Mercurial > octave-dspies
annotate src/ov-usr-fcn.cc @ 8011:3100283874d7
improve backtrace error messages
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Tue, 05 Aug 2008 23:09:32 -0400 |
| parents | 0d607e8dbbfa |
| children | b3e667f1ab4c |
| rev | line source |
|---|---|
| 2974 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, |
| 4 2006, 2007 John W. Eaton | |
| 2974 | 5 |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 2974 | 12 |
| 13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 2974 | 21 |
| 22 */ | |
| 23 | |
| 24 #ifdef HAVE_CONFIG_H | |
| 25 #include <config.h> | |
| 26 #endif | |
| 27 | |
| 28 #include "str-vec.h" | |
| 29 | |
| 30 #include <defaults.h> | |
| 3974 | 31 #include "Cell.h" |
| 2974 | 32 #include "defun.h" |
| 33 #include "error.h" | |
| 34 #include "input.h" | |
| 35 #include "oct-obj.h" | |
| 36 #include "ov-usr-fcn.h" | |
| 37 #include "ov.h" | |
| 38 #include "pager.h" | |
| 2985 | 39 #include "pt-jump.h" |
| 2974 | 40 #include "pt-misc.h" |
| 41 #include "pt-pr-code.h" | |
| 2982 | 42 #include "pt-stmt.h" |
| 2974 | 43 #include "pt-walk.h" |
| 44 #include "symtab.h" | |
| 45 #include "toplev.h" | |
| 46 #include "unwind-prot.h" | |
| 47 #include "utils.h" | |
| 3489 | 48 #include "parse.h" |
| 2974 | 49 #include "variables.h" |
| 50 | |
| 3131 | 51 // Maximum nesting level for functions called recursively. |
| 5794 | 52 static int Vmax_recursion_depth = 256; |
| 3131 | 53 |
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54 // User defined scripts. |
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55 |
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56 DEFINE_OCTAVE_ALLOCATOR (octave_user_script); |
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57 |
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58 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_script, |
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59 "user-defined script", |
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60 "user-defined script"); |
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61 |
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62 octave_user_script::octave_user_script (void) |
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63 : octave_user_code (), cmd_list (0), file_name (), |
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64 t_parsed (static_cast<time_t> (0)), |
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65 t_checked (static_cast<time_t> (0)), |
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66 call_depth (-1) |
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67 { } |
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68 |
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69 octave_user_script::octave_user_script (const std::string& fnm, |
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70 const std::string& nm, |
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71 tree_statement_list *cmds, |
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72 const std::string& ds) |
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73 : octave_user_code (nm, ds), cmd_list (cmds), file_name (fnm), |
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74 t_parsed (static_cast<time_t> (0)), |
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75 t_checked (static_cast<time_t> (0)), |
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76 call_depth (-1) |
| 7736 | 77 { |
| 78 if (cmd_list) | |
| 79 cmd_list->mark_as_script_body (); | |
| 80 } | |
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81 |
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82 octave_user_script::octave_user_script (const std::string& fnm, |
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83 const std::string& nm, |
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84 const std::string& ds) |
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85 : octave_user_code (nm, ds), cmd_list (0), file_name (fnm), |
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86 t_parsed (static_cast<time_t> (0)), |
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87 t_checked (static_cast<time_t> (0)), |
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88 call_depth (-1) |
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89 { } |
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90 |
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91 octave_user_script::~octave_user_script (void) |
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92 { |
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93 delete cmd_list; |
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94 } |
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95 |
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96 octave_value_list |
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97 octave_user_script::subsref (const std::string&, |
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98 const std::list<octave_value_list>&, int) |
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99 { |
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100 octave_value_list retval; |
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101 |
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102 ::error ("invalid use of script in index expression"); |
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103 |
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104 return retval; |
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105 } |
| 7336 | 106 |
| 107 octave_value_list | |
| 108 octave_user_script::do_multi_index_op (int nargout, | |
| 109 const octave_value_list& args) | |
| 110 { | |
| 111 octave_value_list retval; | |
| 112 | |
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113 unwind_protect::begin_frame ("user_script_eval"); |
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114 |
| 7336 | 115 if (! error_state) |
| 116 { | |
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117 if (args.length () == 0 && nargout == 0) |
| 7336 | 118 { |
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119 if (cmd_list) |
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120 { |
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121 unwind_protect_int (call_depth); |
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122 call_depth++; |
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123 |
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124 if (call_depth < Vmax_recursion_depth) |
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125 { |
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126 octave_call_stack::push (this); |
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127 |
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128 unwind_protect::add (octave_call_stack::unwind_pop, 0); |
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129 |
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130 cmd_list->eval (); |
| 7336 | 131 |
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132 if (tree_return_command::returning) |
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133 tree_return_command::returning = 0; |
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134 |
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135 if (tree_break_command::breaking) |
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136 tree_break_command::breaking--; |
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137 } |
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138 else |
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139 ::error ("max_recursion_limit exceeded"); |
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140 } |
| 7336 | 141 } |
| 142 else | |
| 143 error ("invalid call to script"); | |
| 144 } | |
| 145 | |
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146 unwind_protect::run_frame ("user_script_eval"); |
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147 |
| 7336 | 148 return retval; |
| 149 } | |
| 150 | |
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151 void |
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152 octave_user_script::accept (tree_walker& tw) |
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153 { |
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154 tw.visit_octave_user_script (*this); |
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155 } |
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156 |
| 2974 | 157 // User defined functions. |
| 158 | |
| 3219 | 159 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
| 2974 | 160 |
| 3219 | 161 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
| 4612 | 162 "user-defined function", |
| 3219 | 163 "user-defined function"); |
| 2974 | 164 |
| 165 // Ugh. This really needs to be simplified (code/data? | |
| 166 // extrinsic/intrinsic state?). | |
| 167 | |
| 168 octave_user_function::octave_user_function | |
| 7336 | 169 (symbol_table::scope_id sid, tree_parameter_list *pl, |
| 170 tree_parameter_list *rl, tree_statement_list *cl) | |
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171 : octave_user_code (std::string (), std::string ()), |
| 2974 | 172 param_list (pl), ret_list (rl), cmd_list (cl), |
| 7336 | 173 lead_comm (), trail_comm (), file_name (), |
| 6323 | 174 parent_name (), t_parsed (static_cast<time_t> (0)), |
| 3255 | 175 t_checked (static_cast<time_t> (0)), |
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176 system_fcn_file (false), call_depth (-1), |
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177 num_named_args (param_list ? param_list->length () : 0), |
| 7336 | 178 nested_function (false), inline_function (false), |
| 179 class_constructor (false), class_method (false), xdispatch_class (), | |
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180 args_passed (), num_args_passed (0), parent_scope (-1), local_scope (sid) |
| 7736 | 181 { |
| 182 if (cmd_list) | |
| 183 cmd_list->mark_as_function_body (); | |
| 184 } | |
| 2974 | 185 |
| 186 octave_user_function::~octave_user_function (void) | |
| 187 { | |
| 188 delete param_list; | |
| 189 delete ret_list; | |
| 190 delete cmd_list; | |
| 3665 | 191 delete lead_comm; |
| 192 delete trail_comm; | |
| 7336 | 193 |
| 194 symbol_table::erase_scope (local_scope); | |
| 2974 | 195 } |
| 196 | |
| 197 octave_user_function * | |
| 198 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 199 { | |
| 200 ret_list = t; | |
| 201 | |
| 202 return this; | |
| 203 } | |
| 204 | |
| 205 void | |
| 4343 | 206 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 207 { |
| 4343 | 208 file_name = nm; |
| 2974 | 209 } |
| 210 | |
| 211 void | |
| 212 octave_user_function::mark_as_system_fcn_file (void) | |
| 213 { | |
| 214 if (! file_name.empty ()) | |
| 215 { | |
| 216 // We really should stash the whole path to the file we found, | |
| 217 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 218 // FIXME |
| 2974 | 219 // |
| 220 // We probably also don't need to get the library directory | |
| 221 // every time, but since this function is only called when the | |
| 222 // function file is parsed, it probably doesn't matter that | |
| 223 // much. | |
| 224 | |
| 3523 | 225 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 226 |
| 3565 | 227 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
| 2974 | 228 system_fcn_file = 1; |
| 229 } | |
| 230 else | |
| 231 system_fcn_file = 0; | |
| 232 } | |
| 233 | |
| 234 bool | |
| 235 octave_user_function::takes_varargs (void) const | |
| 236 { | |
| 237 return (param_list && param_list->takes_varargs ()); | |
| 238 } | |
| 239 | |
| 5848 | 240 bool |
| 241 octave_user_function::takes_var_return (void) const | |
| 2974 | 242 { |
| 5848 | 243 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 244 } |
| 245 | |
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246 void |
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247 octave_user_function::lock_subfunctions (void) |
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248 { |
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249 symbol_table::lock_subfunctions (local_scope); |
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250 } |
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251 |
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252 void |
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253 octave_user_function::unlock_subfunctions (void) |
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254 { |
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255 symbol_table::unlock_subfunctions (local_scope); |
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256 } |
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257 |
| 2974 | 258 octave_value_list |
| 259 octave_user_function::octave_all_va_args (void) | |
| 260 { | |
| 261 octave_value_list retval; | |
| 262 | |
| 3178 | 263 int n = num_args_passed - num_named_args; |
| 2974 | 264 |
| 3178 | 265 if (n > 0) |
| 266 { | |
| 267 retval.resize (n); | |
| 268 | |
| 269 int k = 0; | |
| 270 for (int i = num_named_args; i < num_args_passed; i++) | |
| 271 retval(k++) = args_passed(i); | |
| 272 } | |
| 2974 | 273 |
| 274 return retval; | |
| 275 } | |
| 276 | |
| 277 static void | |
| 3239 | 278 clear_param_list (void *lst) |
| 279 { | |
| 280 tree_parameter_list *tmp = static_cast<tree_parameter_list *> (lst); | |
| 281 | |
| 282 if (tmp) | |
| 4219 | 283 tmp->undefine (); |
| 3239 | 284 } |
| 285 | |
| 286 static void | |
| 3875 | 287 restore_args_passed (void *fcn) |
| 3239 | 288 { |
| 289 octave_user_function *tmp = static_cast<octave_user_function *> (fcn); | |
| 290 | |
| 291 if (tmp) | |
| 3875 | 292 tmp->restore_args_passed (); |
| 3239 | 293 } |
| 294 | |
| 2974 | 295 octave_value_list |
| 4247 | 296 octave_user_function::subsref (const std::string& type, |
| 4219 | 297 const std::list<octave_value_list>& idx, |
| 3933 | 298 int nargout) |
| 299 { | |
| 300 octave_value_list retval; | |
| 301 | |
| 302 switch (type[0]) | |
| 303 { | |
| 304 case '(': | |
| 5154 | 305 { |
| 5155 | 306 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 307 |
| 308 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 309 } | |
| 3933 | 310 break; |
| 311 | |
| 312 case '{': | |
| 313 case '.': | |
| 314 { | |
| 315 std::string nm = type_name (); | |
| 316 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 317 } | |
| 318 break; | |
| 319 | |
| 320 default: | |
| 321 panic_impossible (); | |
| 322 } | |
| 323 | |
| 5775 | 324 // FIXME -- perhaps there should be an |
| 4059 | 325 // octave_value_list::next_subsref member function? See also |
| 326 // octave_builtin::subsref. | |
| 3933 | 327 |
| 4219 | 328 if (idx.size () > 1) |
| 4994 | 329 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 330 |
| 331 return retval; | |
| 3933 | 332 } |
| 333 | |
| 334 octave_value_list | |
| 3544 | 335 octave_user_function::do_multi_index_op (int nargout, |
| 336 const octave_value_list& args) | |
| 2974 | 337 { |
| 338 octave_value_list retval; | |
| 339 | |
| 340 if (error_state) | |
| 341 return retval; | |
| 342 | |
| 343 if (! cmd_list) | |
| 344 return retval; | |
| 345 | |
| 346 int nargin = args.length (); | |
| 347 | |
| 4987 | 348 unwind_protect::begin_frame ("user_func_eval"); |
| 2974 | 349 |
| 350 unwind_protect_int (call_depth); | |
| 351 call_depth++; | |
| 352 | |
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353 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 354 { |
| 355 ::error ("max_recursion_limit exceeded"); | |
| 4987 | 356 unwind_protect::run_frame ("user_func_eval"); |
| 3131 | 357 return retval; |
| 358 } | |
| 359 | |
| 7336 | 360 // Save old and set current symbol table context, for |
| 361 // eval_undefined_error(). | |
| 362 | |
| 363 symbol_table::push_scope (local_scope); | |
| 364 unwind_protect::add (symbol_table::pop_scope); | |
| 2974 | 365 |
| 7901 | 366 octave_call_stack::push (this, local_scope, call_depth); |
| 367 unwind_protect::add (octave_call_stack::unwind_pop, 0); | |
| 368 | |
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369 if (call_depth > 0) |
| 2974 | 370 { |
| 7336 | 371 symbol_table::push_context (); |
| 2974 | 372 |
| 7336 | 373 unwind_protect::add (symbol_table::pop_context); |
| 374 } | |
| 375 else | |
| 376 { | |
| 377 // Force symbols to be undefined again when this function exits. | |
| 378 unwind_protect::add (symbol_table::clear_variables); | |
| 379 } | |
| 2974 | 380 |
| 3875 | 381 // Save and restore args passed for recursive calls. |
| 2974 | 382 |
| 3875 | 383 save_args_passed (args); |
| 3239 | 384 |
| 3875 | 385 unwind_protect::add (::restore_args_passed, this); |
| 3239 | 386 |
| 2974 | 387 string_vector arg_names = args.name_tags (); |
| 388 | |
| 389 unwind_protect_int (num_args_passed); | |
| 390 num_args_passed = nargin; | |
| 391 | |
| 392 if (param_list && ! param_list->varargs_only ()) | |
| 393 { | |
| 394 param_list->define_from_arg_vector (args); | |
| 395 if (error_state) | |
| 396 goto abort; | |
| 397 } | |
| 398 | |
| 3239 | 399 // Force parameter list to be undefined when this function exits. |
| 400 // Doing so decrements the reference counts on the values of local | |
| 401 // variables that are also named function parameters. | |
| 402 | |
| 403 unwind_protect::add (clear_param_list, param_list); | |
| 404 | |
| 405 // Force return list to be undefined when this function exits. | |
| 406 // Doing so decrements the reference counts on the values of local | |
| 407 // variables that are also named values returned by this function. | |
| 408 | |
| 409 unwind_protect::add (clear_param_list, ret_list); | |
| 410 | |
| 2974 | 411 // The following code is in a separate scope to avoid warnings from |
| 412 // G++ about `goto abort' crossing the initialization of some | |
| 413 // variables. | |
| 414 | |
| 415 { | |
| 3974 | 416 bind_automatic_vars (arg_names, nargin, nargout, octave_all_va_args ()); |
| 2974 | 417 |
| 418 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 419 | |
| 420 if (echo_commands) | |
| 421 print_code_function_header (); | |
| 422 | |
| 423 // Evaluate the commands that make up the function. | |
| 424 | |
| 3489 | 425 unwind_protect_bool (evaluating_function_body); |
| 426 evaluating_function_body = true; | |
| 427 | |
| 6657 | 428 if (is_inline_function ()) |
| 429 { | |
| 430 assert (cmd_list->length () == 1); | |
| 431 | |
| 432 retval = cmd_list->eval (false, nargout); | |
| 433 } | |
| 434 else | |
| 435 cmd_list->eval (); | |
| 2974 | 436 |
| 437 if (echo_commands) | |
| 438 print_code_function_trailer (); | |
| 439 | |
| 4207 | 440 if (tree_return_command::returning) |
| 441 tree_return_command::returning = 0; | |
| 2974 | 442 |
| 4207 | 443 if (tree_break_command::breaking) |
| 444 tree_break_command::breaking--; | |
| 2974 | 445 |
| 446 if (error_state) | |
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447 goto abort; |
| 2974 | 448 |
| 449 // Copy return values out. | |
| 450 | |
| 6657 | 451 if (ret_list && ! is_inline_function ()) |
| 3871 | 452 { |
| 4748 | 453 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 454 |
| 5848 | 455 Cell varargout; |
| 456 | |
| 6591 | 457 if (ret_list->takes_varargs ()) |
| 5848 | 458 { |
| 7336 | 459 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 460 |
| 7336 | 461 if (varargout_varval.is_defined ()) |
| 6591 | 462 { |
| 7336 | 463 varargout = varargout_varval.cell_value (); |
| 5848 | 464 |
| 6591 | 465 if (error_state) |
| 466 error ("expecting varargout to be a cell array object"); | |
| 467 } | |
| 5848 | 468 } |
| 469 | |
| 470 if (! error_state) | |
| 471 retval = ret_list->convert_to_const_vector (varargout); | |
| 3871 | 472 } |
| 2974 | 473 } |
| 474 | |
| 475 abort: | |
| 4987 | 476 unwind_protect::run_frame ("user_func_eval"); |
| 2974 | 477 |
| 478 return retval; | |
| 479 } | |
| 480 | |
| 481 void | |
| 482 octave_user_function::accept (tree_walker& tw) | |
| 483 { | |
| 484 tw.visit_octave_user_function (*this); | |
| 485 } | |
| 486 | |
| 7336 | 487 #if 0 |
| 2974 | 488 void |
| 3933 | 489 octave_user_function::print_symtab_info (std::ostream& os) const |
| 490 { | |
| 7336 | 491 symbol_table::print_info (os, local_scope); |
| 3933 | 492 } |
| 7336 | 493 #endif |
| 3933 | 494 |
| 495 void | |
| 2974 | 496 octave_user_function::print_code_function_header (void) |
| 497 { | |
| 5794 | 498 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 499 |
| 500 tpc.visit_octave_user_function_header (*this); | |
| 501 } | |
| 502 | |
| 503 void | |
| 504 octave_user_function::print_code_function_trailer (void) | |
| 505 { | |
| 5794 | 506 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 507 |
| 508 tpc.visit_octave_user_function_trailer (*this); | |
| 509 } | |
| 510 | |
| 511 void | |
| 512 octave_user_function::bind_automatic_vars | |
| 3974 | 513 (const string_vector& arg_names, int nargin, int nargout, |
| 514 const octave_value_list& va_args) | |
| 2974 | 515 { |
| 516 if (! arg_names.empty ()) | |
| 7336 | 517 symbol_table::varref ("argn") = arg_names; |
| 2974 | 518 |
| 7336 | 519 symbol_table::varref (".nargin.") = nargin; |
| 520 symbol_table::varref (".nargout.") = nargout; | |
| 521 | |
| 522 symbol_table::mark_hidden (".nargin."); | |
| 523 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 524 |
| 525 if (takes_varargs ()) | |
| 526 { | |
| 527 int n = va_args.length (); | |
| 528 | |
| 529 Cell varargin (1, n); | |
| 530 | |
| 531 for (int i = 0; i < n; i++) | |
| 532 varargin(0,i) = va_args(i); | |
| 533 | |
| 7336 | 534 symbol_table::varref ("varargin") = varargin; |
| 3974 | 535 } |
| 2974 | 536 } |
| 537 | |
| 4700 | 538 DEFUN (nargin, args, , |
| 539 "-*- texinfo -*-\n\ | |
| 540 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 541 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 542 Within a function, return the number of arguments passed to the function.\n\ | |
| 543 At the top level, return the number of command line arguments passed to\n\ | |
| 544 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 545 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 546 function accepts a variable number of arguments.\n\ | |
| 5642 | 547 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 548 @end deftypefn") |
| 549 { | |
| 550 octave_value retval; | |
| 551 | |
| 552 int nargin = args.length (); | |
| 553 | |
| 554 if (nargin == 1) | |
| 555 { | |
| 556 std::string fname = args(0).string_value (); | |
| 557 | |
| 558 if (! error_state) | |
| 559 { | |
| 7336 | 560 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 561 |
| 562 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 563 |
| 564 if (fcn) | |
| 565 { | |
| 566 if (fcn->takes_varargs ()) | |
| 567 retval = -1; | |
| 568 else | |
| 569 { | |
| 570 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 571 | |
| 572 retval = param_list ? param_list->length () : 0; | |
| 573 } | |
| 574 } | |
| 575 else | |
| 576 error ("nargin: invalid function"); | |
| 577 } | |
| 578 else | |
| 579 error ("nargin: expecting string as first argument"); | |
| 580 } | |
| 581 else if (nargin == 0) | |
| 582 { | |
| 7336 | 583 retval = symbol_table::varval (".nargin."); |
| 4700 | 584 |
| 7336 | 585 if (retval.is_undefined ()) |
| 586 retval = 0; | |
| 4700 | 587 } |
| 588 else | |
| 5823 | 589 print_usage (); |
| 4700 | 590 |
| 591 return retval; | |
| 592 } | |
| 593 | |
| 594 DEFUN (nargout, args, , | |
| 595 "-*- texinfo -*-\n\ | |
| 596 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 597 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 598 Within a function, return the number of values the caller expects to\n\ | |
| 599 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 600 maximum number of values the named function can produce, or -1 if the\n\ | |
| 601 function can produce a variable number of values.\n\ | |
| 602 \n\ | |
| 603 For example,\n\ | |
| 604 \n\ | |
| 605 @example\n\ | |
| 606 f ()\n\ | |
| 607 @end example\n\ | |
| 608 \n\ | |
| 609 @noindent\n\ | |
| 4704 | 610 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 611 \n\ |
| 612 @example\n\ | |
| 613 [s, t] = f ()\n\ | |
| 614 @end example\n\ | |
| 615 \n\ | |
| 616 @noindent\n\ | |
| 617 will cause @code{nargout} to return 2 inside the function\n\ | |
| 618 @code{f}.\n\ | |
| 619 \n\ | |
| 620 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 621 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 622 @end deftypefn") |
| 623 { | |
| 624 octave_value retval; | |
| 625 | |
| 626 int nargin = args.length (); | |
| 627 | |
| 628 if (nargin == 1) | |
| 629 { | |
| 630 std::string fname = args(0).string_value (); | |
| 631 | |
| 632 if (! error_state) | |
| 633 { | |
| 7336 | 634 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 635 |
| 636 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 637 |
| 638 if (fcn) | |
| 639 { | |
| 640 if (fcn->takes_var_return ()) | |
| 641 retval = -1; | |
| 642 else | |
| 643 { | |
| 644 tree_parameter_list *ret_list = fcn->return_list (); | |
| 645 | |
| 646 retval = ret_list ? ret_list->length () : 0; | |
| 647 } | |
| 648 } | |
| 649 else | |
| 650 error ("nargout: invalid function"); | |
| 651 } | |
| 652 else | |
| 653 error ("nargout: expecting string as first argument"); | |
| 654 } | |
| 655 else if (nargin == 0) | |
| 656 { | |
| 7336 | 657 if (! symbol_table::at_top_level ()) |
| 4700 | 658 { |
| 7336 | 659 retval = symbol_table::varval (".nargout."); |
| 4700 | 660 |
| 7336 | 661 if (retval.is_undefined ()) |
| 662 retval = 0; | |
| 4700 | 663 } |
| 664 else | |
| 665 error ("nargout: invalid call at top level"); | |
| 666 } | |
| 667 else | |
| 5823 | 668 print_usage (); |
| 4700 | 669 |
| 670 return retval; | |
| 671 } | |
| 672 | |
| 5794 | 673 DEFUN (max_recursion_depth, args, nargout, |
| 674 "-*- texinfo -*-\n\ | |
| 675 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 676 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 677 Query or set the internal limit on the number of times a function may\n\ | |
| 678 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 679 printed and control returns to the top level.\n\ | |
| 680 @end deftypefn") | |
| 3131 | 681 { |
| 5794 | 682 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 683 } |
| 684 | |
| 685 /* | |
| 686 ;;; Local Variables: *** | |
| 687 ;;; mode: C++ *** | |
| 688 ;;; End: *** | |
| 689 */ |