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Add a permanent root to WebIDL callbacks, ensuring they are always safe to store.

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This commit is contained in:
Josh Matthews 2017-01-12 18:05:54 -05:00
parent 550df86ac8
commit 3f35c3eee2
4 changed files with 75 additions and 28 deletions
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17
components/script/dom/bindings/codegen/CodegenRust.py
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@ -776,7 +776,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
if descriptor.interface.isCallback():
name = descriptor.nativeType
declType = CGWrapper(CGGeneric(name), pre="Rc<", post=">")
template = "%s::new(${val}.get().to_object())" % name
template = "%s::new(cx, ${val}.get().to_object())" % name
if type.nullable():
declType = CGWrapper(declType, pre="Option<", post=">")
template = wrapObjectTemplate("Some(%s)" % template, "None",
@ -2195,7 +2195,7 @@ class CGGeneric(CGThing):
class CGCallbackTempRoot(CGGeneric):
def __init__(self, name):
CGGeneric.__init__(self, "%s::new(${val}.get().to_object())" % name)
CGGeneric.__init__(self, "%s::new(cx, ${val}.get().to_object())" % name)
def getAllTypes(descriptors, dictionaries, callbacks, typedefs):
@ -4444,10 +4444,11 @@ class ClassConstructor(ClassItem):
"});\n"
"// Note: callback cannot be moved after calling init.\n"
"match Rc::get_mut(&mut ret) {\n"
" Some(ref mut callback) => callback.parent.init(%s),\n"
" Some(ref mut callback) => unsafe { callback.parent.init(%s, %s) },\n"
" None => unreachable!(),\n"
"};\n"
"ret") % (cgClass.name, '\n'.join(initializers), self.args[0].name))
"ret") % (cgClass.name, '\n'.join(initializers),
self.args[0].name, self.args[1].name))
def declare(self, cgClass):
args = ', '.join([a.declare() for a in self.args])
@ -6236,11 +6237,11 @@ class CGCallback(CGClass):
bases=[ClassBase(baseName)],
constructors=self.getConstructors(),
methods=realMethods + getters + setters,
decorators="#[derive(JSTraceable, PartialEq)]")
decorators="#[derive(JSTraceable, PartialEq)]\n#[allow_unrooted_interior]")
def getConstructors(self):
return [ClassConstructor(
[Argument("*mut JSObject", "aCallback")],
[Argument("*mut JSContext", "aCx"), Argument("*mut JSObject", "aCallback")],
bodyInHeader=True,
visibility="pub",
explicit=False,
@ -6336,8 +6337,8 @@ class CGCallbackFunctionImpl(CGGeneric):
def __init__(self, callback):
impl = string.Template("""\
impl CallbackContainer for ${type} {
fn new(callback: *mut JSObject) -> Rc<${type}> {
${type}::new(callback)
unsafe fn new(cx: *mut JSContext, callback: *mut JSObject) -> Rc<${type}> {
${type}::new(cx, callback)
}
fn callback_holder(&self) -> &CallbackObject {