Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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
#ifndef vm_Shape_inl_h
#define vm_Shape_inl_h
#include "vm/Shape.h"
#include "vm/JSObject.h"
#include "vm/PropertyResult.h"
#include "vm/TypedArrayObject.h"
#include "gc/GCContext-inl.h"
#include "gc/Marking-inl.h"
#include "vm/PropMap-inl.h"
namespace js {
template <class ObjectSubclass>
/* static */ inline bool SharedShape::ensureInitialCustomShape(
JSContext* cx, Handle<ObjectSubclass*> obj) {
static_assert(std::is_base_of_v<JSObject, ObjectSubclass>,
"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;
}
// Ensure the initial shape isn't collected under assignInitialShape, to
// simplify insertInitialShape.
Rooted<Shape*> emptyShape(cx, obj->shape());
// If no initial shape was assigned, do so.
Rooted<SharedShape*> shape(cx, ObjectSubclass::assignInitialShape(cx, obj));
if (!shape) {
return false;
}
MOZ_ASSERT(!obj->empty());
// Cache the initial shape, so that future instances will begin life with that
// shape.
SharedShape::insertInitialShape(cx, shape);
return true;
}
MOZ_ALWAYS_INLINE PropMap* NativeShape::lookup(JSContext* cx, PropertyKey key,
uint32_t* index) {
uint32_t len = propMapLength();
return len > 0 ? propMap_->lookup(cx, len, key, index) : nullptr;
}
MOZ_ALWAYS_INLINE PropMap* NativeShape::lookupPure(PropertyKey key,
uint32_t* index) {
uint32_t len = propMapLength();
return len > 0 ? propMap_->lookupPure(len, key, index) : nullptr;
}
inline void Shape::purgeCache(JS::GCContext* gcx) {
if (cache_.isShapeSetForAdd()) {
gcx->delete_(this, cache_.toShapeSetForAdd(), MemoryUse::ShapeSetForAdd);
}
cache_.setNone();
}
inline void Shape::finalize(JS::GCContext* gcx) {
if (!cache_.isNone()) {
purgeCache(gcx);
}
if (isWasmGC()) {
asWasmGC().finalize(gcx);
}
}
inline void WasmGCShape::init() { recGroup_->AddRef(); }
inline void WasmGCShape::finalize(JS::GCContext* gcx) { recGroup_->Release(); }
inline SharedPropMap* SharedShape::propMapMaybeForwarded() const {
MOZ_ASSERT(isShared());
PropMap* propMap = propMap_;
return propMap ? MaybeForwarded(propMap)->asShared() : nullptr;
}
static inline JS::PropertyAttributes GetPropertyAttributes(
JSObject* obj, PropertyResult prop) {
MOZ_ASSERT(obj->is<NativeObject>());
if (prop.isDenseElement()) {
return obj->as<NativeObject>().getElementsHeader()->elementAttributes();
}
if (prop.isTypedArrayElement()) {
if (obj->is<ImmutableTypedArrayObject>()) {
return {JS::PropertyAttribute::Enumerable};
}
return {JS::PropertyAttribute::Configurable,
JS::PropertyAttribute::Enumerable, JS::PropertyAttribute::Writable};
}
return prop.propertyInfo().propAttributes();
}
} /* namespace js */
#endif /* vm_Shape_inl_h */