Commit bde5f5f8 authored by Philipp Stephani's avatar Philipp Stephani

Backport: Add module test for edge case.

This backports commit 6355a3ec from master.  Since the bug isn’t
present in emacs-27, just backport the test case.

* test/data/emacs-module/mod-test.c
(Fmod_test_invalid_store_copy): New test module function.
(emacs_module_init): Export it.

* test/src/emacs-module-tests.el
New unit test.
parent 4b3085a7
......@@ -296,6 +296,22 @@ Fmod_test_invalid_load (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
return invalid_stored_value;
/* The next function works in conjunction with the two previous ones.
It stows away a copy of the object created by
`Fmod_test_invalid_store' in a global reference. Module assertions
should still detect the invalid load of the local reference. */
static emacs_value global_copy_of_invalid_stored_value;
static emacs_value
Fmod_test_invalid_store_copy (emacs_env *env, ptrdiff_t nargs,
emacs_value *args, void *data)
emacs_value local = Fmod_test_invalid_store (env, 0, NULL, NULL);
return global_copy_of_invalid_stored_value
= env->make_global_ref (env, local);
/* An invalid finalizer: Finalizers are run during garbage collection,
where Lisp code can’t be executed. -module-assertions tests for
this case. */
......@@ -559,6 +575,8 @@ emacs_module_init (struct emacs_runtime *ert)
DEFUN ("mod-test-vector-fill", Fmod_test_vector_fill, 2, 2, NULL, NULL);
DEFUN ("mod-test-vector-eq", Fmod_test_vector_eq, 2, 2, NULL, NULL);
DEFUN ("mod-test-invalid-store", Fmod_test_invalid_store, 0, 0, NULL, NULL);
DEFUN ("mod-test-invalid-store-copy", Fmod_test_invalid_store_copy, 0, 0,
DEFUN ("mod-test-invalid-load", Fmod_test_invalid_load, 0, 0, NULL, NULL);
DEFUN ("mod-test-invalid-finalizer", Fmod_test_invalid_finalizer, 0, 0,
......@@ -270,6 +270,24 @@ must evaluate to a regular expression string."
(ert-deftest module--test-assertions--load-non-live-object-with-global-copy ()
"Check that -module-assertions verify that non-live objects aren't accessed.
This differs from `module--test-assertions-load-non-live-object'
in that it stows away a global reference. The module assertions
should nevertheless detect the invalid load."
(skip-unless (or (file-executable-p mod-test-emacs)
(and (eq system-type 'windows-nt)
(file-executable-p (concat mod-test-emacs ".exe")))))
;; This doesn't yet cause undefined behavior.
(should (eq (mod-test-invalid-store-copy) 123))
(module--test-assertion (rx "Emacs value not found in "
(+ digit) " values of "
(+ digit) " environments\n")
;; Storing and reloading a local value causes undefined behavior,
;; which should be detected by the module assertions.
(ert-deftest module--test-assertions--call-emacs-from-gc ()
"Check that -module-assertions prevents calling Emacs functions
during garbage collection."
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