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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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1315
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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1297
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23 #if defined (__GNUG__) |
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24 #pragma implementation |
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25 #endif |
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26 |
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240
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27 #ifdef HAVE_CONFIG_H |
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1192
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28 #include <config.h> |
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1
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29 #endif |
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30 |
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3013
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31 #include <cassert> |
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1962
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32 #include <cctype> |
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3013
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33 #include <climits> |
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34 |
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35 #include <iomanip.h> |
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1962
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36 |
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2926
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37 #include "glob-match.h" |
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1755
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38 #include "str-vec.h" |
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39 |
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1352
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40 #include "error.h" |
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2979
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41 #include "oct-lvalue.h" |
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2975
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42 #include "ov.h" |
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3013
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43 #include "pager.h" |
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1755
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44 #include "symtab.h" |
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1
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45 #include "utils.h" |
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1352
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46 #include "variables.h" |
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1
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47 |
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3013
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48 octave_allocator |
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49 symbol_record::symbol_def::allocator (sizeof (symbol_record::symbol_def)); |
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195
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50 |
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767
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51 // Individual records in a symbol table. |
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52 |
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3013
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53 // XXX FIXME XXX -- there are lots of places below where we should |
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54 // probably be temporarily ignoring interrupts. |
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1
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55 |
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572
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56 void |
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1755
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57 symbol_record::rename (const string& new_name) |
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572
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58 { |
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2791
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59 if (! read_only_error ("rename")) |
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60 nm = new_name; |
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572
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61 } |
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62 |
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3013
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63 void |
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64 symbol_record::define (const octave_value& v, unsigned int sym_type) |
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195
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65 { |
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3013
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66 if (! (is_variable () && read_only_error ("redefine"))) |
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67 { |
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68 if (is_function ()) |
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69 push_def (new symbol_def ()); |
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195
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70 |
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3013
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71 if (definition->type () == symbol_record::BUILTIN_VARIABLE) |
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72 sym_type = symbol_record::BUILTIN_VARIABLE; |
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1
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73 |
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3013
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74 definition->define (v, sym_type); |
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195
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75 } |
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76 } |
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77 |
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78 void |
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3013
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79 symbol_record::define_builtin_var (const octave_value& v) |
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195
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80 { |
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3013
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81 define (v, symbol_record::BUILTIN_VARIABLE); |
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195
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82 |
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3013
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83 if (chg_fcn) |
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84 chg_fcn (); |
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1
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85 } |
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86 |
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3013
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87 bool |
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88 symbol_record::define_as_fcn (const octave_value& v) |
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1
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89 { |
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3013
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90 bool retval = false; |
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1
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91 |
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3013
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92 if (! (is_variable () || read_only_error ("redefine"))) |
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195
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93 { |
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3013
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94 replace_all_defs (new symbol_def (v, symbol_record::BUILTIN_FUNCTION)); |
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2893
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95 |
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3013
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96 retval = true; |
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1
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97 } |
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98 |
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2893
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99 return retval; |
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2390
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100 } |
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101 |
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3013
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102 bool |
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103 symbol_record::define (octave_function *f, unsigned int sym_type) |
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1
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104 { |
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3013
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105 bool retval = false; |
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2949
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106 |
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3013
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107 if (! read_only_error ("redefine")) |
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108 { |
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109 octave_value tmp (f); |
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110 |
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111 replace_all_defs (new symbol_def (tmp, sym_type)); |
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112 |
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113 retval = true; |
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114 } |
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2949
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115 |
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116 return retval; |
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1
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117 } |
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118 |
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119 void |
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195
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120 symbol_record::clear (void) |
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1
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121 { |
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195
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122 if (linked_to_global) |
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1
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123 { |
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3013
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124 if (--definition->count <= 0) |
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125 delete definition; |
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126 |
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127 definition = new symbol_def (); |
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128 |
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195
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129 linked_to_global = 0; |
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1
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130 } |
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2846
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131 else if (! tagged_static) |
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195
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132 { |
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3013
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133 remove_top_def (); |
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134 |
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135 if (! definition) |
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136 definition = new symbol_def (); |
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195
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137 } |
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1
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138 } |
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139 |
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140 void |
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3013
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141 symbol_record::alias (symbol_record *s, bool /* force */) |
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1
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142 { |
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3013
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143 chg_fcn = s->chg_fcn; |
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195
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144 |
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3013
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145 replace_all_defs (s->definition); |
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146 |
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147 definition->count++; |
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1
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148 } |
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149 |
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150 void |
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151 symbol_record::mark_as_formal_parameter (void) |
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152 { |
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3013
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153 if (is_linked_to_global ()) |
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154 error ("can't mark global variable `%s' as function parameter", |
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155 nm.c_str ()); |
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156 else if (is_static ()) |
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157 error ("can't mark static variable `%s' as function paraemter", |
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158 nm.c_str ()); |
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159 else |
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160 formal_param = 1; |
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1
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161 } |
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162 |
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163 void |
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195
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164 symbol_record::mark_as_linked_to_global (void) |
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122
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165 { |
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2975
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166 if (is_formal_parameter ()) |
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167 error ("can't make function parameter `%s' global", nm.c_str ()); |
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168 else if (is_static ()) |
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169 error ("can't make static variable `%s' global", nm.c_str ()); |
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170 else |
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171 linked_to_global = 1; |
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122
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172 } |
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173 |
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2846
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174 void |
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175 symbol_record::mark_as_static (void) |
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176 { |
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177 if (is_linked_to_global ()) |
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2975
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178 error ("can't make global variable `%s' static", nm.c_str ()); |
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2846
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179 else if (is_formal_parameter ()) |
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2975
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180 error ("can't make formal parameter `%s' static", nm.c_str ()); |
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2846
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181 else |
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182 tagged_static = 1; |
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183 } |
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184 |
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2856
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185 bool |
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3013
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186 symbol_record::hides_fcn (void) const |
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2846
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187 { |
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3013
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188 bool retval = false; |
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189 |
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190 if (is_variable () && is_defined ()) |
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191 { |
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192 symbol_def *hidden_def = definition->next_elem; |
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193 |
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194 if (hidden_def && hidden_def->is_builtin_function ()) |
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195 retval = true; |
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196 } |
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197 |
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198 return retval; |
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199 } |
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200 |
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201 bool |
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202 symbol_record::hides_builtin (void) const |
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203 { |
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204 bool retval = false; |
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205 |
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206 if (is_variable () && is_defined ()) |
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207 { |
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208 symbol_def *hidden_def = definition->next_elem; |
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209 |
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210 if (hidden_def && hidden_def->is_user_function ()) |
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211 retval = true; |
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212 } |
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213 |
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214 return retval; |
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2846
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215 } |
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216 |
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2975
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217 octave_value& |
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218 symbol_record::variable_value (void) |
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2390
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219 { |
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2975
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220 static octave_value foo; |
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2390
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221 |
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2975
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222 return is_variable () ? def () : foo; |
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2390
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223 } |
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224 |
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2979
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225 octave_lvalue |
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2390
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226 symbol_record::variable_reference (void) |
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227 { |
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228 if (is_function ()) |
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229 clear (); |
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230 |
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231 if (! is_defined ()) |
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232 { |
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233 if (! (is_formal_parameter () || is_linked_to_global ())) |
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234 link_to_builtin_variable (this); |
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235 |
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236 if (! is_defined ()) |
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2975
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237 { |
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238 octave_value tmp; |
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239 define (tmp); |
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240 } |
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2390
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241 } |
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242 |
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3013
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243 return octave_lvalue (&(def ()), chg_fcn); |
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195
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244 } |
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245 |
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220
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246 void |
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247 symbol_record::push_context (void) |
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248 { |
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2846
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249 if (! is_static ()) |
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250 { |
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251 context.push (definition); |
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3013
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252 |
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253 definition = new symbol_def (); |
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395
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254 |
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2893
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255 global_link_context.push (static_cast<unsigned int> (linked_to_global)); |
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3013
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256 |
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2846
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257 linked_to_global = 0; |
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258 } |
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220
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259 } |
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260 |
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261 void |
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262 symbol_record::pop_context (void) |
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263 { |
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1653
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264 // It is possible for context to be empty if new symbols have been |
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265 // inserted in the symbol table during recursive calls. This can |
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266 // happen as a result of calls to eval() and feval(). |
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220
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267 |
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1653
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268 if (! context.empty ()) |
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220
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269 { |
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3013
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270 replace_all_defs (context.pop ()); |
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1653
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271 |
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272 linked_to_global = global_link_context.pop (); |
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220
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273 } |
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274 } |
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275 |
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3013
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276 void |
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277 symbol_record::print_symbol_info_line (ostream& os) |
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278 { |
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279 os << (is_read_only () ? " r-" : " rw") |
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280 << (is_eternal () ? "-" : "d") |
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281 #if 0 |
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282 << (hides_fcn () ? "f" : (hides_builtin () ? "F" : "-")) |
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283 #endif |
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284 << " " |
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285 << setiosflags (ios::left) << setw (24) << type_name () . c_str (); |
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286 |
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287 os << resetiosflags (ios::left); |
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288 |
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289 int nr = rows (); |
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290 int nc = columns (); |
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291 |
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292 if (nr < 0) |
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293 os << " -"; |
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294 else |
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295 os << setiosflags (ios::right) << setw (7) << nr; |
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296 |
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297 if (nc < 0) |
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298 os << " -"; |
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299 else |
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300 os << setiosflags (ios::right) << setw (7) << nc; |
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301 |
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302 os << resetiosflags (ios::right); |
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303 |
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304 os << " " << name () << "\n"; |
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305 } |
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306 |
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307 bool |
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2791
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308 symbol_record::read_only_error (const char *action) |
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195
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309 { |
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310 if (is_read_only ()) |
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311 { |
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312 if (is_variable ()) |
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3013
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313 ::error ("can't %s read-only constant `%s'", action, nm.c_str ()); |
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195
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314 else if (is_function ()) |
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3013
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315 ::error ("can't %s read-only function `%s'", action, nm.c_str ()); |
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1045
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316 else |
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3013
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317 ::error ("can't %s read-only symbol `%s'", action, nm.c_str ()); |
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195
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318 |
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3013
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319 return true; |
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195
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320 } |
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321 else |
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3013
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322 return false; |
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195
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323 } |
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324 |
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325 void |
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326 symbol_record::push_def (symbol_def *sd) |
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327 { |
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530
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328 if (! sd) |
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195
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329 return; |
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330 |
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3013
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331 assert (definition == 0 || definition->next_elem == 0); |
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332 |
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195
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333 sd->next_elem = definition; |
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3013
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334 |
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195
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335 definition = sd; |
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336 } |
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337 |
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3013
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338 void |
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339 symbol_record::remove_top_def (void) |
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195
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340 { |
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341 symbol_def *top = definition; |
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342 |
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3013
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343 definition = definition->next_elem; |
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2404
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344 |
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3013
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345 if (--top->count <= 0) |
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346 delete top; |
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195
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347 } |
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348 |
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3013
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349 void |
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350 symbol_record::replace_all_defs (symbol_def *sd) |
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195
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351 { |
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3013
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352 while (definition) |
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353 remove_top_def (); |
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2404
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354 |
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3013
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355 push_def (sd); |
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195
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356 } |
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357 |
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767
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358 // A symbol table. |
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1
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359 |
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360 symbol_record * |
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2856
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361 symbol_table::lookup (const string& nm, bool insert, bool warn) |
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1
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362 { |
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3013
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363 unsigned int index = hash (nm); |
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1
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364 |
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365 symbol_record *ptr = table[index].next (); |
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366 |
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530
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367 while (ptr) |
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1
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368 { |
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1755
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369 if (ptr->name () == nm) |
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1
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370 return ptr; |
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3013
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371 |
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1
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372 ptr = ptr->next (); |
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373 } |
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374 |
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375 if (insert) |
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376 { |
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3013
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377 symbol_record *sr = new symbol_record (nm, table[index].next ()); |
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378 |
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379 table[index].chain (sr); |
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380 |
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381 return sr; |
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1
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382 } |
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383 else if (warn) |
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1755
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384 warning ("lookup: symbol`%s' not found", nm.c_str ()); |
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1
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385 |
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530
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386 return 0; |
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1
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387 } |
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388 |
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389 void |
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1755
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390 symbol_table::rename (const string& old_name, const string& new_name) |
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572
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391 { |
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3013
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392 unsigned int index = hash (old_name); |
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572
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393 |
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394 symbol_record *prev = &table[index]; |
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395 symbol_record *ptr = prev->next (); |
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396 |
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397 while (ptr) |
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398 { |
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1755
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399 if (ptr->name () == old_name) |
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572
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400 { |
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401 ptr->rename (new_name); |
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402 |
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2791
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403 if (! error_state) |
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404 { |
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405 prev->chain (ptr->next ()); |
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406 |
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3013
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407 index = hash (new_name); |
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3125
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408 ptr->chain (table[index].next ()); |
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2791
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409 table[index].chain (ptr); |
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410 |
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411 return; |
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412 } |
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413 |
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414 break; |
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572
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415 } |
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416 |
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417 prev = ptr; |
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418 ptr = ptr->next (); |
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419 } |
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420 |
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1755
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421 error ("unable to rename `%s' to `%s'", old_name.c_str (), |
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422 new_name.c_str ()); |
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572
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423 } |
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424 |
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425 void |
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2856
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426 symbol_table::clear (bool clear_user_functions) |
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1
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427 { |
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3013
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428 for (unsigned int i = 0; i < table_size; i++) |
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1
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429 { |
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169
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430 symbol_record *ptr = table[i].next (); |
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1
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431 |
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530
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432 while (ptr) |
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169
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433 { |
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195
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434 if (ptr->is_user_variable () |
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435 || (clear_user_functions && ptr->is_user_function ())) |
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436 { |
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437 ptr->clear (); |
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438 } |
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439 |
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169
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440 ptr = ptr->next (); |
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1
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441 } |
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442 } |
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443 } |
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444 |
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3013
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445 bool |
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2856
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446 symbol_table::clear (const string& nm, bool clear_user_functions) |
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1
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447 { |
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3013
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448 unsigned int index = hash (nm); |
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1
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449 |
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195
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450 symbol_record *ptr = table[index].next (); |
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1
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451 |
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530
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452 while (ptr) |
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1
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453 { |
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1755
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454 if (ptr->name () == nm |
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195
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455 && (ptr->is_user_variable () |
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456 || (clear_user_functions && ptr->is_user_function ()))) |
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1
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457 { |
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195
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458 ptr->clear (); |
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3013
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459 return true; |
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1
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460 } |
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195
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461 ptr = ptr->next (); |
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1
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462 } |
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463 |
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3013
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464 return false; |
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1
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465 } |
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466 |
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467 int |
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164
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468 symbol_table::size (void) const |
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1
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469 { |
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470 int count = 0; |
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3013
|
471 |
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472 for (unsigned int i = 0; i < table_size; i++) |
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1
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473 { |
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474 symbol_record *ptr = table[i].next (); |
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3013
|
475 |
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530
|
476 while (ptr) |
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1
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477 { |
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478 count++; |
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479 ptr = ptr->next (); |
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480 } |
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481 } |
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3013
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482 |
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1
|
483 return count; |
|
|
484 } |
|
|
485 |
|
3013
|
486 static bool |
|
|
487 matches_patterns (const string& name, const string_vector& pats) |
|
1
|
488 { |
|
3013
|
489 int npats = pats.length (); |
|
1
|
490 |
|
3013
|
491 if (npats == 0) |
|
|
492 return true; |
|
|
493 |
|
|
494 glob_match pattern (pats); |
|
|
495 |
|
|
496 return pattern.match (name); |
|
1
|
497 } |
|
|
498 |
|
3013
|
499 Array<symbol_record *> |
|
|
500 symbol_table::symbol_list (int& count, const string_vector& pats, |
|
|
501 unsigned int type, unsigned int scope) const |
|
1
|
502 { |
|
115
|
503 count = 0; |
|
3013
|
504 |
|
1
|
505 int n = size (); |
|
3013
|
506 |
|
1
|
507 if (n == 0) |
|
530
|
508 return 0; |
|
1
|
509 |
|
3013
|
510 Array<symbol_record *> symbols (n); |
|
|
511 |
|
|
512 for (unsigned int i = 0; i < table_size; i++) |
|
1
|
513 { |
|
|
514 symbol_record *ptr = table[i].next (); |
|
3013
|
515 |
|
530
|
516 while (ptr) |
|
1
|
517 { |
|
|
518 assert (count < n); |
|
867
|
519 |
|
2893
|
520 unsigned int my_scope = ptr->is_linked_to_global () + 1; // Tricky... |
|
867
|
521 |
|
2893
|
522 unsigned int my_type = ptr->type (); |
|
867
|
523 |
|
1755
|
524 string my_name = ptr->name (); |
|
867
|
525 |
|
|
526 if ((type & my_type) && (scope & my_scope) |
|
3013
|
527 && matches_patterns (my_name, pats)) |
|
|
528 symbols(count++) = ptr; |
|
605
|
529 |
|
1
|
530 ptr = ptr->next (); |
|
|
531 } |
|
|
532 } |
|
1755
|
533 |
|
|
534 symbols.resize (count); |
|
1
|
535 |
|
3013
|
536 return symbols; |
|
|
537 } |
|
|
538 |
|
|
539 string_vector |
|
|
540 symbol_table::name_list (int& count, const string_vector& pats, bool sort, |
|
|
541 unsigned int type, unsigned int scope) const |
|
|
542 { |
|
|
543 Array<symbol_record *> symbols |
|
|
544 = symbol_list (count, pats, type, scope); |
|
|
545 |
|
|
546 string_vector names; |
|
|
547 |
|
|
548 int n = symbols.length (); |
|
|
549 |
|
|
550 if (n > 0) |
|
|
551 { |
|
|
552 names.resize (n); |
|
|
553 |
|
|
554 for (int i = 0; i < n; i++) |
|
|
555 names[i] = symbols(i)->name (); |
|
|
556 } |
|
|
557 |
|
|
558 if (sort) |
|
|
559 names.qsort (); |
|
|
560 |
|
|
561 return names; |
|
|
562 } |
|
|
563 |
|
|
564 static int |
|
|
565 maybe_list_cmp_fcn (symbol_record **a_arg, symbol_record **b_arg) |
|
|
566 { |
|
|
567 string a = (*a_arg)->name (); |
|
|
568 string b = (*b_arg)->name (); |
|
|
569 |
|
|
570 return a.compare (b); |
|
|
571 } |
|
1
|
572 |
|
3013
|
573 int |
|
|
574 symbol_table::maybe_list (const char *header, const string_vector& argv, |
|
|
575 ostream& os, bool show_verbose, |
|
|
576 unsigned type, unsigned scope) |
|
|
577 { |
|
|
578 int count; |
|
|
579 |
|
|
580 int status = 0; |
|
|
581 |
|
|
582 if (show_verbose) |
|
|
583 { |
|
|
584 Array<symbol_record *> symbols = symbol_list (count, argv, type, scope); |
|
|
585 |
|
|
586 int len = symbols.length (); |
|
|
587 |
|
|
588 if (len > 0 && count > 0) |
|
|
589 { |
|
|
590 os << "\n" << header << "\n\n" |
|
|
591 << "prot type rows cols name\n" |
|
|
592 << "==== ==== ==== ==== ====\n"; |
|
|
593 |
|
|
594 symbols.qsort (maybe_list_cmp_fcn); |
|
|
595 |
|
|
596 for (int i = 0; i < len; i++) |
|
|
597 symbols(i)->print_symbol_info_line (os); |
|
|
598 |
|
|
599 status = 1; |
|
|
600 } |
|
|
601 } |
|
|
602 else |
|
|
603 { |
|
|
604 string_vector symbols = name_list (count, argv, 1, type, scope); |
|
|
605 |
|
|
606 if (symbols.length () > 0 && count > 0) |
|
|
607 { |
|
|
608 os << "\n" << header << "\n\n"; |
|
|
609 |
|
|
610 symbols.list_in_columns (os); |
|
|
611 |
|
|
612 status = 1; |
|
|
613 } |
|
|
614 } |
|
|
615 |
|
|
616 return status; |
|
1
|
617 } |
|
|
618 |
|
605
|
619 symbol_record ** |
|
2893
|
620 symbol_table::glob (int& count, const string& pat, unsigned int type, |
|
|
621 unsigned int scope) const |
|
605
|
622 { |
|
|
623 count = 0; |
|
|
624 int n = size (); |
|
|
625 if (n == 0) |
|
|
626 return 0; |
|
|
627 |
|
|
628 symbol_record **symbols = new symbol_record * [n+1]; |
|
3013
|
629 |
|
|
630 for (unsigned int i = 0; i < table_size; i++) |
|
605
|
631 { |
|
|
632 symbol_record *ptr = table[i].next (); |
|
3013
|
633 |
|
605
|
634 while (ptr) |
|
|
635 { |
|
|
636 assert (count < n); |
|
|
637 |
|
2893
|
638 unsigned int my_scope = ptr->is_linked_to_global () + 1; // Tricky... |
|
605
|
639 |
|
2893
|
640 unsigned int my_type = ptr->type (); |
|
605
|
641 |
|
1792
|
642 glob_match pattern (pat); |
|
1755
|
643 |
|
605
|
644 if ((type & my_type) && (scope & my_scope) |
|
1792
|
645 && pattern.match (ptr->name ())) |
|
605
|
646 { |
|
|
647 symbols[count++] = ptr; |
|
|
648 } |
|
|
649 |
|
|
650 ptr = ptr->next (); |
|
|
651 } |
|
|
652 } |
|
|
653 symbols[count] = 0; |
|
|
654 |
|
|
655 return symbols; |
|
|
656 } |
|
|
657 |
|
220
|
658 void |
|
|
659 symbol_table::push_context (void) |
|
|
660 { |
|
3013
|
661 for (unsigned int i = 0; i < table_size; i++) |
|
220
|
662 { |
|
|
663 symbol_record *ptr = table[i].next (); |
|
|
664 |
|
530
|
665 while (ptr) |
|
220
|
666 { |
|
|
667 ptr->push_context (); |
|
|
668 ptr = ptr->next (); |
|
|
669 } |
|
|
670 } |
|
|
671 } |
|
|
672 |
|
|
673 void |
|
|
674 symbol_table::pop_context (void) |
|
|
675 { |
|
3013
|
676 for (unsigned int i = 0; i < table_size; i++) |
|
220
|
677 { |
|
|
678 symbol_record *ptr = table[i].next (); |
|
|
679 |
|
530
|
680 while (ptr) |
|
220
|
681 { |
|
|
682 ptr->pop_context (); |
|
|
683 ptr = ptr->next (); |
|
|
684 } |
|
|
685 } |
|
|
686 } |
|
|
687 |
|
3013
|
688 void |
|
|
689 symbol_table::print_stats (void) |
|
|
690 { |
|
|
691 int count = 0; |
|
|
692 int empty_chains = 0; |
|
|
693 int max_chain_length = 0; |
|
|
694 int min_chain_length = INT_MAX; |
|
|
695 |
|
|
696 for (unsigned int i = 0; i < table_size; i++) |
|
|
697 { |
|
|
698 int num_this_chain = 0; |
|
|
699 |
|
|
700 symbol_record *ptr = table[i].next (); |
|
|
701 |
|
|
702 if (ptr) |
|
|
703 octave_stdout << "chain number " << i << ":\n"; |
|
|
704 else |
|
|
705 { |
|
|
706 empty_chains++; |
|
|
707 min_chain_length = 0; |
|
|
708 } |
|
|
709 |
|
|
710 while (ptr) |
|
|
711 { |
|
|
712 num_this_chain++; |
|
|
713 |
|
|
714 octave_stdout << " " << ptr->name () << "\n"; |
|
|
715 |
|
|
716 ptr = ptr->next (); |
|
|
717 } |
|
|
718 |
|
|
719 count += num_this_chain; |
|
|
720 |
|
|
721 if (num_this_chain > max_chain_length) |
|
|
722 max_chain_length = num_this_chain; |
|
|
723 |
|
|
724 if (num_this_chain < min_chain_length) |
|
|
725 min_chain_length = num_this_chain; |
|
|
726 |
|
|
727 if (num_this_chain > 0) |
|
|
728 octave_stdout << "\n"; |
|
|
729 } |
|
|
730 |
|
|
731 octave_stdout << "max chain length: " << max_chain_length << "\n"; |
|
|
732 octave_stdout << "min chain length: " << min_chain_length << "\n"; |
|
|
733 octave_stdout << "empty chains: " << empty_chains << "\n"; |
|
|
734 octave_stdout << "total chains: " << table_size << "\n"; |
|
|
735 octave_stdout << "total symbols: " << count << "\n"; |
|
|
736 } |
|
|
737 |
|
1
|
738 // Chris Torek's fave hash function. |
|
|
739 |
|
|
740 unsigned int |
|
1755
|
741 symbol_table::hash (const string& str) |
|
1
|
742 { |
|
2893
|
743 unsigned int h = 0; |
|
3013
|
744 |
|
2893
|
745 for (unsigned int i = 0; i < str.length (); i++) |
|
1755
|
746 h = h * 33 + str[i]; |
|
1
|
747 |
|
3013
|
748 return h & (table_size - 1); |
|
2790
|
749 } |
|
|
750 |
|
1
|
751 /* |
|
|
752 ;;; Local Variables: *** |
|
|
753 ;;; mode: C++ *** |
|
|
754 ;;; End: *** |
|
|
755 */ |
