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0000000000000000000000000000000000000000..e134bcee460356d97409e9d99a339718b78f8c70 GIT binary patch literal 131 zcmWlPK?=e!6hvo!Yb|XAv92nDr*NN>q>)A}qz2MRan-9EXY+Wxfn8<-ppv27^0*Cv z^gOI~natV8LevW31Q*uBd Returns number of bytes written + (import "wasi_unstable" "fd_write" (func $fd_write (param i32 i32 i32 i32) (result i32))) + + (memory 1) + (export "memory" (memory 0)) + + ;; Write 'hello world\n' to memory at an offset of 8 bytes + ;; Note the trailing newline which is required for the text to appear + (data (i32.const 8) "hello world\n") + + (func $main (export "_start") + ;; Creating a new io vector within linear memory + (i32.store (i32.const 0) (i32.const 8)) ;; iov.iov_base - This is a pointer to the start of the 'hello world\n' string + (i32.store (i32.const 4) (i32.const 12)) ;; iov.iov_len - The length of the 'hello world\n' string + + (call $fd_write + (i32.const 1) ;; file_descriptor - 1 for stdout + (i32.const 0) ;; *iovs - The pointer to the iov array, which is stored at memory location 0 + (i32.const 1) ;; iovs_len - We're printing 1 string stored in an iov - so one. + (i32.const 20) ;; nwritten - A place in memory to store the number of bytes written + ) + drop ;; Discard the number of bytes written from the top of the stack + ) +) diff --git a/__wasm/wasmtime/src/main.rs b/__wasm/wasmtime/src/main.rs new file mode 100644 index 0000000..10fb87a --- /dev/null +++ b/__wasm/wasmtime/src/main.rs @@ -0,0 +1,38 @@ +use anyhow::Result; +use wasmtime::*; + +fn main() -> Result<()> { + // Modules can be compiled through either the text or binary format + let engine = Engine::default(); + let wat = r#" + (module + (import "host" "hello" (func $host_hello (param i32))) + + (func (export "hello") + i32.const 3 + call $host_hello) + ) + "#; + let module = Module::new(&engine, wat)?; + + // Create a `Linker` which will be later used to instantiate this module. + // Host functionality is defined by name within the `Linker`. + let mut linker = Linker::new(&engine); + linker.func_wrap("host", "hello", |caller: Caller<'_, u32>, param: i32| { + println!("Got {} from WebAssembly", param); + println!("my host state is: {}", caller.data()); + })?; + + // All wasm objects operate within the context of a "store". Each + // `Store` has a type parameter to store host-specific data, which in + // this case we're using `4` for. + let mut store = Store::new(&engine, 4); + let instance = linker.instantiate(&mut store, &module)?; + let hello = instance.get_typed_func::<(), (), _>(&mut store, "hello")?; + + // And finally we can call the wasm! + hello.call(&mut store, ())?; + + Ok(()) +} +