// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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//       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
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#include "v8.h"

#include "codegen-inl.h"
#include "register-allocator-inl.h"
#include "virtual-frame-inl.h"

namespace v8 {
namespace internal {

// -------------------------------------------------------------------------
// VirtualFrame implementation.

// If there are any registers referenced only by the frame, spill one.
Register VirtualFrame::SpillAnyRegister() {
  // Find the leftmost (ordered by register number) register whose only
  // reference is in the frame.
  for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
    if (is_used(i) && cgen()->allocator()->count(i) == 1) {
      SpillElementAt(register_location(i));
      ASSERT(!cgen()->allocator()->is_used(i));
      return RegisterAllocator::ToRegister(i);
    }
  }
  return no_reg;
}


// Specialization of List::ResizeAdd to non-inlined version for FrameElements.
// The function ResizeAdd becomes a real function, whose implementation is the
// inlined ResizeAddInternal.
template <>
void List<FrameElement,
          FreeStoreAllocationPolicy>::ResizeAdd(const FrameElement& element) {
  ResizeAddInternal(element);
}

} }  // namespace v8::internal