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diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md index 9665745..28607da 100644 --- a/ARCHITECTURE.md +++ b/ARCHITECTURE.md @@ -12,6 +12,7 @@ Some key differences are: - TinyWasm is architectured to allow for a JIT compiler to be added later. Functions are stored as FunctionInstances which can contain either a `WasmFunction` or a `HostFunction`. A third variant `JitFunction` could be added later to store a pointer to the compiled function. This would allow for the JIT to be used transparently without changing the rest of the runtime. - TinyWasm is designed to be used in `no_std` environments. The `std` feature is enabled by default, but can be disabled to remove the dependency on `std` and `std::io`. This is done by disabling the `std` and `parser` features. The `logging` feature can also be disabled to remove the dependency on `log`. This is not recommended, since `libm` is not as performant as the compiler's math intrinsics, especially on wasm32 targets, but can be useful for resource-constrained devices or other environments where `std` is not available such as OS kernels. - Call Frames are executed in a loop instead of recursively. This allows the use of a single stack for all frames and makes it easier to pause execution and resume it later, or to step through the code one instruction at a time. +- While other interpreters convert `locals` to be register-based when parsing the function body, TinyWasm keeps them in a stack. This is mostly for simplicity in the implementation, but performance is still comparable or better than other interpreters. ## Bytecode Format |