feat: Show the URL of streaming WASM modules in stack traces

WebAssembly modules compiled through `WebAssembly.compile()` and similar
non-streaming APIs don't have a URL associated to them, because they
have been compiled from a buffer source. In stack traces, V8 will use
a URL such as `wasm://wasm/d1c677ea`, with a hash of the module.

However, wasm modules compiled through streaming APIs, like
`WebAssembly.compileStreaming()`, do have a known URL, which can be
obtained from the `Response` object passed into the streaming APIs. And
as per the developer-facing display conventions in the WebAssembly
Web API spec, this URL should be used in stack traces. This change
implements that.

Closes #12151.

cli/tests/integration/run_tests.rs

@@ -856,11 +856,17 @@ itest!(wasm_async {
 });
 
 itest!(wasm_unreachable {
-  args: "run wasm_unreachable.js",
+  args: "run --allow-read wasm_unreachable.js",
   output: "wasm_unreachable.out",
   exit_code: 1,
 });
 
+itest!(wasm_url {
+  args: "run --quiet --allow-net=localhost:4545 wasm_url.js",
+  output: "wasm_url.out",
+  exit_code: 1,
+});
+
 itest!(weakref {
   args: "run --quiet --reload weakref.ts",
   output: "weakref.ts.out",

cli/tests/testdata/wasm_unreachable.js

@@ -1,50 +1,9 @@
 // WebAssembly module containing a single function with an unreachable instruction
-const binary = Uint8Array.from([
-  0x00,
-  0x61,
-  0x73,
-  0x6d,
-  0x01,
-  0x00,
-  0x00,
-  0x00,
-  0x01,
-  0x04,
-  0x01,
-  0x60,
-  0x00,
-  0x00,
-  0x03,
-  0x02,
-  0x01,
-  0x00,
-  0x07,
-  0x0f,
-  0x01,
-  0x0b,
-  0x75,
-  0x6e,
-  0x72,
-  0x65,
-  0x61,
-  0x63,
-  0x68,
-  0x61,
-  0x62,
-  0x6c,
-  0x65,
-  0x00,
-  0x00,
-  0x0a,
-  0x05,
-  0x01,
-  0x03,
-  0x00,
-  0x00,
-  0x0b,
-]);
+const binary = await Deno.readFile("./unreachable.wasm");
 
 const module = new WebAssembly.Module(binary);
 const instance = new WebAssembly.Instance(module);
 
+// Compare the stack trace with wasm_url.js, which compiles the WASM module with
+// streaming APIs.
 instance.exports.unreachable();

cli/tests/testdata/wasm_unreachable.out

@@ -1,3 +1,3 @@
-error: Uncaught RuntimeError: unreachable
-    at <anonymous> (wasm://wasm/[WILDCARD])
+error: Uncaught (in promise) RuntimeError: unreachable
+    at <anonymous> (wasm://wasm/d1c677ea:1:41)
     at [WILDCARD]/wasm_unreachable.js:[WILDCARD]

cli/tests/testdata/wasm_url.js

@@ -0,0 +1,8 @@
+const module = await WebAssembly.compileStreaming(
+  fetch("http://localhost:4545/unreachable.wasm"),
+);
+const instance = new WebAssembly.Instance(module);
+
+// Compare the stack trace with wasm_unreachable.js, which compiles the WASM
+// module with synchronous APIs.
+instance.exports.unreachable();

cli/tests/testdata/wasm_url.out

@@ -0,0 +1,3 @@
+error: Uncaught (in promise) RuntimeError: unreachable
+    at <anonymous> (http://localhost:4545/unreachable.wasm:1:41)
+    at [WILDCARD]/wasm_url.js:[WILDCARD]

core/lib.deno_core.d.ts

@@ -63,6 +63,8 @@ declare namespace Deno {
      *     compiler. Takes the rid and a `Uint8Array`.
      *   - `op_wasm_streaming_abort`. Aborts the wasm compilation. Takes the rid
      *     and an exception. Invalidates the resource.
+     *   - `op_wasm_streaming_set_url`. Sets a source URL for the wasm module.
+     *     Takes the rid and a string.
      *   - To indicate the end of the resource, use `Deno.core.close()` with the
      *     rid.
      */

core/ops_builtin.rs

@@ -26,6 +26,10 @@ pub(crate) fn init_builtins() -> Extension {
       ("op_resources", op_sync(op_resources)),
       ("op_wasm_streaming_feed", op_sync(op_wasm_streaming_feed)),
       ("op_wasm_streaming_abort", op_sync(op_wasm_streaming_abort)),
+      (
+        "op_wasm_streaming_set_url",
+        op_sync(op_wasm_streaming_set_url),
+      ),
     ])
     .build()
 }
@@ -137,3 +141,16 @@ pub fn op_wasm_streaming_abort(
 
   Ok(())
 }
+
+pub fn op_wasm_streaming_set_url(
+  state: &mut OpState,
+  rid: ResourceId,
+  url: String,
+) -> Result<(), AnyError> {
+  let wasm_streaming =
+    state.resource_table.get::<WasmStreamingResource>(rid)?;
+
+  wasm_streaming.0.borrow_mut().set_url(&url);
+
+  Ok(())
+}

ext/fetch/26_fetch.js

@@ -526,6 +526,9 @@
           throw new TypeError(`HTTP status code ${res.status}`);
         }
 
+        // Pass the resolved URL to v8.
+        core.opSync("op_wasm_streaming_set_url", rid, res.url);
+
         // 2.6.
         // Rather than consuming the body as an ArrayBuffer, this passes each
         // chunk to the feed as soon as it's available.