wasmer/lib/runtime/examples/simple/main.rs
2019-01-21 15:21:51 -08:00

49 lines
1.4 KiB
Rust

use wabt::wat2wasm;
use wasmer_clif_backend::CraneliftCompiler;
use wasmer_runtime::{self as runtime, error::Result, prelude::*};
static EXAMPLE_WASM: &'static [u8] = include_bytes!("simple.wasm");
fn main() -> Result<()> {
let wasm_binary = wat2wasm(IMPORT_MODULE.as_bytes()).expect("WAST not valid or malformed");
let inner_module = runtime::compile(&wasm_binary, &CraneliftCompiler::new())?;
let mut env_namespace = Namespace::new();
env_namespace.insert(
"print_i32",
export_func!(
print_num,
[i32] -> [i32]
),
);
let mut imports = ImportObject::new();
imports.register("env", env_namespace);
let inner_instance = inner_module.instantiate(imports)?;
let mut outer_imports = ImportObject::new();
outer_imports.register("env", inner_instance);
let outer_module = runtime::compile(EXAMPLE_WASM, &CraneliftCompiler::new())?;
let mut outer_instance = outer_module.instantiate(outer_imports)?;
let ret = outer_instance.call("main", &[Value::I32(42)])?;
println!("ret: {:?}", ret);
Ok(())
}
extern "C" fn print_num(n: i32, _vmctx: &mut vm::Ctx) -> i32 {
println!("print_num({})", n);
n + 1
}
static IMPORT_MODULE: &str = r#"
(module
(type $t0 (func (param i32) (result i32)))
(import "env" "print_i32" (func $print_i32 (type $t0)))
(func $print_num (export "print_num") (type $t0) (param $p0 i32) (result i32)
get_local $p0
call $print_i32))
"#;