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Revert recent contextify changes #5782

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Revert recent contextify changes #5782

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f74a61c
Revert "contextify: cache sandbox and context in locals"
cjihrig Mar 18, 2016
a1a080a
Revert "contextify: replace deprecated SetWeak usage"
cjihrig Mar 18, 2016
7bb5216
Revert "contextify: cleanup weak ref for sandbox"
cjihrig Mar 18, 2016
61d2bae
Revert "contextify: cleanup weak ref for global proxy"
cjihrig Mar 18, 2016
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112 changes: 73 additions & 39 deletions src/node_contextify.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -45,33 +45,53 @@ using v8::Uint8Array;
using v8::UnboundScript;
using v8::V8;
using v8::Value;
using v8::WeakCallbackInfo;
using v8::WeakCallbackData;


class ContextifyContext {
protected:
// V8 reserves the first field in context objects for the debugger. We use the
// second field to hold a reference to the sandbox object.
enum { kSandboxObjectIndex = 1 };
enum Kind {
kSandbox,
kContext,
kProxyGlobal
};

Environment* const env_;
Persistent<Object> sandbox_;
Persistent<Context> context_;
Persistent<Object> proxy_global_;
int references_;

public:
ContextifyContext(Environment* env, Local<Object> sandbox_obj) : env_(env) {
Local<Context> v8_context = CreateV8Context(env, sandbox_obj);
context_.Reset(env->isolate(), v8_context);
explicit ContextifyContext(Environment* env, Local<Object> sandbox)
: env_(env),
sandbox_(env->isolate(), sandbox),
// Wait for sandbox_, proxy_global_, and context_ to die
references_(0) {
context_.Reset(env->isolate(), CreateV8Context(env));

sandbox_.SetWeak(this, WeakCallback<Object, kSandbox>);
sandbox_.MarkIndependent();
references_++;

// Allocation failure or maximum call stack size reached
if (context_.IsEmpty())
return;
context_.SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);
context_.SetWeak(this, WeakCallback<Context, kContext>);
context_.MarkIndependent();
references_++;

proxy_global_.Reset(env->isolate(), context()->Global());
proxy_global_.SetWeak(this, WeakCallback<Object, kProxyGlobal>);
proxy_global_.MarkIndependent();
references_++;
}


~ContextifyContext() {
context_.Reset();
proxy_global_.Reset();
sandbox_.Reset();
}


Expand All @@ -85,15 +105,6 @@ class ContextifyContext {
}


inline Local<Object> global_proxy() const {
return context()->Global();
}


inline Local<Object> sandbox() const {
return Local<Object>::Cast(context()->GetEmbedderData(kSandboxObjectIndex));
}

// XXX(isaacs): This function only exists because of a shortcoming of
// the V8 SetNamedPropertyHandler function.
//
Expand Down Expand Up @@ -121,15 +132,15 @@ class ContextifyContext {
Local<Context> context = PersistentToLocal(env()->isolate(), context_);
Local<Object> global =
context->Global()->GetPrototype()->ToObject(env()->isolate());
Local<Object> sandbox_obj = sandbox();
Local<Object> sandbox = PersistentToLocal(env()->isolate(), sandbox_);

Local<Function> clone_property_method;

Local<Array> names = global->GetOwnPropertyNames();
int length = names->Length();
for (int i = 0; i < length; i++) {
Local<String> key = names->Get(i)->ToString(env()->isolate());
bool has = sandbox_obj->HasOwnProperty(context, key).FromJust();
bool has = sandbox->HasOwnProperty(context, key).FromJust();
if (!has) {
// Could also do this like so:
//
Expand Down Expand Up @@ -161,7 +172,7 @@ class ContextifyContext {
clone_property_method = Local<Function>::Cast(script->Run());
CHECK(clone_property_method->IsFunction());
}
Local<Value> args[] = { global, key, sandbox_obj };
Local<Value> args[] = { global, key, sandbox };
clone_property_method->Call(global, ARRAY_SIZE(args), args);
}
}
Expand All @@ -186,13 +197,14 @@ class ContextifyContext {
}


Local<Context> CreateV8Context(Environment* env, Local<Object> sandbox_obj) {
Local<Context> CreateV8Context(Environment* env) {
EscapableHandleScope scope(env->isolate());
Local<FunctionTemplate> function_template =
FunctionTemplate::New(env->isolate());
function_template->SetHiddenPrototype(true);

function_template->SetClassName(sandbox_obj->GetConstructorName());
Local<Object> sandbox = PersistentToLocal(env->isolate(), sandbox_);
function_template->SetClassName(sandbox->GetConstructorName());

Local<ObjectTemplate> object_template =
function_template->InstanceTemplate();
Expand All @@ -209,7 +221,6 @@ class ContextifyContext {

CHECK(!ctx.IsEmpty());
ctx->SetSecurityToken(env->context()->GetSecurityToken());
ctx->SetEmbedderData(kSandboxObjectIndex, sandbox_obj);

env->AssignToContext(ctx);

Expand Down Expand Up @@ -305,9 +316,18 @@ class ContextifyContext {
}


static void WeakCallback(const WeakCallbackInfo<ContextifyContext>& data) {
template <class T, Kind kind>
static void WeakCallback(const WeakCallbackData<T, ContextifyContext>& data) {
ContextifyContext* context = data.GetParameter();
delete context;
if (kind == kSandbox)
context->sandbox_.ClearWeak();
else if (kind == kContext)
context->context_.ClearWeak();
else
context->proxy_global_.ClearWeak();

if (--context->references_ == 0)
delete context;
}


Expand All @@ -329,26 +349,28 @@ class ContextifyContext {
static void GlobalPropertyGetterCallback(
Local<Name> property,
const PropertyCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();

ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());

// Stil initializing
if (ctx->context_.IsEmpty())
return;

Local<Context> context = ctx->context();
Local<Object> sandbox = ctx->sandbox();
Local<Object> sandbox = PersistentToLocal(isolate, ctx->sandbox_);
MaybeLocal<Value> maybe_rv =
sandbox->GetRealNamedProperty(context, property);
sandbox->GetRealNamedProperty(ctx->context(), property);
if (maybe_rv.IsEmpty()) {
maybe_rv =
ctx->global_proxy()->GetRealNamedProperty(context, property);
Local<Object> proxy_global = PersistentToLocal(isolate,
ctx->proxy_global_);
maybe_rv = proxy_global->GetRealNamedProperty(ctx->context(), property);
}

Local<Value> rv;
if (maybe_rv.ToLocal(&rv)) {
if (rv == sandbox)
rv = ctx->global_proxy();
if (rv == ctx->sandbox_)
rv = PersistentToLocal(isolate, ctx->proxy_global_);

args.GetReturnValue().Set(rv);
}
Expand All @@ -359,35 +381,42 @@ class ContextifyContext {
Local<Name> property,
Local<Value> value,
const PropertyCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();

ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());

// Stil initializing
if (ctx->context_.IsEmpty())
return;

ctx->sandbox()->Set(property, value);
PersistentToLocal(isolate, ctx->sandbox_)->Set(property, value);
}


static void GlobalPropertyQueryCallback(
Local<Name> property,
const PropertyCallbackInfo<Integer>& args) {
Isolate* isolate = args.GetIsolate();

ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());

// Stil initializing
if (ctx->context_.IsEmpty())
return;

Local<Context> context = ctx->context();
Local<Object> sandbox = PersistentToLocal(isolate, ctx->sandbox_);
Maybe<PropertyAttribute> maybe_prop_attr =
ctx->sandbox()->GetRealNamedPropertyAttributes(context, property);
sandbox->GetRealNamedPropertyAttributes(ctx->context(), property);

if (maybe_prop_attr.IsNothing()) {
Local<Object> proxy_global = PersistentToLocal(isolate,
ctx->proxy_global_);

maybe_prop_attr =
ctx->global_proxy()->GetRealNamedPropertyAttributes(context,
property);
proxy_global->GetRealNamedPropertyAttributes(ctx->context(),
property);
}

if (maybe_prop_attr.IsJust()) {
Expand All @@ -400,14 +429,18 @@ class ContextifyContext {
static void GlobalPropertyDeleterCallback(
Local<Name> property,
const PropertyCallbackInfo<Boolean>& args) {
Isolate* isolate = args.GetIsolate();

ContextifyContext* ctx =
Unwrap<ContextifyContext>(args.Data().As<Object>());

// Stil initializing
if (ctx->context_.IsEmpty())
return;

Maybe<bool> success = ctx->sandbox()->Delete(ctx->context(), property);
Local<Object> sandbox = PersistentToLocal(isolate, ctx->sandbox_);

Maybe<bool> success = sandbox->Delete(ctx->context(), property);

if (success.IsJust())
args.GetReturnValue().Set(success.FromJust());
Expand All @@ -423,7 +456,8 @@ class ContextifyContext {
if (ctx->context_.IsEmpty())
return;

args.GetReturnValue().Set(ctx->sandbox()->GetPropertyNames());
Local<Object> sandbox = PersistentToLocal(args.GetIsolate(), ctx->sandbox_);
args.GetReturnValue().Set(sandbox->GetPropertyNames());
}
};

Expand Down