1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/ion/spreadcall-not-optimized-dynamic-1.js b/js/src/jit-test/tests/ion/spreadcall-not-optimized-dynamic-1.js
new file mode 100644
index 0000000000..01b5745cc7
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+++ b/js/src/jit-test/tests/ion/spreadcall-not-optimized-dynamic-1.js
@@ -0,0 +1,44 @@
+// Tests when JSOP_OPTIMIZE_SPREADCALL no longer apply after the initial Ion
+// compilation.
+
+// JSOP_OPTIMIZE_SPREADCALL can be optimised when the following conditions
+// are fulfilled:
+//   (1) the argument is an array
+//   (2) the array has no hole
+//   (3) array[@@iterator] is not modified
+//   (4) the array's prototype is Array.prototype
+//   (5) Array.prototype[@@iterator] is not modified
+//   (6) %ArrayIteratorPrototype%.next is not modified
+
+function add(a, b) {
+    return a + b;
+}
+
+// The rest argument is overwritten with a non-Array object.
+function test() {
+    var badRest = {
+        *[Symbol.iterator]() {
+            yield 3;
+            yield 4;
+        }
+    };
+    function maybeInvalidate(rest) {
+        // Use a WithStatement to prevent Ion-inlining. This ensures any
+        // bailouts due to type changes don't occur in this function, but
+        // instead in the caller.
+        with ({});
+
+        if (i >= 1900) {
+            return badRest;
+        }
+        return rest;
+    }
+    function fn(...rest) {
+        rest = maybeInvalidate(rest);
+        return add(...rest);
+    }
+    for (var i = 0; i < 4000; ++i) {
+        assertEq(fn(1, 2), i < 1900 ? 3 : 7);
+    }
+}
+test();