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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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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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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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3308
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40 #include "defun.h" |
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1352
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41 #include "error.h" |
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2979
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42 #include "oct-lvalue.h" |
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2975
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43 #include "ov.h" |
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3013
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44 #include "pager.h" |
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1755
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45 #include "symtab.h" |
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1
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46 #include "utils.h" |
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1352
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47 #include "variables.h" |
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48 |
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3308
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49 // Should variables be allowed to hide functions of the same name? A |
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50 // positive value means yes. A negative value means yes, but print a |
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51 // warning message. Zero means it should be considered an error. |
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52 static int Vvariables_can_hide_functions; |
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53 |
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3013
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54 octave_allocator |
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55 symbol_record::symbol_def::allocator (sizeof (symbol_record::symbol_def)); |
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195
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56 |
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3239
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57 void |
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58 symbol_record::symbol_def::dump_symbol_info (void) |
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59 { |
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60 octave_stdout << "symbol_def::count: " << count << "\n"; |
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61 octave_stdout << "def.type_name(): " << definition.type_name () << "\n"; |
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3240
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62 octave_stdout << "def.count(): " << definition.get_count () << "\n"; |
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3239
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63 } |
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64 |
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767
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65 // Individual records in a symbol table. |
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66 |
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3013
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67 // XXX FIXME XXX -- there are lots of places below where we should |
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68 // probably be temporarily ignoring interrupts. |
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1
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69 |
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572
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70 void |
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1755
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71 symbol_record::rename (const string& new_name) |
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572
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72 { |
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2791
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73 if (! read_only_error ("rename")) |
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74 nm = new_name; |
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572
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75 } |
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76 |
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3013
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77 void |
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78 symbol_record::define (const octave_value& v, unsigned int sym_type) |
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195
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79 { |
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3013
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80 if (! (is_variable () && read_only_error ("redefine"))) |
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81 { |
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3258
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82 if (is_function () || is_constant ()) |
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3308
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83 { |
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84 if (Vvariables_can_hide_functions) |
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85 { |
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86 push_def (new symbol_def ()); |
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87 |
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88 if (Vvariables_can_hide_functions < 0) |
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89 warning ("variable `%s' hides function", nm.c_str ()); |
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90 } |
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91 else |
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92 error ("variable `%s' hides function", nm.c_str ()); |
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93 } |
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195
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94 |
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3013
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95 if (definition->type () == symbol_record::BUILTIN_VARIABLE) |
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96 sym_type = symbol_record::BUILTIN_VARIABLE; |
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1
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97 |
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3013
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98 definition->define (v, sym_type); |
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195
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99 } |
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100 } |
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101 |
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102 void |
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103 symbol_record::define_builtin_var (const octave_value& v) |
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195
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104 { |
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3013
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105 define (v, symbol_record::BUILTIN_VARIABLE); |
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195
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106 |
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3013
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107 if (chg_fcn) |
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108 chg_fcn (); |
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1
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109 } |
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110 |
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3013
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111 bool |
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3258
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112 symbol_record::define_builtin_const (const octave_value& v) |
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113 { |
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3013
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114 bool retval = false; |
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115 |
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3258
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116 if (! read_only_error ("redefine")) |
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195
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117 { |
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3258
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118 replace_all_defs (new symbol_def (v, symbol_record::BUILTIN_CONSTANT)); |
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2893
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119 |
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3013
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120 retval = true; |
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1
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121 } |
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122 |
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2893
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123 return retval; |
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2390
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124 } |
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125 |
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3013
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126 bool |
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127 symbol_record::define (octave_function *f, unsigned int sym_type) |
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1
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128 { |
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3013
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129 bool retval = false; |
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130 |
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3013
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131 if (! read_only_error ("redefine")) |
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132 { |
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133 octave_value tmp (f); |
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134 |
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135 replace_all_defs (new symbol_def (tmp, sym_type)); |
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136 |
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137 retval = true; |
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138 } |
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2949
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139 |
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140 return retval; |
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1
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141 } |
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142 |
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143 void |
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195
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144 symbol_record::clear (void) |
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145 { |
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195
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146 if (linked_to_global) |
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1
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147 { |
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3013
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148 if (--definition->count <= 0) |
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149 delete definition; |
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150 |
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151 definition = new symbol_def (); |
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152 |
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195
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153 linked_to_global = 0; |
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1
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154 } |
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2846
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155 else if (! tagged_static) |
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195
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156 { |
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3013
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157 remove_top_def (); |
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158 |
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159 if (! definition) |
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160 definition = new symbol_def (); |
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195
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161 } |
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1
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162 } |
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163 |
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164 void |
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3013
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165 symbol_record::alias (symbol_record *s, bool /* force */) |
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1
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166 { |
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3013
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167 chg_fcn = s->chg_fcn; |
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195
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168 |
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3013
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169 replace_all_defs (s->definition); |
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170 |
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171 definition->count++; |
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172 } |
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173 |
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174 void |
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175 symbol_record::mark_as_formal_parameter (void) |
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176 { |
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3013
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177 if (is_linked_to_global ()) |
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178 error ("can't mark global variable `%s' as function parameter", |
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179 nm.c_str ()); |
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180 else if (is_static ()) |
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181 error ("can't mark static variable `%s' as function paraemter", |
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182 nm.c_str ()); |
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183 else |
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184 formal_param = 1; |
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1
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185 } |
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186 |
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187 void |
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195
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188 symbol_record::mark_as_linked_to_global (void) |
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122
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189 { |
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2975
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190 if (is_formal_parameter ()) |
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191 error ("can't make function parameter `%s' global", nm.c_str ()); |
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192 else if (is_static ()) |
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193 error ("can't make static variable `%s' global", nm.c_str ()); |
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194 else |
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195 linked_to_global = 1; |
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122
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196 } |
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197 |
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2846
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198 void |
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199 symbol_record::mark_as_static (void) |
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200 { |
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201 if (is_linked_to_global ()) |
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202 error ("can't make global variable `%s' static", nm.c_str ()); |
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2846
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203 else if (is_formal_parameter ()) |
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204 error ("can't make formal parameter `%s' static", nm.c_str ()); |
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2846
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205 else |
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206 tagged_static = 1; |
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207 } |
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208 |
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2856
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209 bool |
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3013
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210 symbol_record::hides_fcn (void) const |
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211 { |
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3013
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212 bool retval = false; |
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213 |
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214 if (is_variable () && is_defined ()) |
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215 { |
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216 symbol_def *hidden_def = definition->next_elem; |
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217 |
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3325
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218 if (hidden_def && hidden_def->is_user_function ()) |
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219 retval = true; |
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220 } |
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221 |
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222 return retval; |
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223 } |
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224 |
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225 bool |
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226 symbol_record::hides_builtin (void) const |
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227 { |
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228 bool retval = false; |
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229 |
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230 if (is_variable () && is_defined ()) |
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231 { |
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232 symbol_def *hidden_def = definition->next_elem; |
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233 |
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3325
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234 if (hidden_def && hidden_def->is_builtin_function ()) |
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3013
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235 retval = true; |
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236 } |
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237 |
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238 return retval; |
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2846
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239 } |
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240 |
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2975
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241 octave_value& |
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242 symbol_record::variable_value (void) |
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2390
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243 { |
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2975
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244 static octave_value foo; |
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2390
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245 |
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2975
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246 return is_variable () ? def () : foo; |
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2390
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247 } |
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248 |
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3258
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249 inline void |
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250 symbol_record::link_to_builtin_variable (void) |
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251 { |
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252 symbol_record *tmp_sym = global_sym_tab->lookup (name ()); |
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253 |
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254 if (tmp_sym && tmp_sym->is_builtin_variable ()) |
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255 alias (tmp_sym); |
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256 } |
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257 |
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258 |
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2979
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259 octave_lvalue |
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2390
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260 symbol_record::variable_reference (void) |
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261 { |
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3308
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262 if (Vvariables_can_hide_functions <= 0 |
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263 && (is_function () |
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264 || (! is_defined () && is_valid_function (nm)))) |
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265 { |
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266 if (Vvariables_can_hide_functions < 0) |
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267 warning ("variable `%s' hides function", nm.c_str ()); |
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268 else |
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269 { |
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270 error ("variable `%s' hides function", nm.c_str ()); |
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271 return octave_lvalue (); |
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272 } |
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273 } |
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274 |
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3258
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275 if (is_function () || is_constant ()) |
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2390
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276 clear (); |
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277 |
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278 if (! is_defined ()) |
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279 { |
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280 if (! (is_formal_parameter () || is_linked_to_global ())) |
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3258
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281 link_to_builtin_variable (); |
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2390
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282 |
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283 if (! is_defined ()) |
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2975
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284 { |
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285 octave_value tmp; |
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286 define (tmp); |
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287 } |
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2390
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288 } |
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289 |
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3013
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290 return octave_lvalue (&(def ()), chg_fcn); |
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195
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291 } |
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292 |
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220
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293 void |
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294 symbol_record::push_context (void) |
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295 { |
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2846
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296 if (! is_static ()) |
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297 { |
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298 context.push (definition); |
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3013
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299 |
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300 definition = new symbol_def (); |
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395
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301 |
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2893
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302 global_link_context.push (static_cast<unsigned int> (linked_to_global)); |
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3013
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303 |
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2846
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304 linked_to_global = 0; |
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305 } |
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220
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306 } |
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307 |
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308 void |
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309 symbol_record::pop_context (void) |
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310 { |
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1653
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311 // It is possible for context to be empty if new symbols have been |
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312 // inserted in the symbol table during recursive calls. This can |
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313 // happen as a result of calls to eval() and feval(). |
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220
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314 |
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1653
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315 if (! context.empty ()) |
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220
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316 { |
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3013
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317 replace_all_defs (context.pop ()); |
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1653
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318 |
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319 linked_to_global = global_link_context.pop (); |
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220
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320 } |
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321 } |
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322 |
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3013
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323 void |
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324 symbol_record::print_symbol_info_line (ostream& os) |
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325 { |
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326 os << (is_read_only () ? " r-" : " rw") |
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327 << (is_eternal () ? "-" : "d") |
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328 #if 0 |
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329 << (hides_fcn () ? "f" : (hides_builtin () ? "F" : "-")) |
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330 #endif |
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331 << " " |
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332 << setiosflags (ios::left) << setw (24) << type_name () . c_str (); |
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333 |
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334 os << resetiosflags (ios::left); |
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335 |
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336 int nr = rows (); |
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337 int nc = columns (); |
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338 |
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339 if (nr < 0) |
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340 os << " -"; |
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341 else |
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342 os << setiosflags (ios::right) << setw (7) << nr; |
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343 |
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344 if (nc < 0) |
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345 os << " -"; |
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346 else |
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347 os << setiosflags (ios::right) << setw (7) << nc; |
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348 |
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349 os << resetiosflags (ios::right); |
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350 |
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351 os << " " << name () << "\n"; |
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352 } |
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353 |
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3239
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354 void |
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355 symbol_record::dump_symbol_info (void) |
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356 { |
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357 if (definition) |
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358 definition->dump_symbol_info (); |
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359 else |
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360 octave_stdout << "symbol " << name () << " is undefined\n"; |
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361 } |
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362 |
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3013
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363 bool |
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2791
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364 symbol_record::read_only_error (const char *action) |
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195
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365 { |
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366 if (is_read_only ()) |
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367 { |
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3258
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368 if (is_variable () || is_constant ()) |
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3013
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369 ::error ("can't %s read-only constant `%s'", action, nm.c_str ()); |
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195
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370 else if (is_function ()) |
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3013
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371 ::error ("can't %s read-only function `%s'", action, nm.c_str ()); |
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1045
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372 else |
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3013
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373 ::error ("can't %s read-only symbol `%s'", action, nm.c_str ()); |
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195
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374 |
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3013
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375 return true; |
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195
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376 } |
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377 else |
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3013
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378 return false; |
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195
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379 } |
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380 |
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381 void |
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382 symbol_record::push_def (symbol_def *sd) |
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383 { |
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530
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384 if (! sd) |
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195
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385 return; |
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386 |
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3013
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387 assert (definition == 0 || definition->next_elem == 0); |
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388 |
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195
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389 sd->next_elem = definition; |
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3013
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390 |
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195
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391 definition = sd; |
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392 } |
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393 |
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3013
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394 void |
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395 symbol_record::remove_top_def (void) |
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195
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396 { |
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397 symbol_def *top = definition; |
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398 |
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3013
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399 definition = definition->next_elem; |
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2404
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400 |
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3013
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401 if (--top->count <= 0) |
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402 delete top; |
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195
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403 } |
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404 |
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3013
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405 void |
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406 symbol_record::replace_all_defs (symbol_def *sd) |
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195
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407 { |
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3013
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408 while (definition) |
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409 remove_top_def (); |
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2404
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410 |
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3325
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411 if (! sd) |
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412 sd = new symbol_def (); |
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413 |
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3013
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414 push_def (sd); |
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195
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415 } |
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416 |
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767
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417 // A symbol table. |
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1
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418 |
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419 symbol_record * |
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2856
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420 symbol_table::lookup (const string& nm, bool insert, bool warn) |
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1
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421 { |
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3013
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422 unsigned int index = hash (nm); |
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1
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423 |
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424 symbol_record *ptr = table[index].next (); |
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425 |
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530
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426 while (ptr) |
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1
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427 { |
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1755
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428 if (ptr->name () == nm) |
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1
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429 return ptr; |
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3013
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430 |
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1
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431 ptr = ptr->next (); |
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432 } |
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433 |
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434 if (insert) |
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435 { |
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3013
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436 symbol_record *sr = new symbol_record (nm, table[index].next ()); |
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437 |
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438 table[index].chain (sr); |
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439 |
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440 return sr; |
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1
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441 } |
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442 else if (warn) |
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1755
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443 warning ("lookup: symbol`%s' not found", nm.c_str ()); |
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1
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444 |
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530
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445 return 0; |
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1
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446 } |
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447 |
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448 void |
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1755
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449 symbol_table::rename (const string& old_name, const string& new_name) |
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572
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450 { |
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3013
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451 unsigned int index = hash (old_name); |
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572
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452 |
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453 symbol_record *prev = &table[index]; |
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454 symbol_record *ptr = prev->next (); |
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455 |
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456 while (ptr) |
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457 { |
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1755
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458 if (ptr->name () == old_name) |
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572
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459 { |
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460 ptr->rename (new_name); |
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461 |
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2791
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462 if (! error_state) |
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463 { |
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464 prev->chain (ptr->next ()); |
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465 |
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3013
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466 index = hash (new_name); |
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3125
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467 ptr->chain (table[index].next ()); |
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2791
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468 table[index].chain (ptr); |
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469 |
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470 return; |
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471 } |
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472 |
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473 break; |
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572
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474 } |
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|
475 |
|
|
476 prev = ptr; |
|
|
477 ptr = ptr->next (); |
|
|
478 } |
|
|
479 |
|
1755
|
480 error ("unable to rename `%s' to `%s'", old_name.c_str (), |
|
|
481 new_name.c_str ()); |
|
572
|
482 } |
|
|
483 |
|
|
484 void |
|
2856
|
485 symbol_table::clear (bool clear_user_functions) |
|
1
|
486 { |
|
3013
|
487 for (unsigned int i = 0; i < table_size; i++) |
|
1
|
488 { |
|
169
|
489 symbol_record *ptr = table[i].next (); |
|
1
|
490 |
|
530
|
491 while (ptr) |
|
169
|
492 { |
|
195
|
493 if (ptr->is_user_variable () |
|
3325
|
494 || (clear_user_functions |
|
|
495 && (ptr->is_user_function () || ptr->is_dld_function ()))) |
|
195
|
496 { |
|
|
497 ptr->clear (); |
|
|
498 } |
|
|
499 |
|
169
|
500 ptr = ptr->next (); |
|
1
|
501 } |
|
|
502 } |
|
|
503 } |
|
|
504 |
|
3013
|
505 bool |
|
2856
|
506 symbol_table::clear (const string& nm, bool clear_user_functions) |
|
1
|
507 { |
|
3013
|
508 unsigned int index = hash (nm); |
|
1
|
509 |
|
195
|
510 symbol_record *ptr = table[index].next (); |
|
1
|
511 |
|
530
|
512 while (ptr) |
|
1
|
513 { |
|
1755
|
514 if (ptr->name () == nm |
|
195
|
515 && (ptr->is_user_variable () |
|
3325
|
516 || (clear_user_functions |
|
|
517 && (ptr->is_user_function () || ptr->is_dld_function ())))) |
|
1
|
518 { |
|
195
|
519 ptr->clear (); |
|
3013
|
520 return true; |
|
1
|
521 } |
|
195
|
522 ptr = ptr->next (); |
|
1
|
523 } |
|
|
524 |
|
3013
|
525 return false; |
|
1
|
526 } |
|
|
527 |
|
|
528 int |
|
164
|
529 symbol_table::size (void) const |
|
1
|
530 { |
|
|
531 int count = 0; |
|
3013
|
532 |
|
|
533 for (unsigned int i = 0; i < table_size; i++) |
|
1
|
534 { |
|
|
535 symbol_record *ptr = table[i].next (); |
|
3013
|
536 |
|
530
|
537 while (ptr) |
|
1
|
538 { |
|
|
539 count++; |
|
|
540 ptr = ptr->next (); |
|
|
541 } |
|
|
542 } |
|
3013
|
543 |
|
1
|
544 return count; |
|
|
545 } |
|
|
546 |
|
3013
|
547 static bool |
|
|
548 matches_patterns (const string& name, const string_vector& pats) |
|
1
|
549 { |
|
3013
|
550 int npats = pats.length (); |
|
1
|
551 |
|
3013
|
552 if (npats == 0) |
|
|
553 return true; |
|
|
554 |
|
|
555 glob_match pattern (pats); |
|
|
556 |
|
|
557 return pattern.match (name); |
|
1
|
558 } |
|
|
559 |
|
3013
|
560 Array<symbol_record *> |
|
|
561 symbol_table::symbol_list (int& count, const string_vector& pats, |
|
|
562 unsigned int type, unsigned int scope) const |
|
1
|
563 { |
|
115
|
564 count = 0; |
|
3013
|
565 |
|
1
|
566 int n = size (); |
|
3013
|
567 |
|
1
|
568 if (n == 0) |
|
530
|
569 return 0; |
|
1
|
570 |
|
3013
|
571 Array<symbol_record *> symbols (n); |
|
|
572 |
|
|
573 for (unsigned int i = 0; i < table_size; i++) |
|
1
|
574 { |
|
|
575 symbol_record *ptr = table[i].next (); |
|
3013
|
576 |
|
530
|
577 while (ptr) |
|
1
|
578 { |
|
|
579 assert (count < n); |
|
867
|
580 |
|
2893
|
581 unsigned int my_scope = ptr->is_linked_to_global () + 1; // Tricky... |
|
867
|
582 |
|
2893
|
583 unsigned int my_type = ptr->type (); |
|
867
|
584 |
|
1755
|
585 string my_name = ptr->name (); |
|
867
|
586 |
|
|
587 if ((type & my_type) && (scope & my_scope) |
|
3013
|
588 && matches_patterns (my_name, pats)) |
|
|
589 symbols(count++) = ptr; |
|
605
|
590 |
|
1
|
591 ptr = ptr->next (); |
|
|
592 } |
|
|
593 } |
|
1755
|
594 |
|
|
595 symbols.resize (count); |
|
1
|
596 |
|
3013
|
597 return symbols; |
|
|
598 } |
|
|
599 |
|
|
600 string_vector |
|
|
601 symbol_table::name_list (int& count, const string_vector& pats, bool sort, |
|
|
602 unsigned int type, unsigned int scope) const |
|
|
603 { |
|
|
604 Array<symbol_record *> symbols |
|
|
605 = symbol_list (count, pats, type, scope); |
|
|
606 |
|
|
607 string_vector names; |
|
|
608 |
|
|
609 int n = symbols.length (); |
|
|
610 |
|
|
611 if (n > 0) |
|
|
612 { |
|
|
613 names.resize (n); |
|
|
614 |
|
|
615 for (int i = 0; i < n; i++) |
|
|
616 names[i] = symbols(i)->name (); |
|
|
617 } |
|
|
618 |
|
|
619 if (sort) |
|
|
620 names.qsort (); |
|
|
621 |
|
|
622 return names; |
|
|
623 } |
|
|
624 |
|
|
625 static int |
|
3145
|
626 maybe_list_cmp_fcn (const void *a_arg, const void *b_arg) |
|
3013
|
627 { |
|
3145
|
628 const symbol_record *a = *(X_CAST (const symbol_record **, a_arg)); |
|
|
629 const symbol_record *b = *(X_CAST (const symbol_record **, b_arg)); |
|
3013
|
630 |
|
3145
|
631 string a_nm = a->name (); |
|
|
632 string b_nm = b->name (); |
|
|
633 |
|
|
634 return a_nm.compare (b_nm); |
|
3013
|
635 } |
|
1
|
636 |
|
3013
|
637 int |
|
|
638 symbol_table::maybe_list (const char *header, const string_vector& argv, |
|
|
639 ostream& os, bool show_verbose, |
|
|
640 unsigned type, unsigned scope) |
|
|
641 { |
|
|
642 int count; |
|
|
643 |
|
|
644 int status = 0; |
|
|
645 |
|
|
646 if (show_verbose) |
|
|
647 { |
|
|
648 Array<symbol_record *> symbols = symbol_list (count, argv, type, scope); |
|
|
649 |
|
|
650 int len = symbols.length (); |
|
|
651 |
|
|
652 if (len > 0 && count > 0) |
|
|
653 { |
|
|
654 os << "\n" << header << "\n\n" |
|
|
655 << "prot type rows cols name\n" |
|
|
656 << "==== ==== ==== ==== ====\n"; |
|
|
657 |
|
|
658 symbols.qsort (maybe_list_cmp_fcn); |
|
|
659 |
|
|
660 for (int i = 0; i < len; i++) |
|
|
661 symbols(i)->print_symbol_info_line (os); |
|
|
662 |
|
|
663 status = 1; |
|
|
664 } |
|
|
665 } |
|
|
666 else |
|
|
667 { |
|
|
668 string_vector symbols = name_list (count, argv, 1, type, scope); |
|
|
669 |
|
|
670 if (symbols.length () > 0 && count > 0) |
|
|
671 { |
|
|
672 os << "\n" << header << "\n\n"; |
|
|
673 |
|
|
674 symbols.list_in_columns (os); |
|
|
675 |
|
|
676 status = 1; |
|
|
677 } |
|
|
678 } |
|
|
679 |
|
|
680 return status; |
|
1
|
681 } |
|
|
682 |
|
605
|
683 symbol_record ** |
|
2893
|
684 symbol_table::glob (int& count, const string& pat, unsigned int type, |
|
|
685 unsigned int scope) const |
|
605
|
686 { |
|
|
687 count = 0; |
|
|
688 int n = size (); |
|
|
689 if (n == 0) |
|
|
690 return 0; |
|
|
691 |
|
|
692 symbol_record **symbols = new symbol_record * [n+1]; |
|
3013
|
693 |
|
|
694 for (unsigned int i = 0; i < table_size; i++) |
|
605
|
695 { |
|
|
696 symbol_record *ptr = table[i].next (); |
|
3013
|
697 |
|
605
|
698 while (ptr) |
|
|
699 { |
|
|
700 assert (count < n); |
|
|
701 |
|
2893
|
702 unsigned int my_scope = ptr->is_linked_to_global () + 1; // Tricky... |
|
605
|
703 |
|
2893
|
704 unsigned int my_type = ptr->type (); |
|
605
|
705 |
|
1792
|
706 glob_match pattern (pat); |
|
1755
|
707 |
|
605
|
708 if ((type & my_type) && (scope & my_scope) |
|
1792
|
709 && pattern.match (ptr->name ())) |
|
605
|
710 { |
|
|
711 symbols[count++] = ptr; |
|
|
712 } |
|
|
713 |
|
|
714 ptr = ptr->next (); |
|
|
715 } |
|
|
716 } |
|
|
717 symbols[count] = 0; |
|
|
718 |
|
|
719 return symbols; |
|
|
720 } |
|
|
721 |
|
220
|
722 void |
|
|
723 symbol_table::push_context (void) |
|
|
724 { |
|
3013
|
725 for (unsigned int i = 0; i < table_size; i++) |
|
220
|
726 { |
|
|
727 symbol_record *ptr = table[i].next (); |
|
|
728 |
|
530
|
729 while (ptr) |
|
220
|
730 { |
|
|
731 ptr->push_context (); |
|
|
732 ptr = ptr->next (); |
|
|
733 } |
|
|
734 } |
|
|
735 } |
|
|
736 |
|
|
737 void |
|
|
738 symbol_table::pop_context (void) |
|
|
739 { |
|
3013
|
740 for (unsigned int i = 0; i < table_size; i++) |
|
220
|
741 { |
|
|
742 symbol_record *ptr = table[i].next (); |
|
|
743 |
|
530
|
744 while (ptr) |
|
220
|
745 { |
|
|
746 ptr->pop_context (); |
|
|
747 ptr = ptr->next (); |
|
|
748 } |
|
|
749 } |
|
|
750 } |
|
|
751 |
|
3013
|
752 void |
|
|
753 symbol_table::print_stats (void) |
|
|
754 { |
|
|
755 int count = 0; |
|
|
756 int empty_chains = 0; |
|
|
757 int max_chain_length = 0; |
|
|
758 int min_chain_length = INT_MAX; |
|
|
759 |
|
|
760 for (unsigned int i = 0; i < table_size; i++) |
|
|
761 { |
|
|
762 int num_this_chain = 0; |
|
|
763 |
|
|
764 symbol_record *ptr = table[i].next (); |
|
|
765 |
|
|
766 if (ptr) |
|
|
767 octave_stdout << "chain number " << i << ":\n"; |
|
|
768 else |
|
|
769 { |
|
|
770 empty_chains++; |
|
|
771 min_chain_length = 0; |
|
|
772 } |
|
|
773 |
|
|
774 while (ptr) |
|
|
775 { |
|
|
776 num_this_chain++; |
|
|
777 |
|
|
778 octave_stdout << " " << ptr->name () << "\n"; |
|
|
779 |
|
|
780 ptr = ptr->next (); |
|
|
781 } |
|
|
782 |
|
|
783 count += num_this_chain; |
|
|
784 |
|
|
785 if (num_this_chain > max_chain_length) |
|
|
786 max_chain_length = num_this_chain; |
|
|
787 |
|
|
788 if (num_this_chain < min_chain_length) |
|
|
789 min_chain_length = num_this_chain; |
|
|
790 |
|
|
791 if (num_this_chain > 0) |
|
|
792 octave_stdout << "\n"; |
|
|
793 } |
|
|
794 |
|
|
795 octave_stdout << "max chain length: " << max_chain_length << "\n"; |
|
|
796 octave_stdout << "min chain length: " << min_chain_length << "\n"; |
|
|
797 octave_stdout << "empty chains: " << empty_chains << "\n"; |
|
|
798 octave_stdout << "total chains: " << table_size << "\n"; |
|
|
799 octave_stdout << "total symbols: " << count << "\n"; |
|
|
800 } |
|
|
801 |
|
1
|
802 // Chris Torek's fave hash function. |
|
|
803 |
|
|
804 unsigned int |
|
1755
|
805 symbol_table::hash (const string& str) |
|
1
|
806 { |
|
2893
|
807 unsigned int h = 0; |
|
3013
|
808 |
|
2893
|
809 for (unsigned int i = 0; i < str.length (); i++) |
|
1755
|
810 h = h * 33 + str[i]; |
|
1
|
811 |
|
3013
|
812 return h & (table_size - 1); |
|
2790
|
813 } |
|
|
814 |
|
3308
|
815 |
|
|
816 static int |
|
|
817 variables_can_hide_functions (void) |
|
|
818 { |
|
|
819 Vvariables_can_hide_functions |
|
|
820 = check_preference ("variables_can_hide_functions"); |
|
|
821 |
|
|
822 return 0; |
|
|
823 } |
|
|
824 |
|
|
825 void |
|
|
826 symbols_of_symtab (void) |
|
|
827 { |
|
|
828 DEFVAR (variables_can_hide_functions, 1.0, variables_can_hide_functions, |
|
|
829 "Should variables be allowed to hide functions of the same name?"); |
|
|
830 } |
|
|
831 |
|
|
832 |
|
1
|
833 /* |
|
|
834 ;;; Local Variables: *** |
|
|
835 ;;; mode: C++ *** |
|
|
836 ;;; End: *** |
|
|
837 */ |
