On Sat, Oct 1, 2022 at 8:26 AM Daniel Latypov <dlatypov@xxxxxxxxxx> wrote: > > Each calll to a KUNIT_EXPECT_*() macro creates a local variable which > contains a struct kunit_assert. > > Normally, we'd hope the compiler would be able to optimize this away, > but we've seen cases where it hasn't, see > https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/GbrMNej2BAAJ. > > In changes like commit 21957f90b28f ("kunit: split out part of > kunit_assert into a static const"), we've moved more and more parts out > of struct kunit_assert and its children types (kunit_binary_assert). > > This patch removes the final field and gets us to: > sizeof(struct kunit_assert) == 0 > sizeof(struct kunit_binary_assert) == 24 (on UML x86_64). > > This also reduces the amount of macro plumbing going on at the cost of > passing in one more arg to the base KUNIT_ASSERTION macro and > kunit_do_failed_assertion(). > > Signed-off-by: Daniel Latypov <dlatypov@xxxxxxxxxx> > --- Very glad to see this finally happening: we've definitely still been seeing these stack size warnings, so reducing the stack use is good And as someone who has always been a little uneasy with the number of nested macros, the simplification is also a big win. Reviewed-by: David Gow <davidgow@xxxxxxxxxx> Cheers, -- David > include/kunit/assert.h | 28 ++++++---------------------- > include/kunit/test.h | 17 +++++++++++------ > lib/kunit/test.c | 7 ++++--- > 3 files changed, 21 insertions(+), 31 deletions(-) > > diff --git a/include/kunit/assert.h b/include/kunit/assert.h > index 4b52e12c2ae8..ace3de8d1ee7 100644 > --- a/include/kunit/assert.h > +++ b/include/kunit/assert.h > @@ -42,16 +42,15 @@ struct kunit_loc { > > /** > * struct kunit_assert - Data for printing a failed assertion or expectation. > - * @format: a function which formats the data in this kunit_assert to a string. > * > * Represents a failed expectation/assertion. Contains all the data necessary to > * format a string to a user reporting the failure. > */ > -struct kunit_assert { > - void (*format)(const struct kunit_assert *assert, > - const struct va_format *message, > - struct string_stream *stream); > -}; > +struct kunit_assert {}; > + > +typedef void (*assert_format_t)(const struct kunit_assert *assert, > + const struct va_format *message, > + struct string_stream *stream); > > void kunit_assert_prologue(const struct kunit_loc *loc, > enum kunit_assert_type type, > @@ -71,16 +70,6 @@ void kunit_fail_assert_format(const struct kunit_assert *assert, > const struct va_format *message, > struct string_stream *stream); > > -/** > - * KUNIT_INIT_FAIL_ASSERT_STRUCT - Initializer for &struct kunit_fail_assert. > - * > - * Initializes a &struct kunit_fail_assert. Intended to be used in > - * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros. > - */ > -#define KUNIT_INIT_FAIL_ASSERT_STRUCT { \ > - .assert = { .format = kunit_fail_assert_format }, \ > -} > - > /** > * struct kunit_unary_assert - Represents a KUNIT_{EXPECT|ASSERT}_{TRUE|FALSE} > * @assert: The parent of this type. > @@ -110,7 +99,6 @@ void kunit_unary_assert_format(const struct kunit_assert *assert, > * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros. > */ > #define KUNIT_INIT_UNARY_ASSERT_STRUCT(cond, expect_true) { \ > - .assert = { .format = kunit_unary_assert_format }, \ > .condition = cond, \ > .expected_true = expect_true \ > } > @@ -145,7 +133,6 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, > * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros. > */ > #define KUNIT_INIT_PTR_NOT_ERR_STRUCT(txt, val) { \ > - .assert = { .format = kunit_ptr_not_err_assert_format }, \ > .text = txt, \ > .value = val \ > } > @@ -190,7 +177,6 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, > * KUNIT_INIT_BINARY_ASSERT_STRUCT() - Initializes a binary assert like > * kunit_binary_assert, kunit_binary_ptr_assert, etc. > * > - * @format_func: a function which formats the assert to a string. > * @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. > @@ -200,11 +186,9 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, > * 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(format_func, \ > - text_, \ > +#define KUNIT_INIT_BINARY_ASSERT_STRUCT(text_, \ > left_val, \ > right_val) { \ > - .assert = { .format = format_func }, \ > .text = text_, \ > .left_value = left_val, \ > .right_value = right_val \ > diff --git a/include/kunit/test.h b/include/kunit/test.h > index 840a2c375065..3476549106f7 100644 > --- a/include/kunit/test.h > +++ b/include/kunit/test.h > @@ -472,9 +472,10 @@ void kunit_do_failed_assertion(struct kunit *test, > const struct kunit_loc *loc, > enum kunit_assert_type type, > const struct kunit_assert *assert, > + assert_format_t assert_format, > const char *fmt, ...); > > -#define KUNIT_ASSERTION(test, assert_type, pass, assert_class, INITIALIZER, fmt, ...) do { \ > +#define KUNIT_ASSERTION(test, assert_type, pass, assert_class, assert_format, INITIALIZER, fmt, ...) do { \ > if (unlikely(!(pass))) { \ > static const struct kunit_loc __loc = KUNIT_CURRENT_LOC; \ > struct assert_class __assertion = INITIALIZER; \ > @@ -482,6 +483,7 @@ void kunit_do_failed_assertion(struct kunit *test, > &__loc, \ > assert_type, \ > &__assertion.assert, \ > + assert_format, \ > fmt, \ > ##__VA_ARGS__); \ > } \ > @@ -493,7 +495,8 @@ void kunit_do_failed_assertion(struct kunit *test, > assert_type, \ > false, \ > kunit_fail_assert, \ > - KUNIT_INIT_FAIL_ASSERT_STRUCT, \ > + kunit_fail_assert_format, \ > + {}, \ > fmt, \ > ##__VA_ARGS__) > > @@ -524,6 +527,7 @@ void kunit_do_failed_assertion(struct kunit *test, > assert_type, \ > !!(condition) == !!expected_true, \ > kunit_unary_assert, \ > + kunit_unary_assert_format, \ > KUNIT_INIT_UNARY_ASSERT_STRUCT(#condition, \ > expected_true), \ > fmt, \ > @@ -581,8 +585,8 @@ do { \ > assert_type, \ > __left op __right, \ > assert_class, \ > - KUNIT_INIT_BINARY_ASSERT_STRUCT(format_func, \ > - &__text, \ > + format_func, \ > + KUNIT_INIT_BINARY_ASSERT_STRUCT(&__text, \ > __left, \ > __right), \ > fmt, \ > @@ -639,8 +643,8 @@ do { \ > assert_type, \ > strcmp(__left, __right) op 0, \ > kunit_binary_str_assert, \ > - KUNIT_INIT_BINARY_ASSERT_STRUCT(kunit_binary_str_assert_format,\ > - &__text, \ > + kunit_binary_str_assert_format, \ > + KUNIT_INIT_BINARY_ASSERT_STRUCT(&__text, \ > __left, \ > __right), \ > fmt, \ > @@ -659,6 +663,7 @@ do { \ > assert_type, \ > !IS_ERR_OR_NULL(__ptr), \ > kunit_ptr_not_err_assert, \ > + kunit_ptr_not_err_assert_format, \ > KUNIT_INIT_PTR_NOT_ERR_STRUCT(#ptr, \ > __ptr), \ > fmt, \ > diff --git a/lib/kunit/test.c b/lib/kunit/test.c > index b73d5bb5c473..53bf1793f915 100644 > --- a/lib/kunit/test.c > +++ b/lib/kunit/test.c > @@ -247,7 +247,7 @@ static void kunit_print_string_stream(struct kunit *test, > > static void kunit_fail(struct kunit *test, const struct kunit_loc *loc, > enum kunit_assert_type type, const struct kunit_assert *assert, > - const struct va_format *message) > + assert_format_t assert_format, const struct va_format *message) > { > struct string_stream *stream; > > @@ -263,7 +263,7 @@ static void kunit_fail(struct kunit *test, const struct kunit_loc *loc, > } > > kunit_assert_prologue(loc, type, stream); > - assert->format(assert, message, stream); > + assert_format(assert, message, stream); > > kunit_print_string_stream(test, stream); > > @@ -287,6 +287,7 @@ void kunit_do_failed_assertion(struct kunit *test, > const struct kunit_loc *loc, > enum kunit_assert_type type, > const struct kunit_assert *assert, > + assert_format_t assert_format, > const char *fmt, ...) > { > va_list args; > @@ -296,7 +297,7 @@ void kunit_do_failed_assertion(struct kunit *test, > message.fmt = fmt; > message.va = &args; > > - kunit_fail(test, loc, type, assert, &message); > + kunit_fail(test, loc, type, assert, assert_format, &message); > > va_end(args); > > -- > 2.38.0.rc1.362.ged0d419d3c-goog >
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