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Message-ID: <CABVgOSnunybuq-G5hXA-tms5nUwwEWwPpHrK=zgRfdzC6Y_wuQ@mail.gmail.com>
Date: Sat, 1 Oct 2022 11:26:46 +0800
From: David Gow <davidgow@...gle.com>
To: Daniel Latypov <dlatypov@...gle.com>
Cc: Brendan Higgins <brendanhiggins@...gle.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
KUnit Development <kunit-dev@...glegroups.com>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@...r.kernel.org>,
Shuah Khan <skhan@...uxfoundation.org>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: Re: [PATCH 3/4] kunit: eliminate KUNIT_INIT_*_ASSERT_STRUCT macros
On Sat, Oct 1, 2022 at 8:26 AM Daniel Latypov <dlatypov@...gle.com> wrote:
>
> These macros exist because passing an initializer list to other macros
> is hard.
>
> The goal of these macros is to generate a line like
> struct $ASSERT_TYPE __assertion = $APPROPRIATE_INITIALIZER;
> e.g.
> struct kunit_unary_assertion __assertion = {
> .condition = "foo()",
> .expected_true = true
> };
>
> But the challenge is you can't pass `{.condition=..., .expect_true=...}`
> as a macro argument, since the comma means you're actually passing two
> arguments, `{.condition=...` and `.expect_true=....}`.
> So we'd made custom macros for each different initializer-list shape.
>
> But we can work around this with the following generic macro
> #define KUNIT_INIT_ASSERT(initializers...) { initializers }
>
> Note: this has the downside that we have to rename some macros arguments
> to not conflict with the struct field names (e.g. `expected_true`).
> It's a bit gross, but probably worth reducing the # of macros.
>
> Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
> ---
I agree with you on both fronts here: this is 'a bit gross', and is
also 'worth it'.
Reviewed-by: David Gow <davidgow@...gle.com>
Cheers,
-- David
> include/kunit/assert.h | 48 ------------------------------------------
> include/kunit/test.h | 27 +++++++++++++-----------
> 2 files changed, 15 insertions(+), 60 deletions(-)
>
> diff --git a/include/kunit/assert.h b/include/kunit/assert.h
> index ace3de8d1ee7..01b191fa17c3 100644
> --- a/include/kunit/assert.h
> +++ b/include/kunit/assert.h
> @@ -90,19 +90,6 @@ void kunit_unary_assert_format(const struct kunit_assert *assert,
> const struct va_format *message,
> struct string_stream *stream);
>
> -/**
> - * KUNIT_INIT_UNARY_ASSERT_STRUCT() - Initializes &struct kunit_unary_assert.
> - * @cond: A string representation of the expression asserted true or false.
> - * @expect_true: True if of type KUNIT_{EXPECT|ASSERT}_TRUE, false otherwise.
> - *
> - * Initializes a &struct kunit_unary_assert. Intended to be used in
> - * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros.
> - */
> -#define KUNIT_INIT_UNARY_ASSERT_STRUCT(cond, expect_true) { \
> - .condition = cond, \
> - .expected_true = expect_true \
> -}
> -
> /**
> * struct kunit_ptr_not_err_assert - An expectation/assertion that a pointer is
> * not NULL and not a -errno.
> @@ -123,20 +110,6 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert,
> const struct va_format *message,
> struct string_stream *stream);
>
> -/**
> - * KUNIT_INIT_PTR_NOT_ERR_ASSERT_STRUCT() - Initializes a
> - * &struct kunit_ptr_not_err_assert.
> - * @txt: A string representation of the expression passed to the expectation.
> - * @val: The actual evaluated pointer value of the expression.
> - *
> - * Initializes a &struct kunit_ptr_not_err_assert. Intended to be used in
> - * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros.
> - */
> -#define KUNIT_INIT_PTR_NOT_ERR_STRUCT(txt, val) { \
> - .text = txt, \
> - .value = val \
> -}
> -
> /**
> * struct kunit_binary_assert_text - holds strings for &struct
> * kunit_binary_assert and friends to try and make the structs smaller.
> @@ -173,27 +146,6 @@ void kunit_binary_assert_format(const struct kunit_assert *assert,
> const struct va_format *message,
> struct string_stream *stream);
>
> -/**
> - * KUNIT_INIT_BINARY_ASSERT_STRUCT() - Initializes a binary assert like
> - * kunit_binary_assert, kunit_binary_ptr_assert, etc.
> - *
> - * @text_: Pointer to a kunit_binary_assert_text.
> - * @left_val: The actual evaluated value of the expression in the left slot.
> - * @right_val: The actual evaluated value of the expression in the right slot.
> - *
> - * Initializes a binary assert like kunit_binary_assert,
> - * kunit_binary_ptr_assert, etc. This relies on these structs having the same
> - * fields but with different types for left_val/right_val.
> - * This is ultimately used by binary assertion macros like KUNIT_EXPECT_EQ, etc.
> - */
> -#define KUNIT_INIT_BINARY_ASSERT_STRUCT(text_, \
> - left_val, \
> - right_val) { \
> - .text = text_, \
> - .left_value = left_val, \
> - .right_value = right_val \
> -}
> -
> /**
> * struct kunit_binary_ptr_assert - An expectation/assertion that compares two
> * pointer values (for example, KUNIT_EXPECT_PTR_EQ(test, foo, bar)).
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index fec437c8a2b7..e49348bbc6ee 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -514,22 +514,25 @@ void kunit_do_failed_assertion(struct kunit *test,
> fmt, \
> ##__VA_ARGS__)
>
> +/* Helper to safely pass around an initializer list to other macros. */
> +#define KUNIT_INIT_ASSERT(initializers...) { initializers }
> +
> #define KUNIT_UNARY_ASSERTION(test, \
> assert_type, \
> - condition, \
> - expected_true, \
> + condition_, \
> + expected_true_, \
> fmt, \
> ...) \
> do { \
> - if (likely(!!(condition) == !!expected_true)) \
> + if (likely(!!(condition_) == !!expected_true_)) \
> break; \
> \
> _KUNIT_FAILED(test, \
> assert_type, \
> kunit_unary_assert, \
> kunit_unary_assert_format, \
> - KUNIT_INIT_UNARY_ASSERT_STRUCT(#condition, \
> - expected_true), \
> + KUNIT_INIT_ASSERT(.condition = #condition_, \
> + .expected_true = expected_true_), \
> fmt, \
> ##__VA_ARGS__); \
> } while (0)
> @@ -589,9 +592,9 @@ do { \
> assert_type, \
> assert_class, \
> format_func, \
> - KUNIT_INIT_BINARY_ASSERT_STRUCT(&__text, \
> - __left, \
> - __right), \
> + KUNIT_INIT_ASSERT(.text = &__text, \
> + .left_value = __left, \
> + .right_value = __right), \
> fmt, \
> ##__VA_ARGS__); \
> } while (0)
> @@ -650,9 +653,9 @@ do { \
> assert_type, \
> kunit_binary_str_assert, \
> kunit_binary_str_assert_format, \
> - KUNIT_INIT_BINARY_ASSERT_STRUCT(&__text, \
> - __left, \
> - __right), \
> + KUNIT_INIT_ASSERT(.text = &__text, \
> + .left_value = __left, \
> + .right_value = __right), \
> fmt, \
> ##__VA_ARGS__); \
> } while (0)
> @@ -672,7 +675,7 @@ do { \
> assert_type, \
> kunit_ptr_not_err_assert, \
> kunit_ptr_not_err_assert_format, \
> - KUNIT_INIT_PTR_NOT_ERR_STRUCT(#ptr, __ptr), \
> + KUNIT_INIT_ASSERT(.text = #ptr, .value = __ptr), \
> fmt, \
> ##__VA_ARGS__); \
> } while (0)
> --
> 2.38.0.rc1.362.ged0d419d3c-goog
>
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