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Date: Wed, 25 May 2022 08:44:39 -0700
From: Daniel Latypov <dlatypov@...gle.com>
To: brendanhiggins@...gle.com, davidgow@...gle.com
Cc: ojeda@...nel.org, linux-kernel@...r.kernel.org,
kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
Daniel Latypov <dlatypov@...gle.com>
Subject: [RFC PATCH 1/4] rfc: kunit: remove format func from struct
kunit_assert, get it to 0 bytes
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@...gle.com>
---
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..aab5b1147df9 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 8ffcd7de9607..6730734a2216 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -509,9 +509,10 @@ 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; \
@@ -519,6 +520,7 @@ void kunit_do_failed_assertion(struct kunit *test,
&__loc, \
assert_type, \
&__assertion.assert, \
+ assert_format, \
fmt, \
##__VA_ARGS__); \
} \
@@ -530,7 +532,8 @@ 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__)
@@ -561,6 +564,7 @@ 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, \
@@ -618,8 +622,8 @@ 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, \
@@ -676,8 +680,8 @@ 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, \
@@ -696,6 +700,7 @@ 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 a5053a07409f..3845765e3a80 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -245,7 +245,7 @@ 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;
@@ -261,7 +261,7 @@ 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);
@@ -285,6 +285,7 @@ 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;
@@ -294,7 +295,7 @@ 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);
--
2.36.1.124.g0e6072fb45-goog
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