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Auto merge of #26154 - Manishearth:platform-object-overload, r=jdm

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Do not filter out platform objects when doing dictionary conversions in overload resolution

https://heycam.github.io/webidl/#es-overloads

In step 12, the platform object check is for substep 4, but importantly it only matters if `V` implements the matching interface. If not, it should be able to fall back to substep 10 and attempt conversion to a dictionary.
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bors-servo 2020-04-09 17:39:10 -04:00 • committed by GitHub
commit 455a99ca8d
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7 changed files with 51 additions and 3 deletions
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4
components/script/dom/bindings/codegen/CodegenRust.py
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@ -429,8 +429,8 @@ class CGMethodCall(CGThing):
# Check for vanilla JS objects
# XXXbz Do we need to worry about security wrappers?
pickFirstSignature("%s.get().is_object() && !is_platform_object(%s.get().to_object(), *cx)" %
(distinguishingArg, distinguishingArg),
pickFirstSignature("%s.get().is_object()" %
distinguishingArg,
lambda s: (s[1][distinguishingIndex].type.isCallback() or
s[1][distinguishingIndex].type.isCallbackInterface() or
s[1][distinguishingIndex].type.isDictionary() or

11
components/script/dom/testbinding.rs
View file

@ -12,7 +12,7 @@ use crate::dom::bindings::codegen::Bindings::TestBindingBinding::{
TestBindingMethods, TestDictionary,
};
use crate::dom::bindings::codegen::Bindings::TestBindingBinding::{
TestDictionaryDefaults, TestEnum,
TestDictionaryDefaults, TestEnum, TestURLLike,
};
use crate::dom::bindings::codegen::UnionTypes;
use crate::dom::bindings::codegen::UnionTypes::{
@ -45,6 +45,7 @@ use crate::dom::bindings::trace::RootedTraceableBox;
use crate::dom::bindings::weakref::MutableWeakRef;
use crate::dom::blob::Blob;
use crate::dom::globalscope::GlobalScope;
use crate::dom::node::Node;
use crate::dom::promise::Promise;
use crate::dom::promisenativehandler::{Callback, PromiseNativeHandler};
use crate::dom::url::URL;
@ -679,6 +680,14 @@ impl TestBindingMethods for TestBinding {
fn PassOverloaded(&self, _: CustomAutoRooterGuard<typedarray::ArrayBuffer>) {}
fn PassOverloaded_(&self, _: DOMString) {}
fn PassOverloadedDict(&self, _: &Node) -> DOMString {
"node".into()
}
fn PassOverloadedDict_(&self, u: &TestURLLike) -> DOMString {
u.href.clone()
}
fn PassNullableBoolean(&self, _: Option<bool>) {}
fn PassNullableByte(&self, _: Option<i8>) {}
fn PassNullableOctet(&self, _: Option<u8>) {}

8
components/script/dom/webidls/TestBinding.webidl
View file

@ -86,6 +86,10 @@ dictionary TestDictionaryDefaults {
object? nullableObjectValue = null;
};
dictionary TestURLLike {
required DOMString href;
};
[Pref="dom.testbinding.enabled",
Exposed=(Window,Worker)
]
@ -279,6 +283,10 @@ interface TestBinding {
void passOverloaded(ArrayBuffer arg);
void passOverloaded(DOMString arg);
// https://github.com/servo/servo/pull/26154
DOMString passOverloadedDict(Node arg);
DOMString passOverloadedDict(TestURLLike arg);
void passNullableBoolean(boolean? arg);
void passNullableByte(byte? arg);
void passNullableOctet(octet? arg);

3
tests/wpt/mozilla/meta-layout-2020/mozilla/overload_dict.html.ini Normal file
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@ -0,0 +1,3 @@
[overload_dict.html]
type: testharness
prefs: [dom.testbinding.enabled:true]

7
tests/wpt/mozilla/meta/MANIFEST.json
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@ -14088,6 +14088,13 @@
{}
]
],
"overload_dict.html": [
"cd42fd97331753fc0580a47a39814cff57911638",
[
null,
{}
]
],
"paint_timing.html": [
"0c1798ec565a77d20d9550b5cec352a0b286c415",
[

3
tests/wpt/mozilla/meta/mozilla/overload_dict.html.ini Normal file
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@ -0,0 +1,3 @@
[overload_dict.html]
type: testharness
prefs: [dom.testbinding.enabled:true]

18
tests/wpt/mozilla/tests/mozilla/overload_dict.html Normal file
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@ -0,0 +1,18 @@
<!doctype html>
<meta charset="utf-8">
<title>Test for overload with dictionary object</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
var t = new TestBinding();
assert_equals(t.passOverloadedDict({href: "a"}), "a");
assert_equals(t.passOverloadedDict(document.documentElement), "node");
// interface objects should be converted to the dictionary if
// they're incompatible with the interface
// See https://github.com/servo/servo/pull/26154
assert_equals(t.passOverloadedDict(new URL("https://example.org/foo")), "https://example.org/foo");
}, "Overload of dictionary and interface item works")
</script>