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// Copyright 2016 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/serializer-common.h"
#include "src/external-reference-table.h"
#include "src/ic/stub-cache.h"
#include "src/list-inl.h"
namespace v8 {
namespace internal {
ExternalReferenceEncoder::ExternalReferenceEncoder(Isolate* isolate) {
map_ = isolate->external_reference_map();
#ifdef DEBUG
table_ = ExternalReferenceTable::instance(isolate);
#endif // DEBUG
if (map_ != nullptr) return;
map_ = new AddressToIndexHashMap();
ExternalReferenceTable* table = ExternalReferenceTable::instance(isolate);
for (uint32_t i = 0; i < table->size(); ++i) {
Address addr = table->address(i);
DCHECK(map_->Get(addr).IsNothing() ||
strncmp(table->name(i), "Redirect to ", 12) == 0);
map_->Set(addr, i);
DCHECK(map_->Get(addr).IsJust());
}
isolate->set_external_reference_map(map_);
}
uint32_t ExternalReferenceEncoder::Encode(Address address) const {
Maybe<uint32_t> maybe_index = map_->Get(address);
if (maybe_index.IsNothing()) {
void* addr = address;
v8::base::OS::PrintError("Unknown external reference %p.\n", addr);
v8::base::OS::PrintError("%s", ExternalReferenceTable::ResolveSymbol(addr));
v8::base::OS::Abort();
}
#ifdef DEBUG
table_->increment_count(maybe_index.FromJust());
#endif // DEBUG
return maybe_index.FromJust();
}
const char* ExternalReferenceEncoder::NameOfAddress(Isolate* isolate,
Address address) const {
Maybe<uint32_t> maybe_index = map_->Get(address);
if (maybe_index.IsNothing()) return "<unknown>";
return ExternalReferenceTable::instance(isolate)->name(
maybe_index.FromJust());
}
void SerializedData::AllocateData(int size) {
DCHECK(!owns_data_);
data_ = NewArray<byte>(size);
size_ = size;
owns_data_ = true;
DCHECK(IsAligned(reinterpret_cast<intptr_t>(data_), kPointerAlignment));
}
// The partial snapshot cache is terminated by undefined. We visit the
// partial snapshot...
// - during deserialization to populate it.
// - during normal GC to keep its content alive.
// - not during serialization. The partial serializer adds to it explicitly.
DISABLE_CFI_PERF
void SerializerDeserializer::Iterate(Isolate* isolate, ObjectVisitor* visitor) {
List<Object*>* cache = isolate->partial_snapshot_cache();
for (int i = 0;; ++i) {
// Extend the array ready to get a value when deserializing.
if (cache->length() <= i) cache->Add(Smi::kZero);
// During deserialization, the visitor populates the partial snapshot cache
// and eventually terminates the cache with undefined.
visitor->VisitPointer(&cache->at(i));
if (cache->at(i)->IsUndefined(isolate)) break;
}
}
bool SerializerDeserializer::CanBeDeferred(HeapObject* o) {
return !o->IsString() && !o->IsScript();
}
} // namespace internal
} // namespace v8
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