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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/objects-inl.h"
namespace v8 {
namespace internal {
ExternalReferenceEncoder::ExternalReferenceEncoder(Isolate* isolate) {
#ifdef DEBUG
api_references_ = isolate->api_external_references();
if (api_references_ != nullptr) {
for (uint32_t i = 0; api_references_[i] != 0; ++i) count_.push_back(0);
}
#endif // DEBUG
map_ = isolate->external_reference_map();
if (map_ != nullptr) return;
map_ = new AddressToIndexHashMap();
isolate->set_external_reference_map(map_);
// Add V8's external references.
ExternalReferenceTable* table = isolate->heap()->external_reference_table();
for (uint32_t i = 0; i < table->size(); ++i) {
Address addr = table->address(i);
// Ignore duplicate references.
// This can happen due to ICF. See http://crbug.com/726896.
if (map_->Get(addr).IsNothing()) map_->Set(addr, Value::Encode(i, false));
DCHECK(map_->Get(addr).IsJust());
}
// Add external references provided by the embedder.
const intptr_t* api_references = isolate->api_external_references();
if (api_references == nullptr) return;
for (uint32_t i = 0; api_references[i] != 0; ++i) {
Address addr = reinterpret_cast<Address>(api_references[i]);
// Ignore duplicate references.
// This can happen due to ICF. See http://crbug.com/726896.
if (map_->Get(addr).IsNothing()) map_->Set(addr, Value::Encode(i, true));
DCHECK(map_->Get(addr).IsJust());
}
}
ExternalReferenceEncoder::~ExternalReferenceEncoder() {
#ifdef DEBUG
if (!i::FLAG_external_reference_stats) return;
if (api_references_ == nullptr) return;
for (uint32_t i = 0; api_references_[i] != 0; ++i) {
Address addr = reinterpret_cast<Address>(api_references_[i]);
DCHECK(map_->Get(addr).IsJust());
v8::base::OS::Print("index=%5d count=%5d %-60s\n", i, count_[i],
ExternalReferenceTable::ResolveSymbol(addr));
}
#endif // DEBUG
}
Maybe<ExternalReferenceEncoder::Value> ExternalReferenceEncoder::TryEncode(
Address address) {
Maybe<uint32_t> maybe_index = map_->Get(address);
if (maybe_index.IsNothing()) return Nothing<Value>();
Value result(maybe_index.FromJust());
#ifdef DEBUG
if (result.is_from_api()) count_[result.index()]++;
#endif // DEBUG
return Just<Value>(result);
}
ExternalReferenceEncoder::Value ExternalReferenceEncoder::Encode(
Address address) {
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();
}
Value result(maybe_index.FromJust());
#ifdef DEBUG
if (result.is_from_api()) count_[result.index()]++;
#endif // DEBUG
return result;
}
const char* ExternalReferenceEncoder::NameOfAddress(Isolate* isolate,
Address address) const {
Maybe<uint32_t> maybe_index = map_->Get(address);
if (maybe_index.IsNothing()) return "<unknown>";
return isolate->heap()->external_reference_table()->name(
maybe_index.FromJust());
}
void SerializedData::AllocateData(uint32_t size) {
DCHECK(!owns_data_);
data_ = NewArray<byte>(size);
size_ = size;
owns_data_ = true;
DCHECK(IsAligned(reinterpret_cast<intptr_t>(data_), kPointerAlignment));
}
// static
uint32_t SerializedData::ComputeMagicNumber(Isolate* isolate) {
return ComputeMagicNumber(isolate->heap()->external_reference_table());
}
// 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, RootVisitor* visitor) {
std::vector<Object*>* cache = isolate->partial_snapshot_cache();
for (size_t i = 0;; ++i) {
// Extend the array ready to get a value when deserializing.
if (cache->size() <= i) cache->push_back(Smi::kZero);
// During deserialization, the visitor populates the partial snapshot cache
// and eventually terminates the cache with undefined.
visitor->VisitRootPointer(Root::kPartialSnapshotCache, nullptr,
&cache->at(i));
if (cache->at(i)->IsUndefined(isolate)) break;
}
}
bool SerializerDeserializer::CanBeDeferred(HeapObject* o) {
return !o->IsString() && !o->IsScript() && !o->IsJSTypedArray();
}
void SerializerDeserializer::RestoreExternalReferenceRedirectors(
const std::vector<AccessorInfo*>& accessor_infos) {
// Restore wiped accessor infos.
for (AccessorInfo* info : accessor_infos) {
Foreign::cast(info->js_getter())
->set_foreign_address(info->redirected_getter());
}
}
void SerializerDeserializer::RestoreExternalReferenceRedirectors(
const std::vector<CallHandlerInfo*>& call_handler_infos) {
for (CallHandlerInfo* info : call_handler_infos) {
Foreign::cast(info->js_callback())
->set_foreign_address(info->redirected_callback());
}
}
} // namespace internal
} // namespace v8
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