[builtins] Some refactoring on the builtin mechanism.

src/arm64/builtins-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 20 matching lines @@
   // Load the InternalArray function from the native context.
   __ LoadNativeContextSlot(Context::INTERNAL_ARRAY_FUNCTION_INDEX, result);
 }
 
 
 void Builtins::Generate_Adaptor(MacroAssembler* masm,
                                 CFunctionId id,
                                 BuiltinExtraArguments extra_args) {
   // ----------- S t a t e -------------
   //  -- x0                 : number of arguments excluding receiver
-  //  -- x1                 : called function
+  //  -- x1                 : target
+  //  -- x3                 : new target
   //  -- sp[0]              : last argument
   //  -- ...
   //  -- sp[4 * (argc - 1)] : first argument
   //  -- sp[4 * argc]       : receiver
   // -----------------------------------
   __ AssertFunction(x1);
 
   // Insert extra arguments.
   int num_extra_args = 0;
-  if (extra_args == NEEDS_CALLED_FUNCTION) {
-    num_extra_args = 1;
-    __ Push(x1);
-  } else {
-    DCHECK(extra_args == NO_EXTRA_ARGUMENTS);
+  switch (extra_args) {
+    case BuiltinExtraArguments::kTarget:
+      __ Push(x1);
+      ++num_extra_args;
+      break;
+    case BuiltinExtraArguments::kNewTarget:
+      __ Push(x3);
+      ++num_extra_args;
+      break;
+    case BuiltinExtraArguments::kTargetAndNewTarget:
+      __ Push(x1, x3);
+      num_extra_args += 2;
+      break;
+    case BuiltinExtraArguments::kNone:
+      break;
   }
 
   // JumpToExternalReference expects x0 to contain the number of arguments
   // including the receiver and the extra arguments.
   __ Add(x0, x0, num_extra_args + 1);
 
   __ JumpToExternalReference(ExternalReference(id, masm->isolate()));
 }
 
 
@@ skipping 1961 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM