Struct wasmtime_runtime::SignatureRegistry

pub struct SignatureRegistry { /* fields omitted */ }

WebAssembly requires that the caller and callee signatures in an indirect call must match. To implement this efficiently, keep a registry of all signatures, shared by all instances, so that call sites can just do an index comparison.

Implementations

impl SignatureRegistry

pub fn register(
    &mut self,
    wasm: WasmFuncType,
    native: Signature
) -> VMSharedSignatureIndex

Register a signature and return its unique index.

pub fn lookup_native(&self, idx: VMSharedSignatureIndex) -> Option<Signature>

Looks up a shared native signature within this registry.

Note that for this operation to be semantically correct the idx must have previously come from a call to register of this same object.

pub fn lookup_wasm(&self, idx: VMSharedSignatureIndex) -> Option<WasmFuncType>

Looks up a shared Wasm signature within this registry.

Note that for this operation to be semantically correct the idx must have previously come from a call to register of this same object.

pub fn lookup_wasm_and_native_signatures(
    &self,
    idx: VMSharedSignatureIndex
) -> Option<(WasmFuncType, Signature)>

Looks up both a shared Wasm function signature and its associated native ir::Signature within this registry.

Note that for this operation to be semantically correct the idx must have previously come from a call to register of this same object.

Trait Implementations

impl Debug for SignatureRegistry

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SignatureRegistry

fn default() -> SignatureRegistry

Returns the “default value” for a type.