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/* -*- 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef vm_List_inl_h
#define vm_List_inl_h
#include "vm/List.h"
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include <stdint.h> // uint32_t
#include "js/RootingAPI.h" // JS::Handle, JS::Rooted
#include "js/Value.h" // JS::Value, JS::ObjectValue
#include "vm/JSContext.h" // JSContext
#include "vm/NativeObject.h" // js::NativeObject
#include "vm/Compartment-inl.h" // JS::Compartment::wrap
#include "vm/JSObject-inl.h" // js::NewObjectWithGivenProto
#include "vm/NativeObject-inl.h" // js::NativeObject::*
#include "vm/Realm-inl.h" // js::AutoRealm
inline /* static */ js::ListObject* js::ListObject::create(JSContext* cx) {
return NewObjectWithGivenProto<ListObject>(cx, nullptr);
}
inline bool js::ListObject::append(JSContext* cx, JS::Handle<JS::Value> value) {
uint32_t len = length();
if (!ensureElements(cx, len + 1)) {
return false;
}
ensureDenseInitializedLength(len, 1);
setDenseElement(len, value);
return true;
}
inline bool js::ListObject::appendValueAndSize(JSContext* cx,
JS::Handle<JS::Value> value,
double size) {
uint32_t len = length();
if (!ensureElements(cx, len + 2)) {
return false;
}
ensureDenseInitializedLength(len, 2);
setDenseElement(len, value);
setDenseElement(len + 1, JS::DoubleValue(size));
return true;
}
inline JS::Value js::ListObject::popFirst(JSContext* cx) {
uint32_t len = length();
MOZ_ASSERT(len > 0);
JS::Value entry = get(0);
if (!tryShiftDenseElements(1)) {
moveDenseElements(0, 1, len - 1);
setDenseInitializedLength(len - 1);
shrinkElements(cx, len - 1);
}
MOZ_ASSERT(length() == len - 1);
return entry;
}
inline void js::ListObject::popFirstPair(JSContext* cx) {
uint32_t len = length();
MOZ_ASSERT(len > 0);
MOZ_ASSERT((len % 2) == 0);
if (!tryShiftDenseElements(2)) {
moveDenseElements(0, 2, len - 2);
setDenseInitializedLength(len - 2);
shrinkElements(cx, len - 2);
}
MOZ_ASSERT(length() == len - 2);
}
template <class T>
inline T& js::ListObject::popFirstAs(JSContext* cx) {
return popFirst(cx).toObject().as<T>();
}
namespace js {
/**
* Stores an empty ListObject in the given fixed slot of |obj|.
*/
[[nodiscard]] inline bool StoreNewListInFixedSlot(JSContext* cx,
JS::Handle<NativeObject*> obj,
uint32_t slot) {
AutoRealm ar(cx, obj);
ListObject* list = ListObject::create(cx);
if (!list) {
return false;
}
obj->setFixedSlot(slot, JS::ObjectValue(*list));
return true;
}
/**
* Given an object |obj| whose fixed slot |slot| contains a ListObject, append
* |toAppend| to that list.
*/
[[nodiscard]] inline bool AppendToListInFixedSlot(
JSContext* cx, JS::Handle<NativeObject*> obj, uint32_t slot,
JS::Handle<JSObject*> toAppend) {
JS::Rooted<ListObject*> list(
cx, &obj->getFixedSlot(slot).toObject().as<ListObject>());
AutoRealm ar(cx, list);
JS::Rooted<JS::Value> val(cx, JS::ObjectValue(*toAppend));
if (!cx->compartment()->wrap(cx, &val)) {
return false;
}
return list->append(cx, val);
}
} // namespace js
#endif // vm_List_inl_h
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