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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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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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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include "str-vec.h" |
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32 |
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33 #include <defaults.h> |
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34 #include "defun.h" |
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35 #include "error.h" |
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36 #include "input.h" |
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37 #include "oct-obj.h" |
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38 #include "ov-usr-fcn.h" |
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39 #include "ov.h" |
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40 #include "pager.h" |
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2985
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41 #include "pt-jump.h" |
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2974
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42 #include "pt-misc.h" |
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43 #include "pt-pr-code.h" |
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2982
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44 #include "pt-stmt.h" |
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2974
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45 #include "pt-walk.h" |
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46 #include "symtab.h" |
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47 #include "toplev.h" |
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48 #include "unwind-prot.h" |
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49 #include "utils.h" |
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50 #include "variables.h" |
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51 |
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52 // If TRUE, variables returned from functions have default values even |
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53 // if they are not explicitly initialized. |
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54 static bool Vdefine_all_return_values; |
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55 |
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3131
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56 // Maximum nesting level for functions called recursively. |
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57 static int Vmax_recursion_depth; |
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58 |
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2974
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59 // If TRUE, the last computed value is returned from functions that |
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60 // don't actually define any return variables. |
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61 static bool Vreturn_last_computed_value; |
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62 |
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63 // User defined functions. |
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64 |
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3219
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65 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
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2974
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66 |
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3219
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67 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
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68 "user-defined function"); |
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69 |
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70 // Ugh. This really needs to be simplified (code/data? |
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71 // extrinsic/intrinsic state?). |
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72 |
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73 octave_user_function::octave_user_function |
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74 (tree_parameter_list *pl, tree_parameter_list *rl, |
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75 tree_statement_list *cl, symbol_table *st) |
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76 : octave_function (string (), string ()), |
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77 param_list (pl), ret_list (rl), cmd_list (cl), |
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78 sym_tab (st), file_name (), fcn_name (), t_parsed (0), |
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3165
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79 t_checked (0), system_fcn_file (false), call_depth (0), |
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80 num_named_args (0), args_passed (), num_args_passed (0), |
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81 curr_va_arg_number (0), vr_list (0), symtab_entry (0), |
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82 argn_sr (0), nargin_sr (0), nargout_sr (0) |
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83 { |
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84 install_automatic_vars (); |
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85 |
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86 if (param_list) |
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87 { |
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88 num_named_args = param_list->length (); |
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89 curr_va_arg_number = num_named_args; |
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90 } |
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91 } |
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92 |
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93 octave_user_function::~octave_user_function (void) |
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94 { |
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95 delete param_list; |
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96 delete ret_list; |
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97 delete sym_tab; |
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98 delete cmd_list; |
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99 delete vr_list; |
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100 } |
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101 |
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102 octave_user_function * |
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103 octave_user_function::define_ret_list (tree_parameter_list *t) |
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104 { |
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105 ret_list = t; |
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106 |
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107 if (ret_list && ret_list->takes_varargs ()) |
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108 vr_list = new tree_va_return_list; |
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109 |
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110 return this; |
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111 } |
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112 |
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113 void |
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114 octave_user_function::stash_fcn_file_name (void) |
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115 { |
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116 if (fcn_name.empty ()) |
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117 file_name = ""; |
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118 else |
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119 file_name = fcn_file_in_path (fcn_name); |
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120 } |
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121 |
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122 void |
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123 octave_user_function::mark_as_system_fcn_file (void) |
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124 { |
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125 if (! file_name.empty ()) |
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126 { |
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127 // We really should stash the whole path to the file we found, |
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128 // when we looked it up, to avoid possible race conditions... |
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129 // XXX FIXME XXX |
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130 // |
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131 // We probably also don't need to get the library directory |
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132 // every time, but since this function is only called when the |
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133 // function file is parsed, it probably doesn't matter that |
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134 // much. |
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135 |
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136 string ff_name = fcn_file_in_path (file_name); |
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137 |
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138 if (Vfcn_file_dir.compare (ff_name, 0, Vfcn_file_dir.length ()) == 0) |
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139 system_fcn_file = 1; |
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140 } |
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141 else |
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142 system_fcn_file = 0; |
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143 } |
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144 |
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145 bool |
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146 octave_user_function::takes_varargs (void) const |
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147 { |
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148 return (param_list && param_list->takes_varargs ()); |
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149 } |
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150 |
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151 octave_value |
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152 octave_user_function::octave_va_arg (void) |
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153 { |
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154 octave_value retval; |
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155 |
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156 if (curr_va_arg_number < num_args_passed) |
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157 retval = args_passed (curr_va_arg_number++); |
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158 else |
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159 ::error ("va_arg: error getting arg number %d -- only %d provided", |
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160 curr_va_arg_number + 1, num_args_passed); |
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161 |
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162 return retval; |
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163 } |
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164 |
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165 octave_value_list |
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166 octave_user_function::octave_all_va_args (void) |
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167 { |
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168 octave_value_list retval; |
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169 |
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3178
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170 int n = num_args_passed - num_named_args; |
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2974
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171 |
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3178
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172 if (n > 0) |
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173 { |
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174 retval.resize (n); |
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175 |
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176 int k = 0; |
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177 for (int i = num_named_args; i < num_args_passed; i++) |
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178 retval(k++) = args_passed(i); |
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179 } |
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180 |
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181 return retval; |
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182 } |
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183 |
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184 bool |
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185 octave_user_function::takes_var_return (void) const |
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186 { |
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187 return (ret_list && ret_list->takes_varargs ()); |
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188 } |
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189 |
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190 void |
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191 octave_user_function::octave_vr_val (const octave_value& val) |
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192 { |
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193 assert (vr_list); |
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194 |
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195 vr_list->append (val); |
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196 } |
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197 |
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198 void |
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199 octave_user_function::stash_function_name (const string& s) |
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200 { |
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201 fcn_name = s; |
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202 } |
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203 |
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204 // For unwind protect. |
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205 |
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206 static void |
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207 pop_symbol_table_context (void *table) |
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208 { |
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209 symbol_table *tmp = static_cast<symbol_table *> (table); |
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210 tmp->pop_context (); |
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211 } |
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212 |
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213 static void |
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214 delete_vr_list (void *list) |
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215 { |
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216 tree_va_return_list *tmp = static_cast<tree_va_return_list *> (list); |
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217 tmp->clear (); |
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218 delete tmp; |
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219 } |
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220 |
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221 static void |
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222 clear_symbol_table (void *table) |
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223 { |
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224 symbol_table *tmp = static_cast<symbol_table *> (table); |
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225 tmp->clear (); |
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226 } |
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227 |
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228 static void |
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229 unprotect_function (void *sr_arg) |
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230 { |
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231 symbol_record *sr = static_cast<symbol_record *> (sr_arg); |
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232 sr->unprotect (); |
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233 } |
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234 |
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235 octave_value_list |
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236 octave_user_function::do_index_op (int nargout, const octave_value_list& args) |
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237 { |
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238 octave_value_list retval; |
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239 |
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240 if (error_state) |
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241 return retval; |
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242 |
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243 if (! cmd_list) |
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244 return retval; |
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245 |
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246 int nargin = args.length (); |
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247 |
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2985
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248 unwind_protect::begin_frame ("func_eval"); |
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2974
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249 |
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250 unwind_protect_int (call_depth); |
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251 call_depth++; |
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252 |
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3131
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253 if (call_depth > Vmax_recursion_depth) |
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254 { |
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255 ::error ("max_recursion_limit exceeded"); |
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256 return retval; |
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257 } |
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258 |
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2974
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259 if (symtab_entry && ! symtab_entry->is_read_only ()) |
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260 { |
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261 symtab_entry->protect (); |
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2985
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262 unwind_protect::add (unprotect_function, symtab_entry); |
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2974
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263 } |
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264 |
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265 if (call_depth > 1) |
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266 { |
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267 sym_tab->push_context (); |
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2985
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268 unwind_protect::add (pop_symbol_table_context, sym_tab); |
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269 |
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270 if (vr_list) |
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271 { |
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272 // Push new vr_list. |
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273 |
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274 unwind_protect_ptr (vr_list); |
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275 vr_list = new tree_va_return_list; |
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276 |
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277 // Clear and delete the new one before restoring the old |
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278 // one. |
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279 |
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2985
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280 unwind_protect::add (delete_vr_list, vr_list); |
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2974
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281 } |
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282 } |
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283 |
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284 if (vr_list) |
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285 vr_list->clear (); |
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286 |
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287 // Force symbols to be undefined again when this function exits. |
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288 |
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2985
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289 unwind_protect::add (clear_symbol_table, sym_tab); |
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290 |
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291 // Save old and set current symbol table context, for |
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292 // eval_undefined_error(). |
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293 |
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294 unwind_protect_ptr (curr_sym_tab); |
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295 curr_sym_tab = sym_tab; |
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296 |
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297 unwind_protect_ptr (curr_function); |
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298 curr_function = this; |
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299 |
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300 // XXX FIXME XXX -- ??? |
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301 // unwind_protect_ptr (args_passed); |
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302 |
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303 args_passed = args; |
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304 |
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305 string_vector arg_names = args.name_tags (); |
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306 |
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307 unwind_protect_int (num_args_passed); |
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308 num_args_passed = nargin; |
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309 |
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310 unwind_protect_int (num_named_args); |
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311 unwind_protect_int (curr_va_arg_number); |
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312 |
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313 if (param_list && ! param_list->varargs_only ()) |
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314 { |
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315 param_list->define_from_arg_vector (args); |
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316 if (error_state) |
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317 goto abort; |
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318 } |
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319 |
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320 if (ret_list && Vdefine_all_return_values) |
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321 { |
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322 octave_value tmp = builtin_any_variable ("default_return_value"); |
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323 |
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324 if (tmp.is_defined ()) |
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325 ret_list->initialize_undefined_elements (tmp); |
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326 } |
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327 |
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328 // The following code is in a separate scope to avoid warnings from |
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329 // G++ about `goto abort' crossing the initialization of some |
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330 // variables. |
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331 |
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332 { |
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333 bind_automatic_vars (arg_names, nargin, nargout); |
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334 |
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335 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); |
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336 |
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337 if (echo_commands) |
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338 print_code_function_header (); |
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339 |
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340 // Evaluate the commands that make up the function. |
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341 |
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342 octave_value_list tmp = cmd_list->eval (); |
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343 |
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344 octave_value last_computed_value; |
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345 |
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346 if (! tmp.empty ()) |
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347 last_computed_value = tmp(0); |
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348 |
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349 if (echo_commands) |
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350 print_code_function_trailer (); |
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351 |
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2985
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352 if (tree_return_command::returning) |
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353 tree_return_command::returning = 0; |
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2974
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354 |
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2985
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355 if (tree_break_command::breaking) |
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356 tree_break_command::breaking--; |
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2974
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357 |
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358 if (error_state) |
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359 { |
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360 traceback_error (); |
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361 goto abort; |
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362 } |
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363 |
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364 // Copy return values out. |
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365 |
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366 if (ret_list) |
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367 retval = ret_list->convert_to_const_vector (vr_list); |
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368 else if (Vreturn_last_computed_value) |
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369 retval(0) = last_computed_value; |
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370 } |
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371 |
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372 abort: |
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2985
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373 unwind_protect::run_frame ("func_eval"); |
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2974
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374 |
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375 return retval; |
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376 } |
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377 |
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378 void |
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379 octave_user_function::traceback_error (void) |
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380 { |
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381 if (error_state >= 0) |
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382 error_state = -1; |
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383 |
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384 if (fcn_name.empty ()) |
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385 { |
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386 if (file_name.empty ()) |
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387 ::error ("called from `?unknown?'"); |
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388 else |
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389 ::error ("called from file `%s'", file_name.c_str ()); |
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390 } |
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391 else |
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392 { |
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393 if (file_name.empty ()) |
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394 ::error ("called from `%s'", fcn_name.c_str ()); |
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395 else |
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396 ::error ("called from `%s' in file `%s'", |
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397 fcn_name.c_str (), file_name.c_str ()); |
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398 } |
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399 } |
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400 |
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401 void |
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402 octave_user_function::accept (tree_walker& tw) |
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403 { |
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404 tw.visit_octave_user_function (*this); |
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405 } |
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406 |
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407 void |
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408 octave_user_function::print_code_function_header (void) |
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409 { |
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410 tree_print_code tpc (octave_stdout, Vps4); |
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411 |
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412 tpc.visit_octave_user_function_header (*this); |
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413 } |
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414 |
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415 void |
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416 octave_user_function::print_code_function_trailer (void) |
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417 { |
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418 tree_print_code tpc (octave_stdout, Vps4); |
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419 |
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420 tpc.visit_octave_user_function_trailer (*this); |
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421 } |
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422 |
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423 void |
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424 octave_user_function::install_automatic_vars (void) |
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425 { |
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426 argn_sr = sym_tab->lookup ("argn", true); |
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427 nargin_sr = sym_tab->lookup ("nargin", true); |
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428 nargout_sr = sym_tab->lookup ("nargout", true); |
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429 } |
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430 |
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431 void |
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432 octave_user_function::bind_automatic_vars |
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433 (const string_vector& arg_names, int nargin, int nargout) |
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434 { |
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435 if (! arg_names.empty ()) |
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436 argn_sr->define (arg_names); |
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437 |
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438 nargin_sr->define (static_cast<double> (nargin)); |
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439 nargout_sr->define (static_cast<double> (nargout)); |
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440 } |
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441 |
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442 DEFUN (va_arg, args, , |
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443 "va_arg (): return next argument in a function that takes a\n\ |
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444 variable number of parameters") |
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445 { |
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446 octave_value_list retval; |
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447 |
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448 int nargin = args.length (); |
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449 |
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450 if (nargin == 0) |
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451 { |
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452 if (curr_function) |
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453 { |
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454 if (curr_function->takes_varargs ()) |
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455 retval = curr_function->octave_va_arg (); |
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456 else |
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457 { |
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458 ::error ("va_arg only valid within function taking variable"); |
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459 ::error ("number of arguments"); |
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460 } |
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461 } |
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462 else |
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463 ::error ("va_arg only valid within function body"); |
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464 } |
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465 else |
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466 print_usage ("va_arg"); |
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467 |
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468 return retval; |
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469 } |
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470 |
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471 DEFUN (va_start, args, , |
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472 "va_start (): reset the pointer to the list of optional arguments\n\ |
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473 to the beginning") |
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474 { |
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475 octave_value_list retval; |
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476 |
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477 int nargin = args.length (); |
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478 |
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479 if (nargin == 0) |
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480 { |
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481 if (curr_function) |
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482 { |
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483 if (curr_function->takes_varargs ()) |
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484 curr_function->octave_va_start (); |
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485 else |
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486 { |
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487 ::error ("va_start only valid within function taking variable"); |
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488 ::error ("number of arguments"); |
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489 } |
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490 } |
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491 else |
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492 ::error ("va_start only valid within function body"); |
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493 } |
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494 else |
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495 print_usage ("va_start"); |
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496 |
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497 return retval; |
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|
498 } |
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499 |
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500 DEFUN (vr_val, args, , |
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501 "vr_val (X): append X to the list of optional return values for a\n\ |
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502 function that allows a variable number of return values") |
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503 { |
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504 octave_value_list retval; |
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505 |
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|
506 int nargin = args.length (); |
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|
507 |
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|
508 if (nargin == 1) |
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509 { |
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510 if (curr_function) |
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|
511 { |
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512 if (curr_function->takes_var_return ()) |
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513 curr_function->octave_vr_val (args(0)); |
|
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514 else |
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515 { |
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|
516 ::error ("vr_val only valid within function declared to"); |
|
|
517 ::error ("produce a variable number of values"); |
|
|
518 } |
|
|
519 } |
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|
520 else |
|
|
521 ::error ("vr_val only valid within function body"); |
|
|
522 } |
|
|
523 else |
|
|
524 print_usage ("vr_val"); |
|
|
525 |
|
|
526 return retval; |
|
|
527 } |
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|
528 |
|
|
529 static int |
|
|
530 define_all_return_values (void) |
|
|
531 { |
|
|
532 Vdefine_all_return_values = check_preference ("define_all_return_values"); |
|
|
533 |
|
|
534 return 0; |
|
|
535 } |
|
|
536 |
|
|
537 static int |
|
3131
|
538 max_recursion_depth (void) |
|
|
539 { |
|
|
540 Vmax_recursion_depth = check_preference ("max_recursion_depth"); |
|
|
541 |
|
|
542 return 0; |
|
|
543 } |
|
|
544 |
|
|
545 static int |
|
2974
|
546 return_last_computed_value (void) |
|
|
547 { |
|
|
548 Vreturn_last_computed_value |
|
|
549 = check_preference ("return_last_computed_value"); |
|
|
550 |
|
|
551 return 0; |
|
|
552 } |
|
|
553 |
|
|
554 void |
|
|
555 symbols_of_ov_usr_fcn (void) |
|
|
556 { |
|
|
557 DEFVAR (default_return_value, Matrix (), 0, 0, |
|
|
558 "the default for value for unitialized variables returned from\n\ |
|
|
559 functions. Only used if the variable initialize_return_values is\n\ |
|
3156
|
560 nonzero."); |
|
2974
|
561 |
|
|
562 DEFVAR (define_all_return_values, 0.0, 0, define_all_return_values, |
|
|
563 "control whether values returned from functions should have a\n\ |
|
|
564 value even if one has not been explicitly assigned. See also\n\ |
|
|
565 default_return_value"); |
|
|
566 |
|
3131
|
567 DEFVAR (max_recursion_depth, 256.0, 0, max_recursion_depth, |
|
|
568 "maximum nesting level for functions called recursively.\n\ |
|
|
569 The default value is 256."); |
|
|
570 |
|
2974
|
571 DEFVAR (return_last_computed_value, 0.0, 0, return_last_computed_value, |
|
|
572 "if a function does not return any values explicitly, return the\n\ |
|
|
573 last computed value"); |
|
|
574 } |
|
|
575 |
|
|
576 /* |
|
|
577 ;;; Local Variables: *** |
|
|
578 ;;; mode: C++ *** |
|
|
579 ;;; End: *** |
|
|
580 */ |
