Merge pull request #285 from wasmerio/public-instance

Return the raw instance when instantiating. Fix #284

README.md

@@ -77,7 +77,7 @@ export class WASI {
   constructor(config: any);
   readonly fs: MemFS;
 
-  instantiate(module: any, imports: object): void;
+  instantiate(module: any, imports: object): WebAssembly.Instance;
   // Start the WASI Instance, it returns the status code when calling the start
   // function
   start(): number;

pkg/wasmer_wasi_js.d.ts

@@ -103,8 +103,9 @@ export class WASI {
 /**
 * @param {any} module
 * @param {object} imports
+* @returns {WebAssembly.Instance}
 */
-  instantiate(module: any, imports: object): void;
+  instantiate(module: any, imports: object): WebAssembly.Instance;
 /**
 * Start the WASI Instance, it returns the status code when calling the start
 * function
@@ -186,7 +187,7 @@ export interface InitOutput {
   readonly __wbg_wasi_free: (a: number) => void;
   readonly wasi_new: (a: number) => number;
   readonly wasi_fs: (a: number) => number;
-  readonly wasi_instantiate: (a: number, b: number, c: number) => void;
+  readonly wasi_instantiate: (a: number, b: number, c: number) => number;
   readonly wasi_start: (a: number) => number;
   readonly wasi_getStdoutBuffer: (a: number, b: number) => void;
   readonly wasi_getStdoutString: (a: number, b: number) => void;

pkg/wasmer_wasi_js.js

@@ -511,9 +511,11 @@ export class WASI {
     /**
     * @param {any} module
     * @param {object} imports
+    * @returns {WebAssembly.Instance}
     */
     instantiate(module, imports) {
-        wasm.wasi_instantiate(this.ptr, addHeapObject(module), addHeapObject(imports));
+        var ret = wasm.wasi_instantiate(this.ptr, addHeapObject(module), addHeapObject(imports));
+        return takeObject(ret);
     }
     /**
     * Start the WASI Instance, it returns the status code when calling the start

pkg/wasmer_wasi_js_bg.wasm.d.ts

@@ -25,7 +25,7 @@ export function jsvirtualfile_seek(a: number, b: number): number;
 export function __wbg_wasi_free(a: number): void;
 export function wasi_new(a: number): number;
 export function wasi_fs(a: number): number;
-export function wasi_instantiate(a: number, b: number, c: number): void;
+export function wasi_instantiate(a: number, b: number, c: number): number;
 export function wasi_start(a: number): number;
 export function wasi_getStdoutBuffer(a: number, b: number): void;
 export function wasi_getStdoutString(a: number, b: number): void;

src/wasi.rs

@@ -121,7 +121,7 @@ impl WASI {
         Ok(mem_fs.clone())
     }
 
-    pub fn instantiate(&mut self, module: JsValue, imports: js_sys::Object) -> Result<(), JsValue> {
+    pub fn instantiate(&mut self, module: JsValue, imports: js_sys::Object) -> Result<js_sys::WebAssembly::Instance, JsValue> {
         let module: js_sys::WebAssembly::Module = module.dyn_into().map_err(|_e| {
             js_sys::Error::new(
                 "You must provide a module to the WASI new. `let module = new WASI({}, module);`",
@@ -137,8 +137,11 @@ impl WASI {
 
         let instance = Instance::new(&module, &resolver)
             .map_err(|e| js_sys::Error::new(&format!("Failed to instantiate WASI: {}`", e)))?;
+
+        let raw_instance = instance.raw().clone();
         self.instantiated = Some(InstantiatedWASI { resolver, instance });
-        Ok(())
+
+        Ok(raw_instance)
     }
 
     /// Start the WASI Instance, it returns the status code when calling the start