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1 // Symbol table classes. -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #if !defined (_symtab_h) |
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25 #define _symtab_h 1 |
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26 |
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27 #ifdef __GNUG__ |
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28 #pragma interface |
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29 #endif |
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30 |
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31 #include <stdlib.h> |
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32 #include <string.h> |
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33 #include <iostream.h> |
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34 #include <assert.h> |
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35 |
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36 #ifndef SV_FUNCTION_TYPEDEFS |
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37 #define SV_FUNCTION_TYPEDEFS 1 |
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38 |
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39 typedef int (*sv_Function)(void); |
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40 |
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41 #endif |
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42 |
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43 #define HASH_TABLE_SIZE 1024 /* Must be multiple of 2 */ |
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44 #define HASH_MASK (HASH_TABLE_SIZE - 1) |
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45 |
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46 class tree; |
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47 class tree_builtin; |
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48 class tree_constant; |
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49 class tree_function; |
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50 |
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51 class symbol_def; |
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52 class symbol_record; |
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53 class symbol_table; |
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54 |
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55 /* |
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56 * Variables or functions. |
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57 */ |
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58 class symbol_def |
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59 { |
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60 friend class symbol_record; |
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61 |
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62 public: |
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63 |
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64 enum symbol_type |
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65 { |
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66 unknown_type, |
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67 variable, |
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68 builtin_function, |
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69 user_function, |
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70 }; |
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71 |
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72 enum symbol_lifespan |
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73 { |
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74 temporary, |
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75 eternal, |
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76 }; |
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77 |
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78 enum symbol_class |
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79 { |
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80 read_write, |
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81 read_only, |
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82 }; |
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83 |
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84 symbol_def (void); |
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85 symbol_def (tree_constant *t); |
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86 symbol_def (tree_builtin *t); |
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87 symbol_def (tree_function *t); |
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88 |
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89 ~symbol_def (void); |
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90 |
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91 void define (tree_constant *t); |
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92 void define (tree_builtin *t); |
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93 void define (tree_function *t); |
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94 |
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95 tree *def (void) const; |
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96 char *help (void) const; |
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97 void document (const char *h); |
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98 |
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99 int save (ostream& os, int mark_as_global); |
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100 |
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101 private: |
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102 |
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103 char *help_string; |
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104 symbol_lifespan lifespan; |
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105 symbol_class sym_class; |
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106 symbol_type type; |
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107 tree *definition; |
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108 int count; |
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109 int preserve; |
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110 |
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111 symbol_def (const symbol_def& sd); |
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112 symbol_def& operator = (const symbol_def& sd); |
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113 }; |
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114 |
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115 /* |
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116 * Individual records in a symbol table. |
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117 */ |
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118 class |
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119 symbol_record |
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120 { |
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121 friend class symbol_table; |
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122 |
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123 public: |
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124 symbol_record (void); |
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125 symbol_record (const char *n); |
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126 symbol_record (const char *n, symbol_record *nxt); |
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127 |
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128 ~symbol_record (void); |
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129 |
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130 char *name (void) const; |
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131 char *help (void) const; |
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132 tree *def (void) const; |
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133 |
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164
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134 int is_function (void) const; |
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135 int is_variable (void) const; |
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136 |
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164
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137 int is_defined (void) const; |
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138 |
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139 void set_sv_function (sv_Function f); |
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140 |
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141 int var_read_only (void); |
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142 int read_only (void); |
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143 |
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144 int define (tree_constant *t); |
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145 int define (tree_builtin *t); |
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146 int define (tree_function *t); |
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147 int define_as_fcn (tree_constant *t); |
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148 |
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164
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149 void document (const char *h); |
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150 |
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151 void protect (void); |
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152 void unprotect (void); |
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153 void make_eternal (void); |
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154 |
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155 int save (ostream& os, int mark_as_global = 0); |
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156 |
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186
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157 int clear_visible (void); |
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158 void clear_all (void); |
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159 |
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160 void mark_as_formal_parameter (void); |
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164
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161 int is_formal_parameter (void) const; |
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162 |
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121
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163 void mark_as_forced_global (void); |
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164
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164 int is_forced_global (void) const; |
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165 |
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166 void alias (symbol_record *s, int force = 0); |
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167 |
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164
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168 symbol_record *next (void) const; |
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169 |
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170 private: |
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171 |
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172 char *nm; |
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173 int formal_param; |
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121
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174 int forced_global; |
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175 symbol_def *var; |
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176 symbol_def *fcn; |
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177 sv_Function sv_fcn; |
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178 symbol_record *next_elem; |
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179 |
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186
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180 symbol_record (const symbol_record& s) { assert (0); } |
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181 symbol_record& operator = (const symbol_record& s); |
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182 }; |
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183 |
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184 /* |
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185 * A symbol table. |
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186 */ |
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187 class |
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188 symbol_table |
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189 { |
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190 public: |
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191 |
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192 symbol_table (void); |
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193 |
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194 symbol_record *lookup (const char *nm, int insert = 0, int warn = 0); |
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195 |
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196 void clear (void); |
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164
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197 int clear (const char *nm); |
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198 |
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199 void bind_globals (void); |
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200 |
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201 int save (ostream& os, int mark_as_global = 0); |
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202 int save (ostream& os, const char *name, int mark_as_global = 0); |
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203 |
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164
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204 int size (void) const; |
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205 |
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164
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206 char **list (void) const; |
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207 char **var_list (void) const; |
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208 char **fcn_list (void) const; |
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209 |
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210 char **list (int& count) const; |
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211 char **var_list (int& count) const; |
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212 char **fcn_list (int& count) const; |
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213 |
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214 char **sorted_list (void) const; |
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215 char **sorted_var_list (void) const; |
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216 char **sorted_fcn_list (void) const; |
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217 |
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218 char **sorted_list (int& count) const; |
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219 char **sorted_var_list (int& count) const; |
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220 char **sorted_fcn_list (int& count) const; |
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221 |
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222 private: |
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223 |
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224 unsigned int hash (const char *s); |
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225 |
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226 symbol_record table[HASH_TABLE_SIZE]; |
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227 }; |
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228 |
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229 #endif |
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230 |
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231 /* |
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232 ;;; Local Variables: *** |
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233 ;;; mode: C++ *** |
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234 ;;; page-delimiter: "^/\\*" *** |
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235 ;;; End: *** |
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236 */ |
