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| author | Thomas Huth <thuth@redhat.com> | 2020-12-11 16:24:24 +0100 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2020-12-18 09:14:23 +0100 |
| commit | d84568b773fe1fc469c4d8419c3545be52eec82c (patch) | |
| tree | 852e4d7439e40e2609041c5fb00746225c549db2 /include/qemu/compiler.h | |
| parent | 9cf5a9cf60a3c5271dee05b6a81a05fb45bee622 (diff) | |
| download | qemu-d84568b773fe1fc469c4d8419c3545be52eec82c.zip qemu-d84568b773fe1fc469c4d8419c3545be52eec82c.tar.gz qemu-d84568b773fe1fc469c4d8419c3545be52eec82c.tar.bz2 | |
tcg/optimize: Add fallthrough annotations
To be able to compile this file with -Werror=implicit-fallthrough,
we need to add some fallthrough annotations to the case statements
that might fall through. Unfortunately, the typical "/* fallthrough */"
comments do not work here as expected since some case labels are
wrapped in macros and the compiler fails to match the comments in
this case. But using __attribute__((fallthrough)) seems to work fine,
so let's use that instead (by introducing a new QEMU_FALLTHROUGH
macro in our compiler.h header file).
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20201211152426.350966-11-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'include/qemu/compiler.h')
| -rw-r--r-- | include/qemu/compiler.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 1b9e58e..df9ec08 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -222,4 +222,15 @@ extern void QEMU_NORETURN QEMU_ERROR("code path is reachable") #define qemu_build_not_reached() g_assert_not_reached() #endif +/** + * In most cases, normal "fallthrough" comments are good enough for + * switch-case statements, but sometimes the compiler has problems + * with those. In that case you can use QEMU_FALLTHROUGH instead. + */ +#if __has_attribute(fallthrough) +# define QEMU_FALLTHROUGH __attribute__((fallthrough)) +#else +# define QEMU_FALLTHROUGH do {} while (0) /* fallthrough */ +#endif + #endif /* COMPILER_H */ |