Improve algorithm for detaching and attaching a virtual frame to the code...

src/register-allocator.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 54 matching lines @@
     cgen_->allocator()->Use(reg());
   } else if (is_constant()) {
     destination->data_.handle_ = data_.handle_;
   } else {
     ASSERT(!is_valid());
   }
 }
 
 
 // -------------------------------------------------------------------------
-// RegisterFile implementation.
-
-void RegisterFile::CopyTo(RegisterFile* other) {
-  for (int i = 0; i < kNumRegisters; i++) {
-    other->ref_counts_[i] = ref_counts_[i];
-  }
-}
-
-
-// -------------------------------------------------------------------------
 // RegisterAllocator implementation.
 
 
 Result RegisterAllocator::AllocateWithoutSpilling() {
   // Return the first free register, if any.
   int free_reg = registers_.ScanForFreeRegister();
   if (free_reg < kNumRegisters) {
     Register free_result = { free_reg };
     return Result(free_result, cgen_);
   }
@@ skipping 28 matching lines @@
     cgen_->frame()->Spill(target);
     ASSERT(!is_used(target));
     return Result(target, cgen_);
   }
   // Otherwise (if it's referenced outside the frame) we cannot allocate it.
   return Result(cgen_);
 }
 
 
 } }  // namespace v8::internal