Helpers for dealing with assemblyscript memory inside wasmer-runtime
#[macro_use]
extern crate wasmer_runtime;
extern crate wasmer_as;
use std::error::Error;
use wasmer_as::{AsmScriptString, AsmScriptStringPtr};
use wasmer_runtime::{imports, instantiate, Ctx, Func};
fn main() -> Result<(), Box<dyn Error>> {
let wasm = include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/get-string.wasm"));
let import_object = imports! {
"env" => {
"abort" => func!(abort),
},
};
let instance = instantiate(&wasm[..], &import_object)?;
// for the test we use simple function returning constant string:
//
// export function getString(): string {
// return "TheString";
// }
let get_string: Func<(), AsmScriptStringPtr> = instance.func("getString")?;
let str_ptr = get_string.call()?;
let string = str_ptr.get_as_string(instance.context().memory(0))?;
assert_eq!(string, "TheString");
Ok(())
}
// if get_string throws an exception abort for some reason is being called
fn abort(ctx: &mut Ctx, message: AsmScriptStringPtr, filename: AsmScriptStringPtr, line: i32, col: i32) {
let memory = ctx.memory(0);
let message = message.get_as_string(memory).unwrap();
let filename = filename.get_as_string(memory).unwrap();
eprintln!("Error: {} at {}:{} col: {}", message, filename, line, col);
}