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kernel: add basic C++ support for GINT_CALL()

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Lephe 2021-06-22 17:51:27 +02:00
parent 8d444b4f78
commit 89d540ee91
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1 changed files with 22 additions and 5 deletions
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27
include/gint/defs/call.h
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@ -115,19 +115,31 @@ typedef struct {
* error: cast to union type from type not present in union
-> This is emitted if you pass a parameter of an invalid type. */
#define GINT_CALL(func, ...) \
((gint_call_t){ .function = func, .args = { \
((gint_call_t){ .function = (void *)func, .args = { \
__VA_OPT__(GINT_CALL_ARGS1(__VA_ARGS__)) \
}})
#define GINT_CALL_ARGS1(a1, ...) \
(gint_call_arg_t)(a1), __VA_OPT__(GINT_CALL_ARGS2(__VA_ARGS__))
GINT_CALL_ARG(a1), __VA_OPT__(GINT_CALL_ARGS2(__VA_ARGS__))
#define GINT_CALL_ARGS2(a2, ...) \
(gint_call_arg_t)(a2), __VA_OPT__(GINT_CALL_ARGS3(__VA_ARGS__))
GINT_CALL_ARG(a2), __VA_OPT__(GINT_CALL_ARGS3(__VA_ARGS__))
#define GINT_CALL_ARGS3(a3, ...) \
(gint_call_arg_t)(a3), __VA_OPT__(GINT_CALL_ARGS4(__VA_ARGS__))
GINT_CALL_ARG(a3), __VA_OPT__(GINT_CALL_ARGS4(__VA_ARGS__))
#define GINT_CALL_ARGS4(a4, ...) \
({ __VA_OPT__(_Static_assert(0, \
"GINT_CALL: too many arguments (maximum 4)");) \
(gint_call_arg_t)(a4); })
GINT_CALL_ARG(a4); })
#ifdef __cplusplus
/* Kind of ugly but I don't have super cool templated logic right now.
TODO: Allow any 4-byte type using C++ magic. */
#define GINT_CALL_ARG(expr) ({ \
auto __arg = (expr); \
(*reinterpret_cast<gint_call_arg_t *>(&__arg)); \
})
#else
/* GCC extension: Cast to union */
#define GINT_CALL_ARG(expr) (gint_call_arg_t)(expr)
#endif
/* GINT_CALL_NULL: Empty function call */
#define GINT_CALL_NULL ((gint_call_t){ .function = NULL, .args = {} })
@ -135,7 +147,12 @@ typedef struct {
/* gint_call(): Perform an indirect call */
static GINLINE int gint_call(gint_call_t cb)
{
#ifdef __cplusplus
int (*f)(int r4, int r5, int r6, int r7) = (decltype(f))cb.function;
#else
int (*f)(int r4, int r5, int r6, int r7) = cb.function;
#endif
return f(cb.args[0].i, cb.args[1].i, cb.args[2].i, cb.args[3].i);
}