Vector ICs: Introduce an InstanceType for the type feedback vector.

src/runtime/runtime-array.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/v8.h"
 
 #include "src/arguments.h"
 #include "src/elements.h"
 #include "src/messages.h"
 #include "src/runtime/runtime-utils.h"
@@ skipping 40 matching lines @@
   InstallBuiltin(isolate, holder, "splice", Builtins::kArraySplice);
   InstallBuiltin(isolate, holder, "concat", Builtins::kArrayConcat);
 
   return *holder;
 }
 
 
 RUNTIME_FUNCTION(Runtime_FixedArrayGet) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
-  CONVERT_ARG_CHECKED(FixedArray, object, 0);
+  CONVERT_ARG_CHECKED(FixedArrayBase, object, 0);
   CONVERT_SMI_ARG_CHECKED(index, 1);
-  return object->get(index);
+  if (object->IsTypeFeedbackVector()) {
+    return TypeFeedbackVector::cast(object)->get(index);

[Hannes Payer (out of office), 2015/07/01 09:44:36]

The type feedback vector should actually have to separate assessors to avoid the
ugly conditionals.

+  }
+  return FixedArray::cast(object)->get(index);
 }
 
 
 RUNTIME_FUNCTION(Runtime_FixedArraySet) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 3);
-  CONVERT_ARG_CHECKED(FixedArray, object, 0);
+  CONVERT_ARG_CHECKED(FixedArrayBase, object, 0);
   CONVERT_SMI_ARG_CHECKED(index, 1);
   CONVERT_ARG_CHECKED(Object, value, 2);
-  object->set(index, value);
+  if (object->IsTypeFeedbackVector()) {
+    TypeFeedbackVector::cast(object)->set(index, value);
+  } else {
+    FixedArray::cast(object)->set(index, value);
+  }
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_TransitionElementsKind) {
   HandleScope scope(isolate);
   RUNTIME_ASSERT(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSArray, array, 0);
   CONVERT_ARG_HANDLE_CHECKED(Map, map, 1);
   JSObject::TransitionElementsKind(array, map->elements_kind());
@@ skipping 1233 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_FastOneByteArrayJoin) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 2);
   // Returning undefined means that this fast path fails and one has to resort
   // to a slow path.
   return isolate->heap()->undefined_value();
 }
 }  // namespace internal
 }  // namespace v8