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charset="utf-8" Because conversion to stackless coroutines is incredibly repetitive, define some magic variable-argument macros that simplify the task: - CO_DECLARE_FRAME() declares a frame structure, with a couple common fields and the extras coming from variable arguments - CO_INIT_FRAME() allocates the frame structure, builds it using any argume= nts provided by the user, and continues with the second part of the awaitable function that takes the frame as its only argument - CO_ARG() declare variables and load them from the frame structure. It uses typeof() to avoid repetition of the type of the variable (it is need= ed only twice, in CO_DECLARE_FRAME() and in the declaration of the user-visi= ble awaitable function) - CO_DECLARE() also declares variables using typeof, but it's for locals th= at are not prepared by CO_INIT_FRAME() - CO_SAVE() and CO_LOAD() copy to and from the frame structure Signed-off-by: Paolo Bonzini --- include/qemu/coroutine.h | 41 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/include/qemu/coroutine.h b/include/qemu/coroutine.h index 2f2be6abfe..df148ff80e 100644 --- a/include/qemu/coroutine.h +++ b/include/qemu/coroutine.h @@ -361,4 +361,45 @@ void qemu_coroutine_decrease_pool_batch_size(unsigned = int additional_pool_size); void *coroutine_only_fn stack_alloc(CoroutineImpl *func, size_t bytes); CoroutineAction coroutine_only_fn stack_free(CoroutineFrame *f); =20 + +#define CO_DO(MACRO, ...) CO_DO_(MACRO, __VA_ARGS__, 10, 9, 8, 7, 6, 5, 4,= 3, 2, 1, 0) +#define CO_DO_(MACRO, a0, a1, a2, a3, a4, a5, a6, a7, a8 , a9, n, ...) CO_= DO##n(MACRO, a0, a1, a2, a3, a4, a5, a6, a7, a8 , a9) +#define CO_DO0(MACRO, a0, ...) +#define CO_DO1(MACRO, a0, ...) MACRO(a0) +#define CO_DO2(MACRO, a0, ...) MACRO(a0); CO_DO1(MACRO, __VA_ARGS__) +#define CO_DO3(MACRO, a0, ...) MACRO(a0); CO_DO2(MACRO, __VA_ARGS__) +#define CO_DO4(MACRO, a0, ...) MACRO(a0); CO_DO3(MACRO, __VA_ARGS__) +#define CO_DO5(MACRO, a0, ...) MACRO(a0); CO_DO4(MACRO, __VA_ARGS__) +#define CO_DO6(MACRO, a0, ...) MACRO(a0); CO_DO5(MACRO, __VA_ARGS__) +#define CO_DO7(MACRO, a0, ...) MACRO(a0); CO_DO6(MACRO, __VA_ARGS__) +#define CO_DO8(MACRO, a0, ...) MACRO(a0); CO_DO7(MACRO, __VA_ARGS__) +#define CO_DO9(MACRO, a0, ...) MACRO(a0); CO_DO8(MACRO, __VA_ARGS__) + +#define CO_FRAME1(decl) decl +#define CO_SAVE1(var) _f->var =3D var +#define CO_LOAD1(var) var =3D _f->var +#define CO_DECLARE1(var) typeof(_f->var) var +#define CO_ARG1(var) typeof(_f->var) var =3D _f->var + +#define CO_SAVE(...) CO_DO(CO_SAVE1, __VA_ARGS__) +#define CO_LOAD(...) CO_DO(CO_LOAD1, __VA_ARGS__) +#define CO_DECLARE(...) CO_DO(CO_DECLARE1, __VA_ARGS__) +#define CO_ARG(...) CO_DO(CO_ARG1, __VA_ARGS__) + +#define CO_DECLARE_FRAME(func, ...) \ + struct FRAME__##func { \ + CoroutineFrame common; \ + uint32_t _step; \ + CO_DO(CO_FRAME1, __VA_ARGS__); \ + } + +#define CO_INIT_FRAME(func, ...) \ + co__##func(({ \ + struct FRAME__##func *_f; \ + _f =3D stack_alloc(co__##func, sizeof(*_f)); \ + __VA_OPT__(CO_SAVE(__VA_ARGS__);) \ + _f->_step =3D 0; \ + _f; \ + })) + #endif /* QEMU_COROUTINE_H */ --=20 2.35.1