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-rw-r--r--js/src/jsfun.cpp22
-rw-r--r--js/src/tests/ecma_6/Function/throw-type-error.js16
2 files changed, 38 insertions, 0 deletions
diff --git a/js/src/jsfun.cpp b/js/src/jsfun.cpp
index 3453a59e1..470746d50 100644
--- a/js/src/jsfun.cpp
+++ b/js/src/jsfun.cpp
@@ -861,6 +861,28 @@ CreateFunctionPrototype(JSContext* cx, JSProtoKey key)
if (!throwTypeError || !PreventExtensions(cx, throwTypeError))
return nullptr;
+ // The "length" property of %ThrowTypeError% is non-configurable, adjust
+ // the default property attributes accordingly.
+ Rooted<PropertyDescriptor> nonConfigurableDesc(cx);
+ nonConfigurableDesc.setAttributes(JSPROP_PERMANENT | JSPROP_IGNORE_READONLY |
+ JSPROP_IGNORE_ENUMERATE | JSPROP_IGNORE_VALUE);
+
+ RootedId lengthId(cx, NameToId(cx->names().length));
+ ObjectOpResult lengthResult;
+ if (!NativeDefineProperty(cx, throwTypeError, lengthId, nonConfigurableDesc, lengthResult))
+ return nullptr;
+ MOZ_ASSERT(lengthResult);
+
+ // Non-standard: Also change "name" to non-configurable. ECMAScript defines
+ // %ThrowTypeError% as an anonymous function, i.e. it shouldn't actually
+ // get an own "name" property. To be consistent with other built-in,
+ // anonymous functions, we don't delete %ThrowTypeError%'s "name" property.
+ RootedId nameId(cx, NameToId(cx->names().name));
+ ObjectOpResult nameResult;
+ if (!NativeDefineProperty(cx, throwTypeError, nameId, nonConfigurableDesc, nameResult))
+ return nullptr;
+ MOZ_ASSERT(nameResult);
+
self->setThrowTypeError(throwTypeError);
return functionProto;
diff --git a/js/src/tests/ecma_6/Function/throw-type-error.js b/js/src/tests/ecma_6/Function/throw-type-error.js
new file mode 100644
index 000000000..68dd6e1d0
--- /dev/null
+++ b/js/src/tests/ecma_6/Function/throw-type-error.js
@@ -0,0 +1,16 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+
+const ThrowTypeError = function(){
+ "use strict";
+ return Object.getOwnPropertyDescriptor(arguments, "callee").get;
+}();
+
+assertDeepEq(Object.getOwnPropertyDescriptor(ThrowTypeError, "length"), {
+ value: 0, writable: false, enumerable: false, configurable: false
+});
+
+assertEq(Object.isFrozen(ThrowTypeError), true);
+
+if (typeof reportCompare == "function")
+ reportCompare(true, true);