diff options
| author | Julius Werner <jwerner@chromium.org> | 2013-12-09 17:46:22 -0800 |
|---|---|---|
| committer | Isaac Christensen <isaac.christensen@se-eng.com> | 2014-09-22 18:42:20 +0200 |
| commit | 03784fa97a764be81ca9bcf79222e7b37e2e7692 (patch) | |
| tree | 600c7de6cf1c27c3f117bf80bcd52c9e36785faa /src/include/stddef.h | |
| parent | c505837e67aa4fb89964c849d905fa8d44459152 (diff) | |
Add check_member macro to allow clean and easy struct offset checking
This patch adds a new static assertion macro that can be used to check
the offsets in structures that overlay register sets at compile time. It
uses the _Static_assert() declaration from the new ISO C11 standard,
which is supported (even without -std=c11) by GCC after version 4.6.
(There is supposedly also support in clang, although I haven't tried
it... let's deal with compiler issues when/if they turn up.)
I've added it to all structures for our current ARM SoCs for now, and I
think every new register overlay we add going forward should use them
(at least for the last member, but feel free to add more if you think
it's useful).
Change-Id: If32510e7049739ad05618d363a854dc372d64386
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/179412
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
(cherry picked from commit cef5fa13c31375a316ca4556c0039b17c8ea7900)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6905
Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/include/stddef.h')
| -rw-r--r-- | src/include/stddef.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/stddef.h b/src/include/stddef.h index d0dad6209c..137de04405 100644 --- a/src/include/stddef.h +++ b/src/include/stddef.h @@ -28,6 +28,10 @@ typedef unsigned int wint_t; #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) +#define check_member(structure, member, offset) _Static_assert( \ + offsetof(struct structure, member) == offset, \ + "`struct " #structure "` offset for `" #member "` is not " #offset ) + #ifdef __PRE_RAM__ #define ROMSTAGE_CONST const #else |