text: /*
   * Copyright (C) 2012-2014, 2016 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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 with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
   */
  
  #pragma once
  
  #if !ENABLE(JIT)
  
  #include "CLoopStack.h"
  #include "CallFrame.h"
  #include "CodeBlock.h"
  #include "VM.h"
  
  namespace JSC {
  
  inline bool CLoopStack::ensureCapacityFor(Register* newTopOfStack)
  {
      Register* newEnd = newTopOfStack - 1;
      if (newEnd >= m_end)
          return true;
      return grow(newTopOfStack);
  }
  
  inline Register* CLoopStack::topOfFrameFor(CallFrame* frame)
  {
      if (UNLIKELY(!frame))
          return baseOfStack();
      return frame->topOfFrame() - 1;
  }
  
  inline Register* CLoopStack::topOfStack()
  {
      return topOfFrameFor(m_topCallFrame);
  }
  
  inline void CLoopStack::shrink(Register* newTopOfStack)
  {
      Register* newEnd = newTopOfStack - 1;
      if (newEnd >= m_end)
          return;
      setCLoopStackLimit(newTopOfStack);
      // Note: Clang complains of an unresolved linkage to maxExcessCapacity if
      // invoke std::max() with it as an argument. To work around this, we first
      // assign the constant to a local variable, and use the local instead.
      ptrdiff_t maxExcessCapacity = CLoopStack::maxExcessCapacity;
      ptrdiff_t maxExcessInRegisters = std::max(maxExcessCapacity, m_softReservedZoneSizeInRegisters);
      if (m_end == baseOfStack() && (highAddress() - m_commitTop) >= maxExcessInRegisters)
          releaseExcessCapacity();
  }
  
  inline void CLoopStack::setCLoopStackLimit(Register* newTopOfStack)
  {
      Register* newEnd = newTopOfStack - 1;
      m_end = newEnd;
      m_vm.setCLoopStackLimit(newTopOfStack);
  }
  
  } // namespace JSC
  
  #endif // !ENABLE(JIT)
  