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 1596 matching lines @@
 
   // Load the "prototype" from the constructor.
   PrepareEagerCheckpoint(expr->CreateLiteralId());
   Handle<Name> name = isolate()->factory()->prototype_string();
   VectorSlotPair pair = CreateVectorSlotPair(expr->PrototypeSlot());
   Node* prototype = BuildNamedLoad(literal, name, pair);
   PrepareFrameState(prototype, expr->PrototypeId(),
                     OutputFrameStateCombine::Push());
   environment()->Push(prototype);
 
+  Node* needs_name;
+  bool check_name = !expr->has_name_static_property() &&
+                    !expr->constructor()->raw_name()->IsEmpty();
+  if (check_name) {
+    needs_name = jsgraph()->TrueConstant();
+  }
+
   // Create nodes to store method values into the literal.
   for (int i = 0; i < expr->properties()->length(); i++) {
     ClassLiteral::Property* property = expr->properties()->at(i);
     environment()->Push(environment()->Peek(property->is_static() ? 1 : 0));
 
     VisitForValue(property->key());
     Node* name = BuildToName(environment()->Pop(), expr->GetIdForProperty(i));
     environment()->Push(name);
 
-    // The static prototype property is read only. We handle the non computed
-    // property name case in the parser. Since this is the only case where we
-    // need to check for an own read only property we special case this so we do
-    // not need to do this for every property.
     if (property->is_static() && property->is_computed_name()) {
+      // Check for a static property called "name". The non computed property
+      // name is handled in the parser.
+      if (check_name) {
+        IfBuilder needs_name_is_false(this);
+        Node* needs_name_is_false_cond =
+            NewNode(javascript()->StrictEqual(CompareOperationHint::kAny),
+                    needs_name, jsgraph()->FalseConstant());
+        needs_name_is_false.If(needs_name_is_false_cond, BranchHint::kFalse);
+        needs_name_is_false.Then();
+        needs_name_is_false.Else();
+        {
+          IfBuilder has_name(this);
+          Node* name_string =
+              jsgraph()->Constant(isolate()->factory()->name_string());
+          Node* has_name_cond =
+              NewNode(javascript()->StrictEqual(CompareOperationHint::kAny),
+                      name, name_string);
+          has_name.If(has_name_cond, BranchHint::kFalse);
+          has_name.Then();
+          needs_name = jsgraph()->FalseConstant();
+          has_name.Else();
+          has_name.End();
+        }
+        needs_name_is_false.End();
+      }
+
+      // The static prototype property is read only. We handle the non computed
+      // property name case in the parser. Since this is the only case where we
+      // need to check for an own read only property we special case this so we
+      // do
+      // not need to do this for every property.
       Node* check = BuildThrowIfStaticPrototype(environment()->Pop(),
                                                 expr->GetIdForProperty(i));
       environment()->Push(check);
     }
 
     VisitForValue(property->value());
     Node* value = environment()->Pop();
     Node* key = environment()->Pop();
     Node* receiver = environment()->Pop();
 
@@ skipping 24 matching lines @@
         NewNode(op, receiver, key, value, attr);
         break;
       }
       case ClassLiteral::Property::FIELD: {
         UNREACHABLE();
         break;
       }
     }
   }
 
+  prototype = environment()->Pop();
+
+  // Install a "name" property if missing.
+  if (check_name) {
+    IfBuilder install_name(this);
+    Node* install_name_cond =
+        NewNode(javascript()->StrictEqual(CompareOperationHint::kAny),
+                needs_name, jsgraph()->TrueConstant());
+    install_name.If(install_name_cond, BranchHint::kTrue);
+    install_name.Then();
+    {
+      literal = environment()->Pop();
+      const Operator* op =
+          javascript()->CallRuntime(Runtime::kInstallClassNameAccessor);
+      literal = NewNode(op, literal);
+      PrepareFrameState(literal, BailoutId::None());
+      environment()->Push(literal);
+    }
+    install_name.Else();
+    install_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(
         expr->NeedsProxySlot() ? expr->ProxySlot()
                                : FeedbackVectorSlot::Invalid());
@@ skipping 2668 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