Struct wasmtime_runtime::VMHostFuncContext

#[repr(C)]
pub struct VMHostFuncContext { /* private fields */ }

The VM*Context for host functions.

Its magic field must always be wasmtime_environ::VM_HOST_FUNC_MAGIC, and this is how you can determine whether a VM*Context is a VMHostFuncContext versus a different kind of context.

Implementations

impl VMHostFuncContext

pub unsafe fn new(
    host_func: NonNull<VMFunctionBody>,
    signature: VMSharedSignatureIndex,
    host_state: Box<dyn Any + Send + Sync>
) -> Box<VMHostFuncContext>

Create the context for the given host function.

Safety

The host_func must be a pointer to a host (not Wasm) function and it must be Send and Sync.

pub fn wasm_to_host_trampoline(&self) -> NonNull<VMCallerCheckedAnyfunc>

Get the Wasm-to-host trampoline for this host function context.

pub fn host_state(&self) -> &(dyn Any + Send + Sync)

Get the host state for this host function context.

impl VMHostFuncContext

pub unsafe fn from_opaque(
    opaque: *mut VMOpaqueContext
) -> *mut VMHostFuncContext

Helper function to cast between context types using a debug assertion to protect against some mistakes.

Trait Implementations

impl Send for VMHostFuncContext

impl Sync for VMHostFuncContext