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annotate libinterp/parse-tree/pt-assign.h @ 33657:6f2baadfdb3d bytecode-interpreter tip

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maint: Merge default to bytecode-interpreter.
author Nicholas R. Jankowski <jankowski.nicholas@gmail.com>
date Tue, 04 Jun 2024 20:06:05 -0400
parents d422992b5483
children
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 1996-2024 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if ! defined (octave_pt_assign_h)
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27 #define octave_pt_assign_h 1
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28
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29 #include "octave-config.h"
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30
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31 #include <iosfwd>
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32 #include <string>
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33
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34 class octave_value;
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35 class octave_value_list;
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36
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37 #include "comment-list.h"
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38 #include "ov.h"
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39 #include "pt-arg-list.h"
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40 #include "pt-exp.h"
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41 #include "pt-walk.h"
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42 #include "token.h"
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43
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44 OCTAVE_BEGIN_NAMESPACE(octave)
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45
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46 class symbol_scope;
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47 class octave_lvalue;
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48 class tree_argument_list;
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49
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50 // Simple assignment expressions.
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51
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52 class tree_simple_assignment : public tree_expression
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53 {
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54 public:
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55
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56 tree_simple_assignment (tree_expression *le, tree_expression *re, bool plhs = false, octave_value::assign_op t = octave_value::op_asn_eq);
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57
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58 OCTAVE_DISABLE_COPY_MOVE (tree_simple_assignment)
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59
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60 ~tree_simple_assignment ();
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61
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62 comment_list leading_comments () const { return m_lhs->leading_comments (); }
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63
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64 filepos beg_pos () const { return m_lhs->beg_pos (); }
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65 filepos end_pos () const { return m_rhs->end_pos (); }
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66
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67 bool rvalue_ok () const { return true; }
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68
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69 bool is_assignment_expression () const { return true; }
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70
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71 std::string oper () const;
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72
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73 tree_expression * left_hand_side () { return m_lhs; }
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74
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75 tree_expression * right_hand_side () { return m_rhs; }
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76
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77 tree_expression * dup (symbol_scope& scope) const;
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78
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79 octave_value evaluate (tree_evaluator& tw, int nargout = 1);
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80
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81 octave_value_list evaluate_n (tree_evaluator& tw, int nargout = 1)
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82 {
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83 return ovl (evaluate (tw, nargout));
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84 }
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85
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86 void accept (tree_walker& tw)
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87 {
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88 tw.visit_simple_assignment (*this);
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89 }
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90
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91 octave_value::assign_op op_type () const { return m_etype; }
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92
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93 private:
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94
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95 void do_assign (octave_lvalue& ult, const octave_value_list& args,
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96 const octave_value& rhs_val);
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97
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98 void do_assign (octave_lvalue& ult, const octave_value& rhs_val);
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99
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100 // The left hand side of the assignment.
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101 tree_expression *m_lhs;
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102
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103 // The right hand side of the assignment.
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104 tree_expression *m_rhs;
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105
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106 // True if we should not delete the lhs.
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107 bool m_preserve;
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108
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109 // True if this is an assignment to the automatic variable ans.
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110 bool m_ans_assign;
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111
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112 // The type of the expression.
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113 octave_value::assign_op m_etype;
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114 };
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115
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116 // Multi-valued assignment expressions.
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117
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118 class tree_multi_assignment : public tree_expression
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119 {
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120 public:
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121
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122 tree_multi_assignment (bool plhs = false)
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123 : m_lhs (nullptr), m_rhs (nullptr), m_preserve (plhs)
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124 { }
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125
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126 tree_multi_assignment (tree_argument_list *lst, tree_expression *r, bool plhs = false);
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127
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128 OCTAVE_DISABLE_COPY_MOVE (tree_multi_assignment)
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129
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130 ~tree_multi_assignment ();
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131
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132 bool is_assignment_expression () const { return true; }
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133
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134 filepos beg_pos () const { return m_lhs->beg_pos (); }
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135 filepos end_pos () const { return m_rhs->end_pos (); }
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136
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137 bool rvalue_ok () const { return true; }
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138
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139 std::string oper () const;
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140
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141 tree_argument_list * left_hand_side () { return m_lhs; }
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142
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143 tree_expression * right_hand_side () { return m_rhs; }
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144
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145 tree_expression * dup (symbol_scope& scope) const;
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146
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147 octave_value evaluate (tree_evaluator& tw, int nargout = 1)
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148 {
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149 octave_value_list retval = evaluate_n (tw, nargout);
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150
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151 return retval.length () > 0 ? retval(0) : octave_value ();
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152 }
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153
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154 octave_value_list evaluate_n (tree_evaluator& tw, int nargout = 1);
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155
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156 void accept (tree_walker& tw)
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157 {
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158 tw.visit_multi_assignment (*this);
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159 }
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160
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161 octave_value::assign_op op_type () const
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162 {
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163 return octave_value::op_asn_eq;
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164 }
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165
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166 private:
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167
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168 // The left hand side of the assignment.
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169 tree_argument_list *m_lhs;
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170
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171 // The right hand side of the assignment.
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172 tree_expression *m_rhs;
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173
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174 // True if we should not delete the lhs.
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175 bool m_preserve;
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176 };
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177
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178 OCTAVE_END_NAMESPACE(octave)
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179
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180 #endif