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