From 88ff49f3c0994356baa3760e19524a250b6f48ab Mon Sep 17 00:00:00 2001
From: Brandt Bucher <brandtbucher@gmail.com>
Date: Fri, 6 May 2022 09:40:35 -0700
Subject: [PATCH 1/3] Move CACHE handling into _unpack_opargs

---
 Lib/dis.py | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/Lib/dis.py b/Lib/dis.py
index 53c62694decaa0..7fae5b934ef37b 100644
--- a/Lib/dis.py
+++ b/Lib/dis.py
@@ -1,5 +1,6 @@
 """Disassembler of Python byte code into mnemonics."""
 
+from distutils.command.build_ext import extension_name_re
 import sys
 import types
 import collections
@@ -440,11 +441,7 @@ def _get_instructions_bytes(code, varname_from_oparg=None,
         for i in range(start, end):
             labels.add(target)
     starts_line = None
-    cache_counter = 0
     for offset, op, arg in _unpack_opargs(code):
-        if cache_counter > 0:
-            cache_counter -= 1
-            continue
         if linestarts is not None:
             starts_line = linestarts.get(offset, None)
             if starts_line is not None:
@@ -454,7 +451,6 @@ def _get_instructions_bytes(code, varname_from_oparg=None,
         argrepr = ''
         positions = Positions(*next(co_positions, ()))
         deop = _deoptop(op)
-        cache_counter = _inline_cache_entries[deop]
         if arg is not None:
             #  Set argval to the dereferenced value of the argument when
             #  available, and argrepr to the string representation of argval.
@@ -497,7 +493,7 @@ def _get_instructions_bytes(code, varname_from_oparg=None,
         yield Instruction(_all_opname[op], op,
                           arg, argval, argrepr,
                           offset, starts_line, is_jump_target, positions)
-        if show_caches and cache_counter:
+        if show_caches and _inline_cache_entries[deop]:
             for name, caches in _cache_format[opname[deop]].items():
                 data = code[offset + 2: offset + 2 + caches * 2]
                 argrepr = f"{name}: {int.from_bytes(data, sys.byteorder)}"
@@ -586,9 +582,16 @@ def _disassemble_str(source, **kwargs):
 
 def _unpack_opargs(code):
     extended_arg = 0
+    caches = 0
     for i in range(0, len(code), 2):
+        # Skip inline CACHE entries:
+        if caches:
+            caches -= 1
+            continue
         op = code[i]
-        if _deoptop(op) >= HAVE_ARGUMENT:
+        deop = _deoptop(op)
+        caches = _inline_cache_entries[deop]
+        if deop >= HAVE_ARGUMENT:
             arg = code[i+1] | extended_arg
             extended_arg = (arg << 8) if op == EXTENDED_ARG else 0
             # The oparg is stored as a signed integer

From 9605dd056d4d1149672e91881487ff2678566568 Mon Sep 17 00:00:00 2001
From: Brandt Bucher <brandtbucher@gmail.com>
Date: Fri, 6 May 2022 09:44:05 -0700
Subject: [PATCH 2/3] Remove auto-added import

---
 Lib/dis.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/Lib/dis.py b/Lib/dis.py
index 7fae5b934ef37b..046013120b000d 100644
--- a/Lib/dis.py
+++ b/Lib/dis.py
@@ -1,6 +1,5 @@
 """Disassembler of Python byte code into mnemonics."""
 
-from distutils.command.build_ext import extension_name_re
 import sys
 import types
 import collections

From 20a8e09197e2d22acb57f377cf6199d757a39975 Mon Sep 17 00:00:00 2001
From: Brandt Bucher <brandtbucher@gmail.com>
Date: Fri, 6 May 2022 09:48:22 -0700
Subject: [PATCH 3/3] blurb add

---
 .../next/Library/2022-05-06-09-48-07.gh-issue-90997.4PmCgX.rst  | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2022-05-06-09-48-07.gh-issue-90997.4PmCgX.rst

diff --git a/Misc/NEWS.d/next/Library/2022-05-06-09-48-07.gh-issue-90997.4PmCgX.rst b/Misc/NEWS.d/next/Library/2022-05-06-09-48-07.gh-issue-90997.4PmCgX.rst
new file mode 100644
index 00000000000000..0e683070806c2a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-05-06-09-48-07.gh-issue-90997.4PmCgX.rst
@@ -0,0 +1,2 @@
+Fix an issue where :mod:`dis` utilities may interpret populated inline cache
+entries as valid instructions.