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kunit: remove format func from struct kunit_assert, get it to 0 bytes

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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 21957f90b2 ("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@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Daniel Latypov 2022-09-30 17:26:35 -07:00 committed by Shuah Khan
parent 3c4fc7bf4c
commit a8495ad8e9
3 changed files with 21 additions and 31 deletions
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28
include/kunit/assert.h
View file

@ -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 \

17
include/kunit/test.h
View file

@ -473,9 +473,10 @@ 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; \
@ -483,6 +484,7 @@ void kunit_do_failed_assertion(struct kunit *test,
&__loc, \
assert_type, \
&__assertion.assert, \
assert_format, \
fmt, \
##__VA_ARGS__); \
} \
@ -494,7 +496,8 @@ 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__)
@ -525,6 +528,7 @@ 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, \
@ -582,8 +586,8 @@ 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, \
@ -640,8 +644,8 @@ 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, \
@ -660,6 +664,7 @@ 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, \

7
lib/kunit/test.c
View file

@ -258,7 +258,7 @@ 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;
@ -274,7 +274,7 @@ 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);
@ -298,6 +298,7 @@ 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;
@ -307,7 +308,7 @@ 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);