pt-unop.cc

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1996-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
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////////////////////////////////////////////////////////////////////////
 
#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif
 
#include "interpreter.h"
#include "ov.h"
#include "profiler.h"
#include "pt-unop.h"
 
namespace octave
{
  // Unary expressions.
 
  std::string
  tree_unary_expression::oper (void) const
  {
    return octave_value::unary_op_as_string (m_etype);
  }
 
  // Prefix expressions.
 
  tree_expression *
  tree_prefix_expression::dup (symbol_scope& scope) const
  {
    tree_prefix_expression *new_pe
      = new tree_prefix_expression (m_op ? m_op->dup (scope) : nullptr,
                                    line (), column (), m_etype);
 
    new_pe->copy_base (*this);
 
    return new_pe;
  }
 
  octave_value
  tree_prefix_expression::evaluate (tree_evaluator& tw, int)
  {
    octave_value val;
 
    if (m_op)
      {
        if (m_etype == octave_value::op_incr
            || m_etype == octave_value::op_decr)
          {
            octave_lvalue op_ref = m_op->lvalue (tw);
 
            profiler::enter<tree_prefix_expression>
              block (tw.get_profiler (), *this);
 
            op_ref.do_unary_op (m_etype);
 
            val = op_ref.value ();
          }
        else
          {
            octave_value op_val = m_op->evaluate (tw);
 
            if (op_val.is_defined ())
              {
                profiler::enter<tree_prefix_expression>
                  block (tw.get_profiler (), *this);
 
                // Attempt to do the operation in-place if it is unshared
                // (a temporary expression).
                if (op_val.get_count () == 1)
                  val = op_val.do_non_const_unary_op (m_etype);
                else
                  {
                    interpreter& interp = tw.get_interpreter ();
 
                    type_info& ti = interp.get_type_info ();
 
                    val = ::do_unary_op (ti, m_etype, op_val);
                  }
              }
          }
      }
 
    return val;
  }
 
  // Postfix expressions.
 
  tree_expression *
  tree_postfix_expression::dup (symbol_scope& scope) const
  {
    tree_postfix_expression *new_pe
      = new tree_postfix_expression (m_op ? m_op->dup (scope) : nullptr,
                                     line (), column (), m_etype);
 
    new_pe->copy_base (*this);
 
    return new_pe;
  }
 
  octave_value
  tree_postfix_expression::evaluate (tree_evaluator& tw, int)
  {
    octave_value val;
 
    if (m_op)
      {
        if (m_etype == octave_value::op_incr
            || m_etype == octave_value::op_decr)
          {
            octave_lvalue ref = m_op->lvalue (tw);
 
            val = ref.value ();
 
            profiler::enter<tree_postfix_expression>
              block (tw.get_profiler (), *this);
 
            ref.do_unary_op (m_etype);
          }
        else
          {
            octave_value op_val = m_op->evaluate (tw);
 
            if (op_val.is_defined ())
              {
                profiler::enter<tree_postfix_expression>
                  block (tw.get_profiler (), *this);
 
                interpreter& interp = tw.get_interpreter ();
 
                type_info& ti = interp.get_type_info ();
 
                val = ::do_unary_op (ti, m_etype, op_val);
              }
          }
      }
 
    return val;
  }
}