diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index ed5ddf95069e35..e8ff4b5a28f55f 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -4,6 +4,7 @@
from io import StringIO
import linecache
import sys
+import types
import inspect
import unittest
import re
@@ -1129,7 +1130,7 @@ def test_print_exception_bad_type_python(self):
class BaseExceptionReportingTests:
def get_exception(self, exception_or_callable):
- if isinstance(exception_or_callable, Exception):
+ if isinstance(exception_or_callable, BaseException):
return exception_or_callable
try:
exception_or_callable()
@@ -1851,6 +1852,31 @@ def exc():
report = self.get_report(exc)
self.assertEqual(report, expected)
+ def test_KeyboardInterrupt_at_first_line_of_frame(self):
+ # see GH-93249
+ def f():
+ return sys._getframe()
+
+ tb_next = None
+ frame = f()
+ lasti = 0
+ lineno = f.__code__.co_firstlineno
+ tb = types.TracebackType(tb_next, frame, lasti, lineno)
+
+ exc = KeyboardInterrupt()
+ exc.__traceback__ = tb
+
+ expected = (f'Traceback (most recent call last):\n'
+ f' File "{__file__}", line {lineno}, in f\n'
+ f' def f():\n'
+ f'\n'
+ f'KeyboardInterrupt\n')
+
+ report = self.get_report(exc)
+ # remove trailing writespace:
+ report = '\n'.join([l.rstrip() for l in report.split('\n')])
+ self.assertEqual(report, expected)
+
class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
#
diff --git a/Objects/codeobject.c b/Objects/codeobject.c
index c2b29be1fe8693..dd3f555e024e0e 100644
--- a/Objects/codeobject.c
+++ b/Objects/codeobject.c
@@ -768,6 +768,11 @@ next_code_delta(PyCodeAddressRange *bounds)
static int
previous_code_delta(PyCodeAddressRange *bounds)
{
+ if (bounds->ar_start == 0) {
+ // If we looking at the first entry, the
+ // "previous" entry has an implicit length of 1.
+ return 1;
+ }
const uint8_t *ptr = bounds->opaque.lo_next-1;
while (((*ptr) & 128) == 0) {
ptr--;
@@ -811,7 +816,7 @@ static void
retreat(PyCodeAddressRange *bounds)
{
ASSERT_VALID_BOUNDS(bounds);
- assert(bounds->ar_start > 0);
+ assert(bounds->ar_start >= 0);
do {
bounds->opaque.lo_next--;
} while (((*bounds->opaque.lo_next) & 128) == 0);
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