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src: define per-isolate internal bindings registration callback
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Bindings that need to be loaded in distinct contexts of node::Realm in
the same node::Environment instance needs to share the per-isolate
templates.

Add a new binding registration callback, which is called with
per-IsolateData. This allows bindings to define templates and
share them across realms eagerly, and avoid accidental modification on
the templates when the per-context callback is called multiple times.

This also tracks loaded bindings and built-in modules with node::Realm.
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@legendecas
legendecas committed Nov 29, 2022
1 parent d579bc1 commit f762397
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Showing 13 changed files with 230 additions and 129 deletions.
3 changes: 3 additions & 0 deletions src/env-inl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -827,6 +827,7 @@ void Environment::set_process_exit_handler(
#undef VY
#undef VP

#define VM(PropertyName) V(PropertyName##_binding, v8::FunctionTemplate)
#define V(PropertyName, TypeName) \
inline v8::Local<TypeName> IsolateData::PropertyName() const { \
return PropertyName##_.Get(isolate_); \
Expand All @@ -835,7 +836,9 @@ void Environment::set_process_exit_handler(
PropertyName##_.Set(isolate_, value); \
}
PER_ISOLATE_TEMPLATE_PROPERTIES(V)
NODE_BUILTIN_PER_ISOLATE_BINDINGS(VM)
#undef V
#undef VM

#define VP(PropertyName, StringValue) V(v8::Private, PropertyName)
#define VY(PropertyName, StringValue) V(v8::Symbol, PropertyName)
Expand Down
26 changes: 5 additions & 21 deletions src/env.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -314,6 +314,7 @@ IsolateDataSerializeInfo IsolateData::Serialize(SnapshotCreator* creator) {
info.primitive_values.push_back(creator->AddData(async_wrap_provider(i)));

uint32_t id = 0;
#define VM(PropertyName) V(PropertyName##_binding, FunctionTemplate)
#define V(PropertyName, TypeName) \
do { \
Local<TypeName> field = PropertyName(); \
Expand All @@ -324,6 +325,7 @@ IsolateDataSerializeInfo IsolateData::Serialize(SnapshotCreator* creator) {
id++; \
} while (0);
PER_ISOLATE_TEMPLATE_PROPERTIES(V)
NODE_BUILTIN_PER_ISOLATE_BINDINGS(VM)
#undef V

return info;
Expand Down Expand Up @@ -368,6 +370,7 @@ void IsolateData::DeserializeProperties(const IsolateDataSerializeInfo* info) {
const std::vector<PropInfo>& values = info->template_values;
i = 0; // index to the array
uint32_t id = 0;
#define VM(PropertyName) V(PropertyName##_binding, FunctionTemplate)
#define V(PropertyName, TypeName) \
do { \
if (values.size() > i && id == values[i].id) { \
Expand All @@ -388,6 +391,7 @@ void IsolateData::DeserializeProperties(const IsolateDataSerializeInfo* info) {
} while (0);

PER_ISOLATE_TEMPLATE_PROPERTIES(V);
NODE_BUILTIN_PER_ISOLATE_BINDINGS(VM);
#undef V
}

Expand Down Expand Up @@ -454,12 +458,12 @@ void IsolateData::CreateProperties() {
NODE_ASYNC_PROVIDER_TYPES(V)
#undef V

// TODO(legendecas): eagerly create per isolate templates.
Local<FunctionTemplate> templ = FunctionTemplate::New(isolate());
templ->InstanceTemplate()->SetInternalFieldCount(
BaseObject::kInternalFieldCount);
templ->Inherit(BaseObject::GetConstructorTemplate(this));
set_binding_data_ctor_template(templ);
binding::CreateInternalBindingTemplates(this);

contextify::ContextifyContext::InitializeGlobalTemplates(this);
}
Expand Down Expand Up @@ -1581,30 +1585,13 @@ void Environment::PrintInfoForSnapshotIfDebug() {
if (enabled_debug_list()->enabled(DebugCategory::MKSNAPSHOT)) {
fprintf(stderr, "At the exit of the Environment:\n");
principal_realm()->PrintInfoForSnapshot();
fprintf(stderr, "\nNative modules without cache:\n");
for (const auto& s : builtins_without_cache) {
fprintf(stderr, "%s\n", s.c_str());
}
fprintf(stderr, "\nNative modules with cache:\n");
for (const auto& s : builtins_with_cache) {
fprintf(stderr, "%s\n", s.c_str());
}
fprintf(stderr, "\nStatic bindings (need to be registered):\n");
for (const auto mod : internal_bindings) {
fprintf(stderr, "%s:%s\n", mod->nm_filename, mod->nm_modname);
}
}
}

EnvSerializeInfo Environment::Serialize(SnapshotCreator* creator) {
EnvSerializeInfo info;
Local<Context> ctx = context();

// Currently all modules are compiled without cache in builtin snapshot
// builder.
info.builtins = std::vector<std::string>(builtins_without_cache.begin(),
builtins_without_cache.end());

info.async_hooks = async_hooks_.Serialize(ctx, creator);
info.immediate_info = immediate_info_.Serialize(ctx, creator);
info.tick_info = tick_info_.Serialize(ctx, creator);
Expand Down Expand Up @@ -1650,7 +1637,6 @@ void Environment::DeserializeProperties(const EnvSerializeInfo* info) {

RunDeserializeRequests();

builtins_in_snapshot = info->builtins;
async_hooks_.Deserialize(ctx);
immediate_info_.Deserialize(ctx);
tick_info_.Deserialize(ctx);
Expand Down Expand Up @@ -1841,8 +1827,6 @@ void Environment::MemoryInfo(MemoryTracker* tracker) const {
// Iteratable STLs have their own sizes subtracted from the parent
// by default.
tracker->TrackField("isolate_data", isolate_data_);
tracker->TrackField("builtins_with_cache", builtins_with_cache);
tracker->TrackField("builtins_without_cache", builtins_without_cache);
tracker->TrackField("destroy_async_id_list", destroy_async_id_list_);
tracker->TrackField("exec_argv", exec_argv_);
tracker->TrackField("exit_info", exit_info_);
Expand Down
15 changes: 6 additions & 9 deletions src/env.h
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Original file line number Diff line number Diff line change
Expand Up @@ -155,11 +155,14 @@ class NODE_EXTERN_PRIVATE IsolateData : public MemoryRetainer {
#undef VS
#undef VP

#define VM(PropertyName) V(PropertyName##_binding, v8::FunctionTemplate)
#define V(PropertyName, TypeName) \
inline v8::Local<TypeName> PropertyName() const; \
inline void set_##PropertyName(v8::Local<TypeName> value);
PER_ISOLATE_TEMPLATE_PROPERTIES(V)
NODE_BUILTIN_PER_ISOLATE_BINDINGS(VM)
#undef V
#undef VM

inline v8::Local<v8::String> async_wrap_provider(int index) const;

Expand All @@ -179,15 +182,17 @@ class NODE_EXTERN_PRIVATE IsolateData : public MemoryRetainer {
#define VP(PropertyName, StringValue) V(v8::Private, PropertyName)
#define VY(PropertyName, StringValue) V(v8::Symbol, PropertyName)
#define VS(PropertyName, StringValue) V(v8::String, PropertyName)
#define VM(PropertyName) V(v8::FunctionTemplate, PropertyName##_binding)
#define VT(PropertyName, TypeName) V(TypeName, PropertyName)
#define V(TypeName, PropertyName) \
v8::Eternal<TypeName> PropertyName ## _;
PER_ISOLATE_PRIVATE_SYMBOL_PROPERTIES(VP)
PER_ISOLATE_SYMBOL_PROPERTIES(VY)
PER_ISOLATE_STRING_PROPERTIES(VS)
PER_ISOLATE_TEMPLATE_PROPERTIES(VT)
NODE_BUILTIN_PER_ISOLATE_BINDINGS(VM)
#undef V
#undef V
#undef VM
#undef VT
#undef VS
#undef VY
Expand Down Expand Up @@ -457,7 +462,6 @@ struct DeserializeRequest {
};

struct EnvSerializeInfo {
std::vector<std::string> builtins;
AsyncHooks::SerializeInfo async_hooks;
TickInfo::SerializeInfo tick_info;
ImmediateInfo::SerializeInfo immediate_info;
Expand Down Expand Up @@ -715,13 +719,6 @@ class Environment : public MemoryRetainer {
// List of id's that have been destroyed and need the destroy() cb called.
inline std::vector<double>* destroy_async_id_list();

std::set<struct node_module*> internal_bindings;
std::set<std::string> builtins_with_cache;
std::set<std::string> builtins_without_cache;
// This is only filled during deserialization. We use a vector since
// it's only used for tests.
std::vector<std::string> builtins_in_snapshot;

std::unordered_multimap<int, loader::ModuleWrap*> hash_to_module_map;
std::unordered_map<uint32_t, loader::ModuleWrap*> id_to_module_map;
std::unordered_map<uint32_t, contextify::ContextifyScript*>
Expand Down
97 changes: 71 additions & 26 deletions src/node_binding.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,6 @@
V(blob) \
V(block_list) \
V(buffer) \
V(builtins) \
V(cares_wrap) \
V(config) \
V(contextify) \
Expand Down Expand Up @@ -87,6 +86,7 @@
V(zlib)

#define NODE_BUILTIN_BINDINGS(V) \
NODE_BUILTIN_PER_ISOLATE_BINDINGS(V) \
NODE_BUILTIN_STANDARD_BINDINGS(V) \
NODE_BUILTIN_OPENSSL_BINDINGS(V) \
NODE_BUILTIN_ICU_BINDINGS(V) \
Expand All @@ -102,6 +102,12 @@
NODE_BUILTIN_BINDINGS(V)
#undef V

#define V(modname) \
void _register_isolate_##modname(node::IsolateData* isolate_data, \
v8::Local<v8::FunctionTemplate> target);
NODE_BUILTIN_PER_ISOLATE_BINDINGS(V)
#undef V

#ifdef _AIX
// On AIX, dlopen() behaves differently from other operating systems, in that
// it returns unique values from each call, rather than identical values, when
Expand Down Expand Up @@ -229,9 +235,12 @@ static bool libc_may_be_musl() { return false; }
namespace node {

using v8::Context;
using v8::EscapableHandleScope;
using v8::Exception;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Isolate;
using v8::Local;
using v8::Object;
using v8::String;
Expand Down Expand Up @@ -552,50 +561,86 @@ inline struct node_module* FindModule(struct node_module* list,
return mp;
}

static Local<Object> InitInternalBinding(Environment* env,
node_module* mod,
Local<String> module) {
// Internal bindings don't have a "module" object, only exports.
Local<Function> ctor = env->binding_data_ctor_template()
->GetFunction(env->context())
.ToLocalChecked();
Local<Object> exports = ctor->NewInstance(env->context()).ToLocalChecked();
void CreateInternalBindingTemplates(IsolateData* isolate_data) {
#define V(modname) \
do { \
Local<FunctionTemplate> templ = \
FunctionTemplate::New(isolate_data->isolate()); \
templ->InstanceTemplate()->SetInternalFieldCount( \
BaseObject::kInternalFieldCount); \
templ->Inherit(BaseObject::GetConstructorTemplate(isolate_data)); \
_register_isolate_##modname(isolate_data, templ); \
isolate_data->set_##modname##_binding(templ); \
} while (0);
NODE_BUILTIN_PER_ISOLATE_BINDINGS(V)
#undef V
}

static Local<Object> GetInternalBindingExportObject(IsolateData* isolate_data,
const char* mod_name,
Local<Context> context) {
Local<FunctionTemplate> ctor;
#define V(name) \
if (strcmp(mod_name, #name) == 0) { \
ctor = isolate_data->name##_binding(); \
} else // NOLINT(readability/braces)
NODE_BUILTIN_PER_ISOLATE_BINDINGS(V)
#undef V
{
ctor = isolate_data->binding_data_ctor_template();
}

Local<Object> obj = ctor->GetFunction(context)
.ToLocalChecked()
->NewInstance(context)
.ToLocalChecked();
return obj;
}

static Local<Object> InitInternalBinding(Realm* realm, node_module* mod) {
EscapableHandleScope scope(realm->isolate());
Local<Context> context = realm->context();
Local<Object> exports = GetInternalBindingExportObject(
realm->isolate_data(), mod->nm_modname, context);
CHECK_NULL(mod->nm_register_func);
CHECK_NOT_NULL(mod->nm_context_register_func);
Local<Value> unused = Undefined(env->isolate());
mod->nm_context_register_func(exports, unused, env->context(), mod->nm_priv);
return exports;
Local<Value> unused = Undefined(realm->isolate());
// Internal bindings don't have a "module" object, only exports.
mod->nm_context_register_func(exports, unused, context, mod->nm_priv);
return scope.Escape(exports);
}

void GetInternalBinding(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
Realm* realm = Realm::GetCurrent(args);
Isolate* isolate = realm->isolate();
HandleScope scope(isolate);
Local<Context> context = realm->context();

CHECK(args[0]->IsString());

Local<String> module = args[0].As<String>();
node::Utf8Value module_v(env->isolate(), module);
node::Utf8Value module_v(isolate, module);
Local<Object> exports;

node_module* mod = FindModule(modlist_internal, *module_v, NM_F_INTERNAL);
if (mod != nullptr) {
exports = InitInternalBinding(env, mod, module);
env->internal_bindings.insert(mod);
exports = InitInternalBinding(realm, mod);
realm->internal_bindings.insert(mod);
} else if (!strcmp(*module_v, "constants")) {
exports = Object::New(env->isolate());
CHECK(
exports->SetPrototype(env->context(), Null(env->isolate())).FromJust());
DefineConstants(env->isolate(), exports);
exports = Object::New(isolate);
CHECK(exports->SetPrototype(context, Null(isolate)).FromJust());
DefineConstants(isolate, exports);
} else if (!strcmp(*module_v, "natives")) {
exports = builtins::BuiltinLoader::GetSourceObject(env->context());
exports = builtins::BuiltinLoader::GetSourceObject(context);
// Legacy feature: process.binding('natives').config contains stringified
// config.gypi
CHECK(exports
->Set(env->context(),
env->config_string(),
builtins::BuiltinLoader::GetConfigString(env->isolate()))
->Set(context,
realm->isolate_data()->config_string(),
builtins::BuiltinLoader::GetConfigString(isolate))
.FromJust());
} else {
return THROW_ERR_INVALID_MODULE(env, "No such binding: %s", *module_v);
return THROW_ERR_INVALID_MODULE(isolate, "No such binding: %s", *module_v);
}

args.GetReturnValue().Set(exports);
Expand Down
15 changes: 15 additions & 0 deletions src/node_binding.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ static_assert(static_cast<int>(NM_F_LINKED) ==
static_cast<int>(node::ModuleFlags::kLinked),
"NM_F_LINKED != node::ModuleFlags::kLinked");

#define NODE_BUILTIN_PER_ISOLATE_BINDINGS(V) V(builtins)

#define NODE_BINDING_CONTEXT_AWARE_CPP(modname, regfunc, priv, flags) \
static node::node_module _module = { \
NODE_MODULE_VERSION, \
Expand All @@ -44,9 +46,20 @@ void napi_module_register_by_symbol(v8::Local<v8::Object> exports,

namespace node {

// Define a node internal binding that may be loaded in a context of
// a node::Environment.
// If a internal binding needs initializing per-isolate templates, define
// with NODE_BINDING_PER_ISOLATE_INIT too.
#define NODE_BINDING_CONTEXT_AWARE_INTERNAL(modname, regfunc) \
NODE_BINDING_CONTEXT_AWARE_CPP(modname, regfunc, nullptr, NM_F_INTERNAL)

// Define a per-isolate initialization function for a node internal binding.
#define NODE_BINDING_PER_ISOLATE_INIT(modname, per_isolate_func) \
void _register_isolate_##modname(node::IsolateData* isolate_data, \
v8::Local<v8::FunctionTemplate> target) { \
per_isolate_func(isolate_data, target); \
}

// Globals per process
// This is set by node::Init() which is used by embedders
extern bool node_is_initialized;
Expand Down Expand Up @@ -87,6 +100,8 @@ class DLib {
// use the __attribute__((constructor)). Need to
// explicitly call the _register* functions.
void RegisterBuiltinBindings();
// Create per-isolate templates for the internal bindings.
void CreateInternalBindingTemplates(IsolateData* isolate_data);
void GetInternalBinding(const v8::FunctionCallbackInfo<v8::Value>& args);
void GetLinkedBinding(const v8::FunctionCallbackInfo<v8::Value>& args);
void DLOpen(const v8::FunctionCallbackInfo<v8::Value>& args);
Expand Down
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