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More miscellaneous script splitting changes (#36220)

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* script: Move HasParent to script_bindings and update imports for InheritTypes.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Make principal creation generic over DOM interface.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Move a bunch of proxy-related code to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Make some proxy-related code generic over the DOM interface.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Move DomSlice to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Move some utility bindings code to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Make enumerating and resolving globals generic over the DOM interface.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Make realm helpers generic over the DOM interface.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Move implementations on concrete DOM types to concrete bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Make additional codegen helpers generic over the DOM interface.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Make iterator creation generic over the DOM interface.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Make reporting an exception a generic operation.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* script: Move AsCCharPtrPtr to script_bindings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Formatting.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

* Address clippy warnings.

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-03-30 07:06:30 -04:00 • committed by GitHub
parent 971490084e
commit b445053a7c
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33 changed files with 806 additions and 628 deletions
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1
components/script_bindings/codegen/Bindings.conf
View file

@ -588,6 +588,7 @@ DOMInterfaces = {
'Window': {
'canGc': ['Stop', 'Fetch', 'Scroll', 'Scroll_','ScrollBy', 'ScrollBy_', 'Stop', 'Fetch', 'Open', 'CreateImageBitmap'],
'inRealms': ['Fetch', 'GetOpener'],
'additionalTraits': ['script_bindings::interfaces::WindowHelpers'],
},
'WindowProxy' : {

107
components/script_bindings/codegen/CodegenRust.py
View file

@ -2279,8 +2279,6 @@ class CGImports(CGWrapper):
if t.isInterface() or t.isNamespace():
name = getIdentifier(t).name
descriptor = descriptorProvider.getDescriptor(name)
if name != 'GlobalScope':
extras += [descriptor.path]
parentName = descriptor.getParentName()
while parentName:
descriptor = descriptorProvider.getDescriptor(parentName)
@ -2289,7 +2287,7 @@ class CGImports(CGWrapper):
elif t.isType() and t.isRecord():
extras += ['script_bindings::record::Record']
elif isinstance(t, IDLPromiseType):
extras += ['crate::dom::promise::Promise']
pass
else:
if t.isEnum():
extras += [f'{getModuleFromObject(t)}::{getIdentifier(t).name}Values']
@ -2339,15 +2337,15 @@ def DOMClassTypeId(desc):
inner = ""
if desc.hasDescendants():
if desc.interface.getExtendedAttribute("Abstract"):
return "crate::dom::bindings::codegen::InheritTypes::TopTypeId { abstract_: () }"
return "script_bindings::codegen::InheritTypes::TopTypeId { abstract_: () }"
name = desc.interface.identifier.name
inner = f"(crate::dom::bindings::codegen::InheritTypes::{name}TypeId::{name})"
inner = f"(script_bindings::codegen::InheritTypes::{name}TypeId::{name})"
elif len(protochain) == 1:
return "crate::dom::bindings::codegen::InheritTypes::TopTypeId { alone: () }"
return "script_bindings::codegen::InheritTypes::TopTypeId { alone: () }"
reversed_protochain = list(reversed(protochain))
for (child, parent) in zip(reversed_protochain, reversed_protochain[1:]):
inner = f"(crate::dom::bindings::codegen::InheritTypes::{parent}TypeId::{child}{inner})"
return f"crate::dom::bindings::codegen::InheritTypes::TopTypeId {{ {protochain[0].lower()}: {inner} }}"
inner = f"(script_bindings::codegen::InheritTypes::{parent}TypeId::{child}{inner})"
return f"script_bindings::codegen::InheritTypes::TopTypeId {{ {protochain[0].lower()}: {inner} }}"
def DOMClass(descriptor):
@ -2398,10 +2396,10 @@ class CGDOMJSClass(CGThing):
}
if self.descriptor.isGlobal():
assert not self.descriptor.weakReferenceable
args["enumerateHook"] = "Some(enumerate_global)"
args["enumerateHook"] = "Some(enumerate_global::<D>)"
args["flags"] = "JSCLASS_IS_GLOBAL | JSCLASS_DOM_GLOBAL | JSCLASS_FOREGROUND_FINALIZE"
args["slots"] = "JSCLASS_GLOBAL_SLOT_COUNT + 1"
args["resolveHook"] = "Some(resolve_global)"
args["resolveHook"] = "Some(resolve_global::<D>)"
args["traceHook"] = "js::jsapi::JS_GlobalObjectTraceHook"
elif self.descriptor.weakReferenceable:
args["slots"] = "2"
@ -2423,7 +2421,7 @@ pub(crate) fn init_class_ops<D: DomTypes>() {{
}});
}}
static Class: ThreadUnsafeOnceLock<DOMJSClass> = ThreadUnsafeOnceLock::new();
pub(crate) static Class: ThreadUnsafeOnceLock<DOMJSClass> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_domjs_class<D: DomTypes>() {{
init_class_ops::<D>();
@ -3185,7 +3183,7 @@ let raw = Root::new(MaybeUnreflectedDom::from_box(object));
let origin = (*raw.as_ptr()).upcast::<D::GlobalScope>().origin();
rooted!(in(*cx) let mut obj = ptr::null_mut::<JSObject>());
create_global_object(
create_global_object::<D>(
cx,
&Class.get().base,
raw.as_ptr() as *const libc::c_void,
@ -3229,14 +3227,15 @@ class CGIDLInterface(CGThing):
def define(self):
interface = self.descriptor.interface
name = interface.identifier.name
bindingModule = f"crate::dom::bindings::codegen::GenericBindings::{toBindingPath(self.descriptor)}"
if (interface.getUserData("hasConcreteDescendant", False)
or interface.getUserData("hasProxyDescendant", False)):
depth = self.descriptor.prototypeDepth
check = f"class.interface_chain[{depth}] == PrototypeList::ID::{name}"
elif self.descriptor.proxy:
check = "ptr::eq(class, unsafe { Class.get() })"
check = f"ptr::eq(class, unsafe {{ {bindingModule}::Class.get() }})"
else:
check = "ptr::eq(class, unsafe { &Class.get().dom_class })"
check = f"ptr::eq(class, unsafe {{ &{bindingModule}::Class.get().dom_class }})"
return f"""
impl IDLInterface for {name} {{
#[inline]
@ -3279,6 +3278,7 @@ class CGDomObjectWrap(CGThing):
def define(self):
ifaceName = self.descriptor.interface.identifier.name
bindingModule = f"crate::dom::bindings::codegen::GenericBindings::{toBindingPath(self.descriptor)}"
return f"""
impl DomObjectWrap<crate::DomTypeHolder> for {firstCap(ifaceName)} {{
const WRAP: unsafe fn(
@ -3287,7 +3287,7 @@ impl DomObjectWrap<crate::DomTypeHolder> for {firstCap(ifaceName)} {{
Option<HandleObject>,
Box<Self>,
CanGc,
) -> Root<Dom<Self>> = Wrap::<crate::DomTypeHolder>;
) -> Root<Dom<Self>> = {bindingModule}::Wrap::<crate::DomTypeHolder>;
}}
"""
@ -3303,6 +3303,7 @@ class CGDomObjectIteratorWrap(CGThing):
def define(self):
assert self.descriptor.interface.isIteratorInterface()
name = self.descriptor.interface.iterableInterface.identifier.name
bindingModule = f"crate::dom::bindings::codegen::GenericBindings::{toBindingPath(self.descriptor)}"
return f"""
impl DomObjectIteratorWrap<crate::DomTypeHolder> for {name} {{
const ITER_WRAP: unsafe fn(
@ -3311,7 +3312,7 @@ impl DomObjectIteratorWrap<crate::DomTypeHolder> for {name} {{
Option<HandleObject>,
Box<IterableIterator<crate::DomTypeHolder, Self>>,
CanGc,
) -> Root<Dom<IterableIterator<crate::DomTypeHolder, Self>>> = Wrap::<crate::DomTypeHolder>;
) -> Root<Dom<IterableIterator<crate::DomTypeHolder, Self>>> = {bindingModule}::Wrap::<crate::DomTypeHolder>;
}}
"""
@ -3516,7 +3517,7 @@ assert!(!prototype_proto.is_null());""")]
assert not self.haveUnscopables
code.append(CGGeneric(f"""
rooted!(in(*cx) let mut prototype_proto_proto = prototype_proto.get());
dom::types::{name}::create_named_properties_object(cx, prototype_proto_proto.handle(), prototype_proto.handle_mut());
D::{name}::create_named_properties_object(cx, prototype_proto_proto.handle(), prototype_proto.handle_mut());
assert!(!prototype_proto.is_null());"""))
properties = {
@ -3797,7 +3798,7 @@ class CGDefineProxyHandler(CGAbstractMethod):
# `[[Set]]` (https://heycam.github.io/webidl/#legacy-platform-object-set) (yet).
assert not self.descriptor.operations['IndexedGetter']
assert not self.descriptor.operations['NamedGetter']
customSet = 'Some(proxyhandler::maybe_cross_origin_set_rawcx)'
customSet = 'Some(proxyhandler::maybe_cross_origin_set_rawcx::<D>)'
getOwnEnumerablePropertyKeys = "own_property_keys::<D>"
if self.descriptor.interface.getExtendedAttribute("LegacyUnenumerableNamedProperties") or \
@ -3944,7 +3945,7 @@ class CGCallGenerator(CGThing):
call = CGList([call, CGWrapper(args, pre="(", post=")")])
if hasCEReactions:
self.cgRoot.append(CGGeneric("push_new_element_queue();\n"))
self.cgRoot.append(CGGeneric("<D as DomHelpers<D>>::push_new_element_queue();\n"))
self.cgRoot.append(CGList([
CGGeneric("let result: "),
@ -3955,7 +3956,7 @@ class CGCallGenerator(CGThing):
]))
if hasCEReactions:
self.cgRoot.append(CGGeneric("pop_current_element_queue(CanGc::note());\n"))
self.cgRoot.append(CGGeneric("<D as DomHelpers<D>>::pop_current_element_queue(CanGc::note());\n"))
if isFallible:
if static:
@ -3967,7 +3968,7 @@ class CGCallGenerator(CGThing):
"let result = match result {\n"
" Ok(result) => result,\n"
" Err(e) => {\n"
f" <D as DomHelpers<D>>::throw_dom_exception(cx, {glob}, e);\n"
f" <D as DomHelpers<D>>::throw_dom_exception(cx, {glob}, e, CanGc::note());\n"
f" return{errorResult};\n"
" },\n"
"};"))
@ -5911,14 +5912,14 @@ class CGDOMJSProxyHandler_getOwnPropertyDescriptor(CGAbstractExternMethod):
if self.descriptor.isMaybeCrossOriginObject():
get += dedent(
"""
if !proxyhandler::is_platform_object_same_origin(cx, proxy) {
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
if !proxyhandler::cross_origin_get_own_property_helper(
cx, proxy, CROSS_ORIGIN_PROPERTIES.get(), id, desc, &mut *is_none
) {
return false;
}
if *is_none {
return proxyhandler::cross_origin_property_fallback(cx, proxy, id, desc, &mut *is_none);
return proxyhandler::cross_origin_property_fallback::<D>(cx, proxy, id, desc, &mut *is_none);
}
return true;
}
@ -6033,8 +6034,8 @@ class CGDOMJSProxyHandler_defineProperty(CGAbstractExternMethod):
if self.descriptor.isMaybeCrossOriginObject():
set += dedent(
"""
if !proxyhandler::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::report_cross_origin_denial(cx, id, "define");
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::report_cross_origin_denial::<D>(cx, id, "define");
}
// Safe to enter the Realm of proxy now.
@ -6092,8 +6093,8 @@ class CGDOMJSProxyHandler_delete(CGAbstractExternMethod):
if self.descriptor.isMaybeCrossOriginObject():
set += dedent(
"""
if !proxyhandler::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::report_cross_origin_denial(cx, id, "delete");
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::report_cross_origin_denial::<D>(cx, id, "delete");
}
// Safe to enter the Realm of proxy now.
@ -6131,7 +6132,7 @@ class CGDOMJSProxyHandler_ownPropertyKeys(CGAbstractExternMethod):
if self.descriptor.isMaybeCrossOriginObject():
body += dedent(
"""
if !proxyhandler::is_platform_object_same_origin(cx, proxy) {
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::cross_origin_own_property_keys(
cx, proxy, CROSS_ORIGIN_PROPERTIES.get(), props
);
@ -6204,7 +6205,7 @@ class CGDOMJSProxyHandler_getOwnEnumerablePropertyKeys(CGAbstractExternMethod):
if self.descriptor.isMaybeCrossOriginObject():
body += dedent(
"""
if !proxyhandler::is_platform_object_same_origin(cx, proxy) {
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
// There are no enumerable cross-origin props, so we're done.
return true;
}
@ -6255,7 +6256,7 @@ class CGDOMJSProxyHandler_hasOwn(CGAbstractExternMethod):
if self.descriptor.isMaybeCrossOriginObject():
indexed += dedent(
"""
if !proxyhandler::is_platform_object_same_origin(cx, proxy) {
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::cross_origin_has_own(
cx, proxy, CROSS_ORIGIN_PROPERTIES.get(), id, bp
);
@ -6328,8 +6329,8 @@ class CGDOMJSProxyHandler_get(CGAbstractExternMethod):
if self.descriptor.isMaybeCrossOriginObject():
maybeCrossOriginGet = dedent(
"""
if !proxyhandler::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::cross_origin_get(cx, proxy, receiver, id, vp);
if !<D as DomHelpers<D>>::is_platform_object_same_origin(cx, proxy) {
return proxyhandler::cross_origin_get::<D>(cx, proxy, receiver, id, vp);
}
// Safe to enter the Realm of proxy now.
@ -6589,7 +6590,7 @@ class CGDOMJSProxyHandlerDOMClass(CGThing):
def define(self):
return f"""
static Class: ThreadUnsafeOnceLock<DOMClass> = ThreadUnsafeOnceLock::new();
pub(crate) static Class: ThreadUnsafeOnceLock<DOMClass> = ThreadUnsafeOnceLock::new();
pub(crate) fn init_proxy_handler_dom_class<D: DomTypes>() {{
Class.set({DOMClass(self.descriptor)});
@ -6990,18 +6991,11 @@ class CGDescriptor(CGThing):
pass
else:
cgThings.append(CGDOMJSClass(descriptor))
if not descriptor.interface.isIteratorInterface():
cgThings.append(CGAssertInheritance(descriptor))
pass
if descriptor.isGlobal():
cgThings.append(CGWrapGlobalMethod(descriptor, properties))
else:
cgThings.append(CGWrapMethod(descriptor))
if descriptor.interface.isIteratorInterface():
cgThings.append(CGDomObjectIteratorWrap(descriptor))
else:
cgThings.append(CGDomObjectWrap(descriptor))
reexports.append('Wrap')
haveUnscopables = False
@ -7013,16 +7007,6 @@ class CGDescriptor(CGThing):
CGIndenter(CGList([CGGeneric(str_to_cstr(name)) for
name in unscopableNames], ",\n")),
CGGeneric("];\n")], "\n"))
if (
(descriptor.concrete or descriptor.hasDescendants())
and not descriptor.interface.isIteratorInterface()
):
cgThings.append(CGIDLInterface(descriptor))
if descriptor.interface.isIteratorInterface():
cgThings.append(CGIteratorDerives(descriptor))
if descriptor.weakReferenceable:
cgThings.append(CGWeakReferenceableTrait(descriptor))
if not descriptor.interface.isCallback():
interfaceTrait = CGInterfaceTrait(descriptor, config.getDescriptorProvider())
@ -7590,6 +7574,27 @@ class CGConcreteBindingRoot(CGThing):
f"pub(crate) use {originalBinding}::{firstCap(ifaceName)}_Binding as {firstCap(ifaceName)}_Binding;"
),
]
if d.concrete:
if not d.interface.isIteratorInterface():
cgthings.append(CGAssertInheritance(d))
else:
cgthings.append(CGIteratorDerives(d))
if (
(d.concrete or d.hasDescendants())
and not d.interface.isIteratorInterface()
):
cgthings.append(CGIDLInterface(d))
if d.interface.isIteratorInterface():
cgthings.append(CGDomObjectIteratorWrap(d))
elif d.concrete and not d.isGlobal():
cgthings.append(CGDomObjectWrap(d))
if d.weakReferenceable:
cgthings.append(CGWeakReferenceableTrait(d))
if not d.interface.isCallback():
traitName = f"{ifaceName}Methods"
cgthings += [
@ -7625,7 +7630,7 @@ pub(crate) fn GetConstructorObject(
curr = CGImports(curr, descriptors=[], callbacks=[],
dictionaries=[], enums=[], typedefs=[],
imports=[
'crate::dom::bindings::import::base::*',
'crate::dom::bindings::import::module::*',
'crate::dom::types::*'],
config=config)

7
components/script_bindings/inheritance.rs
View file

@ -51,3 +51,10 @@ pub trait Castable: IDLInterface + DomObject + Sized {
}
}
}
#[allow(missing_docs)]
pub trait HasParent {
#[cfg_attr(crown, crown::unrooted_must_root_lint::must_root)]
type Parent;
fn as_parent(&self) -> &Self::Parent;
}

10
components/script_bindings/interfaces.rs
View file

@ -2,7 +2,7 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use js::rust::HandleObject;
use js::rust::{HandleObject, MutableHandleObject};
use crate::script_runtime::JSContext;
@ -22,3 +22,11 @@ pub trait TestBindingHelpers {
pub trait WebGL2RenderingContextHelpers {
fn is_webgl2_enabled(cx: JSContext, global: HandleObject) -> bool;
}
pub trait WindowHelpers {
fn create_named_properties_object(
cx: JSContext,
proto: HandleObject,
object: MutableHandleObject,
);
}

1
components/script_bindings/lib.rs
View file

@ -28,6 +28,7 @@ pub mod iterable;
pub mod like;
pub mod lock;
pub mod num;
pub mod proxyhandler;
pub mod record;
pub mod reflector;
pub mod root;

494
components/script_bindings/proxyhandler.rs Normal file
View file

@ -0,0 +1,494 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! Utilities for the implementation of JSAPI proxy handlers.
use std::ffi::CStr;
use std::os::raw::c_char;
use std::ptr;
use js::glue::{GetProxyHandlerFamily, GetProxyPrivate, SetProxyPrivate};
use js::jsapi::{
DOMProxyShadowsResult, GetStaticPrototype, GetWellKnownSymbol, Handle as RawHandle,
HandleId as RawHandleId, HandleObject as RawHandleObject, JS_AtomizeAndPinString,
JS_DefinePropertyById, JS_GetOwnPropertyDescriptorById, JSContext, JSErrNum, JSFunctionSpec,
JSObject, JSPropertySpec, MutableHandle as RawMutableHandle,
MutableHandleIdVector as RawMutableHandleIdVector,
MutableHandleObject as RawMutableHandleObject, ObjectOpResult, PropertyDescriptor,
SetDOMProxyInformation, SymbolCode, jsid,
};
use js::jsid::SymbolId;
use js::jsval::{ObjectValue, UndefinedValue};
use js::rust::wrappers::{
AppendToIdVector, JS_AlreadyHasOwnPropertyById, JS_NewObjectWithGivenProto,
RUST_INTERNED_STRING_TO_JSID, SetDataPropertyDescriptor,
};
use js::rust::{Handle, HandleObject, HandleValue, MutableHandle, MutableHandleObject};
use js::{jsapi, rooted};
use crate::conversions::{is_dom_proxy, jsid_to_string, jsstring_to_str};
use crate::script_runtime::JSContext as SafeJSContext;
use crate::str::DOMString;
use crate::utils::delete_property_by_id;
/// Determine if this id shadows any existing properties for this proxy.
///
/// # Safety
/// `cx` must point to a valid, non-null JSContext.
pub unsafe extern "C" fn shadow_check_callback(
cx: *mut JSContext,
object: RawHandleObject,
id: RawHandleId,
) -> DOMProxyShadowsResult {
// TODO: support OverrideBuiltins when #12978 is fixed.
rooted!(in(cx) let mut expando = ptr::null_mut::<JSObject>());
get_expando_object(object, expando.handle_mut());
if !expando.get().is_null() {
let mut has_own = false;
let raw_id = Handle::from_raw(id);
if !JS_AlreadyHasOwnPropertyById(cx, expando.handle(), raw_id, &mut has_own) {
return DOMProxyShadowsResult::ShadowCheckFailed;
}
if has_own {
return DOMProxyShadowsResult::ShadowsViaDirectExpando;
}
}
// Our expando, if any, didn't shadow, so we're not shadowing at all.
DOMProxyShadowsResult::DoesntShadow
}
/// Initialize the infrastructure for DOM proxy objects.
pub fn init() {
unsafe {
SetDOMProxyInformation(
GetProxyHandlerFamily(),
Some(shadow_check_callback),
ptr::null(),
);
}
}
/// Defines an expando on the given `proxy`.
///
/// # Safety
/// `cx` must point to a valid, non-null JSContext.
/// `result` must point to a valid, non-null ObjectOpResult.
pub unsafe extern "C" fn define_property(
cx: *mut JSContext,
proxy: RawHandleObject,
id: RawHandleId,
desc: RawHandle<PropertyDescriptor>,
result: *mut ObjectOpResult,
) -> bool {
rooted!(in(cx) let mut expando = ptr::null_mut::<JSObject>());
ensure_expando_object(cx, proxy, expando.handle_mut());
JS_DefinePropertyById(cx, expando.handle().into(), id, desc, result)
}
/// Deletes an expando off the given `proxy`.
///
/// # Safety
/// `cx` must point to a valid, non-null JSContext.
/// `bp` must point to a valid, non-null ObjectOpResult.
pub unsafe extern "C" fn delete(
cx: *mut JSContext,
proxy: RawHandleObject,
id: RawHandleId,
bp: *mut ObjectOpResult,
) -> bool {
rooted!(in(cx) let mut expando = ptr::null_mut::<JSObject>());
get_expando_object(proxy, expando.handle_mut());
if expando.is_null() {
(*bp).code_ = 0 /* OkCode */;
return true;
}
delete_property_by_id(cx, expando.handle(), Handle::from_raw(id), bp)
}
/// Controls whether the Extensible bit can be changed
///
/// # Safety
/// `result` must point to a valid, non-null ObjectOpResult.
pub unsafe extern "C" fn prevent_extensions(
_cx: *mut JSContext,
_proxy: RawHandleObject,
result: *mut ObjectOpResult,
) -> bool {
(*result).code_ = JSErrNum::JSMSG_CANT_PREVENT_EXTENSIONS as ::libc::uintptr_t;
true
}
/// Reports whether the object is Extensible
///
/// # Safety
/// `succeeded` must point to a valid, non-null bool.
pub unsafe extern "C" fn is_extensible(
_cx: *mut JSContext,
_proxy: RawHandleObject,
succeeded: *mut bool,
) -> bool {
*succeeded = true;
true
}
/// If `proxy` (underneath any functionally-transparent wrapper proxies) has as
/// its `[[GetPrototypeOf]]` trap the ordinary `[[GetPrototypeOf]]` behavior
/// defined for ordinary objects, set `*is_ordinary` to true and store `obj`'s
/// prototype in `proto`. Otherwise set `*isOrdinary` to false. In case of
/// error, both outparams have unspecified value.
///
/// This implementation always handles the case of the ordinary
/// `[[GetPrototypeOf]]` behavior. An alternative implementation will be
/// necessary for maybe-cross-origin objects.
///
/// # Safety
/// `is_ordinary` must point to a valid, non-null bool.
pub unsafe extern "C" fn get_prototype_if_ordinary(
_: *mut JSContext,
proxy: RawHandleObject,
is_ordinary: *mut bool,
proto: RawMutableHandleObject,
) -> bool {
*is_ordinary = true;
proto.set(GetStaticPrototype(proxy.get()));
true
}
/// Get the expando object, or null if there is none.
pub fn get_expando_object(obj: RawHandleObject, mut expando: MutableHandleObject) {
unsafe {
assert!(is_dom_proxy(obj.get()));
let val = &mut UndefinedValue();
GetProxyPrivate(obj.get(), val);
expando.set(if val.is_undefined() {
ptr::null_mut()
} else {
val.to_object()
});
}
}
/// Get the expando object, or create it if it doesn't exist yet.
/// Fails on JSAPI failure.
///
/// # Safety
/// `cx` must point to a valid, non-null JSContext.
pub unsafe fn ensure_expando_object(
cx: *mut JSContext,
obj: RawHandleObject,
mut expando: MutableHandleObject,
) {
assert!(is_dom_proxy(obj.get()));
get_expando_object(obj, expando.reborrow());
if expando.is_null() {
expando.set(JS_NewObjectWithGivenProto(
cx,
ptr::null_mut(),
HandleObject::null(),
));
assert!(!expando.is_null());
SetProxyPrivate(obj.get(), &ObjectValue(expando.get()));
}
}
/// Set the property descriptor's object to `obj` and set it to enumerable,
/// and writable if `readonly` is true.
pub fn set_property_descriptor(
desc: MutableHandle<PropertyDescriptor>,
value: HandleValue,
attrs: u32,
is_none: &mut bool,
) {
unsafe {
SetDataPropertyDescriptor(desc, value, attrs);
}
*is_none = false;
}
pub fn id_to_source(cx: SafeJSContext, id: RawHandleId) -> Option<DOMString> {
unsafe {
rooted!(in(*cx) let mut value = UndefinedValue());
rooted!(in(*cx) let mut jsstr = ptr::null_mut::<jsapi::JSString>());
jsapi::JS_IdToValue(*cx, id.get(), value.handle_mut().into())
.then(|| {
jsstr.set(jsapi::JS_ValueToSource(*cx, value.handle().into()));
jsstr.get()
})
.and_then(ptr::NonNull::new)
.map(|jsstr| jsstring_to_str(*cx, jsstr))
}
}
/// Property and method specs that correspond to the elements of
/// [`CrossOriginProperties(O)`].
///
/// [`CrossOriginProperties(O)`]: https://html.spec.whatwg.org/multipage/#crossoriginproperties-(-o-)
pub struct CrossOriginProperties {
pub attributes: &'static [JSPropertySpec],
pub methods: &'static [JSFunctionSpec],
}
impl CrossOriginProperties {
/// Enumerate the property keys defined by `self`.
fn keys(&self) -> impl Iterator<Item = *const c_char> + '_ {
// Safety: All cross-origin property keys are strings, not symbols
self.attributes
.iter()
.map(|spec| unsafe { spec.name.string_ })
.chain(self.methods.iter().map(|spec| unsafe { spec.name.string_ }))
.filter(|ptr| !ptr.is_null())
}
}
/// Implementation of [`CrossOriginOwnPropertyKeys`].
///
/// [`CrossOriginOwnPropertyKeys`]: https://html.spec.whatwg.org/multipage/#crossoriginownpropertykeys-(-o-)
pub fn cross_origin_own_property_keys(
cx: SafeJSContext,
_proxy: RawHandleObject,
cross_origin_properties: &'static CrossOriginProperties,
props: RawMutableHandleIdVector,
) -> bool {
// > 2. For each `e` of `! CrossOriginProperties(O)`, append
// > `e.[[Property]]` to `keys`.
for key in cross_origin_properties.keys() {
unsafe {
rooted!(in(*cx) let rooted = JS_AtomizeAndPinString(*cx, key));
rooted!(in(*cx) let mut rooted_jsid: jsid);
RUST_INTERNED_STRING_TO_JSID(*cx, rooted.handle().get(), rooted_jsid.handle_mut());
AppendToIdVector(props, rooted_jsid.handle());
}
}
// > 3. Return the concatenation of `keys` and `« "then", @@toStringTag,
// > @@hasInstance, @@isConcatSpreadable »`.
append_cross_origin_allowlisted_prop_keys(cx, props);
true
}
/// # Safety
/// `is_ordinary` must point to a valid, non-null bool.
pub unsafe extern "C" fn maybe_cross_origin_get_prototype_if_ordinary_rawcx(
_: *mut JSContext,
_proxy: RawHandleObject,
is_ordinary: *mut bool,
_proto: RawMutableHandleObject,
) -> bool {
// We have a custom `[[GetPrototypeOf]]`, so return `false`
*is_ordinary = false;
true
}
/// Implementation of `[[SetPrototypeOf]]` for [`Location`] and [`WindowProxy`].
///
/// [`Location`]: https://html.spec.whatwg.org/multipage/#location-setprototypeof
/// [`WindowProxy`]: https://html.spec.whatwg.org/multipage/#windowproxy-setprototypeof
///
/// # Safety
/// `result` must point to a valid, non-null ObjectOpResult.
pub unsafe extern "C" fn maybe_cross_origin_set_prototype_rawcx(
cx: *mut JSContext,
proxy: RawHandleObject,
proto: RawHandleObject,
result: *mut ObjectOpResult,
) -> bool {
// > 1. Return `! SetImmutablePrototype(this, V)`.
//
// <https://tc39.es/ecma262/#sec-set-immutable-prototype>:
//
// > 1. Assert: Either `Type(V)` is Object or `Type(V)` is Null.
//
// > 2. Let current be `? O.[[GetPrototypeOf]]()`.
rooted!(in(cx) let mut current = ptr::null_mut::<JSObject>());
if !jsapi::GetObjectProto(cx, proxy, current.handle_mut().into()) {
return false;
}
// > 3. If `SameValue(V, current)` is true, return true.
if proto.get() == current.get() {
(*result).code_ = 0 /* OkCode */;
return true;
}
// > 4. Return false.
(*result).code_ = JSErrNum::JSMSG_CANT_SET_PROTO as usize;
true
}
pub fn get_getter_object(d: &PropertyDescriptor, out: RawMutableHandleObject) {
if d.hasGetter_() {
out.set(d.getter_);
}
}
pub fn get_setter_object(d: &PropertyDescriptor, out: RawMutableHandleObject) {
if d.hasSetter_() {
out.set(d.setter_);
}
}
/// <https://tc39.es/ecma262/#sec-isaccessordescriptor>
pub fn is_accessor_descriptor(d: &PropertyDescriptor) -> bool {
d.hasSetter_() || d.hasGetter_()
}
/// <https://tc39.es/ecma262/#sec-isdatadescriptor>
pub fn is_data_descriptor(d: &PropertyDescriptor) -> bool {
d.hasWritable_() || d.hasValue_()
}
/// Evaluate `CrossOriginGetOwnPropertyHelper(proxy, id) != null`.
/// SpiderMonkey-specific.
///
/// `cx` and `proxy` are expected to be different-Realm here. `proxy` is a proxy
/// for a maybe-cross-origin object.
///
/// # Safety
/// `bp` must point to a valid, non-null bool.
pub unsafe fn cross_origin_has_own(
cx: SafeJSContext,
_proxy: RawHandleObject,
cross_origin_properties: &'static CrossOriginProperties,
id: RawHandleId,
bp: *mut bool,
) -> bool {
// TODO: Once we have the slot for the holder, it'd be more efficient to
// use `ensure_cross_origin_property_holder`. We'll need `_proxy` to
// do that.
*bp = jsid_to_string(*cx, Handle::from_raw(id)).is_some_and(|key| {
cross_origin_properties.keys().any(|defined_key| {
let defined_key = CStr::from_ptr(defined_key);
defined_key.to_bytes() == key.as_bytes()
})
});
true
}
/// Implementation of [`CrossOriginGetOwnPropertyHelper`].
///
/// `cx` and `proxy` are expected to be different-Realm here. `proxy` is a proxy
/// for a maybe-cross-origin object.
///
/// [`CrossOriginGetOwnPropertyHelper`]: https://html.spec.whatwg.org/multipage/#crossorigingetownpropertyhelper-(-o,-p-)
pub fn cross_origin_get_own_property_helper(
cx: SafeJSContext,
proxy: RawHandleObject,
cross_origin_properties: &'static CrossOriginProperties,
id: RawHandleId,
desc: RawMutableHandle<PropertyDescriptor>,
is_none: &mut bool,
) -> bool {
rooted!(in(*cx) let mut holder = ptr::null_mut::<JSObject>());
ensure_cross_origin_property_holder(
cx,
proxy,
cross_origin_properties,
holder.handle_mut().into(),
);
unsafe { JS_GetOwnPropertyDescriptorById(*cx, holder.handle().into(), id, desc, is_none) }
}
const ALLOWLISTED_SYMBOL_CODES: &[SymbolCode] = &[
SymbolCode::toStringTag,
SymbolCode::hasInstance,
SymbolCode::isConcatSpreadable,
];
pub fn is_cross_origin_allowlisted_prop(cx: SafeJSContext, id: RawHandleId) -> bool {
unsafe {
if jsid_to_string(*cx, Handle::from_raw(id)).is_some_and(|st| st == "then") {
return true;
}
rooted!(in(*cx) let mut allowed_id: jsid);
ALLOWLISTED_SYMBOL_CODES.iter().any(|&allowed_code| {
allowed_id.set(SymbolId(GetWellKnownSymbol(*cx, allowed_code)));
// `jsid`s containing `JS::Symbol *` can be compared by
// referential equality
allowed_id.get().asBits_ == id.asBits_
})
}
}
/// Append `« "then", @@toStringTag, @@hasInstance, @@isConcatSpreadable »` to
/// `props`. This is used to implement [`CrossOriginOwnPropertyKeys`].
///
/// [`CrossOriginOwnPropertyKeys`]: https://html.spec.whatwg.org/multipage/#crossoriginownpropertykeys-(-o-)
fn append_cross_origin_allowlisted_prop_keys(cx: SafeJSContext, props: RawMutableHandleIdVector) {
unsafe {
rooted!(in(*cx) let mut id: jsid);
let jsstring = JS_AtomizeAndPinString(*cx, c"then".as_ptr());
rooted!(in(*cx) let rooted = jsstring);
RUST_INTERNED_STRING_TO_JSID(*cx, rooted.handle().get(), id.handle_mut());
AppendToIdVector(props, id.handle());
for &allowed_code in ALLOWLISTED_SYMBOL_CODES.iter() {
id.set(SymbolId(GetWellKnownSymbol(*cx, allowed_code)));
AppendToIdVector(props, id.handle());
}
}
}
/// Get the holder for cross-origin properties for the current global of the
/// `JSContext`, creating one and storing it in a slot of the proxy object if it
/// doesn't exist yet.
///
/// This essentially creates a cache of [`CrossOriginGetOwnPropertyHelper`]'s
/// results for all property keys.
///
/// `cx` and `proxy` are expected to be different-Realm here. `proxy` is a proxy
/// for a maybe-cross-origin object. The `out_holder` return value will always
/// be in the Realm of `cx`.
///
/// [`CrossOriginGetOwnPropertyHelper`]: https://html.spec.whatwg.org/multipage/#crossorigingetownpropertyhelper-(-o,-p-)
fn ensure_cross_origin_property_holder(
cx: SafeJSContext,
_proxy: RawHandleObject,
cross_origin_properties: &'static CrossOriginProperties,
out_holder: RawMutableHandleObject,
) -> bool {
// TODO: We don't have the slot to store the holder yet. For now,
// the holder is constructed every time this function is called,
// which is not only inefficient but also deviates from the
// specification in a subtle yet observable way.
// Create a holder for the current Realm
unsafe {
out_holder.set(jsapi::JS_NewObjectWithGivenProto(
*cx,
ptr::null_mut(),
RawHandleObject::null(),
));
if out_holder.get().is_null() ||
!jsapi::JS_DefineProperties(
*cx,
out_holder.handle(),
cross_origin_properties.attributes.as_ptr(),
) ||
!jsapi::JS_DefineFunctions(
*cx,
out_holder.handle(),
cross_origin_properties.methods.as_ptr(),
)
{
return false;
}
}
// TODO: Store the holder in the slot that we don't have yet.
true
}

20
components/script_bindings/root.rs
View file

@ -440,3 +440,23 @@ pub unsafe fn trace_roots(tracer: *mut JSTracer) {
pub fn assert_in_script() {
debug_assert!(thread_state::get().is_script());
}
/// Get a slice of references to DOM objects.
pub trait DomSlice<T>
where
T: JSTraceable + DomObject,
{
/// Returns the slice of `T` references.
fn r(&self) -> &[&T];
}
impl<T> DomSlice<T> for [Dom<T>]
where
T: JSTraceable + DomObject,
{
#[inline]
fn r(&self) -> &[&T] {
let _ = mem::transmute::<Dom<T>, &T>;
unsafe { &*(self as *const [Dom<T>] as *const [&T]) }
}
}

46
components/script_bindings/utils.rs
View file

@ -3,7 +3,7 @@
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::ffi::CString;
use std::os::raw::c_void;
use std::os::raw::{c_char, c_void};
use std::ptr::{self, NonNull};
use js::conversions::ToJSValConvertible;
@ -13,9 +13,9 @@ use js::glue::{
};
use js::jsapi::{
AtomToLinearString, CallArgs, ExceptionStackBehavior, GetLinearStringCharAt,
GetLinearStringLength, GetNonCCWObjectGlobal, HandleObject as RawHandleObject,
GetLinearStringLength, GetNonCCWObjectGlobal, HandleObject as RawHandleObject, Heap,
JS_ClearPendingException, JS_IsExceptionPending, JSAtom, JSContext, JSJitInfo, JSObject,
MutableHandleValue as RawMutableHandleValue, ObjectOpResult, StringIsArrayIndex,
JSTracer, MutableHandleValue as RawMutableHandleValue, ObjectOpResult, StringIsArrayIndex,
};
use js::jsval::{JSVal, UndefinedValue};
use js::rust::wrappers::{
@ -36,6 +36,7 @@ use crate::conversions::{PrototypeCheck, jsstring_to_str, private_from_proto_che
use crate::error::throw_invalid_this;
use crate::script_runtime::{CanGc, JSContext as SafeJSContext};
use crate::str::DOMString;
use crate::trace::trace_object;
/// The struct that holds inheritance information for DOM object reflectors.
#[derive(Clone, Copy)]
@ -526,3 +527,42 @@ pub unsafe fn exception_to_promise(
false
}
}
/// Trace the resources held by reserved slots of a global object
///
/// # Safety
/// `tracer` must point to a valid, non-null JSTracer.
/// `obj` must point to a valid, non-null JSObject.
pub unsafe fn trace_global(tracer: *mut JSTracer, obj: *mut JSObject) {
let array = get_proto_or_iface_array(obj);
for proto in (*array).iter() {
if !proto.is_null() {
trace_object(
tracer,
"prototype",
&*(proto as *const *mut JSObject as *const Heap<*mut JSObject>),
);
}
}
}
// Generic method for returning libc::c_void from caller
pub trait AsVoidPtr {
fn as_void_ptr(&self) -> *const libc::c_void;
}
impl<T> AsVoidPtr for T {
fn as_void_ptr(&self) -> *const libc::c_void {
self as *const T as *const libc::c_void
}
}
// Generic method for returning c_char from caller
pub trait AsCCharPtrPtr {
fn as_c_char_ptr(&self) -> *const c_char;
}
impl AsCCharPtrPtr for [u8] {
fn as_c_char_ptr(&self) -> *const c_char {
self as *const [u8] as *const c_char
}
}