Install the 'name' property in classes at runtime

src/compiler/ast-graph-builder.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/compiler/ast-graph-builder.h"
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
@@ skipping 1641 matching lines @@
         NewNode(op, receiver, key, value, attr);
         break;
       }
       case ClassLiteral::Property::FIELD: {
         UNREACHABLE();
         break;
       }
     }
   }
 
+  // ES6 section 14.5.16 class expression evaluation, step 5
+  DCHECK(!expr->constructor()->name().is_null());
+  // abort if 'name' is undefined
+  if (expr->constructor()->name()->length() != 0) {
+    // if "name" is already defined, exit
+    environment()->Push(environment()->Peek(1));  // literal
+    Node* receiver = environment()->Pop();
+    Node* key = jsgraph()->Constant(isolate()->factory()->name_string());
+    IfBuilder has_name(this);
+    const Operator* has_name_op =
+        javascript()->CallRuntime(Runtime::kObjectHasOwnProperty);
+    Node* has_name_call = NewNode(has_name_op, receiver, key);
+    PrepareFrameState(has_name_call, BailoutId::None());
+    has_name.If(has_name_call, BranchHint::kFalse);
+    has_name.Then();
+    has_name.Else();
+    {
+      // define "name" property
+      environment()->Push(environment()->Peek(1));  // literal
+      Node* receiver = environment()->Pop();
+      Node* key = jsgraph()->Constant(isolate()->factory()->name_string());
+      Node* value = jsgraph()->Constant(expr->constructor()->name());
+      Node* attr = jsgraph()->Constant(DONT_ENUM | READ_ONLY);
+      Node* set_function_name = jsgraph()->Constant(0);
+      const Operator* define_name_op =
+          javascript()->CallRuntime(Runtime::kDefineDataPropertyInLiteral);
+      Node* define_name_call = NewNode(define_name_op, receiver, key, value,
+                                       attr, set_function_name);
+      PrepareFrameState(define_name_call, BailoutId::None());
+    }
+    has_name.End();
+  }
+
   // Set the constructor to have fast properties.
   prototype = environment()->Pop();
   literal = environment()->Pop();
   const Operator* op = javascript()->CallRuntime(Runtime::kToFastProperties);
   literal = NewNode(op, literal);
 
   // Assign to class variable.
   if (expr->class_variable_proxy() != nullptr) {
     Variable* var = expr->class_variable_proxy()->var();
     VectorSlotPair feedback = CreateVectorSlotPair(
@@ skipping 2652 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8