Enable dis Bytecode iteration

Author: steve-s

graalpython/com.oracle.graal.python.test/src/tests/test_dis.py

@@ -0,0 +1,48 @@
+# Copyright (c) 2026, 2026, Oracle and/or its affiliates. All rights reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
+# The Universal Permissive License (UPL), Version 1.0
+#
+# Subject to the condition set forth below, permission is hereby granted to any
+# person obtaining a copy of this software, associated documentation and/or
+# data (collectively the "Software"), free of charge and under any and all
+# copyright rights in the Software, and any and all patent rights owned or
+# freely licensable by each licensor hereunder covering either (i) the
+# unmodified Software as contributed to or provided by such licensor, or (ii)
+# the Larger Works (as defined below), to deal in both
+#
+# (a) the Software, and
+#
+# (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+# one is included with the Software each a "Larger Work" to which the Software
+# is contributed by such licensors),
+#
+# without restriction, including without limitation the rights to copy, create
+# derivative works of, display, perform, and distribute the Software and make,
+# use, sell, offer for sale, import, export, have made, and have sold the
+# Software and the Larger Work(s), and to sublicense the foregoing rights on
+# either these or other terms.
+#
+# This license is subject to the following condition:
+#
+# The above copyright notice and either this complete permission notice or at a
+# minimum a reference to the UPL must be included in all copies or substantial
+# portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+import dis
+
+
+def bytecode_target(value):
+    return value + 1
+
+
+def test_bytecode_iteration_does_not_fail():
+    for _ in dis.Bytecode(bytecode_target):
+        pass

graalpython/lib-python/3/dis.py

@@ -734,8 +734,6 @@ class Bytecode:
     Iterating over this yields the bytecode operations as Instruction instances.
     """
     def __init__(self, x, *, first_line=None, current_offset=None, show_caches=False, adaptive=False):
-        # GraalPy change
-        raise NotImplementedError("'dis' module is not supported on GraalPy")
         self.codeobj = co = _get_code_object(x)
         if first_line is None:
             self.first_line = co.co_firstlineno
@@ -746,14 +744,15 @@ def __init__(self, x, *, first_line=None, current_offset=None, show_caches=False
         self._linestarts = dict(findlinestarts(co))
         self._original_object = x
         self.current_offset = current_offset
-        self.exception_entries = _parse_exception_table(co)
+        # GraalPy change:
+        self.exception_entries = []
         self.show_caches = show_caches
         self.adaptive = adaptive
 
     def __iter__(self):
         co = self.codeobj
         return _get_instructions_bytes(_get_code_array(co, self.adaptive),
-                                       co._varname_from_oparg,
+                                       None, # GraalPy change: replaced co._varname_from_oparg
                                        co.co_names, co.co_consts,
                                        self._linestarts,
                                        line_offset=self._line_offset,
@@ -780,6 +779,8 @@ def info(self):
 
     def dis(self):
         """Return a formatted view of the bytecode operations."""
+        # GraalPy change:
+        raise NotImplementedError("'dis' module is not supported on GraalPy")
         co = self.codeobj
         if self.current_offset is not None:
             offset = self.current_offset