[ignition] Eliminate hole checks where statically possible for loads and stores

src/ast/ast.h

 // Copyright 2012 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.
 
 #ifndef V8_AST_AST_H_
 #define V8_AST_AST_H_
 
 #include "src/ast/ast-types.h"
 #include "src/ast/ast-value-factory.h"
 #include "src/ast/modules.h"
@@ skipping 1653 matching lines @@
   bool is_resolved() const { return IsResolvedField::decode(bit_field_); }
   void set_is_resolved() {
     bit_field_ = IsResolvedField::update(bit_field_, true);
   }
 
   bool is_new_target() const { return IsNewTargetField::decode(bit_field_); }
   void set_is_new_target() {
     bit_field_ = IsNewTargetField::update(bit_field_, true);
   }
 
+  bool needs_hole_check() const {
+    return NeedsHoleCheckField::decode(bit_field_);
+  }
+  void set_needs_hole_check() {
+    bit_field_ = NeedsHoleCheckField::update(bit_field_, true);
+  }
+
   int end_position() const { return end_position_; }
 
   // Bind this proxy to the variable var.
   void BindTo(Variable* var);
 
   bool UsesVariableFeedbackSlot() const {
     return var()->IsUnallocated() || var()->IsLookupSlot();
   }
 
   void AssignFeedbackVectorSlots(Isolate* isolate, FeedbackVectorSpec* spec,
@@ skipping 15 matching lines @@
   explicit VariableProxy(const VariableProxy* copy_from);
 
   static int parent_num_ids() { return Expression::num_ids(); }
   int local_id(int n) const { return base_id() + parent_num_ids() + n; }
 
   class IsThisField : public BitField<bool, Expression::kNextBitFieldIndex, 1> {
   };
   class IsAssignedField : public BitField<bool, IsThisField::kNext, 1> {};
   class IsResolvedField : public BitField<bool, IsAssignedField::kNext, 1> {};
   class IsNewTargetField : public BitField<bool, IsResolvedField::kNext, 1> {};
+  class NeedsHoleCheckField
+      : public BitField<bool, IsNewTargetField::kNext, 1> {};
 
   // Position is stored in the AstNode superclass, but VariableProxy needs to
   // know its end position too (for error messages). It cannot be inferred from
   // the variable name length because it can contain escapes.
   int end_position_;
   FeedbackVectorSlot variable_feedback_slot_;
   union {
     const AstRawString* raw_name_;  // if !is_resolved_
     Variable* var_;                 // if is_resolved_
   };
@@ skipping 1874 matching lines @@
                                     : NULL;                                   \
   }
 AST_NODE_LIST(DECLARE_NODE_FUNCTIONS)
 #undef DECLARE_NODE_FUNCTIONS
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_AST_H_