Mercurial > octave-nkf
annotate src/ov-usr-fcn.cc @ 8013:b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 06 Aug 2008 14:40:16 -0400 |
| parents | 3100283874d7 |
| children | 54b41376e381 |
| 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 if (error_state) |
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139 octave_call_stack::backtrace_error_message (); |
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140 } |
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141 else |
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142 ::error ("max_recursion_limit exceeded"); |
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143 } |
| 7336 | 144 } |
| 145 else | |
| 146 error ("invalid call to script"); | |
| 147 } | |
| 148 | |
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149 unwind_protect::run_frame ("user_script_eval"); |
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150 |
| 7336 | 151 return retval; |
| 152 } | |
| 153 | |
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154 void |
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155 octave_user_script::accept (tree_walker& tw) |
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156 { |
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157 tw.visit_octave_user_script (*this); |
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158 } |
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159 |
| 2974 | 160 // User defined functions. |
| 161 | |
| 3219 | 162 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
| 2974 | 163 |
| 3219 | 164 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
| 4612 | 165 "user-defined function", |
| 3219 | 166 "user-defined function"); |
| 2974 | 167 |
| 168 // Ugh. This really needs to be simplified (code/data? | |
| 169 // extrinsic/intrinsic state?). | |
| 170 | |
| 171 octave_user_function::octave_user_function | |
| 7336 | 172 (symbol_table::scope_id sid, tree_parameter_list *pl, |
| 173 tree_parameter_list *rl, tree_statement_list *cl) | |
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174 : octave_user_code (std::string (), std::string ()), |
| 2974 | 175 param_list (pl), ret_list (rl), cmd_list (cl), |
| 7336 | 176 lead_comm (), trail_comm (), file_name (), |
| 6323 | 177 parent_name (), t_parsed (static_cast<time_t> (0)), |
| 3255 | 178 t_checked (static_cast<time_t> (0)), |
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179 system_fcn_file (false), call_depth (-1), |
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180 num_named_args (param_list ? param_list->length () : 0), |
| 7336 | 181 nested_function (false), inline_function (false), |
| 182 class_constructor (false), class_method (false), xdispatch_class (), | |
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183 args_passed (), num_args_passed (0), parent_scope (-1), local_scope (sid) |
| 7736 | 184 { |
| 185 if (cmd_list) | |
| 186 cmd_list->mark_as_function_body (); | |
| 187 } | |
| 2974 | 188 |
| 189 octave_user_function::~octave_user_function (void) | |
| 190 { | |
| 191 delete param_list; | |
| 192 delete ret_list; | |
| 193 delete cmd_list; | |
| 3665 | 194 delete lead_comm; |
| 195 delete trail_comm; | |
| 7336 | 196 |
| 197 symbol_table::erase_scope (local_scope); | |
| 2974 | 198 } |
| 199 | |
| 200 octave_user_function * | |
| 201 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 202 { | |
| 203 ret_list = t; | |
| 204 | |
| 205 return this; | |
| 206 } | |
| 207 | |
| 208 void | |
| 4343 | 209 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 210 { |
| 4343 | 211 file_name = nm; |
| 2974 | 212 } |
| 213 | |
| 214 void | |
| 215 octave_user_function::mark_as_system_fcn_file (void) | |
| 216 { | |
| 217 if (! file_name.empty ()) | |
| 218 { | |
| 219 // We really should stash the whole path to the file we found, | |
| 220 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 221 // FIXME |
| 2974 | 222 // |
| 223 // We probably also don't need to get the library directory | |
| 224 // every time, but since this function is only called when the | |
| 225 // function file is parsed, it probably doesn't matter that | |
| 226 // much. | |
| 227 | |
| 3523 | 228 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 229 |
| 3565 | 230 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
| 2974 | 231 system_fcn_file = 1; |
| 232 } | |
| 233 else | |
| 234 system_fcn_file = 0; | |
| 235 } | |
| 236 | |
| 237 bool | |
| 238 octave_user_function::takes_varargs (void) const | |
| 239 { | |
| 240 return (param_list && param_list->takes_varargs ()); | |
| 241 } | |
| 242 | |
| 5848 | 243 bool |
| 244 octave_user_function::takes_var_return (void) const | |
| 2974 | 245 { |
| 5848 | 246 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 247 } |
| 248 | |
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249 void |
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250 octave_user_function::lock_subfunctions (void) |
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251 { |
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252 symbol_table::lock_subfunctions (local_scope); |
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253 } |
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254 |
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255 void |
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256 octave_user_function::unlock_subfunctions (void) |
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257 { |
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258 symbol_table::unlock_subfunctions (local_scope); |
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259 } |
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260 |
| 2974 | 261 octave_value_list |
| 262 octave_user_function::octave_all_va_args (void) | |
| 263 { | |
| 264 octave_value_list retval; | |
| 265 | |
| 3178 | 266 int n = num_args_passed - num_named_args; |
| 2974 | 267 |
| 3178 | 268 if (n > 0) |
| 269 { | |
| 270 retval.resize (n); | |
| 271 | |
| 272 int k = 0; | |
| 273 for (int i = num_named_args; i < num_args_passed; i++) | |
| 274 retval(k++) = args_passed(i); | |
| 275 } | |
| 2974 | 276 |
| 277 return retval; | |
| 278 } | |
| 279 | |
| 280 static void | |
| 3239 | 281 clear_param_list (void *lst) |
| 282 { | |
| 283 tree_parameter_list *tmp = static_cast<tree_parameter_list *> (lst); | |
| 284 | |
| 285 if (tmp) | |
| 4219 | 286 tmp->undefine (); |
| 3239 | 287 } |
| 288 | |
| 289 static void | |
| 3875 | 290 restore_args_passed (void *fcn) |
| 3239 | 291 { |
| 292 octave_user_function *tmp = static_cast<octave_user_function *> (fcn); | |
| 293 | |
| 294 if (tmp) | |
| 3875 | 295 tmp->restore_args_passed (); |
| 3239 | 296 } |
| 297 | |
| 2974 | 298 octave_value_list |
| 4247 | 299 octave_user_function::subsref (const std::string& type, |
| 4219 | 300 const std::list<octave_value_list>& idx, |
| 3933 | 301 int nargout) |
| 302 { | |
| 303 octave_value_list retval; | |
| 304 | |
| 305 switch (type[0]) | |
| 306 { | |
| 307 case '(': | |
| 5154 | 308 { |
| 5155 | 309 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 310 |
| 311 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 312 } | |
| 3933 | 313 break; |
| 314 | |
| 315 case '{': | |
| 316 case '.': | |
| 317 { | |
| 318 std::string nm = type_name (); | |
| 319 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 320 } | |
| 321 break; | |
| 322 | |
| 323 default: | |
| 324 panic_impossible (); | |
| 325 } | |
| 326 | |
| 5775 | 327 // FIXME -- perhaps there should be an |
| 4059 | 328 // octave_value_list::next_subsref member function? See also |
| 329 // octave_builtin::subsref. | |
| 3933 | 330 |
| 4219 | 331 if (idx.size () > 1) |
| 4994 | 332 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 333 |
| 334 return retval; | |
| 3933 | 335 } |
| 336 | |
| 337 octave_value_list | |
| 3544 | 338 octave_user_function::do_multi_index_op (int nargout, |
| 339 const octave_value_list& args) | |
| 2974 | 340 { |
| 341 octave_value_list retval; | |
| 342 | |
| 343 if (error_state) | |
| 344 return retval; | |
| 345 | |
| 346 if (! cmd_list) | |
| 347 return retval; | |
| 348 | |
| 349 int nargin = args.length (); | |
| 350 | |
| 4987 | 351 unwind_protect::begin_frame ("user_func_eval"); |
| 2974 | 352 |
| 353 unwind_protect_int (call_depth); | |
| 354 call_depth++; | |
| 355 | |
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356 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 357 { |
| 358 ::error ("max_recursion_limit exceeded"); | |
| 4987 | 359 unwind_protect::run_frame ("user_func_eval"); |
| 3131 | 360 return retval; |
| 361 } | |
| 362 | |
| 7336 | 363 // Save old and set current symbol table context, for |
| 364 // eval_undefined_error(). | |
| 365 | |
| 366 symbol_table::push_scope (local_scope); | |
| 367 unwind_protect::add (symbol_table::pop_scope); | |
| 2974 | 368 |
| 7901 | 369 octave_call_stack::push (this, local_scope, call_depth); |
| 370 unwind_protect::add (octave_call_stack::unwind_pop, 0); | |
| 371 | |
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372 if (call_depth > 0) |
| 2974 | 373 { |
| 7336 | 374 symbol_table::push_context (); |
| 2974 | 375 |
| 7336 | 376 unwind_protect::add (symbol_table::pop_context); |
| 377 } | |
| 378 else | |
| 379 { | |
| 380 // Force symbols to be undefined again when this function exits. | |
| 381 unwind_protect::add (symbol_table::clear_variables); | |
| 382 } | |
| 2974 | 383 |
| 3875 | 384 // Save and restore args passed for recursive calls. |
| 2974 | 385 |
| 3875 | 386 save_args_passed (args); |
| 3239 | 387 |
| 3875 | 388 unwind_protect::add (::restore_args_passed, this); |
| 3239 | 389 |
| 2974 | 390 string_vector arg_names = args.name_tags (); |
| 391 | |
| 392 unwind_protect_int (num_args_passed); | |
| 393 num_args_passed = nargin; | |
| 394 | |
| 395 if (param_list && ! param_list->varargs_only ()) | |
| 396 { | |
| 397 param_list->define_from_arg_vector (args); | |
| 398 if (error_state) | |
| 399 goto abort; | |
| 400 } | |
| 401 | |
| 3239 | 402 // Force parameter list to be undefined when this function exits. |
| 403 // Doing so decrements the reference counts on the values of local | |
| 404 // variables that are also named function parameters. | |
| 405 | |
| 406 unwind_protect::add (clear_param_list, param_list); | |
| 407 | |
| 408 // Force return list to be undefined when this function exits. | |
| 409 // Doing so decrements the reference counts on the values of local | |
| 410 // variables that are also named values returned by this function. | |
| 411 | |
| 412 unwind_protect::add (clear_param_list, ret_list); | |
| 413 | |
| 2974 | 414 // The following code is in a separate scope to avoid warnings from |
| 415 // G++ about `goto abort' crossing the initialization of some | |
| 416 // variables. | |
| 417 | |
| 418 { | |
| 3974 | 419 bind_automatic_vars (arg_names, nargin, nargout, octave_all_va_args ()); |
| 2974 | 420 |
| 421 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 422 | |
| 423 if (echo_commands) | |
| 424 print_code_function_header (); | |
| 425 | |
| 426 // Evaluate the commands that make up the function. | |
| 427 | |
| 3489 | 428 unwind_protect_bool (evaluating_function_body); |
| 429 evaluating_function_body = true; | |
| 430 | |
| 6657 | 431 if (is_inline_function ()) |
| 432 { | |
| 433 assert (cmd_list->length () == 1); | |
| 434 | |
| 435 retval = cmd_list->eval (false, nargout); | |
| 436 } | |
| 437 else | |
| 438 cmd_list->eval (); | |
| 2974 | 439 |
| 440 if (echo_commands) | |
| 441 print_code_function_trailer (); | |
| 442 | |
| 4207 | 443 if (tree_return_command::returning) |
| 444 tree_return_command::returning = 0; | |
| 2974 | 445 |
| 4207 | 446 if (tree_break_command::breaking) |
| 447 tree_break_command::breaking--; | |
| 2974 | 448 |
| 449 if (error_state) | |
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450 { |
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451 octave_call_stack::backtrace_error_message (); |
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452 goto abort; |
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453 } |
| 2974 | 454 |
| 455 // Copy return values out. | |
| 456 | |
| 6657 | 457 if (ret_list && ! is_inline_function ()) |
| 3871 | 458 { |
| 4748 | 459 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 460 |
| 5848 | 461 Cell varargout; |
| 462 | |
| 6591 | 463 if (ret_list->takes_varargs ()) |
| 5848 | 464 { |
| 7336 | 465 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 466 |
| 7336 | 467 if (varargout_varval.is_defined ()) |
| 6591 | 468 { |
| 7336 | 469 varargout = varargout_varval.cell_value (); |
| 5848 | 470 |
| 6591 | 471 if (error_state) |
| 472 error ("expecting varargout to be a cell array object"); | |
| 473 } | |
| 5848 | 474 } |
| 475 | |
| 476 if (! error_state) | |
| 477 retval = ret_list->convert_to_const_vector (varargout); | |
| 3871 | 478 } |
| 2974 | 479 } |
| 480 | |
| 481 abort: | |
| 4987 | 482 unwind_protect::run_frame ("user_func_eval"); |
| 2974 | 483 |
| 484 return retval; | |
| 485 } | |
| 486 | |
| 487 void | |
| 488 octave_user_function::accept (tree_walker& tw) | |
| 489 { | |
| 490 tw.visit_octave_user_function (*this); | |
| 491 } | |
| 492 | |
| 7336 | 493 #if 0 |
| 2974 | 494 void |
| 3933 | 495 octave_user_function::print_symtab_info (std::ostream& os) const |
| 496 { | |
| 7336 | 497 symbol_table::print_info (os, local_scope); |
| 3933 | 498 } |
| 7336 | 499 #endif |
| 3933 | 500 |
| 501 void | |
| 2974 | 502 octave_user_function::print_code_function_header (void) |
| 503 { | |
| 5794 | 504 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 505 |
| 506 tpc.visit_octave_user_function_header (*this); | |
| 507 } | |
| 508 | |
| 509 void | |
| 510 octave_user_function::print_code_function_trailer (void) | |
| 511 { | |
| 5794 | 512 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 513 |
| 514 tpc.visit_octave_user_function_trailer (*this); | |
| 515 } | |
| 516 | |
| 517 void | |
| 518 octave_user_function::bind_automatic_vars | |
| 3974 | 519 (const string_vector& arg_names, int nargin, int nargout, |
| 520 const octave_value_list& va_args) | |
| 2974 | 521 { |
| 522 if (! arg_names.empty ()) | |
| 7336 | 523 symbol_table::varref ("argn") = arg_names; |
| 2974 | 524 |
| 7336 | 525 symbol_table::varref (".nargin.") = nargin; |
| 526 symbol_table::varref (".nargout.") = nargout; | |
| 527 | |
| 528 symbol_table::mark_hidden (".nargin."); | |
| 529 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 530 |
| 531 if (takes_varargs ()) | |
| 532 { | |
| 533 int n = va_args.length (); | |
| 534 | |
| 535 Cell varargin (1, n); | |
| 536 | |
| 537 for (int i = 0; i < n; i++) | |
| 538 varargin(0,i) = va_args(i); | |
| 539 | |
| 7336 | 540 symbol_table::varref ("varargin") = varargin; |
| 3974 | 541 } |
| 2974 | 542 } |
| 543 | |
| 4700 | 544 DEFUN (nargin, args, , |
| 545 "-*- texinfo -*-\n\ | |
| 546 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 547 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 548 Within a function, return the number of arguments passed to the function.\n\ | |
| 549 At the top level, return the number of command line arguments passed to\n\ | |
| 550 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 551 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 552 function accepts a variable number of arguments.\n\ | |
| 5642 | 553 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 554 @end deftypefn") |
| 555 { | |
| 556 octave_value retval; | |
| 557 | |
| 558 int nargin = args.length (); | |
| 559 | |
| 560 if (nargin == 1) | |
| 561 { | |
| 562 std::string fname = args(0).string_value (); | |
| 563 | |
| 564 if (! error_state) | |
| 565 { | |
| 7336 | 566 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 567 |
| 568 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 569 |
| 570 if (fcn) | |
| 571 { | |
| 572 if (fcn->takes_varargs ()) | |
| 573 retval = -1; | |
| 574 else | |
| 575 { | |
| 576 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 577 | |
| 578 retval = param_list ? param_list->length () : 0; | |
| 579 } | |
| 580 } | |
| 581 else | |
| 582 error ("nargin: invalid function"); | |
| 583 } | |
| 584 else | |
| 585 error ("nargin: expecting string as first argument"); | |
| 586 } | |
| 587 else if (nargin == 0) | |
| 588 { | |
| 7336 | 589 retval = symbol_table::varval (".nargin."); |
| 4700 | 590 |
| 7336 | 591 if (retval.is_undefined ()) |
| 592 retval = 0; | |
| 4700 | 593 } |
| 594 else | |
| 5823 | 595 print_usage (); |
| 4700 | 596 |
| 597 return retval; | |
| 598 } | |
| 599 | |
| 600 DEFUN (nargout, args, , | |
| 601 "-*- texinfo -*-\n\ | |
| 602 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 603 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 604 Within a function, return the number of values the caller expects to\n\ | |
| 605 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 606 maximum number of values the named function can produce, or -1 if the\n\ | |
| 607 function can produce a variable number of values.\n\ | |
| 608 \n\ | |
| 609 For example,\n\ | |
| 610 \n\ | |
| 611 @example\n\ | |
| 612 f ()\n\ | |
| 613 @end example\n\ | |
| 614 \n\ | |
| 615 @noindent\n\ | |
| 4704 | 616 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 617 \n\ |
| 618 @example\n\ | |
| 619 [s, t] = f ()\n\ | |
| 620 @end example\n\ | |
| 621 \n\ | |
| 622 @noindent\n\ | |
| 623 will cause @code{nargout} to return 2 inside the function\n\ | |
| 624 @code{f}.\n\ | |
| 625 \n\ | |
| 626 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 627 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 628 @end deftypefn") |
| 629 { | |
| 630 octave_value retval; | |
| 631 | |
| 632 int nargin = args.length (); | |
| 633 | |
| 634 if (nargin == 1) | |
| 635 { | |
| 636 std::string fname = args(0).string_value (); | |
| 637 | |
| 638 if (! error_state) | |
| 639 { | |
| 7336 | 640 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 641 |
| 642 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 643 |
| 644 if (fcn) | |
| 645 { | |
| 646 if (fcn->takes_var_return ()) | |
| 647 retval = -1; | |
| 648 else | |
| 649 { | |
| 650 tree_parameter_list *ret_list = fcn->return_list (); | |
| 651 | |
| 652 retval = ret_list ? ret_list->length () : 0; | |
| 653 } | |
| 654 } | |
| 655 else | |
| 656 error ("nargout: invalid function"); | |
| 657 } | |
| 658 else | |
| 659 error ("nargout: expecting string as first argument"); | |
| 660 } | |
| 661 else if (nargin == 0) | |
| 662 { | |
| 7336 | 663 if (! symbol_table::at_top_level ()) |
| 4700 | 664 { |
| 7336 | 665 retval = symbol_table::varval (".nargout."); |
| 4700 | 666 |
| 7336 | 667 if (retval.is_undefined ()) |
| 668 retval = 0; | |
| 4700 | 669 } |
| 670 else | |
| 671 error ("nargout: invalid call at top level"); | |
| 672 } | |
| 673 else | |
| 5823 | 674 print_usage (); |
| 4700 | 675 |
| 676 return retval; | |
| 677 } | |
| 678 | |
| 5794 | 679 DEFUN (max_recursion_depth, args, nargout, |
| 680 "-*- texinfo -*-\n\ | |
| 681 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 682 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 683 Query or set the internal limit on the number of times a function may\n\ | |
| 684 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 685 printed and control returns to the top level.\n\ | |
| 686 @end deftypefn") | |
| 3131 | 687 { |
| 5794 | 688 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 689 } |
| 690 | |
| 691 /* | |
| 692 ;;; Local Variables: *** | |
| 693 ;;; mode: C++ *** | |
| 694 ;;; End: *** | |
| 695 */ |