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qemu/compiler.h: Add qemu_build_not_reached

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Use this as a compile-time assert that a particular
code path is not reachable.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-09-23 11:24:12 -07:00
parent c6b716cdc0
commit 560e36d5a4
1 changed files with 15 additions and 0 deletions
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15
include/qemu/compiler.h
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@ -221,4 +221,19 @@
#define QEMU_GENERIC9(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC8(x, __VA_ARGS__))
#define QEMU_GENERIC10(x, a0, ...) QEMU_GENERIC_IF(x, a0, QEMU_GENERIC9(x, __VA_ARGS__))
/**
* qemu_build_not_reached()
*
* The compiler, during optimization, is expected to prove that a call
* to this function cannot be reached and remove it. If the compiler
* supports QEMU_ERROR, this will be reported at compile time; otherwise
* this will be reported at link time due to the missing symbol.
*/
#ifdef __OPTIMIZE__
extern void QEMU_NORETURN QEMU_ERROR("code path is reachable")
qemu_build_not_reached(void);
#else
#define qemu_build_not_reached() g_assert_not_reached()
#endif
#endif /* COMPILER_H */