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/**
* \file wasmtime/global.h
*
* Wasmtime APIs for interacting with WebAssembly globals.
*/
#ifndef WASMTIME_GLOBAL_H
#define WASMTIME_GLOBAL_H
#include <wasm.h>
#include <wasmtime/extern.h>
#include <wasmtime/store.h>
#include <wasmtime/val.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Creates a new global value.
*
* Creates a new host-defined global value within the provided `store`
*
* \param store the store in which to create the global
* \param type the wasm type of the global being created
* \param val the initial value of the global
* \param ret a return pointer for the created global.
*
* This function may return an error if the `val` argument does not match the
* specified type of the global, or if `val` comes from a different store than
* the one provided.
*
* This function does not take ownership of any of its arguments but error is
* owned by the caller.
*/
WASM_API_EXTERN wasmtime_error_t *
wasmtime_global_new(wasmtime_context_t *store, const wasm_globaltype_t *type,
const wasmtime_val_t *val, wasmtime_global_t *ret);
/**
* \brief Returns the wasm type of the specified global.
*
* The returned #wasm_globaltype_t is owned by the caller.
*/
WASM_API_EXTERN wasm_globaltype_t *
wasmtime_global_type(const wasmtime_context_t *store,
const wasmtime_global_t *global);
/**
* \brief Get the value of the specified global.
*
* \param store the store that owns `global`
* \param global the global to get
* \param out where to store the value in this global.
*
* This function returns ownership of the contents of `out`, so
* #wasmtime_val_unroot may need to be called on the value.
*/
WASM_API_EXTERN void wasmtime_global_get(wasmtime_context_t *store,
const wasmtime_global_t *global,
wasmtime_val_t *out);
/**
* \brief Sets a global to a new value.
*
* \param store the store that owns `global`
* \param global the global to set
* \param val the value to store in the global
*
* This function may return an error if `global` is not mutable or if `val` has
* the wrong type for `global`.
*
* THis does not take ownership of any argument but returns ownership of the
* error.
*/
WASM_API_EXTERN wasmtime_error_t *
wasmtime_global_set(wasmtime_context_t *store, const wasmtime_global_t *global,
const wasmtime_val_t *val);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WASMTIME_GLOBAL_H
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