mirror of
https://github.com/dart-lang/sdk
synced 2024-09-16 01:59:38 +00:00
8ed836fd6d
Prep for aligning image pages. Bug: https://github.com/dart-lang/sdk/issues/30978 Change-Id: I5abd5d73ac9fed427942218a827e144fc74593de Reviewed-on: https://dart-review.googlesource.com/18121 Reviewed-by: Siva Annamalai <asiva@google.com>
1640 lines
61 KiB
C++
1640 lines
61 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/snapshot.h"
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#include "platform/assert.h"
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#include "vm/bootstrap.h"
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#include "vm/class_finalizer.h"
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#include "vm/dart.h"
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#include "vm/exceptions.h"
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#include "vm/heap.h"
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#include "vm/longjump.h"
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#include "vm/object.h"
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#include "vm/object_store.h"
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#include "vm/snapshot_ids.h"
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#include "vm/symbols.h"
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#include "vm/timeline.h"
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#include "vm/version.h"
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// We currently only expect the Dart mutator to read snapshots.
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#define ASSERT_NO_SAFEPOINT_SCOPE() \
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isolate()->AssertCurrentThreadIsMutator(); \
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ASSERT(thread()->no_safepoint_scope_depth() != 0)
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namespace dart {
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static const int kNumInitialReferences = 32;
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static bool IsSingletonClassId(intptr_t class_id) {
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// Check if this is a singleton object class which is shared by all isolates.
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return ((class_id >= kClassCid && class_id <= kUnwindErrorCid) ||
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(class_id == kTypeArgumentsCid) ||
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(class_id >= kNullCid && class_id <= kVoidCid));
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}
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static bool IsObjectStoreClassId(intptr_t class_id) {
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// Check if this is a class which is stored in the object store.
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return (class_id == kObjectCid ||
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(class_id >= kInstanceCid && class_id <= kUserTagCid) ||
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class_id == kArrayCid || class_id == kImmutableArrayCid ||
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RawObject::IsStringClassId(class_id) ||
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RawObject::IsTypedDataClassId(class_id) ||
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RawObject::IsExternalTypedDataClassId(class_id) ||
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class_id == kNullCid);
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}
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static bool IsObjectStoreTypeId(intptr_t index) {
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// Check if this is a type which is stored in the object store.
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return (index >= kObjectType && index <= kArrayType);
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}
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static bool IsSplitClassId(intptr_t class_id) {
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// Return whether this class is serialized in two steps: first a reference,
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// with sufficient information to allocate a correctly sized object, and then
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// later inline with complete contents.
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return class_id >= kNumPredefinedCids || class_id == kArrayCid ||
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class_id == kImmutableArrayCid || class_id == kObjectPoolCid ||
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RawObject::IsImplicitFieldClassId(class_id);
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}
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static intptr_t ClassIdFromObjectId(intptr_t object_id) {
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ASSERT(object_id > kClassIdsOffset);
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intptr_t class_id = (object_id - kClassIdsOffset);
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return class_id;
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}
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static intptr_t ObjectIdFromClassId(intptr_t class_id) {
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ASSERT((class_id > kIllegalCid) && (class_id < kNumPredefinedCids));
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ASSERT(!(RawObject::IsImplicitFieldClassId(class_id)));
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return (class_id + kClassIdsOffset);
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}
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static RawType* GetType(ObjectStore* object_store, intptr_t index) {
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switch (index) {
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case kObjectType:
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return object_store->object_type();
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case kNullType:
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return object_store->null_type();
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case kFunctionType:
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return object_store->function_type();
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case kNumberType:
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return object_store->number_type();
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case kSmiType:
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return object_store->smi_type();
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case kMintType:
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return object_store->mint_type();
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case kDoubleType:
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return object_store->double_type();
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case kIntType:
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return object_store->int_type();
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case kBoolType:
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return object_store->bool_type();
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case kStringType:
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return object_store->string_type();
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case kArrayType:
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return object_store->array_type();
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default:
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break;
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}
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UNREACHABLE();
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return Type::null();
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}
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static intptr_t GetTypeIndex(ObjectStore* object_store,
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const RawType* raw_type) {
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ASSERT(raw_type->IsHeapObject());
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if (raw_type == object_store->object_type()) {
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return kObjectType;
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} else if (raw_type == object_store->null_type()) {
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return kNullType;
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} else if (raw_type == object_store->function_type()) {
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return kFunctionType;
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} else if (raw_type == object_store->number_type()) {
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return kNumberType;
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} else if (raw_type == object_store->smi_type()) {
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return kSmiType;
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} else if (raw_type == object_store->mint_type()) {
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return kMintType;
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} else if (raw_type == object_store->double_type()) {
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return kDoubleType;
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} else if (raw_type == object_store->int_type()) {
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return kIntType;
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} else if (raw_type == object_store->bool_type()) {
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return kBoolType;
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} else if (raw_type == object_store->string_type()) {
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return kStringType;
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} else if (raw_type == object_store->array_type()) {
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return kArrayType;
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}
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return kInvalidIndex;
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}
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const char* Snapshot::KindToCString(Kind kind) {
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switch (kind) {
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case kFull:
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return "full";
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case kScript:
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return "script";
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case kMessage:
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return "message";
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case kFullJIT:
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return "full-jit";
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case kFullAOT:
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return "full-aot";
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case kNone:
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return "none";
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case kInvalid:
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default:
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return "invalid";
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}
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}
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// TODO(5411462): Temporary setup of snapshot for testing purposes,
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// the actual creation of a snapshot maybe done differently.
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const Snapshot* Snapshot::SetupFromBuffer(const void* raw_memory) {
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ASSERT(raw_memory != NULL);
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ASSERT(kHeaderSize == sizeof(Snapshot));
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ASSERT(kLengthIndex == length_offset());
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ASSERT((kSnapshotFlagIndex * sizeof(int64_t)) == kind_offset());
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ASSERT((kHeapObjectTag & kInlined));
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const Snapshot* snapshot = reinterpret_cast<const Snapshot*>(raw_memory);
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// If the raw length is negative or greater than what the local machine can
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// handle, then signal an error.
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int64_t snapshot_length = ReadUnaligned(&snapshot->unaligned_length_);
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if ((snapshot_length < 0) || (snapshot_length > kIntptrMax)) {
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return NULL;
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}
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return snapshot;
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}
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RawSmi* BaseReader::ReadAsSmi() {
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intptr_t value = Read<int32_t>();
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ASSERT((value & kSmiTagMask) == kSmiTag);
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return reinterpret_cast<RawSmi*>(value);
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}
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intptr_t BaseReader::ReadSmiValue() {
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return Smi::Value(ReadAsSmi());
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}
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SnapshotReader::SnapshotReader(const uint8_t* buffer,
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intptr_t size,
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Snapshot::Kind kind,
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ZoneGrowableArray<BackRefNode>* backward_refs,
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Thread* thread)
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: BaseReader(buffer, size),
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kind_(kind),
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thread_(thread),
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zone_(thread->zone()),
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heap_(isolate()->heap()),
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old_space_(thread_->isolate()->heap()->old_space()),
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cls_(Class::Handle(zone_)),
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obj_(Object::Handle(zone_)),
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pobj_(PassiveObject::Handle(zone_)),
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array_(Array::Handle(zone_)),
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field_(Field::Handle(zone_)),
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str_(String::Handle(zone_)),
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library_(Library::Handle(zone_)),
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type_(AbstractType::Handle(zone_)),
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type_arguments_(TypeArguments::Handle(zone_)),
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tokens_(GrowableObjectArray::Handle(zone_)),
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stream_(TokenStream::Handle(zone_)),
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data_(ExternalTypedData::Handle(zone_)),
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typed_data_(TypedData::Handle(zone_)),
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function_(Function::Handle(zone_)),
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error_(UnhandledException::Handle(zone_)),
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max_vm_isolate_object_id_(
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(Snapshot::IsFull(kind))
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? Object::vm_isolate_snapshot_object_table().Length()
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: 0),
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backward_references_(backward_refs),
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objects_to_rehash_(GrowableObjectArray::Handle(zone_)) {}
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RawObject* SnapshotReader::ReadObject() {
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// Setup for long jump in case there is an exception while reading.
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LongJumpScope jump;
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if (setjmp(*jump.Set()) == 0) {
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objects_to_rehash_ = GrowableObjectArray::New(HEAP_SPACE(kind_));
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PassiveObject& obj =
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PassiveObject::Handle(zone(), ReadObjectImpl(kAsInlinedObject));
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for (intptr_t i = 0; i < backward_references_->length(); i++) {
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if (!(*backward_references_)[i].is_deserialized()) {
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ReadObjectImpl(kAsInlinedObject);
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(*backward_references_)[i].set_state(kIsDeserialized);
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}
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}
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Object& result = Object::Handle(zone_);
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if (backward_references_->length() > 0) {
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ProcessDeferredCanonicalizations();
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if (kind() == Snapshot::kScript) {
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FixSubclassesAndImplementors();
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}
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result = (*backward_references_)[0].reference()->raw();
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} else {
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result = obj.raw();
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}
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const Object& ok = Object::Handle(zone_, RunDelayedRehashingOfMaps());
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objects_to_rehash_ = GrowableObjectArray::null();
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if (!ok.IsNull()) {
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return ok.raw();
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}
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return result.raw();
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} else {
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// An error occurred while reading, return the error object.
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const Error& err = Error::Handle(thread()->sticky_error());
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thread()->clear_sticky_error();
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return err.raw();
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}
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}
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void SnapshotReader::EnqueueRehashingOfMap(const LinkedHashMap& map) {
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objects_to_rehash_.Add(map, HEAP_SPACE(kind_));
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}
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RawObject* SnapshotReader::RunDelayedRehashingOfMaps() {
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if (objects_to_rehash_.Length() > 0) {
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const Library& collections_lib =
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Library::Handle(zone_, Library::CollectionLibrary());
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const Function& rehashing_function = Function::Handle(
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zone_,
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collections_lib.LookupFunctionAllowPrivate(Symbols::_rehashObjects()));
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ASSERT(!rehashing_function.IsNull());
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const Array& arguments =
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Array::Handle(zone_, Array::New(1, HEAP_SPACE(kind_)));
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arguments.SetAt(0, objects_to_rehash_);
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return DartEntry::InvokeFunction(rehashing_function, arguments);
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}
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return Object::null();
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}
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RawClass* SnapshotReader::ReadClassId(intptr_t object_id) {
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ASSERT(!Snapshot::IsFull(kind_));
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// Read the class header information and lookup the class.
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intptr_t class_header = Read<int32_t>();
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ASSERT((class_header & kSmiTagMask) != kSmiTag);
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ASSERT(!IsVMIsolateObject(class_header) ||
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!IsSingletonClassId(GetVMIsolateObjectId(class_header)));
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ASSERT((SerializedHeaderTag::decode(class_header) != kObjectId) ||
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!IsObjectStoreClassId(SerializedHeaderData::decode(class_header)));
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Class& cls = Class::ZoneHandle(zone(), Class::null());
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AddBackRef(object_id, &cls, kIsDeserialized);
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// Read the library/class information and lookup the class.
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str_ ^= ReadObjectImpl(class_header, kAsInlinedObject, kInvalidPatchIndex, 0);
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library_ = Library::LookupLibrary(thread(), str_);
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if (library_.IsNull() || !library_.Loaded()) {
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SetReadException(
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"Invalid object found in message: library is not found or loaded.");
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}
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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if (str_.raw() == Symbols::TopLevel().raw()) {
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cls = library_.toplevel_class();
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} else {
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str_ = String::ScrubName(str_);
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cls = library_.LookupClassAllowPrivate(str_);
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}
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if (cls.IsNull()) {
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SetReadException("Invalid object found in message: class not found");
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}
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cls.EnsureIsFinalized(thread());
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return cls.raw();
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}
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RawFunction* SnapshotReader::ReadFunctionId(intptr_t object_id) {
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ASSERT(kind_ == Snapshot::kScript);
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// Read the function header information and lookup the function.
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intptr_t func_header = Read<int32_t>();
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ASSERT((func_header & kSmiTagMask) != kSmiTag);
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ASSERT(!IsVMIsolateObject(func_header) ||
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!IsSingletonClassId(GetVMIsolateObjectId(func_header)));
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ASSERT((SerializedHeaderTag::decode(func_header) != kObjectId) ||
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!IsObjectStoreClassId(SerializedHeaderData::decode(func_header)));
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Function& func = Function::ZoneHandle(zone(), Function::null());
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AddBackRef(object_id, &func, kIsDeserialized);
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// Read the library/class/function information and lookup the function.
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str_ ^= ReadObjectImpl(func_header, kAsInlinedObject, kInvalidPatchIndex, 0);
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library_ = Library::LookupLibrary(thread(), str_);
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if (library_.IsNull() || !library_.Loaded()) {
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SetReadException("Expected a library name, but found an invalid name.");
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}
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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if (str_.Equals(Symbols::TopLevel(), 0, Symbols::TopLevel().Length())) {
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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func ^= library_.LookupLocalFunction(str_);
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} else {
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cls_ = library_.LookupClassAllowPrivate(str_);
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if (cls_.IsNull()) {
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SetReadException("Expected a class name, but found an invalid name.");
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}
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cls_.EnsureIsFinalized(thread());
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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func ^= cls_.LookupFunctionAllowPrivate(str_);
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}
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if (func.IsNull()) {
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SetReadException("Expected a function name, but found an invalid name.");
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}
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return func.raw();
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}
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RawObject* SnapshotReader::ReadStaticImplicitClosure(intptr_t object_id,
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intptr_t class_header) {
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ASSERT(!Snapshot::IsFull(kind_));
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// First create a function object and associate it with the specified
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// 'object_id'.
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Function& func = Function::Handle(zone(), Function::null());
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Instance& obj = Instance::ZoneHandle(zone(), Instance::null());
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AddBackRef(object_id, &obj, kIsDeserialized);
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// Read the library/class/function information and lookup the function.
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// Note: WriteStaticImplicitClosure is *not* scrubbing the names before
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// writing them into the snapshot, because scrubbing requires allocation.
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// This means that names we read here might be mangled with private
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// keys. These keys need to be scrubbed before performing lookups
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// otherwise lookups might fail.
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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library_ = Library::LookupLibrary(thread(), str_);
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if (library_.IsNull() || !library_.Loaded()) {
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SetReadException("Invalid Library object found in message.");
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}
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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if (str_.Equals(Symbols::TopLevel())) {
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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str_ = String::ScrubName(str_);
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func = library_.LookupFunctionAllowPrivate(str_);
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} else {
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str_ = String::ScrubName(str_);
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cls_ = library_.LookupClassAllowPrivate(str_);
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if (cls_.IsNull()) {
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OS::Print("Name of class not found %s\n", str_.ToCString());
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SetReadException("Invalid Class object found in message.");
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}
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cls_.EnsureIsFinalized(thread());
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str_ ^= ReadObjectImpl(kAsInlinedObject);
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str_ = String::ScrubName(str_);
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func = cls_.LookupFunctionAllowPrivate(str_);
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}
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if (func.IsNull()) {
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SetReadException("Invalid function object found in message.");
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}
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func = func.ImplicitClosureFunction();
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ASSERT(!func.IsNull());
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// Return the associated implicit static closure.
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obj = func.ImplicitStaticClosure();
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return obj.raw();
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}
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intptr_t SnapshotReader::NextAvailableObjectId() const {
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return backward_references_->length() + kMaxPredefinedObjectIds +
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max_vm_isolate_object_id_;
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}
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void SnapshotReader::SetReadException(const char* msg) {
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const String& error_str = String::Handle(zone(), String::New(msg));
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const Array& args = Array::Handle(zone(), Array::New(1));
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args.SetAt(0, error_str);
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Object& result = Object::Handle(zone());
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const Library& library = Library::Handle(zone(), Library::CoreLibrary());
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result = DartLibraryCalls::InstanceCreate(library, Symbols::ArgumentError(),
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Symbols::Dot(), args);
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const StackTrace& stacktrace = StackTrace::Handle(zone());
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const UnhandledException& error = UnhandledException::Handle(
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zone(), UnhandledException::New(Instance::Cast(result), stacktrace));
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thread()->long_jump_base()->Jump(1, error);
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}
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RawObject* SnapshotReader::VmIsolateSnapshotObject(intptr_t index) const {
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return Object::vm_isolate_snapshot_object_table().At(index);
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}
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bool SnapshotReader::is_vm_isolate() const {
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return isolate() == Dart::vm_isolate();
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}
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RawObject* SnapshotReader::ReadObjectImpl(bool as_reference,
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intptr_t patch_object_id,
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intptr_t patch_offset) {
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int64_t header_value = Read<int64_t>();
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if ((header_value & kSmiTagMask) == kSmiTag) {
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return NewInteger(header_value);
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}
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ASSERT((header_value <= kIntptrMax) && (header_value >= kIntptrMin));
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return ReadObjectImpl(static_cast<intptr_t>(header_value), as_reference,
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patch_object_id, patch_offset);
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}
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RawObject* SnapshotReader::ReadObjectImpl(intptr_t header_value,
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bool as_reference,
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intptr_t patch_object_id,
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intptr_t patch_offset) {
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if (IsVMIsolateObject(header_value)) {
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return ReadVMIsolateObject(header_value);
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}
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if (SerializedHeaderTag::decode(header_value) == kObjectId) {
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return ReadIndexedObject(SerializedHeaderData::decode(header_value),
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patch_object_id, patch_offset);
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}
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ASSERT(SerializedHeaderTag::decode(header_value) == kInlined);
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intptr_t object_id = SerializedHeaderData::decode(header_value);
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if (object_id == kOmittedObjectId) {
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object_id = NextAvailableObjectId();
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}
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// Read the class header information.
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intptr_t class_header = Read<int32_t>();
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intptr_t tags = ReadTags();
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bool read_as_reference = as_reference && !RawObject::IsCanonical(tags);
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intptr_t header_id = SerializedHeaderData::decode(class_header);
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if (header_id == kInstanceObjectId) {
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return ReadInstance(object_id, tags, read_as_reference);
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|
} else if (header_id == kStaticImplicitClosureObjectId) {
|
|
// We skip the tags that have been written as the implicit static
|
|
// closure is going to be created in this isolate or the canonical
|
|
// version already created in the isolate will be used.
|
|
return ReadStaticImplicitClosure(object_id, class_header);
|
|
}
|
|
ASSERT((class_header & kSmiTagMask) != kSmiTag);
|
|
|
|
intptr_t class_id = LookupInternalClass(class_header);
|
|
switch (class_id) {
|
|
#define SNAPSHOT_READ(clazz) \
|
|
case clazz::kClassId: { \
|
|
pobj_ = clazz::ReadFrom(this, object_id, tags, kind_, read_as_reference); \
|
|
break; \
|
|
}
|
|
CLASS_LIST_NO_OBJECT(SNAPSHOT_READ)
|
|
#undef SNAPSHOT_READ
|
|
#define SNAPSHOT_READ(clazz) case kTypedData##clazz##Cid:
|
|
|
|
CLASS_LIST_TYPED_DATA(SNAPSHOT_READ) {
|
|
tags = RawObject::ClassIdTag::update(class_id, tags);
|
|
pobj_ =
|
|
TypedData::ReadFrom(this, object_id, tags, kind_, read_as_reference);
|
|
break;
|
|
}
|
|
#undef SNAPSHOT_READ
|
|
#define SNAPSHOT_READ(clazz) case kExternalTypedData##clazz##Cid:
|
|
|
|
CLASS_LIST_TYPED_DATA(SNAPSHOT_READ) {
|
|
tags = RawObject::ClassIdTag::update(class_id, tags);
|
|
pobj_ = ExternalTypedData::ReadFrom(this, object_id, tags, kind_, true);
|
|
break;
|
|
}
|
|
#undef SNAPSHOT_READ
|
|
default:
|
|
UNREACHABLE();
|
|
break;
|
|
}
|
|
if (!read_as_reference) {
|
|
AddPatchRecord(object_id, patch_object_id, patch_offset);
|
|
}
|
|
return pobj_.raw();
|
|
}
|
|
|
|
RawObject* SnapshotReader::ReadInstance(intptr_t object_id,
|
|
intptr_t tags,
|
|
bool as_reference) {
|
|
// Object is regular dart instance.
|
|
intptr_t instance_size = 0;
|
|
Instance* result = NULL;
|
|
DeserializeState state;
|
|
if (!as_reference) {
|
|
result = reinterpret_cast<Instance*>(GetBackRef(object_id));
|
|
state = kIsDeserialized;
|
|
} else {
|
|
state = kIsNotDeserialized;
|
|
}
|
|
if (result == NULL) {
|
|
result = &(Instance::ZoneHandle(zone(), Instance::null()));
|
|
AddBackRef(object_id, result, state);
|
|
cls_ ^= ReadObjectImpl(kAsInlinedObject);
|
|
ASSERT(!cls_.IsNull());
|
|
// Closure instances are handled by Closure::ReadFrom().
|
|
ASSERT(!cls_.IsClosureClass());
|
|
instance_size = cls_.instance_size();
|
|
ASSERT(instance_size > 0);
|
|
// Allocate the instance and read in all the fields for the object.
|
|
*result ^= Object::Allocate(cls_.id(), instance_size, HEAP_SPACE(kind_));
|
|
} else {
|
|
cls_ ^= ReadObjectImpl(kAsInlinedObject);
|
|
ASSERT(!cls_.IsNull());
|
|
instance_size = cls_.instance_size();
|
|
}
|
|
if (!as_reference) {
|
|
// Read all the individual fields for inlined objects.
|
|
intptr_t next_field_offset = cls_.next_field_offset();
|
|
|
|
intptr_t type_argument_field_offset = cls_.type_arguments_field_offset();
|
|
ASSERT(next_field_offset > 0);
|
|
// Instance::NextFieldOffset() returns the offset of the first field in
|
|
// a Dart object.
|
|
bool read_as_reference = RawObject::IsCanonical(tags) ? false : true;
|
|
intptr_t offset = Instance::NextFieldOffset();
|
|
intptr_t result_cid = result->GetClassId();
|
|
while (offset < next_field_offset) {
|
|
pobj_ =
|
|
ReadObjectImpl(read_as_reference, object_id, (offset / kWordSize));
|
|
result->SetFieldAtOffset(offset, pobj_);
|
|
if ((offset != type_argument_field_offset) &&
|
|
(kind_ == Snapshot::kMessage) && isolate()->use_field_guards()) {
|
|
// TODO(fschneider): Consider hoisting these lookups out of the loop.
|
|
// This would involve creating a handle, since cls_ can't be reused
|
|
// across the call to ReadObjectImpl.
|
|
cls_ = isolate()->class_table()->At(result_cid);
|
|
array_ = cls_.OffsetToFieldMap();
|
|
field_ ^= array_.At(offset >> kWordSizeLog2);
|
|
ASSERT(!field_.IsNull());
|
|
ASSERT(field_.Offset() == offset);
|
|
obj_ = pobj_.raw();
|
|
field_.RecordStore(obj_);
|
|
}
|
|
// TODO(fschneider): Verify the guarded cid and length for other kinds of
|
|
// snapshot (kFull, kScript) with asserts.
|
|
offset += kWordSize;
|
|
}
|
|
if (RawObject::IsCanonical(tags)) {
|
|
*result = result->CheckAndCanonicalize(thread(), NULL);
|
|
ASSERT(!result->IsNull());
|
|
}
|
|
}
|
|
return result->raw();
|
|
}
|
|
|
|
void SnapshotReader::AddBackRef(intptr_t id,
|
|
Object* obj,
|
|
DeserializeState state,
|
|
bool defer_canonicalization) {
|
|
intptr_t index = (id - kMaxPredefinedObjectIds);
|
|
ASSERT(index >= max_vm_isolate_object_id_);
|
|
index -= max_vm_isolate_object_id_;
|
|
ASSERT(index == backward_references_->length());
|
|
BackRefNode node(obj, state, defer_canonicalization);
|
|
backward_references_->Add(node);
|
|
}
|
|
|
|
Object* SnapshotReader::GetBackRef(intptr_t id) {
|
|
ASSERT(id >= kMaxPredefinedObjectIds);
|
|
intptr_t index = (id - kMaxPredefinedObjectIds);
|
|
ASSERT(index >= max_vm_isolate_object_id_);
|
|
index -= max_vm_isolate_object_id_;
|
|
if (index < backward_references_->length()) {
|
|
return (*backward_references_)[index].reference();
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
class HeapLocker : public StackResource {
|
|
public:
|
|
HeapLocker(Thread* thread, PageSpace* page_space)
|
|
: StackResource(thread), page_space_(page_space) {
|
|
page_space_->AcquireDataLock();
|
|
}
|
|
~HeapLocker() { page_space_->ReleaseDataLock(); }
|
|
|
|
private:
|
|
PageSpace* page_space_;
|
|
};
|
|
|
|
RawObject* SnapshotReader::ReadScriptSnapshot() {
|
|
ASSERT(kind_ == Snapshot::kScript);
|
|
|
|
// First read the version string, and check that it matches.
|
|
RawApiError* error = VerifyVersionAndFeatures(Isolate::Current());
|
|
if (error != ApiError::null()) {
|
|
return error;
|
|
}
|
|
|
|
// The version string matches. Read the rest of the snapshot.
|
|
obj_ = ReadObject();
|
|
if (!obj_.IsLibrary()) {
|
|
if (!obj_.IsError()) {
|
|
const intptr_t kMessageBufferSize = 128;
|
|
char message_buffer[kMessageBufferSize];
|
|
OS::SNPrint(message_buffer, kMessageBufferSize,
|
|
"Invalid object %s found in script snapshot",
|
|
obj_.ToCString());
|
|
const String& msg = String::Handle(String::New(message_buffer));
|
|
obj_ = ApiError::New(msg);
|
|
}
|
|
}
|
|
return obj_.raw();
|
|
}
|
|
|
|
RawApiError* SnapshotReader::VerifyVersionAndFeatures(Isolate* isolate) {
|
|
// If the version string doesn't match, return an error.
|
|
// Note: New things are allocated only if we're going to return an error.
|
|
|
|
const char* expected_version = Version::SnapshotString();
|
|
ASSERT(expected_version != NULL);
|
|
const intptr_t version_len = strlen(expected_version);
|
|
if (PendingBytes() < version_len) {
|
|
const intptr_t kMessageBufferSize = 128;
|
|
char message_buffer[kMessageBufferSize];
|
|
OS::SNPrint(message_buffer, kMessageBufferSize,
|
|
"No full snapshot version found, expected '%s'",
|
|
expected_version);
|
|
// This can also fail while bringing up the VM isolate, so make sure to
|
|
// allocate the error message in old space.
|
|
const String& msg = String::Handle(String::New(message_buffer, Heap::kOld));
|
|
return ApiError::New(msg, Heap::kOld);
|
|
}
|
|
|
|
const char* version = reinterpret_cast<const char*>(CurrentBufferAddress());
|
|
ASSERT(version != NULL);
|
|
if (strncmp(version, expected_version, version_len)) {
|
|
const intptr_t kMessageBufferSize = 256;
|
|
char message_buffer[kMessageBufferSize];
|
|
char* actual_version = OS::StrNDup(version, version_len);
|
|
OS::SNPrint(message_buffer, kMessageBufferSize,
|
|
"Wrong %s snapshot version, expected '%s' found '%s'",
|
|
(Snapshot::IsFull(kind_)) ? "full" : "script", expected_version,
|
|
actual_version);
|
|
free(actual_version);
|
|
// This can also fail while bringing up the VM isolate, so make sure to
|
|
// allocate the error message in old space.
|
|
const String& msg = String::Handle(String::New(message_buffer, Heap::kOld));
|
|
return ApiError::New(msg, Heap::kOld);
|
|
}
|
|
Advance(version_len);
|
|
|
|
const char* expected_features = Dart::FeaturesString(isolate, kind_);
|
|
ASSERT(expected_features != NULL);
|
|
const intptr_t expected_len = strlen(expected_features);
|
|
|
|
const char* features = reinterpret_cast<const char*>(CurrentBufferAddress());
|
|
ASSERT(features != NULL);
|
|
intptr_t buffer_len = OS::StrNLen(features, PendingBytes());
|
|
if ((buffer_len != expected_len) ||
|
|
strncmp(features, expected_features, expected_len)) {
|
|
const intptr_t kMessageBufferSize = 256;
|
|
char message_buffer[kMessageBufferSize];
|
|
char* actual_features =
|
|
OS::StrNDup(features, buffer_len < 128 ? buffer_len : 128);
|
|
OS::SNPrint(message_buffer, kMessageBufferSize,
|
|
"Snapshot not compatible with the current VM configuration: "
|
|
"the snapshot requires '%s' but the VM has '%s'",
|
|
actual_features, expected_features);
|
|
free(const_cast<char*>(expected_features));
|
|
free(actual_features);
|
|
// This can also fail while bringing up the VM isolate, so make sure to
|
|
// allocate the error message in old space.
|
|
const String& msg = String::Handle(String::New(message_buffer, Heap::kOld));
|
|
return ApiError::New(msg, Heap::kOld);
|
|
}
|
|
free(const_cast<char*>(expected_features));
|
|
Advance(expected_len + 1);
|
|
return ApiError::null();
|
|
}
|
|
|
|
RawObject* SnapshotReader::NewInteger(int64_t value) {
|
|
ASSERT((value & kSmiTagMask) == kSmiTag);
|
|
value = value >> kSmiTagShift;
|
|
if (Smi::IsValid(value)) {
|
|
return Smi::New(static_cast<intptr_t>(value));
|
|
}
|
|
return Mint::NewCanonical(value);
|
|
}
|
|
|
|
intptr_t SnapshotReader::LookupInternalClass(intptr_t class_header) {
|
|
// If the header is an object Id, lookup singleton VM classes or classes
|
|
// stored in the object store.
|
|
if (IsVMIsolateObject(class_header)) {
|
|
intptr_t class_id = GetVMIsolateObjectId(class_header);
|
|
ASSERT(IsSingletonClassId(class_id));
|
|
return class_id;
|
|
}
|
|
ASSERT(SerializedHeaderTag::decode(class_header) == kObjectId);
|
|
intptr_t class_id = SerializedHeaderData::decode(class_header);
|
|
ASSERT(IsObjectStoreClassId(class_id) || IsSingletonClassId(class_id));
|
|
return class_id;
|
|
}
|
|
|
|
#define READ_VM_SINGLETON_OBJ(id, obj) \
|
|
if (object_id == id) { \
|
|
return obj; \
|
|
}
|
|
|
|
RawObject* SnapshotReader::ReadVMIsolateObject(intptr_t header_value) {
|
|
intptr_t object_id = GetVMIsolateObjectId(header_value);
|
|
|
|
// First check if it is one of the singleton objects.
|
|
READ_VM_SINGLETON_OBJ(kNullObject, Object::null());
|
|
READ_VM_SINGLETON_OBJ(kSentinelObject, Object::sentinel().raw());
|
|
READ_VM_SINGLETON_OBJ(kTransitionSentinelObject,
|
|
Object::transition_sentinel().raw());
|
|
READ_VM_SINGLETON_OBJ(kEmptyArrayObject, Object::empty_array().raw());
|
|
READ_VM_SINGLETON_OBJ(kZeroArrayObject, Object::zero_array().raw());
|
|
READ_VM_SINGLETON_OBJ(kDynamicType, Object::dynamic_type().raw());
|
|
READ_VM_SINGLETON_OBJ(kVoidType, Object::void_type().raw());
|
|
READ_VM_SINGLETON_OBJ(kTrueValue, Bool::True().raw());
|
|
READ_VM_SINGLETON_OBJ(kFalseValue, Bool::False().raw());
|
|
READ_VM_SINGLETON_OBJ(kExtractorParameterTypes,
|
|
Object::extractor_parameter_types().raw());
|
|
READ_VM_SINGLETON_OBJ(kExtractorParameterNames,
|
|
Object::extractor_parameter_names().raw());
|
|
READ_VM_SINGLETON_OBJ(kEmptyContextObject, Object::empty_context().raw());
|
|
READ_VM_SINGLETON_OBJ(kEmptyContextScopeObject,
|
|
Object::empty_context_scope().raw());
|
|
READ_VM_SINGLETON_OBJ(kEmptyObjectPool, Object::empty_object_pool().raw());
|
|
READ_VM_SINGLETON_OBJ(kEmptyDescriptors, Object::empty_descriptors().raw());
|
|
READ_VM_SINGLETON_OBJ(kEmptyVarDescriptors,
|
|
Object::empty_var_descriptors().raw());
|
|
READ_VM_SINGLETON_OBJ(kEmptyExceptionHandlers,
|
|
Object::empty_exception_handlers().raw());
|
|
|
|
// Check if it is a double.
|
|
if (object_id == kDoubleObject) {
|
|
ASSERT(kind_ == Snapshot::kMessage);
|
|
return Double::New(ReadDouble());
|
|
}
|
|
|
|
// Check it is a singleton class object.
|
|
intptr_t class_id = ClassIdFromObjectId(object_id);
|
|
if (IsSingletonClassId(class_id)) {
|
|
return isolate()->class_table()->At(class_id); // get singleton class.
|
|
}
|
|
|
|
// Check if it is a singleton Argument descriptor object.
|
|
for (intptr_t i = 0; i < ArgumentsDescriptor::kCachedDescriptorCount; i++) {
|
|
if (object_id == (kCachedArgumentsDescriptor0 + i)) {
|
|
return ArgumentsDescriptor::cached_args_descriptors_[i];
|
|
}
|
|
}
|
|
|
|
// Check if it is a singleton ICData array object.
|
|
for (intptr_t i = 0; i < ICData::kCachedICDataArrayCount; i++) {
|
|
if (object_id == (kCachedICDataArray0 + i)) {
|
|
return ICData::cached_icdata_arrays_[i];
|
|
}
|
|
}
|
|
|
|
ASSERT(Symbols::IsPredefinedSymbolId(object_id));
|
|
return Symbols::GetPredefinedSymbol(object_id); // return VM symbol.
|
|
}
|
|
|
|
RawObject* SnapshotReader::ReadIndexedObject(intptr_t object_id,
|
|
intptr_t patch_object_id,
|
|
intptr_t patch_offset) {
|
|
intptr_t class_id = ClassIdFromObjectId(object_id);
|
|
if (IsObjectStoreClassId(class_id)) {
|
|
return isolate()->class_table()->At(class_id); // get singleton class.
|
|
}
|
|
if (IsObjectStoreTypeId(object_id)) {
|
|
return GetType(object_store(), object_id); // return type obj.
|
|
}
|
|
ASSERT(object_id >= kMaxPredefinedObjectIds);
|
|
intptr_t index = (object_id - kMaxPredefinedObjectIds);
|
|
if (index < max_vm_isolate_object_id_) {
|
|
return VmIsolateSnapshotObject(index);
|
|
}
|
|
AddPatchRecord(object_id, patch_object_id, patch_offset);
|
|
return GetBackRef(object_id)->raw();
|
|
}
|
|
|
|
void SnapshotReader::AddPatchRecord(intptr_t object_id,
|
|
intptr_t patch_object_id,
|
|
intptr_t patch_offset) {
|
|
if (patch_object_id != kInvalidPatchIndex) {
|
|
ASSERT(object_id >= kMaxPredefinedObjectIds);
|
|
intptr_t index = (object_id - kMaxPredefinedObjectIds);
|
|
ASSERT(index >= max_vm_isolate_object_id_);
|
|
index -= max_vm_isolate_object_id_;
|
|
ASSERT(index < backward_references_->length());
|
|
BackRefNode& ref = (*backward_references_)[index];
|
|
ref.AddPatchRecord(patch_object_id, patch_offset);
|
|
}
|
|
}
|
|
|
|
void SnapshotReader::ProcessDeferredCanonicalizations() {
|
|
Type& typeobj = Type::Handle();
|
|
TypeArguments& typeargs = TypeArguments::Handle();
|
|
Object& newobj = Object::Handle();
|
|
for (intptr_t i = 0; i < backward_references_->length(); i++) {
|
|
BackRefNode& backref = (*backward_references_)[i];
|
|
if (backref.defer_canonicalization()) {
|
|
Object* objref = backref.reference();
|
|
// Object should either be a type or a type argument.
|
|
if (objref->IsType()) {
|
|
typeobj ^= objref->raw();
|
|
newobj = typeobj.Canonicalize();
|
|
} else {
|
|
ASSERT(objref->IsTypeArguments());
|
|
typeargs ^= objref->raw();
|
|
newobj = typeargs.Canonicalize();
|
|
}
|
|
if (newobj.raw() != objref->raw()) {
|
|
ZoneGrowableArray<intptr_t>* patches = backref.patch_records();
|
|
ASSERT(newobj.IsNull() || newobj.IsCanonical());
|
|
// First we replace the back ref table with the canonical object.
|
|
*objref = newobj.raw();
|
|
if (patches != NULL) {
|
|
// Now go over all the patch records and patch the canonical object.
|
|
for (intptr_t j = 0; j < patches->length(); j += 2) {
|
|
NoSafepointScope no_safepoint;
|
|
intptr_t patch_object_id = (*patches)[j];
|
|
intptr_t patch_offset = (*patches)[j + 1];
|
|
Object* target = GetBackRef(patch_object_id);
|
|
// We should not backpatch an object that is canonical.
|
|
if (!target->IsCanonical()) {
|
|
RawObject** rawptr =
|
|
reinterpret_cast<RawObject**>(target->raw()->ptr());
|
|
target->StorePointer((rawptr + patch_offset), newobj.raw());
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
ASSERT(objref->IsCanonical());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void SnapshotReader::FixSubclassesAndImplementors() {
|
|
Class& cls = Class::Handle(zone());
|
|
Class& supercls = Class::Handle(zone());
|
|
Array& interfaces = Array::Handle(zone());
|
|
AbstractType& interface = AbstractType::Handle(zone());
|
|
Class& interface_cls = Class::Handle(zone());
|
|
for (intptr_t i = 0; i < backward_references_->length(); i++) {
|
|
BackRefNode& backref = (*backward_references_)[i];
|
|
Object* objref = backref.reference();
|
|
if (objref->IsClass()) {
|
|
cls ^= objref->raw();
|
|
if (!cls.IsInFullSnapshot()) {
|
|
supercls = cls.SuperClass();
|
|
if (!supercls.IsNull() && !supercls.IsObjectClass() &&
|
|
supercls.IsInFullSnapshot()) {
|
|
supercls.AddDirectSubclass(cls);
|
|
supercls.DisableCHAOptimizedCode(cls);
|
|
}
|
|
interfaces = cls.interfaces();
|
|
for (intptr_t i = 0; i < interfaces.Length(); i++) {
|
|
interface ^= interfaces.At(i);
|
|
interface_cls = interface.type_class();
|
|
interface_cls.set_is_implemented();
|
|
interface_cls.DisableCHAOptimizedCode(cls);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void SnapshotReader::ArrayReadFrom(intptr_t object_id,
|
|
const Array& result,
|
|
intptr_t len,
|
|
intptr_t tags) {
|
|
// Setup the object fields.
|
|
const intptr_t typeargs_offset =
|
|
GrowableObjectArray::type_arguments_offset() / kWordSize;
|
|
*TypeArgumentsHandle() ^=
|
|
ReadObjectImpl(kAsInlinedObject, object_id, typeargs_offset);
|
|
result.SetTypeArguments(*TypeArgumentsHandle());
|
|
|
|
bool as_reference = RawObject::IsCanonical(tags) ? false : true;
|
|
intptr_t offset = result.raw_ptr()->data() -
|
|
reinterpret_cast<RawObject**>(result.raw()->ptr());
|
|
for (intptr_t i = 0; i < len; i++) {
|
|
*PassiveObjectHandle() =
|
|
ReadObjectImpl(as_reference, object_id, (i + offset));
|
|
result.SetAt(i, *PassiveObjectHandle());
|
|
}
|
|
}
|
|
|
|
ScriptSnapshotReader::ScriptSnapshotReader(const uint8_t* buffer,
|
|
intptr_t size,
|
|
Thread* thread)
|
|
: SnapshotReader(buffer,
|
|
size,
|
|
Snapshot::kScript,
|
|
new ZoneGrowableArray<BackRefNode>(kNumInitialReferences),
|
|
thread) {}
|
|
|
|
ScriptSnapshotReader::~ScriptSnapshotReader() {
|
|
ResetBackwardReferenceTable();
|
|
}
|
|
|
|
MessageSnapshotReader::MessageSnapshotReader(const uint8_t* buffer,
|
|
intptr_t size,
|
|
Thread* thread)
|
|
: SnapshotReader(buffer,
|
|
size,
|
|
Snapshot::kMessage,
|
|
new ZoneGrowableArray<BackRefNode>(kNumInitialReferences),
|
|
thread) {}
|
|
|
|
MessageSnapshotReader::~MessageSnapshotReader() {
|
|
ResetBackwardReferenceTable();
|
|
}
|
|
|
|
SnapshotWriter::SnapshotWriter(Thread* thread,
|
|
Snapshot::Kind kind,
|
|
uint8_t** buffer,
|
|
ReAlloc alloc,
|
|
DeAlloc dealloc,
|
|
intptr_t initial_size,
|
|
ForwardList* forward_list,
|
|
bool can_send_any_object)
|
|
: BaseWriter(buffer, alloc, dealloc, initial_size),
|
|
thread_(thread),
|
|
kind_(kind),
|
|
object_store_(isolate()->object_store()),
|
|
class_table_(isolate()->class_table()),
|
|
forward_list_(forward_list),
|
|
exception_type_(Exceptions::kNone),
|
|
exception_msg_(NULL),
|
|
can_send_any_object_(can_send_any_object) {
|
|
ASSERT(forward_list_ != NULL);
|
|
}
|
|
|
|
void SnapshotWriter::WriteObject(RawObject* rawobj) {
|
|
WriteObjectImpl(rawobj, kAsInlinedObject);
|
|
WriteForwardedObjects();
|
|
}
|
|
|
|
uint32_t SnapshotWriter::GetObjectTags(RawObject* raw) {
|
|
return raw->ptr()->tags_;
|
|
}
|
|
|
|
uword SnapshotWriter::GetObjectTagsAndHash(RawObject* raw) {
|
|
uword result = raw->ptr()->tags_;
|
|
#if defined(HASH_IN_OBJECT_HEADER)
|
|
result |= static_cast<uword>(raw->ptr()->hash_) << 32;
|
|
#endif
|
|
return result;
|
|
}
|
|
|
|
#define VM_OBJECT_CLASS_LIST(V) \
|
|
V(OneByteString) \
|
|
V(TwoByteString) \
|
|
V(Mint) \
|
|
V(Bigint) \
|
|
V(Double) \
|
|
V(ImmutableArray)
|
|
|
|
#define VM_OBJECT_WRITE(clazz) \
|
|
case clazz::kClassId: { \
|
|
object_id = forward_list_->AddObject(zone(), rawobj, kIsSerialized); \
|
|
Raw##clazz* raw_obj = reinterpret_cast<Raw##clazz*>(rawobj); \
|
|
raw_obj->WriteTo(this, object_id, kind(), false); \
|
|
return true; \
|
|
}
|
|
|
|
#define WRITE_VM_SINGLETON_OBJ(obj, id) \
|
|
if (rawobj == obj) { \
|
|
WriteVMIsolateObject(id); \
|
|
return true; \
|
|
}
|
|
|
|
bool SnapshotWriter::HandleVMIsolateObject(RawObject* rawobj) {
|
|
// Check if it is one of the singleton VM objects.
|
|
WRITE_VM_SINGLETON_OBJ(Object::null(), kNullObject);
|
|
WRITE_VM_SINGLETON_OBJ(Object::sentinel().raw(), kSentinelObject);
|
|
WRITE_VM_SINGLETON_OBJ(Object::transition_sentinel().raw(),
|
|
kTransitionSentinelObject);
|
|
WRITE_VM_SINGLETON_OBJ(Object::empty_array().raw(), kEmptyArrayObject);
|
|
WRITE_VM_SINGLETON_OBJ(Object::zero_array().raw(), kZeroArrayObject);
|
|
WRITE_VM_SINGLETON_OBJ(Object::dynamic_type().raw(), kDynamicType);
|
|
WRITE_VM_SINGLETON_OBJ(Object::void_type().raw(), kVoidType);
|
|
WRITE_VM_SINGLETON_OBJ(Bool::True().raw(), kTrueValue);
|
|
WRITE_VM_SINGLETON_OBJ(Bool::False().raw(), kFalseValue);
|
|
WRITE_VM_SINGLETON_OBJ(Object::extractor_parameter_types().raw(),
|
|
kExtractorParameterTypes);
|
|
WRITE_VM_SINGLETON_OBJ(Object::extractor_parameter_names().raw(),
|
|
kExtractorParameterNames);
|
|
WRITE_VM_SINGLETON_OBJ(Object::empty_context().raw(), kEmptyContextObject);
|
|
WRITE_VM_SINGLETON_OBJ(Object::empty_context_scope().raw(),
|
|
kEmptyContextScopeObject);
|
|
WRITE_VM_SINGLETON_OBJ(Object::empty_object_pool().raw(), kEmptyObjectPool);
|
|
WRITE_VM_SINGLETON_OBJ(Object::empty_descriptors().raw(), kEmptyDescriptors);
|
|
WRITE_VM_SINGLETON_OBJ(Object::empty_var_descriptors().raw(),
|
|
kEmptyVarDescriptors);
|
|
WRITE_VM_SINGLETON_OBJ(Object::empty_exception_handlers().raw(),
|
|
kEmptyExceptionHandlers);
|
|
|
|
// Check if it is a singleton class object which is shared by
|
|
// all isolates.
|
|
intptr_t id = rawobj->GetClassId();
|
|
if (id == kClassCid) {
|
|
RawClass* raw_class = reinterpret_cast<RawClass*>(rawobj);
|
|
intptr_t class_id = raw_class->ptr()->id_;
|
|
if (IsSingletonClassId(class_id)) {
|
|
intptr_t object_id = ObjectIdFromClassId(class_id);
|
|
WriteVMIsolateObject(object_id);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Check if it is a singleton Argument descriptor object.
|
|
for (intptr_t i = 0; i < ArgumentsDescriptor::kCachedDescriptorCount; i++) {
|
|
if (rawobj == ArgumentsDescriptor::cached_args_descriptors_[i]) {
|
|
WriteVMIsolateObject(kCachedArgumentsDescriptor0 + i);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Check if it is a singleton ICData array object.
|
|
for (intptr_t i = 0; i < ICData::kCachedICDataArrayCount; i++) {
|
|
if (rawobj == ICData::cached_icdata_arrays_[i]) {
|
|
WriteVMIsolateObject(kCachedICDataArray0 + i);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// In the case of script snapshots or for messages we do not use
|
|
// the index into the vm isolate snapshot object table, instead we
|
|
// explicitly write the object out.
|
|
intptr_t object_id = forward_list_->FindObject(rawobj);
|
|
if (object_id != -1) {
|
|
WriteIndexedObject(object_id);
|
|
return true;
|
|
} else {
|
|
switch (id) {
|
|
VM_OBJECT_CLASS_LIST(VM_OBJECT_WRITE)
|
|
case kTypedDataUint32ArrayCid: {
|
|
object_id = forward_list_->AddObject(zone(), rawobj, kIsSerialized);
|
|
RawTypedData* raw_obj = reinterpret_cast<RawTypedData*>(rawobj);
|
|
raw_obj->WriteTo(this, object_id, kind(), false);
|
|
return true;
|
|
}
|
|
default:
|
|
OS::Print("class id = %" Pd "\n", id);
|
|
break;
|
|
}
|
|
}
|
|
|
|
const Object& obj = Object::Handle(rawobj);
|
|
FATAL1("Unexpected reference to object in VM isolate: %s\n", obj.ToCString());
|
|
return false;
|
|
}
|
|
|
|
#undef VM_OBJECT_WRITE
|
|
|
|
ForwardList::ForwardList(Thread* thread, intptr_t first_object_id)
|
|
: thread_(thread),
|
|
first_object_id_(first_object_id),
|
|
nodes_(),
|
|
first_unprocessed_object_id_(first_object_id) {
|
|
ASSERT(first_object_id > 0);
|
|
}
|
|
|
|
ForwardList::~ForwardList() {
|
|
heap()->ResetObjectIdTable();
|
|
}
|
|
|
|
intptr_t ForwardList::AddObject(Zone* zone,
|
|
RawObject* raw,
|
|
SerializeState state) {
|
|
NoSafepointScope no_safepoint;
|
|
intptr_t object_id = next_object_id();
|
|
ASSERT(object_id > 0 && object_id <= kMaxObjectId);
|
|
const Object& obj = Object::ZoneHandle(zone, raw);
|
|
Node* node = new Node(&obj, state);
|
|
ASSERT(node != NULL);
|
|
nodes_.Add(node);
|
|
ASSERT(object_id != 0);
|
|
heap()->SetObjectId(raw, object_id);
|
|
return object_id;
|
|
}
|
|
|
|
intptr_t ForwardList::FindObject(RawObject* raw) {
|
|
NoSafepointScope no_safepoint;
|
|
intptr_t id = heap()->GetObjectId(raw);
|
|
ASSERT(id == 0 || NodeForObjectId(id)->obj()->raw() == raw);
|
|
return (id == 0) ? static_cast<intptr_t>(kInvalidIndex) : id;
|
|
}
|
|
|
|
bool SnapshotWriter::CheckAndWritePredefinedObject(RawObject* rawobj) {
|
|
// Check if object can be written in one of the following ways:
|
|
// - Smi: the Smi value is written as is (last bit is not tagged).
|
|
// - VM internal class (from VM isolate): (index of class in vm isolate | 0x3)
|
|
// - Object that has already been written: (negative id in stream | 0x3)
|
|
|
|
NoSafepointScope no_safepoint;
|
|
|
|
// First check if it is a Smi (i.e not a heap object).
|
|
if (!rawobj->IsHeapObject()) {
|
|
Write<int64_t>(reinterpret_cast<intptr_t>(rawobj));
|
|
return true;
|
|
}
|
|
|
|
intptr_t cid = rawobj->GetClassId();
|
|
|
|
if ((kind_ == Snapshot::kMessage) && (cid == kDoubleCid)) {
|
|
WriteVMIsolateObject(kDoubleObject);
|
|
RawDouble* rd = reinterpret_cast<RawDouble*>(rawobj);
|
|
WriteDouble(rd->ptr()->value_);
|
|
return true;
|
|
}
|
|
|
|
// Check if object has already been serialized, in that case just write
|
|
// the object id out.
|
|
intptr_t object_id = forward_list_->FindObject(rawobj);
|
|
if (object_id != kInvalidIndex) {
|
|
WriteIndexedObject(object_id);
|
|
return true;
|
|
}
|
|
|
|
// Now check if it is an object from the VM isolate. These objects are shared
|
|
// by all isolates.
|
|
if (rawobj->IsVMHeapObject() && HandleVMIsolateObject(rawobj)) {
|
|
return true;
|
|
}
|
|
|
|
// Check if it is a code object in that case just write a Null object
|
|
// as we do not want code objects in the snapshot.
|
|
if (cid == kCodeCid) {
|
|
WriteVMIsolateObject(kNullObject);
|
|
return true;
|
|
}
|
|
|
|
// Check if classes are not being serialized and it is preinitialized type
|
|
// or a predefined internal VM class in the object store.
|
|
// Check if it is an internal VM class which is in the object store.
|
|
if (cid == kClassCid) {
|
|
RawClass* raw_class = reinterpret_cast<RawClass*>(rawobj);
|
|
intptr_t class_id = raw_class->ptr()->id_;
|
|
if (IsObjectStoreClassId(class_id)) {
|
|
intptr_t object_id = ObjectIdFromClassId(class_id);
|
|
WriteIndexedObject(object_id);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Now check it is a preinitialized type object.
|
|
RawType* raw_type = reinterpret_cast<RawType*>(rawobj);
|
|
intptr_t index = GetTypeIndex(object_store(), raw_type);
|
|
if (index != kInvalidIndex) {
|
|
WriteIndexedObject(index);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void SnapshotWriter::WriteObjectImpl(RawObject* raw, bool as_reference) {
|
|
// First check if object can be written as a simple predefined type.
|
|
if (CheckAndWritePredefinedObject(raw)) {
|
|
return;
|
|
}
|
|
|
|
// When we know that we are dealing with leaf or shallow objects we write
|
|
// these objects inline even when 'as_reference' is true.
|
|
const bool write_as_reference = as_reference && !raw->IsCanonical();
|
|
uintptr_t tags = GetObjectTagsAndHash(raw);
|
|
|
|
// Add object to the forward ref list and mark it so that future references
|
|
// to this object in the snapshot will use this object id. Mark the
|
|
// serialization state so that we do the right thing when we go through
|
|
// the forward list.
|
|
intptr_t class_id = raw->GetClassId();
|
|
intptr_t object_id;
|
|
if (write_as_reference && IsSplitClassId(class_id)) {
|
|
object_id = forward_list_->AddObject(zone(), raw, kIsNotSerialized);
|
|
} else {
|
|
object_id = forward_list_->AddObject(zone(), raw, kIsSerialized);
|
|
}
|
|
if (write_as_reference || !IsSplitClassId(class_id)) {
|
|
object_id = kOmittedObjectId;
|
|
}
|
|
WriteMarkedObjectImpl(raw, tags, object_id, write_as_reference);
|
|
}
|
|
|
|
void SnapshotWriter::WriteMarkedObjectImpl(RawObject* raw,
|
|
intptr_t tags,
|
|
intptr_t object_id,
|
|
bool as_reference) {
|
|
NoSafepointScope no_safepoint;
|
|
RawClass* cls = class_table_->At(RawObject::ClassIdTag::decode(tags));
|
|
intptr_t class_id = cls->ptr()->id_;
|
|
ASSERT(class_id == RawObject::ClassIdTag::decode(tags));
|
|
if (class_id >= kNumPredefinedCids ||
|
|
RawObject::IsImplicitFieldClassId(class_id)) {
|
|
WriteInstance(raw, cls, tags, object_id, as_reference);
|
|
return;
|
|
}
|
|
switch (class_id) {
|
|
#define SNAPSHOT_WRITE(clazz) \
|
|
case clazz::kClassId: { \
|
|
Raw##clazz* raw_obj = reinterpret_cast<Raw##clazz*>(raw); \
|
|
raw_obj->WriteTo(this, object_id, kind_, as_reference); \
|
|
return; \
|
|
}
|
|
|
|
CLASS_LIST_NO_OBJECT(SNAPSHOT_WRITE)
|
|
#undef SNAPSHOT_WRITE
|
|
#define SNAPSHOT_WRITE(clazz) case kTypedData##clazz##Cid:
|
|
|
|
CLASS_LIST_TYPED_DATA(SNAPSHOT_WRITE) {
|
|
RawTypedData* raw_obj = reinterpret_cast<RawTypedData*>(raw);
|
|
raw_obj->WriteTo(this, object_id, kind_, as_reference);
|
|
return;
|
|
}
|
|
#undef SNAPSHOT_WRITE
|
|
#define SNAPSHOT_WRITE(clazz) case kExternalTypedData##clazz##Cid:
|
|
|
|
CLASS_LIST_TYPED_DATA(SNAPSHOT_WRITE) {
|
|
RawExternalTypedData* raw_obj =
|
|
reinterpret_cast<RawExternalTypedData*>(raw);
|
|
raw_obj->WriteTo(this, object_id, kind_, as_reference);
|
|
return;
|
|
}
|
|
#undef SNAPSHOT_WRITE
|
|
default:
|
|
break;
|
|
}
|
|
|
|
const Object& obj = Object::Handle(raw);
|
|
FATAL1("Unexpected object: %s\n", obj.ToCString());
|
|
}
|
|
|
|
class WriteInlinedObjectVisitor : public ObjectVisitor {
|
|
public:
|
|
explicit WriteInlinedObjectVisitor(SnapshotWriter* writer)
|
|
: writer_(writer) {}
|
|
|
|
virtual void VisitObject(RawObject* obj) {
|
|
intptr_t object_id = writer_->forward_list_->FindObject(obj);
|
|
ASSERT(object_id != kInvalidIndex);
|
|
intptr_t tags = MessageWriter::GetObjectTagsAndHash(obj);
|
|
writer_->WriteMarkedObjectImpl(obj, tags, object_id, kAsInlinedObject);
|
|
}
|
|
|
|
private:
|
|
SnapshotWriter* writer_;
|
|
};
|
|
|
|
void SnapshotWriter::WriteForwardedObjects() {
|
|
WriteInlinedObjectVisitor visitor(this);
|
|
forward_list_->SerializeAll(&visitor);
|
|
}
|
|
|
|
void ForwardList::SerializeAll(ObjectVisitor* writer) {
|
|
// Write out all objects that were added to the forward list and have
|
|
// not been serialized yet. These would typically be fields of instance
|
|
// objects, arrays or immutable arrays (this is done in order to avoid
|
|
// deep recursive calls to WriteObjectImpl).
|
|
// NOTE: The forward list might grow as we process the list.
|
|
#ifdef DEBUG
|
|
for (intptr_t i = first_object_id(); i < first_unprocessed_object_id_; ++i) {
|
|
ASSERT(NodeForObjectId(i)->is_serialized());
|
|
}
|
|
#endif // DEBUG
|
|
for (intptr_t id = first_unprocessed_object_id_; id < next_object_id();
|
|
++id) {
|
|
if (!NodeForObjectId(id)->is_serialized()) {
|
|
// Write the object out in the stream.
|
|
RawObject* raw = NodeForObjectId(id)->obj()->raw();
|
|
writer->VisitObject(raw);
|
|
|
|
// Mark object as serialized.
|
|
NodeForObjectId(id)->set_state(kIsSerialized);
|
|
}
|
|
}
|
|
first_unprocessed_object_id_ = next_object_id();
|
|
}
|
|
|
|
void SnapshotWriter::WriteClassId(RawClass* cls) {
|
|
ASSERT(!Snapshot::IsFull(kind_));
|
|
int class_id = cls->ptr()->id_;
|
|
ASSERT(!IsSingletonClassId(class_id) && !IsObjectStoreClassId(class_id));
|
|
|
|
// Write out the library url and class name.
|
|
RawLibrary* library = cls->ptr()->library_;
|
|
ASSERT(library != Library::null());
|
|
WriteObjectImpl(library->ptr()->url_, kAsInlinedObject);
|
|
WriteObjectImpl(cls->ptr()->name_, kAsInlinedObject);
|
|
}
|
|
|
|
void SnapshotWriter::WriteFunctionId(RawFunction* func, bool owner_is_class) {
|
|
ASSERT(kind_ == Snapshot::kScript);
|
|
RawClass* cls = (owner_is_class)
|
|
? reinterpret_cast<RawClass*>(func->ptr()->owner_)
|
|
: reinterpret_cast<RawPatchClass*>(func->ptr()->owner_)
|
|
->ptr()
|
|
->patched_class_;
|
|
|
|
// Write out the library url and class name.
|
|
RawLibrary* library = cls->ptr()->library_;
|
|
ASSERT(library != Library::null());
|
|
WriteObjectImpl(library->ptr()->url_, kAsInlinedObject);
|
|
WriteObjectImpl(cls->ptr()->name_, kAsInlinedObject);
|
|
WriteObjectImpl(func->ptr()->name_, kAsInlinedObject);
|
|
}
|
|
|
|
void SnapshotWriter::WriteStaticImplicitClosure(intptr_t object_id,
|
|
RawFunction* func,
|
|
intptr_t tags) {
|
|
// Write out the serialization header value for this object.
|
|
WriteInlinedObjectHeader(object_id);
|
|
|
|
// Indicate this is a static implicit closure object.
|
|
Write<int32_t>(SerializedHeaderData::encode(kStaticImplicitClosureObjectId));
|
|
|
|
// Write out the tags.
|
|
WriteTags(tags);
|
|
|
|
// Write out the library url, class name and signature function name.
|
|
RawClass* cls = GetFunctionOwner(func);
|
|
ASSERT(cls != Class::null());
|
|
RawLibrary* library = cls->ptr()->library_;
|
|
ASSERT(library != Library::null());
|
|
WriteObjectImpl(library->ptr()->url_, kAsInlinedObject);
|
|
WriteObjectImpl(cls->ptr()->name_, kAsInlinedObject);
|
|
WriteObjectImpl(func->ptr()->name_, kAsInlinedObject);
|
|
}
|
|
|
|
void SnapshotWriter::ArrayWriteTo(intptr_t object_id,
|
|
intptr_t array_kind,
|
|
intptr_t tags,
|
|
RawSmi* length,
|
|
RawTypeArguments* type_arguments,
|
|
RawObject* data[],
|
|
bool as_reference) {
|
|
if (as_reference) {
|
|
// Write out the serialization header value for this object.
|
|
WriteInlinedObjectHeader(kOmittedObjectId);
|
|
|
|
// Write out the class information.
|
|
WriteIndexedObject(array_kind);
|
|
WriteTags(tags);
|
|
|
|
// Write out the length field.
|
|
Write<RawObject*>(length);
|
|
} else {
|
|
intptr_t len = Smi::Value(length);
|
|
|
|
// Write out the serialization header value for this object.
|
|
WriteInlinedObjectHeader(object_id);
|
|
|
|
// Write out the class and tags information.
|
|
WriteIndexedObject(array_kind);
|
|
WriteTags(tags);
|
|
|
|
// Write out the length field.
|
|
Write<RawObject*>(length);
|
|
|
|
// Write out the type arguments.
|
|
WriteObjectImpl(type_arguments, kAsInlinedObject);
|
|
|
|
// Write out the individual object ids.
|
|
bool write_as_reference = RawObject::IsCanonical(tags) ? false : true;
|
|
for (intptr_t i = 0; i < len; i++) {
|
|
WriteObjectImpl(data[i], write_as_reference);
|
|
}
|
|
}
|
|
}
|
|
|
|
RawFunction* SnapshotWriter::IsSerializableClosure(RawClosure* closure) {
|
|
// Extract the function object to check if this closure
|
|
// can be sent in an isolate message.
|
|
RawFunction* func = closure->ptr()->function_;
|
|
// We only allow closure of top level methods or static functions in a
|
|
// class to be sent in isolate messages.
|
|
if (can_send_any_object() &&
|
|
Function::IsImplicitStaticClosureFunction(func)) {
|
|
return func;
|
|
}
|
|
// Not a closure of a top level method or static function, throw an
|
|
// exception as we do not allow these objects to be serialized.
|
|
HANDLESCOPE(thread());
|
|
|
|
const Function& errorFunc = Function::Handle(zone(), func);
|
|
ASSERT(!errorFunc.IsNull());
|
|
|
|
// All other closures are errors.
|
|
char* chars = OS::SCreate(
|
|
thread()->zone(),
|
|
"Illegal argument in isolate message : (object is a closure - %s)",
|
|
errorFunc.ToCString());
|
|
SetWriteException(Exceptions::kArgument, chars);
|
|
return Function::null();
|
|
}
|
|
|
|
RawClass* SnapshotWriter::GetFunctionOwner(RawFunction* func) {
|
|
RawObject* owner = func->ptr()->owner_;
|
|
uint32_t tags = GetObjectTags(owner);
|
|
intptr_t class_id = RawObject::ClassIdTag::decode(tags);
|
|
if (class_id == kClassCid) {
|
|
return reinterpret_cast<RawClass*>(owner);
|
|
}
|
|
ASSERT(class_id == kPatchClassCid);
|
|
return reinterpret_cast<RawPatchClass*>(owner)->ptr()->patched_class_;
|
|
}
|
|
|
|
void SnapshotWriter::CheckForNativeFields(RawClass* cls) {
|
|
if (cls->ptr()->num_native_fields_ != 0) {
|
|
// We do not allow objects with native fields in an isolate message.
|
|
HANDLESCOPE(thread());
|
|
const Class& clazz = Class::Handle(zone(), cls);
|
|
char* chars = OS::SCreate(thread()->zone(),
|
|
"Illegal argument in isolate message"
|
|
" : (object extends NativeWrapper - %s)",
|
|
clazz.ToCString());
|
|
SetWriteException(Exceptions::kArgument, chars);
|
|
}
|
|
}
|
|
|
|
void SnapshotWriter::SetWriteException(Exceptions::ExceptionType type,
|
|
const char* msg) {
|
|
set_exception_type(type);
|
|
set_exception_msg(msg);
|
|
// The more specific error is set up in SnapshotWriter::ThrowException().
|
|
thread()->long_jump_base()->Jump(1, Object::snapshot_writer_error());
|
|
}
|
|
|
|
void SnapshotWriter::WriteInstance(RawObject* raw,
|
|
RawClass* cls,
|
|
intptr_t tags,
|
|
intptr_t object_id,
|
|
bool as_reference) {
|
|
// Closure instances are handled by RawClosure::WriteTo().
|
|
ASSERT(!Class::IsClosureClass(cls));
|
|
|
|
// Check if the instance has native fields and throw an exception if it does.
|
|
CheckForNativeFields(cls);
|
|
|
|
// Object is regular dart instance.
|
|
if (as_reference) {
|
|
// Write out the serialization header value for this object.
|
|
WriteInlinedObjectHeader(kOmittedObjectId);
|
|
|
|
// Indicate this is an instance object.
|
|
Write<int32_t>(SerializedHeaderData::encode(kInstanceObjectId));
|
|
WriteTags(tags);
|
|
|
|
// Write out the class information for this object.
|
|
WriteObjectImpl(cls, kAsInlinedObject);
|
|
} else {
|
|
intptr_t next_field_offset = cls->ptr()->next_field_offset_in_words_
|
|
<< kWordSizeLog2;
|
|
ASSERT(next_field_offset > 0);
|
|
|
|
// Write out the serialization header value for this object.
|
|
WriteInlinedObjectHeader(object_id);
|
|
|
|
// Indicate this is an instance object.
|
|
Write<int32_t>(SerializedHeaderData::encode(kInstanceObjectId));
|
|
|
|
// Write out the tags.
|
|
WriteTags(tags);
|
|
|
|
// Write out the class information for this object.
|
|
WriteObjectImpl(cls, kAsInlinedObject);
|
|
|
|
// Write out all the fields for the object.
|
|
// Instance::NextFieldOffset() returns the offset of the first field in
|
|
// a Dart object.
|
|
bool write_as_reference = RawObject::IsCanonical(tags) ? false : true;
|
|
intptr_t offset = Instance::NextFieldOffset();
|
|
while (offset < next_field_offset) {
|
|
RawObject* raw_obj = *reinterpret_cast<RawObject**>(
|
|
reinterpret_cast<uword>(raw->ptr()) + offset);
|
|
WriteObjectImpl(raw_obj, write_as_reference);
|
|
offset += kWordSize;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
bool SnapshotWriter::AllowObjectsInDartLibrary(RawLibrary* library) {
|
|
return (library == object_store()->collection_library() ||
|
|
library == object_store()->core_library() ||
|
|
library == object_store()->typed_data_library());
|
|
}
|
|
|
|
intptr_t SnapshotWriter::FindVmSnapshotObject(RawObject* rawobj) {
|
|
intptr_t length = Object::vm_isolate_snapshot_object_table().Length();
|
|
for (intptr_t i = 0; i < length; i++) {
|
|
if (Object::vm_isolate_snapshot_object_table().At(i) == rawobj) {
|
|
return (i + kMaxPredefinedObjectIds);
|
|
}
|
|
}
|
|
return kInvalidIndex;
|
|
}
|
|
|
|
void SnapshotWriter::ThrowException(Exceptions::ExceptionType type,
|
|
const char* msg) {
|
|
thread()->clear_sticky_error();
|
|
if (msg != NULL) {
|
|
const String& msg_obj = String::Handle(String::New(msg));
|
|
const Array& args = Array::Handle(Array::New(1));
|
|
args.SetAt(0, msg_obj);
|
|
Exceptions::ThrowByType(type, args);
|
|
} else {
|
|
Exceptions::ThrowByType(type, Object::empty_array());
|
|
}
|
|
UNREACHABLE();
|
|
}
|
|
|
|
void SnapshotWriter::WriteVersionAndFeatures() {
|
|
const char* expected_version = Version::SnapshotString();
|
|
ASSERT(expected_version != NULL);
|
|
const intptr_t version_len = strlen(expected_version);
|
|
WriteBytes(reinterpret_cast<const uint8_t*>(expected_version), version_len);
|
|
|
|
const char* expected_features =
|
|
Dart::FeaturesString(Isolate::Current(), kind_);
|
|
ASSERT(expected_features != NULL);
|
|
const intptr_t features_len = strlen(expected_features);
|
|
WriteBytes(reinterpret_cast<const uint8_t*>(expected_features),
|
|
features_len + 1);
|
|
free(const_cast<char*>(expected_features));
|
|
}
|
|
|
|
ScriptSnapshotWriter::ScriptSnapshotWriter(uint8_t** buffer, ReAlloc alloc)
|
|
: SnapshotWriter(Thread::Current(),
|
|
Snapshot::kScript,
|
|
buffer,
|
|
alloc,
|
|
NULL,
|
|
kInitialSize,
|
|
&forward_list_,
|
|
true /* can_send_any_object */),
|
|
forward_list_(thread(), kMaxPredefinedObjectIds) {
|
|
ASSERT(buffer != NULL);
|
|
ASSERT(alloc != NULL);
|
|
}
|
|
|
|
void ScriptSnapshotWriter::WriteScriptSnapshot(const Library& lib) {
|
|
ASSERT(kind() == Snapshot::kScript);
|
|
ASSERT(isolate() != NULL);
|
|
ASSERT(ClassFinalizer::AllClassesFinalized());
|
|
|
|
// Setup for long jump in case there is an exception while writing
|
|
// the snapshot.
|
|
LongJumpScope jump;
|
|
if (setjmp(*jump.Set()) == 0) {
|
|
// Reserve space in the output buffer for a snapshot header.
|
|
ReserveHeader();
|
|
|
|
// Write out the version string.
|
|
WriteVersionAndFeatures();
|
|
|
|
// Write out the library object.
|
|
{
|
|
NoSafepointScope no_safepoint;
|
|
|
|
// Write out the library object.
|
|
WriteObject(lib.raw());
|
|
|
|
FillHeader(kind());
|
|
}
|
|
} else {
|
|
ThrowException(exception_type(), exception_msg());
|
|
}
|
|
}
|
|
|
|
void SnapshotWriterVisitor::VisitPointers(RawObject** first, RawObject** last) {
|
|
ASSERT(Utils::IsAligned(first, sizeof(*first)));
|
|
ASSERT(Utils::IsAligned(last, sizeof(*last)));
|
|
for (RawObject** current = first; current <= last; current++) {
|
|
RawObject* raw_obj = *current;
|
|
writer_->WriteObjectImpl(raw_obj, as_references_);
|
|
}
|
|
}
|
|
|
|
MessageWriter::MessageWriter(uint8_t** buffer,
|
|
ReAlloc alloc,
|
|
DeAlloc dealloc,
|
|
bool can_send_any_object,
|
|
intptr_t* buffer_len)
|
|
: SnapshotWriter(Thread::Current(),
|
|
Snapshot::kMessage,
|
|
buffer,
|
|
alloc,
|
|
dealloc,
|
|
kInitialSize,
|
|
&forward_list_,
|
|
can_send_any_object),
|
|
forward_list_(thread(), kMaxPredefinedObjectIds),
|
|
buffer_len_(buffer_len) {
|
|
ASSERT(buffer != NULL);
|
|
ASSERT(alloc != NULL);
|
|
}
|
|
|
|
void MessageWriter::WriteMessage(const Object& obj) {
|
|
ASSERT(kind() == Snapshot::kMessage);
|
|
ASSERT(isolate() != NULL);
|
|
|
|
// Setup for long jump in case there is an exception while writing
|
|
// the message.
|
|
LongJumpScope jump;
|
|
if (setjmp(*jump.Set()) == 0) {
|
|
NoSafepointScope no_safepoint;
|
|
WriteObject(obj.raw());
|
|
if (buffer_len_ != NULL) {
|
|
*buffer_len_ = BytesWritten();
|
|
}
|
|
} else {
|
|
FreeBuffer();
|
|
ThrowException(exception_type(), exception_msg());
|
|
}
|
|
}
|
|
|
|
} // namespace dart
|