conditional
includes an excess event with the line of the conditional expression.
16 changes: 2 additions & 14 deletions Python/compile.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3184,18 +3184,6 @@ compiler_continue(struct compiler *c, location loc)
}


static location
location_of_last_executing_statement(asdl_stmt_seq *stmts)
{
for (Py_ssize_t i = asdl_seq_LEN(stmts) - 1; i >= 0; i++) {
location loc = LOC((stmt_ty)asdl_seq_GET(stmts, i));
if (loc.lineno > 0) {
return loc;
}
}
return NO_LOCATION;
}

/* Code generated for "try: <body> finally: <finalbody>" is as follows:

SETUP_FINALLY L
Expand Down Expand Up @@ -3264,9 +3252,9 @@ compiler_try_finally(struct compiler *c, stmt_ty s)
RETURN_IF_ERROR(
compiler_push_fblock(c, loc, FINALLY_END, end, NO_LABEL, NULL));
VISIT_SEQ(c, stmt, s->v.Try.finalbody);
loc = location_of_last_executing_statement(s->v.Try.finalbody);
compiler_pop_fblock(c, FINALLY_END, end);

loc = NO_LOCATION;
ADDOP_I(c, loc, RERAISE, 0);

USE_LABEL(c, cleanup);
Expand Down Expand Up @@ -3315,9 +3303,9 @@ compiler_try_star_finally(struct compiler *c, stmt_ty s)
compiler_push_fblock(c, loc, FINALLY_END, end, NO_LABEL, NULL));

VISIT_SEQ(c, stmt, s->v.TryStar.finalbody);
loc = location_of_last_executing_statement(s->v.Try.finalbody);

compiler_pop_fblock(c, FINALLY_END, end);
loc = NO_LOCATION;
ADDOP_I(c, loc, RERAISE, 0);

USE_LABEL(c, cleanup);
Expand Down
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