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-rw-r--r--testing/web-platform/tests/common/sab.js21
1 files changed, 21 insertions, 0 deletions
diff --git a/testing/web-platform/tests/common/sab.js b/testing/web-platform/tests/common/sab.js
new file mode 100644
index 0000000000..a3ea610e16
--- /dev/null
+++ b/testing/web-platform/tests/common/sab.js
@@ -0,0 +1,21 @@
+const createBuffer = (() => {
+ // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
+ let sabConstructor;
+ try {
+ sabConstructor = new WebAssembly.Memory({ shared:true, initial:0, maximum:0 }).buffer.constructor;
+ } catch(e) {
+ sabConstructor = null;
+ }
+ return (type, length, opts) => {
+ if (type === "ArrayBuffer") {
+ return new ArrayBuffer(length, opts);
+ } else if (type === "SharedArrayBuffer") {
+ if (sabConstructor && sabConstructor.name !== "SharedArrayBuffer") {
+ throw new Error("WebAssembly.Memory does not support shared:true");
+ }
+ return new sabConstructor(length, opts);
+ } else {
+ throw new Error("type has to be ArrayBuffer or SharedArrayBuffer");
+ }
+ }
+})();