[TypeFeedbackVector] Root literal arrays in function literals slots

src/ast/ast.h

Index: src/ast/ast.h
diff --git a/src/ast/ast.h b/src/ast/ast.h
index 0a4e7481810b541c263d7965fa788375383dded2..04a74117871f0c054aad4b5d0c31a3b59e5235f7 100644
--- a/src/ast/ast.h
+++ b/src/ast/ast.h
@@ -2576,6 +2576,18 @@ class FunctionLiteral final : public Expression {
   }
   LanguageMode language_mode() const;
 
+  void AssignFeedbackVectorSlots(Isolate* isolate, FeedbackVectorSpec* spec,
+                                 FeedbackVectorSlotCache* cache) {
+    // The + 1 is because we need an array with room for the literals
+    // as well as the feedback vector.
+    literal_feedback_slot_ =
+        spec->AddCreateClosureSlot(materialized_literal_count_ + 1);
+  }
+
+  FeedbackVectorSlot LiteralFeedbackSlot() const {
+    return literal_feedback_slot_;
+  }
+
   static bool NeedsHomeObject(Expression* expr);
 
   int materialized_literal_count() { return materialized_literal_count_; }
@@ -2743,6 +2755,7 @@ class FunctionLiteral final : public Expression {
   Handle<String> inferred_name_;
   AstProperties ast_properties_;
   int function_literal_id_;
+  FeedbackVectorSlot literal_feedback_slot_;
 };
 
 // Property is used for passing information
@@ -2833,6 +2846,19 @@ class NativeFunctionLiteral final : public Expression {
  public:
   Handle<String> name() const { return name_->string(); }
   v8::Extension* extension() const { return extension_; }
+  FeedbackVectorSlot LiteralFeedbackSlot() const {
+    return literal_feedback_slot_;
+  }
+
+  void AssignFeedbackVectorSlots(Isolate* isolate, FeedbackVectorSpec* spec,
+                                 FeedbackVectorSlotCache* cache) {
+    // 0 is a magic number here. It means we are holding the literals
+    // array for a native function literal, which needs to be
+    // the empty literals array.
+    // TODO(mvstanton): The FeedbackVectorSlotCache can be adapted
+    // to always return the same slot for this case.
+    literal_feedback_slot_ = spec->AddCreateClosureSlot(0);
+  }
 
  private:
   friend class AstNodeFactory;
@@ -2845,6 +2871,7 @@ class NativeFunctionLiteral final : public Expression {
 
   const AstRawString* name_;
   v8::Extension* extension_;
+  FeedbackVectorSlot literal_feedback_slot_;
 };