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/**
* \file wasmtime/extern.h
*
* \brief Definition of #wasmtime_extern_t and external items.
*/
#ifndef WASMTIME_EXTERN_H
#define WASMTIME_EXTERN_H
#include <wasmtime/module.h>
#include <wasmtime/sharedmemory.h>
#include <wasmtime/store.h>
#ifdef __cplusplus
extern "C" {
#endif
/// \brief Representation of a function in Wasmtime.
///
/// Functions in Wasmtime are represented as an index into a store and don't
/// have any data or destructor associated with the #wasmtime_func_t value.
/// Functions cannot interoperate between #wasmtime_store_t instances and if the
/// wrong function is passed to the wrong store then it may trigger an assertion
/// to abort the process.
typedef struct wasmtime_func {
/// Internal identifier of what store this belongs to.
///
/// This field may be zero when used in conjunction with #wasmtime_val_t
/// to represent a null `funcref` value in WebAssembly. For a valid function
/// this field is otherwise never zero.
uint64_t store_id;
/// Private field for Wasmtime, undefined if `store_id` is zero.
size_t __private;
} wasmtime_func_t;
/// \brief Representation of a table in Wasmtime.
///
/// Tables in Wasmtime are represented as an index into a store and don't
/// have any data or destructor associated with the #wasmtime_table_t value.
/// Tables cannot interoperate between #wasmtime_store_t instances and if the
/// wrong table is passed to the wrong store then it may trigger an assertion
/// to abort the process.
typedef struct wasmtime_table {
/// Internal identifier of what store this belongs to, never zero.
uint64_t store_id;
/// Private field for Wasmtime.
size_t __private;
} wasmtime_table_t;
/// \brief Representation of a memory in Wasmtime.
///
/// Memories in Wasmtime are represented as an index into a store and don't
/// have any data or destructor associated with the #wasmtime_memory_t value.
/// Memories cannot interoperate between #wasmtime_store_t instances and if the
/// wrong memory is passed to the wrong store then it may trigger an assertion
/// to abort the process.
typedef struct wasmtime_memory {
/// Internal identifier of what store this belongs to, never zero.
uint64_t store_id;
/// Private field for Wasmtime.
size_t __private;
} wasmtime_memory_t;
/// \brief Representation of a global in Wasmtime.
///
/// Globals in Wasmtime are represented as an index into a store and don't
/// have any data or destructor associated with the #wasmtime_global_t value.
/// Globals cannot interoperate between #wasmtime_store_t instances and if the
/// wrong global is passed to the wrong store then it may trigger an assertion
/// to abort the process.
typedef struct wasmtime_global {
/// Internal identifier of what store this belongs to, never zero.
uint64_t store_id;
/// Private field for Wasmtime.
size_t __private;
} wasmtime_global_t;
/// \brief Discriminant of #wasmtime_extern_t
typedef uint8_t wasmtime_extern_kind_t;
/// \brief Value of #wasmtime_extern_kind_t meaning that #wasmtime_extern_t is a
/// function
#define WASMTIME_EXTERN_FUNC 0
/// \brief Value of #wasmtime_extern_kind_t meaning that #wasmtime_extern_t is a
/// global
#define WASMTIME_EXTERN_GLOBAL 1
/// \brief Value of #wasmtime_extern_kind_t meaning that #wasmtime_extern_t is a
/// table
#define WASMTIME_EXTERN_TABLE 2
/// \brief Value of #wasmtime_extern_kind_t meaning that #wasmtime_extern_t is a
/// memory
#define WASMTIME_EXTERN_MEMORY 3
/// \brief Value of #wasmtime_extern_kind_t meaning that #wasmtime_extern_t is a
/// shared memory
#define WASMTIME_EXTERN_SHAREDMEMORY 4
/**
* \typedef wasmtime_extern_union_t
* \brief Convenience alias for #wasmtime_extern_union
*
* \union wasmtime_extern_union
* \brief Container for different kinds of extern items.
*
* This type is contained in #wasmtime_extern_t and contains the payload for the
* various kinds of items an extern wasm item can be.
*/
typedef union wasmtime_extern_union {
/// Field used if #wasmtime_extern_t::kind is #WASMTIME_EXTERN_FUNC
wasmtime_func_t func;
/// Field used if #wasmtime_extern_t::kind is #WASMTIME_EXTERN_GLOBAL
wasmtime_global_t global;
/// Field used if #wasmtime_extern_t::kind is #WASMTIME_EXTERN_TABLE
wasmtime_table_t table;
/// Field used if #wasmtime_extern_t::kind is #WASMTIME_EXTERN_MEMORY
wasmtime_memory_t memory;
/// Field used if #wasmtime_extern_t::kind is #WASMTIME_EXTERN_SHAREDMEMORY
struct wasmtime_sharedmemory *sharedmemory;
} wasmtime_extern_union_t;
/**
* \typedef wasmtime_extern_t
* \brief Convenience alias for #wasmtime_extern_t
*
* \union wasmtime_extern
* \brief Container for different kinds of extern items.
*
* Note that this structure may contain an owned value, namely
* #wasmtime_module_t, depending on the context in which this is used. APIs
* which consume a #wasmtime_extern_t do not take ownership, but APIs that
* return #wasmtime_extern_t require that #wasmtime_extern_delete is called to
* deallocate the value.
*/
typedef struct wasmtime_extern {
/// Discriminant of which field of #of is valid.
wasmtime_extern_kind_t kind;
/// Container for the extern item's value.
wasmtime_extern_union_t of;
} wasmtime_extern_t;
/// \brief Deletes a #wasmtime_extern_t.
void wasmtime_extern_delete(wasmtime_extern_t *val);
/// \brief Returns the type of the #wasmtime_extern_t defined within the given
/// store.
///
/// Does not take ownership of `context` or `val`, but the returned
/// #wasm_externtype_t is an owned value that needs to be deleted.
wasm_externtype_t *wasmtime_extern_type(wasmtime_context_t *context,
wasmtime_extern_t *val);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WASMTIME_EXTERN_H
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