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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.h"
#include "src/assembler-inl.h"
#include "src/heap/heap-inl.h"
#include "src/snapshot/builtin-deserializer.h"
#include "src/snapshot/snapshot.h"
namespace v8 {
namespace internal {
void StartupDeserializer::DeserializeInto(Isolate* isolate) {
Initialize(isolate);
BuiltinDeserializer builtin_deserializer(isolate, builtin_data_);
if (!DefaultDeserializerAllocator::ReserveSpace(this,
&builtin_deserializer)) {
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_ONLY_STRONG);
isolate->heap()->RepairFreeListsAfterDeserialization();
isolate->heap()->IterateWeakRoots(this, VISIT_FOR_SERIALIZATION);
DeserializeDeferredObjects();
RestoreExternalReferenceRedirectors(accessor_infos());
RestoreExternalReferenceRedirectors(call_handler_infos());
// Deserialize eager builtins from the builtin snapshot. Note that deferred
// objects must have been deserialized prior to this.
builtin_deserializer.DeserializeEagerBuiltinsAndHandlers();
// Flush the instruction cache for the entire code-space. Must happen after
// builtins deserialization.
FlushICacheForNewIsolate();
}
isolate->heap()->set_native_contexts_list(isolate->heap()->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(
isolate->heap()->undefined_value());
}
// Issue code events for newly deserialized code objects.
LOG_CODE_EVENT(isolate, LogCodeObjects());
LOG_CODE_EVENT(isolate, LogBytecodeHandlers());
LOG_CODE_EVENT(isolate, LogCompiledFunctions());
isolate->builtins()->MarkInitialized();
// If needed, print the dissassembly of deserialized code objects.
// Needs to be called after the builtins are marked as initialized, in order
// to display the builtin names.
PrintDisassembledCodeObjects();
if (FLAG_rehash_snapshot && can_rehash()) RehashHeap();
}
void StartupDeserializer::FlushICacheForNewIsolate() {
DCHECK(!deserializing_user_code());
// The entire isolate is newly deserialized. Simply flush all code pages.
for (Page* p : *isolate()->heap()->code_space()) {
Assembler::FlushICache(p->area_start(), p->area_end() - p->area_start());
}
}
void StartupDeserializer::PrintDisassembledCodeObjects() {
#ifdef ENABLE_DISASSEMBLER
if (FLAG_print_builtin_code) {
Heap* heap = isolate()->heap();
HeapIterator iterator(heap);
DisallowHeapAllocation no_gc;
CodeTracer::Scope tracing_scope(isolate()->GetCodeTracer());
OFStream os(tracing_scope.file());
for (HeapObject* obj = iterator.next(); obj != nullptr;
obj = iterator.next()) {
if (obj->IsCode()) {
Code::cast(obj)->Disassemble(nullptr, os);
}
}
}
#endif
}
void StartupDeserializer::RehashHeap() {
DCHECK(FLAG_rehash_snapshot && can_rehash());
isolate()->heap()->InitializeHashSeed();
Rehash();
}
} // namespace internal
} // namespace v8
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