text: /*
     +----------------------------------------------------------------------+
     | HipHop for PHP                                                       |
     +----------------------------------------------------------------------+
     | Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com)     |
     +----------------------------------------------------------------------+
     | This source file is subject to version 3.01 of the PHP license,      |
     | that is bundled with this package in the file LICENSE, and is        |
     | available through the world-wide-web at the following url:           |
     | http://www.php.net/license/3_01.txt                                  |
     | If you did not receive a copy of the PHP license and are unable to   |
     | obtain it through the world-wide-web, please send a note to          |
     | license@php.net so we can mail you a copy immediately.               |
     +----------------------------------------------------------------------+
  */
  #ifndef incl_HPHP_JIT_LAYOUT_H_
  #define incl_HPHP_JIT_LAYOUT_H_
  
  #include "hphp/runtime/base/smart_containers.h"
  #include "hphp/runtime/vm/jit/ir.h"
  #include "hphp/runtime/vm/jit/block.h"
  
  namespace HPHP { namespace JIT {
  
  //////////////////////////////////////////////////////////////////////
  
  /*
   * Information about where to position the blocks in a trace.
   *
   * The blocks are listed in the order they should be positioned, with
   * astubsIt pointing at the place we've split the blocks between a and
   * astubs.
   */
  struct LayoutInfo {
    smart::vector<Block*> blocks;
    smart::vector<Block*>::iterator astubsIt;
  };
  
  /*
   * Determine the order that blocks should be emitted for codegen.  The
   * goal is to minimize branching and put related blocks close to each
   * other.
   */
  LayoutInfo layoutBlocks(IRTrace*, const IRFactory&);
  
  //////////////////////////////////////////////////////////////////////
  
  }}
  
  #endif
  