From 65f9c8e6dda177925346b8e846995cd5b1552167 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 25 Oct 2022 06:49:34 -0700
Subject: gh-93696: Locate frozen module source with __file__ (GH-93697)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
(cherry picked from commit d91de288e73c67805e4c838b5f770ab7ec3661f9)

Co-authored-by: James Gerity <snoopjedi@gmail.com>
---
 Lib/pdb.py                                         |  6 +++
 Lib/test/test_pdb.py                               | 46 ++++++++++++++++++++++
 .../2022-06-10-16-37-44.gh-issue-93696.65BI2R.rst  |  1 +
 3 files changed, 53 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2022-06-10-16-37-44.gh-issue-93696.65BI2R.rst

diff --git a/Lib/pdb.py b/Lib/pdb.py
index fe8ddd1..411ce53 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -1332,6 +1332,12 @@ class Pdb(bdb.Bdb, cmd.Cmd):
         if last is None:
             last = first + 10
         filename = self.curframe.f_code.co_filename
+        # gh-93696: stdlib frozen modules provide a useful __file__
+        # this workaround can be removed with the closure of gh-89815
+        if filename.startswith("<frozen"):
+            tmp = self.curframe.f_globals.get("__file__")
+            if isinstance(tmp, str):
+                filename = tmp
         breaklist = self.get_file_breaks(filename)
         try:
             lines = linecache.getlines(filename, self.curframe.f_globals)
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 55c3283..48f419e 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -2104,6 +2104,52 @@ def bœr():
         stdout, stderr = self.run_pdb_script(script, commands)
         self.assertFalse(stderr)
 
+    def test_gh_93696_frozen_list(self):
+        frozen_src = """
+        def func():
+            x = "Sentinel string for gh-93696"
+            print(x)
+        """
+        host_program = """
+        import os
+        import sys
+
+        def _create_fake_frozen_module():
+            with open('gh93696.py') as f:
+                src = f.read()
+
+            # this function has a co_filename as if it were in a frozen module
+            dummy_mod = compile(src, "<frozen gh93696>", "exec")
+            func_code = dummy_mod.co_consts[0]
+
+            mod = type(sys)("gh93696")
+            mod.func = type(lambda: None)(func_code, mod.__dict__)
+            mod.__file__ = 'gh93696.py'
+
+            return mod
+
+        mod = _create_fake_frozen_module()
+        mod.func()
+        """
+        commands = """
+            break 20
+            continue
+            step
+            list
+            quit
+        """
+        with open('gh93696.py', 'w') as f:
+            f.write(textwrap.dedent(frozen_src))
+
+        with open('gh93696_host.py', 'w') as f:
+            f.write(textwrap.dedent(host_program))
+
+        self.addCleanup(os_helper.unlink, 'gh93696.py')
+        self.addCleanup(os_helper.unlink, 'gh93696_host.py')
+        stdout, stderr = self._run_pdb(["gh93696_host.py"], commands)
+        # verify that pdb found the source of the "frozen" function
+        self.assertIn('x = "Sentinel string for gh-93696"', stdout, "Sentinel statement not found")
+
 class ChecklineTests(unittest.TestCase):
     def setUp(self):
         linecache.clearcache()  # Pdb.checkline() uses linecache.getline()
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-06-10-16-37-44.gh-issue-93696.65BI2R.rst b/Misc/NEWS.d/next/Core and Builtins/2022-06-10-16-37-44.gh-issue-93696.65BI2R.rst
new file mode 100644
index 0000000..8eadab0
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-06-10-16-37-44.gh-issue-93696.65BI2R.rst	
@@ -0,0 +1 @@
+Allow :mod:`pdb` to locate source for frozen modules in the standard library.
-- 
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