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Auto merge of #19644 - Xanewok:root-seq-any, r=jdm

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Root sequence<any> params using CustomAutoRooter

<!-- Please describe your changes on the following line: -->

Attempt at https://github.com/servo/servo/issues/16678. At the moment this pulls an external [remove-handle-conv](https://github.com/Xanewok/rust-mozjs/tree/remove-handle-conv) branch for rust-mozjs (removing `FromJSValConvertible` implementation for `HandleValue` and adding one for `*mut JSObject`)

In short, this roots the `sequence<any>` and `sequence<object>` function arguments using `CustomAutoRooter` (introduced in https://github.com/servo/rust-mozjs/pull/382).

As per https://github.com/servo/servo/issues/16678#issuecomment-302224110 the underlying vector contains raw gc thing pointers instead of handles. To do that, this introduces new possible `isMember = "AutoRoot"` value in CodegenRust.py.
The rooted argument is passed to a function wrapped in a `CustomAutoRooterGuard` [RAII root guard](ed5e37a288/src/rust.rs (L586-L588)) (e.g. as `CustomAutoRooterGuard<Vec<JSVal>>`)

I felt quite out of my depth when trying to adapt CodegenRust.py code, so I'd appreciate any help with how can be done better/in a more clean manner.
Also the name `CustomAutoRooterGuard` is quite lengthy, so I'm also open to changing it (`AutoRoot`? `AutoRootGuard`?)

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [x] These changes fix #16678  (github issue number if applicable).

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- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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This commit is contained in:
bors-servo 2018-01-05 14:02:53 -06:00 • committed by GitHub
commit 989d2fd532
8 changed files with 91 additions and 10 deletions
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43
components/script/dom/bindings/codegen/CodegenRust.py
View file

@ -562,6 +562,7 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
isDefinitelyObject=False,
isMember=False,
isArgument=False,
isAutoRooted=False,
invalidEnumValueFatal=True,
defaultValue=None,
treatNullAs="Default",
@ -702,7 +703,8 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
if type.isSequence() or type.isRecord():
innerInfo = getJSToNativeConversionInfo(innerContainerType(type),
descriptorProvider,
isMember=isMember)
isMember=isMember,
isAutoRooted=isAutoRooted)
declType = wrapInNativeContainerType(type, innerInfo.declType)
config = getConversionConfigForType(type, isEnforceRange, isClamp, treatNullAs)
@ -1038,10 +1040,14 @@ def getJSToNativeConversionInfo(type, descriptorProvider, failureCode=None,
assert not isEnforceRange and not isClamp
assert isMember != "Union"
if isMember == "Dictionary":
if isMember == "Dictionary" or isAutoRooted:
# TODO: Need to properly root dictionaries
# https://github.com/servo/servo/issues/6381
declType = CGGeneric("Heap<JSVal>")
if isMember == "Dictionary":
declType = CGGeneric("Heap<JSVal>")
# AutoRooter can trace properly inner raw GC thing pointers
else:
declType = CGGeneric("JSVal")
if defaultValue is None:
default = None
@ -1238,6 +1244,7 @@ class CGArgumentConverter(CGThing):
isEnforceRange=argument.enforceRange,
isClamp=argument.clamp,
isMember="Variadic" if argument.variadic else False,
isAutoRooted=type_needs_auto_root(argument.type),
allowTreatNonObjectAsNull=argument.allowTreatNonCallableAsNull())
template = info.template
default = info.default
@ -1260,8 +1267,15 @@ class CGArgumentConverter(CGThing):
else:
assert not default
arg = "arg%d" % index
self.converter = instantiateJSToNativeConversionTemplate(
template, replacementVariables, declType, "arg%d" % index)
template, replacementVariables, declType, arg)
# The auto rooting is done only after the conversion is performed
if type_needs_auto_root(argument.type):
self.converter.append(CGGeneric("auto_root!(in(cx) let %s = %s);" % (arg, arg)))
else:
assert argument.optional
variadicConversion = {
@ -5698,6 +5712,7 @@ def generate_imports(config, cgthings, descriptors, callbacks=None, dictionaries
'js::panic::maybe_resume_unwind',
'js::panic::wrap_panic',
'js::rust::GCMethods',
'js::rust::CustomAutoRooterGuard',
'js::rust::define_methods',
'js::rust::define_properties',
'js::rust::get_object_class',
@ -6421,9 +6436,24 @@ def type_needs_tracing(t):
assert False, (t, type(t))
def type_needs_auto_root(t):
"""
Certain IDL types, such as `sequence<any>` or `sequence<object>` need to be
traced and wrapped via (Custom)AutoRooter
"""
assert isinstance(t, IDLObject), (t, type(t))
if t.isType():
if t.isSequence() and (t.inner.isAny() or t.inner.isObject()):
return True
return False
def argument_type(descriptorProvider, ty, optional=False, defaultValue=None, variadic=False):
info = getJSToNativeConversionInfo(
ty, descriptorProvider, isArgument=True)
ty, descriptorProvider, isArgument=True,
isAutoRooted=type_needs_auto_root(ty))
declType = info.declType
if variadic:
@ -6437,6 +6467,9 @@ def argument_type(descriptorProvider, ty, optional=False, defaultValue=None, var
if ty.isDictionary() and not type_needs_tracing(ty):
declType = CGWrapper(declType, pre="&")
if type_needs_auto_root(ty):
declType = CGTemplatedType("CustomAutoRooterGuard", declType)
return declType.define()

9
components/script/dom/testbinding.rs
View file

@ -38,6 +38,7 @@ use dom_struct::dom_struct;
use js::jsapi::{HandleObject, HandleValue, Heap, JSContext, JSObject};
use js::jsapi::{JS_NewPlainObject, JS_NewUint8ClampedArray};
use js::jsval::{JSVal, NullValue};
use js::rust::CustomAutoRooterGuard;
use script_traits::MsDuration;
use servo_config::prefs::PREFS;
use std::borrow::ToOwned;
@ -449,6 +450,14 @@ impl TestBindingMethods for TestBinding {
fn PassCallbackFunction(&self, _: Rc<Function>) {}
fn PassCallbackInterface(&self, _: Rc<EventListener>) {}
fn PassSequence(&self, _: Vec<i32>) {}
#[allow(unsafe_code)]
unsafe fn PassAnySequence(&self, _: *mut JSContext, _: CustomAutoRooterGuard<Vec<JSVal>>) {}
#[allow(unsafe_code)]
unsafe fn AnySequencePassthrough(&self, _: *mut JSContext, seq: CustomAutoRooterGuard<Vec<JSVal>>) -> Vec<JSVal> {
(*seq).clone()
}
#[allow(unsafe_code)]
unsafe fn PassObjectSequence(&self, _: *mut JSContext, _: CustomAutoRooterGuard<Vec<*mut JSObject>>) {}
fn PassStringSequence(&self, _: Vec<DOMString>) {}
fn PassInterfaceSequence(&self, _: Vec<DomRoot<Blob>>) {}

3
components/script/dom/webidls/TestBinding.webidl
View file

@ -263,6 +263,9 @@ interface TestBinding {
void passCallbackFunction(Function fun);
void passCallbackInterface(EventListener listener);
void passSequence(sequence<long> seq);
void passAnySequence(sequence<any> seq);
sequence<any> anySequencePassthrough(sequence<any> seq);
void passObjectSequence(sequence<object> seq);
void passStringSequence(sequence<DOMString> seq);
void passInterfaceSequence(sequence<Blob> seq);