e047c5eaa7
Add a simple way of redirecting calls to functions by including a special prologue in the "real" function which checks to see if the replacement function should be called (and, if so, calls it). To redirect calls to a function, make the first (non-declaration) line of the function: KUNIT_STATIC_STUB_REDIRECT(function_name, [function arguments]); (This will compile away to nothing if KUnit is not enabled, otherwise it will check if a redirection is active, call the replacement function, and return. This check is protected by a static branch, so has very little overhead when there are no KUnit tests running.) Calls to the real function can be redirected to a replacement using: kunit_activate_static_stub(test, real_fn, replacement_fn); The redirection will only affect calls made from within the kthread of the current test, and will be automatically disabled when the test completes. It can also be manually disabled with kunit_deactivate_static_stub(). The 'example' KUnit test suite has a more complete example. Co-developed-by: Daniel Latypov <dlatypov@google.com> Signed-off-by: Daniel Latypov <dlatypov@google.com> Signed-off-by: David Gow <davidgow@google.com> Reviewed-by: Brendan Higgins <brendanhiggins@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
30 lines
885 B
C
30 lines
885 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Declarations for hook implementations.
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*
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* These will be set as the function pointers in struct kunit_hook_table,
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* found in include/kunit/test-bug.h.
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*
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* Copyright (C) 2023, Google LLC.
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* Author: David Gow <davidgow@google.com>
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*/
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#ifndef _KUNIT_HOOKS_IMPL_H
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#define _KUNIT_HOOKS_IMPL_H
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#include <kunit/test-bug.h>
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/* List of declarations. */
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void __kunit_fail_current_test_impl(const char *file, int line, const char *fmt, ...);
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void *__kunit_get_static_stub_address_impl(struct kunit *test, void *real_fn_addr);
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/* Code to set all of the function pointers. */
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static inline void kunit_install_hooks(void)
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{
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/* Install the KUnit hook functions. */
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kunit_hooks.fail_current_test = __kunit_fail_current_test_impl;
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kunit_hooks.get_static_stub_address = __kunit_get_static_stub_address_impl;
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}
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#endif /* _KUNIT_HOOKS_IMPL_H */
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