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