Move desugaring of super calls with trailing spread to one runtime call.

src/parsing/parser.cc

 // 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.
 
 #include "src/parsing/parser.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/ast/ast-expression-rewriter.h"
@@ skipping 226 matching lines @@
   function_scope->set_start_position(pos);
   function_scope->set_end_position(pos);
   ZoneList<Statement*>* body = NULL;
 
   {
     FunctionState function_state(&function_state_, &scope_state_,
                                  function_scope);
 
     body = new (zone()) ZoneList<Statement*>(call_super ? 2 : 1, zone());
     if (call_super) {
-      // $super_constructor = %_GetSuperConstructor(<this-function>)
-      // %reflect_construct(
-      //     $super_constructor, InternalArray(...args), new.target)
+      // Create a SuperCallReference and handle in BytecodeGenerator
       auto constructor_args_name = ast_value_factory()->empty_string();
       bool is_duplicate;
       bool is_rest = true;
       bool is_optional = false;
       Variable* constructor_args = function_scope->DeclareParameter(
           constructor_args_name, TEMPORARY, is_optional, is_rest, &is_duplicate,
           ast_value_factory());
 
       ZoneList<Expression*>* args =
-          new (zone()) ZoneList<Expression*>(2, zone());
-      VariableProxy* this_function_proxy =
-          NewUnresolved(ast_value_factory()->this_function_string(), pos);
-      ZoneList<Expression*>* tmp =
           new (zone()) ZoneList<Expression*>(1, zone());
-      tmp->Add(this_function_proxy, zone());
-      Expression* super_constructor = factory()->NewCallRuntime(
-          Runtime::kInlineGetSuperConstructor, tmp, pos);
-      args->Add(super_constructor, zone());
       Spread* spread_args = factory()->NewSpread(
           factory()->NewVariableProxy(constructor_args), pos, pos);
-      ZoneList<Expression*>* spread_args_expr =
-          new (zone()) ZoneList<Expression*>(1, zone());
-      spread_args_expr->Add(spread_args, zone());
-      args->AddAll(*PrepareSpreadArguments(spread_args_expr), zone());
-      VariableProxy* new_target_proxy =
-          NewUnresolved(ast_value_factory()->new_target_string(), pos);
-      args->Add(new_target_proxy, zone());
-      Expression* call = factory()->NewCallRuntime(
-          Context::REFLECT_CONSTRUCT_INDEX, args, pos);
-      if (requires_class_field_init) {
-        call = CallClassFieldInitializer(scope(), call);
-      }
+
+      args->Add(spread_args, zone());
+      Expression* super_call_ref = NewSuperCallReference(pos);
+      Expression* call = factory()->NewCall(super_call_ref, args, pos);
       body->Add(factory()->NewReturnStatement(call, pos), zone());
     }
 
     materialized_literal_count = function_state.materialized_literal_count();
     expected_property_count = function_state.expected_property_count();
   }
 
   FunctionLiteral* function_literal = factory()->NewFunctionLiteral(
       name, function_scope, body, materialized_literal_count,
       expected_property_count, parameter_count, parameter_count,
@@ skipping 3809 matching lines @@
   }
   UNREACHABLE();
 }
 
 Expression* Parser::SpreadCall(Expression* function,
                                ZoneList<Expression*>* args, int pos) {
   if (function->IsSuperCallReference()) {
     // Super calls
     // $super_constructor = %_GetSuperConstructor(<this-function>)
     // %reflect_construct($super_constructor, args, new.target)
+
+    bool only_last_arg_is_spread = false;
+    for (int i = 0; i < args->length(); i++) {
+      if (args->at(i)->IsSpread()) {
+        if (i == args->length() - 1) {
+          only_last_arg_is_spread = true;
+        }
+        break;
+      }
+    }
+
+    if (only_last_arg_is_spread) {
+      // Handle in BytecodeGenerator
+      Expression* super_call_ref = NewSuperCallReference(pos);
+      return factory()->NewCall(super_call_ref, args, pos);
+    }
+    args = PrepareSpreadArguments(args);
     ZoneList<Expression*>* tmp = new (zone()) ZoneList<Expression*>(1, zone());
     tmp->Add(function->AsSuperCallReference()->this_function_var(), zone());
     Expression* super_constructor = factory()->NewCallRuntime(
         Runtime::kInlineGetSuperConstructor, tmp, pos);
     args->InsertAt(0, super_constructor, zone());
     args->Add(function->AsSuperCallReference()->new_target_var(), zone());
     return factory()->NewCallRuntime(Context::REFLECT_CONSTRUCT_INDEX, args,
                                      pos);
   } else {
+    args = PrepareSpreadArguments(args);
     if (function->IsProperty()) {
       // Method calls
       if (function->AsProperty()->IsSuperAccess()) {
         Expression* home = ThisExpression(kNoSourcePosition);
         args->InsertAt(0, function, zone());
         args->InsertAt(1, home, zone());
       } else {
         Variable* temp = NewTemporary(ast_value_factory()->empty_string());
         VariableProxy* obj = factory()->NewVariableProxy(temp);
         Assignment* assign_obj = factory()->NewAssignment(
@@ skipping 1372 matching lines @@
 
   return final_loop;
 }
 
 #undef CHECK_OK
 #undef CHECK_OK_VOID
 #undef CHECK_FAILED
 
 }  // namespace internal
 }  // namespace v8