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Merge pull request #7272 from nic-vdwalt/wasm-js-shared-memory

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core/sys/wasm/js: support shared WebAssembly memory in browser APIs
This commit is contained in:
gingerBill
2026-08-18 20:11:55 +02:00
committed by GitHub
parent 9870cd4c36 9b7bc2da12
commit 64ac30e803
1 changed files with 20 additions and 2 deletions
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22
core/sys/wasm/js/odin.js
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@@ -19,6 +19,8 @@ class WasmMemoryInterface {
this.exports = null;
this.listenerMap = new Map();
this.isShared = false;
// Size (in bytes) of the integer type, should be 4 on `js_wasm32` and 8 on `js_wasm64p32`
this.intSize = 4;
}
@@ -29,6 +31,9 @@ class WasmMemoryInterface {
setMemory(memory) {
this.memory = memory;
// Avoid instanceof because memory may come from another realm.
this.isShared = typeof SharedArrayBuffer !== "undefined" && memory != null &&
Object.prototype.toString.call(memory.buffer) === "[object SharedArrayBuffer]";
}
setExports(exports) {
@@ -96,9 +101,16 @@ class WasmMemoryInterface {
return new Uint8Array(this.memory.buffer, ptr, Number(len));
}
loadBytesUnshared(ptr, len) {
const bytes = this.loadBytes(ptr, len);
if (this.isShared) {
return bytes.slice();
}
return bytes;
}
loadString(ptr, len) {
const bytes = this.loadBytes(ptr, Number(len));
return new TextDecoder().decode(bytes);
return new TextDecoder().decode(this.loadBytesUnshared(ptr, Number(len)));
}
loadCstring(ptr) {
@@ -1612,6 +1624,12 @@ function odinSetupDefaultImports(wasmMemoryInterface, consoleElement, memory) {
rand_bytes: (ptr, len) => {
const view = new Uint8Array(wasmMemoryInterface.memory.buffer, ptr, len)
if (wasmMemoryInterface.isShared) {
const tmp = new Uint8Array(len)
crypto.getRandomValues(tmp)
view.set(tmp)
return
}
crypto.getRandomValues(view)
},
},