From 4b3a3d9d0f84df8997d466d009da9fffdfbdcbe1 Mon Sep 17 00:00:00 2001
From: Casper Beyer <caspervonb@pm.me>
Date: Sat, 15 Aug 2020 01:48:37 +0800
Subject: [PATCH] Enable WebAssembly.instantiateStreaming (#7043)

---
 cli/tests/integration_tests.rs |  5 +++++
 cli/tests/wasm_streaming.js    | 29 +++++++++++++++++++++++++++++
 cli/tests/wasm_streaming.out   |  1 +
 core/core_isolate.rs           |  1 +
 4 files changed, 36 insertions(+)
 create mode 100644 cli/tests/wasm_streaming.js
 create mode 100644 cli/tests/wasm_streaming.out

diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index 6e487d12f9..76f82df231 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -2060,6 +2060,11 @@ itest!(wasm_async {
   output: "wasm_async.out",
 });
 
+itest!(wasm_streaming {
+  args: "run wasm_streaming.js",
+  output: "wasm_streaming.out",
+});
+
 itest!(wasm_unreachable {
   args: "run wasm_unreachable.js",
   output: "wasm_unreachable.out",
diff --git a/cli/tests/wasm_streaming.js b/cli/tests/wasm_streaming.js
new file mode 100644
index 0000000000..6c94573251
--- /dev/null
+++ b/cli/tests/wasm_streaming.js
@@ -0,0 +1,29 @@
+// The following blob can be created by taking the following s-expr and pass
+// it through wat2wasm.
+//    (module
+//      (func $add (param $a i32) (param $b i32) (result i32)
+//        local.get $a
+//        local.get $b
+//        i32.add)
+//      (export "add" (func $add))
+//    )
+// deno-fmt-ignore
+const bytes = new Uint8Array([
+  0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, 0x01, 0x07, 0x01, 0x60,
+  0x02, 0x7f, 0x7f, 0x01, 0x7f, 0x03, 0x02, 0x01, 0x00, 0x07, 0x07, 0x01,
+  0x03, 0x61, 0x64, 0x64, 0x00, 0x00, 0x0a, 0x09, 0x01, 0x07, 0x00, 0x20,
+  0x00, 0x20, 0x01, 0x6a, 0x0b
+]);
+
+async function main() {
+  const wasm = await WebAssembly.instantiateStreaming(bytes, {
+  });
+
+  const result = wasm.instance.exports.add(1, 3);
+  console.log("1 + 3 =", result);
+  if (result != 4) {
+    throw Error("bad");
+  }
+}
+
+main();
diff --git a/cli/tests/wasm_streaming.out b/cli/tests/wasm_streaming.out
new file mode 100644
index 0000000000..5cdf17de73
--- /dev/null
+++ b/cli/tests/wasm_streaming.out
@@ -0,0 +1 @@
+1 + 3 = 4
diff --git a/core/core_isolate.rs b/core/core_isolate.rs
index 199bbd832a..dc523c9828 100644
--- a/core/core_isolate.rs
+++ b/core/core_isolate.rs
@@ -175,6 +175,7 @@ pub unsafe fn v8_init() {
   // See https://github.com/denoland/deno/issues/2544
   let argv = vec![
     "".to_string(),
+    "--wasm-test-streaming".to_string(),
     "--no-wasm-async-compilation".to_string(),
     "--harmony-top-level-await".to_string(),
     "--experimental-wasm-bigint".to_string(),