[wasm64] Fix for bad Memory initial size under firefox

Recent versions of firefox started requiring bigint values for initial
and max memory.

See WebAssembly/memory64#68

Fixes: #22486

Author: sbc100

.circleci/config.yml

@@ -828,7 +828,15 @@ jobs:
           # browser.test_webgl_offscreen_canvas_in_mainthread_after_pthread
           # are crashing Firefox (bugzil.la/1281796). The former case is
           # further blocked by issue #6897.
-          test_targets: "browser skip:browser.test_sdl2_mouse skip:browser.test_html5_webgl_create_context skip:browser.test_webgl_offscreen_canvas_in_pthread skip:browser.test_webgl_offscreen_canvas_in_mainthread_after_pthread skip:browser.test_glut_glutget"
+          test_targets: "
+            browser64.test_dylink_many
+            browser
+            skip:browser.test_sdl2_mouse
+            skip:browser.test_html5_webgl_create_context
+            skip:browser.test_webgl_offscreen_canvas_in_pthread
+            skip:browser.test_webgl_offscreen_canvas_in_mainthread_after_pthread
+            skip:browser.test_glut_glutget
+          "
   # TODO(sbc): Re-enable once we figure out why the emrun tests are
   # locking up.
   #test-browser-chrome-emrun:

src/parseTools.mjs

@@ -1089,6 +1089,13 @@ function ENVIRONMENT_IS_MAIN_THREAD() {
   return '(!(' + envs.join('||') + '))';
 }
 
+function memoryBounds(val) {
+  if (MEMORY64 == 1) {
+    return `toMemoryBounds(${val})`
+  }
+  return val;
+}
+
 addToCompileTimeContext({
   ATEXITS,
   ATINITS,
@@ -1141,6 +1148,7 @@ addToCompileTimeContext({
   makeReturn64,
   makeSetValue,
   makeThrow,
+  memoryBounds,
   modifyJSFunction,
   receiveI64ParamAsI53,
   receiveI64ParamAsI53Unchecked,

src/runtime_init_memory.js

@@ -25,18 +25,31 @@ if (!ENVIRONMENT_IS_PTHREAD) {
 
 #if ASSERTIONS
     assert(INITIAL_MEMORY >= {{{STACK_SIZE}}}, 'INITIAL_MEMORY should be larger than STACK_SIZE, was ' + INITIAL_MEMORY + '! (STACK_SIZE=' + {{{STACK_SIZE}}} + ')');
+#endif
+#if MEMORY64 == 1
+    // Probe for support of bigint bounds with memory64.
+    // TODO(sbc): Remove this once all browsers start requiring bigint here.
+    // See https://github.com/WebAssembly/memory64/issues/68
+    var bigintMemoryBounds = 1;
+    try {
+       new WebAssembly.Memory({'initial': 1n, 'index': 'i64'})
+    } catch (e) {
+      console.log(e);
+      bigintMemoryBounds = 0;
+    }
+    var toMemoryBounds = (i) => bigintMemoryBounds ? BigInt(i) : i;
 #endif
     wasmMemory = new WebAssembly.Memory({
-      'initial': INITIAL_MEMORY / {{{ WASM_PAGE_SIZE }}},
+      'initial': {{{ memoryBounds(`INITIAL_MEMORY / ${WASM_PAGE_SIZE}`) }}},
 #if ALLOW_MEMORY_GROWTH
       // In theory we should not need to emit the maximum if we want "unlimited"
       // or 4GB of memory, but VMs error on that atm, see
       // https://github.com/emscripten-core/emscripten/issues/14130
       // And in the pthreads case we definitely need to emit a maximum. So
       // always emit one.
-      'maximum': {{{ MAXIMUM_MEMORY }}} / {{{ WASM_PAGE_SIZE }}},
+      'maximum': {{{ memoryBounds(MAXIMUM_MEMORY / WASM_PAGE_SIZE }}},
 #else
-      'maximum': INITIAL_MEMORY / {{{ WASM_PAGE_SIZE }}},
+      'maximum': {{{ memoryBounds(`INITIAL_MEMORY / ${WASM_PAGE_SIZE}`) }}},
 #endif // ALLOW_MEMORY_GROWTH
 #if SHARED_MEMORY
       'shared': true,