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