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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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 http://mozilla.org/MPL/2.0/. */
#ifndef vm_Shape_inl_h
#define vm_Shape_inl_h
#include "vm/Shape.h"
#include "mozilla/TypeTraits.h"
#include "jsobj.h"
#include "gc/Allocator.h"
#include "vm/Interpreter.h"
#include "vm/TypedArrayCommon.h"
#include "jsatominlines.h"
#include "jscntxtinlines.h"
namespace js {
inline
AutoKeepShapeTables::AutoKeepShapeTables(ExclusiveContext* cx)
: cx_(cx),
prev_(cx->zone()->keepShapeTables())
{
cx->zone()->setKeepShapeTables(true);
}
inline
AutoKeepShapeTables::~AutoKeepShapeTables()
{
cx_->zone()->setKeepShapeTables(prev_);
}
inline
StackBaseShape::StackBaseShape(ExclusiveContext* cx, const Class* clasp, uint32_t objectFlags)
: flags(objectFlags),
clasp(clasp)
{}
inline Shape*
Shape::search(ExclusiveContext* cx, jsid id)
{
return search(cx, this, id);
}
MOZ_ALWAYS_INLINE bool
Shape::maybeCreateTableForLookup(ExclusiveContext* cx)
{
if (hasTable())
return true;
if (!inDictionary() && numLinearSearches() < LINEAR_SEARCHES_MAX) {
incrementNumLinearSearches();
return true;
}
if (!isBigEnoughForAShapeTable())
return true;
return Shape::hashify(cx, this);
}
template<MaybeAdding Adding>
/* static */ inline bool
Shape::search(ExclusiveContext* cx, Shape* start, jsid id, const AutoKeepShapeTables& keep,
Shape** pshape, ShapeTable::Entry** pentry)
{
if (start->inDictionary()) {
ShapeTable* table = start->ensureTableForDictionary(cx, keep);
if (!table)
return false;
*pentry = &table->search<Adding>(id, keep);
*pshape = (*pentry)->shape();
return true;
}
*pentry = nullptr;
*pshape = Shape::search<Adding>(cx, start, id);
return true;
}
template<MaybeAdding Adding>
/* static */ inline Shape*
Shape::search(ExclusiveContext* cx, Shape* start, jsid id)
{
if (start->maybeCreateTableForLookup(cx)) {
JS::AutoCheckCannotGC nogc;
if (ShapeTable* table = start->maybeTable(nogc)) {
ShapeTable::Entry& entry = table->search<Adding>(id, nogc);
return entry.shape();
}
} else {
// Just do a linear search.
cx->recoverFromOutOfMemory();
}
return start->searchLinear(id);
}
inline Shape*
Shape::new_(ExclusiveContext* cx, Handle<StackShape> other, uint32_t nfixed)
{
Shape* shape = other.isAccessorShape()
? js::Allocate<AccessorShape>(cx)
: js::Allocate<Shape>(cx);
if (!shape) {
ReportOutOfMemory(cx);
return nullptr;
}
if (other.isAccessorShape())
new (shape) AccessorShape(other, nfixed);
else
new (shape) Shape(other, nfixed);
return shape;
}
inline void
Shape::updateBaseShapeAfterMovingGC()
{
BaseShape* base = base_.unbarrieredGet();
if (IsForwarded(base))
base_.unsafeSet(Forwarded(base));
}
template<class ObjectSubclass>
/* static */ inline bool
EmptyShape::ensureInitialCustomShape(ExclusiveContext* cx, Handle<ObjectSubclass*> obj)
{
static_assert(mozilla::IsBaseOf<JSObject, ObjectSubclass>::value,
"ObjectSubclass must be a subclass of JSObject");
// If the provided object has a non-empty shape, it was given the cached
// initial shape when created: nothing to do.
if (!obj->empty())
return true;
// If no initial shape was assigned, do so.
RootedShape shape(cx, ObjectSubclass::assignInitialShape(cx, obj));
if (!shape)
return false;
MOZ_ASSERT(!obj->empty());
// If the object is a standard prototype -- |RegExp.prototype|,
// |String.prototype|, |RangeError.prototype|, &c. -- GlobalObject.cpp's
// |CreateBlankProto| marked it as a delegate. These are the only objects
// of this class that won't use the standard prototype, and there's no
// reason to pollute the initial shape cache with entries for them.
if (obj->isDelegate())
return true;
// Cache the initial shape for non-prototype objects, however, so that
// future instances will begin life with that shape.
RootedObject proto(cx, obj->staticPrototype());
EmptyShape::insertInitialShape(cx, shape, proto);
return true;
}
inline
AutoRooterGetterSetter::Inner::Inner(ExclusiveContext* cx, uint8_t attrs,
GetterOp* pgetter_, SetterOp* psetter_)
: CustomAutoRooter(cx), attrs(attrs),
pgetter(pgetter_), psetter(psetter_)
{}
inline
AutoRooterGetterSetter::AutoRooterGetterSetter(ExclusiveContext* cx, uint8_t attrs,
GetterOp* pgetter, SetterOp* psetter
MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
{
if (attrs & (JSPROP_GETTER | JSPROP_SETTER))
inner.emplace(cx, attrs, pgetter, psetter);
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
inline
AutoRooterGetterSetter::AutoRooterGetterSetter(ExclusiveContext* cx, uint8_t attrs,
JSNative* pgetter, JSNative* psetter
MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
{
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
inner.emplace(cx, attrs, reinterpret_cast<GetterOp*>(pgetter),
reinterpret_cast<SetterOp*>(psetter));
}
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
static inline uint8_t
GetShapeAttributes(JSObject* obj, Shape* shape)
{
MOZ_ASSERT(obj->isNative());
if (IsImplicitDenseOrTypedArrayElement(shape)) {
if (obj->is<TypedArrayObject>())
return JSPROP_ENUMERATE | JSPROP_PERMANENT;
return obj->as<NativeObject>().getElementsHeader()->elementAttributes();
}
return shape->attributes();
}
} /* namespace js */
#endif /* vm_Shape_inl_h */
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