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do backend caching with a directory

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This commit is contained in:
Mark McCaskey
2019-07-08 17:05:54 -07:00
parent 4407a7cf93
commit 30add2481e
6 changed files with 32 additions and 27 deletions
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20
lib/runtime-core/src/cache.rs
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@ -37,31 +37,17 @@ impl From<io::Error> for Error {
pub struct WasmHash([u8; 32], [u8; 32]);
impl WasmHash {
/// Hash a wasm module for the default compiler backend.
///
/// See also: `WasmHash::generate_for_backend`.
/// Hash a wasm module.
///
/// # Note:
/// This does no verification that the supplied data
/// is, in fact, a wasm module.
pub fn generate(wasm: &[u8]) -> Self {
WasmHash::generate_for_backend(wasm, Backend::default())
}
/// Hash a wasm module for a specific compiler backend.
/// This allows multiple cache entries containing the same compiled
/// module with different compiler backends.
///
/// # Note:
/// This function also does no verification that the supplied data
/// is a wasm module
pub fn generate_for_backend(wasm: &[u8], backend: Backend) -> Self {
let mut first_part = [0u8; 32];
let mut second_part = [0u8; 32];
let mut state = blake2bp::State::new();
state.update(wasm);
state.update(backend.to_string().as_bytes());
let hasher = state.finalize();
let generic_array = hasher.as_bytes();
@ -243,7 +229,11 @@ pub trait Cache {
type LoadError: fmt::Debug;
type StoreError: fmt::Debug;
/// loads a module using the default `Backend`
fn load(&self, key: WasmHash) -> Result<Module, Self::LoadError>;
/// loads a cached module using a specific `Backend`
fn load_with_backend(&self, key: WasmHash, backend: Backend)
-> Result<Module, Self::LoadError>;
fn store(&mut self, key: WasmHash, module: Module) -> Result<(), Self::StoreError>;
}