[TypeFeedbackVector] Root feedback vectors at function literal site.

src/runtime/runtime-scopes.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 <memory>
 
 #include "src/accessors.h"
 #include "src/arguments.h"
@@ skipping 122 matching lines @@
                        int flags, Handle<TypeFeedbackVector> feedback_vector) {
   HandleScope scope(isolate);
   Handle<JSGlobalObject> global(isolate->global_object());
   Handle<Context> context(isolate->context());
 
   // Traverse the name/value pairs and set the properties.
   int length = declarations->length();
   FOR_WITH_HANDLE_SCOPE(isolate, int, i = 0, i, i < length, i += 4, {
     Handle<String> name(String::cast(declarations->get(i)), isolate);
     FeedbackVectorSlot slot(Smi::cast(declarations->get(i + 1))->value());
+    Handle<Object> possibly_literal_slot(declarations->get(i + 2), isolate);
     Handle<Object> initial_value(declarations->get(i + 3), isolate);
 
     bool is_var = initial_value->IsUndefined(isolate);
     bool is_function = initial_value->IsSharedFunctionInfo();
     DCHECK_EQ(1, BoolToInt(is_var) + BoolToInt(is_function));
 
     Handle<Object> value;
     if (is_function) {
+      DCHECK(possibly_literal_slot->IsSmi());
       // Copy the function and update its context. Use it as value.
       Handle<SharedFunctionInfo> shared =
           Handle<SharedFunctionInfo>::cast(initial_value);
+      FeedbackVectorSlot literals_slot(
+          Smi::cast(*possibly_literal_slot)->value());
+      Handle<Cell> literals(Cell::cast(feedback_vector->Get(literals_slot)),
+                            isolate);
       Handle<JSFunction> function =
-          isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context,
-                                                                TENURED);
+          isolate->factory()->NewFunctionFromSharedFunctionInfo(
+              shared, context, literals, TENURED);
       value = function;
     } else {
       value = isolate->factory()->undefined_value();
     }
 
     // Compute the property attributes. According to ECMA-262,
     // the property must be non-configurable except in eval.
     bool is_native = DeclareGlobalsNativeFlag::decode(flags);
     bool is_eval = DeclareGlobalsEvalFlag::decode(flags);
     int attr = NONE;
@@ skipping 439 matching lines @@
   for (int index = 0; index < length; ++index) {
     result->set(index, frame[offset - index], mode);
   }
   return *result;
 }
 
 RUNTIME_FUNCTION(Runtime_NewClosure) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0);
+  CONVERT_ARG_HANDLE_CHECKED(TypeFeedbackVector, vector, 1);
+  CONVERT_SMI_ARG_CHECKED(index, 2);
   Handle<Context> context(isolate->context(), isolate);
+  FeedbackVectorSlot slot = TypeFeedbackVector::ToSlot(index);
+  Handle<Cell> literals(Cell::cast(vector->Get(slot)), isolate);
   Handle<JSFunction> function =
-      isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context,
-                                                            NOT_TENURED);
+      isolate->factory()->NewFunctionFromSharedFunctionInfo(
+          shared, context, literals, NOT_TENURED);
   return *function;
 }
 
 
 RUNTIME_FUNCTION(Runtime_NewClosure_Tenured) {
   HandleScope scope(isolate);
   DCHECK_EQ(3, args.length());
   CONVERT_ARG_HANDLE_CHECKED(SharedFunctionInfo, shared, 0);
+  CONVERT_ARG_HANDLE_CHECKED(TypeFeedbackVector, vector, 1);
+  CONVERT_SMI_ARG_CHECKED(index, 2);
   Handle<Context> context(isolate->context(), isolate);
+  FeedbackVectorSlot slot = TypeFeedbackVector::ToSlot(index);
+  Handle<Cell> literals(Cell::cast(vector->Get(slot)), isolate);
   // The caller ensures that we pretenure closures that are assigned
   // directly to properties.
   Handle<JSFunction> function =
       isolate->factory()->NewFunctionFromSharedFunctionInfo(shared, context,
-                                                            TENURED);
+                                                            literals, TENURED);
   return *function;
 }
 
 static Object* FindNameClash(Handle<ScopeInfo> scope_info,
                              Handle<JSGlobalObject> global_object,
                              Handle<ScriptContextTable> script_context) {
   Isolate* isolate = scope_info->GetIsolate();
   for (int var = 0; var < scope_info->ContextLocalCount(); var++) {
     Handle<String> name(scope_info->ContextLocalName(var));
     VariableMode mode = scope_info->ContextLocalMode(var);
@@ skipping 335 matching lines @@
 RUNTIME_FUNCTION(Runtime_StoreLookupSlot_Strict) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(String, name, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
   RETURN_RESULT_OR_FAILURE(isolate, StoreLookupSlot(name, value, STRICT));
 }
 
 }  // namespace internal
 }  // namespace v8