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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/startup-deserializer.h" #include "src/api/api.h" #include "src/codegen/assembler-inl.h" #include "src/execution/v8threads.h" #include "src/heap/heap-inl.h" #include "src/snapshot/snapshot.h" namespace v8 { namespace internal { void StartupDeserializer::DeserializeInto(Isolate* isolate) { Initialize(isolate); if (!allocator()->ReserveSpace()) { V8::FatalProcessOutOfMemory(isolate, "StartupDeserializer"); } // No active threads. DCHECK_NULL(isolate->thread_manager()->FirstThreadStateInUse()); // No active handles. DCHECK(isolate->handle_scope_implementer()->blocks()->empty()); // Partial snapshot cache is not yet populated. DCHECK(isolate->partial_snapshot_cache()->empty()); // Builtins are not yet created. DCHECK(!isolate->builtins()->is_initialized()); { DisallowHeapAllocation no_gc; isolate->heap()->IterateSmiRoots(this); isolate->heap()->IterateStrongRoots(this, VISIT_FOR_SERIALIZATION); Iterate(isolate, this); isolate->heap()->IterateWeakRoots(this, VISIT_FOR_SERIALIZATION); DeserializeDeferredObjects(); RestoreExternalReferenceRedirectors(accessor_infos()); RestoreExternalReferenceRedirectors(call_handler_infos()); // Flush the instruction cache for the entire code-space. Must happen after // builtins deserialization. FlushICache(); } isolate->heap()->set_native_contexts_list( ReadOnlyRoots(isolate).undefined_value()); // The allocation site list is build during root iteration, but if no sites // were encountered then it needs to be initialized to undefined. if (isolate->heap()->allocation_sites_list() == Smi::kZero) { isolate->heap()->set_allocation_sites_list( ReadOnlyRoots(isolate).undefined_value()); } isolate->builtins()->MarkInitialized(); LogNewMapEvents(); if (FLAG_rehash_snapshot && can_rehash()) { // Hash seed was initalized in ReadOnlyDeserializer. Rehash(); } } void StartupDeserializer::LogNewMapEvents() { if (FLAG_trace_maps) LOG(isolate_, LogAllMaps()); } void StartupDeserializer::FlushICache() { DCHECK(!deserializing_user_code()); // The entire isolate is newly deserialized. Simply flush all code pages. for (Page* p : *isolate()->heap()->code_space()) { FlushInstructionCache(p->area_start(), p->area_end() - p->area_start()); } } } // namespace internal } // namespace v8