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| author | Daisuke Nojiri <dnojiri@chromium.org> | 2019-05-28 18:24:42 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-11-06 22:11:55 +0000 |
| commit | 091a4b8b702a7cc686457efaebdc431e790b85d4 (patch) | |
| tree | a46c86c9d1784ec845a7f420825c79d0f96f9aee | |
| parent | 09fc255bb504d474ccfc93686c0da176fd2e2b32 (diff) | |
| download | chrome-ec-091a4b8b702a7cc686457efaebdc431e790b85d4.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>
(cherry picked from commit a5c17b44c506979a56cf7ebcaf03ef86f406a3c4)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1902097
Reviewed-by: Wai-Hong Tam <waihong@google.com>
Commit-Queue: Wai-Hong Tam <waihong@google.com>
Tested-by: Wai-Hong Tam <waihong@google.com>
| -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 dac0bf2f00..3293918dcb 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)) |