fix: assign userData to __attribute

[ghost]

Currently, data is not being properly transferred to Fetch.js.
So if I try to get the data in Fetch.js, I get wrong value.

emscripten/src/Fetch.js

Line 294 in df5f6d1

var userData = HEAPU32[fetch_attr + {{{ C_STRUCTS.emscripten_fetch_attr_t.userData }}} >> 2];

console.log(getValue(userData, 'i32'));

[juj]

Hmm, can you instead try the following fix?

diff --git a/src/Fetch.js b/src/Fetch.js
index 758c0385b..314e3224e 100644
--- a/src/Fetch.js
+++ b/src/Fetch.js
@@ -291,7 +291,7 @@ function __emscripten_fetch_xhr(fetch, onsuccess, onerror, onprogress, onreadyst
   var fetch_attr = fetch + {{{ C_STRUCTS.emscripten_fetch_t.__attributes }}};
   var requestMethod = UTF8ToString(fetch_attr);
   if (!requestMethod) requestMethod = 'GET';
-  var userData = HEAPU32[fetch_attr + {{{ C_STRUCTS.emscripten_fetch_attr_t.userData }}} >> 2];
+  var userData = HEAPU32[fetch + {{{ C_STRUCTS.emscripten_fetch_t.userData }}} >> 2];
   var fetchAttributes = HEAPU32[fetch_attr + {{{ C_STRUCTS.emscripten_fetch_attr_t.attributes }}} >> 2];
   var timeoutMsecs = HEAPU32[fetch_attr + {{{ C_STRUCTS.emscripten_fetch_attr_t.timeoutMSecs }}} >> 2];
   var withCredentials = !!HEAPU32[fetch_attr + {{{ C_STRUCTS.emscripten_fetch_attr_t.withCredentials }}} >> 2];

The userData field is present in both the emscripten_fetch_t and emscripten_fetch_attr_t objects - once we have a fetch going on, it should be read from the fetch instance object instead.

If the above patch works, let's land that instead?

[ghost]

@juj
It seems this code isn't related with #11590
I reflect your review 👍

[kripken]

Looks like this is the change @juj suggested so I think we can land this without waiting.

Thanks @TroyTae !

[kripken]

It would also be good to add a test for this.