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