hphp/compiler/expression/null_coalesce_expression.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #ifndef incl_HPHP_NULL_COALESCE_EXPRESSION_H_
  18 #define incl_HPHP_NULL_COALESCE_EXPRESSION_H_
  19
  20 #include "hphp/compiler/expression/expression.h"
  21
  22 namespace HPHP {
  23 ///////////////////////////////////////////////////////////////////////////////
  24
  25 DECLARE_BOOST_TYPES(NullCoalesceExpression);
  26
  27 struct NullCoalesceExpression : Expression {
  28   NullCoalesceExpression(EXPRESSION_CONSTRUCTOR_PARAMETERS,
  29                          ExpressionPtr expFirst,
  30                          ExpressionPtr expSecond);
  31
  32   DECLARE_EXPRESSION_VIRTUAL_FUNCTIONS;
  33   ExpressionPtr preOptimize(AnalysisResultConstPtr ar) override;
  34   int getLocalEffects() const override { return NoEffect; }
  35
  36   ExpressionPtr unneededHelper() override;
  37   ExpressionPtr getFirst() const { return m_expFirst; }
  38   ExpressionPtr getSecond() const { return m_expSecond; }
  39 private:
  40   ExpressionPtr m_expFirst;
  41   ExpressionPtr m_expSecond;
  42 };
  43
  44 ///////////////////////////////////////////////////////////////////////////////
  45 }
  46
  47 #endif // incl_HPHP_NULL_COALESCE_EXPRESSION_H_