wasm: support shared memory

Author: ypsvlq

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         - wasm32-freestanding
     runs-on: ubuntu-latest
     env:
-      build: zig build -Dtarget=${{ matrix.target }} ${{ matrix.target == 'native' && '-fsys=wio' || '' }}
+      build: zig build -Dtarget=${{ matrix.target }} ${{ matrix.target == 'wasm32-freestanding' && '-Dcpu=bleeding_edge' || '' }} ${{ matrix.target == 'native' && '-fsys=wio' || '' }}
     steps:
     - name: Checkout
       uses: actions/checkout@v6

demo/build.zig

@@ -47,6 +47,11 @@ pub fn build(b: *std.Build) void {
         });
         b.installArtifact(exe);
 
+        if (target.result.cpu.arch.isWasm()) {
+            exe.max_memory = 2 * 1024 * 1024;
+            exe.shared_memory = true;
+        }
+
         const run_cmd = b.addRunArtifact(exe);
         run_cmd.step.dependOn(b.getInstallStep());
 

demo/wasm.js

@@ -13,7 +13,7 @@ class GL {
             const array = new Uint8Array(wio.instance.exports.memory.buffer, ptr);
             let len = 0;
             while (array[len]) len++;
-            return new TextDecoder().decode(array.subarray(0, len));
+            return new TextDecoder().decode(array.slice(0, len));
         };
 
         this.setStringZ = (ptr, max, length, string) => {

src/wasm/Wio.js

@@ -42,7 +42,7 @@ class Wio {
     }
 
     getString(ptr, len) {
-        return new TextDecoder().decode(new Uint8Array(this.instance.exports.memory.buffer, ptr, len));
+        return new TextDecoder().decode(new Uint8Array(this.instance.exports.memory.buffer, ptr, len).slice());
     }
 
     updateModifiers(data, event) {