WIP: type profiling.

src/runtime/runtime-object.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
@@ skipping 662 matching lines @@
   LookupIterator it = LookupIterator::PropertyOrElement(
       isolate, object, name, object, LookupIterator::OWN);
   // Cannot fail since this should only be called when
   // creating an object literal.
   CHECK(JSObject::DefineOwnPropertyIgnoreAttributes(&it, value, attrs,
                                                     Object::DONT_THROW)
             .IsJust());
   return *object;
 }
 
+RUNTIME_FUNCTION(Runtime_StoreTypeInformation) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(4, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Name, name, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
+  CONVERT_ARG_HANDLE_CHECKED(FeedbackVector, vector, 2);
+  CONVERT_SMI_ARG_CHECKED(index, 3);
+
+  DCHECK(FLAG_type_profile);
+
+  StoreDataPropertyInLiteralICNexus nexus(vector, vector->ToSlot(index));
+  if (nexus.ic_state() == UNINITIALIZED) {
+    if (name->IsUniqueName()) {
+      printf(".");
+      nexus.ConfigureMonomorphic(name, handle(name->map()));
+    } else {
+      nexus.ConfigureMegamorphic();
+    }
+  } else if (nexus.ic_state() == MONOMORPHIC) {
+    printf("1");
+    if (nexus.FindFirstMap() != name->map() ||
+        nexus.GetFeedbackExtra() != *name) {
+      nexus.ConfigureMegamorphic();
+    }
+  }
+
+  // We want to print the type profile, i.e., variable name and result of
+  // value.constructor.name or typeof value.
+
+  printf("name: ");
+  name->Print();
+  printf("value: ");
+  Object::TypeOf(isolate, value)->Print();
+  printf("\n");
+
+  return *value;
+}
+
 // Return property without being observable by accessors or interceptors.
 RUNTIME_FUNCTION(Runtime_GetDataProperty) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, object, 0);
   CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
   return *JSReceiver::GetDataProperty(object, name);
 }
 
 RUNTIME_FUNCTION(Runtime_GetConstructorName) {
@@ skipping 291 matching lines @@
   if (!success) return isolate->heap()->exception();
   MAYBE_RETURN(
       JSReceiver::CreateDataProperty(&it, value, Object::THROW_ON_ERROR),
       isolate->heap()->exception());
   return *value;
 }
 
 
 }  // namespace internal
 }  // namespace v8