diff options
| -rw-r--r-- | js/src/jsfun.cpp | 22 | ||||
| -rw-r--r-- | js/src/tests/ecma_6/Function/throw-type-error.js | 16 |
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); |