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-rw-r--r--js/src/jsobj.cpp3990
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diff --git a/js/src/jsobj.cpp b/js/src/jsobj.cpp
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+++ b/js/src/jsobj.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+/*
+ * JS object implementation.
+ */
+
+#include "jsobjinlines.h"
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/MathAlgorithms.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/SizePrintfMacros.h"
+#include "mozilla/TemplateLib.h"
+
+#include <string.h>
+
+#include "jsapi.h"
+#include "jsarray.h"
+#include "jsatom.h"
+#include "jscntxt.h"
+#include "jsfriendapi.h"
+#include "jsfun.h"
+#include "jsgc.h"
+#include "jsiter.h"
+#include "jsnum.h"
+#include "jsopcode.h"
+#include "jsprf.h"
+#include "jsscript.h"
+#include "jsstr.h"
+#include "jstypes.h"
+#include "jsutil.h"
+#include "jswatchpoint.h"
+#include "jswin.h"
+#include "jswrapper.h"
+
+#include "builtin/Eval.h"
+#include "builtin/Object.h"
+#include "builtin/SymbolObject.h"
+#include "frontend/BytecodeCompiler.h"
+#include "gc/Marking.h"
+#include "gc/Policy.h"
+#include "jit/BaselineJIT.h"
+#include "js/MemoryMetrics.h"
+#include "js/Proxy.h"
+#include "js/UbiNode.h"
+#include "js/UniquePtr.h"
+#include "vm/ArgumentsObject.h"
+#include "vm/Interpreter.h"
+#include "vm/ProxyObject.h"
+#include "vm/RegExpStaticsObject.h"
+#include "vm/Shape.h"
+#include "vm/TypedArrayCommon.h"
+
+#include "jsatominlines.h"
+#include "jsboolinlines.h"
+#include "jscntxtinlines.h"
+#include "jscompartmentinlines.h"
+
+#include "vm/ArrayObject-inl.h"
+#include "vm/BooleanObject-inl.h"
+#include "vm/Caches-inl.h"
+#include "vm/Interpreter-inl.h"
+#include "vm/NativeObject-inl.h"
+#include "vm/NumberObject-inl.h"
+#include "vm/Shape-inl.h"
+#include "vm/StringObject-inl.h"
+
+using namespace js;
+using namespace js::gc;
+
+using mozilla::DebugOnly;
+using mozilla::Maybe;
+
+void
+js::ReportNotObject(JSContext* cx, const Value& v)
+{
+ MOZ_ASSERT(!v.isObject());
+
+ RootedValue value(cx, v);
+ UniqueChars bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, value, nullptr);
+ if (bytes)
+ JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT,
+ bytes.get());
+}
+
+JS_PUBLIC_API(const char*)
+JS::InformalValueTypeName(const Value& v)
+{
+ if (v.isObject())
+ return v.toObject().getClass()->name;
+ if (v.isString())
+ return "string";
+ if (v.isSymbol())
+ return "symbol";
+ if (v.isNumber())
+ return "number";
+ if (v.isBoolean())
+ return "boolean";
+ if (v.isNull())
+ return "null";
+ if (v.isUndefined())
+ return "undefined";
+ return "value";
+}
+
+// ES6 draft rev37 6.2.4.4 FromPropertyDescriptor
+JS_PUBLIC_API(bool)
+JS::FromPropertyDescriptor(JSContext* cx, Handle<PropertyDescriptor> desc, MutableHandleValue vp)
+{
+ AssertHeapIsIdle(cx);
+ CHECK_REQUEST(cx);
+ assertSameCompartment(cx, desc);
+
+ // Step 1.
+ if (!desc.object()) {
+ vp.setUndefined();
+ return true;
+ }
+
+ return FromPropertyDescriptorToObject(cx, desc, vp);
+}
+
+bool
+js::FromPropertyDescriptorToObject(JSContext* cx, Handle<PropertyDescriptor> desc,
+ MutableHandleValue vp)
+{
+ // Step 2-3.
+ RootedObject obj(cx, NewBuiltinClassInstance<PlainObject>(cx));
+ if (!obj)
+ return false;
+
+ const JSAtomState& names = cx->names();
+
+ // Step 4.
+ if (desc.hasValue()) {
+ if (!DefineProperty(cx, obj, names.value, desc.value()))
+ return false;
+ }
+
+ // Step 5.
+ RootedValue v(cx);
+ if (desc.hasWritable()) {
+ v.setBoolean(desc.writable());
+ if (!DefineProperty(cx, obj, names.writable, v))
+ return false;
+ }
+
+ // Step 6.
+ if (desc.hasGetterObject()) {
+ if (JSObject* get = desc.getterObject())
+ v.setObject(*get);
+ else
+ v.setUndefined();
+ if (!DefineProperty(cx, obj, names.get, v))
+ return false;
+ }
+
+ // Step 7.
+ if (desc.hasSetterObject()) {
+ if (JSObject* set = desc.setterObject())
+ v.setObject(*set);
+ else
+ v.setUndefined();
+ if (!DefineProperty(cx, obj, names.set, v))
+ return false;
+ }
+
+ // Step 8.
+ if (desc.hasEnumerable()) {
+ v.setBoolean(desc.enumerable());
+ if (!DefineProperty(cx, obj, names.enumerable, v))
+ return false;
+ }
+
+ // Step 9.
+ if (desc.hasConfigurable()) {
+ v.setBoolean(desc.configurable());
+ if (!DefineProperty(cx, obj, names.configurable, v))
+ return false;
+ }
+
+ vp.setObject(*obj);
+ return true;
+}
+
+bool
+js::GetFirstArgumentAsObject(JSContext* cx, const CallArgs& args, const char* method,
+ MutableHandleObject objp)
+{
+ if (args.length() == 0) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED,
+ method, "0", "s");
+ return false;
+ }
+
+ HandleValue v = args[0];
+ if (!v.isObject()) {
+ UniqueChars bytes = DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, nullptr);
+ if (!bytes)
+ return false;
+ JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, JSMSG_UNEXPECTED_TYPE,
+ bytes.get(), "not an object");
+ return false;
+ }
+
+ objp.set(&v.toObject());
+ return true;
+}
+
+static bool
+GetPropertyIfPresent(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp,
+ bool* foundp)
+{
+ if (!HasProperty(cx, obj, id, foundp))
+ return false;
+ if (!*foundp) {
+ vp.setUndefined();
+ return true;
+ }
+
+ return GetProperty(cx, obj, obj, id, vp);
+}
+
+bool
+js::Throw(JSContext* cx, jsid id, unsigned errorNumber)
+{
+ MOZ_ASSERT(js_ErrorFormatString[errorNumber].argCount == 1);
+
+ RootedValue idVal(cx, IdToValue(id));
+ JSString* idstr = ValueToSource(cx, idVal);
+ if (!idstr)
+ return false;
+ JSAutoByteString bytes(cx, idstr);
+ if (!bytes)
+ return false;
+ JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr, errorNumber, bytes.ptr());
+ return false;
+}
+
+bool
+js::Throw(JSContext* cx, JSObject* obj, unsigned errorNumber)
+{
+ if (js_ErrorFormatString[errorNumber].argCount == 1) {
+ RootedValue val(cx, ObjectValue(*obj));
+ ReportValueErrorFlags(cx, JSREPORT_ERROR, errorNumber,
+ JSDVG_IGNORE_STACK, val, nullptr,
+ nullptr, nullptr);
+ } else {
+ MOZ_ASSERT(js_ErrorFormatString[errorNumber].argCount == 0);
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, errorNumber);
+ }
+ return false;
+}
+
+
+/*** PropertyDescriptor operations and DefineProperties ******************************************/
+
+bool
+CheckCallable(JSContext* cx, JSObject* obj, const char* fieldName)
+{
+ if (obj && !obj->isCallable()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_GET_SET_FIELD,
+ fieldName);
+ return false;
+ }
+ return true;
+}
+
+bool
+js::ToPropertyDescriptor(JSContext* cx, HandleValue descval, bool checkAccessors,
+ MutableHandle<PropertyDescriptor> desc)
+{
+ // step 2
+ RootedObject obj(cx, NonNullObject(cx, descval));
+ if (!obj)
+ return false;
+
+ // step 3
+ desc.clear();
+
+ bool found = false;
+ RootedId id(cx);
+ RootedValue v(cx);
+ unsigned attrs = 0;
+
+ // step 4
+ id = NameToId(cx->names().enumerable);
+ if (!GetPropertyIfPresent(cx, obj, id, &v, &found))
+ return false;
+ if (found) {
+ if (ToBoolean(v))
+ attrs |= JSPROP_ENUMERATE;
+ } else {
+ attrs |= JSPROP_IGNORE_ENUMERATE;
+ }
+
+ // step 5
+ id = NameToId(cx->names().configurable);
+ if (!GetPropertyIfPresent(cx, obj, id, &v, &found))
+ return false;
+ if (found) {
+ if (!ToBoolean(v))
+ attrs |= JSPROP_PERMANENT;
+ } else {
+ attrs |= JSPROP_IGNORE_PERMANENT;
+ }
+
+ // step 6
+ id = NameToId(cx->names().value);
+ if (!GetPropertyIfPresent(cx, obj, id, &v, &found))
+ return false;
+ if (found)
+ desc.value().set(v);
+ else
+ attrs |= JSPROP_IGNORE_VALUE;
+
+ // step 7
+ id = NameToId(cx->names().writable);
+ if (!GetPropertyIfPresent(cx, obj, id, &v, &found))
+ return false;
+ if (found) {
+ if (!ToBoolean(v))
+ attrs |= JSPROP_READONLY;
+ } else {
+ attrs |= JSPROP_IGNORE_READONLY;
+ }
+
+ // step 8
+ bool hasGetOrSet;
+ id = NameToId(cx->names().get);
+ if (!GetPropertyIfPresent(cx, obj, id, &v, &found))
+ return false;
+ hasGetOrSet = found;
+ if (found) {
+ if (v.isObject()) {
+ if (checkAccessors && !CheckCallable(cx, &v.toObject(), js_getter_str))
+ return false;
+ desc.setGetterObject(&v.toObject());
+ } else if (!v.isUndefined()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_GET_SET_FIELD,
+ js_getter_str);
+ return false;
+ }
+ attrs |= JSPROP_GETTER | JSPROP_SHARED;
+ }
+
+ // step 9
+ id = NameToId(cx->names().set);
+ if (!GetPropertyIfPresent(cx, obj, id, &v, &found))
+ return false;
+ hasGetOrSet |= found;
+ if (found) {
+ if (v.isObject()) {
+ if (checkAccessors && !CheckCallable(cx, &v.toObject(), js_setter_str))
+ return false;
+ desc.setSetterObject(&v.toObject());
+ } else if (!v.isUndefined()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_GET_SET_FIELD,
+ js_setter_str);
+ return false;
+ }
+ attrs |= JSPROP_SETTER | JSPROP_SHARED;
+ }
+
+ // step 10
+ if (hasGetOrSet) {
+ if (!(attrs & JSPROP_IGNORE_READONLY) || !(attrs & JSPROP_IGNORE_VALUE)) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_INVALID_DESCRIPTOR);
+ return false;
+ }
+
+ // By convention, these bits are not used on accessor descriptors.
+ attrs &= ~(JSPROP_IGNORE_READONLY | JSPROP_IGNORE_VALUE);
+ }
+
+ desc.setAttributes(attrs);
+ MOZ_ASSERT_IF(attrs & JSPROP_READONLY, !(attrs & (JSPROP_GETTER | JSPROP_SETTER)));
+ MOZ_ASSERT_IF(attrs & (JSPROP_GETTER | JSPROP_SETTER), attrs & JSPROP_SHARED);
+ return true;
+}
+
+bool
+js::CheckPropertyDescriptorAccessors(JSContext* cx, Handle<PropertyDescriptor> desc)
+{
+ if (desc.hasGetterObject()) {
+ if (!CheckCallable(cx, desc.getterObject(), js_getter_str))
+ return false;
+ }
+ if (desc.hasSetterObject()) {
+ if (!CheckCallable(cx, desc.setterObject(), js_setter_str))
+ return false;
+ }
+ return true;
+}
+
+void
+js::CompletePropertyDescriptor(MutableHandle<PropertyDescriptor> desc)
+{
+ desc.assertValid();
+
+ if (desc.isGenericDescriptor() || desc.isDataDescriptor()) {
+ if (!desc.hasWritable())
+ desc.attributesRef() |= JSPROP_READONLY;
+ desc.attributesRef() &= ~(JSPROP_IGNORE_READONLY | JSPROP_IGNORE_VALUE);
+ } else {
+ if (!desc.hasGetterObject())
+ desc.setGetterObject(nullptr);
+ if (!desc.hasSetterObject())
+ desc.setSetterObject(nullptr);
+ desc.attributesRef() |= JSPROP_GETTER | JSPROP_SETTER | JSPROP_SHARED;
+ }
+ if (!desc.hasConfigurable())
+ desc.attributesRef() |= JSPROP_PERMANENT;
+ desc.attributesRef() &= ~(JSPROP_IGNORE_PERMANENT | JSPROP_IGNORE_ENUMERATE);
+
+ desc.assertComplete();
+}
+
+bool
+js::ReadPropertyDescriptors(JSContext* cx, HandleObject props, bool checkAccessors,
+ AutoIdVector* ids, MutableHandle<PropertyDescriptorVector> descs)
+{
+ if (!GetPropertyKeys(cx, props, JSITER_OWNONLY | JSITER_SYMBOLS, ids))
+ return false;
+
+ RootedId id(cx);
+ for (size_t i = 0, len = ids->length(); i < len; i++) {
+ id = (*ids)[i];
+ Rooted<PropertyDescriptor> desc(cx);
+ RootedValue v(cx);
+ if (!GetProperty(cx, props, props, id, &v) ||
+ !ToPropertyDescriptor(cx, v, checkAccessors, &desc) ||
+ !descs.append(desc))
+ {
+ return false;
+ }
+ }
+ return true;
+}
+
+/*** Seal and freeze *****************************************************************************/
+
+static unsigned
+GetSealedOrFrozenAttributes(unsigned attrs, IntegrityLevel level)
+{
+ /* Make all attributes permanent; if freezing, make data attributes read-only. */
+ if (level == IntegrityLevel::Frozen && !(attrs & (JSPROP_GETTER | JSPROP_SETTER)))
+ return JSPROP_PERMANENT | JSPROP_READONLY;
+ return JSPROP_PERMANENT;
+}
+
+/* ES6 draft rev 29 (6 Dec 2014) 7.3.13. */
+bool
+js::SetIntegrityLevel(JSContext* cx, HandleObject obj, IntegrityLevel level)
+{
+ assertSameCompartment(cx, obj);
+
+ // Steps 3-5. (Steps 1-2 are redundant assertions.)
+ if (!PreventExtensions(cx, obj, level))
+ return false;
+
+ // Steps 6-7.
+ AutoIdVector keys(cx);
+ if (!GetPropertyKeys(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY | JSITER_SYMBOLS, &keys))
+ return false;
+
+ // Steps 8-9, loosely interpreted.
+ if (obj->isNative() && !obj->as<NativeObject>().inDictionaryMode() &&
+ !obj->is<TypedArrayObject>())
+ {
+ HandleNativeObject nobj = obj.as<NativeObject>();
+
+ // Seal/freeze non-dictionary objects by constructing a new shape
+ // hierarchy mirroring the original one, which can be shared if many
+ // objects with the same structure are sealed/frozen. If we use the
+ // generic path below then any non-empty object will be converted to
+ // dictionary mode.
+ RootedShape last(cx, EmptyShape::getInitialShape(cx, nobj->getClass(),
+ nobj->taggedProto(),
+ nobj->numFixedSlots(),
+ nobj->lastProperty()->getObjectFlags()));
+ if (!last)
+ return false;
+
+ // Get an in-order list of the shapes in this object.
+ Rooted<ShapeVector> shapes(cx, ShapeVector(cx));
+ for (Shape::Range<NoGC> r(nobj->lastProperty()); !r.empty(); r.popFront()) {
+ if (!shapes.append(&r.front()))
+ return false;
+ }
+ Reverse(shapes.begin(), shapes.end());
+
+ for (Shape* shape : shapes) {
+ Rooted<StackShape> child(cx, StackShape(shape));
+ child.setAttrs(child.attrs() | GetSealedOrFrozenAttributes(child.attrs(), level));
+
+ if (!JSID_IS_EMPTY(child.get().propid) && level == IntegrityLevel::Frozen)
+ MarkTypePropertyNonWritable(cx, nobj, child.get().propid);
+
+ last = cx->zone()->propertyTree.getChild(cx, last, child);
+ if (!last)
+ return false;
+ }
+
+ MOZ_ASSERT(nobj->lastProperty()->slotSpan() == last->slotSpan());
+ JS_ALWAYS_TRUE(nobj->setLastProperty(cx, last));
+
+ // Ordinarily ArraySetLength handles this, but we're going behind its back
+ // right now, so we must do this manually.
+ //
+ // ArraySetLength also implements the capacity <= length invariant for
+ // arrays with non-writable length. We don't need to do anything special
+ // for that, because capacity was zeroed out by preventExtensions. (See
+ // the assertion about getDenseCapacity above.)
+ if (level == IntegrityLevel::Frozen && obj->is<ArrayObject>()) {
+ if (!obj->as<ArrayObject>().maybeCopyElementsForWrite(cx))
+ return false;
+ obj->as<ArrayObject>().getElementsHeader()->setNonwritableArrayLength();
+ }
+ } else {
+ RootedId id(cx);
+ Rooted<PropertyDescriptor> desc(cx);
+
+ const unsigned AllowConfigure = JSPROP_IGNORE_ENUMERATE | JSPROP_IGNORE_READONLY |
+ JSPROP_IGNORE_VALUE;
+ const unsigned AllowConfigureAndWritable = AllowConfigure & ~JSPROP_IGNORE_READONLY;
+
+ // 8.a/9.a. The two different loops are merged here.
+ for (size_t i = 0; i < keys.length(); i++) {
+ id = keys[i];
+
+ if (level == IntegrityLevel::Sealed) {
+ // 8.a.i.
+ desc.setAttributes(AllowConfigure | JSPROP_PERMANENT);
+ } else {
+ // 9.a.i-ii.
+ Rooted<PropertyDescriptor> currentDesc(cx);
+ if (!GetOwnPropertyDescriptor(cx, obj, id, &currentDesc))
+ return false;
+
+ // 9.a.iii.
+ if (!currentDesc.object())
+ continue;
+
+ // 9.a.iii.1-2
+ if (currentDesc.isAccessorDescriptor())
+ desc.setAttributes(AllowConfigure | JSPROP_PERMANENT);
+ else
+ desc.setAttributes(AllowConfigureAndWritable | JSPROP_PERMANENT | JSPROP_READONLY);
+ }
+
+ // 8.a.i-ii. / 9.a.iii.3-4
+ if (!DefineProperty(cx, obj, id, desc))
+ return false;
+ }
+ }
+
+ return true;
+}
+
+// ES6 draft rev33 (12 Feb 2015) 7.3.15
+bool
+js::TestIntegrityLevel(JSContext* cx, HandleObject obj, IntegrityLevel level, bool* result)
+{
+ // Steps 3-6. (Steps 1-2 are redundant assertions.)
+ bool status;
+ if (!IsExtensible(cx, obj, &status))
+ return false;
+ if (status) {
+ *result = false;
+ return true;
+ }
+
+ // Steps 7-8.
+ AutoIdVector props(cx);
+ if (!GetPropertyKeys(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY | JSITER_SYMBOLS, &props))
+ return false;
+
+ // Step 9.
+ RootedId id(cx);
+ Rooted<PropertyDescriptor> desc(cx);
+ for (size_t i = 0, len = props.length(); i < len; i++) {
+ id = props[i];
+
+ // Steps 9.a-b.
+ if (!GetOwnPropertyDescriptor(cx, obj, id, &desc))
+ return false;
+
+ // Step 9.c.
+ if (!desc.object())
+ continue;
+
+ // Steps 9.c.i-ii.
+ if (desc.configurable() ||
+ (level == IntegrityLevel::Frozen && desc.isDataDescriptor() && desc.writable()))
+ {
+ *result = false;
+ return true;
+ }
+ }
+
+ // Step 10.
+ *result = true;
+ return true;
+}
+
+
+/* * */
+
+/*
+ * Get the GC kind to use for scripted 'new' on the given class.
+ * FIXME bug 547327: estimate the size from the allocation site.
+ */
+static inline gc::AllocKind
+NewObjectGCKind(const js::Class* clasp)
+{
+ if (clasp == &ArrayObject::class_)
+ return gc::AllocKind::OBJECT8;
+ if (clasp == &JSFunction::class_)
+ return gc::AllocKind::OBJECT2;
+ return gc::AllocKind::OBJECT4;
+}
+
+static inline JSObject*
+NewObject(ExclusiveContext* cx, HandleObjectGroup group, gc::AllocKind kind,
+ NewObjectKind newKind, uint32_t initialShapeFlags = 0)
+{
+ const Class* clasp = group->clasp();
+
+ MOZ_ASSERT(clasp != &ArrayObject::class_);
+ MOZ_ASSERT_IF(clasp == &JSFunction::class_,
+ kind == AllocKind::FUNCTION || kind == AllocKind::FUNCTION_EXTENDED);
+
+ // For objects which can have fixed data following the object, only use
+ // enough fixed slots to cover the number of reserved slots in the object,
+ // regardless of the allocation kind specified.
+ size_t nfixed = ClassCanHaveFixedData(clasp)
+ ? GetGCKindSlots(gc::GetGCObjectKind(clasp), clasp)
+ : GetGCKindSlots(kind, clasp);
+
+ RootedShape shape(cx, EmptyShape::getInitialShape(cx, clasp, group->proto(), nfixed,
+ initialShapeFlags));
+ if (!shape)
+ return nullptr;
+
+ gc::InitialHeap heap = GetInitialHeap(newKind, clasp);
+ JSObject* obj = JSObject::create(cx, kind, heap, shape, group);
+ if (!obj)
+ return nullptr;
+
+ if (newKind == SingletonObject) {
+ RootedObject nobj(cx, obj);
+ if (!JSObject::setSingleton(cx, nobj))
+ return nullptr;
+ obj = nobj;
+ }
+
+ probes::CreateObject(cx, obj);
+ return obj;
+}
+
+void
+NewObjectCache::fillProto(EntryIndex entry, const Class* clasp, js::TaggedProto proto,
+ gc::AllocKind kind, NativeObject* obj)
+{
+ MOZ_ASSERT_IF(proto.isObject(), !proto.toObject()->is<GlobalObject>());
+ MOZ_ASSERT(obj->taggedProto() == proto);
+ return fill(entry, clasp, proto.raw(), kind, obj);
+}
+
+bool
+js::NewObjectWithTaggedProtoIsCachable(ExclusiveContext* cxArg, Handle<TaggedProto> proto,
+ NewObjectKind newKind, const Class* clasp)
+{
+ return cxArg->isJSContext() &&
+ proto.isObject() &&
+ newKind == GenericObject &&
+ clasp->isNative() &&
+ !proto.toObject()->is<GlobalObject>();
+}
+
+JSObject*
+js::NewObjectWithGivenTaggedProto(ExclusiveContext* cxArg, const Class* clasp,
+ Handle<TaggedProto> proto,
+ gc::AllocKind allocKind, NewObjectKind newKind,
+ uint32_t initialShapeFlags)
+{
+ if (CanBeFinalizedInBackground(allocKind, clasp))
+ allocKind = GetBackgroundAllocKind(allocKind);
+
+ bool isCachable = NewObjectWithTaggedProtoIsCachable(cxArg, proto, newKind, clasp);
+ if (isCachable) {
+ JSContext* cx = cxArg->asJSContext();
+ NewObjectCache& cache = cx->caches.newObjectCache;
+ NewObjectCache::EntryIndex entry = -1;
+ if (cache.lookupProto(clasp, proto.toObject(), allocKind, &entry)) {
+ JSObject* obj = cache.newObjectFromHit(cx, entry, GetInitialHeap(newKind, clasp));
+ if (obj)
+ return obj;
+ }
+ }
+
+ RootedObjectGroup group(cxArg, ObjectGroup::defaultNewGroup(cxArg, clasp, proto, nullptr));
+ if (!group)
+ return nullptr;
+
+ RootedObject obj(cxArg, NewObject(cxArg, group, allocKind, newKind, initialShapeFlags));
+ if (!obj)
+ return nullptr;
+
+ if (isCachable && !obj->as<NativeObject>().hasDynamicSlots()) {
+ NewObjectCache& cache = cxArg->asJSContext()->caches.newObjectCache;
+ NewObjectCache::EntryIndex entry = -1;
+ cache.lookupProto(clasp, proto.toObject(), allocKind, &entry);
+ cache.fillProto(entry, clasp, proto, allocKind, &obj->as<NativeObject>());
+ }
+
+ return obj;
+}
+
+static bool
+NewObjectIsCachable(ExclusiveContext* cxArg, NewObjectKind newKind, const Class* clasp)
+{
+ return cxArg->isJSContext() &&
+ newKind == GenericObject &&
+ clasp->isNative();
+}
+
+JSObject*
+js::NewObjectWithClassProtoCommon(ExclusiveContext* cx, const Class* clasp, HandleObject protoArg,
+ gc::AllocKind allocKind, NewObjectKind newKind)
+{
+ if (protoArg)
+ return NewObjectWithGivenTaggedProto(cx, clasp, AsTaggedProto(protoArg), allocKind, newKind);
+
+ if (CanBeFinalizedInBackground(allocKind, clasp))
+ allocKind = GetBackgroundAllocKind(allocKind);
+
+ Handle<GlobalObject*> global = cx->global();
+
+ bool isCachable = NewObjectIsCachable(cx, newKind, clasp);
+ if (isCachable) {
+ NewObjectCache& cache = cx->asJSContext()->caches.newObjectCache;
+ NewObjectCache::EntryIndex entry = -1;
+ if (cache.lookupGlobal(clasp, global, allocKind, &entry)) {
+ gc::InitialHeap heap = GetInitialHeap(newKind, clasp);
+ JSObject* obj = cache.newObjectFromHit(cx->asJSContext(), entry, heap);
+ if (obj)
+ return obj;
+ }
+ }
+
+ // Find the appropriate proto for clasp. Built-in classes have a cached
+ // proto on cx->global(); all others get %ObjectPrototype%.
+ JSProtoKey protoKey = JSCLASS_CACHED_PROTO_KEY(clasp);
+ if (protoKey == JSProto_Null)
+ protoKey = JSProto_Object;
+
+ RootedObject proto(cx);
+ if (!GetBuiltinPrototype(cx, protoKey, &proto))
+ return nullptr;
+
+ RootedObjectGroup group(cx, ObjectGroup::defaultNewGroup(cx, clasp, AsTaggedProto(proto)));
+ if (!group)
+ return nullptr;
+
+ JSObject* obj = NewObject(cx, group, allocKind, newKind);
+ if (!obj)
+ return nullptr;
+
+ if (isCachable && !obj->as<NativeObject>().hasDynamicSlots()) {
+ NewObjectCache& cache = cx->asJSContext()->caches.newObjectCache;
+ NewObjectCache::EntryIndex entry = -1;
+ cache.lookupGlobal(clasp, global, allocKind, &entry);
+ cache.fillGlobal(entry, clasp, global, allocKind,
+ &obj->as<NativeObject>());
+ }
+
+ return obj;
+}
+
+static bool
+NewObjectWithGroupIsCachable(ExclusiveContext* cx, HandleObjectGroup group,
+ NewObjectKind newKind)
+{
+ return group->proto().isObject() &&
+ newKind == GenericObject &&
+ group->clasp()->isNative() &&
+ (!group->newScript() || group->newScript()->analyzed()) &&
+ cx->isJSContext();
+}
+
+/*
+ * Create a plain object with the specified group. This bypasses getNewGroup to
+ * avoid losing creation site information for objects made by scripted 'new'.
+ */
+JSObject*
+js::NewObjectWithGroupCommon(ExclusiveContext* cx, HandleObjectGroup group,
+ gc::AllocKind allocKind, NewObjectKind newKind)
+{
+ MOZ_ASSERT(gc::IsObjectAllocKind(allocKind));
+ if (CanBeFinalizedInBackground(allocKind, group->clasp()))
+ allocKind = GetBackgroundAllocKind(allocKind);
+
+ bool isCachable = NewObjectWithGroupIsCachable(cx, group, newKind);
+ if (isCachable) {
+ NewObjectCache& cache = cx->asJSContext()->caches.newObjectCache;
+ NewObjectCache::EntryIndex entry = -1;
+ if (cache.lookupGroup(group, allocKind, &entry)) {
+ JSObject* obj = cache.newObjectFromHit(cx->asJSContext(), entry,
+ GetInitialHeap(newKind, group->clasp()));
+ if (obj)
+ return obj;
+ }
+ }
+
+ JSObject* obj = NewObject(cx, group, allocKind, newKind);
+ if (!obj)
+ return nullptr;
+
+ if (isCachable && !obj->as<NativeObject>().hasDynamicSlots()) {
+ NewObjectCache& cache = cx->asJSContext()->caches.newObjectCache;
+ NewObjectCache::EntryIndex entry = -1;
+ cache.lookupGroup(group, allocKind, &entry);
+ cache.fillGroup(entry, group, allocKind, &obj->as<NativeObject>());
+ }
+
+ return obj;
+}
+
+bool
+js::NewObjectScriptedCall(JSContext* cx, MutableHandleObject pobj)
+{
+ jsbytecode* pc;
+ RootedScript script(cx, cx->currentScript(&pc));
+ gc::AllocKind allocKind = NewObjectGCKind(&PlainObject::class_);
+ NewObjectKind newKind = GenericObject;
+ if (script && ObjectGroup::useSingletonForAllocationSite(script, pc, &PlainObject::class_))
+ newKind = SingletonObject;
+ RootedObject obj(cx, NewBuiltinClassInstance<PlainObject>(cx, allocKind, newKind));
+ if (!obj)
+ return false;
+
+ if (script) {
+ /* Try to specialize the group of the object to the scripted call site. */
+ if (!ObjectGroup::setAllocationSiteObjectGroup(cx, script, pc, obj, newKind == SingletonObject))
+ return false;
+ }
+
+ pobj.set(obj);
+ return true;
+}
+
+JSObject*
+js::CreateThis(JSContext* cx, const Class* newclasp, HandleObject callee)
+{
+ RootedObject proto(cx);
+ if (!GetPrototypeFromConstructor(cx, callee, &proto))
+ return nullptr;
+ gc::AllocKind kind = NewObjectGCKind(newclasp);
+ return NewObjectWithClassProto(cx, newclasp, proto, kind);
+}
+
+static inline JSObject*
+CreateThisForFunctionWithGroup(JSContext* cx, HandleObjectGroup group,
+ NewObjectKind newKind)
+{
+ if (group->maybeUnboxedLayout() && newKind != SingletonObject)
+ return UnboxedPlainObject::create(cx, group, newKind);
+
+ if (TypeNewScript* newScript = group->newScript()) {
+ if (newScript->analyzed()) {
+ // The definite properties analysis has been performed for this
+ // group, so get the shape and alloc kind to use from the
+ // TypeNewScript's template.
+ RootedPlainObject templateObject(cx, newScript->templateObject());
+ MOZ_ASSERT(templateObject->group() == group);
+
+ RootedPlainObject res(cx, CopyInitializerObject(cx, templateObject, newKind));
+ if (!res)
+ return nullptr;
+
+ if (newKind == SingletonObject) {
+ Rooted<TaggedProto> proto(cx, TaggedProto(templateObject->staticPrototype()));
+ if (!res->splicePrototype(cx, &PlainObject::class_, proto))
+ return nullptr;
+ } else {
+ res->setGroup(group);
+ }
+ return res;
+ }
+
+ // The initial objects registered with a TypeNewScript can't be in the
+ // nursery.
+ if (newKind == GenericObject)
+ newKind = TenuredObject;
+
+ // Not enough objects with this group have been created yet, so make a
+ // plain object and register it with the group. Use the maximum number
+ // of fixed slots, as is also required by the TypeNewScript.
+ gc::AllocKind allocKind = GuessObjectGCKind(NativeObject::MAX_FIXED_SLOTS);
+ PlainObject* res = NewObjectWithGroup<PlainObject>(cx, group, allocKind, newKind);
+ if (!res)
+ return nullptr;
+
+ // Make sure group->newScript is still there.
+ if (newKind != SingletonObject && group->newScript())
+ group->newScript()->registerNewObject(res);
+
+ return res;
+ }
+
+ gc::AllocKind allocKind = NewObjectGCKind(&PlainObject::class_);
+
+ if (newKind == SingletonObject) {
+ Rooted<TaggedProto> protoRoot(cx, group->proto());
+ return NewObjectWithGivenTaggedProto(cx, &PlainObject::class_, protoRoot, allocKind, newKind);
+ }
+ return NewObjectWithGroup<PlainObject>(cx, group, allocKind, newKind);
+}
+
+JSObject*
+js::CreateThisForFunctionWithProto(JSContext* cx, HandleObject callee, HandleObject newTarget,
+ HandleObject proto, NewObjectKind newKind /* = GenericObject */)
+{
+ RootedObject res(cx);
+
+ if (proto) {
+ RootedObjectGroup group(cx, ObjectGroup::defaultNewGroup(cx, nullptr, TaggedProto(proto),
+ newTarget));
+ if (!group)
+ return nullptr;
+
+ if (group->newScript() && !group->newScript()->analyzed()) {
+ bool regenerate;
+ if (!group->newScript()->maybeAnalyze(cx, group, &regenerate))
+ return nullptr;
+ if (regenerate) {
+ // The script was analyzed successfully and may have changed
+ // the new type table, so refetch the group.
+ group = ObjectGroup::defaultNewGroup(cx, nullptr, TaggedProto(proto),
+ newTarget);
+ MOZ_ASSERT(group && group->newScript());
+ }
+ }
+
+ res = CreateThisForFunctionWithGroup(cx, group, newKind);
+ } else {
+ res = NewBuiltinClassInstance<PlainObject>(cx, newKind);
+ }
+
+ if (res) {
+ JSScript* script = callee->as<JSFunction>().getOrCreateScript(cx);
+ if (!script)
+ return nullptr;
+ TypeScript::SetThis(cx, script, TypeSet::ObjectType(res));
+ }
+
+ return res;
+}
+
+bool
+js::GetPrototypeFromConstructor(JSContext* cx, HandleObject newTarget, MutableHandleObject proto)
+{
+ RootedValue protov(cx);
+ if (!GetProperty(cx, newTarget, newTarget, cx->names().prototype, &protov))
+ return false;
+ proto.set(protov.isObject() ? &protov.toObject() : nullptr);
+ return true;
+}
+
+bool
+js::GetPrototypeFromCallableConstructor(JSContext* cx, const CallArgs& args, MutableHandleObject proto)
+{
+ RootedObject newTarget(cx);
+ if (args.isConstructing())
+ newTarget = &args.newTarget().toObject();
+ else
+ newTarget = &args.callee();
+ return GetPrototypeFromConstructor(cx, newTarget, proto);
+}
+
+JSObject*
+js::CreateThisForFunction(JSContext* cx, HandleObject callee, HandleObject newTarget,
+ NewObjectKind newKind)
+{
+ RootedObject proto(cx);
+ if (!GetPrototypeFromConstructor(cx, newTarget, &proto))
+ return nullptr;
+
+ JSObject* obj = CreateThisForFunctionWithProto(cx, callee, newTarget, proto, newKind);
+
+ if (obj && newKind == SingletonObject) {
+ RootedPlainObject nobj(cx, &obj->as<PlainObject>());
+
+ /* Reshape the singleton before passing it as the 'this' value. */
+ NativeObject::clear(cx, nobj);
+
+ JSScript* calleeScript = callee->as<JSFunction>().nonLazyScript();
+ TypeScript::SetThis(cx, calleeScript, TypeSet::ObjectType(nobj));
+
+ return nobj;
+ }
+
+ return obj;
+}
+
+/* static */ bool
+JSObject::nonNativeSetProperty(JSContext* cx, HandleObject obj, HandleId id, HandleValue v,
+ HandleValue receiver, ObjectOpResult& result)
+{
+ RootedValue value(cx, v);
+ if (MOZ_UNLIKELY(obj->watched())) {
+ WatchpointMap* wpmap = cx->compartment()->watchpointMap;
+ if (wpmap && !wpmap->triggerWatchpoint(cx, obj, id, &value))
+ return false;
+ }
+ return obj->getOpsSetProperty()(cx, obj, id, value, receiver, result);
+}
+
+/* static */ bool
+JSObject::nonNativeSetElement(JSContext* cx, HandleObject obj, uint32_t index, HandleValue v,
+ HandleValue receiver, ObjectOpResult& result)
+{
+ RootedId id(cx);
+ if (!IndexToId(cx, index, &id))
+ return false;
+ return nonNativeSetProperty(cx, obj, id, v, receiver, result);
+}
+
+JS_FRIEND_API(bool)
+JS_CopyPropertyFrom(JSContext* cx, HandleId id, HandleObject target,
+ HandleObject obj, PropertyCopyBehavior copyBehavior)
+{
+ // |obj| and |cx| are generally not same-compartment with |target| here.
+ assertSameCompartment(cx, obj, id);
+ Rooted<PropertyDescriptor> desc(cx);
+
+ if (!GetOwnPropertyDescriptor(cx, obj, id, &desc))
+ return false;
+ MOZ_ASSERT(desc.object());
+
+ // Silently skip JSGetterOp/JSSetterOp-implemented accessors.
+ if (desc.getter() && !desc.hasGetterObject())
+ return true;
+ if (desc.setter() && !desc.hasSetterObject())
+ return true;
+
+ if (copyBehavior == MakeNonConfigurableIntoConfigurable) {
+ // Mask off the JSPROP_PERMANENT bit.
+ desc.attributesRef() &= ~JSPROP_PERMANENT;
+ }
+
+ JSAutoCompartment ac(cx, target);
+ RootedId wrappedId(cx, id);
+ if (!cx->compartment()->wrap(cx, &desc))
+ return false;
+
+ return DefineProperty(cx, target, wrappedId, desc);
+}
+
+JS_FRIEND_API(bool)
+JS_CopyPropertiesFrom(JSContext* cx, HandleObject target, HandleObject obj)
+{
+ JSAutoCompartment ac(cx, obj);
+
+ AutoIdVector props(cx);
+ if (!GetPropertyKeys(cx, obj, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS, &props))
+ return false;
+
+ for (size_t i = 0; i < props.length(); ++i) {
+ if (!JS_CopyPropertyFrom(cx, props[i], target, obj))
+ return false;
+ }
+
+ return true;
+}
+
+static bool
+CopyProxyObject(JSContext* cx, Handle<ProxyObject*> from, Handle<ProxyObject*> to)
+{
+ MOZ_ASSERT(from->getClass() == to->getClass());
+
+ if (from->is<WrapperObject>() &&
+ (Wrapper::wrapperHandler(from)->flags() &
+ Wrapper::CROSS_COMPARTMENT))
+ {
+ to->setCrossCompartmentPrivate(GetProxyPrivate(from));
+ } else {
+ RootedValue v(cx, GetProxyPrivate(from));
+ if (!cx->compartment()->wrap(cx, &v))
+ return false;
+ to->setSameCompartmentPrivate(v);
+ }
+
+ RootedValue v(cx);
+ for (size_t n = 0; n < js::detail::PROXY_EXTRA_SLOTS; n++) {
+ v = GetProxyExtra(from, n);
+ if (!cx->compartment()->wrap(cx, &v))
+ return false;
+ SetProxyExtra(to, n, v);
+ }
+
+ return true;
+}
+
+JSObject*
+js::CloneObject(JSContext* cx, HandleObject obj, Handle<js::TaggedProto> proto)
+{
+ if (!obj->isNative() && !obj->is<ProxyObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
+ return nullptr;
+ }
+
+ RootedObject clone(cx);
+ if (obj->isNative()) {
+ clone = NewObjectWithGivenTaggedProto(cx, obj->getClass(), proto);
+ if (!clone)
+ return nullptr;
+
+ if (clone->is<JSFunction>() && (obj->compartment() != clone->compartment())) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CLONE_OBJECT);
+ return nullptr;
+ }
+
+ if (obj->as<NativeObject>().hasPrivate())
+ clone->as<NativeObject>().setPrivate(obj->as<NativeObject>().getPrivate());
+ } else {
+ ProxyOptions options;
+ options.setClass(obj->getClass());
+
+ clone = ProxyObject::New(cx, GetProxyHandler(obj), JS::NullHandleValue, proto, options);
+ if (!clone)
+ return nullptr;
+
+ if (!CopyProxyObject(cx, obj.as<ProxyObject>(), clone.as<ProxyObject>()))
+ return nullptr;
+ }
+
+ return clone;
+}
+
+static bool
+GetScriptArrayObjectElements(JSContext* cx, HandleObject obj, MutableHandle<GCVector<Value>> values)
+{
+ MOZ_ASSERT(!obj->isSingleton());
+ MOZ_ASSERT(obj->is<ArrayObject>() || obj->is<UnboxedArrayObject>());
+ MOZ_ASSERT(!obj->isIndexed());
+
+ size_t length = GetAnyBoxedOrUnboxedArrayLength(obj);
+ if (!values.appendN(MagicValue(JS_ELEMENTS_HOLE), length))
+ return false;
+
+ size_t initlen = GetAnyBoxedOrUnboxedInitializedLength(obj);
+ for (size_t i = 0; i < initlen; i++)
+ values[i].set(GetAnyBoxedOrUnboxedDenseElement(obj, i));
+
+ return true;
+}
+
+static bool
+GetScriptPlainObjectProperties(JSContext* cx, HandleObject obj,
+ MutableHandle<IdValueVector> properties)
+{
+ if (obj->is<PlainObject>()) {
+ PlainObject* nobj = &obj->as<PlainObject>();
+
+ if (!properties.appendN(IdValuePair(), nobj->slotSpan()))
+ return false;
+
+ for (Shape::Range<NoGC> r(nobj->lastProperty()); !r.empty(); r.popFront()) {
+ Shape& shape = r.front();
+ MOZ_ASSERT(shape.isDataDescriptor());
+ uint32_t slot = shape.slot();
+ properties[slot].get().id = shape.propid();
+ properties[slot].get().value = nobj->getSlot(slot);
+ }
+
+ for (size_t i = 0; i < nobj->getDenseInitializedLength(); i++) {
+ Value v = nobj->getDenseElement(i);
+ if (!v.isMagic(JS_ELEMENTS_HOLE) && !properties.append(IdValuePair(INT_TO_JSID(i), v)))
+ return false;
+ }
+
+ return true;
+ }
+
+ if (obj->is<UnboxedPlainObject>()) {
+ UnboxedPlainObject* nobj = &obj->as<UnboxedPlainObject>();
+
+ const UnboxedLayout& layout = nobj->layout();
+ if (!properties.appendN(IdValuePair(), layout.properties().length()))
+ return false;
+
+ for (size_t i = 0; i < layout.properties().length(); i++) {
+ const UnboxedLayout::Property& property = layout.properties()[i];
+ properties[i].get().id = NameToId(property.name);
+ properties[i].get().value = nobj->getValue(property);
+ }
+
+ return true;
+ }
+
+ MOZ_CRASH("Bad object kind");
+}
+
+static bool
+DeepCloneValue(JSContext* cx, Value* vp, NewObjectKind newKind)
+{
+ if (vp->isObject()) {
+ RootedObject obj(cx, &vp->toObject());
+ obj = DeepCloneObjectLiteral(cx, obj, newKind);
+ if (!obj)
+ return false;
+ vp->setObject(*obj);
+ }
+ return true;
+}
+
+JSObject*
+js::DeepCloneObjectLiteral(JSContext* cx, HandleObject obj, NewObjectKind newKind)
+{
+ /* NB: Keep this in sync with XDRObjectLiteral. */
+ MOZ_ASSERT_IF(obj->isSingleton(),
+ cx->compartment()->behaviors().getSingletonsAsTemplates());
+ MOZ_ASSERT(obj->is<PlainObject>() || obj->is<UnboxedPlainObject>() ||
+ obj->is<ArrayObject>() || obj->is<UnboxedArrayObject>());
+ MOZ_ASSERT(newKind != SingletonObject);
+
+ if (obj->is<ArrayObject>() || obj->is<UnboxedArrayObject>()) {
+ Rooted<GCVector<Value>> values(cx, GCVector<Value>(cx));
+ if (!GetScriptArrayObjectElements(cx, obj, &values))
+ return nullptr;
+
+ // Deep clone any elements.
+ for (uint32_t i = 0; i < values.length(); ++i) {
+ if (!DeepCloneValue(cx, values[i].address(), newKind))
+ return nullptr;
+ }
+
+ ObjectGroup::NewArrayKind arrayKind = ObjectGroup::NewArrayKind::Normal;
+ if (obj->is<ArrayObject>() && obj->as<ArrayObject>().denseElementsAreCopyOnWrite())
+ arrayKind = ObjectGroup::NewArrayKind::CopyOnWrite;
+
+ return ObjectGroup::newArrayObject(cx, values.begin(), values.length(), newKind,
+ arrayKind);
+ }
+
+ Rooted<IdValueVector> properties(cx, IdValueVector(cx));
+ if (!GetScriptPlainObjectProperties(cx, obj, &properties))
+ return nullptr;
+
+ for (size_t i = 0; i < properties.length(); i++) {
+ if (!DeepCloneValue(cx, &properties[i].get().value, newKind))
+ return nullptr;
+ }
+
+ if (obj->isSingleton())
+ newKind = SingletonObject;
+
+ return ObjectGroup::newPlainObject(cx, properties.begin(), properties.length(), newKind);
+}
+
+static bool
+InitializePropertiesFromCompatibleNativeObject(JSContext* cx,
+ HandleNativeObject dst,
+ HandleNativeObject src)
+{
+ assertSameCompartment(cx, src, dst);
+ MOZ_ASSERT(src->getClass() == dst->getClass());
+ MOZ_ASSERT(dst->lastProperty()->getObjectFlags() == 0);
+ MOZ_ASSERT(!src->isSingleton());
+ MOZ_ASSERT(src->numFixedSlots() == dst->numFixedSlots());
+
+ if (!dst->ensureElements(cx, src->getDenseInitializedLength()))
+ return false;
+
+ uint32_t initialized = src->getDenseInitializedLength();
+ for (uint32_t i = 0; i < initialized; ++i) {
+ dst->setDenseInitializedLength(i + 1);
+ dst->initDenseElement(i, src->getDenseElement(i));
+ }
+
+ MOZ_ASSERT(!src->hasPrivate());
+ RootedShape shape(cx);
+ if (src->staticPrototype() == dst->staticPrototype()) {
+ shape = src->lastProperty();
+ } else {
+ // We need to generate a new shape for dst that has dst's proto but all
+ // the property information from src. Note that we asserted above that
+ // dst's object flags are 0.
+ shape = EmptyShape::getInitialShape(cx, dst->getClass(), dst->taggedProto(),
+ dst->numFixedSlots(), 0);
+ if (!shape)
+ return false;
+
+ // Get an in-order list of the shapes in the src object.
+ Rooted<ShapeVector> shapes(cx, ShapeVector(cx));
+ for (Shape::Range<NoGC> r(src->lastProperty()); !r.empty(); r.popFront()) {
+ if (!shapes.append(&r.front()))
+ return false;
+ }
+ Reverse(shapes.begin(), shapes.end());
+
+ for (Shape* shape : shapes) {
+ Rooted<StackShape> child(cx, StackShape(shape));
+ shape = cx->zone()->propertyTree.getChild(cx, shape, child);
+ if (!shape)
+ return false;
+ }
+ }
+ size_t span = shape->slotSpan();
+ if (!dst->setLastProperty(cx, shape))
+ return false;
+ for (size_t i = JSCLASS_RESERVED_SLOTS(src->getClass()); i < span; i++)
+ dst->setSlot(i, src->getSlot(i));
+
+ return true;
+}
+
+JS_FRIEND_API(bool)
+JS_InitializePropertiesFromCompatibleNativeObject(JSContext* cx,
+ HandleObject dst,
+ HandleObject src)
+{
+ return InitializePropertiesFromCompatibleNativeObject(cx,
+ dst.as<NativeObject>(),
+ src.as<NativeObject>());
+}
+
+template<XDRMode mode>
+bool
+js::XDRObjectLiteral(XDRState<mode>* xdr, MutableHandleObject obj)
+{
+ /* NB: Keep this in sync with DeepCloneObjectLiteral. */
+
+ JSContext* cx = xdr->cx();
+ MOZ_ASSERT_IF(mode == XDR_ENCODE && obj->isSingleton(),
+ cx->compartment()->behaviors().getSingletonsAsTemplates());
+
+ // Distinguish between objects and array classes.
+ uint32_t isArray = 0;
+ {
+ if (mode == XDR_ENCODE) {
+ MOZ_ASSERT(obj->is<PlainObject>() ||
+ obj->is<UnboxedPlainObject>() ||
+ obj->is<ArrayObject>() ||
+ obj->is<UnboxedArrayObject>());
+ isArray = (obj->is<ArrayObject>() || obj->is<UnboxedArrayObject>()) ? 1 : 0;
+ }
+
+ if (!xdr->codeUint32(&isArray))
+ return false;
+ }
+
+ RootedValue tmpValue(cx), tmpIdValue(cx);
+ RootedId tmpId(cx);
+
+ if (isArray) {
+ Rooted<GCVector<Value>> values(cx, GCVector<Value>(cx));
+ if (mode == XDR_ENCODE && !GetScriptArrayObjectElements(cx, obj, &values))
+ return false;
+
+ uint32_t initialized;
+ if (mode == XDR_ENCODE)
+ initialized = values.length();
+ if (!xdr->codeUint32(&initialized))
+ return false;
+ if (mode == XDR_DECODE && !values.appendN(MagicValue(JS_ELEMENTS_HOLE), initialized))
+ return false;
+
+ // Recursively copy dense elements.
+ for (unsigned i = 0; i < initialized; i++) {
+ if (!xdr->codeConstValue(values[i]))
+ return false;
+ }
+
+ uint32_t copyOnWrite;
+ if (mode == XDR_ENCODE)
+ copyOnWrite = obj->is<ArrayObject>() &&
+ obj->as<ArrayObject>().denseElementsAreCopyOnWrite();
+ if (!xdr->codeUint32(&copyOnWrite))
+ return false;
+
+ if (mode == XDR_DECODE) {
+ ObjectGroup::NewArrayKind arrayKind = copyOnWrite
+ ? ObjectGroup::NewArrayKind::CopyOnWrite
+ : ObjectGroup::NewArrayKind::Normal;
+ obj.set(ObjectGroup::newArrayObject(cx, values.begin(), values.length(),
+ TenuredObject, arrayKind));
+ if (!obj)
+ return false;
+ }
+
+ return true;
+ }
+
+ // Code the properties in the object.
+ Rooted<IdValueVector> properties(cx, IdValueVector(cx));
+ if (mode == XDR_ENCODE && !GetScriptPlainObjectProperties(cx, obj, &properties))
+ return false;
+
+ uint32_t nproperties = properties.length();
+ if (!xdr->codeUint32(&nproperties))
+ return false;
+
+ if (mode == XDR_DECODE && !properties.appendN(IdValuePair(), nproperties))
+ return false;
+
+ for (size_t i = 0; i < nproperties; i++) {
+ if (mode == XDR_ENCODE) {
+ tmpIdValue = IdToValue(properties[i].get().id);
+ tmpValue = properties[i].get().value;
+ }
+
+ if (!xdr->codeConstValue(&tmpIdValue) || !xdr->codeConstValue(&tmpValue))
+ return false;
+
+ if (mode == XDR_DECODE) {
+ if (!ValueToId<CanGC>(cx, tmpIdValue, &tmpId))
+ return false;
+ properties[i].get().id = tmpId;
+ properties[i].get().value = tmpValue;
+ }
+ }
+
+ // Code whether the object is a singleton.
+ uint32_t isSingleton;
+ if (mode == XDR_ENCODE)
+ isSingleton = obj->isSingleton() ? 1 : 0;
+ if (!xdr->codeUint32(&isSingleton))
+ return false;
+
+ if (mode == XDR_DECODE) {
+ NewObjectKind newKind = isSingleton ? SingletonObject : TenuredObject;
+ obj.set(ObjectGroup::newPlainObject(cx, properties.begin(), properties.length(), newKind));
+ if (!obj)
+ return false;
+ }
+
+ return true;
+}
+
+template bool
+js::XDRObjectLiteral(XDRState<XDR_ENCODE>* xdr, MutableHandleObject obj);
+
+template bool
+js::XDRObjectLiteral(XDRState<XDR_DECODE>* xdr, MutableHandleObject obj);
+
+bool
+NativeObject::fillInAfterSwap(JSContext* cx, const Vector<Value>& values, void* priv)
+{
+ // This object has just been swapped with some other object, and its shape
+ // no longer reflects its allocated size. Correct this information and
+ // fill the slots in with the specified values.
+ MOZ_ASSERT(slotSpan() == values.length());
+
+ // Make sure the shape's numFixedSlots() is correct.
+ size_t nfixed = gc::GetGCKindSlots(asTenured().getAllocKind(), getClass());
+ if (nfixed != shape_->numFixedSlots()) {
+ if (!generateOwnShape(cx))
+ return false;
+ shape_->setNumFixedSlots(nfixed);
+ }
+
+ if (hasPrivate())
+ setPrivate(priv);
+ else
+ MOZ_ASSERT(!priv);
+
+ if (slots_) {
+ js_free(slots_);
+ slots_ = nullptr;
+ }
+
+ if (size_t ndynamic = dynamicSlotsCount(nfixed, values.length(), getClass())) {
+ slots_ = cx->zone()->pod_malloc<HeapSlot>(ndynamic);
+ if (!slots_)
+ return false;
+ Debug_SetSlotRangeToCrashOnTouch(slots_, ndynamic);
+ }
+
+ initSlotRange(0, values.begin(), values.length());
+ return true;
+}
+
+void
+JSObject::fixDictionaryShapeAfterSwap()
+{
+ // Dictionary shapes can point back to their containing objects, so after
+ // swapping the guts of those objects fix the pointers up.
+ if (isNative() && as<NativeObject>().inDictionaryMode())
+ as<NativeObject>().shape_->listp = &as<NativeObject>().shape_;
+}
+
+/* Use this method with extreme caution. It trades the guts of two objects. */
+bool
+JSObject::swap(JSContext* cx, HandleObject a, HandleObject b)
+{
+ // Ensure swap doesn't cause a finalizer to not be run.
+ MOZ_ASSERT(IsBackgroundFinalized(a->asTenured().getAllocKind()) ==
+ IsBackgroundFinalized(b->asTenured().getAllocKind()));
+ MOZ_ASSERT(a->compartment() == b->compartment());
+
+ AutoEnterOOMUnsafeRegion oomUnsafe;
+
+ AutoCompartment ac(cx, a);
+
+ if (!a->getGroup(cx))
+ oomUnsafe.crash("JSObject::swap");
+ if (!b->getGroup(cx))
+ oomUnsafe.crash("JSObject::swap");
+
+ /*
+ * Neither object may be in the nursery, but ensure we update any embedded
+ * nursery pointers in either object.
+ */
+ MOZ_ASSERT(!IsInsideNursery(a) && !IsInsideNursery(b));
+ cx->runtime()->gc.storeBuffer.putWholeCell(a);
+ cx->runtime()->gc.storeBuffer.putWholeCell(b);
+
+ unsigned r = NotifyGCPreSwap(a, b);
+
+ // Do the fundamental swapping of the contents of two objects.
+ MOZ_ASSERT(a->compartment() == b->compartment());
+ MOZ_ASSERT(a->is<JSFunction>() == b->is<JSFunction>());
+
+ // Don't try to swap functions with different sizes.
+ MOZ_ASSERT_IF(a->is<JSFunction>(), a->tenuredSizeOfThis() == b->tenuredSizeOfThis());
+
+ // Watch for oddball objects that have special organizational issues and
+ // can't be swapped.
+ MOZ_ASSERT(!a->is<RegExpObject>() && !b->is<RegExpObject>());
+ MOZ_ASSERT(!a->is<ArrayObject>() && !b->is<ArrayObject>());
+ MOZ_ASSERT(!a->is<ArrayBufferObject>() && !b->is<ArrayBufferObject>());
+ MOZ_ASSERT(!a->is<TypedArrayObject>() && !b->is<TypedArrayObject>());
+ MOZ_ASSERT(!a->is<TypedObject>() && !b->is<TypedObject>());
+
+ if (a->tenuredSizeOfThis() == b->tenuredSizeOfThis()) {
+ // When both objects are the same size, just do a plain swap of their
+ // contents.
+ size_t size = a->tenuredSizeOfThis();
+
+ char tmp[mozilla::tl::Max<sizeof(JSFunction), sizeof(JSObject_Slots16)>::value];
+ MOZ_ASSERT(size <= sizeof(tmp));
+
+ js_memcpy(tmp, a, size);
+ js_memcpy(a, b, size);
+ js_memcpy(b, tmp, size);
+
+ a->fixDictionaryShapeAfterSwap();
+ b->fixDictionaryShapeAfterSwap();
+ } else {
+ // Avoid GC in here to avoid confusing the tracing code with our
+ // intermediate state.
+ AutoSuppressGC suppress(cx);
+
+ // When the objects have different sizes, they will have different
+ // numbers of fixed slots before and after the swap, so the slots for
+ // native objects will need to be rearranged.
+ NativeObject* na = a->isNative() ? &a->as<NativeObject>() : nullptr;
+ NativeObject* nb = b->isNative() ? &b->as<NativeObject>() : nullptr;
+
+ // Remember the original values from the objects.
+ Vector<Value> avals(cx);
+ void* apriv = nullptr;
+ if (na) {
+ apriv = na->hasPrivate() ? na->getPrivate() : nullptr;
+ for (size_t i = 0; i < na->slotSpan(); i++) {
+ if (!avals.append(na->getSlot(i)))
+ oomUnsafe.crash("JSObject::swap");
+ }
+ }
+ Vector<Value> bvals(cx);
+ void* bpriv = nullptr;
+ if (nb) {
+ bpriv = nb->hasPrivate() ? nb->getPrivate() : nullptr;
+ for (size_t i = 0; i < nb->slotSpan(); i++) {
+ if (!bvals.append(nb->getSlot(i)))
+ oomUnsafe.crash("JSObject::swap");
+ }
+ }
+
+ // Swap the main fields of the objects, whether they are native objects or proxies.
+ char tmp[sizeof(JSObject_Slots0)];
+ js_memcpy(&tmp, a, sizeof tmp);
+ js_memcpy(a, b, sizeof tmp);
+ js_memcpy(b, &tmp, sizeof tmp);
+
+ a->fixDictionaryShapeAfterSwap();
+ b->fixDictionaryShapeAfterSwap();
+
+ if (na && !b->as<NativeObject>().fillInAfterSwap(cx, avals, apriv))
+ oomUnsafe.crash("fillInAfterSwap");
+ if (nb && !a->as<NativeObject>().fillInAfterSwap(cx, bvals, bpriv))
+ oomUnsafe.crash("fillInAfterSwap");
+ }
+
+ // Swapping the contents of two objects invalidates type sets which contain
+ // either of the objects, so mark all such sets as unknown.
+ MarkObjectGroupUnknownProperties(cx, a->group());
+ MarkObjectGroupUnknownProperties(cx, b->group());
+
+ /*
+ * We need a write barrier here. If |a| was marked and |b| was not, then
+ * after the swap, |b|'s guts would never be marked. The write barrier
+ * solves this.
+ *
+ * Normally write barriers happen before the write. However, that's not
+ * necessary here because nothing is being destroyed. We're just swapping.
+ */
+ JS::Zone* zone = a->zone();
+ if (zone->needsIncrementalBarrier()) {
+ a->traceChildren(zone->barrierTracer());
+ b->traceChildren(zone->barrierTracer());
+ }
+
+ NotifyGCPostSwap(a, b, r);
+ return true;
+}
+
+static bool
+DefineStandardSlot(JSContext* cx, HandleObject obj, JSProtoKey key, JSAtom* atom,
+ HandleValue v, uint32_t attrs, bool& named)
+{
+ RootedId id(cx, AtomToId(atom));
+ named = DefineProperty(cx, obj, id, v, nullptr, nullptr, attrs);
+ return named;
+}
+
+static void
+SetClassObject(JSObject* obj, JSProtoKey key, JSObject* cobj, JSObject* proto)
+{
+ if (!obj->is<GlobalObject>())
+ return;
+
+ obj->as<GlobalObject>().setConstructor(key, ObjectOrNullValue(cobj));
+ obj->as<GlobalObject>().setPrototype(key, ObjectOrNullValue(proto));
+}
+
+static void
+ClearClassObject(JSObject* obj, JSProtoKey key)
+{
+ if (!obj->is<GlobalObject>())
+ return;
+
+ obj->as<GlobalObject>().setConstructor(key, UndefinedValue());
+ obj->as<GlobalObject>().setPrototype(key, UndefinedValue());
+}
+
+static NativeObject*
+DefineConstructorAndPrototype(JSContext* cx, HandleObject obj, JSProtoKey key, HandleAtom atom,
+ HandleObject protoProto, const Class* clasp,
+ Native constructor, unsigned nargs,
+ const JSPropertySpec* ps, const JSFunctionSpec* fs,
+ const JSPropertySpec* static_ps, const JSFunctionSpec* static_fs,
+ NativeObject** ctorp, AllocKind ctorKind)
+{
+ /*
+ * Create a prototype object for this class.
+ *
+ * FIXME: lazy standard (built-in) class initialization and even older
+ * eager boostrapping code rely on all of these properties:
+ *
+ * 1. NewObject attempting to compute a default prototype object when
+ * passed null for proto; and
+ *
+ * 2. NewObject tolerating no default prototype (null proto slot value)
+ * due to this js::InitClass call coming from js::InitFunctionClass on an
+ * otherwise-uninitialized global.
+ *
+ * 3. NewObject allocating a JSFunction-sized GC-thing when clasp is
+ * &JSFunction::class_, not a JSObject-sized (smaller) GC-thing.
+ *
+ * The JS_NewObjectForGivenProto and JS_NewObject APIs also allow clasp to
+ * be &JSFunction::class_ (we could break compatibility easily). But
+ * fixing (3) is not enough without addressing the bootstrapping dependency
+ * on (1) and (2).
+ */
+
+ /*
+ * Create the prototype object. (GlobalObject::createBlankPrototype isn't
+ * used because it won't let us use protoProto as the proto.
+ */
+ RootedNativeObject proto(cx, NewNativeObjectWithClassProto(cx, clasp, protoProto, SingletonObject));
+ if (!proto)
+ return nullptr;
+
+ /* After this point, control must exit via label bad or out. */
+ RootedNativeObject ctor(cx);
+ bool named = false;
+ bool cached = false;
+ if (!constructor) {
+ /*
+ * Lacking a constructor, name the prototype (e.g., Math) unless this
+ * class (a) is anonymous, i.e. for internal use only; (b) the class
+ * of obj (the global object) is has a reserved slot indexed by key;
+ * and (c) key is not the null key.
+ */
+ if (!(clasp->flags & JSCLASS_IS_ANONYMOUS) || !obj->is<GlobalObject>() ||
+ key == JSProto_Null)
+ {
+ uint32_t attrs = (clasp->flags & JSCLASS_IS_ANONYMOUS)
+ ? JSPROP_READONLY | JSPROP_PERMANENT
+ : 0;
+ RootedValue value(cx, ObjectValue(*proto));
+ if (!DefineStandardSlot(cx, obj, key, atom, value, attrs, named))
+ goto bad;
+ }
+
+ ctor = proto;
+ } else {
+ RootedFunction fun(cx, NewNativeConstructor(cx, constructor, nargs, atom, ctorKind));
+ if (!fun)
+ goto bad;
+
+ /*
+ * Set the class object early for standard class constructors. Type
+ * inference may need to access these, and js::GetBuiltinPrototype will
+ * fail if it tries to do a reentrant reconstruction of the class.
+ */
+ if (key != JSProto_Null) {
+ SetClassObject(obj, key, fun, proto);
+ cached = true;
+ }
+
+ RootedValue value(cx, ObjectValue(*fun));
+ if (!DefineStandardSlot(cx, obj, key, atom, value, 0, named))
+ goto bad;
+
+ /*
+ * Optionally construct the prototype object, before the class has
+ * been fully initialized. Allow the ctor to replace proto with a
+ * different object, as is done for operator new.
+ */
+ ctor = fun;
+ if (!LinkConstructorAndPrototype(cx, ctor, proto))
+ goto bad;
+
+ /* Bootstrap Function.prototype (see also JS_InitStandardClasses). */
+ Rooted<TaggedProto> tagged(cx, TaggedProto(proto));
+ if (ctor->getClass() == clasp && !ctor->splicePrototype(cx, clasp, tagged))
+ goto bad;
+ }
+
+ if (!DefinePropertiesAndFunctions(cx, proto, ps, fs) ||
+ (ctor != proto && !DefinePropertiesAndFunctions(cx, ctor, static_ps, static_fs)))
+ {
+ goto bad;
+ }
+
+ /* If this is a standard class, cache its prototype. */
+ if (!cached && key != JSProto_Null)
+ SetClassObject(obj, key, ctor, proto);
+
+ if (ctorp)
+ *ctorp = ctor;
+ return proto;
+
+bad:
+ if (named) {
+ ObjectOpResult ignored;
+ RootedId id(cx, AtomToId(atom));
+
+ // XXX FIXME - absurd to call this here; instead define the property last.
+ DeleteProperty(cx, obj, id, ignored);
+ }
+ if (cached)
+ ClearClassObject(obj, key);
+ return nullptr;
+}
+
+NativeObject*
+js::InitClass(JSContext* cx, HandleObject obj, HandleObject protoProto_,
+ const Class* clasp, Native constructor, unsigned nargs,
+ const JSPropertySpec* ps, const JSFunctionSpec* fs,
+ const JSPropertySpec* static_ps, const JSFunctionSpec* static_fs,
+ NativeObject** ctorp, AllocKind ctorKind)
+{
+ RootedObject protoProto(cx, protoProto_);
+
+ /* Check function pointer members. */
+ MOZ_ASSERT(clasp->getGetProperty() != JS_PropertyStub);
+ MOZ_ASSERT(clasp->getSetProperty() != JS_StrictPropertyStub);
+
+ RootedAtom atom(cx, Atomize(cx, clasp->name, strlen(clasp->name)));
+ if (!atom)
+ return nullptr;
+
+ /*
+ * All instances of the class will inherit properties from the prototype
+ * object we are about to create (in DefineConstructorAndPrototype), which
+ * in turn will inherit from protoProto.
+ *
+ * When initializing a standard class (other than Object), if protoProto is
+ * null, default to Object.prototype. The engine's internal uses of
+ * js::InitClass depend on this nicety.
+ */
+ JSProtoKey key = JSCLASS_CACHED_PROTO_KEY(clasp);
+ if (key != JSProto_Null &&
+ !protoProto &&
+ !GetBuiltinPrototype(cx, JSProto_Object, &protoProto))
+ {
+ return nullptr;
+ }
+
+ return DefineConstructorAndPrototype(cx, obj, key, atom, protoProto, clasp, constructor, nargs,
+ ps, fs, static_ps, static_fs, ctorp, ctorKind);
+}
+
+void
+JSObject::fixupAfterMovingGC()
+{
+ // For copy-on-write objects that don't own their elements, fix up the
+ // elements pointer if it points to inline elements in the owning object.
+ if (is<NativeObject>()) {
+ NativeObject& obj = as<NativeObject>();
+ if (obj.denseElementsAreCopyOnWrite()) {
+ NativeObject* owner = obj.getElementsHeader()->ownerObject();
+ // Get the new owner pointer but don't call MaybeForwarded as we
+ // don't need to access the object's shape.
+ if (IsForwarded(owner))
+ owner = Forwarded(owner);
+ if (owner != &obj && owner->hasFixedElements())
+ obj.elements_ = owner->getElementsHeader()->elements();
+ MOZ_ASSERT(!IsForwarded(obj.getElementsHeader()->ownerObject().get()));
+ }
+ }
+}
+
+bool
+js::SetClassAndProto(JSContext* cx, HandleObject obj,
+ const Class* clasp, Handle<js::TaggedProto> proto)
+{
+ // Regenerate the object's shape. If the object is a proto (isDelegate()),
+ // we also need to regenerate shapes for all of the objects along the old
+ // prototype chain, in case any entries were filled by looking up through
+ // obj. Stop when a non-native object is found, prototype lookups will not
+ // be cached across these.
+ //
+ // How this shape change is done is very delicate; the change can be made
+ // either by marking the object's prototype as uncacheable (such that the
+ // JIT'ed ICs cannot assume the shape determines the prototype) or by just
+ // generating a new shape for the object. Choosing the former is bad if the
+ // object is on the prototype chain of other objects, as the uncacheable
+ // prototype can inhibit iterator caches on those objects and slow down
+ // prototype accesses. Choosing the latter is bad if there are many similar
+ // objects to this one which will have their prototype mutated, as the
+ // generateOwnShape forces the object into dictionary mode and similar
+ // property lineages will be repeatedly cloned.
+ //
+ // :XXX: bug 707717 make this code less brittle.
+ RootedObject oldproto(cx, obj);
+ while (oldproto && oldproto->isNative()) {
+ if (oldproto->isSingleton()) {
+ // We always generate a new shape if the object is a singleton,
+ // regardless of the uncacheable-proto flag. ICs may rely on
+ // this.
+ if (!oldproto->as<NativeObject>().generateOwnShape(cx))
+ return false;
+ } else {
+ if (!oldproto->setUncacheableProto(cx))
+ return false;
+ }
+ if (!obj->isDelegate()) {
+ // If |obj| is not a proto of another object, we don't need to
+ // reshape the whole proto chain.
+ MOZ_ASSERT(obj == oldproto);
+ break;
+ }
+ oldproto = oldproto->staticPrototype();
+ }
+
+ if (proto.isObject() && !proto.toObject()->setDelegate(cx))
+ return false;
+
+ if (obj->isSingleton()) {
+ /*
+ * Just splice the prototype, but mark the properties as unknown for
+ * consistent behavior.
+ */
+ if (!obj->splicePrototype(cx, clasp, proto))
+ return false;
+ MarkObjectGroupUnknownProperties(cx, obj->group());
+ return true;
+ }
+
+ if (proto.isObject()) {
+ RootedObject protoObj(cx, proto.toObject());
+ if (!JSObject::setNewGroupUnknown(cx, clasp, protoObj))
+ return false;
+ }
+
+ ObjectGroup* group = ObjectGroup::defaultNewGroup(cx, clasp, proto);
+ if (!group)
+ return false;
+
+ /*
+ * Setting __proto__ on an object that has escaped and may be referenced by
+ * other heap objects can only be done if the properties of both objects
+ * are unknown. Type sets containing this object will contain the original
+ * type but not the new type of the object, so we need to treat all such
+ * type sets as unknown.
+ */
+ MarkObjectGroupUnknownProperties(cx, obj->group());
+ MarkObjectGroupUnknownProperties(cx, group);
+
+ obj->setGroup(group);
+
+ return true;
+}
+
+/* static */ bool
+JSObject::changeToSingleton(JSContext* cx, HandleObject obj)
+{
+ MOZ_ASSERT(!obj->isSingleton());
+
+ MarkObjectGroupUnknownProperties(cx, obj->group());
+
+ ObjectGroup* group = ObjectGroup::lazySingletonGroup(cx, obj->getClass(),
+ obj->taggedProto());
+ if (!group)
+ return false;
+
+ obj->group_ = group;
+ return true;
+}
+
+static bool
+MaybeResolveConstructor(ExclusiveContext* cxArg, Handle<GlobalObject*> global, JSProtoKey key)
+{
+ if (global->isStandardClassResolved(key))
+ return true;
+ if (!cxArg->shouldBeJSContext())
+ return false;
+
+ JSContext* cx = cxArg->asJSContext();
+ return GlobalObject::resolveConstructor(cx, global, key);
+}
+
+bool
+js::GetBuiltinConstructor(ExclusiveContext* cx, JSProtoKey key, MutableHandleObject objp)
+{
+ MOZ_ASSERT(key != JSProto_Null);
+ Rooted<GlobalObject*> global(cx, cx->global());
+ if (!MaybeResolveConstructor(cx, global, key))
+ return false;
+
+ objp.set(&global->getConstructor(key).toObject());
+ return true;
+}
+
+bool
+js::GetBuiltinPrototype(ExclusiveContext* cx, JSProtoKey key, MutableHandleObject protop)
+{
+ MOZ_ASSERT(key != JSProto_Null);
+ Rooted<GlobalObject*> global(cx, cx->global());
+ if (!MaybeResolveConstructor(cx, global, key))
+ return false;
+
+ protop.set(&global->getPrototype(key).toObject());
+ return true;
+}
+
+bool
+js::IsStandardPrototype(JSObject* obj, JSProtoKey key)
+{
+ GlobalObject& global = obj->global();
+ Value v = global.getPrototype(key);
+ return v.isObject() && obj == &v.toObject();
+}
+
+
+/**
+ * Returns the original Object.prototype from the embedding-provided incumbent
+ * global.
+ *
+ * Really, we want the incumbent global itself so we can pass it to other
+ * embedding hooks which need it. Specifically, the enqueue promise hook
+ * takes an incumbent global so it can set that on the PromiseCallbackJob
+ * it creates.
+ *
+ * The reason for not just returning the global itself is that we'd need to
+ * wrap it into the current compartment, and later unwrap it. Unwrapping
+ * globals is tricky, though: we might accidentally unwrap through an inner
+ * to its outer window and end up with the wrong global. Plain objects don't
+ * have this problem, so we use the global's Object.prototype. The code using
+ * it - e.g. EnqueuePromiseReactionJob - can then unwrap the object and get
+ * its global without fear of unwrapping too far.
+ */
+bool
+js::GetObjectFromIncumbentGlobal(JSContext* cx, MutableHandleObject obj)
+{
+ RootedObject globalObj(cx, cx->runtime()->getIncumbentGlobal(cx));
+ if (!globalObj) {
+ obj.set(nullptr);
+ return true;
+ }
+
+ {
+ AutoCompartment ac(cx, globalObj);
+ obj.set(globalObj->as<GlobalObject>().getOrCreateObjectPrototype(cx));
+ if (!obj)
+ return false;
+ }
+
+ // The object might be from a different compartment, so wrap it.
+ if (obj && !cx->compartment()->wrap(cx, obj))
+ return false;
+
+ return true;
+}
+
+JSProtoKey
+JS::IdentifyStandardInstance(JSObject* obj)
+{
+ // Note: The prototype shares its JSClass with instances.
+ MOZ_ASSERT(!obj->is<CrossCompartmentWrapperObject>());
+ JSProtoKey key = StandardProtoKeyOrNull(obj);
+ if (key != JSProto_Null && !IsStandardPrototype(obj, key))
+ return key;
+ return JSProto_Null;
+}
+
+JSProtoKey
+JS::IdentifyStandardPrototype(JSObject* obj)
+{
+ // Note: The prototype shares its JSClass with instances.
+ MOZ_ASSERT(!obj->is<CrossCompartmentWrapperObject>());
+ JSProtoKey key = StandardProtoKeyOrNull(obj);
+ if (key != JSProto_Null && IsStandardPrototype(obj, key))
+ return key;
+ return JSProto_Null;
+}
+
+JSProtoKey
+JS::IdentifyStandardInstanceOrPrototype(JSObject* obj)
+{
+ return StandardProtoKeyOrNull(obj);
+}
+
+JSProtoKey
+JS::IdentifyStandardConstructor(JSObject* obj)
+{
+ // Note that NATIVE_CTOR does not imply that we are a standard constructor,
+ // but the converse is true (at least until we start having self-hosted
+ // constructors for standard classes). This lets us avoid a costly loop for
+ // many functions (which, depending on the call site, may be the common case).
+ if (!obj->is<JSFunction>() || !(obj->as<JSFunction>().flags() & JSFunction::NATIVE_CTOR))
+ return JSProto_Null;
+
+ GlobalObject& global = obj->global();
+ for (size_t k = 0; k < JSProto_LIMIT; ++k) {
+ JSProtoKey key = static_cast<JSProtoKey>(k);
+ if (global.getConstructor(key) == ObjectValue(*obj))
+ return key;
+ }
+
+ return JSProto_Null;
+}
+
+bool
+JSObject::isCallable() const
+{
+ if (is<JSFunction>())
+ return true;
+ return callHook() != nullptr;
+}
+
+bool
+JSObject::isConstructor() const
+{
+ if (is<JSFunction>()) {
+ const JSFunction& fun = as<JSFunction>();
+ return fun.isConstructor();
+ }
+ return constructHook() != nullptr;
+}
+
+JSNative
+JSObject::callHook() const
+{
+ const js::Class* clasp = getClass();
+
+ if (JSNative call = clasp->getCall())
+ return call;
+
+ if (is<js::ProxyObject>()) {
+ const js::ProxyObject& p = as<js::ProxyObject>();
+ if (p.handler()->isCallable(const_cast<JSObject*>(this)))
+ return js::proxy_Call;
+ }
+ return nullptr;
+}
+
+JSNative
+JSObject::constructHook() const
+{
+ const js::Class* clasp = getClass();
+
+ if (JSNative construct = clasp->getConstruct())
+ return construct;
+
+ if (is<js::ProxyObject>()) {
+ const js::ProxyObject& p = as<js::ProxyObject>();
+ if (p.handler()->isConstructor(const_cast<JSObject*>(this)))
+ return js::proxy_Construct;
+ }
+ return nullptr;
+}
+
+bool
+js::LookupProperty(JSContext* cx, HandleObject obj, js::HandleId id,
+ MutableHandleObject objp, MutableHandleShape propp)
+{
+ /* NB: The logic of lookupProperty is implicitly reflected in
+ * BaselineIC.cpp's |EffectlesslyLookupProperty| logic.
+ * If this changes, please remember to update the logic there as well.
+ */
+ if (LookupPropertyOp op = obj->getOpsLookupProperty())
+ return op(cx, obj, id, objp, propp);
+ return LookupPropertyInline<CanGC>(cx, obj.as<NativeObject>(), id, objp, propp);
+}
+
+bool
+js::LookupName(JSContext* cx, HandlePropertyName name, HandleObject envChain,
+ MutableHandleObject objp, MutableHandleObject pobjp, MutableHandleShape propp)
+{
+ RootedId id(cx, NameToId(name));
+
+ for (RootedObject env(cx, envChain); env; env = env->enclosingEnvironment()) {
+ if (!LookupProperty(cx, env, id, pobjp, propp))
+ return false;
+ if (propp) {
+ objp.set(env);
+ return true;
+ }
+ }
+
+ objp.set(nullptr);
+ pobjp.set(nullptr);
+ propp.set(nullptr);
+ return true;
+}
+
+bool
+js::LookupNameNoGC(JSContext* cx, PropertyName* name, JSObject* envChain,
+ JSObject** objp, JSObject** pobjp, Shape** propp)
+{
+ AutoAssertNoException nogc(cx);
+
+ MOZ_ASSERT(!*objp && !*pobjp && !*propp);
+
+ for (JSObject* env = envChain; env; env = env->enclosingEnvironment()) {
+ if (env->getOpsLookupProperty())
+ return false;
+ if (!LookupPropertyInline<NoGC>(cx, &env->as<NativeObject>(), NameToId(name), pobjp, propp))
+ return false;
+ if (*propp) {
+ *objp = env;
+ return true;
+ }
+ }
+
+ return true;
+}
+
+bool
+js::LookupNameWithGlobalDefault(JSContext* cx, HandlePropertyName name, HandleObject envChain,
+ MutableHandleObject objp)
+{
+ RootedId id(cx, NameToId(name));
+
+ RootedObject pobj(cx);
+ RootedShape shape(cx);
+
+ RootedObject env(cx, envChain);
+ for (; !env->is<GlobalObject>(); env = env->enclosingEnvironment()) {
+ if (!LookupProperty(cx, env, id, &pobj, &shape))
+ return false;
+ if (shape)
+ break;
+ }
+
+ objp.set(env);
+ return true;
+}
+
+bool
+js::LookupNameUnqualified(JSContext* cx, HandlePropertyName name, HandleObject envChain,
+ MutableHandleObject objp)
+{
+ RootedId id(cx, NameToId(name));
+
+ RootedObject pobj(cx);
+ RootedShape shape(cx);
+
+ RootedObject env(cx, envChain);
+ for (; !env->isUnqualifiedVarObj(); env = env->enclosingEnvironment()) {
+ if (!LookupProperty(cx, env, id, &pobj, &shape))
+ return false;
+ if (shape)
+ break;
+ }
+
+ // See note above RuntimeLexicalErrorObject.
+ if (pobj == env) {
+ bool isTDZ = false;
+ if (shape && name != cx->names().dotThis) {
+ // Treat Debugger environments specially for TDZ checks, as they
+ // look like non-native environments but in fact wrap native
+ // environments.
+ if (env->is<DebugEnvironmentProxy>()) {
+ RootedValue v(cx);
+ if (!env->as<DebugEnvironmentProxy>().getMaybeSentinelValue(cx, id, &v))
+ return false;
+ isTDZ = IsUninitializedLexical(v);
+ } else {
+ isTDZ = IsUninitializedLexicalSlot(env, shape);
+ }
+ }
+
+ if (isTDZ) {
+ env = RuntimeLexicalErrorObject::create(cx, env, JSMSG_UNINITIALIZED_LEXICAL);
+ if (!env)
+ return false;
+ } else if (env->is<LexicalEnvironmentObject>() && !shape->writable()) {
+ // Assigning to a named lambda callee name is a no-op in sloppy mode.
+ Rooted<LexicalEnvironmentObject*> lexicalEnv(cx, &env->as<LexicalEnvironmentObject>());
+ if (lexicalEnv->isExtensible() ||
+ lexicalEnv->scope().kind() != ScopeKind::NamedLambda)
+ {
+ MOZ_ASSERT(name != cx->names().dotThis);
+ env = RuntimeLexicalErrorObject::create(cx, env, JSMSG_BAD_CONST_ASSIGN);
+ if (!env)
+ return false;
+ }
+ }
+ }
+
+ objp.set(env);
+ return true;
+}
+
+bool
+js::HasOwnProperty(JSContext* cx, HandleObject obj, HandleId id, bool* result)
+{
+ if (obj->is<ProxyObject>())
+ return Proxy::hasOwn(cx, obj, id, result);
+
+ if (GetOwnPropertyOp op = obj->getOpsGetOwnPropertyDescriptor()) {
+ Rooted<PropertyDescriptor> desc(cx);
+ if (!op(cx, obj, id, &desc))
+ return false;
+ *result = !!desc.object();
+ return true;
+ }
+
+ RootedShape shape(cx);
+ if (!NativeLookupOwnProperty<CanGC>(cx, obj.as<NativeObject>(), id, &shape))
+ return false;
+ *result = (shape != nullptr);
+ return true;
+}
+
+bool
+js::LookupPropertyPure(ExclusiveContext* cx, JSObject* obj, jsid id, JSObject** objp,
+ Shape** propp)
+{
+ bool isTypedArrayOutOfRange = false;
+ do {
+ if (!LookupOwnPropertyPure(cx, obj, id, propp, &isTypedArrayOutOfRange))
+ return false;
+
+ if (*propp) {
+ *objp = obj;
+ return true;
+ }
+
+ if (isTypedArrayOutOfRange) {
+ *objp = nullptr;
+ return true;
+ }
+
+ obj = obj->staticPrototype();
+ } while (obj);
+
+ *objp = nullptr;
+ *propp = nullptr;
+ return true;
+}
+
+bool
+js::LookupOwnPropertyPure(ExclusiveContext* cx, JSObject* obj, jsid id, Shape** propp,
+ bool* isTypedArrayOutOfRange /* = nullptr */)
+{
+ JS::AutoCheckCannotGC nogc;
+ if (isTypedArrayOutOfRange)
+ *isTypedArrayOutOfRange = false;
+
+ if (obj->isNative()) {
+ // Search for a native dense element, typed array element, or property.
+
+ if (JSID_IS_INT(id) && obj->as<NativeObject>().containsDenseElement(JSID_TO_INT(id))) {
+ MarkDenseOrTypedArrayElementFound<NoGC>(propp);
+ return true;
+ }
+
+ if (obj->is<TypedArrayObject>()) {
+ uint64_t index;
+ if (IsTypedArrayIndex(id, &index)) {
+ if (index < obj->as<TypedArrayObject>().length()) {
+ MarkDenseOrTypedArrayElementFound<NoGC>(propp);
+ } else {
+ *propp = nullptr;
+ if (isTypedArrayOutOfRange)
+ *isTypedArrayOutOfRange = true;
+ }
+ return true;
+ }
+ }
+
+ if (Shape* shape = obj->as<NativeObject>().lookupPure(id)) {
+ *propp = shape;
+ return true;
+ }
+
+ // Fail if there's a resolve hook, unless the mayResolve hook tells
+ // us the resolve hook won't define a property with this id.
+ if (ClassMayResolveId(cx->names(), obj->getClass(), id, obj))
+ return false;
+ } else if (obj->is<UnboxedPlainObject>()) {
+ if (obj->as<UnboxedPlainObject>().containsUnboxedOrExpandoProperty(cx, id)) {
+ MarkNonNativePropertyFound<NoGC>(propp);
+ return true;
+ }
+ } else if (obj->is<UnboxedArrayObject>()) {
+ if (obj->as<UnboxedArrayObject>().containsProperty(cx, id)) {
+ MarkNonNativePropertyFound<NoGC>(propp);
+ return true;
+ }
+ } else if (obj->is<TypedObject>()) {
+ if (obj->as<TypedObject>().typeDescr().hasProperty(cx->names(), id)) {
+ MarkNonNativePropertyFound<NoGC>(propp);
+ return true;
+ }
+ } else {
+ return false;
+ }
+
+ *propp = nullptr;
+ return true;
+}
+
+static inline bool
+NativeGetPureInline(NativeObject* pobj, Shape* shape, Value* vp)
+{
+ /* Fail if we have a custom getter. */
+ if (!shape->hasDefaultGetter())
+ return false;
+
+ if (shape->hasSlot()) {
+ *vp = pobj->getSlot(shape->slot());
+ MOZ_ASSERT(!vp->isMagic());
+ } else {
+ vp->setUndefined();
+ }
+
+ return true;
+}
+
+bool
+js::GetPropertyPure(ExclusiveContext* cx, JSObject* obj, jsid id, Value* vp)
+{
+ JSObject* pobj;
+ Shape* shape;
+ if (!LookupPropertyPure(cx, obj, id, &pobj, &shape))
+ return false;
+
+ if (!shape) {
+ vp->setUndefined();
+ return true;
+ }
+
+ return pobj->isNative() && NativeGetPureInline(&pobj->as<NativeObject>(), shape, vp);
+}
+
+static inline bool
+NativeGetGetterPureInline(Shape* shape, JSFunction** fp)
+{
+ if (shape->hasGetterObject()) {
+ if (shape->getterObject()->is<JSFunction>()) {
+ *fp = &shape->getterObject()->as<JSFunction>();
+ return true;
+ }
+ }
+
+ *fp = nullptr;
+ return true;
+}
+
+bool
+js::GetGetterPure(ExclusiveContext* cx, JSObject* obj, jsid id, JSFunction** fp)
+{
+ /* Just like GetPropertyPure, but get getter function, without invoking
+ * it. */
+ JSObject* pobj;
+ Shape* shape;
+ if (!LookupPropertyPure(cx, obj, id, &pobj, &shape))
+ return false;
+
+ if (!shape) {
+ *fp = nullptr;
+ return true;
+ }
+
+ return pobj->isNative() && NativeGetGetterPureInline(shape, fp);
+}
+
+bool
+js::GetOwnGetterPure(ExclusiveContext* cx, JSObject* obj, jsid id, JSFunction** fp)
+{
+ JS::AutoCheckCannotGC nogc;
+ Shape* shape;
+ if (!LookupOwnPropertyPure(cx, obj, id, &shape))
+ return false;
+
+ if (!shape) {
+ *fp = nullptr;
+ return true;
+ }
+
+ return NativeGetGetterPureInline(shape, fp);
+}
+
+bool
+js::GetOwnNativeGetterPure(JSContext* cx, JSObject* obj, jsid id, JSNative* native)
+{
+ JS::AutoCheckCannotGC nogc;
+ *native = nullptr;
+ Shape* shape;
+ if (!LookupOwnPropertyPure(cx, obj, id, &shape))
+ return false;
+
+ if (!shape || IsImplicitDenseOrTypedArrayElement(shape) || !shape->hasGetterObject())
+ return true;
+
+ JSObject* getterObj = shape->getterObject();
+ if (!getterObj->is<JSFunction>())
+ return true;
+
+ JSFunction* getter = &getterObj->as<JSFunction>();
+ if (!getter->isNative())
+ return true;
+
+ *native = getter->native();
+ return true;
+}
+
+bool
+js::HasOwnDataPropertyPure(JSContext* cx, JSObject* obj, jsid id, bool* result)
+{
+ Shape* shape = nullptr;
+ if (!LookupOwnPropertyPure(cx, obj, id, &shape))
+ return false;
+
+ *result = shape && !IsImplicitDenseOrTypedArrayElement(shape) && shape->hasDefaultGetter() &&
+ shape->hasSlot();
+ return true;
+}
+
+bool
+JSObject::reportReadOnly(JSContext* cx, jsid id, unsigned report)
+{
+ RootedValue val(cx, IdToValue(id));
+ return ReportValueErrorFlags(cx, report, JSMSG_READ_ONLY,
+ JSDVG_IGNORE_STACK, val, nullptr,
+ nullptr, nullptr);
+}
+
+bool
+JSObject::reportNotConfigurable(JSContext* cx, jsid id, unsigned report)
+{
+ RootedValue val(cx, IdToValue(id));
+ return ReportValueErrorFlags(cx, report, JSMSG_CANT_DELETE,
+ JSDVG_IGNORE_STACK, val, nullptr,
+ nullptr, nullptr);
+}
+
+bool
+JSObject::reportNotExtensible(JSContext* cx, unsigned report)
+{
+ RootedValue val(cx, ObjectValue(*this));
+ return ReportValueErrorFlags(cx, report, JSMSG_OBJECT_NOT_EXTENSIBLE,
+ JSDVG_IGNORE_STACK, val, nullptr,
+ nullptr, nullptr);
+}
+
+bool
+js::GetPrototypeIfOrdinary(JSContext* cx, HandleObject obj, bool* isOrdinary,
+ MutableHandleObject protop)
+{
+ if (obj->is<js::ProxyObject>())
+ return js::Proxy::getPrototypeIfOrdinary(cx, obj, isOrdinary, protop);
+
+ *isOrdinary = true;
+ protop.set(obj->staticPrototype());
+ return true;
+}
+
+/*** ES6 standard internal methods ***************************************************************/
+
+bool
+js::SetPrototype(JSContext* cx, HandleObject obj, HandleObject proto, JS::ObjectOpResult& result)
+{
+ // The proxy trap subsystem fully handles prototype-setting for proxies
+ // with dynamic [[Prototype]]s.
+ if (obj->hasDynamicPrototype()) {
+ MOZ_ASSERT(obj->is<ProxyObject>());
+ return Proxy::setPrototype(cx, obj, proto, result);
+ }
+
+ /*
+ * ES6 9.1.2 step 3-4 if |obj.[[Prototype]]| has SameValue as |proto| return true.
+ * Since the values in question are objects, we can just compare pointers.
+ */
+ if (proto == obj->staticPrototype())
+ return result.succeed();
+
+ /* Disallow mutation of immutable [[Prototype]]s. */
+ if (obj->staticPrototypeIsImmutable())
+ return result.fail(JSMSG_CANT_SET_PROTO);
+
+ /*
+ * Disallow mutating the [[Prototype]] on ArrayBuffer objects, which
+ * due to their complicated delegate-object shenanigans can't easily
+ * have a mutable [[Prototype]].
+ */
+ if (obj->is<ArrayBufferObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_SET_PROTO_OF,
+ "incompatible ArrayBuffer");
+ return false;
+ }
+
+ /*
+ * Disallow mutating the [[Prototype]] on Typed Objects, per the spec.
+ */
+ if (obj->is<TypedObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_SET_PROTO_OF,
+ "incompatible TypedObject");
+ return false;
+ }
+
+ /* ES6 9.1.2 step 5 forbids changing [[Prototype]] if not [[Extensible]]. */
+ bool extensible;
+ if (!IsExtensible(cx, obj, &extensible))
+ return false;
+ if (!extensible)
+ return result.fail(JSMSG_CANT_SET_PROTO);
+
+ // If this is a global object, resolve the Object class so that its
+ // [[Prototype]] chain is always properly immutable, even in the presence
+ // of lazy standard classes.
+ if (obj->is<GlobalObject>()) {
+ Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
+ if (!GlobalObject::ensureConstructor(cx, global, JSProto_Object))
+ return false;
+ }
+
+ /*
+ * ES6 9.1.2 step 6 forbids generating cyclical prototype chains. But we
+ * have to do this comparison on the observable WindowProxy, not on the
+ * possibly-Window object we're setting the proto on.
+ */
+ RootedObject objMaybeWindowProxy(cx, ToWindowProxyIfWindow(obj));
+ RootedObject obj2(cx, proto);
+ while (obj2) {
+ MOZ_ASSERT(!IsWindow(obj2));
+ if (obj2 == objMaybeWindowProxy)
+ return result.fail(JSMSG_CANT_SET_PROTO_CYCLE);
+
+ bool isOrdinary;
+ if (!GetPrototypeIfOrdinary(cx, obj2, &isOrdinary, &obj2))
+ return false;
+ if (!isOrdinary)
+ break;
+ }
+
+ // Convert unboxed objects to their native representations before changing
+ // their prototype/group, as they depend on the group for their layout.
+ if (!MaybeConvertUnboxedObjectToNative(cx, obj))
+ return false;
+
+ Rooted<TaggedProto> taggedProto(cx, TaggedProto(proto));
+ if (!SetClassAndProto(cx, obj, obj->getClass(), taggedProto))
+ return false;
+
+ return result.succeed();
+}
+
+bool
+js::SetPrototype(JSContext* cx, HandleObject obj, HandleObject proto)
+{
+ ObjectOpResult result;
+ return SetPrototype(cx, obj, proto, result) && result.checkStrict(cx, obj);
+}
+
+bool
+js::PreventExtensions(JSContext* cx, HandleObject obj, ObjectOpResult& result, IntegrityLevel level)
+{
+ if (obj->is<ProxyObject>())
+ return js::Proxy::preventExtensions(cx, obj, result);
+
+ if (!obj->nonProxyIsExtensible())
+ return result.succeed();
+
+ if (!MaybeConvertUnboxedObjectToNative(cx, obj))
+ return false;
+
+ // Force lazy properties to be resolved.
+ AutoIdVector props(cx);
+ if (!js::GetPropertyKeys(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY, &props))
+ return false;
+
+ // Actually prevent extension. If the object is being frozen, do it by
+ // setting the frozen flag on both the object and the object group.
+ // Otherwise, fallback to sparsifying the object, which makes sure no
+ // element can be added without a call to isExtensible, at the cost of
+ // performance.
+ if (obj->isNative()) {
+ if (level == IntegrityLevel::Frozen) {
+ MarkObjectGroupFlags(cx, obj, OBJECT_FLAG_FROZEN);
+ if (!ObjectElements::FreezeElements(cx, obj.as<NativeObject>()))
+ return false;
+ } else if (!NativeObject::sparsifyDenseElements(cx, obj.as<NativeObject>())) {
+ return false;
+ }
+ }
+
+ if (!obj->setFlags(cx, BaseShape::NOT_EXTENSIBLE, JSObject::GENERATE_SHAPE)) {
+ // We failed to mark the object non-extensible, so reset the frozen
+ // flag on the elements.
+ MOZ_ASSERT(obj->nonProxyIsExtensible());
+ if (obj->isNative() && obj->as<NativeObject>().getElementsHeader()->isFrozen())
+ obj->as<NativeObject>().getElementsHeader()->markNotFrozen();
+ return false;
+ }
+
+ return result.succeed();
+}
+
+bool
+js::PreventExtensions(JSContext* cx, HandleObject obj, IntegrityLevel level)
+{
+ ObjectOpResult result;
+ return PreventExtensions(cx, obj, result, level) && result.checkStrict(cx, obj);
+}
+
+bool
+js::GetOwnPropertyDescriptor(JSContext* cx, HandleObject obj, HandleId id,
+ MutableHandle<PropertyDescriptor> desc)
+{
+ if (GetOwnPropertyOp op = obj->getOpsGetOwnPropertyDescriptor()) {
+ bool ok = op(cx, obj, id, desc);
+ if (ok)
+ desc.assertCompleteIfFound();
+ return ok;
+ }
+
+ return NativeGetOwnPropertyDescriptor(cx, obj.as<NativeObject>(), id, desc);
+}
+
+bool
+js::DefineProperty(JSContext* cx, HandleObject obj, HandleId id, Handle<PropertyDescriptor> desc)
+{
+ ObjectOpResult result;
+ return DefineProperty(cx, obj, id, desc, result) &&
+ result.checkStrict(cx, obj, id);
+}
+
+bool
+js::DefineProperty(JSContext* cx, HandleObject obj, HandleId id, Handle<PropertyDescriptor> desc,
+ ObjectOpResult& result)
+{
+ desc.assertValid();
+ if (DefinePropertyOp op = obj->getOpsDefineProperty())
+ return op(cx, obj, id, desc, result);
+ return NativeDefineProperty(cx, obj.as<NativeObject>(), id, desc, result);
+}
+
+bool
+js::DefineProperty(ExclusiveContext* cx, HandleObject obj, HandleId id, HandleValue value,
+ JSGetterOp getter, JSSetterOp setter, unsigned attrs,
+ ObjectOpResult& result)
+{
+ MOZ_ASSERT(!(attrs & JSPROP_PROPOP_ACCESSORS));
+
+ Rooted<PropertyDescriptor> desc(cx);
+ desc.initFields(nullptr, value, attrs, getter, setter);
+ if (DefinePropertyOp op = obj->getOpsDefineProperty()) {
+ if (!cx->shouldBeJSContext())
+ return false;
+ return op(cx->asJSContext(), obj, id, desc, result);
+ }
+ return NativeDefineProperty(cx, obj.as<NativeObject>(), id, desc, result);
+}
+
+bool
+js::DefineProperty(ExclusiveContext* cx, HandleObject obj, PropertyName* name, HandleValue value,
+ JSGetterOp getter, JSSetterOp setter, unsigned attrs,
+ ObjectOpResult& result)
+{
+ RootedId id(cx, NameToId(name));
+ return DefineProperty(cx, obj, id, value, getter, setter, attrs, result);
+}
+
+bool
+js::DefineElement(ExclusiveContext* cx, HandleObject obj, uint32_t index, HandleValue value,
+ JSGetterOp getter, JSSetterOp setter, unsigned attrs,
+ ObjectOpResult& result)
+{
+ MOZ_ASSERT(getter != JS_PropertyStub);
+ MOZ_ASSERT(setter != JS_StrictPropertyStub);
+
+ RootedId id(cx);
+ if (!IndexToId(cx, index, &id))
+ return false;
+ return DefineProperty(cx, obj, id, value, getter, setter, attrs, result);
+}
+
+bool
+js::DefineProperty(ExclusiveContext* cx, HandleObject obj, HandleId id, HandleValue value,
+ JSGetterOp getter, JSSetterOp setter, unsigned attrs)
+{
+ ObjectOpResult result;
+ if (!DefineProperty(cx, obj, id, value, getter, setter, attrs, result))
+ return false;
+ if (!result) {
+ if (!cx->shouldBeJSContext())
+ return false;
+ result.reportError(cx->asJSContext(), obj, id);
+ return false;
+ }
+ return true;
+}
+
+bool
+js::DefineProperty(ExclusiveContext* cx, HandleObject obj, PropertyName* name, HandleValue value,
+ JSGetterOp getter, JSSetterOp setter, unsigned attrs)
+{
+ RootedId id(cx, NameToId(name));
+ return DefineProperty(cx, obj, id, value, getter, setter, attrs);
+}
+
+bool
+js::DefineElement(ExclusiveContext* cx, HandleObject obj, uint32_t index, HandleValue value,
+ JSGetterOp getter, JSSetterOp setter, unsigned attrs)
+{
+ MOZ_ASSERT(getter != JS_PropertyStub);
+ MOZ_ASSERT(setter != JS_StrictPropertyStub);
+
+ RootedId id(cx);
+ if (!IndexToId(cx, index, &id))
+ return false;
+ return DefineProperty(cx, obj, id, value, getter, setter, attrs);
+}
+
+
+/*** SpiderMonkey nonstandard internal methods ***************************************************/
+
+bool
+js::SetImmutablePrototype(ExclusiveContext* cx, HandleObject obj, bool* succeeded)
+{
+ if (obj->hasDynamicPrototype()) {
+ if (!cx->shouldBeJSContext())
+ return false;
+ return Proxy::setImmutablePrototype(cx->asJSContext(), obj, succeeded);
+ }
+
+ if (!obj->setFlags(cx, BaseShape::IMMUTABLE_PROTOTYPE))
+ return false;
+ *succeeded = true;
+ return true;
+}
+
+bool
+js::GetPropertyDescriptor(JSContext* cx, HandleObject obj, HandleId id,
+ MutableHandle<PropertyDescriptor> desc)
+{
+ RootedObject pobj(cx);
+
+ for (pobj = obj; pobj;) {
+ if (pobj->is<ProxyObject>()) {
+ bool ok = Proxy::getPropertyDescriptor(cx, pobj, id, desc);
+ if (ok)
+ desc.assertCompleteIfFound();
+ return ok;
+ }
+
+ if (!GetOwnPropertyDescriptor(cx, pobj, id, desc))
+ return false;
+
+ if (desc.object())
+ return true;
+
+ if (!GetPrototype(cx, pobj, &pobj))
+ return false;
+ }
+
+ MOZ_ASSERT(!desc.object());
+ return true;
+}
+
+bool
+js::WatchGuts(JSContext* cx, JS::HandleObject origObj, JS::HandleId id, JS::HandleObject callable)
+{
+ RootedObject obj(cx, ToWindowIfWindowProxy(origObj));
+ if (obj->isNative()) {
+ // Use sparse indexes for watched objects, as dense elements can be
+ // written to without checking the watchpoint map.
+ if (!NativeObject::sparsifyDenseElements(cx, obj.as<NativeObject>()))
+ return false;
+
+ MarkTypePropertyNonData(cx, obj, id);
+ }
+
+ WatchpointMap* wpmap = cx->compartment()->watchpointMap;
+ if (!wpmap) {
+ wpmap = cx->runtime()->new_<WatchpointMap>();
+ if (!wpmap || !wpmap->init()) {
+ ReportOutOfMemory(cx);
+ js_delete(wpmap);
+ return false;
+ }
+ cx->compartment()->watchpointMap = wpmap;
+ }
+
+ return wpmap->watch(cx, obj, id, js::WatchHandler, callable);
+}
+
+bool
+js::UnwatchGuts(JSContext* cx, JS::HandleObject origObj, JS::HandleId id)
+{
+ // Looking in the map for an unsupported object will never hit, so we don't
+ // need to check for nativeness or watchable-ness here.
+ RootedObject obj(cx, ToWindowIfWindowProxy(origObj));
+ if (WatchpointMap* wpmap = cx->compartment()->watchpointMap)
+ wpmap->unwatch(obj, id, nullptr, nullptr);
+ return true;
+}
+
+bool
+js::WatchProperty(JSContext* cx, HandleObject obj, HandleId id, HandleObject callable)
+{
+ if (WatchOp op = obj->getOpsWatch())
+ return op(cx, obj, id, callable);
+
+ if (!obj->isNative() || obj->is<TypedArrayObject>()) {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_WATCH,
+ obj->getClass()->name);
+ return false;
+ }
+
+ return WatchGuts(cx, obj, id, callable);
+}
+
+bool
+js::UnwatchProperty(JSContext* cx, HandleObject obj, HandleId id)
+{
+ if (UnwatchOp op = obj->getOpsUnwatch())
+ return op(cx, obj, id);
+
+ return UnwatchGuts(cx, obj, id);
+}
+
+const char*
+js::GetObjectClassName(JSContext* cx, HandleObject obj)
+{
+ assertSameCompartment(cx, obj);
+
+ if (obj->is<ProxyObject>())
+ return Proxy::className(cx, obj);
+
+ return obj->getClass()->name;
+}
+
+
+/* * */
+
+bool
+js::HasDataProperty(JSContext* cx, NativeObject* obj, jsid id, Value* vp)
+{
+ if (JSID_IS_INT(id) && obj->containsDenseElement(JSID_TO_INT(id))) {
+ *vp = obj->getDenseElement(JSID_TO_INT(id));
+ return true;
+ }
+
+ if (Shape* shape = obj->lookup(cx, id)) {
+ if (shape->hasDefaultGetter() && shape->hasSlot()) {
+ *vp = obj->getSlot(shape->slot());
+ return true;
+ }
+ }
+
+ return false;
+}
+
+extern bool
+PropertySpecNameToId(JSContext* cx, const char* name, MutableHandleId id,
+ js::PinningBehavior pin = js::DoNotPinAtom);
+
+static bool
+DefineFunctionFromSpec(JSContext* cx, HandleObject obj, const JSFunctionSpec* fs, unsigned flags,
+ DefineAsIntrinsic intrinsic)
+{
+ GetterOp gop;
+ SetterOp sop;
+ if (flags & JSFUN_STUB_GSOPS) {
+ // JSFUN_STUB_GSOPS is a request flag only, not stored in fun->flags or
+ // the defined property's attributes.
+ flags &= ~JSFUN_STUB_GSOPS;
+ gop = nullptr;
+ sop = nullptr;
+ } else {
+ gop = obj->getClass()->getGetProperty();
+ sop = obj->getClass()->getSetProperty();
+ MOZ_ASSERT(gop != JS_PropertyStub);
+ MOZ_ASSERT(sop != JS_StrictPropertyStub);
+ }
+
+ RootedId id(cx);
+ if (!PropertySpecNameToId(cx, fs->name, &id))
+ return false;
+
+ JSFunction* fun = NewFunctionFromSpec(cx, fs, id);
+ if (!fun)
+ return false;
+
+ if (intrinsic == AsIntrinsic)
+ fun->setIsIntrinsic();
+
+ RootedValue funVal(cx, ObjectValue(*fun));
+ return DefineProperty(cx, obj, id, funVal, gop, sop, flags & ~JSFUN_FLAGS_MASK);
+}
+
+bool
+js::DefineFunctions(JSContext* cx, HandleObject obj, const JSFunctionSpec* fs,
+ DefineAsIntrinsic intrinsic)
+{
+ for (; fs->name; fs++) {
+ if (!DefineFunctionFromSpec(cx, obj, fs, fs->flags, intrinsic))
+ return false;
+ }
+ return true;
+}
+
+
+/*** ToPrimitive *************************************************************/
+
+/*
+ * Gets |obj[id]|. If that value's not callable, returns true and stores an
+ * object value in *vp. If it's callable, calls it with no arguments and |obj|
+ * as |this|, returning the result in *vp.
+ *
+ * This is a mini-abstraction for ES6 draft rev 36 (2015 Mar 17),
+ * 7.1.1, second algorithm (OrdinaryToPrimitive), steps 5.a-c.
+ */
+static bool
+MaybeCallMethod(JSContext* cx, HandleObject obj, HandleId id, MutableHandleValue vp)
+{
+ if (!GetProperty(cx, obj, obj, id, vp))
+ return false;
+ if (!IsCallable(vp)) {
+ vp.setObject(*obj);
+ return true;
+ }
+
+ return js::Call(cx, vp, obj, vp);
+}
+
+static bool
+ReportCantConvert(JSContext* cx, unsigned errorNumber, HandleObject obj, JSType hint)
+{
+ const Class* clasp = obj->getClass();
+
+ // Avoid recursive death when decompiling in ReportValueError.
+ RootedString str(cx);
+ if (hint == JSTYPE_STRING) {
+ str = JS_AtomizeAndPinString(cx, clasp->name);
+ if (!str)
+ return false;
+ } else {
+ str = nullptr;
+ }
+
+ RootedValue val(cx, ObjectValue(*obj));
+ ReportValueError2(cx, errorNumber, JSDVG_SEARCH_STACK, val, str,
+ hint == JSTYPE_VOID
+ ? "primitive type"
+ : hint == JSTYPE_STRING ? "string" : "number");
+ return false;
+}
+
+bool
+JS::OrdinaryToPrimitive(JSContext* cx, HandleObject obj, JSType hint, MutableHandleValue vp)
+{
+ MOZ_ASSERT(hint == JSTYPE_NUMBER || hint == JSTYPE_STRING || hint == JSTYPE_VOID);
+
+ Rooted<jsid> id(cx);
+
+ const Class* clasp = obj->getClass();
+ if (hint == JSTYPE_STRING) {
+ id = NameToId(cx->names().toString);
+
+ /* Optimize (new String(...)).toString(). */
+ if (clasp == &StringObject::class_) {
+ StringObject* nobj = &obj->as<StringObject>();
+ if (ClassMethodIsNative(cx, nobj, &StringObject::class_, id, str_toString)) {
+ vp.setString(nobj->unbox());
+ return true;
+ }
+ }
+
+ if (!MaybeCallMethod(cx, obj, id, vp))
+ return false;
+ if (vp.isPrimitive())
+ return true;
+
+ id = NameToId(cx->names().valueOf);
+ if (!MaybeCallMethod(cx, obj, id, vp))
+ return false;
+ if (vp.isPrimitive())
+ return true;
+ } else {
+ id = NameToId(cx->names().valueOf);
+
+ /* Optimize new String(...).valueOf(). */
+ if (clasp == &StringObject::class_) {
+ StringObject* nobj = &obj->as<StringObject>();
+ if (ClassMethodIsNative(cx, nobj, &StringObject::class_, id, str_toString)) {
+ vp.setString(nobj->unbox());
+ return true;
+ }
+ }
+
+ /* Optimize new Number(...).valueOf(). */
+ if (clasp == &NumberObject::class_) {
+ NumberObject* nobj = &obj->as<NumberObject>();
+ if (ClassMethodIsNative(cx, nobj, &NumberObject::class_, id, num_valueOf)) {
+ vp.setNumber(nobj->unbox());
+ return true;
+ }
+ }
+
+ if (!MaybeCallMethod(cx, obj, id, vp))
+ return false;
+ if (vp.isPrimitive())
+ return true;
+
+ id = NameToId(cx->names().toString);
+ if (!MaybeCallMethod(cx, obj, id, vp))
+ return false;
+ if (vp.isPrimitive())
+ return true;
+ }
+
+ return ReportCantConvert(cx, JSMSG_CANT_CONVERT_TO, obj, hint);
+}
+
+bool
+js::ToPrimitiveSlow(JSContext* cx, JSType preferredType, MutableHandleValue vp)
+{
+ // Step numbers refer to the first algorithm listed in ES6 draft rev 36
+ // (2015 Mar 17) 7.1.1 ToPrimitive.
+ MOZ_ASSERT(preferredType == JSTYPE_VOID ||
+ preferredType == JSTYPE_STRING ||
+ preferredType == JSTYPE_NUMBER);
+ RootedObject obj(cx, &vp.toObject());
+
+ // Steps 4-5.
+ RootedId id(cx, SYMBOL_TO_JSID(cx->wellKnownSymbols().toPrimitive));
+ RootedValue method(cx);
+ if (!GetProperty(cx, obj, obj, id, &method))
+ return false;
+
+ // Step 6.
+ if (!method.isUndefined()) {
+ // Step 6 of GetMethod. js::Call() below would do this check and throw a
+ // TypeError anyway, but this produces a better error message.
+ if (!IsCallable(method))
+ return ReportCantConvert(cx, JSMSG_TOPRIMITIVE_NOT_CALLABLE, obj, preferredType);
+
+ // Steps 1-3, 6.a-b.
+ RootedValue arg0(cx, StringValue(preferredType == JSTYPE_STRING
+ ? cx->names().string
+ : preferredType == JSTYPE_NUMBER
+ ? cx->names().number
+ : cx->names().default_));
+
+ if (!js::Call(cx, method, vp, arg0, vp))
+ return false;
+
+ // Steps 6.c-d.
+ if (vp.isObject())
+ return ReportCantConvert(cx, JSMSG_TOPRIMITIVE_RETURNED_OBJECT, obj, preferredType);
+ return true;
+ }
+
+ return OrdinaryToPrimitive(cx, obj, preferredType, vp);
+}
+
+
+/* * */
+
+bool
+js::IsDelegate(JSContext* cx, HandleObject obj, const js::Value& v, bool* result)
+{
+ if (v.isPrimitive()) {
+ *result = false;
+ return true;
+ }
+ return IsDelegateOfObject(cx, obj, &v.toObject(), result);
+}
+
+bool
+js::IsDelegateOfObject(JSContext* cx, HandleObject protoObj, JSObject* obj, bool* result)
+{
+ RootedObject obj2(cx, obj);
+ for (;;) {
+ if (!GetPrototype(cx, obj2, &obj2))
+ return false;
+ if (!obj2) {
+ *result = false;
+ return true;
+ }
+ if (obj2 == protoObj) {
+ *result = true;
+ return true;
+ }
+ }
+}
+
+JSObject*
+js::GetBuiltinPrototypePure(GlobalObject* global, JSProtoKey protoKey)
+{
+ MOZ_ASSERT(JSProto_Null <= protoKey);
+ MOZ_ASSERT(protoKey < JSProto_LIMIT);
+
+ if (protoKey != JSProto_Null) {
+ const Value& v = global->getPrototype(protoKey);
+ if (v.isObject())
+ return &v.toObject();
+ }
+
+ return nullptr;
+}
+
+JSObject*
+js::PrimitiveToObject(JSContext* cx, const Value& v)
+{
+ if (v.isString()) {
+ Rooted<JSString*> str(cx, v.toString());
+ return StringObject::create(cx, str);
+ }
+ if (v.isNumber())
+ return NumberObject::create(cx, v.toNumber());
+ if (v.isBoolean())
+ return BooleanObject::create(cx, v.toBoolean());
+ MOZ_ASSERT(v.isSymbol());
+ RootedSymbol symbol(cx, v.toSymbol());
+ return SymbolObject::create(cx, symbol);
+}
+
+/*
+ * Invokes the ES5 ToObject algorithm on vp, returning the result. If vp might
+ * already be an object, use ToObject. reportCantConvert controls how null and
+ * undefined errors are reported.
+ *
+ * Callers must handle the already-object case.
+ */
+JSObject*
+js::ToObjectSlow(JSContext* cx, JS::HandleValue val, bool reportScanStack)
+{
+ MOZ_ASSERT(!val.isMagic());
+ MOZ_ASSERT(!val.isObject());
+
+ if (val.isNullOrUndefined()) {
+ if (reportScanStack) {
+ ReportIsNullOrUndefined(cx, JSDVG_SEARCH_STACK, val, nullptr);
+ } else {
+ JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_CANT_CONVERT_TO,
+ val.isNull() ? "null" : "undefined", "object");
+ }
+ return nullptr;
+ }
+
+ return PrimitiveToObject(cx, val);
+}
+
+Value
+js::GetThisValue(JSObject* obj)
+{
+ if (obj->is<GlobalObject>())
+ return ObjectValue(*ToWindowProxyIfWindow(obj));
+
+ if (obj->is<LexicalEnvironmentObject>()) {
+ if (!obj->as<LexicalEnvironmentObject>().isExtensible())
+ return UndefinedValue();
+ return obj->as<LexicalEnvironmentObject>().thisValue();
+ }
+
+ if (obj->is<ModuleEnvironmentObject>())
+ return UndefinedValue();
+
+ if (obj->is<WithEnvironmentObject>())
+ return ObjectValue(*obj->as<WithEnvironmentObject>().withThis());
+
+ if (obj->is<NonSyntacticVariablesObject>())
+ return GetThisValue(obj->enclosingEnvironment());
+
+ return ObjectValue(*obj);
+}
+
+class GetObjectSlotNameFunctor : public JS::CallbackTracer::ContextFunctor
+{
+ JSObject* obj;
+
+ public:
+ explicit GetObjectSlotNameFunctor(JSObject* ctx) : obj(ctx) {}
+ virtual void operator()(JS::CallbackTracer* trc, char* buf, size_t bufsize) override;
+};
+
+void
+GetObjectSlotNameFunctor::operator()(JS::CallbackTracer* trc, char* buf, size_t bufsize)
+{
+ MOZ_ASSERT(trc->contextIndex() != JS::CallbackTracer::InvalidIndex);
+
+ uint32_t slot = uint32_t(trc->contextIndex());
+
+ Shape* shape;
+ if (obj->isNative()) {
+ shape = obj->as<NativeObject>().lastProperty();
+ while (shape && (!shape->hasSlot() || shape->slot() != slot))
+ shape = shape->previous();
+ } else {
+ shape = nullptr;
+ }
+
+ if (!shape) {
+ do {
+ const char* slotname = nullptr;
+ const char* pattern = nullptr;
+ if (obj->is<GlobalObject>()) {
+ pattern = "CLASS_OBJECT(%s)";
+ if (false)
+ ;
+#define TEST_SLOT_MATCHES_PROTOTYPE(name,code,init,clasp) \
+ else if ((code) == slot) { slotname = js_##name##_str; }
+ JS_FOR_EACH_PROTOTYPE(TEST_SLOT_MATCHES_PROTOTYPE)
+#undef TEST_SLOT_MATCHES_PROTOTYPE
+ } else {
+ pattern = "%s";
+ if (obj->is<EnvironmentObject>()) {
+ if (slot == EnvironmentObject::enclosingEnvironmentSlot()) {
+ slotname = "enclosing_environment";
+ } else if (obj->is<CallObject>()) {
+ if (slot == CallObject::calleeSlot())
+ slotname = "callee_slot";
+ } else if (obj->is<WithEnvironmentObject>()) {
+ if (slot == WithEnvironmentObject::objectSlot())
+ slotname = "with_object";
+ else if (slot == WithEnvironmentObject::thisSlot())
+ slotname = "with_this";
+ }
+ }
+ }
+
+ if (slotname)
+ snprintf(buf, bufsize, pattern, slotname);
+ else
+ snprintf(buf, bufsize, "**UNKNOWN SLOT %" PRIu32 "**", slot);
+ } while (false);
+ } else {
+ jsid propid = shape->propid();
+ if (JSID_IS_INT(propid)) {
+ snprintf(buf, bufsize, "%" PRId32, JSID_TO_INT(propid));
+ } else if (JSID_IS_ATOM(propid)) {
+ PutEscapedString(buf, bufsize, JSID_TO_ATOM(propid), 0);
+ } else if (JSID_IS_SYMBOL(propid)) {
+ snprintf(buf, bufsize, "**SYMBOL KEY**");
+ } else {
+ snprintf(buf, bufsize, "**FINALIZED ATOM KEY**");
+ }
+ }
+}
+
+bool
+js::ReportGetterOnlyAssignment(JSContext* cx, bool strict)
+{
+ return JS_ReportErrorFlagsAndNumberASCII(cx,
+ strict
+ ? JSREPORT_ERROR
+ : JSREPORT_WARNING | JSREPORT_STRICT,
+ GetErrorMessage, nullptr,
+ JSMSG_GETTER_ONLY);
+}
+
+
+/*** Debugging routines **************************************************************************/
+
+#ifdef DEBUG
+
+/*
+ * Routines to print out values during debugging. These are FRIEND_API to help
+ * the debugger find them and to support temporarily hacking js::Dump* calls
+ * into other code.
+ */
+
+static void
+dumpValue(const Value& v, FILE* fp)
+{
+ if (v.isNull())
+ fprintf(fp, "null");
+ else if (v.isUndefined())
+ fprintf(fp, "undefined");
+ else if (v.isInt32())
+ fprintf(fp, "%d", v.toInt32());
+ else if (v.isDouble())
+ fprintf(fp, "%g", v.toDouble());
+ else if (v.isString())
+ v.toString()->dump(fp);
+ else if (v.isSymbol())
+ v.toSymbol()->dump(fp);
+ else if (v.isObject() && v.toObject().is<JSFunction>()) {
+ JSFunction* fun = &v.toObject().as<JSFunction>();
+ if (fun->displayAtom()) {
+ fputs("<function ", fp);
+ FileEscapedString(fp, fun->displayAtom(), 0);
+ } else {
+ fputs("<unnamed function", fp);
+ }
+ if (fun->hasScript()) {
+ JSScript* script = fun->nonLazyScript();
+ fprintf(fp, " (%s:%" PRIuSIZE ")",
+ script->filename() ? script->filename() : "", script->lineno());
+ }
+ fprintf(fp, " at %p>", (void*) fun);
+ } else if (v.isObject()) {
+ JSObject* obj = &v.toObject();
+ const Class* clasp = obj->getClass();
+ fprintf(fp, "<%s%s at %p>",
+ clasp->name,
+ (clasp == &PlainObject::class_) ? "" : " object",
+ (void*) obj);
+ } else if (v.isBoolean()) {
+ if (v.toBoolean())
+ fprintf(fp, "true");
+ else
+ fprintf(fp, "false");
+ } else if (v.isMagic()) {
+ fprintf(fp, "<invalid");
+#ifdef DEBUG
+ switch (v.whyMagic()) {
+ case JS_ELEMENTS_HOLE: fprintf(fp, " elements hole"); break;
+ case JS_NO_ITER_VALUE: fprintf(fp, " no iter value"); break;
+ case JS_GENERATOR_CLOSING: fprintf(fp, " generator closing"); break;
+ case JS_OPTIMIZED_OUT: fprintf(fp, " optimized out"); break;
+ default: fprintf(fp, " ?!"); break;
+ }
+#endif
+ fprintf(fp, ">");
+ } else {
+ fprintf(fp, "unexpected value");
+ }
+}
+
+JS_FRIEND_API(void)
+js::DumpValue(const Value& val, FILE* fp)
+{
+ dumpValue(val, fp);
+ fputc('\n', fp);
+}
+
+JS_FRIEND_API(void)
+js::DumpId(jsid id, FILE* fp)
+{
+ fprintf(fp, "jsid %p = ", (void*) JSID_BITS(id));
+ dumpValue(IdToValue(id), fp);
+ fputc('\n', fp);
+}
+
+static void
+DumpProperty(const NativeObject* obj, Shape& shape, FILE* fp)
+{
+ jsid id = shape.propid();
+ uint8_t attrs = shape.attributes();
+
+ fprintf(fp, " ((js::Shape*) %p) ", (void*) &shape);
+ if (attrs & JSPROP_ENUMERATE) fprintf(fp, "enumerate ");
+ if (attrs & JSPROP_READONLY) fprintf(fp, "readonly ");
+ if (attrs & JSPROP_PERMANENT) fprintf(fp, "permanent ");
+ if (attrs & JSPROP_SHARED) fprintf(fp, "shared ");
+
+ if (shape.hasGetterValue())
+ fprintf(fp, "getterValue=%p ", (void*) shape.getterObject());
+ else if (!shape.hasDefaultGetter())
+ fprintf(fp, "getterOp=%p ", JS_FUNC_TO_DATA_PTR(void*, shape.getterOp()));
+
+ if (shape.hasSetterValue())
+ fprintf(fp, "setterValue=%p ", (void*) shape.setterObject());
+ else if (!shape.hasDefaultSetter())
+ fprintf(fp, "setterOp=%p ", JS_FUNC_TO_DATA_PTR(void*, shape.setterOp()));
+
+ if (JSID_IS_ATOM(id) || JSID_IS_INT(id) || JSID_IS_SYMBOL(id))
+ dumpValue(js::IdToValue(id), fp);
+ else
+ fprintf(fp, "unknown jsid %p", (void*) JSID_BITS(id));
+
+ uint32_t slot = shape.hasSlot() ? shape.maybeSlot() : SHAPE_INVALID_SLOT;
+ fprintf(fp, ": slot %d", slot);
+ if (shape.hasSlot()) {
+ fprintf(fp, " = ");
+ dumpValue(obj->getSlot(slot), fp);
+ } else if (slot != SHAPE_INVALID_SLOT) {
+ fprintf(fp, " (INVALID!)");
+ }
+ fprintf(fp, "\n");
+}
+
+bool
+JSObject::uninlinedIsProxy() const
+{
+ return is<ProxyObject>();
+}
+
+void
+JSObject::dump(FILE* fp) const
+{
+ const JSObject* obj = this;
+ JSObject* globalObj = &global();
+ fprintf(fp, "object %p from global %p [%s]\n", (void*) obj,
+ (void*) globalObj, globalObj->getClass()->name);
+ const Class* clasp = obj->getClass();
+ fprintf(fp, "class %p %s\n", (const void*)clasp, clasp->name);
+
+ if (obj->hasLazyGroup()) {
+ fprintf(fp, "lazy group\n");
+ } else {
+ const ObjectGroup* group = obj->group();
+ fprintf(fp, "group %p\n", (const void*)group);
+ }
+
+ fprintf(fp, "flags:");
+ if (obj->isDelegate()) fprintf(fp, " delegate");
+ if (!obj->is<ProxyObject>() && !obj->nonProxyIsExtensible()) fprintf(fp, " not_extensible");
+ if (obj->isIndexed()) fprintf(fp, " indexed");
+ if (obj->isBoundFunction()) fprintf(fp, " bound_function");
+ if (obj->isQualifiedVarObj()) fprintf(fp, " varobj");
+ if (obj->isUnqualifiedVarObj()) fprintf(fp, " unqualified_varobj");
+ if (obj->watched()) fprintf(fp, " watched");
+ if (obj->isIteratedSingleton()) fprintf(fp, " iterated_singleton");
+ if (obj->isNewGroupUnknown()) fprintf(fp, " new_type_unknown");
+ if (obj->hasUncacheableProto()) fprintf(fp, " has_uncacheable_proto");
+ if (obj->hadElementsAccess()) fprintf(fp, " had_elements_access");
+ if (obj->wasNewScriptCleared()) fprintf(fp, " new_script_cleared");
+ if (obj->hasStaticPrototype() && obj->staticPrototypeIsImmutable())
+ fprintf(fp, " immutable_prototype");
+
+ if (obj->isNative()) {
+ const NativeObject* nobj = &obj->as<NativeObject>();
+ if (nobj->inDictionaryMode())
+ fprintf(fp, " inDictionaryMode");
+ if (nobj->hasShapeTable())
+ fprintf(fp, " hasShapeTable");
+ }
+ fprintf(fp, "\n");
+
+ if (obj->isNative()) {
+ const NativeObject* nobj = &obj->as<NativeObject>();
+ uint32_t slots = nobj->getDenseInitializedLength();
+ if (slots) {
+ fprintf(fp, "elements\n");
+ for (uint32_t i = 0; i < slots; i++) {
+ fprintf(fp, " %3d: ", i);
+ dumpValue(nobj->getDenseElement(i), fp);
+ fprintf(fp, "\n");
+ fflush(fp);
+ }
+ }
+ }
+
+ fprintf(fp, "proto ");
+ TaggedProto proto = obj->taggedProto();
+ if (proto.isDynamic())
+ fprintf(fp, "<dynamic>");
+ else
+ dumpValue(ObjectOrNullValue(proto.toObjectOrNull()), fp);
+ fputc('\n', fp);
+
+ if (clasp->flags & JSCLASS_HAS_PRIVATE)
+ fprintf(fp, "private %p\n", obj->as<NativeObject>().getPrivate());
+
+ if (!obj->isNative())
+ fprintf(fp, "not native\n");
+
+ uint32_t reservedEnd = JSCLASS_RESERVED_SLOTS(clasp);
+ uint32_t slots = obj->isNative() ? obj->as<NativeObject>().slotSpan() : 0;
+ uint32_t stop = obj->isNative() ? reservedEnd : slots;
+ if (stop > 0)
+ fprintf(fp, obj->isNative() ? "reserved slots:\n" : "slots:\n");
+ for (uint32_t i = 0; i < stop; i++) {
+ fprintf(fp, " %3d ", i);
+ if (i < reservedEnd)
+ fprintf(fp, "(reserved) ");
+ fprintf(fp, "= ");
+ dumpValue(obj->as<NativeObject>().getSlot(i), fp);
+ fputc('\n', fp);
+ }
+
+ if (obj->isNative()) {
+ fprintf(fp, "properties:\n");
+ Vector<Shape*, 8, SystemAllocPolicy> props;
+ for (Shape::Range<NoGC> r(obj->as<NativeObject>().lastProperty()); !r.empty(); r.popFront()) {
+ if (!props.append(&r.front())) {
+ fprintf(fp, "(OOM while appending properties)\n");
+ break;
+ }
+ }
+ for (size_t i = props.length(); i-- != 0;)
+ DumpProperty(&obj->as<NativeObject>(), *props[i], fp);
+ }
+ fputc('\n', fp);
+}
+
+// For debuggers.
+void
+JSObject::dump() const
+{
+ dump(stderr);
+}
+
+static void
+MaybeDumpScope(Scope* scope, FILE* fp)
+{
+ if (scope) {
+ fprintf(fp, " scope: %s\n", ScopeKindString(scope->kind()));
+ for (BindingIter bi(scope); bi; bi++) {
+ fprintf(fp, " ");
+ dumpValue(StringValue(bi.name()), fp);
+ fputc('\n', fp);
+ }
+ }
+}
+
+static void
+MaybeDumpValue(const char* name, const Value& v, FILE* fp)
+{
+ if (!v.isNull()) {
+ fprintf(fp, " %s: ", name);
+ dumpValue(v, fp);
+ fputc('\n', fp);
+ }
+}
+
+JS_FRIEND_API(void)
+js::DumpInterpreterFrame(JSContext* cx, FILE* fp, InterpreterFrame* start)
+{
+ /* This should only called during live debugging. */
+ ScriptFrameIter i(cx);
+ if (!start) {
+ if (i.done()) {
+ fprintf(fp, "no stack for cx = %p\n", (void*) cx);
+ return;
+ }
+ } else {
+ while (!i.done() && !i.isJit() && i.interpFrame() != start)
+ ++i;
+
+ if (i.done()) {
+ fprintf(fp, "fp = %p not found in cx = %p\n",
+ (void*)start, (void*)cx);
+ return;
+ }
+ }
+
+ for (; !i.done(); ++i) {
+ if (i.isJit())
+ fprintf(fp, "JIT frame\n");
+ else
+ fprintf(fp, "InterpreterFrame at %p\n", (void*) i.interpFrame());
+
+ if (i.isFunctionFrame()) {
+ fprintf(fp, "callee fun: ");
+ RootedValue v(cx);
+ JSObject* fun = i.callee(cx);
+ v.setObject(*fun);
+ dumpValue(v, fp);
+ } else {
+ fprintf(fp, "global or eval frame, no callee");
+ }
+ fputc('\n', fp);
+
+ fprintf(fp, "file %s line %" PRIuSIZE "\n",
+ i.script()->filename(), i.script()->lineno());
+
+ if (jsbytecode* pc = i.pc()) {
+ fprintf(fp, " pc = %p\n", pc);
+ fprintf(fp, " current op: %s\n", CodeName[*pc]);
+ MaybeDumpScope(i.script()->lookupScope(pc), fp);
+ }
+ if (i.isFunctionFrame())
+ MaybeDumpValue("this", i.thisArgument(cx), fp);
+ if (!i.isJit()) {
+ fprintf(fp, " rval: ");
+ dumpValue(i.interpFrame()->returnValue(), fp);
+ fputc('\n', fp);
+ }
+
+ fprintf(fp, " flags:");
+ if (i.isConstructing())
+ fprintf(fp, " constructing");
+ if (!i.isJit() && i.interpFrame()->isDebuggerEvalFrame())
+ fprintf(fp, " debugger eval");
+ if (i.isEvalFrame())
+ fprintf(fp, " eval");
+ fputc('\n', fp);
+
+ fprintf(fp, " envChain: (JSObject*) %p\n", (void*) i.environmentChain(cx));
+
+ fputc('\n', fp);
+ }
+}
+
+#endif /* DEBUG */
+
+JS_FRIEND_API(void)
+js::DumpBacktrace(JSContext* cx, FILE* fp)
+{
+ Sprinter sprinter(cx, false);
+ if (!sprinter.init()) {
+ fprintf(fp, "js::DumpBacktrace: OOM\n");
+ return;
+ }
+ size_t depth = 0;
+ for (AllFramesIter i(cx); !i.done(); ++i, ++depth) {
+ const char* filename;
+ unsigned line;
+ if (i.hasScript()) {
+ filename = JS_GetScriptFilename(i.script());
+ line = PCToLineNumber(i.script(), i.pc());
+ } else {
+ filename = i.filename();
+ line = i.computeLine();
+ }
+ char frameType =
+ i.isInterp() ? 'i' :
+ i.isBaseline() ? 'b' :
+ i.isIon() ? 'I' :
+ i.isWasm() ? 'W' :
+ '?';
+
+ sprinter.printf("#%" PRIuSIZE " %14p %c %s:%d",
+ depth, i.rawFramePtr(), frameType, filename, line);
+
+ if (i.hasScript()) {
+ sprinter.printf(" (%p @ %" PRIuSIZE ")\n",
+ i.script(), i.script()->pcToOffset(i.pc()));
+ } else {
+ sprinter.printf(" (%p)\n", i.pc());
+ }
+ }
+ fprintf(fp, "%s", sprinter.string());
+#ifdef XP_WIN32
+ if (IsDebuggerPresent())
+ OutputDebugStringA(sprinter.string());
+#endif
+}
+
+JS_FRIEND_API(void)
+js::DumpBacktrace(JSContext* cx)
+{
+ DumpBacktrace(cx, stdout);
+}
+
+/* * */
+
+js::gc::AllocKind
+JSObject::allocKindForTenure(const js::Nursery& nursery) const
+{
+ if (is<ArrayObject>()) {
+ const ArrayObject& aobj = as<ArrayObject>();
+ MOZ_ASSERT(aobj.numFixedSlots() == 0);
+
+ /* Use minimal size object if we are just going to copy the pointer. */
+ if (!nursery.isInside(aobj.getElementsHeader()))
+ return AllocKind::OBJECT0_BACKGROUND;
+
+ size_t nelements = aobj.getDenseCapacity();
+ return GetBackgroundAllocKind(GetGCArrayKind(nelements));
+ }
+
+ if (is<JSFunction>())
+ return as<JSFunction>().getAllocKind();
+
+ /*
+ * Typed arrays in the nursery may have a lazily allocated buffer, make
+ * sure there is room for the array's fixed data when moving the array.
+ */
+ if (is<TypedArrayObject>() && !as<TypedArrayObject>().hasBuffer()) {
+ size_t nbytes = as<TypedArrayObject>().byteLength();
+ if (as<TypedArrayObject>().hasInlineElements())
+ return GetBackgroundAllocKind(TypedArrayObject::AllocKindForLazyBuffer(nbytes));
+ return GetGCObjectKind(getClass());
+ }
+
+ // Proxies that are CrossCompartmentWrappers may be nursery allocated.
+ if (IsProxy(this))
+ return as<ProxyObject>().allocKindForTenure();
+
+ // Unboxed plain objects are sized according to the data they store.
+ if (is<UnboxedPlainObject>()) {
+ size_t nbytes = as<UnboxedPlainObject>().layoutDontCheckGeneration().size();
+ return GetGCObjectKindForBytes(UnboxedPlainObject::offsetOfData() + nbytes);
+ }
+
+ // Unboxed arrays use inline data if their size is small enough.
+ if (is<UnboxedArrayObject>()) {
+ const UnboxedArrayObject* nobj = &as<UnboxedArrayObject>();
+ size_t nbytes = UnboxedArrayObject::offsetOfInlineElements() +
+ nobj->capacity() * nobj->elementSize();
+ if (nbytes <= JSObject::MAX_BYTE_SIZE)
+ return GetGCObjectKindForBytes(nbytes);
+ return AllocKind::OBJECT0;
+ }
+
+ // Inlined typed objects are followed by their data, so make sure we copy
+ // it all over to the new object.
+ if (is<InlineTypedObject>()) {
+ // Figure out the size of this object, from the prototype's TypeDescr.
+ // The objects we are traversing here are all tenured, so we don't need
+ // to check forwarding pointers.
+ TypeDescr& descr = as<InlineTypedObject>().typeDescr();
+ MOZ_ASSERT(!IsInsideNursery(&descr));
+ return InlineTypedObject::allocKindForTypeDescriptor(&descr);
+ }
+
+ // Outline typed objects use the minimum allocation kind.
+ if (is<OutlineTypedObject>())
+ return AllocKind::OBJECT0;
+
+ // All nursery allocatable non-native objects are handled above.
+ MOZ_ASSERT(isNative());
+
+ AllocKind kind = GetGCObjectFixedSlotsKind(as<NativeObject>().numFixedSlots());
+ MOZ_ASSERT(!IsBackgroundFinalized(kind));
+ if (!CanBeFinalizedInBackground(kind, getClass()))
+ return kind;
+ return GetBackgroundAllocKind(kind);
+}
+
+void
+JSObject::addSizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf, JS::ClassInfo* info)
+{
+ if (is<NativeObject>() && as<NativeObject>().hasDynamicSlots())
+ info->objectsMallocHeapSlots += mallocSizeOf(as<NativeObject>().slots_);
+
+ if (is<NativeObject>() && as<NativeObject>().hasDynamicElements()) {
+ js::ObjectElements* elements = as<NativeObject>().getElementsHeader();
+ if (!elements->isCopyOnWrite() || elements->ownerObject() == this)
+ info->objectsMallocHeapElementsNormal += mallocSizeOf(elements);
+ }
+
+ // Other things may be measured in the future if DMD indicates it is worthwhile.
+ if (is<JSFunction>() ||
+ is<PlainObject>() ||
+ is<ArrayObject>() ||
+ is<CallObject>() ||
+ is<RegExpObject>() ||
+ is<ProxyObject>())
+ {
+ // Do nothing. But this function is hot, and we win by getting the
+ // common cases out of the way early. Some stats on the most common
+ // classes, as measured during a vanilla browser session:
+ // - (53.7%, 53.7%): Function
+ // - (18.0%, 71.7%): Object
+ // - (16.9%, 88.6%): Array
+ // - ( 3.9%, 92.5%): Call
+ // - ( 2.8%, 95.3%): RegExp
+ // - ( 1.0%, 96.4%): Proxy
+
+ // Note that any JSClass that is special cased below likely needs to
+ // specify the JSCLASS_DELAY_METADATA_CALLBACK flag, or else we will
+ // probably crash if the object metadata callback attempts to get the
+ // size of the new object (which Debugger code does) before private
+ // slots are initialized.
+ } else if (is<ArgumentsObject>()) {
+ info->objectsMallocHeapMisc += as<ArgumentsObject>().sizeOfMisc(mallocSizeOf);
+ } else if (is<RegExpStaticsObject>()) {
+ info->objectsMallocHeapMisc += as<RegExpStaticsObject>().sizeOfData(mallocSizeOf);
+ } else if (is<PropertyIteratorObject>()) {
+ info->objectsMallocHeapMisc += as<PropertyIteratorObject>().sizeOfMisc(mallocSizeOf);
+ } else if (is<ArrayBufferObject>()) {
+ ArrayBufferObject::addSizeOfExcludingThis(this, mallocSizeOf, info);
+ } else if (is<SharedArrayBufferObject>()) {
+ SharedArrayBufferObject::addSizeOfExcludingThis(this, mallocSizeOf, info);
+#ifdef JS_HAS_CTYPES
+ } else {
+ // This must be the last case.
+ info->objectsMallocHeapMisc +=
+ js::SizeOfDataIfCDataObject(mallocSizeOf, const_cast<JSObject*>(this));
+#endif
+ }
+}
+
+size_t
+JSObject::sizeOfIncludingThisInNursery() const
+{
+ // This function doesn't concern itself yet with typed objects (bug 1133593)
+ // nor unboxed objects (bug 1133592).
+
+ MOZ_ASSERT(!isTenured());
+
+ const Nursery& nursery = compartment()->runtimeFromAnyThread()->gc.nursery;
+ size_t size = Arena::thingSize(allocKindForTenure(nursery));
+
+ if (is<NativeObject>()) {
+ const NativeObject& native = as<NativeObject>();
+
+ size += native.numFixedSlots() * sizeof(Value);
+ size += native.numDynamicSlots() * sizeof(Value);
+
+ if (native.hasDynamicElements()) {
+ js::ObjectElements& elements = *native.getElementsHeader();
+ if (!elements.isCopyOnWrite() || elements.ownerObject() == this)
+ size += elements.capacity * sizeof(HeapSlot);
+ }
+
+ if (is<ArgumentsObject>())
+ size += as<ArgumentsObject>().sizeOfData();
+ }
+
+ return size;
+}
+
+JS::ubi::Node::Size
+JS::ubi::Concrete<JSObject>::size(mozilla::MallocSizeOf mallocSizeOf) const
+{
+ JSObject& obj = get();
+
+ if (!obj.isTenured())
+ return obj.sizeOfIncludingThisInNursery();
+
+ JS::ClassInfo info;
+ obj.addSizeOfExcludingThis(mallocSizeOf, &info);
+ return obj.tenuredSizeOfThis() + info.sizeOfAllThings();
+}
+
+const char16_t JS::ubi::Concrete<JSObject>::concreteTypeName[] = u"JSObject";
+
+void
+JSObject::traceChildren(JSTracer* trc)
+{
+ TraceEdge(trc, &group_, "group");
+
+ if (is<ShapedObject>())
+ as<ShapedObject>().traceShape(trc);
+
+ const Class* clasp = group_->clasp();
+ if (clasp->isNative()) {
+ NativeObject* nobj = &as<NativeObject>();
+
+ {
+ GetObjectSlotNameFunctor func(nobj);
+ JS::AutoTracingDetails ctx(trc, func);
+ JS::AutoTracingIndex index(trc);
+ // Tracing can mutate the target but cannot change the slot count,
+ // but the compiler has no way of knowing this.
+ const uint32_t nslots = nobj->slotSpan();
+ for (uint32_t i = 0; i < nslots; ++i) {
+ TraceManuallyBarrieredEdge(trc, nobj->getSlotRef(i).unsafeUnbarrieredForTracing(),
+ "object slot");
+ ++index;
+ }
+ MOZ_ASSERT(nslots == nobj->slotSpan());
+ }
+
+ do {
+ if (nobj->denseElementsAreCopyOnWrite()) {
+ GCPtrNativeObject& owner = nobj->getElementsHeader()->ownerObject();
+ if (owner != nobj) {
+ TraceEdge(trc, &owner, "objectElementsOwner");
+ break;
+ }
+ }
+
+ TraceRange(trc,
+ nobj->getDenseInitializedLength(),
+ static_cast<HeapSlot*>(nobj->getDenseElementsAllowCopyOnWrite()),
+ "objectElements");
+ } while (false);
+ }
+
+ // Call the trace hook at the end so that during a moving GC the trace hook
+ // will see updated fields and slots.
+ if (clasp->hasTrace())
+ clasp->doTrace(trc, this);
+}
+
+static JSAtom*
+displayAtomFromObjectGroup(ObjectGroup& group)
+{
+ TypeNewScript* script = group.newScript();
+ if (!script)
+ return nullptr;
+
+ return script->function()->displayAtom();
+}
+
+bool
+JSObject::constructorDisplayAtom(JSContext* cx, js::MutableHandleAtom name)
+{
+ ObjectGroup *g = getGroup(cx);
+ if (!g)
+ return false;
+
+ name.set(displayAtomFromObjectGroup(*g));
+ return true;
+}
+
+JSAtom*
+JSObject::maybeConstructorDisplayAtom() const
+{
+ if (hasLazyGroup())
+ return nullptr;
+ return displayAtomFromObjectGroup(*group());
+}
+
+bool
+js::SpeciesConstructor(JSContext* cx, HandleObject obj, HandleValue defaultCtor, MutableHandleValue pctor)
+{
+ HandlePropertyName shName = cx->names().SpeciesConstructor;
+ RootedValue func(cx);
+ if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), shName, shName, 2, &func))
+ return false;
+
+ FixedInvokeArgs<2> args(cx);
+
+ args[0].setObject(*obj);
+ args[1].set(defaultCtor);
+
+ if (!Call(cx, func, UndefinedHandleValue, args, pctor))
+ return false;
+
+ pctor.set(args.rval());
+ return true;
+}
+
+bool
+js::SpeciesConstructor(JSContext* cx, HandleObject obj, JSProtoKey ctorKey,
+ MutableHandleValue pctor)
+{
+ if (!GlobalObject::ensureConstructor(cx, cx->global(), ctorKey))
+ return false;
+ RootedValue defaultCtor(cx, cx->global()->getConstructor(ctorKey));
+ return SpeciesConstructor(cx, obj, defaultCtor, pctor);
+}
+
+bool
+js::Unbox(JSContext* cx, HandleObject obj, MutableHandleValue vp)
+{
+ if (MOZ_UNLIKELY(obj->is<ProxyObject>()))
+ return Proxy::boxedValue_unbox(cx, obj, vp);
+
+ if (obj->is<BooleanObject>())
+ vp.setBoolean(obj->as<BooleanObject>().unbox());
+ else if (obj->is<NumberObject>())
+ vp.setNumber(obj->as<NumberObject>().unbox());
+ else if (obj->is<StringObject>())
+ vp.setString(obj->as<StringObject>().unbox());
+ else if (obj->is<DateObject>())
+ vp.set(obj->as<DateObject>().UTCTime());
+ else
+ vp.setUndefined();
+
+ return true;
+}