From 6fe7b434160c84cbac1157073a795ac6e9f30479 Mon Sep 17 00:00:00 2001
From: Richard Musiol <mail@richard-musiol.de>
Date: Thu, 5 Jul 2018 15:32:31 +0200
Subject: [PATCH] misc/wasm: free up memory on exit

Private fields of the Go class are not used any more after the program
has exited. Delete them to allow JavaScript's garbage collection to
clean up the WebAssembly instance.

Updates #26193.

Change-Id: I349784a49eaad0c22ceedd4f859df97132775537
Reviewed-on: https://go-review.googlesource.com/122296
Run-TryBot: Richard Musiol <neelance@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Paul Jolly <paul@myitcv.org.uk>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---
 misc/wasm/wasm_exec.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/misc/wasm/wasm_exec.js b/misc/wasm/wasm_exec.js
index 565dc928bc..233c5aa187 100644
--- a/misc/wasm/wasm_exec.js
+++ b/misc/wasm/wasm_exec.js
@@ -177,8 +177,12 @@
 				go: {
 					// func wasmExit(code int32)
 					"runtime.wasmExit": (sp) => {
+						const code = mem().getInt32(sp + 8, true);
 						this.exited = true;
-						this.exit(mem().getInt32(sp + 8, true));
+						delete this._inst;
+						delete this._values;
+						delete this._refs;
+						this.exit(code);
 					},
 
 					// func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)
-- 
2.50.0