fx/fx.reflection/sys/apple/aarch64/include/platform/callvm.h

#ifndef FX_REFLECTION_DARWIN_ARM64_CALLVM_H_
#define FX_REFLECTION_DARWIN_ARM64_CALLVM_H_

#include <fx/reflection/function.h>
#include <fx/value.h>
#include <stdint.h>

#define CALLVM_INVOKE_PROTOTYPE(suffix)                                        \
	fx_value callvm_invoke_##suffix(                                       \
		struct callvm *vm,                                             \
		fx_function_impl impl)

#define MAX_FIXED_ARGS  ((unsigned int)-1)
#define MAX_DOUBLE_ARGS 8
#define MAX_INT_ARGS    8

/* dyn-dispatch.S depends on the layout of this struct */
struct callvm {
	uint64_t vm_arg_int_count;
	uint64_t vm_arg_double_count;

	/* any args pushed after this limit is reached will be stored in the
	 * excess buffer. used for calling varargs functions */
	uint64_t vm_arg_count, vm_arg_fixed;

	uint64_t vm_arg_excess_count;
	uint64_t vm_arg_excess_max;

	uintptr_t vm_arg_int[MAX_INT_ARGS];
	double vm_arg_double[MAX_DOUBLE_ARGS];
	uintptr_t *vm_arg_excess;
};

typedef fx_value (*callvm_invoke_impl)(struct callvm *, fx_function_impl);

extern void callvm_reset(struct callvm *vm, unsigned int max_fixed_args);
extern void callvm_push(struct callvm *vm, const fx_value *value);
extern fx_value callvm_invoke(
	struct callvm *vm,
	fx_function_impl impl,
	fx_type_id return_type);

#endif