Split window support from V8. ...

src/top.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 48 matching lines @@
   ThreadLocalTop* thread = reinterpret_cast<ThreadLocalTop*>(thread_storage);
   Iterate(v, thread);
   return thread_storage + sizeof(ThreadLocalTop);
 }
 
 
 #define VISIT(field) v->VisitPointer(reinterpret_cast<Object**>(&(field)));
 
 void Top::Iterate(ObjectVisitor* v, ThreadLocalTop* thread) {
   v->VisitPointer(&(thread->pending_exception_));
-  v->VisitPointer(bit_cast<Object**, Context**>(&(thread->security_context_)));
   v->VisitPointer(bit_cast<Object**, Context**>(&(thread->context_)));
   v->VisitPointer(&(thread->scheduled_exception_));
 
   for (v8::TryCatch* block = thread->try_catch_handler_;
        block != NULL;
        block = block->next_) {
     v->VisitPointer(bit_cast<Object**, void**>(&(block->exception_)));
     v->VisitPointer(bit_cast<Object**, void**>(&(block->message_)));
   }
 
   // Iterate over pointers on native execution stack.
   for (StackFrameIterator it(thread); !it.done(); it.Advance()) {
     it.frame()->Iterate(v);
   }
 }
 #undef VISIT
 
 
 void Top::Iterate(ObjectVisitor* v) {
   ThreadLocalTop* current_t = &thread_local_;
   Iterate(v, current_t);
 }
 
 
 void Top::InitializeThreadLocal() {
   thread_local_.c_entry_fp_ = 0;
   thread_local_.handler_ = 0;
   thread_local_.stack_is_cooked_ = false;
   thread_local_.try_catch_handler_ = NULL;
-  thread_local_.security_context_ = NULL;
   thread_local_.context_ = NULL;
   thread_local_.external_caught_exception_ = false;
   thread_local_.failed_access_check_callback_ = NULL;
   clear_pending_exception();
   clear_scheduled_exception();
   thread_local_.save_context_ = NULL;
 }
 
 
 // Create a dummy thread that will wait forever on a semaphore. The only
@@ skipping 327 matching lines @@
 void Top::SetFailedAccessCheckCallback(v8::FailedAccessCheckCallback callback) {
   ASSERT(thread_local_.failed_access_check_callback_ == NULL);
   thread_local_.failed_access_check_callback_ = callback;
 }
 
 
 void Top::ReportFailedAccessCheck(JSObject* receiver, v8::AccessType type) {
   if (!thread_local_.failed_access_check_callback_) return;
 
   ASSERT(receiver->IsAccessCheckNeeded());
-  ASSERT(Top::security_context());
+  ASSERT(Top::context());
   // The callers of this method are not expecting a GC.
   AssertNoAllocation no_gc;
 
   // Get the data object from access check info.
   JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
   Object* info = constructor->shared()->function_data();
   if (info == Heap::undefined_value()) return;
 
   Object* data_obj = FunctionTemplateInfo::cast(info)->access_check_info();
   if (data_obj == Heap::undefined_value()) return;
 
   HandleScope scope;
   Handle<JSObject> receiver_handle(receiver);
   Handle<Object> data(AccessCheckInfo::cast(data_obj)->data());
   thread_local_.failed_access_check_callback_(
     v8::Utils::ToLocal(receiver_handle),
     type,
     v8::Utils::ToLocal(data));
 }
 
+
+enum MayAccessDecision{
+  YES, NO, UNKNOWN
+};
+
+
+static MayAccessDecision MayAccessPreCheck(JSObject* receiver,
+                                           v8::AccessType type) {
+  // During bootstrapping, callback functions are not enabled yet.
+  if (Bootstrapper::IsActive()) return YES;
+
+  if (receiver->IsJSGlobalProxy()) {
+    Object* receiver_context = JSGlobalProxy::cast(receiver)->context();
+    if (!receiver_context->IsContext()) return NO;
+
+    // Get the global context of current top context.
+    // avoid using Top::global_context() because it uses Handle.
+    Context* global_context = Top::context()->global()->global_context();
+    if (receiver_context == global_context) return YES; 
+
+    if (Context::cast(receiver_context)->security_token() ==
+        global_context->security_token())
+      return YES;
+  }
+
+  return UNKNOWN;
+}
+
+
 bool Top::MayNamedAccess(JSObject* receiver, Object* key, v8::AccessType type) {
   ASSERT(receiver->IsAccessCheckNeeded());
   // Check for compatibility between the security tokens in the
-  // current security context and the accessed object.
-  ASSERT(Top::security_context());
+  // current lexical context and the accessed object.
+  ASSERT(Top::context());
   // The callers of this method are not expecting a GC.
   AssertNoAllocation no_gc;
 
-  // During bootstrapping, callback functions are not enabled yet.
-  if (Bootstrapper::IsActive()) return true;
-
-  if (receiver->IsJSGlobalObject()) {
-    JSGlobalObject* global = JSGlobalObject::cast(receiver);
-    JSGlobalObject* current =
-        JSGlobalObject::cast(Top::security_context()->global());
-    if (current->security_token() == global->security_token()) return true;
-  }
+  MayAccessDecision decision = MayAccessPreCheck(receiver, type);
+  if (decision != UNKNOWN) return decision == YES;
 
   // Get named access check callback
   JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
   Object* info = constructor->shared()->function_data();
   if (info == Heap::undefined_value()) return false;
 
   Object* data_obj = FunctionTemplateInfo::cast(info)->access_check_info();
   if (data_obj == Heap::undefined_value()) return false;
 
   Object* fun_obj = AccessCheckInfo::cast(data_obj)->named_callback();
@@ skipping 18 matching lines @@
   }
   return result;
 }
 
 
 bool Top::MayIndexedAccess(JSObject* receiver,
                            uint32_t index,
                            v8::AccessType type) {
   ASSERT(receiver->IsAccessCheckNeeded());
   // Check for compatibility between the security tokens in the
-  // current security context and the accessed object.
-  ASSERT(Top::security_context());
+  // current lexical context and the accessed object.
+  ASSERT(Top::context());
   // The callers of this method are not expecting a GC.
   AssertNoAllocation no_gc;
 
-  // During bootstrapping, callback functions are not enabled yet.
-  if (Bootstrapper::IsActive()) return true;
-
-  if (receiver->IsJSGlobalObject()) {
-    JSGlobalObject* global = JSGlobalObject::cast(receiver);
-    JSGlobalObject* current =
-      JSGlobalObject::cast(Top::security_context()->global());
-    if (current->security_token() == global->security_token()) return true;
-  }
+  MayAccessDecision decision = MayAccessPreCheck(receiver, type);
+  if (decision != UNKNOWN) return decision == YES;
 
   // Get indexed access check callback
   JSFunction* constructor = JSFunction::cast(receiver->map()->constructor());
   Object* info = constructor->shared()->function_data();
   if (info == Heap::undefined_value()) return false;
 
   Object* data_obj = FunctionTemplateInfo::cast(info)->access_check_info();
   if (data_obj == Heap::undefined_value()) return false;
 
   Object* fun_obj = AccessCheckInfo::cast(data_obj)->indexed_callback();
@@ skipping 16 matching lines @@
                       v8::Utils::ToLocal(data));
   }
   return result;
 }
 
 
 Failure* Top::StackOverflow() {
   HandleScope scope;
   Handle<String> key = Factory::stack_overflow_symbol();
   Handle<JSObject> boilerplate =
-      Handle<JSObject>::cast(
-          GetProperty(Top::security_context_builtins(), key));
+      Handle<JSObject>::cast(GetProperty(Top::builtins(), key));
   Handle<Object> exception = Copy(boilerplate);
   // TODO(1240995): To avoid having to call JavaScript code to compute
   // the message for stack overflow exceptions which is very likely to
   // double fault with another stack overflow exception, we use a
   // precomputed message. This is somewhat problematic in that it
   // doesn't use ReportUncaughtException to determine the location
   // from where the exception occurred. It should probably be
   // reworked.
   static const char* kMessage =
       "Uncaught RangeError: Maximum call stack size exceeded";
@@ skipping 297 matching lines @@
   Top::break_access_->Lock();
 }
 
 
 ExecutionAccess::~ExecutionAccess() {
   Top::break_access_->Unlock();
 }
 
 
 } }  // namespace v8::internal