[stubs] An easier way of defining a stub call interface descriptor.

src/ppc/interface-descriptors-ppc.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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
 
 const Register CallInterfaceDescriptor::ContextRegister() { return cp; }
 
+void CallInterfaceDescriptor::DefaultInitializePlatformSpecific(
+    CallInterfaceDescriptorData* data, int register_parameter_count) {
+  const Register default_stub_registers[] = {r3, r4, r5, r6, r7};
+  CHECK_LE(static_cast<size_t>(register_parameter_count),
+           arraysize(default_stub_registers));
+  data->InitializePlatformSpecific(register_parameter_count,
+                                   default_stub_registers);
+}
 
 const Register LoadDescriptor::ReceiverRegister() { return r4; }
 const Register LoadDescriptor::NameRegister() { return r5; }
 const Register LoadDescriptor::SlotRegister() { return r3; }
 
 
 const Register LoadWithVectorDescriptor::VectorRegister() { return r6; }
 
 
 const Register StoreDescriptor::ReceiverRegister() { return r4; }
@@ skipping 387 matching lines @@
       r3,  // the value to pass to the generator
       r4,  // the JSGeneratorObject to resume
       r5   // the resume mode (tagged)
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC