| /* -*- 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 "mozilla/UniquePtr.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 "asmjs/AsmJSModule.h" |
| #include "builtin/Eval.h" |
| #include "builtin/Object.h" |
| #include "builtin/SymbolObject.h" |
| #include "frontend/BytecodeCompiler.h" |
| #include "gc/Marking.h" |
| #include "jit/BaselineJIT.h" |
| #include "js/MemoryMetrics.h" |
| #include "js/Proxy.h" |
| #include "js/UbiNode.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/Interpreter-inl.h" |
| #include "vm/NativeObject-inl.h" |
| #include "vm/NumberObject-inl.h" |
| #include "vm/Runtime-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; |
| using mozilla::UniquePtr; |
| |
| void |
| js::ReportNotObject(JSContext* cx, const Value& v) |
| { |
| MOZ_ASSERT(!v.isObject()); |
| |
| RootedValue value(cx, v); |
| UniquePtr<char[], JS::FreePolicy> bytes = |
| DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, value, nullptr); |
| if (bytes) |
| JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT, bytes.get()); |
| } |
| |
| 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 |
| bool |
| js::FromPropertyDescriptor(JSContext* cx, Handle<PropertyDescriptor> desc, MutableHandleValue vp) |
| { |
| // 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_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_MORE_ARGS_NEEDED, |
| method, "0", "s"); |
| return false; |
| } |
| |
| HandleValue v = args[0]; |
| if (!v.isObject()) { |
| UniquePtr<char[], JS::FreePolicy> bytes = |
| DecompileValueGenerator(cx, JSDVG_SEARCH_STACK, v, nullptr); |
| if (!bytes) |
| return false; |
| JS_ReportErrorNumber(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_ReportErrorNumber(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_ReportErrorNumber(cx, GetErrorMessage, nullptr, errorNumber); |
| } |
| return false; |
| } |
| |
| |
| /*** PropertyDescriptor operations and DefineProperties ******************************************/ |
| |
| bool |
| CheckCallable(JSContext* cx, JSObject* obj, const char* fieldName) |
| { |
| if (obj && !obj->isCallable()) { |
| JS_ReportErrorNumber(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_ReportErrorNumber(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_ReportErrorNumber(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_ReportErrorNumber(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; |
| } |
| |
| bool |
| js::DefineProperties(JSContext* cx, HandleObject obj, HandleObject props) |
| { |
| AutoIdVector ids(cx); |
| Rooted<PropertyDescriptorVector> descs(cx, PropertyDescriptorVector(cx)); |
| if (!ReadPropertyDescriptors(cx, props, true, &ids, &descs)) |
| return false; |
| |
| for (size_t i = 0, len = ids.length(); i < len; i++) { |
| if (!DefineProperty(cx, obj, ids[i], descs[i])) |
| 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)) |
| return false; |
| |
| // Steps 6-7. |
| AutoIdVector keys(cx); |
| if (!GetPropertyKeys(cx, obj, JSITER_HIDDEN | JSITER_OWNONLY | JSITER_SYMBOLS, &keys)) |
| return false; |
| |
| // PreventExtensions must sparsify dense objects, so we can assign to holes |
| // without checks. |
| MOZ_ASSERT_IF(obj->isNative(), obj->as<NativeObject>().getDenseCapacity() == 0); |
| |
| // Steps 8-9, loosely interpreted. |
| if (obj->isNative() && !obj->as<NativeObject>().inDictionaryMode() && !IsAnyTypedArray(obj)) { |
| 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->getTaggedProto(), |
| 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->compartment()->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, ¤tDesc)) |
| 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->getTaggedProto() == 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(); |
| JSRuntime* rt = cx->runtime(); |
| NewObjectCache& cache = rt->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()->runtime()->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* cxArg, const Class* clasp, |
| HandleObject protoArg, |
| gc::AllocKind allocKind, NewObjectKind newKind) |
| { |
| if (protoArg) { |
| return NewObjectWithGivenTaggedProto(cxArg, clasp, AsTaggedProto(protoArg), |
| allocKind, newKind); |
| } |
| |
| if (CanBeFinalizedInBackground(allocKind, clasp)) |
| allocKind = GetBackgroundAllocKind(allocKind); |
| |
| Handle<GlobalObject*> global = cxArg->global(); |
| |
| bool isCachable = NewObjectIsCachable(cxArg, newKind, clasp); |
| if (isCachable) { |
| JSContext* cx = cxArg->asJSContext(); |
| JSRuntime* rt = cx->runtime(); |
| NewObjectCache& cache = rt->newObjectCache; |
| NewObjectCache::EntryIndex entry = -1; |
| if (cache.lookupGlobal(clasp, global, allocKind, &entry)) { |
| JSObject* obj = cache.newObjectFromHit(cx, entry, GetInitialHeap(newKind, clasp)); |
| 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(cxArg, protoArg); |
| if (!GetBuiltinPrototype(cxArg, protoKey, &proto)) |
| return nullptr; |
| |
| Rooted<TaggedProto> taggedProto(cxArg, TaggedProto(proto)); |
| RootedObjectGroup group(cxArg, ObjectGroup::defaultNewGroup(cxArg, clasp, taggedProto)); |
| if (!group) |
| return nullptr; |
| |
| JSObject* obj = NewObject(cxArg, group, allocKind, newKind); |
| if (!obj) |
| return nullptr; |
| |
| if (isCachable && !obj->as<NativeObject>().hasDynamicSlots()) { |
| NewObjectCache& cache = cxArg->asJSContext()->runtime()->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()->runtime()->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()->runtime()->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->getProto())); |
| 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, ®enerate)) |
| 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->getOps()->setProperty(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<JSPropertyDescriptor> 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 < 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_ReportErrorNumber(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_ReportErrorNumber(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, AutoValueVector& values) |
| { |
| MOZ_ASSERT(!obj->isSingleton()); |
| MOZ_ASSERT(obj->is<ArrayObject>() || obj->is<UnboxedArrayObject>()); |
| |
| size_t length = GetAnyBoxedOrUnboxedArrayLength(obj); |
| if (!values.appendN(MagicValue(JS_ELEMENTS_HOLE), length)) |
| return false; |
| |
| if (obj->nonProxyIsExtensible()) { |
| MOZ_ASSERT_IF(obj->is<ArrayObject>(), obj->as<ArrayObject>().slotSpan() == 0); |
| |
| size_t initlen = GetAnyBoxedOrUnboxedInitializedLength(obj); |
| for (size_t i = 0; i < initlen; i++) |
| values[i].set(GetAnyBoxedOrUnboxedDenseElement(obj, i)); |
| } else { |
| // Call site objects are frozen before they escape to script, which |
| // converts their dense elements into data properties. |
| ArrayObject* aobj = &obj->as<ArrayObject>(); |
| for (Shape::Range<NoGC> r(aobj->lastProperty()); !r.empty(); r.popFront()) { |
| Shape& shape = r.front(); |
| if (shape.propid() == NameToId(cx->names().length)) |
| continue; |
| MOZ_ASSERT(shape.isDataDescriptor()); |
| |
| // The 'raw' property is added before freezing call site objects. |
| // After an XDR or deep clone the script object will no longer be |
| // frozen, and the two objects will be connected again the first |
| // time the JSOP_CALLSITEOBJ executes. |
| if (shape.propid() == NameToId(cx->names().raw)) |
| continue; |
| |
| uint32_t index = JSID_TO_INT(shape.propid()); |
| values[index].set(aobj->getSlot(shape.slot())); |
| } |
| } |
| |
| 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(), |
| JS::CompartmentOptionsRef(cx).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>()) { |
| AutoValueVector values(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->getProto() == dst->getProto()) { |
| 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->getTaggedProto(), |
| 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->compartment()->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(), |
| JS::CompartmentOptionsRef(cx).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) { |
| AutoValueVector values(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(©OnWrite)) |
| 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)); |
| |
| if (key != JSProto_Null) { |
| /* |
| * Initializing an actual standard class on a global object. If the |
| * property is not yet present, force it into a new one bound to a |
| * reserved slot. Otherwise, go through the normal property path. |
| */ |
| Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>()); |
| |
| if (!global->lookup(cx, id)) { |
| global->setConstructorPropertySlot(key, v); |
| |
| uint32_t slot = GlobalObject::constructorPropertySlot(key); |
| if (!NativeObject::addProperty(cx, global, id, nullptr, nullptr, slot, attrs, 0)) |
| return false; |
| |
| named = true; |
| return true; |
| } |
| } |
| |
| 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->getProperty != JS_PropertyStub); |
| MOZ_ASSERT(clasp->setProperty != 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 = MaybeForwarded(obj.getElementsHeader()->ownerObject().get()); |
| 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()) { |
| 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->getProto(); |
| } |
| |
| 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->getTaggedProto()); |
| 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(); |
| } |
| |
| 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 (clasp->call) |
| return clasp->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 (clasp->construct) |
| return clasp->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->getOps()->lookupProperty) |
| 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 scopeChain, |
| MutableHandleObject objp, MutableHandleObject pobjp, MutableHandleShape propp) |
| { |
| RootedId id(cx, NameToId(name)); |
| |
| for (RootedObject scope(cx, scopeChain); scope; scope = scope->enclosingScope()) { |
| if (!LookupProperty(cx, scope, id, pobjp, propp)) |
| return false; |
| if (propp) { |
| objp.set(scope); |
| return true; |
| } |
| } |
| |
| objp.set(nullptr); |
| pobjp.set(nullptr); |
| propp.set(nullptr); |
| return true; |
| } |
| |
| bool |
| js::LookupNameNoGC(JSContext* cx, PropertyName* name, JSObject* scopeChain, |
| JSObject** objp, JSObject** pobjp, Shape** propp) |
| { |
| AutoAssertNoException nogc(cx); |
| |
| MOZ_ASSERT(!*objp && !*pobjp && !*propp); |
| |
| for (JSObject* scope = scopeChain; scope; scope = scope->enclosingScope()) { |
| if (scope->getOps()->lookupProperty) |
| return false; |
| if (!LookupPropertyInline<NoGC>(cx, &scope->as<NativeObject>(), NameToId(name), pobjp, propp)) |
| return false; |
| if (*propp) { |
| *objp = scope; |
| return true; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool |
| js::LookupNameWithGlobalDefault(JSContext* cx, HandlePropertyName name, HandleObject scopeChain, |
| MutableHandleObject objp) |
| { |
| RootedId id(cx, NameToId(name)); |
| |
| RootedObject pobj(cx); |
| RootedShape shape(cx); |
| |
| RootedObject scope(cx, scopeChain); |
| for (; !scope->is<GlobalObject>(); scope = scope->enclosingScope()) { |
| if (!LookupProperty(cx, scope, id, &pobj, &shape)) |
| return false; |
| if (shape) |
| break; |
| } |
| |
| objp.set(scope); |
| return true; |
| } |
| |
| bool |
| js::LookupNameUnqualified(JSContext* cx, HandlePropertyName name, HandleObject scopeChain, |
| MutableHandleObject objp) |
| { |
| RootedId id(cx, NameToId(name)); |
| |
| RootedObject pobj(cx); |
| RootedShape shape(cx); |
| |
| RootedObject scope(cx, scopeChain); |
| for (; !scope->isUnqualifiedVarObj(); scope = scope->enclosingScope()) { |
| if (!LookupProperty(cx, scope, id, &pobj, &shape)) |
| return false; |
| if (shape) |
| break; |
| } |
| |
| // See note above RuntimeLexicalErrorObject. |
| if (pobj == scope) { |
| if (name != cx->names().dotThis && IsUninitializedLexicalSlot(scope, shape)) { |
| scope = RuntimeLexicalErrorObject::create(cx, scope, JSMSG_UNINITIALIZED_LEXICAL); |
| if (!scope) |
| return false; |
| } else if (scope->is<ScopeObject>() && !scope->is<DeclEnvObject>() && !shape->writable()) { |
| MOZ_ASSERT(name != cx->names().dotThis); |
| scope = RuntimeLexicalErrorObject::create(cx, scope, JSMSG_BAD_CONST_ASSIGN); |
| if (!scope) |
| return false; |
| } |
| } |
| |
| objp.set(scope); |
| 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->getOps()->getOwnPropertyDescriptor) { |
| 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) |
| { |
| do { |
| 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))) { |
| *objp = obj; |
| MarkDenseOrTypedArrayElementFound<NoGC>(propp); |
| return true; |
| } |
| |
| if (IsAnyTypedArray(obj)) { |
| uint64_t index; |
| if (IsTypedArrayIndex(id, &index)) { |
| if (index < AnyTypedArrayLength(obj)) { |
| *objp = obj; |
| MarkDenseOrTypedArrayElementFound<NoGC>(propp); |
| } else { |
| *objp = nullptr; |
| *propp = nullptr; |
| } |
| return true; |
| } |
| } |
| |
| if (Shape* shape = obj->as<NativeObject>().lookupPure(id)) { |
| *objp = obj; |
| *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)) { |
| *objp = obj; |
| MarkNonNativePropertyFound<NoGC>(propp); |
| return true; |
| } |
| } else if (obj->is<UnboxedArrayObject>()) { |
| if (obj->as<UnboxedArrayObject>().containsProperty(cx, id)) { |
| *objp = obj; |
| MarkNonNativePropertyFound<NoGC>(propp); |
| return true; |
| } |
| } else if (obj->is<TypedObject>()) { |
| if (obj->as<TypedObject>().typeDescr().hasProperty(cx->names(), id)) { |
| *objp = obj; |
| MarkNonNativePropertyFound<NoGC>(propp); |
| return true; |
| } |
| } else { |
| return false; |
| } |
| |
| obj = obj->getProto(); |
| } while (obj); |
| |
| *objp = nullptr; |
| *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); |
| } |
| |
| 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); |
| } |
| |
| // Our immutable-prototype behavior is non-standard, and it's unclear whether |
| // it's shippable. (Or at least it's unclear whether it's shippable with any |
| // provided-by-default uses exposed to script.) If this bool is true, |
| // immutable-prototype behavior is enforced; if it's false, behavior is not |
| // enforced, and immutable-prototype bits stored on objects are completely |
| // ignored. |
| static const bool ImmutablePrototypesEnabled = true; |
| |
| JS_FRIEND_API(bool) |
| JS_ImmutablePrototypesEnabled() |
| { |
| return ImmutablePrototypesEnabled; |
| } |
| |
| /*** ES6 standard internal methods ***************************************************************/ |
| |
| bool |
| js::SetPrototype(JSContext* cx, HandleObject obj, HandleObject proto, JS::ObjectOpResult& result) |
| { |
| /* |
| * If |obj| has a "lazy" [[Prototype]], it is 1) a proxy 2) whose handler's |
| * {get,set}Prototype and setImmutablePrototype methods mediate access to |
| * |obj.[[Prototype]]|. The Proxy subsystem is responsible for responding |
| * to such attempts. |
| */ |
| if (obj->hasLazyPrototype()) { |
| MOZ_ASSERT(obj->is<ProxyObject>()); |
| return Proxy::setPrototype(cx, obj, proto, result); |
| } |
| |
| /* Disallow mutation of immutable [[Prototype]]s. */ |
| if (obj->nonLazyPrototypeIsImmutable() && ImmutablePrototypesEnabled) |
| 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_ReportErrorNumber(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_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_SET_PROTO_OF, |
| "incompatible TypedObject"); |
| return false; |
| } |
| |
| /* |
| * Explicitly disallow mutating the [[Prototype]] of Location objects |
| * for flash-related security reasons. |
| */ |
| if (!strcmp(obj->getClass()->name, "Location")) { |
| JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_CANT_SET_PROTO_OF, |
| "incompatible Location object"); |
| return false; |
| } |
| |
| /* |
| * 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->getProto()) |
| return result.succeed(); |
| |
| /* 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); |
| for (obj2 = proto; obj2; ) { |
| MOZ_ASSERT(!IsWindow(obj2)); |
| if (obj2 == objMaybeWindowProxy) |
| return result.fail(JSMSG_CANT_SET_PROTO_CYCLE); |
| |
| if (!GetPrototype(cx, obj2, &obj2)) |
| return false; |
| } |
| |
| // 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) |
| { |
| 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; |
| |
| // Convert all dense elements to sparse properties. This will shrink the |
| // initialized length and capacity of the object to zero and ensure that no |
| // new dense elements can be added without calling growElements(), which |
| // checks isExtensible(). |
| if (obj->isNative()) { |
| if (!NativeObject::sparsifyDenseElements(cx, obj.as<NativeObject>())) |
| return false; |
| } |
| |
| if (!obj->setFlags(cx, BaseShape::NOT_EXTENSIBLE, JSObject::GENERATE_SHAPE)) |
| return false; |
| return result.succeed(); |
| } |
| |
| bool |
| js::PreventExtensions(JSContext* cx, HandleObject obj) |
| { |
| ObjectOpResult result; |
| return PreventExtensions(cx, obj, result) && result.checkStrict(cx, obj); |
| } |
| |
| bool |
| js::GetOwnPropertyDescriptor(JSContext* cx, HandleObject obj, HandleId id, |
| MutableHandle<PropertyDescriptor> desc) |
| { |
| if (GetOwnPropertyOp op = obj->getOps()->getOwnPropertyDescriptor) { |
| bool ok = op(cx, obj, id, desc); |
| if (ok) |
| desc.assertCompleteIfFound(); |
| return ok; |
| } |
| |
| RootedNativeObject nobj(cx, obj.as<NativeObject>()); |
| RootedShape shape(cx); |
| if (!NativeLookupOwnProperty<CanGC>(cx, nobj, id, &shape)) |
| return false; |
| if (!shape) { |
| desc.object().set(nullptr); |
| return true; |
| } |
| |
| desc.setAttributes(GetShapeAttributes(obj, shape)); |
| if (desc.isAccessorDescriptor()) { |
| MOZ_ASSERT(desc.isShared()); |
| |
| // The result of GetOwnPropertyDescriptor() must be either undefined or |
| // a complete property descriptor (per ES6 draft rev 32 (2015 Feb 2) |
| // 6.1.7.3, Invariants of the Essential Internal Methods). |
| // |
| // It is an unfortunate fact that in SM, properties can exist that have |
| // JSPROP_GETTER or JSPROP_SETTER but not both. In these cases, rather |
| // than return true with desc incomplete, we fill out the missing |
| // getter or setter with a null, following CompletePropertyDescriptor. |
| if (desc.hasGetterObject()) { |
| desc.setGetterObject(shape->getterObject()); |
| } else { |
| desc.setGetterObject(nullptr); |
| desc.attributesRef() |= JSPROP_GETTER; |
| } |
| if (desc.hasSetterObject()) { |
| desc.setSetterObject(shape->setterObject()); |
| } else { |
| desc.setSetterObject(nullptr); |
| desc.attributesRef() |= JSPROP_SETTER; |
| } |
| |
| desc.value().setUndefined(); |
| } else { |
| // This is either a straight-up data property or (rarely) a |
| // property with a JSGetterOp/JSSetterOp. The latter must be |
| // reported to the caller as a plain data property, so clear |
| // desc.getter/setter, and mask away the SHARED bit. |
| desc.setGetter(nullptr); |
| desc.setSetter(nullptr); |
| desc.attributesRef() &= ~JSPROP_SHARED; |
| |
| if (IsImplicitDenseOrTypedArrayElement(shape)) { |
| desc.value().set(nobj->getDenseOrTypedArrayElement(JSID_TO_INT(id))); |
| } else { |
| if (!NativeGetExistingProperty(cx, nobj, nobj, shape, desc.value())) |
| return false; |
| } |
| } |
| |
| desc.object().set(nobj); |
| desc.assertComplete(); |
| return true; |
| } |
| |
| 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->getOps()->defineProperty) |
| 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->getOps()->defineProperty) { |
| 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->hasLazyPrototype()) { |
| 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->getOps()->watch) |
| return op(cx, obj, id, callable); |
| |
| if (!obj->isNative() || IsAnyTypedArray(obj)) { |
| JS_ReportErrorNumber(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->getOps()->unwatch) |
| 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 |
| JSObject::callMethod(JSContext* cx, HandleId id, unsigned argc, Value* argv, MutableHandleValue vp) |
| { |
| RootedValue fval(cx); |
| RootedObject obj(cx, this); |
| if (!GetProperty(cx, obj, obj, id, &fval)) |
| return false; |
| return Invoke(cx, ObjectValue(*obj), fval, argc, argv, vp); |
| } |
| |
| |
| /* * */ |
| |
| 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; |
| } |
| |
| |
| /*** 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 Invoke(cx, ObjectValue(*obj), vp, 0, nullptr, 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. Invoke() 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. |
| RootedValue hint(cx, StringValue(preferredType == JSTYPE_STRING ? cx->names().string : |
| preferredType == JSTYPE_NUMBER ? cx->names().number : |
| cx->names().default_)); |
| |
| // Steps 6.a-b. |
| if (!Invoke(cx, vp, method, 1, hint.address(), 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_ReportErrorNumber(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<ClonedBlockObject>()) |
| return obj->as<ClonedBlockObject>().thisValue(); |
| |
| if (obj->is<ModuleEnvironmentObject>()) |
| return UndefinedValue(); |
| |
| if (obj->is<DynamicWithObject>()) |
| return ObjectValue(*obj->as<DynamicWithObject>().withThis()); |
| |
| if (obj->is<NonSyntacticVariablesObject>()) |
| return GetThisValue(obj->enclosingScope()); |
| |
| 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<ScopeObject>()) { |
| if (slot == ScopeObject::enclosingScopeSlot()) { |
| slotname = "enclosing_environment"; |
| } else if (obj->is<CallObject>()) { |
| if (slot == CallObject::calleeSlot()) |
| slotname = "callee_slot"; |
| } else if (obj->is<DeclEnvObject>()) { |
| if (slot == DeclEnvObject::lambdaSlot()) |
| slotname = "named_lambda"; |
| } else if (obj->is<DynamicWithObject>()) { |
| if (slot == DynamicWithObject::objectSlot()) |
| slotname = "with_object"; |
| else if (slot == DynamicWithObject::thisSlot()) |
| slotname = "with_this"; |
| } |
| } |
| } |
| |
| if (slotname) |
| JS_snprintf(buf, bufsize, pattern, slotname); |
| else |
| JS_snprintf(buf, bufsize, "**UNKNOWN SLOT %ld**", (long)slot); |
| } while (false); |
| } else { |
| jsid propid = shape->propid(); |
| if (JSID_IS_INT(propid)) { |
| JS_snprintf(buf, bufsize, "%ld", (long)JSID_TO_INT(propid)); |
| } else if (JSID_IS_ATOM(propid)) { |
| PutEscapedString(buf, bufsize, JSID_TO_ATOM(propid), 0); |
| } else if (JSID_IS_SYMBOL(propid)) { |
| JS_snprintf(buf, bufsize, "**SYMBOL KEY**"); |
| } else { |
| JS_snprintf(buf, bufsize, "**FINALIZED ATOM KEY**"); |
| } |
| } |
| } |
| |
| bool |
| js::ReportGetterOnlyAssignment(JSContext* cx, bool strict) |
| { |
| return JS_ReportErrorFlagsAndNumber(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) |
| { |
| if (v.isNull()) |
| fprintf(stderr, "null"); |
| else if (v.isUndefined()) |
| fprintf(stderr, "undefined"); |
| else if (v.isInt32()) |
| fprintf(stderr, "%d", v.toInt32()); |
| else if (v.isDouble()) |
| fprintf(stderr, "%g", v.toDouble()); |
| else if (v.isString()) |
| v.toString()->dump(); |
| else if (v.isSymbol()) |
| v.toSymbol()->dump(); |
| else if (v.isObject() && v.toObject().is<JSFunction>()) { |
| JSFunction* fun = &v.toObject().as<JSFunction>(); |
| if (fun->displayAtom()) { |
| fputs("<function ", stderr); |
| FileEscapedString(stderr, fun->displayAtom(), 0); |
| } else { |
| fputs("<unnamed function", stderr); |
| } |
| if (fun->hasScript()) { |
| JSScript* script = fun->nonLazyScript(); |
| fprintf(stderr, " (%s:%" PRIuSIZE ")", |
| script->filename() ? script->filename() : "", script->lineno()); |
| } |
| fprintf(stderr, " at %p>", (void*) fun); |
| } else if (v.isObject()) { |
| JSObject* obj = &v.toObject(); |
| const Class* clasp = obj->getClass(); |
| fprintf(stderr, "<%s%s at %p>", |
| clasp->name, |
| (clasp == &PlainObject::class_) ? "" : " object", |
| (void*) obj); |
| } else if (v.isBoolean()) { |
| if (v.toBoolean()) |
| fprintf(stderr, "true"); |
| else |
| fprintf(stderr, "false"); |
| } else if (v.isMagic()) { |
| fprintf(stderr, "<invalid"); |
| #ifdef DEBUG |
| switch (v.whyMagic()) { |
| case JS_ELEMENTS_HOLE: fprintf(stderr, " elements hole"); break; |
| case JS_NO_ITER_VALUE: fprintf(stderr, " no iter value"); break; |
| case JS_GENERATOR_CLOSING: fprintf(stderr, " generator closing"); break; |
| case JS_OPTIMIZED_OUT: fprintf(stderr, " optimized out"); break; |
| default: fprintf(stderr, " ?!"); break; |
| } |
| #endif |
| fprintf(stderr, ">"); |
| } else { |
| fprintf(stderr, "unexpected value"); |
| } |
| } |
| |
| JS_FRIEND_API(void) |
| js::DumpValue(const Value& val) |
| { |
| dumpValue(val); |
| fputc('\n', stderr); |
| } |
| |
| JS_FRIEND_API(void) |
| js::DumpId(jsid id) |
| { |
| fprintf(stderr, "jsid %p = ", (void*) JSID_BITS(id)); |
| dumpValue(IdToValue(id)); |
| fputc('\n', stderr); |
| } |
| |
| static void |
| DumpProperty(NativeObject* obj, Shape& shape) |
| { |
| jsid id = shape.propid(); |
| uint8_t attrs = shape.attributes(); |
| |
| fprintf(stderr, " ((js::Shape*) %p) ", (void*) &shape); |
| if (attrs & JSPROP_ENUMERATE) fprintf(stderr, "enumerate "); |
| if (attrs & JSPROP_READONLY) fprintf(stderr, "readonly "); |
| if (attrs & JSPROP_PERMANENT) fprintf(stderr, "permanent "); |
| if (attrs & JSPROP_SHARED) fprintf(stderr, "shared "); |
| |
| if (shape.hasGetterValue()) |
| fprintf(stderr, "getterValue=%p ", (void*) shape.getterObject()); |
| else if (!shape.hasDefaultGetter()) |
| fprintf(stderr, "getterOp=%p ", JS_FUNC_TO_DATA_PTR(void*, shape.getterOp())); |
| |
| if (shape.hasSetterValue()) |
| fprintf(stderr, "setterValue=%p ", (void*) shape.setterObject()); |
| else if (!shape.hasDefaultSetter()) |
| fprintf(stderr, "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)); |
| else |
| fprintf(stderr, "unknown jsid %p", (void*) JSID_BITS(id)); |
| |
| uint32_t slot = shape.hasSlot() ? shape.maybeSlot() : SHAPE_INVALID_SLOT; |
| fprintf(stderr, ": slot %d", slot); |
| if (shape.hasSlot()) { |
| fprintf(stderr, " = "); |
| dumpValue(obj->getSlot(slot)); |
| } else if (slot != SHAPE_INVALID_SLOT) { |
| fprintf(stderr, " (INVALID!)"); |
| } |
| fprintf(stderr, "\n"); |
| } |
| |
| bool |
| JSObject::uninlinedIsProxy() const |
| { |
| return is<ProxyObject>(); |
| } |
| |
| void |
| JSObject::dump() |
| { |
| JSObject* obj = this; |
| JSObject* globalObj = &global(); |
| fprintf(stderr, "object %p from global %p [%s]\n", (void*) obj, |
| (void*) globalObj, globalObj->getClass()->name); |
| const Class* clasp = obj->getClass(); |
| fprintf(stderr, "class %p %s\n", (const void*)clasp, clasp->name); |
| |
| fprintf(stderr, "flags:"); |
| if (obj->isDelegate()) fprintf(stderr, " delegate"); |
| if (!obj->is<ProxyObject>() && !obj->nonProxyIsExtensible()) fprintf(stderr, " not_extensible"); |
| if (obj->isIndexed()) fprintf(stderr, " indexed"); |
| if (obj->isBoundFunction()) fprintf(stderr, " bound_function"); |
| if (obj->isQualifiedVarObj()) fprintf(stderr, " varobj"); |
| if (obj->isUnqualifiedVarObj()) fprintf(stderr, " unqualified_varobj"); |
| if (obj->watched()) fprintf(stderr, " watched"); |
| if (obj->isIteratedSingleton()) fprintf(stderr, " iterated_singleton"); |
| if (obj->isNewGroupUnknown()) fprintf(stderr, " new_type_unknown"); |
| if (obj->hasUncacheableProto()) fprintf(stderr, " has_uncacheable_proto"); |
| if (obj->hadElementsAccess()) fprintf(stderr, " had_elements_access"); |
| if (obj->wasNewScriptCleared()) fprintf(stderr, " new_script_cleared"); |
| if (!obj->hasLazyPrototype() && obj->nonLazyPrototypeIsImmutable()) fprintf(stderr, " immutable_prototype"); |
| |
| if (obj->isNative()) { |
| NativeObject* nobj = &obj->as<NativeObject>(); |
| if (nobj->inDictionaryMode()) |
| fprintf(stderr, " inDictionaryMode"); |
| if (nobj->hasShapeTable()) |
| fprintf(stderr, " hasShapeTable"); |
| } |
| fprintf(stderr, "\n"); |
| |
| if (obj->isNative()) { |
| NativeObject* nobj = &obj->as<NativeObject>(); |
| uint32_t slots = nobj->getDenseInitializedLength(); |
| if (slots) { |
| fprintf(stderr, "elements\n"); |
| for (uint32_t i = 0; i < slots; i++) { |
| fprintf(stderr, " %3d: ", i); |
| dumpValue(nobj->getDenseElement(i)); |
| fprintf(stderr, "\n"); |
| fflush(stderr); |
| } |
| } |
| } |
| |
| fprintf(stderr, "proto "); |
| TaggedProto proto = obj->getTaggedProto(); |
| if (proto.isLazy()) |
| fprintf(stderr, "<lazy>"); |
| else |
| dumpValue(ObjectOrNullValue(proto.toObjectOrNull())); |
| fputc('\n', stderr); |
| |
| if (clasp->flags & JSCLASS_HAS_PRIVATE) |
| fprintf(stderr, "private %p\n", obj->as<NativeObject>().getPrivate()); |
| |
| if (!obj->isNative()) |
| fprintf(stderr, "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(stderr, obj->isNative() ? "reserved slots:\n" : "slots:\n"); |
| for (uint32_t i = 0; i < stop; i++) { |
| fprintf(stderr, " %3d ", i); |
| if (i < reservedEnd) |
| fprintf(stderr, "(reserved) "); |
| fprintf(stderr, "= "); |
| dumpValue(obj->as<NativeObject>().getSlot(i)); |
| fputc('\n', stderr); |
| } |
| |
| if (obj->isNative()) { |
| fprintf(stderr, "properties:\n"); |
| Vector<Shape*, 8, SystemAllocPolicy> props; |
| for (Shape::Range<NoGC> r(obj->as<NativeObject>().lastProperty()); !r.empty(); r.popFront()) |
| props.append(&r.front()); |
| for (size_t i = props.length(); i-- != 0;) |
| DumpProperty(&obj->as<NativeObject>(), *props[i]); |
| } |
| fputc('\n', stderr); |
| } |
| |
| static void |
| MaybeDumpObject(const char* name, JSObject* obj) |
| { |
| if (obj) { |
| fprintf(stderr, " %s: ", name); |
| dumpValue(ObjectValue(*obj)); |
| fputc('\n', stderr); |
| } |
| } |
| |
| static void |
| MaybeDumpValue(const char* name, const Value& v) |
| { |
| if (!v.isNull()) { |
| fprintf(stderr, " %s: ", name); |
| dumpValue(v); |
| fputc('\n', stderr); |
| } |
| } |
| |
| JS_FRIEND_API(void) |
| js::DumpInterpreterFrame(JSContext* cx, InterpreterFrame* start) |
| { |
| /* This should only called during live debugging. */ |
| ScriptFrameIter i(cx, ScriptFrameIter::GO_THROUGH_SAVED); |
| if (!start) { |
| if (i.done()) { |
| fprintf(stderr, "no stack for cx = %p\n", (void*) cx); |
| return; |
| } |
| } else { |
| while (!i.done() && !i.isJit() && i.interpFrame() != start) |
| ++i; |
| |
| if (i.done()) { |
| fprintf(stderr, "fp = %p not found in cx = %p\n", |
| (void*)start, (void*)cx); |
| return; |
| } |
| } |
| |
| for (; !i.done(); ++i) { |
| if (i.isJit()) |
| fprintf(stderr, "JIT frame\n"); |
| else |
| fprintf(stderr, "InterpreterFrame at %p\n", (void*) i.interpFrame()); |
| |
| if (i.isFunctionFrame()) { |
| fprintf(stderr, "callee fun: "); |
| RootedValue v(cx); |
| JSObject* fun = i.callee(cx); |
| v.setObject(*fun); |
| dumpValue(v); |
| } else { |
| fprintf(stderr, "global frame, no callee"); |
| } |
| fputc('\n', stderr); |
| |
| fprintf(stderr, "file %s line %" PRIuSIZE "\n", |
| i.script()->filename(), i.script()->lineno()); |
| |
| if (jsbytecode* pc = i.pc()) { |
| fprintf(stderr, " pc = %p\n", pc); |
| fprintf(stderr, " current op: %s\n", CodeName[*pc]); |
| MaybeDumpObject("staticScope", i.script()->getStaticBlockScope(pc)); |
| } |
| if (i.isNonEvalFunctionFrame()) |
| MaybeDumpValue("this", i.thisArgument(cx)); |
| if (!i.isJit()) { |
| fprintf(stderr, " rval: "); |
| dumpValue(i.interpFrame()->returnValue()); |
| fputc('\n', stderr); |
| } |
| |
| fprintf(stderr, " flags:"); |
| if (i.isConstructing()) |
| fprintf(stderr, " constructing"); |
| if (!i.isJit() && i.interpFrame()->isDebuggerEvalFrame()) |
| fprintf(stderr, " debugger eval"); |
| if (i.isEvalFrame()) |
| fprintf(stderr, " eval"); |
| fputc('\n', stderr); |
| |
| fprintf(stderr, " scopeChain: (JSObject*) %p\n", (void*) i.scopeChain(cx)); |
| |
| fputc('\n', stderr); |
| } |
| } |
| |
| #endif /* DEBUG */ |
| |
| JS_FRIEND_API(void) |
| js::DumpBacktrace(JSContext* cx) |
| { |
| Sprinter sprinter(cx); |
| sprinter.init(); |
| size_t depth = 0; |
| for (AllFramesIter i(cx); !i.done(); ++i, ++depth) { |
| const char* filename = JS_GetScriptFilename(i.script()); |
| unsigned line = PCToLineNumber(i.script(), i.pc()); |
| JSScript* script = i.script(); |
| char frameType = |
| i.isInterp() ? 'i' : |
| i.isBaseline() ? 'b' : |
| i.isIon() ? 'I' : |
| i.isAsmJS() ? 'A' : |
| '?'; |
| |
| sprinter.printf("#%d %14p %c %s:%d (%p @ %d)\n", |
| depth, i.rawFramePtr(), frameType, filename, line, |
| script, script->pcToOffset(i.pc())); |
| } |
| fprintf(stdout, "%s", sprinter.string()); |
| #ifdef XP_WIN32 |
| if (IsDebuggerPresent()) { |
| OutputDebugStringA(sprinter.string()); |
| } |
| #endif |
| } |
| |
| |
| /* * */ |
| |
| 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(); |
| return GetBackgroundAllocKind(TypedArrayObject::AllocKindForLazyBuffer(nbytes)); |
| } |
| |
| // Proxies have finalizers and are not nursery allocated. |
| MOZ_ASSERT(!IsProxy(this)); |
| |
| // 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->objectsMallocHeapElementsNonAsmJS += 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); |
| } else if (is<AsmJSModuleObject>()) { |
| as<AsmJSModuleObject>().addSizeOfMisc(mallocSizeOf, &info->objectsNonHeapCodeAsmJS, |
| &info->objectsMallocHeapMisc); |
| #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(); |
| } |
| |
| template<> const char16_t JS::ubi::TracerConcrete<JSObject>::concreteTypeName[] = |
| MOZ_UTF16("JSObject"); |
| |
| void |
| JSObject::traceChildren(JSTracer* trc) |
| { |
| TraceEdge(trc, &group_, "group"); |
| |
| const Class* clasp = group_->clasp(); |
| if (clasp->trace) |
| clasp->trace(trc, this); |
| |
| if (clasp->isNative()) { |
| NativeObject* nobj = &as<NativeObject>(); |
| |
| TraceEdge(trc, &nobj->shape_, "shape"); |
| |
| { |
| 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()) { |
| HeapPtrNativeObject& owner = nobj->getElementsHeader()->ownerObject(); |
| if (owner != nobj) { |
| TraceEdge(trc, &owner, "objectElementsOwner"); |
| break; |
| } |
| } |
| |
| TraceRange(trc, |
| nobj->getDenseInitializedLength(), |
| static_cast<HeapSlot*>(nobj->getDenseElementsAllowCopyOnWrite()), |
| "objectElements"); |
| } while (false); |
| } |
| } |
| |
| 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()); |
| } |