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bootstrap: use SnapshotData to pass snapshot data around
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Instead of passing the snapshot blob, the per-isolate data
indices and the EnvSerializeInfo separately, use the aggregate
type Snapshot to carry these around, and refactor
NodeMainInstance so that it owns the v8::Isolate::CreateParams
when it owns its isolate. This also gets rid of the owns_isolate_
and deserialize_mode_ booleans in NodeMainInstance since
NodeMainInstance can compute these by just checking if it has
pointers to the CreateParams or the SnapshotData.

PR-URL: #42360
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
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joyeecheung authored and juanarbol committed Apr 4, 2022
1 parent eb7f133 commit a6801f9
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Showing 7 changed files with 72 additions and 95 deletions.
2 changes: 1 addition & 1 deletion src/env.h
Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@
#include "node_binding.h"
#include "node_external_reference.h"
#include "node_main_instance.h"
#include "node_native_module.h"
#include "node_options.h"
#include "node_perf_common.h"
#include "node_snapshotable.h"
Expand Down Expand Up @@ -972,7 +973,6 @@ struct EnvSerializeInfo {
};

struct SnapshotData {
SnapshotData() { blob.data = nullptr; }
v8::StartupData blob;
std::vector<size_t> isolate_data_indices;
EnvSerializeInfo env_info;
Expand Down
21 changes: 6 additions & 15 deletions src/node.cc
Original file line number Diff line number Diff line change
Expand Up @@ -1145,28 +1145,19 @@ int Start(int argc, char** argv) {
}

{
Isolate::CreateParams params;
const std::vector<size_t>* indices = nullptr;
const EnvSerializeInfo* env_info = nullptr;
bool use_node_snapshot =
per_process::cli_options->per_isolate->node_snapshot;
if (use_node_snapshot) {
v8::StartupData* blob = NodeMainInstance::GetEmbeddedSnapshotBlob();
if (blob != nullptr) {
params.snapshot_blob = blob;
indices = NodeMainInstance::GetIsolateDataIndices();
env_info = NodeMainInstance::GetEnvSerializeInfo();
}
}
const SnapshotData* snapshot_data =
use_node_snapshot ? NodeMainInstance::GetEmbeddedSnapshotData()
: nullptr;
uv_loop_configure(uv_default_loop(), UV_METRICS_IDLE_TIME);

NodeMainInstance main_instance(&params,
NodeMainInstance main_instance(snapshot_data,
uv_default_loop(),
per_process::v8_platform.Platform(),
result.args,
result.exec_args,
indices);
result.exit_code = main_instance.Run(env_info);
result.exec_args);
result.exit_code = main_instance.Run();
}

TearDownOncePerProcess();
Expand Down
71 changes: 36 additions & 35 deletions src/node_main_instance.cc
Original file line number Diff line number Diff line change
Expand Up @@ -36,8 +36,7 @@ NodeMainInstance::NodeMainInstance(Isolate* isolate,
isolate_(isolate),
platform_(platform),
isolate_data_(nullptr),
owns_isolate_(false),
deserialize_mode_(false) {
snapshot_data_(nullptr) {
isolate_data_ =
std::make_unique<IsolateData>(isolate_, event_loop, platform, nullptr);

Expand All @@ -61,77 +60,81 @@ std::unique_ptr<NodeMainInstance> NodeMainInstance::Create(
new NodeMainInstance(isolate, event_loop, platform, args, exec_args));
}

NodeMainInstance::NodeMainInstance(
Isolate::CreateParams* params,
uv_loop_t* event_loop,
MultiIsolatePlatform* platform,
const std::vector<std::string>& args,
const std::vector<std::string>& exec_args,
const std::vector<size_t>* per_isolate_data_indexes)
NodeMainInstance::NodeMainInstance(const SnapshotData* snapshot_data,
uv_loop_t* event_loop,
MultiIsolatePlatform* platform,
const std::vector<std::string>& args,
const std::vector<std::string>& exec_args)
: args_(args),
exec_args_(exec_args),
array_buffer_allocator_(ArrayBufferAllocator::Create()),
isolate_(nullptr),
platform_(platform),
isolate_data_(nullptr),
owns_isolate_(true) {
params->array_buffer_allocator = array_buffer_allocator_.get();
deserialize_mode_ = per_isolate_data_indexes != nullptr;
if (deserialize_mode_) {
isolate_data_(),
isolate_params_(std::make_unique<Isolate::CreateParams>()),
snapshot_data_(snapshot_data) {
isolate_params_->array_buffer_allocator = array_buffer_allocator_.get();
if (snapshot_data != nullptr) {
// TODO(joyeecheung): collect external references and set it in
// params.external_references.
const std::vector<intptr_t>& external_references =
CollectExternalReferences();
params->external_references = external_references.data();
isolate_params_->external_references = external_references.data();
isolate_params_->snapshot_blob =
const_cast<v8::StartupData*>(&(snapshot_data->blob));
}

isolate_ = Isolate::Allocate();
CHECK_NOT_NULL(isolate_);
// Register the isolate on the platform before the isolate gets initialized,
// so that the isolate can access the platform during initialization.
platform->RegisterIsolate(isolate_, event_loop);
SetIsolateCreateParamsForNode(params);
Isolate::Initialize(isolate_, *params);
SetIsolateCreateParamsForNode(isolate_params_.get());
Isolate::Initialize(isolate_, *isolate_params_);

// If the indexes are not nullptr, we are not deserializing
CHECK_IMPLIES(deserialize_mode_, params->external_references != nullptr);
isolate_data_ = std::make_unique<IsolateData>(isolate_,
event_loop,
platform,
array_buffer_allocator_.get(),
per_isolate_data_indexes);
isolate_data_ = std::make_unique<IsolateData>(
isolate_,
event_loop,
platform,
array_buffer_allocator_.get(),
snapshot_data == nullptr ? nullptr
: &(snapshot_data->isolate_data_indices));
IsolateSettings s;
SetIsolateMiscHandlers(isolate_, s);
if (!deserialize_mode_) {
if (snapshot_data == nullptr) {
// If in deserialize mode, delay until after the deserialization is
// complete.
SetIsolateErrorHandlers(isolate_, s);
}
isolate_data_->max_young_gen_size =
params->constraints.max_young_generation_size_in_bytes();
isolate_params_->constraints.max_young_generation_size_in_bytes();
}

void NodeMainInstance::Dispose() {
CHECK(!owns_isolate_);
// This should only be called on a main instance that does not own its
// isolate.
CHECK_NULL(isolate_params_);
platform_->DrainTasks(isolate_);
}

NodeMainInstance::~NodeMainInstance() {
if (!owns_isolate_) {
if (isolate_params_ == nullptr) {
return;
}
// This should only be done on a main instance that owns its isolate.
platform_->UnregisterIsolate(isolate_);
isolate_->Dispose();
}

int NodeMainInstance::Run(const EnvSerializeInfo* env_info) {
int NodeMainInstance::Run() {
Locker locker(isolate_);
Isolate::Scope isolate_scope(isolate_);
HandleScope handle_scope(isolate_);

int exit_code = 0;
DeleteFnPtr<Environment, FreeEnvironment> env =
CreateMainEnvironment(&exit_code, env_info);
CreateMainEnvironment(&exit_code);
CHECK_NOT_NULL(env);

Context::Scope context_scope(env->context());
Expand Down Expand Up @@ -167,8 +170,7 @@ void NodeMainInstance::Run(int* exit_code, Environment* env) {
}

DeleteFnPtr<Environment, FreeEnvironment>
NodeMainInstance::CreateMainEnvironment(int* exit_code,
const EnvSerializeInfo* env_info) {
NodeMainInstance::CreateMainEnvironment(int* exit_code) {
*exit_code = 0; // Reset the exit code to 0

HandleScope handle_scope(isolate_);
Expand All @@ -179,16 +181,15 @@ NodeMainInstance::CreateMainEnvironment(int* exit_code,
isolate_->GetHeapProfiler()->StartTrackingHeapObjects(true);
}

CHECK_IMPLIES(deserialize_mode_, env_info != nullptr);
Local<Context> context;
DeleteFnPtr<Environment, FreeEnvironment> env;

if (deserialize_mode_) {
if (snapshot_data_ != nullptr) {
env.reset(new Environment(isolate_data_.get(),
isolate_,
args_,
exec_args_,
env_info,
&(snapshot_data_->env_info),
EnvironmentFlags::kDefaultFlags,
{}));
context = Context::FromSnapshot(isolate_,
Expand All @@ -200,7 +201,7 @@ NodeMainInstance::CreateMainEnvironment(int* exit_code,
Context::Scope context_scope(context);
CHECK(InitializeContextRuntime(context).IsJust());
SetIsolateErrorHandlers(isolate_, {});
env->InitializeMainContext(context, env_info);
env->InitializeMainContext(context, &(snapshot_data_->env_info));
#if HAVE_INSPECTOR
env->InitializeInspector({});
#endif
Expand Down
25 changes: 11 additions & 14 deletions src/node_main_instance.h
Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ namespace node {

class ExternalReferenceRegistry;
struct EnvSerializeInfo;
struct SnapshotData;

// TODO(joyeecheung): align this with the Worker/WorkerThreadData class.
// We may be able to create an abstract class to reuse some of the routines.
Expand Down Expand Up @@ -48,29 +49,25 @@ class NodeMainInstance {
void Dispose();

// Create a main instance that owns the isolate
NodeMainInstance(
v8::Isolate::CreateParams* params,
uv_loop_t* event_loop,
MultiIsolatePlatform* platform,
const std::vector<std::string>& args,
const std::vector<std::string>& exec_args,
const std::vector<size_t>* per_isolate_data_indexes = nullptr);
NodeMainInstance(const SnapshotData* snapshot_data,
uv_loop_t* event_loop,
MultiIsolatePlatform* platform,
const std::vector<std::string>& args,
const std::vector<std::string>& exec_args);
~NodeMainInstance();

// Start running the Node.js instances, return the exit code when finished.
int Run(const EnvSerializeInfo* env_info);
int Run();
void Run(int* exit_code, Environment* env);

IsolateData* isolate_data() { return isolate_data_.get(); }

DeleteFnPtr<Environment, FreeEnvironment> CreateMainEnvironment(
int* exit_code, const EnvSerializeInfo* env_info);
int* exit_code);

// If nullptr is returned, the binary is not built with embedded
// snapshot.
static const std::vector<size_t>* GetIsolateDataIndices();
static v8::StartupData* GetEmbeddedSnapshotBlob();
static const EnvSerializeInfo* GetEnvSerializeInfo();
static const SnapshotData* GetEmbeddedSnapshotData();
static const std::vector<intptr_t>& CollectExternalReferences();

static const size_t kNodeContextIndex = 0;
Expand All @@ -93,8 +90,8 @@ class NodeMainInstance {
v8::Isolate* isolate_;
MultiIsolatePlatform* platform_;
std::unique_ptr<IsolateData> isolate_data_;
bool owns_isolate_ = false;
bool deserialize_mode_ = false;
std::unique_ptr<v8::Isolate::CreateParams> isolate_params_;
const SnapshotData* snapshot_data_ = nullptr;
};

} // namespace node
Expand Down
10 changes: 1 addition & 9 deletions src/node_snapshot_stub.cc
Original file line number Diff line number Diff line change
Expand Up @@ -6,15 +6,7 @@

namespace node {

v8::StartupData* NodeMainInstance::GetEmbeddedSnapshotBlob() {
return nullptr;
}

const std::vector<size_t>* NodeMainInstance::GetIsolateDataIndices() {
return nullptr;
}

const EnvSerializeInfo* NodeMainInstance::GetEnvSerializeInfo() {
const SnapshotData* NodeMainInstance::GetEmbeddedSnapshotData() {
return nullptr;
}

Expand Down
35 changes: 16 additions & 19 deletions src/node_snapshotable.cc
Original file line number Diff line number Diff line change
Expand Up @@ -53,31 +53,28 @@ static const char blob_data[] = {
static const int blob_size = )"
<< data->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_indices {
SnapshotData snapshot_data {
// -- blob begins --
{ blob_data, blob_size },
// -- blob ends --
// -- isolate_data_indices begins --
{
)";
WriteVector(&ss,
data->isolate_data_indices.data(),
data->isolate_data_indices.size());
ss << R"(};
const std::vector<size_t>* NodeMainInstance::GetIsolateDataIndices() {
return &isolate_data_indices;
ss << R"(},
// -- isolate_data_indices ends --
// -- env_info begins --
)" << data->env_info
<< R"(
// -- env_info ends --
};
const SnapshotData* NodeMainInstance::GetEmbeddedSnapshotData() {
return &snapshot_data;
}
static const EnvSerializeInfo env_info )"
<< data->env_info << R"(;
const EnvSerializeInfo* NodeMainInstance::GetEnvSerializeInfo() {
return &env_info;
}
} // namespace node
)";

Expand Down
3 changes: 1 addition & 2 deletions tools/snapshot/README.md
Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,7 @@ In the default build of the Node.js executable, to embed a V8 startup snapshot
into the Node.js executable, `libnode` is first built with these unresolved
symbols:

- `node::NodeMainInstance::GetEmbeddedSnapshotBlob`
- `node::NodeMainInstance::GetIsolateDataIndices`
- `node::NodeMainInstance::GetEmbeddedSnapshotData`

Then the `node_mksnapshot` executable is built with C++ files in this
directory, as well as `src/node_snapshot_stub.cc` which defines the unresolved
Expand Down

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