DBC: Fleshing out the polymorphic instance call instruction

runtime/vm/locations.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_LOCATIONS_H_
 #define VM_LOCATIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/bitfield.h"
@@ skipping 380 matching lines @@
   }
 
   class KindField : public BitField<uword, Kind, 0, kBitsForKind> {};
   class PayloadField :
       public BitField<uword, uword, kBitsForKind, kBitsForPayload> {};
 
   // Layout for kUnallocated locations payload.
   typedef BitField<uword, Policy, 0, 3> PolicyField;
 
   // Layout for stack slots.
+#if defined(ARCH_IS_64_BIT)
+  static const intptr_t kBitsForBaseReg = 6;
+#else
   static const intptr_t kBitsForBaseReg = 5;
+#endif
   static const intptr_t kBitsForStackIndex = kBitsForPayload - kBitsForBaseReg;
   class StackSlotBaseField :
       public BitField<uword, Register, 0, kBitsForBaseReg> {};
   class StackIndexField :
       public BitField<uword, intptr_t, kBitsForBaseReg, kBitsForStackIndex> {};
   COMPILE_ASSERT(1 << kBitsForBaseReg >= kNumberOfCpuRegisters);
 
   static const intptr_t kStackIndexBias =
       static_cast<intptr_t>(1) << (kBitsForStackIndex - 1);
 
@@ skipping 305 matching lines @@
 
 #if defined(DEBUG)
   intptr_t writable_inputs_;
 #endif
 };
 
 
 }  // namespace dart
 
 #endif  // VM_LOCATIONS_H_