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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/snapshot/context-deserializer.h"
#include "src/api/api-inl.h"
#include "src/common/assert-scope.h"
#include "src/logging/counters-scopes.h"
namespace v8 {
namespace internal {
// static
MaybeHandle<Context> ContextDeserializer::DeserializeContext(
Isolate* isolate, const SnapshotData* data, bool can_rehash,
Handle<JSGlobalProxy> global_proxy,
v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer) {
NestedTimedHistogramScope histogram_timer(
isolate->counters()->snapshot_deserialize_context());
ContextDeserializer d(isolate, data, can_rehash);
MaybeHandle<Object> maybe_result =
d.Deserialize(isolate, global_proxy, embedder_fields_deserializer);
Handle<Object> result;
return maybe_result.ToHandle(&result) ? Handle<Context>::cast(result)
: MaybeHandle<Context>();
}
MaybeHandle<Object> ContextDeserializer::Deserialize(
Isolate* isolate, Handle<JSGlobalProxy> global_proxy,
v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer) {
// Replace serialized references to the global proxy and its map with the
// given global proxy and its map.
AddAttachedObject(global_proxy);
AddAttachedObject(handle(global_proxy->map(), isolate));
Handle<Object> result;
{
// There's no code deserialized here. If this assert fires then that's
// changed and logging should be added to notify the profiler et al. of
// the new code, which also has to be flushed from instruction cache.
DisallowCodeAllocation no_code_allocation;
result = ReadObject();
DeserializeDeferredObjects();
DeserializeEmbedderFields(embedder_fields_deserializer);
LogNewMapEvents();
WeakenDescriptorArrays();
}
if (should_rehash()) Rehash();
return result;
}
void ContextDeserializer::DeserializeEmbedderFields(
v8::DeserializeEmbedderFieldsCallback embedder_fields_deserializer) {
if (!source()->HasMore() || source()->Get() != kEmbedderFieldsData) return;
DisallowGarbageCollection no_gc;
DisallowJavascriptExecution no_js(isolate());
DisallowCompilation no_compile(isolate());
DCHECK_NOT_NULL(embedder_fields_deserializer.callback);
for (int code = source()->Get(); code != kSynchronize;
code = source()->Get()) {
HandleScope scope(isolate());
Handle<JSObject> obj = Handle<JSObject>::cast(GetBackReferencedObject());
int index = source()->GetInt();
int size = source()->GetInt();
// TODO(yangguo,jgruber): Turn this into a reusable shared buffer.
byte* data = new byte[size];
source()->CopyRaw(data, size);
embedder_fields_deserializer.callback(v8::Utils::ToLocal(obj), index,
{reinterpret_cast<char*>(data), size},
embedder_fields_deserializer.data);
delete[] data;
}
}
} // namespace internal
} // namespace v8
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