Add test coverage for interpreter loop generator overridden insts

The interpreter generator has long supported giving it multiple bytecodes files where the latter files override opcodes defined in the earlier opcodes. This enables PEP 523 hook users to generate an interpreter loop using the existing opcodes and their own set of customizations. But there've been no test cases that validate this actually works.

This adds such a test case and fixes things up so this practically works. static functions used directly in the interpreter loop are moved into ceval.h. APIs which are used but not exported are marked as exported.

Linked PRs

gh-142913: Add test case for interpreter generator w/ overridden opco…

gh-142913: Update generated code that conflicted with other landed c…

gh-142913: Remove JIT interpreter for interpreter generator tests (GH…

gh-142913: Export JIT functions for _testinternalcapi (#143958)

The newly added test test_replaced_interpreter fails when re-run, like in all refleaks buildbot runs.

$ ./python -m test test_capi -R: -v -m test_replaced_interpreter
== CPython 3.15.0a5+ (heads/main:bb2b9ba49d8, Jan 19 2026, 13:38:43) [GCC 15.2.1 20251211 (Red Hat 15.2.1-5)]
== Linux-6.17.12-300.fc43.x86_64-x86_64-with-glibc2.42 little-endian
== Python build: debug
== cwd: /home/encukou/dev/cpython/build/test_python_worker_3768940æ
== CPU count: 18 (process) / 20 (system)
== encodings: locale=UTF-8 FS=utf-8
== resources: all test resources are disabled, use -u option to unskip tests

Using random seed: 826622625
0:00:00 load avg: 0.42 Run 1 test sequentially in a single process
0:00:00 load avg: 0.42 [1/1] test_capi
beginning 9 repetitions. Showing number of leaks (. for 0 or less, X for 10 or more)
12345:6789
test_replaced_interpreter (test.test_capi.test_misc.Test_Pep523API.test_replaced_interpreter) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
Xtest_replaced_interpreter (test.test_capi.test_misc.Test_Pep523API.test_replaced_interpreter) ... FAIL

======================================================================
FAIL: test_replaced_interpreter (test.test_capi.test_misc.Test_Pep523API.test_replaced_interpreter)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/encukou/dev/cpython/Lib/test/test_capi/test_misc.py", line 2875, in test_replaced_interpreter
    self.assertEqual(stats["resumes"], 5)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
AssertionError: 0 != 5

----------------------------------------------------------------------
Ran 1 test in 0.003s

FAILED (failures=1)
test test_capi failed
0:00:00 load avg: 0.42 [1/1/1] test_capi failed (1 failure)

== Tests result: FAILURE ==

1 test failed:
    test_capi

Total duration: 179 ms
Total tests: run=1 (filtered) failures=1
Total test files: run=1/1 (filtered) failed=1
Result: FAILURE

pythongh-142913: Revert adding test_replaced_interpreter

gh-142913: Revert adding test_replaced_interpreter (GH-144110)

I've removed the test for now to get the buildbots green again.

pythongh-142913: Add generated test files to gitattributes

gh-142913: Add generated test files to gitattributes (GH-144209)

pythongh-142913: Add test case for interpreter generator w/ overridde…

pythongh-142913: Update generated code that conflicted with other la…

pythongh-142913: Remove JIT interpreter for interpreter generator tes…

pythongh-142913: Export JIT functions for _testinternalcapi (python#1…

pythongh-142913: Revert adding test_replaced_interpreter (pythonGH-14…

pythongh-142913: Add generated test files to gitattributes (pythonGH-…

Navigation Menu

Repository navigation

Add test coverage for interpreter loop generator overridden insts #142913

Linked PRs

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Add test coverage for interpreter loop generator overridden insts #142913

Description

Linked PRs

Activity

encukou commented on Jan 19, 2026

encukou commented on Jan 22, 2026

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions