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-rw-r--r--js/src/jit-test/tests/fields/ion-private-idempotent.js33
1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/fields/ion-private-idempotent.js b/js/src/jit-test/tests/fields/ion-private-idempotent.js
new file mode 100644
index 0000000000..24d7c1793e
--- /dev/null
+++ b/js/src/jit-test/tests/fields/ion-private-idempotent.js
@@ -0,0 +1,33 @@
+// |jit-test| --enable-private-fields;
+
+var acc = 0;
+const loopCount = 100;
+
+class A {
+ #x = 1;
+ static loopRead(o) {
+ for (var i = 0; i < loopCount; i++) {
+ // If this getelem were hoisted out of the loop,
+ // we need the IC that is attached to that to
+ // correctly throw if .#x is not in o.
+ var b = o.#x;
+ acc += 1;
+ }
+ }
+};
+
+// Two non-A objects, because we're concerned not about the first
+// attempt to read .#x from a non A, but the second, because if
+// we attach the wrong IC, we'll attach an IC that provides
+// regular object semantics, which would be to return undefined.
+var array = [new A, new A, new A, {}, {}];
+for (var e of array) {
+ acc = 0;
+ try {
+ A.loopRead(e);
+ assertEq(acc, loopCount);
+ } catch (e) {
+ assertEq(e instanceof TypeError, true);
+ assertEq(acc, 0);
+ }
+}