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Tweak C API for fuel

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* Ensure `store` is in the function names
* Don't abort the process on `add_fuel` when fuel isn't configured
* Allow learning about failure in both `add_fuel` and `fuel_consumed`
This commit is contained in:
Alex Crichton
2021-02-09 07:16:59 -08:00
parent 5b55ba8053
commit de27fbe20f
5 changed files with 37 additions and 17 deletions
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14
crates/c-api/include/wasmtime.h
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@@ -655,17 +655,23 @@ WASM_API_EXTERN own wasmtime_interrupt_handle_t *wasmtime_interrupt_handle_new(w
*
* Note that at this time when fuel is entirely consumed it will cause
* wasm to trap. More usages of fuel are planned for the future.
*
* If fuel is not enabled within this store then an error is returned. If fuel
* is successfully added then NULL is returned.
*/
WASM_API_EXTERN void wasmtime_add_fuel(wasm_store_t *store, uint64_t fuel);
WASM_API_EXTERN own wasmtime_error_t *wasmtime_store_add_fuel(wasm_store_t *store, uint64_t fuel);
/**
* \brief Returns the amount of fuel consumed by this store's execution so far.
*
* If fuel consumption is not enabled via #wasmtime_config_consume_fuel_set
* then this function will return 0. Also note that fuel, if enabled, must be
* originally configured via #wasmtime_add_fuel.
* then this function will return false. Otherwise true is returned and the
* fuel parameter is filled in with fuel consuemd so far.
*
* Also note that fuel, if enabled, must be originally configured via
* #wasmtime_store_add_fuel.
*/
WASM_API_EXTERN uint64_t wasmtime_fuel_consumed(wasm_store_t *store);
WASM_API_EXTERN bool wasmtime_store_fuel_consumed(wasm_store_t *store, uint64_t *fuel);
/**
* \brief Requests that WebAssembly code running in the store attached to this