Struct node_testing::client::sc_executor::sp_wasm_interface::wasmtime::Caller
pub struct Caller<'a, T> { /* private fields */ }
Expand description
A structure representing the caller’s context when creating a function
via Func::wrap
.
This structure can be taken as the first parameter of a closure passed to
Func::wrap
or other constructors, and serves two purposes:
-
First consumers can use
Caller<'_, T>
to get access toStoreContextMut<'_, T>
and/or get access toT
itself. This means that theCaller
type can serve as a proxy to the originalStore
itself and is used to satisfyAsContext
andAsContextMut
bounds. -
Second a
Caller
can be used as the name implies, learning about the caller’s context, namely it’s exported memory and exported functions. This allows functions which take pointers as arguments to easily read the memory the pointers point into, or if a function is expected to call malloc in the wasm module to reserve space for the output you can do that.
Host functions which want access to Store
-level state are
recommended to use this type.
Implementations§
§impl<T> Caller<'_, T>
impl<T> Caller<'_, T>
pub fn get_export(&mut self, name: &str) -> Option<Extern>
pub fn get_export(&mut self, name: &str) -> Option<Extern>
Looks up an export from the caller’s module by the name
given.
This is a low-level function that’s typically used to implement passing of pointers or indices between core Wasm instances, where the callee needs to consult the caller’s exports to perform memory management and resolve the references.
For comparison, in components, the component model handles translating arguments from one component instance to another and managing memory, so that callees don’t need to be aware of their callers, which promotes virtualizability of APIs.
§Return
If an export with the name
provided was found, then it is returned as an
Extern
. There are a number of situations, however, where the export may not
be available:
- The caller instance may not have an export named
name
- There may not be a caller available, for example if
Func
was called directly from host code.
It’s recommended to take care when calling this API and gracefully
handling a None
return value.
pub fn data(&self) -> &T
pub fn data(&self) -> &T
Access the underlying data owned by this Store
.
Same as Store::data
pub fn data_mut(&mut self) -> &mut T
pub fn data_mut(&mut self) -> &mut T
Access the underlying data owned by this Store
.
Same as Store::data_mut
pub fn fuel_consumed(&self) -> Option<u64>
pub fn fuel_consumed(&self) -> Option<u64>
Returns the fuel consumed by this store.
For more information see Store::fuel_consumed
pub fn add_fuel(&mut self, fuel: u64) -> Result<(), Error>
pub fn add_fuel(&mut self, fuel: u64) -> Result<(), Error>
Inject more fuel into this store to be consumed when executing wasm code.
For more information see Store::add_fuel
pub fn consume_fuel(&mut self, fuel: u64) -> Result<u64, Error>
pub fn consume_fuel(&mut self, fuel: u64) -> Result<u64, Error>
Synthetically consumes fuel from the store.
For more information see Store::consume_fuel
pub fn out_of_fuel_trap(&mut self)
pub fn out_of_fuel_trap(&mut self)
Configures this Store
to trap whenever fuel runs out.
For more information see
Store::out_of_fuel_trap
pub fn out_of_fuel_async_yield(
&mut self,
injection_count: u64,
fuel_to_inject: u64,
)
pub fn out_of_fuel_async_yield( &mut self, injection_count: u64, fuel_to_inject: u64, )
Configures this Store
to yield while executing futures whenever fuel
runs out.
For more information see
Store::out_of_fuel_async_yield
Trait Implementations§
§impl<T> AsContext for Caller<'_, T>
impl<T> AsContext for Caller<'_, T>
§fn as_context(&self) -> StoreContext<'_, T>
fn as_context(&self) -> StoreContext<'_, T>
§impl<T> AsContextMut for Caller<'_, T>
impl<T> AsContextMut for Caller<'_, T>
§fn as_context_mut(&mut self) -> StoreContextMut<'_, T>
fn as_context_mut(&mut self) -> StoreContextMut<'_, T>
Auto Trait Implementations§
impl<'a, T> Freeze for Caller<'a, T>
impl<'a, T> !RefUnwindSafe for Caller<'a, T>
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T: Send,
impl<'a, T> Sync for Caller<'a, T>where
T: Sync,
impl<'a, T> Unpin for Caller<'a, T>
impl<'a, T> !UnwindSafe for Caller<'a, T>
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