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node_snapshotable.cc
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node_snapshotable.cc
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#include "node_snapshotable.h"
#include <fstream>
#include <iostream>
#include <sstream>
#include <vector>
#include "aliased_buffer-inl.h"
#include "base_object-inl.h"
#include "blob_serializer_deserializer-inl.h"
#include "debug_utils-inl.h"
#include "encoding_binding.h"
#include "env-inl.h"
#include "node_blob.h"
#include "node_builtins.h"
#include "node_contextify.h"
#include "node_errors.h"
#include "node_external_reference.h"
#include "node_file.h"
#include "node_internals.h"
#include "node_main_instance.h"
#include "node_metadata.h"
#include "node_process.h"
#include "node_snapshot_builder.h"
#include "node_url.h"
#include "node_util.h"
#include "node_v8.h"
#include "node_v8_platform-inl.h"
#include "timers.h"
#if HAVE_INSPECTOR
#include "inspector/worker_inspector.h" // ParentInspectorHandle
#endif
namespace node {
using v8::Context;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::MaybeLocal;
using v8::Object;
using v8::ObjectTemplate;
using v8::ScriptCompiler;
using v8::ScriptOrigin;
using v8::SnapshotCreator;
using v8::StartupData;
using v8::String;
using v8::TryCatch;
using v8::Value;
const uint32_t SnapshotData::kMagic;
std::ostream& operator<<(std::ostream& output,
const builtins::CodeCacheInfo& info) {
output << "<builtins::CodeCacheInfo id=" << info.id
<< ", length=" << info.data.length << ">\n";
return output;
}
std::ostream& operator<<(std::ostream& output,
const std::vector<builtins::CodeCacheInfo>& vec) {
output << "{\n";
for (const auto& info : vec) {
output << info;
}
output << "}\n";
return output;
}
std::ostream& operator<<(std::ostream& output,
const std::vector<uint8_t>& vec) {
output << "{\n";
for (const auto& i : vec) {
output << i << ",";
}
output << "}";
return output;
}
std::ostream& operator<<(std::ostream& output,
const std::vector<PropInfo>& vec) {
output << "{\n";
for (const auto& info : vec) {
output << " " << info << ",\n";
}
output << "}";
return output;
}
std::ostream& operator<<(std::ostream& output, const PropInfo& info) {
output << "{ \"" << info.name << "\", " << std::to_string(info.id) << ", "
<< std::to_string(info.index) << " }";
return output;
}
std::ostream& operator<<(std::ostream& output,
const std::vector<std::string>& vec) {
output << "{\n";
for (const auto& info : vec) {
output << " \"" << info << "\",\n";
}
output << "}";
return output;
}
std::ostream& operator<<(std::ostream& output, const RealmSerializeInfo& i) {
output << "{\n"
<< "// -- builtins begins --\n"
<< i.builtins << ",\n"
<< "// -- builtins ends --\n"
<< "// -- persistent_values begins --\n"
<< i.persistent_values << ",\n"
<< "// -- persistent_values ends --\n"
<< "// -- native_objects begins --\n"
<< i.native_objects << ",\n"
<< "// -- native_objects ends --\n"
<< i.context << ", // context\n"
<< "}";
return output;
}
std::ostream& operator<<(std::ostream& output, const EnvSerializeInfo& i) {
output << "{\n"
<< "// -- async_hooks begins --\n"
<< i.async_hooks << ",\n"
<< "// -- async_hooks ends --\n"
<< i.tick_info << ", // tick_info\n"
<< i.immediate_info << ", // immediate_info\n"
<< i.timeout_info << ", // timeout_info\n"
<< "// -- performance_state begins --\n"
<< i.performance_state << ",\n"
<< "// -- performance_state ends --\n"
<< i.exit_info << ", // exit_info\n"
<< i.stream_base_state << ", // stream_base_state\n"
<< i.should_abort_on_uncaught_toggle
<< ", // should_abort_on_uncaught_toggle\n"
<< "// -- principal_realm begins --\n"
<< i.principal_realm << ",\n"
<< "// -- principal_realm ends --\n"
<< "}";
return output;
}
class SnapshotDeserializer : public BlobDeserializer<SnapshotDeserializer> {
public:
explicit SnapshotDeserializer(std::string_view v)
: BlobDeserializer<SnapshotDeserializer>(
per_process::enabled_debug_list.enabled(DebugCategory::MKSNAPSHOT),
v) {}
template <typename T,
std::enable_if_t<!std::is_same<T, std::string>::value>* = nullptr,
std::enable_if_t<!std::is_arithmetic<T>::value>* = nullptr>
T Read();
};
class SnapshotSerializer : public BlobSerializer<SnapshotSerializer> {
public:
SnapshotSerializer()
: BlobSerializer<SnapshotSerializer>(
per_process::enabled_debug_list.enabled(
DebugCategory::MKSNAPSHOT)) {
// Currently the snapshot blob built with an empty script is around 4MB.
// So use that as the default sink size.
sink.reserve(4 * 1024 * 1024);
}
template <typename T,
std::enable_if_t<!std::is_same<T, std::string>::value>* = nullptr,
std::enable_if_t<!std::is_arithmetic<T>::value>* = nullptr>
size_t Write(const T& data);
};
// Layout of v8::StartupData
// [ 4/8 bytes ] raw_size
// [ |raw_size| bytes ] contents
template <>
v8::StartupData SnapshotDeserializer::Read() {
Debug("Read<v8::StartupData>()\n");
int raw_size = ReadArithmetic<int>();
Debug("size=%d\n", raw_size);
CHECK_GT(raw_size, 0); // There should be no startup data of size 0.
// The data pointer of v8::StartupData would be deleted so it must be new'ed.
std::unique_ptr<char> buf = std::unique_ptr<char>(new char[raw_size]);
ReadArithmetic<char>(buf.get(), raw_size);
return v8::StartupData{buf.release(), raw_size};
}
template <>
size_t SnapshotSerializer::Write(const v8::StartupData& data) {
Debug("\nWrite<v8::StartupData>() size=%d\n", data.raw_size);
CHECK_GT(data.raw_size, 0); // There should be no startup data of size 0.
size_t written_total = WriteArithmetic<int>(data.raw_size);
written_total +=
WriteArithmetic<char>(data.data, static_cast<size_t>(data.raw_size));
Debug("Write<v8::StartupData>() wrote %d bytes\n\n", written_total);
return written_total;
}
// Layout of builtins::CodeCacheInfo
// [ 4/8 bytes ] length of the module id string
// [ ... ] |length| bytes of module id
// [ 4/8 bytes ] length of module code cache
// [ ... ] |length| bytes of module code cache
template <>
builtins::CodeCacheInfo SnapshotDeserializer::Read() {
Debug("Read<builtins::CodeCacheInfo>()\n");
std::string id = ReadString();
auto owning_ptr =
std::make_shared<std::vector<uint8_t>>(ReadVector<uint8_t>());
builtins::BuiltinCodeCacheData code_cache_data{std::move(owning_ptr)};
builtins::CodeCacheInfo result{id, code_cache_data};
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<builtins::CodeCacheInfo>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(const builtins::CodeCacheInfo& info) {
Debug("\nWrite<builtins::CodeCacheInfo>() id = %s"
", length=%d\n",
info.id.c_str(),
info.data.length);
size_t written_total = WriteString(info.id);
written_total += WriteArithmetic<size_t>(info.data.length);
written_total += WriteArithmetic(info.data.data, info.data.length);
Debug("Write<builtins::CodeCacheInfo>() wrote %d bytes\n", written_total);
return written_total;
}
// Layout of PropInfo
// [ 4/8 bytes ] length of the data name string
// [ ... ] |length| bytes of data name
// [ 4 bytes ] index in the PropInfo vector
// [ 4/8 bytes ] index in the snapshot blob, can be used with
// GetDataFromSnapshotOnce().
template <>
PropInfo SnapshotDeserializer::Read() {
Debug("Read<PropInfo>()\n");
PropInfo result;
result.name = ReadString();
result.id = ReadArithmetic<uint32_t>();
result.index = ReadArithmetic<SnapshotIndex>();
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<PropInfo>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(const PropInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("Write<PropInfo>() %s\n", str.c_str());
}
size_t written_total = WriteString(data.name);
written_total += WriteArithmetic<uint32_t>(data.id);
written_total += WriteArithmetic<SnapshotIndex>(data.index);
Debug("Write<PropInfo>() wrote %d bytes\n", written_total);
return written_total;
}
// Layout of AsyncHooks::SerializeInfo
// [ 4/8 bytes ] snapshot index of async_ids_stack
// [ 4/8 bytes ] snapshot index of fields
// [ 4/8 bytes ] snapshot index of async_id_fields
// [ 4/8 bytes ] snapshot index of js_execution_async_resources
// [ 4/8 bytes ] length of native_execution_async_resources
// [ ... ] snapshot indices of each element in
// native_execution_async_resources
template <>
AsyncHooks::SerializeInfo SnapshotDeserializer::Read() {
Debug("Read<AsyncHooks::SerializeInfo>()\n");
AsyncHooks::SerializeInfo result;
result.async_ids_stack = ReadArithmetic<AliasedBufferIndex>();
result.fields = ReadArithmetic<AliasedBufferIndex>();
result.async_id_fields = ReadArithmetic<AliasedBufferIndex>();
result.js_execution_async_resources = ReadArithmetic<SnapshotIndex>();
result.native_execution_async_resources = ReadVector<SnapshotIndex>();
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<AsyncHooks::SerializeInfo>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(const AsyncHooks::SerializeInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("Write<AsyncHooks::SerializeInfo>() %s\n", str.c_str());
}
size_t written_total =
WriteArithmetic<AliasedBufferIndex>(data.async_ids_stack);
written_total += WriteArithmetic<AliasedBufferIndex>(data.fields);
written_total += WriteArithmetic<AliasedBufferIndex>(data.async_id_fields);
written_total +=
WriteArithmetic<SnapshotIndex>(data.js_execution_async_resources);
written_total +=
WriteVector<SnapshotIndex>(data.native_execution_async_resources);
Debug("Write<AsyncHooks::SerializeInfo>() wrote %d bytes\n", written_total);
return written_total;
}
// Layout of TickInfo::SerializeInfo
// [ 4/8 bytes ] snapshot index of fields
template <>
TickInfo::SerializeInfo SnapshotDeserializer::Read() {
Debug("Read<TickInfo::SerializeInfo>()\n");
TickInfo::SerializeInfo result;
result.fields = ReadArithmetic<AliasedBufferIndex>();
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<TickInfo::SerializeInfo>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(const TickInfo::SerializeInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("Write<TickInfo::SerializeInfo>() %s\n", str.c_str());
}
size_t written_total = WriteArithmetic<AliasedBufferIndex>(data.fields);
Debug("Write<TickInfo::SerializeInfo>() wrote %d bytes\n", written_total);
return written_total;
}
// Layout of TickInfo::SerializeInfo
// [ 4/8 bytes ] snapshot index of fields
template <>
ImmediateInfo::SerializeInfo SnapshotDeserializer::Read() {
Debug("Read<ImmediateInfo::SerializeInfo>()\n");
ImmediateInfo::SerializeInfo result;
result.fields = ReadArithmetic<AliasedBufferIndex>();
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<ImmediateInfo::SerializeInfo>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(const ImmediateInfo::SerializeInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("Write<ImmediateInfo::SerializeInfo>() %s\n", str.c_str());
}
size_t written_total = WriteArithmetic<AliasedBufferIndex>(data.fields);
Debug("Write<ImmediateInfo::SerializeInfo>() wrote %d bytes\n",
written_total);
return written_total;
}
// Layout of PerformanceState::SerializeInfo
// [ 4/8 bytes ] snapshot index of root
// [ 4/8 bytes ] snapshot index of milestones
// [ 4/8 bytes ] snapshot index of observers
template <>
performance::PerformanceState::SerializeInfo SnapshotDeserializer::Read() {
Debug("Read<PerformanceState::SerializeInfo>()\n");
performance::PerformanceState::SerializeInfo result;
result.root = ReadArithmetic<AliasedBufferIndex>();
result.milestones = ReadArithmetic<AliasedBufferIndex>();
result.observers = ReadArithmetic<AliasedBufferIndex>();
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<PerformanceState::SerializeInfo>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(
const performance::PerformanceState::SerializeInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("Write<PerformanceState::SerializeInfo>() %s\n", str.c_str());
}
size_t written_total = WriteArithmetic<AliasedBufferIndex>(data.root);
written_total += WriteArithmetic<AliasedBufferIndex>(data.milestones);
written_total += WriteArithmetic<AliasedBufferIndex>(data.observers);
Debug("Write<PerformanceState::SerializeInfo>() wrote %d bytes\n",
written_total);
return written_total;
}
// Layout of IsolateDataSerializeInfo
// [ 4/8 bytes ] length of primitive_values vector
// [ ... ] |length| of primitive_values indices
// [ 4/8 bytes ] length of template_values vector
// [ ... ] |length| of PropInfo data
template <>
IsolateDataSerializeInfo SnapshotDeserializer::Read() {
Debug("Read<IsolateDataSerializeInfo>()\n");
IsolateDataSerializeInfo result;
result.primitive_values = ReadVector<SnapshotIndex>();
result.template_values = ReadVector<PropInfo>();
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<IsolateDataSerializeInfo>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(const IsolateDataSerializeInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("Write<IsolateDataSerializeInfo>() %s\n", str.c_str());
}
size_t written_total = WriteVector<SnapshotIndex>(data.primitive_values);
written_total += WriteVector<PropInfo>(data.template_values);
Debug("Write<IsolateDataSerializeInfo>() wrote %d bytes\n", written_total);
return written_total;
}
template <>
RealmSerializeInfo SnapshotDeserializer::Read() {
Debug("Read<RealmSerializeInfo>()\n");
RealmSerializeInfo result;
result.builtins = ReadVector<std::string>();
result.persistent_values = ReadVector<PropInfo>();
result.native_objects = ReadVector<PropInfo>();
result.context = ReadArithmetic<SnapshotIndex>();
return result;
}
template <>
size_t SnapshotSerializer::Write(const RealmSerializeInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("\nWrite<RealmSerializeInfo>() %s\n", str.c_str());
}
// Use += here to ensure order of evaluation.
size_t written_total = WriteVector<std::string>(data.builtins);
written_total += WriteVector<PropInfo>(data.persistent_values);
written_total += WriteVector<PropInfo>(data.native_objects);
written_total += WriteArithmetic<SnapshotIndex>(data.context);
Debug("Write<RealmSerializeInfo>() wrote %d bytes\n", written_total);
return written_total;
}
template <>
EnvSerializeInfo SnapshotDeserializer::Read() {
Debug("Read<EnvSerializeInfo>()\n");
EnvSerializeInfo result;
result.async_hooks = Read<AsyncHooks::SerializeInfo>();
result.tick_info = Read<TickInfo::SerializeInfo>();
result.immediate_info = Read<ImmediateInfo::SerializeInfo>();
result.timeout_info = ReadArithmetic<AliasedBufferIndex>();
result.performance_state =
Read<performance::PerformanceState::SerializeInfo>();
result.exit_info = ReadArithmetic<AliasedBufferIndex>();
result.stream_base_state = ReadArithmetic<AliasedBufferIndex>();
result.should_abort_on_uncaught_toggle = ReadArithmetic<AliasedBufferIndex>();
result.principal_realm = Read<RealmSerializeInfo>();
return result;
}
template <>
size_t SnapshotSerializer::Write(const EnvSerializeInfo& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("\nWrite<EnvSerializeInfo>() %s\n", str.c_str());
}
// Use += here to ensure order of evaluation.
size_t written_total = Write<AsyncHooks::SerializeInfo>(data.async_hooks);
written_total += Write<TickInfo::SerializeInfo>(data.tick_info);
written_total += Write<ImmediateInfo::SerializeInfo>(data.immediate_info);
written_total += WriteArithmetic<AliasedBufferIndex>(data.timeout_info);
written_total += Write<performance::PerformanceState::SerializeInfo>(
data.performance_state);
written_total += WriteArithmetic<AliasedBufferIndex>(data.exit_info);
written_total += WriteArithmetic<AliasedBufferIndex>(data.stream_base_state);
written_total +=
WriteArithmetic<AliasedBufferIndex>(data.should_abort_on_uncaught_toggle);
written_total += Write<RealmSerializeInfo>(data.principal_realm);
Debug("Write<EnvSerializeInfo>() wrote %d bytes\n", written_total);
return written_total;
}
// Layout of SnapshotMetadata
// [ 1 byte ] type of the snapshot
// [ 4/8 bytes ] length of the node version string
// [ ... ] |length| bytes of node version
// [ 4/8 bytes ] length of the node arch string
// [ ... ] |length| bytes of node arch
// [ 4/8 bytes ] length of the node platform string
// [ ... ] |length| bytes of node platform
// [ 4 bytes ] v8 cache version tag
template <>
SnapshotMetadata SnapshotDeserializer::Read() {
Debug("Read<SnapshotMetadata>()\n");
SnapshotMetadata result;
result.type = static_cast<SnapshotMetadata::Type>(ReadArithmetic<uint8_t>());
result.node_version = ReadString();
result.node_arch = ReadString();
result.node_platform = ReadString();
result.v8_cache_version_tag = ReadArithmetic<uint32_t>();
if (is_debug) {
std::string str = ToStr(result);
Debug("Read<SnapshotMetadata>() %s\n", str.c_str());
}
return result;
}
template <>
size_t SnapshotSerializer::Write(const SnapshotMetadata& data) {
if (is_debug) {
std::string str = ToStr(data);
Debug("\nWrite<SnapshotMetadata>() %s\n", str.c_str());
}
size_t written_total = 0;
// We need the Node.js version, platform and arch to match because
// Node.js may perform synchronizations that are platform-specific and they
// can be changed in semver-patches.
Debug("Write snapshot type %d\n", static_cast<uint8_t>(data.type));
written_total += WriteArithmetic<uint8_t>(static_cast<uint8_t>(data.type));
Debug("Write Node.js version %s\n", data.node_version.c_str());
written_total += WriteString(data.node_version);
Debug("Write Node.js arch %s\n", data.node_arch);
written_total += WriteString(data.node_arch);
Debug("Write Node.js platform %s\n", data.node_platform);
written_total += WriteString(data.node_platform);
Debug("Write V8 cached data version tag %" PRIx32 "\n",
data.v8_cache_version_tag);
written_total += WriteArithmetic<uint32_t>(data.v8_cache_version_tag);
return written_total;
}
// Layout of the snapshot blob
// [ 4 bytes ] kMagic
// [ 4/8 bytes ] length of Node.js version string
// [ ... ] contents of Node.js version string
// [ 4/8 bytes ] length of Node.js arch string
// [ ... ] contents of Node.js arch string
// [ ... ] v8_snapshot_blob_data from SnapshotCreator::CreateBlob()
// [ ... ] isolate_data_info
// [ ... ] env_info
// [ ... ] code_cache
std::vector<char> SnapshotData::ToBlob() const {
SnapshotSerializer w;
w.Debug("SnapshotData::ToBlob()\n");
size_t written_total = 0;
// Metadata
w.Debug("Write magic %" PRIx32 "\n", kMagic);
written_total += w.WriteArithmetic<uint32_t>(kMagic);
w.Debug("Write metadata\n");
written_total += w.Write<SnapshotMetadata>(metadata);
written_total += w.Write<v8::StartupData>(v8_snapshot_blob_data);
w.Debug("Write isolate_data_indices\n");
written_total += w.Write<IsolateDataSerializeInfo>(isolate_data_info);
written_total += w.Write<EnvSerializeInfo>(env_info);
w.Debug("Write code_cache\n");
written_total += w.WriteVector<builtins::CodeCacheInfo>(code_cache);
w.Debug("SnapshotData::ToBlob() Wrote %d bytes\n", written_total);
return w.sink;
}
void SnapshotData::ToFile(FILE* out) const {
const std::vector<char> sink = ToBlob();
size_t num_written = fwrite(sink.data(), sink.size(), 1, out);
CHECK_EQ(num_written, 1);
CHECK_EQ(fflush(out), 0);
}
const SnapshotData* SnapshotData::FromEmbedderWrapper(
const EmbedderSnapshotData* data) {
return data != nullptr ? data->impl_ : nullptr;
}
EmbedderSnapshotData::Pointer SnapshotData::AsEmbedderWrapper() const {
return EmbedderSnapshotData::Pointer{new EmbedderSnapshotData(this, false)};
}
bool SnapshotData::FromFile(SnapshotData* out, FILE* in) {
return FromBlob(out, ReadFileSync(in));
}
bool SnapshotData::FromBlob(SnapshotData* out, const std::vector<char>& in) {
return FromBlob(out, std::string_view(in.data(), in.size()));
}
bool SnapshotData::FromBlob(SnapshotData* out, std::string_view in) {
SnapshotDeserializer r(in);
r.Debug("SnapshotData::FromBlob()\n");
DCHECK_EQ(out->data_ownership, SnapshotData::DataOwnership::kOwned);
// Metadata
uint32_t magic = r.ReadArithmetic<uint32_t>();
r.Debug("Read magic %" PRIx32 "\n", magic);
CHECK_EQ(magic, kMagic);
out->metadata = r.Read<SnapshotMetadata>();
r.Debug("Read metadata\n");
if (!out->Check()) {
return false;
}
out->v8_snapshot_blob_data = r.Read<v8::StartupData>();
r.Debug("Read isolate_data_info\n");
out->isolate_data_info = r.Read<IsolateDataSerializeInfo>();
out->env_info = r.Read<EnvSerializeInfo>();
r.Debug("Read code_cache\n");
out->code_cache = r.ReadVector<builtins::CodeCacheInfo>();
r.Debug("SnapshotData::FromBlob() read %d bytes\n", r.read_total);
return true;
}
bool SnapshotData::Check() const {
if (metadata.node_version != per_process::metadata.versions.node) {
fprintf(stderr,
"Failed to load the startup snapshot because it was built with"
"Node.js version %s and the current Node.js version is %s.\n",
metadata.node_version.c_str(),
NODE_VERSION);
return false;
}
if (metadata.node_arch != per_process::metadata.arch) {
fprintf(stderr,
"Failed to load the startup snapshot because it was built with"
"architecture %s and the architecture is %s.\n",
metadata.node_arch.c_str(),
NODE_ARCH);
return false;
}
if (metadata.node_platform != per_process::metadata.platform) {
fprintf(stderr,
"Failed to load the startup snapshot because it was built with"
"platform %s and the current platform is %s.\n",
metadata.node_platform.c_str(),
NODE_PLATFORM);
return false;
}
uint32_t current_cache_version = v8::ScriptCompiler::CachedDataVersionTag();
if (metadata.v8_cache_version_tag != current_cache_version &&
metadata.type == SnapshotMetadata::Type::kFullyCustomized) {
// For now we only do this check for the customized snapshots - we know
// that the flags we use in the default snapshot are limited and safe
// enough so we can relax the constraints for it.
fprintf(stderr,
"Failed to load the startup snapshot because it was built with "
"a different version of V8 or with different V8 configurations.\n"
"Expected tag %" PRIx32 ", read %" PRIx32 "\n",
current_cache_version,
metadata.v8_cache_version_tag);
return false;
}
// TODO(joyeecheung): check incompatible Node.js flags.
return true;
}
SnapshotData::~SnapshotData() {
if (data_ownership == DataOwnership::kOwned &&
v8_snapshot_blob_data.data != nullptr) {
delete[] v8_snapshot_blob_data.data;
}
}
static std::string GetCodeCacheDefName(const std::string& id) {
char buf[64] = {0};
size_t size = id.size();
CHECK_LT(size, sizeof(buf));
for (size_t i = 0; i < size; ++i) {
char ch = id[i];
buf[i] = (ch == '-' || ch == '/') ? '_' : ch;
}
return std::string(buf) + std::string("_cache_data");
}
static std::string FormatSize(size_t size) {
char buf[64] = {0};
if (size < 1024) {
snprintf(buf, sizeof(buf), "%.2fB", static_cast<double>(size));
} else if (size < 1024 * 1024) {
snprintf(buf, sizeof(buf), "%.2fKB", static_cast<double>(size / 1024));
} else {
snprintf(
buf, sizeof(buf), "%.2fMB", static_cast<double>(size / 1024 / 1024));
}
return buf;
}
std::string ToOctalString(const uint8_t ch) {
// We can print most printable characters directly. The exceptions are '\'
// (escape characters), " (would end the string), and ? (trigraphs). The
// latter may be overly conservative: we compile with C++17 which doesn't
// support trigraphs.
if (ch >= ' ' && ch <= '~' && ch != '\\' && ch != '"' && ch != '?') {
return std::string(1, static_cast<char>(ch));
}
// All other characters are blindly output as octal.
const char c0 = '0' + ((ch >> 6) & 7);
const char c1 = '0' + ((ch >> 3) & 7);
const char c2 = '0' + (ch & 7);
return std::string("\\") + c0 + c1 + c2;
}
std::vector<std::string> GetOctalTable() {
size_t size = 1 << 8;
std::vector<std::string> code_table(size);
for (size_t i = 0; i < size; ++i) {
code_table[i] = ToOctalString(static_cast<uint8_t>(i));
}
return code_table;
}
const std::string& GetOctalCode(uint8_t index) {
static std::vector<std::string> table = GetOctalTable();
return table[index];
}
template <typename T>
void WriteByteVectorLiteral(std::ostream* ss,
const T* vec,
size_t size,
const char* var_name,
bool use_string_literals) {
constexpr bool is_uint8_t = std::is_same_v<T, uint8_t>;
static_assert(is_uint8_t || std::is_same_v<T, char>);
constexpr const char* type_name = is_uint8_t ? "uint8_t" : "char";
if (use_string_literals) {
const uint8_t* data = reinterpret_cast<const uint8_t*>(vec);
*ss << "static const " << type_name << " *" << var_name << " = ";
*ss << (is_uint8_t ? R"(reinterpret_cast<const uint8_t *>(")" : "\"");
for (size_t i = 0; i < size; i++) {
const uint8_t ch = data[i];
*ss << GetOctalCode(ch);
if (i % 64 == 63) {
// Go to a newline every 64 bytes since many text editors have
// problems with very long lines.
*ss << "\"\n\"";
}
}
*ss << (is_uint8_t ? "\");\n" : "\";\n");
} else {
*ss << "static const " << type_name << " " << var_name << "[] = {";
for (size_t i = 0; i < size; i++) {
*ss << std::to_string(vec[i]) << (i == size - 1 ? '\n' : ',');
if (i % 64 == 63) {
// Print a newline every 64 units and a offset to improve
// readability.
*ss << " // " << (i / 64) << "\n";
}
}
*ss << "};\n";
}
}
static void WriteCodeCacheInitializer(std::ostream* ss,
const std::string& id,
size_t size) {
std::string def_name = GetCodeCacheDefName(id);
*ss << " { \"" << id << "\",\n";
*ss << " {" << def_name << ",\n";
*ss << " " << size << ",\n";
*ss << " }\n";
*ss << " },\n";
}
void FormatBlob(std::ostream& ss,
const SnapshotData* data,
bool use_string_literals) {
ss << R"(#include <cstddef>
#include "env.h"
#include "node_snapshot_builder.h"
#include "v8.h"
// This file is generated by tools/snapshot. Do not edit.
namespace node {
)";
WriteByteVectorLiteral(&ss,
data->v8_snapshot_blob_data.data,
data->v8_snapshot_blob_data.raw_size,
"v8_snapshot_blob_data",
use_string_literals);
ss << R"(static const int v8_snapshot_blob_size = )"
<< data->v8_snapshot_blob_data.raw_size << ";\n";
// Windows can't deal with too many large vector initializers.
// Store the data into static arrays first.
for (const auto& item : data->code_cache) {
std::string var_name = GetCodeCacheDefName(item.id);
WriteByteVectorLiteral(&ss,
item.data.data,
item.data.length,
var_name.c_str(),
use_string_literals);
}
ss << R"(const SnapshotData snapshot_data {
// -- data_ownership begins --
SnapshotData::DataOwnership::kNotOwned,
// -- data_ownership ends --
// -- metadata begins --
)" << data->metadata
<< R"(,
// -- metadata ends --
// -- v8_snapshot_blob_data begins --
{ v8_snapshot_blob_data, v8_snapshot_blob_size },
// -- v8_snapshot_blob_data ends --
// -- isolate_data_info begins --
)" << data->isolate_data_info
<< R"(
// -- isolate_data_info ends --
,
// -- env_info begins --
)" << data->env_info
<< R"(
// -- env_info ends --
,
// -- code_cache begins --
{)";
for (const auto& item : data->code_cache) {
WriteCodeCacheInitializer(&ss, item.id, item.data.length);
}
ss << R"(
}
// -- code_cache ends --
};
const SnapshotData* SnapshotBuilder::GetEmbeddedSnapshotData() {
return &snapshot_data;
}
} // namespace node
)";
}
// Reset context settings that need to be initialized again after
// deserialization.
static void ResetContextSettingsBeforeSnapshot(Local<Context> context) {
// Reset the AllowCodeGenerationFromStrings flag to true (default value) so
// that it can be re-initialized with v8 flag
// --disallow-code-generation-from-strings and recognized in
// node::InitializeContextRuntime.
context->AllowCodeGenerationFromStrings(true);
}
const std::vector<intptr_t>& SnapshotBuilder::CollectExternalReferences() {
static auto registry = std::make_unique<ExternalReferenceRegistry>();
return registry->external_references();
}
void SnapshotBuilder::InitializeIsolateParams(const SnapshotData* data,
Isolate::CreateParams* params) {
CHECK_NULL(params->external_references);
CHECK_NULL(params->snapshot_blob);
params->external_references = CollectExternalReferences().data();
params->snapshot_blob =
const_cast<v8::StartupData*>(&(data->v8_snapshot_blob_data));
}
ExitCode SnapshotBuilder::Generate(
SnapshotData* out,
const std::vector<std::string>& args,
const std::vector<std::string>& exec_args,
std::optional<std::string_view> main_script) {
// The default snapshot is meant to be runtime-independent and has more
// restrictions. We do not enable the inspector and do not run the event
// loop when building the default snapshot to avoid inconsistencies, but
// we do for the fully customized one, and they are expected to fixup the
// inconsistencies using v8.startupSnapshot callbacks.
SnapshotMetadata::Type snapshot_type =
main_script.has_value() ? SnapshotMetadata::Type::kFullyCustomized
: SnapshotMetadata::Type::kDefault;
std::vector<std::string> errors;
auto setup = CommonEnvironmentSetup::CreateForSnapshotting(
per_process::v8_platform.Platform(), &errors, args, exec_args);
if (!setup) {
for (const std::string& err : errors)
fprintf(stderr, "%s: %s\n", args[0].c_str(), err.c_str());
return ExitCode::kBootstrapFailure;
}
Isolate* isolate = setup->isolate();
{
HandleScope scope(isolate);
TryCatch bootstrapCatch(isolate);
auto print_Exception = OnScopeLeave([&]() {
if (bootstrapCatch.HasCaught()) {
PrintCaughtException(
isolate, isolate->GetCurrentContext(), bootstrapCatch);
}
});
// Run the custom main script for fully customized snapshots.
if (snapshot_type == SnapshotMetadata::Type::kFullyCustomized) {
Context::Scope context_scope(setup->context());
Environment* env = setup->env();
#if HAVE_INSPECTOR
env->InitializeInspector({});
#endif
if (LoadEnvironment(env, main_script.value()).IsEmpty()) {
return ExitCode::kGenericUserError;
}
// FIXME(joyeecheung): right now running the loop in the snapshot
// builder might introduce inconsistencies in JS land that need to
// be synchronized again after snapshot restoration.
ExitCode exit_code =
SpinEventLoopInternal(env).FromMaybe(ExitCode::kGenericUserError);
if (exit_code != ExitCode::kNoFailure) {
return exit_code;
}
}
}
return CreateSnapshot(out, setup.get(), static_cast<uint8_t>(snapshot_type));
}
ExitCode SnapshotBuilder::CreateSnapshot(SnapshotData* out,
CommonEnvironmentSetup* setup,
uint8_t snapshot_type_u8) {
SnapshotMetadata::Type snapshot_type =
static_cast<SnapshotMetadata::Type>(snapshot_type_u8);
Isolate* isolate = setup->isolate();
Environment* env = setup->env();
SnapshotCreator* creator = setup->snapshot_creator();
{
HandleScope scope(isolate);
Local<Context> main_context = setup->context();
// The default context with only things created by V8.
Local<Context> default_context = Context::New(isolate);
// The context used by the vm module.
Local<Context> vm_context;
{
Local<ObjectTemplate> global_template =
setup->isolate_data()->contextify_global_template();
CHECK(!global_template.IsEmpty());
if (!contextify::ContextifyContext::CreateV8Context(
isolate, global_template, nullptr, nullptr)
.ToLocal(&vm_context)) {
return ExitCode::kStartupSnapshotFailure;
}
}
// The Node.js-specific context with primodials, can be used by workers