1 files changed, 78 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/arguments/function_dot_caller_restrictions.js b/js/src/jit-test/tests/arguments/function_dot_caller_restrictions.js
new file mode 100644
index 0000000000..414f348eb6
--- /dev/null
+++ b/js/src/jit-test/tests/arguments/function_dot_caller_restrictions.js
@@ -0,0 +1,78 @@
+
+function g() { }
+function strict() {
+    "use strict";
+}
+
+let bound = g.bind();
+let arrow = x => 0;
+
+async function fn_async() { }
+function * fn_generator() { }
+
+let o = {
+    mtd() {},
+    get x() {},
+    set x(v) {},
+};
+
+class Base { }
+class Derived extends Base { }
+
+function asm_mod() {
+    "use asm";
+    function mtd() {}
+    return { mtd: mtd }
+}
+
+let asm_fun = (new asm_mod).mtd;
+
+let builtin_selfhost = [].sort;
+let builtin_native = Math.sin;
+
+let dot_caller = Object.getOwnPropertyDescriptor(Function.__proto__,
+                                                 "caller").get;
+
+// Returns true if fn.caller is allowed
+function check(fn) {
+    try {
+        (function() {
+            fn.caller;
+        })();
+    }
+    catch (e) {
+        assertEq(e instanceof TypeError, true);
+        return false;
+    }
+    return true;
+}
+
+// Normal sloppy functions are allowed, even if they also are intended as
+// asm.js.
+assertEq(check(g), true);
+assertEq(check(asm_mod), true);
+assertEq(check(asm_fun), true);
+
+// Most others are not
+assertEq(check(strict), false);
+assertEq(check(bound), false);
+assertEq(check(arrow), false);
+assertEq(check(fn_async), false);
+assertEq(check(fn_generator), false);
+assertEq(check(o.mtd), false)
+assertEq(check(Object.getOwnPropertyDescriptor(o, "x").get), false)
+assertEq(check(Object.getOwnPropertyDescriptor(o, "x").set), false)
+assertEq(check(Base), false);
+assertEq(check(Derived), false);
+assertEq(check(builtin_selfhost), false);
+assertEq(check(builtin_native), false);
+assertEq(check(dot_caller), false);
+
+// Have a native invoke .caller on our behalf.
+function foo() {
+    function inner() {
+        return callFunctionFromNativeFrame(dot_caller.bind(inner))
+    }
+    return inner();
+}
+assertEq(foo, foo());