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| author | Daisuke Nojiri <dnojiri@chromium.org> | 2019-05-28 18:24:42 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-11-10 17:09:14 +0000 |
| commit | 42ec4b822e58fb70e38f073fa430ac23c1cd47c9 (patch) | |
| tree | f568b254e22c5d1bbf6d2d600385912ad3bee6e0 | |
| parent | 6f40163f420b5fba3a6e1ebff095c58ce00b7ee0 (diff) | |
| download | chrome-ec-42ec4b822e58fb70e38f073fa430ac23c1cd47c9.tar.gz | |
common: Define markers for weak symbols
This patch introduces macros to mark weak symbols. These macros are
used to annotate weak definitions, declarations, and overriding
definitions.
__override_proto: declarations
__override: definitions which take precedence
__overridable: default (weak) definitions
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
BUG=chromium.org/964060
BRANCH=none
TEST=buildall
Change-Id: I44cec41e0523e285db19a890d084b52337f64a9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1633911
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Denis Brockus <dbrockus@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Denis Brockus <dbrockus@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3272354
Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
| -rw-r--r-- | include/common.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h index bc1da44433..9aa5d0ea00 100644 --- a/include/common.h +++ b/include/common.h @@ -215,6 +215,33 @@ enum ec_error_list { #define test_export_static static #endif +/* + * Weak symbol markers + * + * These macros are used to annotate weak definitions, their declarations, and + * overriding definitions. + * + * __override_proto: declarations + * __override: definitions which take precedence + * __overridable: default (weak) definitions + * + * For example, in foo.h: + * __override_proto void foo(void); + * + * and in foo.c: + * __overridable void foo(void) { + * ... + * } + * + * and in board.c: + * __override void foo(void) { + * ... + * } + */ +#define __override_proto +#define __override +#define __overridable __attribute__((weak)) + /* find the most significant bit. Not defined in n == 0. */ #define __fls(n) (31 - __builtin_clz(n)) |