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47236d71e50bf7548e94de28b1767da63e0a8d3d
sdk/runtime/vm/snapshot.cc
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asiva@google.com ca1c3241c4 Fix for issue 21398. 
Accept only 'literal-like' objects when sending messages to isolates
spawned using spawnURI. Allow all objects for isolates spawned using
spawnFunction.

R=iposva@google.com

Review URL: https://codereview.chromium.org//834233003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42793 260f80e4-7a28-3924-810f-c04153c831b5
2015-01-12 23:14:30 +00:00

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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/snapshot.h"
#include "platform/assert.h"
#include "vm/bootstrap.h"
#include "vm/class_finalizer.h"
#include "vm/exceptions.h"
#include "vm/heap.h"
#include "vm/lockers.h"
#include "vm/longjump.h"
#include "vm/object.h"
#include "vm/object_store.h"
#include "vm/snapshot_ids.h"
#include "vm/symbols.h"
#include "vm/verified_memory.h"
#include "vm/version.h"
namespace dart {
static const int kNumInitialReferencesInFullSnapshot = 160 * KB;
static const int kNumInitialReferences = 64;
static bool IsSingletonClassId(intptr_t class_id) {
// Check if this is a singleton object class which is shared by all isolates.
return ((class_id >= kClassCid && class_id <= kUnwindErrorCid) ||
(class_id >= kNullCid && class_id <= kVoidCid));
}
static bool IsObjectStoreClassId(intptr_t class_id) {
// Check if this is a class which is stored in the object store.
return (class_id == kObjectCid ||
(class_id >= kInstanceCid && class_id <= kUserTagCid) ||
class_id == kArrayCid || class_id == kImmutableArrayCid ||
RawObject::IsStringClassId(class_id) ||
RawObject::IsTypedDataClassId(class_id) ||
RawObject::IsExternalTypedDataClassId(class_id) ||
class_id == kNullCid);
}
static bool IsObjectStoreTypeId(intptr_t index) {
// Check if this is a type which is stored in the object store.
return (index >= kObjectType && index <= kArrayType);
}
static bool IsSplitClassId(intptr_t class_id) {
// Return whether this class is serialized in two steps: first a reference,
// with sufficient information to allocate a correctly sized object, and then
// later inline with complete contents.
return class_id >= kNumPredefinedCids ||
class_id == kArrayCid ||
class_id == kImmutableArrayCid ||
RawObject::IsImplicitFieldClassId(class_id);
}
static intptr_t ClassIdFromObjectId(intptr_t object_id) {
ASSERT(object_id > kClassIdsOffset);
intptr_t class_id = (object_id - kClassIdsOffset);
return class_id;
}
static intptr_t ObjectIdFromClassId(intptr_t class_id) {
ASSERT((class_id > kIllegalCid) && (class_id < kNumPredefinedCids));
ASSERT(!(RawObject::IsImplicitFieldClassId(class_id)));
return (class_id + kClassIdsOffset);
}
static RawType* GetType(ObjectStore* object_store, intptr_t index) {
switch (index) {
case kObjectType: return object_store->object_type();
case kNullType: return object_store->null_type();
case kFunctionType: return object_store->function_type();
case kNumberType: return object_store->number_type();
case kSmiType: return object_store->smi_type();
case kMintType: return object_store->mint_type();
case kDoubleType: return object_store->double_type();
case kIntType: return object_store->int_type();
case kBoolType: return object_store->bool_type();
case kStringType: return object_store->string_type();
case kArrayType: return object_store->array_type();
default: break;
}
UNREACHABLE();
return Type::null();
}
static intptr_t GetTypeIndex(
ObjectStore* object_store, const RawType* raw_type) {
ASSERT(raw_type->IsHeapObject());
if (raw_type == object_store->object_type()) {
return kObjectType;
} else if (raw_type == object_store->null_type()) {
return kNullType;
} else if (raw_type == object_store->function_type()) {
return kFunctionType;
} else if (raw_type == object_store->number_type()) {
return kNumberType;
} else if (raw_type == object_store->smi_type()) {
return kSmiType;
} else if (raw_type == object_store->mint_type()) {
return kMintType;
} else if (raw_type == object_store->double_type()) {
return kDoubleType;
} else if (raw_type == object_store->int_type()) {
return kIntType;
} else if (raw_type == object_store->bool_type()) {
return kBoolType;
} else if (raw_type == object_store->string_type()) {
return kStringType;
} else if (raw_type == object_store->array_type()) {
return kArrayType;
}
return kInvalidIndex;
}
// TODO(5411462): Temporary setup of snapshot for testing purposes,
// the actual creation of a snapshot maybe done differently.
const Snapshot* Snapshot::SetupFromBuffer(const void* raw_memory) {
ASSERT(raw_memory != NULL);
ASSERT(kHeaderSize == sizeof(Snapshot));
ASSERT(kLengthIndex == length_offset());
ASSERT((kSnapshotFlagIndex * sizeof(int64_t)) == kind_offset());
ASSERT((kHeapObjectTag & kInlined));
// The kWatchedBit and kMarkBit are only set during GC operations. This
// allows the two low bits in the header to be used for snapshotting.
ASSERT(kObjectId ==
((1 << RawObject::kWatchedBit) | (1 << RawObject::kMarkBit)));
ASSERT((kObjectAlignmentMask & kObjectId) == kObjectId);
const Snapshot* snapshot = reinterpret_cast<const Snapshot*>(raw_memory);
// If the raw length is negative or greater than what the local machine can
// handle, then signal an error.
int64_t snapshot_length = ReadUnaligned(&snapshot->unaligned_length_);
if ((snapshot_length < 0) || (snapshot_length > kIntptrMax)) {
return NULL;
}
return snapshot;
}
RawSmi* BaseReader::ReadAsSmi() {
intptr_t value = Read<int32_t>();
ASSERT((value & kSmiTagMask) == kSmiTag);
return reinterpret_cast<RawSmi*>(value);
}
intptr_t BaseReader::ReadSmiValue() {
return Smi::Value(ReadAsSmi());
}
SnapshotReader::SnapshotReader(const uint8_t* buffer,
intptr_t size,
Snapshot::Kind kind,
Isolate* isolate)
: BaseReader(buffer, size),
kind_(kind),
isolate_(isolate),
heap_(isolate->heap()),
old_space_(isolate->heap()->old_space()),
cls_(Class::Handle(isolate)),
obj_(Object::Handle(isolate)),
pobj_(PassiveObject::Handle(isolate)),
array_(Array::Handle(isolate)),
field_(Field::Handle(isolate)),
str_(String::Handle(isolate)),
library_(Library::Handle(isolate)),
type_(AbstractType::Handle(isolate)),
type_arguments_(TypeArguments::Handle(isolate)),
tokens_(Array::Handle(isolate)),
stream_(TokenStream::Handle(isolate)),
data_(ExternalTypedData::Handle(isolate)),
error_(UnhandledException::Handle(isolate)),
backward_references_((kind == Snapshot::kFull) ?
kNumInitialReferencesInFullSnapshot :
kNumInitialReferences) {
}
RawObject* SnapshotReader::ReadObject() {
// Setup for long jump in case there is an exception while reading.
LongJumpScope jump;
if (setjmp(*jump.Set()) == 0) {
PassiveObject& obj = PassiveObject::Handle(isolate(), ReadObjectImpl());
for (intptr_t i = 0; i < backward_references_.length(); i++) {
if (!backward_references_[i].is_deserialized()) {
ReadObjectImpl();
backward_references_[i].set_state(kIsDeserialized);
}
}
return obj.raw();
} else {
// An error occurred while reading, return the error object.
const Error& err = Error::Handle(isolate()->object_store()->sticky_error());
isolate()->object_store()->clear_sticky_error();
return err.raw();
}
}
RawClass* SnapshotReader::ReadClassId(intptr_t object_id) {
ASSERT(kind_ != Snapshot::kFull);
// Read the class header information and lookup the class.
intptr_t class_header = Read<int32_t>();
ASSERT((class_header & kSmiTagMask) != kSmiTag);
ASSERT(!IsVMIsolateObject(class_header) ||
!IsSingletonClassId(GetVMIsolateObjectId(class_header)));
ASSERT((SerializedHeaderTag::decode(class_header) != kObjectId) ||
!IsObjectStoreClassId(SerializedHeaderData::decode(class_header)));
Class& cls = Class::ZoneHandle(isolate(), Class::null());
AddBackRef(object_id, &cls, kIsDeserialized);
// Read the library/class information and lookup the class.
str_ ^= ReadObjectImpl(class_header);
library_ = Library::LookupLibrary(str_);
ASSERT(!library_.IsNull());
str_ ^= ReadObjectImpl();
cls = library_.LookupClass(str_);
cls.EnsureIsFinalized(isolate());
ASSERT(!cls.IsNull());
return cls.raw();
}
RawObject* SnapshotReader::ReadObjectImpl() {
int64_t value = Read<int64_t>();
if ((value & kSmiTagMask) == kSmiTag) {
return NewInteger(value);
}
ASSERT((value <= kIntptrMax) && (value >= kIntptrMin));
return ReadObjectImpl(static_cast<intptr_t>(value));
}
intptr_t SnapshotReader::NextAvailableObjectId() const {
return backward_references_.length() + kMaxPredefinedObjectIds;
}
RawObject* SnapshotReader::ReadObjectImpl(intptr_t header_value) {
if (IsVMIsolateObject(header_value)) {
return ReadVMIsolateObject(header_value);
} else {
if (SerializedHeaderTag::decode(header_value) == kObjectId) {
return ReadIndexedObject(SerializedHeaderData::decode(header_value));
}
ASSERT(SerializedHeaderTag::decode(header_value) == kInlined);
intptr_t object_id = SerializedHeaderData::decode(header_value);
if (object_id == kOmittedObjectId) {
object_id = NextAvailableObjectId();
}
return ReadInlinedObject(object_id);
}
}
RawObject* SnapshotReader::ReadObjectRef() {
int64_t header_value = Read<int64_t>();
if ((header_value & kSmiTagMask) == kSmiTag) {
return NewInteger(header_value);
}
ASSERT((header_value <= kIntptrMax) && (header_value >= kIntptrMin));
intptr_t value = static_cast<intptr_t>(header_value);
if (IsVMIsolateObject(value)) {
return ReadVMIsolateObject(value);
} else if (SerializedHeaderTag::decode(value) == kObjectId) {
return ReadIndexedObject(SerializedHeaderData::decode(value));
}
ASSERT(SerializedHeaderTag::decode(value) == kInlined);
intptr_t object_id = SerializedHeaderData::decode(value);
if (object_id == kOmittedObjectId) {
object_id = NextAvailableObjectId();
}
ASSERT(GetBackRef(object_id) == NULL);
// Read the class header information and lookup the class.
intptr_t class_header = Read<int32_t>();
// Since we are only reading an object reference, If it is an instance kind
// then we only need to figure out the class of the object and allocate an
// instance of it. The individual fields will be read later.
if (SerializedHeaderData::decode(class_header) == kInstanceObjectId) {
Instance& result = Instance::ZoneHandle(isolate(), Instance::null());
AddBackRef(object_id, &result, kIsNotDeserialized);
cls_ ^= ReadObjectImpl(); // Read class information.
ASSERT(!cls_.IsNull());
intptr_t instance_size = cls_.instance_size();
ASSERT(instance_size > 0);
if (kind_ == Snapshot::kFull) {
result ^= AllocateUninitialized(cls_.id(), instance_size);
} else {
result ^= Object::Allocate(cls_.id(), instance_size, HEAP_SPACE(kind_));
}
return result.raw();
}
ASSERT((class_header & kSmiTagMask) != kSmiTag);
// Similarly Array and ImmutableArray objects are also similarly only
// allocated here, the individual array elements are read later.
intptr_t class_id = LookupInternalClass(class_header);
if (class_id == kArrayCid) {
// Read the length and allocate an object based on the len.
intptr_t len = ReadSmiValue();
Array& array = Array::ZoneHandle(
isolate(),
((kind_ == Snapshot::kFull) ?
NewArray(len) : Array::New(len, HEAP_SPACE(kind_))));
AddBackRef(object_id, &array, kIsNotDeserialized);
return array.raw();
}
if (class_id == kImmutableArrayCid) {
// Read the length and allocate an object based on the len.
intptr_t len = ReadSmiValue();
Array& array = Array::ZoneHandle(
isolate(),
(kind_ == Snapshot::kFull) ?
NewImmutableArray(len) : ImmutableArray::New(len, HEAP_SPACE(kind_)));
AddBackRef(object_id, &array, kIsNotDeserialized);
return array.raw();
}
// For all other internal VM classes we read the object inline.
intptr_t tags = ReadTags();
switch (class_id) {
#define SNAPSHOT_READ(clazz) \
case clazz::kClassId: { \
pobj_ = clazz::ReadFrom(this, object_id, tags, kind_); \
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_);
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_);
break;
}
#undef SNAPSHOT_READ
default: UNREACHABLE(); break;
}
if (kind_ == Snapshot::kFull) {
pobj_.SetCreatedFromSnapshot();
}
return pobj_.raw();
}
void SnapshotReader::AddBackRef(intptr_t id,
Object* obj,
DeserializeState state) {
intptr_t index = (id - kMaxPredefinedObjectIds);
ASSERT(index == backward_references_.length());
BackRefNode node(obj, state);
backward_references_.Add(node);
}
Object* SnapshotReader::GetBackRef(intptr_t id) {
ASSERT(id >= kMaxPredefinedObjectIds);
intptr_t index = (id - kMaxPredefinedObjectIds);
if (index < backward_references_.length()) {
return backward_references_[index].reference();
}
return NULL;
}
class HeapLocker : public StackResource {
public:
HeapLocker(Isolate* isolate, PageSpace* page_space)
: StackResource(isolate), page_space_(page_space) {
page_space_->AcquireDataLock();
}
~HeapLocker() {
page_space_->ReleaseDataLock();
}
private:
PageSpace* page_space_;
};
RawApiError* SnapshotReader::ReadFullSnapshot() {
ASSERT(kind_ == Snapshot::kFull);
Isolate* isolate = Isolate::Current();
ASSERT(isolate != NULL);
ObjectStore* object_store = isolate->object_store();
ASSERT(object_store != NULL);
// First read the version string, and check that it matches.
RawApiError* error = VerifyVersion();
if (error != ApiError::null()) {
return error;
}
// The version string matches. Read the rest of the snapshot.
// TODO(asiva): Add a check here to ensure we have the right heap
// size for the full snapshot being read.
{
NoGCScope no_gc;
HeapLocker hl(isolate, old_space());
// Read in all the objects stored in the object store.
intptr_t num_flds = (object_store->to() - object_store->from());
for (intptr_t i = 0; i <= num_flds; i++) {
*(object_store->from() + i) = ReadObjectImpl();
}
for (intptr_t i = 0; i < backward_references_.length(); i++) {
if (!backward_references_[i].is_deserialized()) {
ReadObjectImpl();
backward_references_[i].set_state(kIsDeserialized);
}
}
// Validate the class table.
#if defined(DEBUG)
isolate->ValidateClassTable();
#endif
// Setup native resolver for bootstrap impl.
Bootstrap::SetupNativeResolver();
return ApiError::null();
}
}
RawObject* SnapshotReader::ReadScriptSnapshot() {
ASSERT(kind_ == Snapshot::kScript);
// First read the version string, and check that it matches.
RawApiError* error = VerifyVersion();
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::VerifyVersion() {
// 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'",
Version::SnapshotString());
const String& msg = String::Handle(String::New(message_buffer));
return ApiError::New(msg);
}
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'",
(kind_ == Snapshot::kFull) ? "full" : "script",
Version::SnapshotString(),
actual_version);
free(actual_version);
const String& msg = String::Handle(String::New(message_buffer));
return ApiError::New(msg);
}
Advance(version_len);
return ApiError::null();
}
#define ALLOC_NEW_OBJECT_WITH_LEN(type, length) \
ASSERT(kind_ == Snapshot::kFull); \
ASSERT(isolate()->no_gc_scope_depth() != 0); \
Raw##type* obj = reinterpret_cast<Raw##type*>( \
AllocateUninitialized(k##type##Cid, type::InstanceSize(length))); \
obj->StoreSmi(&(obj->ptr()->length_), Smi::New(length)); \
return obj; \
RawArray* SnapshotReader::NewArray(intptr_t len) {
ALLOC_NEW_OBJECT_WITH_LEN(Array, len);
}
RawImmutableArray* SnapshotReader::NewImmutableArray(intptr_t len) {
ALLOC_NEW_OBJECT_WITH_LEN(ImmutableArray, len);
}
RawOneByteString* SnapshotReader::NewOneByteString(intptr_t len) {
ALLOC_NEW_OBJECT_WITH_LEN(OneByteString, len);
}
RawTwoByteString* SnapshotReader::NewTwoByteString(intptr_t len) {
ALLOC_NEW_OBJECT_WITH_LEN(TwoByteString, len);
}
RawTypeArguments* SnapshotReader::NewTypeArguments(intptr_t len) {
ALLOC_NEW_OBJECT_WITH_LEN(TypeArguments, len);
}
RawTokenStream* SnapshotReader::NewTokenStream(intptr_t len) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
stream_ = reinterpret_cast<RawTokenStream*>(
AllocateUninitialized(kTokenStreamCid, TokenStream::InstanceSize()));
uint8_t* array = const_cast<uint8_t*>(CurrentBufferAddress());
ASSERT(array != NULL);
Advance(len);
data_ = reinterpret_cast<RawExternalTypedData*>(
AllocateUninitialized(kExternalTypedDataUint8ArrayCid,
ExternalTypedData::InstanceSize()));
data_.SetData(array);
data_.SetLength(len);
stream_.SetStream(data_);
return stream_.raw();
}
RawContext* SnapshotReader::NewContext(intptr_t num_variables) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
RawContext* obj = reinterpret_cast<RawContext*>(
AllocateUninitialized(kContextCid, Context::InstanceSize(num_variables)));
obj->ptr()->num_variables_ = num_variables;
return obj;
}
RawClass* SnapshotReader::NewClass(intptr_t class_id) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
if (class_id < kNumPredefinedCids) {
ASSERT((class_id >= kInstanceCid) &&
(class_id <= kNullCid));
return isolate()->class_table()->At(class_id);
}
RawClass* obj = reinterpret_cast<RawClass*>(
AllocateUninitialized(kClassCid, Class::InstanceSize()));
Instance fake;
obj->ptr()->handle_vtable_ = fake.vtable();
cls_ = obj;
cls_.set_id(class_id);
isolate()->RegisterClassAt(class_id, cls_);
return cls_.raw();
}
RawInstance* SnapshotReader::NewInstance() {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
RawInstance* obj = reinterpret_cast<RawInstance*>(
AllocateUninitialized(kObjectCid, Instance::InstanceSize()));
return obj;
}
RawMint* SnapshotReader::NewMint(int64_t value) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
RawMint* obj = reinterpret_cast<RawMint*>(
AllocateUninitialized(kMintCid, Mint::InstanceSize()));
obj->ptr()->value_ = value;
return obj;
}
RawDouble* SnapshotReader::NewDouble(double value) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
RawDouble* obj = reinterpret_cast<RawDouble*>(
AllocateUninitialized(kDoubleCid, Double::InstanceSize()));
obj->ptr()->value_ = value;
return obj;
}
RawTypedData* SnapshotReader::NewTypedData(intptr_t class_id, intptr_t len) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
const intptr_t lengthInBytes = len * TypedData::ElementSizeInBytes(class_id);
RawTypedData* obj = reinterpret_cast<RawTypedData*>(
AllocateUninitialized(class_id, TypedData::InstanceSize(lengthInBytes)));
obj->StoreSmi(&(obj->ptr()->length_), Smi::New(len));
return obj;
}
#define ALLOC_NEW_OBJECT(type) \
ASSERT(kind_ == Snapshot::kFull); \
ASSERT(isolate()->no_gc_scope_depth() != 0); \
return reinterpret_cast<Raw##type*>( \
AllocateUninitialized(k##type##Cid, type::InstanceSize())); \
RawBigint* SnapshotReader::NewBigint() {
ALLOC_NEW_OBJECT(Bigint);
}
RawUnresolvedClass* SnapshotReader::NewUnresolvedClass() {
ALLOC_NEW_OBJECT(UnresolvedClass);
}
RawType* SnapshotReader::NewType() {
ALLOC_NEW_OBJECT(Type);
}
RawTypeRef* SnapshotReader::NewTypeRef() {
ALLOC_NEW_OBJECT(TypeRef);
}
RawTypeParameter* SnapshotReader::NewTypeParameter() {
ALLOC_NEW_OBJECT(TypeParameter);
}
RawBoundedType* SnapshotReader::NewBoundedType() {
ALLOC_NEW_OBJECT(BoundedType);
}
RawMixinAppType* SnapshotReader::NewMixinAppType() {
ALLOC_NEW_OBJECT(MixinAppType);
}
RawPatchClass* SnapshotReader::NewPatchClass() {
ALLOC_NEW_OBJECT(PatchClass);
}
RawClosureData* SnapshotReader::NewClosureData() {
ALLOC_NEW_OBJECT(ClosureData);
}
RawRedirectionData* SnapshotReader::NewRedirectionData() {
ALLOC_NEW_OBJECT(RedirectionData);
}
RawFunction* SnapshotReader::NewFunction() {
ALLOC_NEW_OBJECT(Function);
}
RawField* SnapshotReader::NewField() {
ALLOC_NEW_OBJECT(Field);
}
RawLibrary* SnapshotReader::NewLibrary() {
ALLOC_NEW_OBJECT(Library);
}
RawLibraryPrefix* SnapshotReader::NewLibraryPrefix() {
ALLOC_NEW_OBJECT(LibraryPrefix);
}
RawNamespace* SnapshotReader::NewNamespace() {
ALLOC_NEW_OBJECT(Namespace);
}
RawScript* SnapshotReader::NewScript() {
ALLOC_NEW_OBJECT(Script);
}
RawLiteralToken* SnapshotReader::NewLiteralToken() {
ALLOC_NEW_OBJECT(LiteralToken);
}
RawGrowableObjectArray* SnapshotReader::NewGrowableObjectArray() {
ALLOC_NEW_OBJECT(GrowableObjectArray);
}
RawFloat32x4* SnapshotReader::NewFloat32x4(float v0, float v1, float v2,
float v3) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
RawFloat32x4* obj = reinterpret_cast<RawFloat32x4*>(
AllocateUninitialized(kFloat32x4Cid, Float32x4::InstanceSize()));
obj->ptr()->value_[0] = v0;
obj->ptr()->value_[1] = v1;
obj->ptr()->value_[2] = v2;
obj->ptr()->value_[3] = v3;
return obj;
}
RawInt32x4* SnapshotReader::NewInt32x4(uint32_t v0, uint32_t v1, uint32_t v2,
uint32_t v3) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
RawInt32x4* obj = reinterpret_cast<RawInt32x4*>(
AllocateUninitialized(kInt32x4Cid, Int32x4::InstanceSize()));
obj->ptr()->value_[0] = v0;
obj->ptr()->value_[1] = v1;
obj->ptr()->value_[2] = v2;
obj->ptr()->value_[3] = v3;
return obj;
}
RawFloat64x2* SnapshotReader::NewFloat64x2(double v0, double v1) {
ASSERT(kind_ == Snapshot::kFull);
ASSERT(isolate()->no_gc_scope_depth() != 0);
RawFloat64x2* obj = reinterpret_cast<RawFloat64x2*>(
AllocateUninitialized(kFloat64x2Cid, Float64x2::InstanceSize()));
obj->ptr()->value_[0] = v0;
obj->ptr()->value_[1] = v1;
return obj;
}
RawApiError* SnapshotReader::NewApiError() {
ALLOC_NEW_OBJECT(ApiError);
}
RawLanguageError* SnapshotReader::NewLanguageError() {
ALLOC_NEW_OBJECT(LanguageError);
}
RawUnhandledException* SnapshotReader::NewUnhandledException() {
ALLOC_NEW_OBJECT(UnhandledException);
}
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));
}
if (kind_ == Snapshot::kFull) {
return NewMint(value);
}
return Mint::NewCanonical(value);
}
RawStacktrace* SnapshotReader::NewStacktrace() {
ALLOC_NEW_OBJECT(Stacktrace);
}
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));
return class_id;
}
RawObject* SnapshotReader::AllocateUninitialized(intptr_t class_id,
intptr_t size) {
ASSERT(isolate()->no_gc_scope_depth() != 0);
ASSERT(Utils::IsAligned(size, kObjectAlignment));
// Allocate memory where all words look like smis. This is currently
// only needed for DEBUG-mode validation in StorePointer/StoreSmi, but will
// be essential with the upcoming deletion barrier.
uword address =
old_space()->TryAllocateSmiInitializedLocked(size,
PageSpace::kForceGrowth);
if (address == 0) {
// Use the preallocated out of memory exception to avoid calling
// into dart code or allocating any code.
// We do a longjmp at this point to unwind out of the entire
// read part and return the error object back.
const UnhandledException& error = UnhandledException::Handle(
object_store()->preallocated_unhandled_exception());
Isolate::Current()->long_jump_base()->Jump(1, error);
}
VerifiedMemory::Accept(address, size);
RawObject* raw_obj = reinterpret_cast<RawObject*>(address + kHeapObjectTag);
uword tags = 0;
ASSERT(class_id != kIllegalCid);
tags = RawObject::ClassIdTag::update(class_id, tags);
tags = RawObject::SizeTag::update(size, tags);
raw_obj->ptr()->tags_ = tags;
return raw_obj;
}
RawObject* SnapshotReader::ReadVMIsolateObject(intptr_t header_value) {
intptr_t object_id = GetVMIsolateObjectId(header_value);
if (object_id == kNullObject) {
// This is a singleton null object, return it.
return Object::null();
}
if (object_id == kSentinelObject) {
return Object::sentinel().raw();
}
if (object_id == kEmptyArrayObject) {
return Object::empty_array().raw();
}
if (object_id == kZeroArrayObject) {
return Object::zero_array().raw();
}
if (object_id == kDynamicType) {
return Object::dynamic_type();
}
if (object_id == kVoidType) {
return Object::void_type();
}
if (object_id == kTrueValue) {
return Bool::True().raw();
}
if (object_id == kFalseValue) {
return Bool::False().raw();
}
if (object_id == kDoubleObject) {
ASSERT(kind_ == Snapshot::kMessage);
return Double::New(ReadDouble());
}
intptr_t class_id = ClassIdFromObjectId(object_id);
if (IsSingletonClassId(class_id)) {
return isolate()->class_table()->At(class_id); // get singleton class.
} else {
ASSERT(Symbols::IsVMSymbolId(object_id));
return Symbols::GetVMSymbol(object_id); // return VM symbol.
}
UNREACHABLE();
return Object::null();
}
RawObject* SnapshotReader::ReadIndexedObject(intptr_t object_id) {
intptr_t class_id = ClassIdFromObjectId(object_id);
if (IsObjectStoreClassId(class_id)) {
return isolate()->class_table()->At(class_id); // get singleton class.
}
if (kind_ != Snapshot::kFull) {
if (IsObjectStoreTypeId(object_id)) {
return GetType(object_store(), object_id); // return type obj.
}
}
Object* object = GetBackRef(object_id);
return object->raw();
}
RawObject* SnapshotReader::ReadInlinedObject(intptr_t object_id) {
// Read the class header information and lookup the class.
intptr_t class_header = Read<int32_t>();
intptr_t tags = ReadTags();
if (SerializedHeaderData::decode(class_header) == kInstanceObjectId) {
// Object is regular dart instance.
Instance* result = reinterpret_cast<Instance*>(GetBackRef(object_id));
intptr_t instance_size = 0;
if (result == NULL) {
result = &(Instance::ZoneHandle(isolate(), Instance::null()));
AddBackRef(object_id, result, kIsDeserialized);
cls_ ^= ReadObjectImpl();
ASSERT(!cls_.IsNull());
instance_size = cls_.instance_size();
ASSERT(instance_size > 0);
// Allocate the instance and read in all the fields for the object.
if (kind_ == Snapshot::kFull) {
*result ^= AllocateUninitialized(cls_.id(), instance_size);
} else {
*result ^= Object::Allocate(cls_.id(),
instance_size,
HEAP_SPACE(kind_));
}
} else {
cls_ ^= ReadObjectImpl();
ASSERT(!cls_.IsNull());
instance_size = cls_.instance_size();
}
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 is_canonical = RawObject::IsCanonical(tags);
intptr_t offset = Instance::NextFieldOffset();
intptr_t result_cid = result->GetClassId();
while (offset < next_field_offset) {
pobj_ = is_canonical ? ReadObjectImpl() : ReadObjectRef();
result->SetFieldAtOffset(offset, pobj_);
if ((offset != type_argument_field_offset) &&
(kind_ == Snapshot::kMessage)) {
// 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 ReadObjectRef.
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 (kind_ == Snapshot::kFull) {
// We create an uninitialized object in the case of full snapshots, so
// we need to initialize any remaining padding area with the Null object.
while (offset < instance_size) {
result->SetFieldAtOffset(offset, Object::null_object());
offset += kWordSize;
}
result->SetCreatedFromSnapshot();
} else if (RawObject::IsCanonical(tags)) {
*result = result->CheckAndCanonicalize(NULL);
ASSERT(!result->IsNull());
}
return result->raw();
}
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_); \
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_);
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_);
break;
}
#undef SNAPSHOT_READ
default: UNREACHABLE(); break;
}
if (kind_ == Snapshot::kFull) {
pobj_.SetCreatedFromSnapshot();
}
return pobj_.raw();
}
void SnapshotReader::ArrayReadFrom(const Array& result,
intptr_t len,
intptr_t tags) {
// Set the object tags.
result.set_tags(tags);
// Setup the object fields.
*TypeArgumentsHandle() ^= ReadObjectImpl();
result.SetTypeArguments(*TypeArgumentsHandle());
bool is_canonical = RawObject::IsCanonical(tags);
for (intptr_t i = 0; i < len; i++) {
*PassiveObjectHandle() = is_canonical ? ReadObjectImpl() : ReadObjectRef();
result.SetAt(i, *PassiveObjectHandle());
}
}
SnapshotWriter::SnapshotWriter(Snapshot::Kind kind,
uint8_t** buffer,
ReAlloc alloc,
intptr_t initial_size,
bool can_send_any_object)
: BaseWriter(buffer, alloc, initial_size),
kind_(kind),
isolate_(Isolate::Current()),
object_store_(isolate_->object_store()),
class_table_(isolate_->class_table()),
forward_list_(kMaxPredefinedObjectIds),
exception_type_(Exceptions::kNone),
exception_msg_(NULL),
unmarked_objects_(false),
can_send_any_object_(can_send_any_object) {
}
void SnapshotWriter::WriteObject(RawObject* rawobj) {
WriteObjectImpl(rawobj);
WriteForwardedObjects();
}
void SnapshotWriter::HandleVMIsolateObject(RawObject* rawobj) {
// Check if it is a singleton null object.
if (rawobj == Object::null()) {
WriteVMIsolateObject(kNullObject);
return;
}
// Check if it is a singleton sentinel object.
if (rawobj == Object::sentinel().raw()) {
WriteVMIsolateObject(kSentinelObject);
return;
}
// Check if it is a singleton empty array object.
if (rawobj == Object::empty_array().raw()) {
WriteVMIsolateObject(kEmptyArrayObject);
return;
}
// Check if it is a singleton zero array object.
if (rawobj == Object::zero_array().raw()) {
WriteVMIsolateObject(kZeroArrayObject);
return;
}
// Check if it is a singleton dyanmic Type object.
if (rawobj == Object::dynamic_type()) {
WriteVMIsolateObject(kDynamicType);
return;
}
// Check if it is a singleton void Type object.
if (rawobj == Object::void_type()) {
WriteVMIsolateObject(kVoidType);
return;
}
// Check if it is a singleton boolean true object.
if (rawobj == Bool::True().raw()) {
WriteVMIsolateObject(kTrueValue);
return;
}
// Check if it is a singleton boolean false object.
if (rawobj == Bool::False().raw()) {
WriteVMIsolateObject(kFalseValue);
return;
}
// 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;
}
}
// Check it is a predefined symbol in the VM isolate.
id = Symbols::LookupVMSymbol(rawobj);
if (id != kInvalidIndex) {
WriteVMIsolateObject(id);
return;
}
UNREACHABLE();
}
void SnapshotWriter::WriteObjectRef(RawObject* raw) {
// First check if object can be written as a simple predefined type.
if (CheckAndWritePredefinedObject(raw)) {
return;
}
NoGCScope no_gc;
RawClass* cls = class_table_->At(raw->GetClassId());
intptr_t class_id = cls->ptr()->id_;
ASSERT(class_id == raw->GetClassId());
if (class_id >= kNumPredefinedCids) {
WriteInstanceRef(raw, cls);
return;
}
if (class_id == kArrayCid) {
// Object is being referenced, add it to the forward ref list and mark
// it so that future references to this object in the snapshot will use
// this object id. Mark it as not having been serialized yet so that we
// will serialize the object when we go through the forward list.
forward_list_.MarkAndAddObject(raw, kIsNotSerialized);
RawArray* rawarray = reinterpret_cast<RawArray*>(raw);
// Write out the serialization header value for this object.
WriteInlinedObjectHeader(kOmittedObjectId);
// Write out the class information.
WriteIndexedObject(kArrayCid);
// Write out the length field.
Write<RawObject*>(rawarray->ptr()->length_);
return;
}
if (class_id == kImmutableArrayCid) {
// Object is being referenced, add it to the forward ref list and mark
// it so that future references to this object in the snapshot will use
// this object id. Mark it as not having been serialized yet so that we
// will serialize the object when we go through the forward list.
forward_list_.MarkAndAddObject(raw, kIsNotSerialized);
RawArray* rawarray = reinterpret_cast<RawArray*>(raw);
// Write out the serialization header value for this object.
WriteInlinedObjectHeader(kOmittedObjectId);
// Write out the class information.
WriteIndexedObject(kImmutableArrayCid);
// Write out the length field.
Write<RawObject*>(rawarray->ptr()->length_);
return;
}
if (RawObject::IsImplicitFieldClassId(class_id)) {
WriteInstanceRef(raw, cls);
return;
}
// Object is being referenced, add it to the forward ref list and mark
// it so that future references to this object in the snapshot will use
// this object id. Mark it as not having been serialized yet so that we
// will serialize the object when we go through the forward list.
forward_list_.MarkAndAddObject(raw, kIsSerialized);
switch (class_id) {
#define SNAPSHOT_WRITE(clazz) \
case clazz::kClassId: { \
Raw##clazz* raw_obj = reinterpret_cast<Raw##clazz*>(raw); \
raw_obj->WriteTo(this, kOmittedObjectId, kind_); \
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, kOmittedObjectId, kind_);
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, kOmittedObjectId, kind_);
return;
}
#undef SNAPSHOT_WRITE
default: break;
}
UNREACHABLE();
}
void FullSnapshotWriter::WriteFullSnapshot() {
ASSERT(isolate() != NULL);
ObjectStore* object_store = isolate()->object_store();
ASSERT(object_store != NULL);
ASSERT(ClassFinalizer::AllClassesFinalized());
// Ensure the class table is valid.
#if defined(DEBUG)
isolate()->ValidateClassTable();
#endif
// 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.
WriteVersion();
// Write out the full snapshot.
{
NoGCScope no_gc;
// Write out all the objects in the object store of the isolate which
// is the root set for all dart allocated objects at this point.
SnapshotWriterVisitor visitor(this, false);
object_store->VisitObjectPointers(&visitor);
// Write out all forwarded objects.
WriteForwardedObjects();
FillHeader(kind());
UnmarkAll();
}
} else {
ThrowException(exception_type(), exception_msg());
}
}
uword SnapshotWriter::GetObjectTags(RawObject* raw) {
uword tags = raw->ptr()->tags_;
if (SerializedHeaderTag::decode(tags) == kObjectId) {
intptr_t id = SerializedHeaderData::decode(tags);
return forward_list_.NodeForObjectId(id)->tags();
} else {
return tags;
}
}
ForwardList::ForwardList(intptr_t first_object_id)
: first_object_id_(first_object_id),
nodes_(),
first_unprocessed_object_id_(first_object_id) {
// The ForwardList encodes information in the header tag word. There cannot
// be any concurrent GC tasks while it is in use.
PageSpace* page_space = Isolate::Current()->heap()->old_space();
MonitorLocker ml(page_space->tasks_lock());
while (page_space->tasks() > 0) {
ml.Wait();
}
page_space->set_tasks(1);
}
ForwardList::~ForwardList() {
PageSpace* page_space = Isolate::Current()->heap()->old_space();
MonitorLocker ml(page_space->tasks_lock());
ASSERT(page_space->tasks() == 1);
page_space->set_tasks(0);
ml.Notify();
}
intptr_t ForwardList::MarkAndAddObject(RawObject* raw, SerializeState state) {
NoGCScope no_gc;
intptr_t object_id = next_object_id();
ASSERT(object_id <= kMaxObjectId);
uword value = 0;
value = SerializedHeaderTag::update(kObjectId, value);
value = SerializedHeaderData::update(object_id, value);
uword tags = raw->ptr()->tags_;
ASSERT(SerializedHeaderTag::decode(tags) != kObjectId);
raw->ptr()->tags_ = value;
Node* node = new Node(raw, tags, state);
ASSERT(node != NULL);
nodes_.Add(node);
return object_id;
}
void ForwardList::UnmarkAll() const {
NoGCScope no_gc;
for (intptr_t id = first_object_id(); id < next_object_id(); ++id) {
const Node* node = NodeForObjectId(id);
RawObject* raw = node->raw();
raw->ptr()->tags_ = node->tags(); // Restore original tags.
}
}
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)
NoGCScope no_gc;
// 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.
uword tags = rawobj->ptr()->tags_;
if (SerializedHeaderTag::decode(tags) == kObjectId) {
intptr_t id = SerializedHeaderData::decode(tags);
WriteIndexedObject(id);
return true;
}
// Now check if it is an object from the VM isolate (NOTE: premarked objects
// are considered to be objects in the VM isolate). These objects are shared
// by all isolates.
if (rawobj->IsVMHeapObject()) {
HandleVMIsolateObject(rawobj);
return true;
}
// Check if the object is a Mint and could potentially be a Smi
// on other architectures (64 bit), if so write it out as int64_t value.
if (cid == kMintCid) {
int64_t value = reinterpret_cast<RawMint*>(rawobj)->ptr()->value_;
const intptr_t kSmi64Bits = 62;
const int64_t kSmi64Max = (static_cast<int64_t>(1) << kSmi64Bits) - 1;
const int64_t kSmi64Min = -(static_cast<int64_t>(1) << kSmi64Bits);
if (value <= kSmi64Max && value >= kSmi64Min) {
Write<int64_t>((value << kSmiTagShift) | kSmiTag);
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.
if (kind_ != Snapshot::kFull) {
// 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) {
// First check if object can be written as a simple predefined type.
if (CheckAndWritePredefinedObject(raw)) {
return;
}
// Object is being serialized, add it to the forward ref list and mark
// it so that future references to this object in the snapshot will use
// an object id, instead of trying to serialize it again.
forward_list_.MarkAndAddObject(raw, kIsSerialized);
WriteInlinedObject(raw);
}
void SnapshotWriter::WriteInlinedObject(RawObject* raw) {
// Now write the object out inline in the stream as follows:
// - Object is seen for the first time (inlined as follows):
// (object size in multiples of kObjectAlignment | 0x1)
// serialized fields of the object
// ......
NoGCScope no_gc;
uword tags = raw->ptr()->tags_;
ASSERT(SerializedHeaderTag::decode(tags) == kObjectId);
intptr_t object_id = SerializedHeaderData::decode(tags);
tags = forward_list_.NodeForObjectId(object_id)->tags();
RawClass* cls = class_table_->At(RawObject::ClassIdTag::decode(tags));
intptr_t class_id = cls->ptr()->id_;
if (!IsSplitClassId(class_id)) {
object_id = kOmittedObjectId;
}
if (class_id >= kNumPredefinedCids) {
WriteInstance(object_id, raw, cls, tags);
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_); \
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_);
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_);
return;
}
#undef SNAPSHOT_WRITE
#define SNAPSHOT_WRITE(clazz) \
case kTypedData##clazz##ViewCid: \
CLASS_LIST_TYPED_DATA(SNAPSHOT_WRITE)
case kByteDataViewCid: {
WriteInstance(object_id, raw, cls, tags);
return;
}
#undef SNAPSHOT_WRITE
default: break;
}
UNREACHABLE();
}
class WriteInlinedObjectVisitor : public ObjectVisitor {
public:
explicit WriteInlinedObjectVisitor(SnapshotWriter* writer)
: ObjectVisitor(Isolate::Current()), writer_(writer) {}
virtual void VisitObject(RawObject* obj) {
writer_->WriteInlinedObject(obj);
}
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)->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(kind_ != Snapshot::kFull);
int class_id = cls->ptr()->id_;
ASSERT(!IsSingletonClassId(class_id) && !IsObjectStoreClassId(class_id));
// TODO(5411462): Should restrict this to only core-lib classes in this
// case.
// Write out the class and tags information.
WriteVMIsolateObject(kClassCid);
WriteTags(GetObjectTags(cls));
// Write out the library url and class name.
RawLibrary* library = cls->ptr()->library_;
ASSERT(library != Library::null());
WriteObjectImpl(library->ptr()->url_);
WriteObjectImpl(cls->ptr()->name_);
}
void SnapshotWriter::ArrayWriteTo(intptr_t object_id,
intptr_t array_kind,
intptr_t tags,
RawSmi* length,
RawTypeArguments* type_arguments,
RawObject* data[]) {
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);
// Write out the individual object ids.
bool is_canonical = RawObject::IsCanonical(tags);
for (intptr_t i = 0; i < len; i++) {
if (is_canonical) {
WriteObjectImpl(data[i]);
} else {
WriteObjectRef(data[i]);
}
}
}
void SnapshotWriter::CheckIfSerializable(RawClass* cls) {
if (Class::IsSignatureClass(cls)) {
// We do not allow closure objects in an isolate message.
Isolate* isolate = Isolate::Current();
HANDLESCOPE(isolate);
const char* format = "Illegal argument in isolate message"
" : (object is a closure - %s %s)";
UnmarkAll(); // Unmark objects now as we are about to print stuff.
const Class& clazz = Class::Handle(isolate, cls);
const Function& func = Function::Handle(isolate,
clazz.signature_function());
ASSERT(!func.IsNull());
intptr_t len = OS::SNPrint(NULL, 0, format,
clazz.ToCString(), func.ToCString()) + 1;
char* chars = isolate->current_zone()->Alloc<char>(len);
OS::SNPrint(chars, len, format, clazz.ToCString(), func.ToCString());
SetWriteException(Exceptions::kArgument, chars);
}
if (cls->ptr()->num_native_fields_ != 0) {
// We do not allow objects with native fields in an isolate message.
Isolate* isolate = Isolate::Current();
HANDLESCOPE(Isolate::Current());
const char* format = "Illegal argument in isolate message"
" : (object extends NativeWrapper - %s)";
UnmarkAll(); // Unmark objects now as we are about to print stuff.
const Class& clazz = Class::Handle(isolate, cls);
intptr_t len = OS::SNPrint(NULL, 0, format, clazz.ToCString()) + 1;
char* chars = isolate->current_zone()->Alloc<char>(len);
OS::SNPrint(chars, len, format, 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().
isolate()->long_jump_base()->
Jump(1, Object::snapshot_writer_error());
}
void SnapshotWriter::WriteInstance(intptr_t object_id,
RawObject* raw,
RawClass* cls,
intptr_t tags) {
// First check if object is a closure or has native fields.
CheckIfSerializable(cls);
// Object is regular dart instance.
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);
// Write out all the fields for the object.
// Instance::NextFieldOffset() returns the offset of the first field in
// a Dart object.
bool is_canonical = RawObject::IsCanonical(tags);
intptr_t offset = Instance::NextFieldOffset();
while (offset < next_field_offset) {
RawObject* raw_obj = *reinterpret_cast<RawObject**>(
reinterpret_cast<uword>(raw->ptr()) + offset);
if (is_canonical) {
WriteObjectImpl(raw_obj);
} else {
WriteObjectRef(raw_obj);
}
offset += kWordSize;
}
return;
}
void SnapshotWriter::WriteInstanceRef(RawObject* raw, RawClass* cls) {
// First check if object is a closure or has native fields.
CheckIfSerializable(cls);
// Object is being referenced, add it to the forward ref list and mark
// it so that future references to this object in the snapshot will use
// this object id. Mark it as not having been serialized yet so that we
// will serialize the object when we go through the forward list.
forward_list_.MarkAndAddObject(raw, kIsNotSerialized);
// Write out the serialization header value for this object.
WriteInlinedObjectHeader(kOmittedObjectId);
// Indicate this is an instance object.
Write<int32_t>(SerializedHeaderData::encode(kInstanceObjectId));
// Write out the class information for this object.
WriteObjectImpl(cls);
}
bool SnapshotWriter::AllowObjectsInDartLibrary(RawLibrary* library) {
return (library == object_store()->collection_library() ||
library == object_store()->typed_data_library());
}
void SnapshotWriter::ThrowException(Exceptions::ExceptionType type,
const char* msg) {
object_store()->clear_sticky_error();
UnmarkAll();
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::WriteVersion() {
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);
}
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.
WriteVersion();
// Write out the library object.
{
NoGCScope no_gc;
// Write out the library object.
WriteObject(lib.raw());
FillHeader(kind());
UnmarkAll();
}
} else {
ThrowException(exception_type(), exception_msg());
}
}
void SnapshotWriterVisitor::VisitPointers(RawObject** first, RawObject** last) {
for (RawObject** current = first; current <= last; current++) {
RawObject* raw_obj = *current;
if (as_references_) {
writer_->WriteObjectRef(raw_obj);
} else {
writer_->WriteObjectImpl(raw_obj);
}
}
}
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) {
NoGCScope no_gc;
WriteObject(obj.raw());
UnmarkAll();
} else {
ThrowException(exception_type(), exception_msg());
}
}
} // namespace dart
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