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#include "snapshot_builder.h"
#include <iostream>
#include <sstream>
#include "debug_utils-inl.h"
#include "env-inl.h"
#include "node_external_reference.h"
#include "node_internals.h"
#include "node_main_instance.h"
#include "node_v8_platform-inl.h"
namespace node {
using v8::Context;
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::Object;
using v8::SnapshotCreator;
using v8::StartupData;
template <typename T>
void WriteVector(std::stringstream* ss, const T* vec, size_t size) {
for (size_t i = 0; i < size; i++) {
*ss << std::to_string(vec[i]) << (i == size - 1 ? '\n' : ',');
}
}
std::string FormatBlob(v8::StartupData* blob,
const std::vector<size_t>& isolate_data_indexes,
const EnvSerializeInfo& env_info) {
std::stringstream ss;
ss << R"(#include <cstddef>
#include "env.h"
#include "node_main_instance.h"
#include "v8.h"
// This file is generated by tools/snapshot. Do not edit.
namespace node {
static const char blob_data[] = {
)";
WriteVector(&ss, blob->data, blob->raw_size);
ss << R"(};
static const int blob_size = )"
<< blob->raw_size << R"(;
static v8::StartupData blob = { blob_data, blob_size };
)";
ss << R"(v8::StartupData* NodeMainInstance::GetEmbeddedSnapshotBlob() {
return &blob;
}
static const std::vector<size_t> isolate_data_indexes {
)";
WriteVector(&ss, isolate_data_indexes.data(), isolate_data_indexes.size());
ss << R"(};
const std::vector<size_t>* NodeMainInstance::GetIsolateDataIndexes() {
return &isolate_data_indexes;
}
static const EnvSerializeInfo env_info )"
<< env_info << R"(;
const EnvSerializeInfo* NodeMainInstance::GetEnvSerializeInfo() {
return &env_info;
}
} // namespace node
)";
return ss.str();
}
static v8::StartupData SerializeNodeContextInternalFields(Local<Object> holder,
int index,
void* env) {
void* ptr = holder->GetAlignedPointerFromInternalField(index);
if (ptr == nullptr || ptr == env) {
return StartupData{nullptr, 0};
}
if (ptr == env && index == ContextEmbedderIndex::kEnvironment) {
return StartupData{nullptr, 0};
}
// No embedder objects in the builtin snapshot yet.
UNREACHABLE();
return StartupData{nullptr, 0};
}
std::string SnapshotBuilder::Generate(
const std::vector<std::string> args,
const std::vector<std::string> exec_args) {
Isolate* isolate = Isolate::Allocate();
per_process::v8_platform.Platform()->RegisterIsolate(isolate,
uv_default_loop());
std::unique_ptr<NodeMainInstance> main_instance;
std::string result;
{
std::vector<size_t> isolate_data_indexes;
EnvSerializeInfo env_info;
const std::vector<intptr_t>& external_references =
NodeMainInstance::CollectExternalReferences();
SnapshotCreator creator(isolate, external_references.data());
Environment* env;
{
main_instance =
NodeMainInstance::Create(isolate,
uv_default_loop(),
per_process::v8_platform.Platform(),
args,
exec_args);
HandleScope scope(isolate);
creator.SetDefaultContext(Context::New(isolate));
isolate_data_indexes = main_instance->isolate_data()->Serialize(&creator);
Local<Context> context = NewContext(isolate);
Context::Scope context_scope(context);
env = new Environment(main_instance->isolate_data(),
context,
args,
exec_args,
nullptr,
node::EnvironmentFlags::kDefaultFlags,
{});
if (per_process::enabled_debug_list.enabled(DebugCategory::MKSNAPSHOT)) {
env->PrintAllBaseObjects();
printf("Environment = %p\n", env);
}
env_info = env->Serialize(&creator);
size_t index = creator.AddContext(
context, {SerializeNodeContextInternalFields, env});
CHECK_EQ(index, NodeMainInstance::kNodeContextIndex);
}
// Must be out of HandleScope
StartupData blob =
creator.CreateBlob(SnapshotCreator::FunctionCodeHandling::kClear);
CHECK(blob.CanBeRehashed());
// Must be done while the snapshot creator isolate is entered i.e. the
// creator is still alive.
FreeEnvironment(env);
main_instance->Dispose();
result = FormatBlob(&blob, isolate_data_indexes, env_info);
delete[] blob.data;
}
per_process::v8_platform.Platform()->UnregisterIsolate(isolate);
return result;
}
} // namespace node
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