WIP: type profiling.

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index dd24728457d2fab4b5fdb1d284e3116849bc0276..4ad26dee0fad043988a5ec11645bf71f68f136d5 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -680,6 +680,44 @@ RUNTIME_FUNCTION(Runtime_DefineDataPropertyInLiteral) {
   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);