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#include "node_shadow_realm.h"
#include "env-inl.h"
#include "node_errors.h"
#include "node_process.h"
namespace node {
namespace shadow_realm {
using v8::Context;
using v8::EscapableHandleScope;
using v8::HandleScope;
using v8::Local;
using v8::MaybeLocal;
using v8::Object;
using v8::String;
using v8::Value;
using TryCatchScope = node::errors::TryCatchScope;
// static
ShadowRealm* ShadowRealm::New(Environment* env) {
ShadowRealm* realm = new ShadowRealm(env);
// TODO(legendecas): required by node::PromiseRejectCallback.
// Remove this once promise rejection doesn't need to be handled across
// realms.
realm->context()->SetSecurityToken(
env->principal_realm()->context()->GetSecurityToken());
// We do not expect the realm bootstrapping to throw any
// exceptions. If it does, exit the current Node.js instance.
TryCatchScope try_catch(env, TryCatchScope::CatchMode::kFatal);
if (realm->RunBootstrapping().IsEmpty()) {
delete realm;
return nullptr;
}
return realm;
}
// static
MaybeLocal<Context> HostCreateShadowRealmContextCallback(
Local<Context> initiator_context) {
Environment* env = Environment::GetCurrent(initiator_context);
EscapableHandleScope scope(env->isolate());
// We do not expect the realm bootstrapping to throw any
// exceptions. If it does, exit the current Node.js instance.
TryCatchScope try_catch(env, TryCatchScope::CatchMode::kFatal);
ShadowRealm* realm = ShadowRealm::New(env);
if (realm != nullptr) {
return scope.Escape(realm->context());
}
return MaybeLocal<Context>();
}
// static
void ShadowRealm::WeakCallback(const v8::WeakCallbackInfo<ShadowRealm>& data) {
ShadowRealm* realm = data.GetParameter();
realm->context_.Reset();
// Yield to pending weak callbacks before deleting the realm.
// This is necessary to avoid cleaning up base objects before their scheduled
// weak callbacks are invoked, which can lead to accessing to v8 apis during
// the first pass of the weak callback.
realm->env()->SetImmediate([realm](Environment* env) { delete realm; });
// Remove the cleanup hook to avoid deleting the realm again.
realm->env()->RemoveCleanupHook(DeleteMe, realm);
}
// static
void ShadowRealm::DeleteMe(void* data) {
ShadowRealm* realm = static_cast<ShadowRealm*>(data);
// Clear the context handle to avoid invoking the weak callback again.
// Also, the context internal slots are cleared and the context is no longer
// reference to the realm.
delete realm;
}
ShadowRealm::ShadowRealm(Environment* env)
: Realm(env, NewContext(env->isolate()), kShadowRealm) {
context_.SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);
CreateProperties();
env->TrackShadowRealm(this);
env->AddCleanupHook(DeleteMe, this);
}
ShadowRealm::~ShadowRealm() {
while (HasCleanupHooks()) {
RunCleanup();
}
env_->UntrackShadowRealm(this);
if (context_.IsEmpty()) {
// This most likely happened because the weak callback cleared it.
return;
}
{
HandleScope handle_scope(isolate());
env_->UnassignFromContext(context());
}
}
v8::Local<v8::Context> ShadowRealm::context() const {
Local<Context> ctx = PersistentToLocal::Default(isolate_, context_);
DCHECK(!ctx.IsEmpty());
return ctx;
}
// V8 can not infer reference cycles between global persistent handles, e.g.
// the Realm's Context handle and the per-realm function handles.
// Attach the per-realm strong persistent values' lifetime to the context's
// global object to avoid the strong global references to the per-realm objects
// keep the context alive indefinitely.
#define V(PropertyName, TypeName) \
v8::Local<TypeName> ShadowRealm::PropertyName() const { \
return PersistentToLocal::Default(isolate_, PropertyName##_); \
} \
void ShadowRealm::set_##PropertyName(v8::Local<TypeName> value) { \
HandleScope scope(isolate_); \
PropertyName##_.Reset(isolate_, value); \
v8::Local<v8::Context> ctx = context(); \
if (value.IsEmpty()) { \
ctx->Global() \
->SetPrivate(ctx, \
isolate_data()->per_realm_##PropertyName(), \
v8::Undefined(isolate_)) \
.ToChecked(); \
} else { \
PropertyName##_.SetWeak(); \
ctx->Global() \
->SetPrivate(ctx, isolate_data()->per_realm_##PropertyName(), value) \
.ToChecked(); \
} \
}
PER_REALM_STRONG_PERSISTENT_VALUES(V)
#undef V
v8::MaybeLocal<v8::Value> ShadowRealm::BootstrapRealm() {
HandleScope scope(isolate_);
// Skip "internal/bootstrap/node" as it installs node globals and per-isolate
// callbacks.
if (!env_->no_browser_globals()) {
if (ExecuteBootstrapper("internal/bootstrap/web/exposed-wildcard")
.IsEmpty()) {
return MaybeLocal<Value>();
}
}
// The process object is not exposed globally in ShadowRealm yet.
// However, the process properties need to be setup for built-in modules.
// Specifically, process.cwd() is needed by the ESM loader.
if (ExecuteBootstrapper(
"internal/bootstrap/switches/does_not_own_process_state")
.IsEmpty()) {
return MaybeLocal<Value>();
}
// Setup process.env proxy.
Local<String> env_string = FIXED_ONE_BYTE_STRING(isolate_, "env");
Local<Object> env_proxy;
if (!isolate_data()->env_proxy_template()->NewInstance(context()).ToLocal(
&env_proxy) ||
process_object()->Set(context(), env_string, env_proxy).IsNothing()) {
return MaybeLocal<Value>();
}
if (ExecuteBootstrapper("internal/bootstrap/shadow_realm").IsEmpty()) {
return MaybeLocal<Value>();
}
return v8::True(isolate_);
}
} // namespace shadow_realm
} // namespace node
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