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annotate src/pt-unop.cc @ 10614:d1194069e58c

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optimize code handling ++,--
author Jaroslav Hajek <highegg@gmail.com>
date Sat, 08 May 2010 15:15:22 +0200
parents 57a59eae83cc
children fd0a3ac60b0e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2004, 2005, 2006,
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4 2007, 2008, 2009 John W. Eaton
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 #include "error.h"
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29 #include "oct-obj.h"
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30 #include "oct-lvalue.h"
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31 #include "ov.h"
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32 #include "pt-bp.h"
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33 #include "pt-unop.h"
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34 #include "pt-walk.h"
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35
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36 // Unary expressions.
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37
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38 std::string
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39 tree_unary_expression::oper (void) const
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40 {
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41 return octave_value::unary_op_as_string (etype);
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42 }
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43
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44 // Prefix expressions.
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45
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46 octave_value_list
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47 tree_prefix_expression::rvalue (int nargout)
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48 {
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49 octave_value_list retval;
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50
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51 if (nargout > 1)
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52 error ("prefix operator `%s': invalid number of output arguments",
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53 oper () . c_str ());
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54 else
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55 retval = rvalue1 (nargout);
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56
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57 return retval;
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58 }
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59
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60 octave_value
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61 tree_prefix_expression::rvalue1 (int)
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62 {
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63 octave_value retval;
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64
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65 if (error_state)
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66 return retval;
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67
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68 if (op)
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69 {
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70 if (etype == octave_value::op_incr || etype == octave_value::op_decr)
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71 {
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72 octave_lvalue ref = op->lvalue ();
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73
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74 if (! error_state)
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75 {
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76 ref.do_unary_op (etype);
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77
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78 if (! error_state)
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79 retval = ref.value ();
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80 }
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81 }
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82 else
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83 {
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84 octave_value val = op->rvalue1 ();
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85
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86 if (! error_state && val.is_defined ())
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87 {
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88 // Attempt to do the operation in-place if it is unshared
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89 // (a temporary expression).
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90 if (val.get_count () == 1)
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91 retval = val.do_non_const_unary_op (etype);
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92 else
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93 retval = ::do_unary_op (etype, val);
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94
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95 if (error_state)
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96 retval = octave_value ();
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97 }
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98 }
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99 }
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100
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101 return retval;
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102 }
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103
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104 tree_expression *
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105 tree_prefix_expression::dup (symbol_table::scope_id scope,
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106 symbol_table::context_id context) const
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107 {
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108 tree_prefix_expression *new_pe
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109 = new tree_prefix_expression (op ? op->dup (scope, context) : 0,
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110 line (), column (), etype);
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111
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112 new_pe->copy_base (*this);
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113
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114 return new_pe;
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115 }
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116
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117 void
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118 tree_prefix_expression::accept (tree_walker& tw)
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119 {
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120 tw.visit_prefix_expression (*this);
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121 }
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122
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123 // Postfix expressions.
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124
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125 octave_value_list
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126 tree_postfix_expression::rvalue (int nargout)
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127 {
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128 octave_value_list retval;
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129
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130 if (nargout > 1)
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131 error ("postfix operator `%s': invalid number of output arguments",
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132 oper () . c_str ());
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133 else
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134 retval = rvalue1 (nargout);
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135
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136 return retval;
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137 }
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138
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139 octave_value
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140 tree_postfix_expression::rvalue1 (int)
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141 {
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142 octave_value retval;
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143
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144 if (error_state)
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145 return retval;
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146
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147 if (op)
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148 {
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149 if (etype == octave_value::op_incr || etype == octave_value::op_decr)
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150 {
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151 octave_lvalue ref = op->lvalue ();
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152
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153 if (! error_state)
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154 {
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155 retval = ref.value ();
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156
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157 ref.do_unary_op (etype);
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158 }
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159 }
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160 else
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161 {
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162 octave_value val = op->rvalue1 ();
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163
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164 if (! error_state && val.is_defined ())
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165 {
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166 retval = ::do_unary_op (etype, val);
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167
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168 if (error_state)
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169 retval = octave_value ();
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170 }
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171 }
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172 }
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173
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174 return retval;
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175 }
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176
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177 tree_expression *
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178 tree_postfix_expression::dup (symbol_table::scope_id scope,
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179 symbol_table::context_id context) const
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180 {
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181 tree_postfix_expression *new_pe
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182 = new tree_postfix_expression (op ? op->dup (scope, context) : 0,
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183 line (), column (), etype);
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184
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185 new_pe->copy_base (*this);
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186
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187 return new_pe;
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188 }
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189
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190 void
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191 tree_postfix_expression::accept (tree_walker& tw)
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192 {
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193 tw.visit_postfix_expression (*this);
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194 }