Describe non-callback interface objects with JSClass structures

JS_NewFunction doesn't allow us to set the prototype of the interface objects.

2 files changed, 221 insertions, 52 deletions

diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index b2e51eb4d2a..e126df000ae 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -1861,33 +1861,25 @@ static PrototypeClass: JSClass = JSClass {
 
 class CGInterfaceObjectJSClass(CGThing):
     def __init__(self, descriptor):
+        assert descriptor.interface.hasInterfaceObject() and not descriptor.interface.isCallback()
         CGThing.__init__(self)
         self.descriptor = descriptor
 
     def define(self):
-        if True:
-            return ""
-        ctorname = "0 as *const u8" if not self.descriptor.interface.ctor() else CONSTRUCT_HOOK_NAME
-        hasinstance = HASINSTANCE_HOOK_NAME
+        if self.descriptor.interface.ctor():
+            constructor = CONSTRUCT_HOOK_NAME
+        else:
+            constructor = "throwing_constructor"
+        args = {
+            "constructor": constructor,
+            "hasInstance": HASINSTANCE_HOOK_NAME,
+            "name": self.descriptor.interface.identifier.name,
+        }
         return """\
-const InterfaceObjectClass: JSClass = {
-    %s, 0,
-    JS_PropertyStub,
-    JS_PropertyStub,
-    JS_PropertyStub,
-    JS_StrictPropertyStub,
-    JS_EnumerateStub,
-    JS_ResolveStub,
-    JS_ConvertStub,
-    0 as *const u8,
-    0 as *const u8,
-    %s,
-    %s,
-    %s,
-    0 as *const u8,
-    JSCLASS_NO_INTERNAL_MEMBERS
-};
-""" % (str_to_const_array("Function"), ctorname, hasinstance, ctorname)
+static InterfaceObjectClass: NonCallbackInterfaceObjectClass =
+    NonCallbackInterfaceObjectClass::new(%(constructor)s, %(hasInstance)s,
+                                         fun_to_string);
+""" % args
 
 
 class CGList(CGThing):
@@ -2420,12 +2412,14 @@ assert!(!rval.ptr.is_null());""" % properties))
             else:
                 properties["constructor"] = "throwing_constructor"
                 properties["length"] = 0
-
-            code.append(CGGeneric("""\
+            code.append(CGGeneric("""
+let interface_proto = RootedObject::new(cx, JS_GetFunctionPrototype(cx, global));
+assert!(!interface_proto.ptr.is_null());
 
 create_noncallback_interface_object(cx,
                                     receiver,
-                                    %(constructor)s,
+                                    interface_proto.handle(),
+                                    &InterfaceObjectClass,
                                     %(static_methods)s,
                                     %(static_attrs)s,
                                     %(consts)s,
@@ -4693,6 +4687,44 @@ let args = CallArgs::from_vp(vp, argc);
         return CGList([preamble, callGenerator])
 
 
+class CGClassHasInstanceHook(CGAbstractExternMethod):
+    def __init__(self, descriptor):
+        args = [Argument('*mut JSContext', 'cx'),
+                Argument('HandleObject', 'obj'),
+                Argument('MutableHandleValue', 'value'),
+                Argument('*mut bool', 'rval')]
+        assert descriptor.interface.hasInterfaceObject() and not descriptor.interface.isCallback()
+        CGAbstractExternMethod.__init__(self, descriptor, HASINSTANCE_HOOK_NAME,
+                                        'bool', args)
+
+    def definition_body(self):
+        id = "PrototypeList::ID::%s" % self.descriptor.interface.identifier.name
+        return CGGeneric("""\
+match has_instance(cx, obj, value.handle(), %(id)s, %(index)s) {
+    Ok(result) => {
+        *rval = result;
+        true
+    }
+    Err(()) => false,
+}
+""" % {"id": id, "index": self.descriptor.prototypeDepth})
+
+
+class CGClassFunToStringHook(CGAbstractExternMethod):
+    """
+    A hook to convert functions to strings.
+    """
+    def __init__(self, descriptor):
+        args = [Argument('*mut JSContext', 'cx'), Argument('HandleObject', '_obj'),
+                Argument('u32', '_indent')]
+        CGAbstractExternMethod.__init__(self, descriptor, "fun_to_string", '*mut JSString', args)
+
+    def definition_body(self):
+        name = self.descriptor.interface.identifier.name
+        string = str_to_const_array("function %s() {\\n    [native code]\\n}" % name)
+        return CGGeneric("JS_NewStringCopyZ(cx, %s as *const _ as *const libc::c_char)" % string)
+
+
 class CGClassFinalizeHook(CGAbstractClassHook):
     """
     A hook for finalize, used to release our native object.
@@ -4860,7 +4892,10 @@ class CGDescriptor(CGThing):
                 cgThings.append(CGClassConstructHook(descriptor))
             for ctor in descriptor.interface.namedConstructors:
                 cgThings.append(CGClassConstructHook(descriptor, ctor))
-            cgThings.append(CGInterfaceObjectJSClass(descriptor))
+            if not descriptor.interface.isCallback():
+                cgThings.append(CGInterfaceObjectJSClass(descriptor))
+                cgThings.append(CGClassHasInstanceHook(descriptor))
+                cgThings.append(CGClassFunToStringHook(descriptor))
 
         if not descriptor.interface.isCallback():
             cgThings.append(CGPrototypeJSClass(descriptor))
@@ -5258,8 +5293,8 @@ class CGBindingRoot(CGThing):
             'js::jsapi::{JS_GetObjectPrototype, JS_GetProperty, JS_GetPropertyById}',
             'js::jsapi::{JS_GetPropertyDescriptorById, JS_GetReservedSlot, JS_HasProperty}',
             'js::jsapi::{JS_HasPropertyById, JS_InitializePropertiesFromCompatibleNativeObject}',
-            'js::jsapi::{JS_InternString, JS_IsExceptionPending, JS_NewObject}',
-            'js::jsapi::{JS_NewObjectWithGivenProto, JS_NewObjectWithoutMetadata, JS_SetProperty}',
+            'js::jsapi::{JS_InternString, JS_IsExceptionPending, JS_NewObject, JS_NewObjectWithGivenProto}',
+            'js::jsapi::{JS_NewObjectWithoutMetadata, JS_NewStringCopyZ, JS_SetProperty}',
             'js::jsapi::{JS_SetPrototype, JS_SetReservedSlot, JS_WrapValue, JSAutoCompartment}',
             'js::jsapi::{JSAutoRequest, JSContext, JSClass, JSFreeOp, JSFunctionSpec}',
             'js::jsapi::{JSJitGetterCallArgs, JSJitInfo, JSJitMethodCallArgs, JSJitSetterCallArgs}',
@@ -5279,8 +5314,9 @@ class CGBindingRoot(CGThing):
             'js::rust::{GCMethods, define_methods, define_properties}',
             'dom::bindings',
             'dom::bindings::global::{GlobalRef, global_root_from_object, global_root_from_reflector}',
-            'dom::bindings::interface::{create_callback_interface_object, create_interface_prototype_object}',
-            'dom::bindings::interface::{create_named_constructors, create_noncallback_interface_object}',
+            'dom::bindings::interface::{NonCallbackInterfaceObjectClass, create_callback_interface_object}',
+            'dom::bindings::interface::{create_interface_prototype_object, create_named_constructors}',
+            'dom::bindings::interface::{create_noncallback_interface_object, has_instance}',
             'dom::bindings::js::{JS, Root, RootedReference}',
             'dom::bindings::js::{OptionalRootedReference}',
             'dom::bindings::reflector::{Reflectable}',
diff --git a/components/script/dom/bindings/interface.rs b/components/script/dom/bindings/interface.rs
index cf4b7cc7924..838afc7b166 100644
--- a/components/script/dom/bindings/interface.rs
+++ b/components/script/dom/bindings/interface.rs
@@ -4,17 +4,109 @@
 
 //! Machinery to initialise interface prototype objects and interface objects.
 
+use dom::bindings::codegen::PrototypeList;
+use dom::bindings::conversions::get_dom_class;
 use dom::bindings::utils::{ConstantSpec, NonNullJSNative, define_constants};
-use js::jsapi::{HandleObject, JSClass, JSContext, JSFunctionSpec};
-use js::jsapi::{JSObject, JSPropertySpec, JS_DefineProperty1, JS_DefineProperty2};
-use js::jsapi::{JS_GetFunctionObject, JS_InternString, JS_LinkConstructorAndPrototype};
-use js::jsapi::{JS_NewFunction, JS_NewObject, JS_NewObjectWithUniqueType};
-use js::jsapi::{MutableHandleObject, RootedObject, RootedString};
+use js::glue::UncheckedUnwrapObject;
+use js::jsapi::{Class, ClassExtension, ClassSpec, HandleObject, HandleValue, JSClass};
+use js::jsapi::{JSContext, JSFunctionSpec, JSObject, JSPropertySpec, JSString};
+use js::jsapi::{JS_DefineProperty1, JS_DefineProperty2, JS_DefineProperty4};
+use js::jsapi::{JS_GetFunctionObject, JS_GetPrototype, JS_InternString};
+use js::jsapi::{JS_LinkConstructorAndPrototype, JS_NewFunction, JS_NewObject};
+use js::jsapi::{JS_NewObjectWithUniqueType, MutableHandleObject, MutableHandleValue};
+use js::jsapi::{ObjectOps, RootedObject, RootedString, Value};
 use js::rust::{define_methods, define_properties};
 use js::{JSFUN_CONSTRUCTOR, JSPROP_PERMANENT, JSPROP_READONLY};
 use libc;
 use std::ptr;
 
+/// A constructor class hook.
+pub type ConstructorClassHook =
+    unsafe extern "C" fn(cx: *mut JSContext, argc: u32, vp: *mut Value) -> bool;
+
+/// A has_instance class hook.
+pub type HasInstanceClassHook =
+    unsafe extern "C" fn(cx: *mut JSContext,
+                         obj: HandleObject,
+                         vp: MutableHandleValue,
+                         bp: *mut bool)
+                         -> bool;
+
+/// A fun_to_string class hook.
+pub type FunToStringHook =
+    unsafe extern "C" fn(cx: *mut JSContext,
+                         obj: HandleObject,
+                         indent: u32)
+                         -> *mut JSString;
+
+/// The class of a non-callback interface object.
+#[derive(Copy, Clone)]
+pub struct NonCallbackInterfaceObjectClass {
+    /// The SpiderMonkey Class structure.
+    pub class: Class,
+}
+unsafe impl Sync for NonCallbackInterfaceObjectClass {}
+
+impl NonCallbackInterfaceObjectClass {
+    /// Create a new `NonCallbackInterfaceObjectClass` structure.
+    pub const fn new(
+            constructor: ConstructorClassHook,
+            has_instance: HasInstanceClassHook,
+            fun_to_string: FunToStringHook)
+            -> NonCallbackInterfaceObjectClass {
+        NonCallbackInterfaceObjectClass {
+            class: Class {
+                name: b"Function\0" as *const _ as *const libc::c_char,
+                flags: 0,
+                addProperty: None,
+                delProperty: None,
+                getProperty: None,
+                setProperty: None,
+                enumerate: None,
+                resolve: None,
+                convert: None,
+                finalize: None,
+                call: Some(constructor),
+                hasInstance: Some(has_instance),
+                construct: Some(constructor),
+                trace: None,
+                spec: ClassSpec {
+                    createConstructor: None,
+                    createPrototype: None,
+                    constructorFunctions: ptr::null(),
+                    constructorProperties: ptr::null(),
+                    prototypeFunctions: ptr::null(),
+                    prototypeProperties: ptr::null(),
+                    finishInit: None,
+                    flags: 0,
+                },
+                ext: ClassExtension {
+                    outerObject: None,
+                    innerObject: None,
+                    isWrappedNative: false,
+                    weakmapKeyDelegateOp: None,
+                    objectMovedOp: None,
+                },
+                ops: ObjectOps {
+                    lookupProperty: None,
+                    defineProperty: None,
+                    hasProperty: None,
+                    getProperty: None,
+                    setProperty: None,
+                    getOwnPropertyDescriptor: None,
+                    deleteProperty: None,
+                    watch: None,
+                    unwatch: None,
+                    getElements: None,
+                    enumerate: None,
+                    thisObject: None,
+                    funToString: Some(fun_to_string),
+                }
+            },
+        }
+    }
+}
+
 /// Create and define the interface object of a callback interface.
 pub unsafe fn create_callback_interface_object(
         cx: *mut JSContext,
@@ -45,31 +137,26 @@ pub unsafe fn create_interface_prototype_object(
 pub unsafe fn create_noncallback_interface_object(
         cx: *mut JSContext,
         receiver: HandleObject,
-        constructor_native: NonNullJSNative,
+        proto: HandleObject,
+        class: &'static NonCallbackInterfaceObjectClass,
         static_methods: Option<&'static [JSFunctionSpec]>,
         static_properties: Option<&'static [JSPropertySpec]>,
         constants: &'static [ConstantSpec],
         interface_prototype_object: HandleObject,
         name: &'static [u8],
         length: u32) {
-    assert!(!interface_prototype_object.ptr.is_null());
-
-    let interface_object =
-        RootedObject::new(cx, create_constructor(cx, constructor_native, length, name));
-    assert!(!interface_object.ptr.is_null());
-
-    if let Some(static_methods) = static_methods {
-        define_methods(cx, interface_object.handle(), static_methods).unwrap();
-    }
-
-    if let Some(static_properties) = static_properties {
-        define_properties(cx, interface_object.handle(), static_properties).unwrap();
-    }
-
-    define_constants(cx, interface_object.handle(), constants);
-
+    let mut interface_object = RootedObject::new(cx, ptr::null_mut());
+    create_object(cx,
+                  proto,
+                  &*(class as *const _ as *const JSClass),
+                  static_methods,
+                  static_properties,
+                  constants,
+                  interface_object.handle_mut());
     assert!(JS_LinkConstructorAndPrototype(cx, interface_object.handle(),
                                            interface_prototype_object));
+    define_name(cx, interface_object.handle(), name);
+    define_length(cx, interface_object.handle(), length);
     define_on_global_object(cx, receiver, name, interface_object.handle());
 }
 
@@ -99,6 +186,43 @@ pub unsafe fn create_named_constructors(
     }
 }
 
+/// Return whether a value is an instance of a given prototype.
+/// http://heycam.github.io/webidl/#es-interface-hasinstance
+pub unsafe fn has_instance(
+        cx: *mut JSContext,
+        prototype: HandleObject,
+        value: HandleValue,
+        id: PrototypeList::ID,
+        index: usize)
+        -> Result<bool, ()> {
+    if !value.is_object() {
+        // Step 1.
+        return Ok(false);
+    }
+    let mut value = RootedObject::new(cx, value.to_object());
+
+    // Steps 2-3 only concern callback interface objects.
+
+    if let Ok(dom_class) = get_dom_class(UncheckedUnwrapObject(value.ptr, /* stopAtOuter = */ 0)) {
+        if dom_class.interface_chain[index] == id {
+            // Step 4.
+            return Ok(true);
+        }
+    }
+
+    while JS_GetPrototype(cx, value.handle(), value.handle_mut()) {
+        if value.ptr.is_null() {
+            // Step 5.2.
+            return Ok(false);
+        } else if value.ptr as *const _ == prototype.ptr {
+            // Step 5.3.
+            return Ok(true);
+        }
+    }
+    // JS_GetPrototype threw an exception.
+    Err(())
+}
+
 unsafe fn create_constructor(
         cx: *mut JSContext,
         constructor_native: NonNullJSNative,
@@ -152,6 +276,15 @@ unsafe fn define_name(cx: *mut JSContext, obj: HandleObject, name: &'static [u8]
                                None, None));
 }
 
+unsafe fn define_length(cx: *mut JSContext, obj: HandleObject, length: u32) {
+    assert!(JS_DefineProperty4(cx,
+                               obj,
+                               b"length\0".as_ptr() as *const libc::c_char,
+                               length,
+                               JSPROP_READONLY,
+                               None, None));
+}
+
 unsafe fn define_on_global_object(
         cx: *mut JSContext,
         receiver: HandleObject,