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https://github.com/classilla/tenfourfox.git
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69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "vm/ReceiverGuard.h"
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#include "builtin/TypedObject.h"
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#include "vm/UnboxedObject.h"
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#include "jsobjinlines.h"
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using namespace js;
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ReceiverGuard::ReceiverGuard(JSObject* obj)
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: group(nullptr), shape(nullptr)
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{
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if (obj) {
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if (obj->is<UnboxedPlainObject>()) {
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group = obj->group();
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if (UnboxedExpandoObject* expando = obj->as<UnboxedPlainObject>().maybeExpando())
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shape = expando->lastProperty();
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} else if (obj->is<UnboxedArrayObject>() || obj->is<TypedObject>()) {
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group = obj->group();
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} else {
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shape = obj->maybeShape();
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}
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}
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}
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ReceiverGuard::ReceiverGuard(ObjectGroup* group, Shape* shape)
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: group(group), shape(shape)
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{
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if (group) {
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const Class* clasp = group->clasp();
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if (clasp == &UnboxedPlainObject::class_) {
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// Keep both group and shape.
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} else if (clasp == &UnboxedArrayObject::class_ || IsTypedObjectClass(clasp)) {
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this->shape = nullptr;
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} else {
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this->group = nullptr;
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}
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}
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}
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/* static */ int32_t
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HeapReceiverGuard::keyBits(JSObject* obj)
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{
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if (obj->is<UnboxedPlainObject>()) {
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// Both the group and shape need to be guarded for unboxed plain objects.
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return obj->as<UnboxedPlainObject>().maybeExpando() ? 0 : 1;
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}
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if (obj->is<UnboxedArrayObject>() || obj->is<TypedObject>()) {
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// Only the group needs to be guarded for unboxed arrays and typed objects.
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return 2;
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}
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// Other objects only need the shape to be guarded.
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return 3;
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}
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void
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HeapReceiverGuard::trace(JSTracer* trc)
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{
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if (shape_)
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TraceEdge(trc, &shape_, "receiver_guard_shape");
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if (group_)
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TraceEdge(trc, &group_, "receiver_guard_group");
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}
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