Mercurial > octave-nkf
annotate src/ov-usr-fcn.cc @ 8669:33783e94fb16
line number fixes and other evaluator tweaks
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 04 Feb 2009 13:28:06 -0500 |
| parents | 73c4516fae10 |
| children | 70f5a0375afd |
| 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" | |
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39 #include "pt-eval.h" |
| 2985 | 40 #include "pt-jump.h" |
| 2974 | 41 #include "pt-misc.h" |
| 42 #include "pt-pr-code.h" | |
| 2982 | 43 #include "pt-stmt.h" |
| 2974 | 44 #include "pt-walk.h" |
| 45 #include "symtab.h" | |
| 46 #include "toplev.h" | |
| 47 #include "unwind-prot.h" | |
| 48 #include "utils.h" | |
| 3489 | 49 #include "parse.h" |
| 2974 | 50 #include "variables.h" |
| 51 | |
| 3131 | 52 // Maximum nesting level for functions called recursively. |
| 5794 | 53 static int Vmax_recursion_depth = 256; |
| 3131 | 54 |
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55 // User defined scripts. |
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56 |
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57 DEFINE_OCTAVE_ALLOCATOR (octave_user_script); |
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58 |
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59 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_script, |
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60 "user-defined script", |
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61 "user-defined script"); |
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62 |
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63 octave_user_script::octave_user_script (void) |
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64 : octave_user_code (), cmd_list (0), file_name (), |
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65 t_parsed (static_cast<time_t> (0)), |
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66 t_checked (static_cast<time_t> (0)), |
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67 call_depth (-1) |
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68 { } |
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69 |
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70 octave_user_script::octave_user_script (const std::string& fnm, |
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71 const std::string& nm, |
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72 tree_statement_list *cmds, |
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73 const std::string& ds) |
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74 : octave_user_code (nm, ds), cmd_list (cmds), file_name (fnm), |
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75 t_parsed (static_cast<time_t> (0)), |
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76 t_checked (static_cast<time_t> (0)), |
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77 call_depth (-1) |
| 7736 | 78 { |
| 79 if (cmd_list) | |
| 80 cmd_list->mark_as_script_body (); | |
| 81 } | |
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82 |
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83 octave_user_script::octave_user_script (const std::string& fnm, |
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84 const std::string& nm, |
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85 const std::string& ds) |
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86 : octave_user_code (nm, ds), cmd_list (0), file_name (fnm), |
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87 t_parsed (static_cast<time_t> (0)), |
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88 t_checked (static_cast<time_t> (0)), |
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89 call_depth (-1) |
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90 { } |
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91 |
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92 octave_user_script::~octave_user_script (void) |
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93 { |
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94 delete cmd_list; |
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95 } |
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96 |
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97 octave_value_list |
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98 octave_user_script::subsref (const std::string&, |
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99 const std::list<octave_value_list>&, int) |
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100 { |
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101 octave_value_list retval; |
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102 |
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103 ::error ("invalid use of script in index expression"); |
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104 |
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105 return retval; |
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106 } |
| 7336 | 107 |
| 108 octave_value_list | |
| 109 octave_user_script::do_multi_index_op (int nargout, | |
| 110 const octave_value_list& args) | |
| 111 { | |
| 112 octave_value_list retval; | |
| 113 | |
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114 unwind_protect::begin_frame ("user_script_eval"); |
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115 |
| 7336 | 116 if (! error_state) |
| 117 { | |
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118 if (args.length () == 0 && nargout == 0) |
| 7336 | 119 { |
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120 if (cmd_list) |
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121 { |
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122 unwind_protect_int (call_depth); |
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123 call_depth++; |
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124 |
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125 if (call_depth < Vmax_recursion_depth) |
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126 { |
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127 octave_call_stack::push (this); |
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128 |
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129 unwind_protect::add (octave_call_stack::unwind_pop, 0); |
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130 |
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131 unwind_protect_bool (tree_evaluator::in_fcn_or_script_body); |
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132 tree_evaluator::in_fcn_or_script_body = true; |
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133 |
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134 cmd_list->accept (*current_evaluator); |
| 7336 | 135 |
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136 if (tree_return_command::returning) |
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137 tree_return_command::returning = 0; |
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138 |
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139 if (tree_break_command::breaking) |
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140 tree_break_command::breaking--; |
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141 |
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142 if (error_state) |
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143 octave_call_stack::backtrace_error_message (); |
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144 } |
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145 else |
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146 ::error ("max_recursion_limit exceeded"); |
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147 } |
| 7336 | 148 } |
| 149 else | |
| 150 error ("invalid call to script"); | |
| 151 } | |
| 152 | |
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153 unwind_protect::run_frame ("user_script_eval"); |
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154 |
| 7336 | 155 return retval; |
| 156 } | |
| 157 | |
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158 void |
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159 octave_user_script::accept (tree_walker& tw) |
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160 { |
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161 tw.visit_octave_user_script (*this); |
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162 } |
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163 |
| 2974 | 164 // User defined functions. |
| 165 | |
| 3219 | 166 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
| 2974 | 167 |
| 3219 | 168 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
| 4612 | 169 "user-defined function", |
| 3219 | 170 "user-defined function"); |
| 2974 | 171 |
| 172 // Ugh. This really needs to be simplified (code/data? | |
| 173 // extrinsic/intrinsic state?). | |
| 174 | |
| 175 octave_user_function::octave_user_function | |
| 7336 | 176 (symbol_table::scope_id sid, tree_parameter_list *pl, |
| 177 tree_parameter_list *rl, tree_statement_list *cl) | |
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178 : octave_user_code (std::string (), std::string ()), |
| 2974 | 179 param_list (pl), ret_list (rl), cmd_list (cl), |
| 7336 | 180 lead_comm (), trail_comm (), file_name (), |
| 6323 | 181 parent_name (), t_parsed (static_cast<time_t> (0)), |
| 3255 | 182 t_checked (static_cast<time_t> (0)), |
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183 system_fcn_file (false), call_depth (-1), |
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184 num_named_args (param_list ? param_list->length () : 0), |
| 7336 | 185 nested_function (false), inline_function (false), |
| 186 class_constructor (false), class_method (false), xdispatch_class (), | |
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187 args_passed (), num_args_passed (0), parent_scope (-1), local_scope (sid) |
| 7736 | 188 { |
| 189 if (cmd_list) | |
| 190 cmd_list->mark_as_function_body (); | |
| 191 } | |
| 2974 | 192 |
| 193 octave_user_function::~octave_user_function (void) | |
| 194 { | |
| 195 delete param_list; | |
| 196 delete ret_list; | |
| 197 delete cmd_list; | |
| 3665 | 198 delete lead_comm; |
| 199 delete trail_comm; | |
| 7336 | 200 |
| 201 symbol_table::erase_scope (local_scope); | |
| 2974 | 202 } |
| 203 | |
| 204 octave_user_function * | |
| 205 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 206 { | |
| 207 ret_list = t; | |
| 208 | |
| 209 return this; | |
| 210 } | |
| 211 | |
| 212 void | |
| 4343 | 213 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 214 { |
| 4343 | 215 file_name = nm; |
| 2974 | 216 } |
| 217 | |
| 218 void | |
| 219 octave_user_function::mark_as_system_fcn_file (void) | |
| 220 { | |
| 221 if (! file_name.empty ()) | |
| 222 { | |
| 223 // We really should stash the whole path to the file we found, | |
| 224 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 225 // FIXME |
| 2974 | 226 // |
| 227 // We probably also don't need to get the library directory | |
| 228 // every time, but since this function is only called when the | |
| 229 // function file is parsed, it probably doesn't matter that | |
| 230 // much. | |
| 231 | |
| 3523 | 232 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 233 |
| 3565 | 234 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
| 2974 | 235 system_fcn_file = 1; |
| 236 } | |
| 237 else | |
| 238 system_fcn_file = 0; | |
| 239 } | |
| 240 | |
| 241 bool | |
| 242 octave_user_function::takes_varargs (void) const | |
| 243 { | |
| 244 return (param_list && param_list->takes_varargs ()); | |
| 245 } | |
| 246 | |
| 5848 | 247 bool |
| 248 octave_user_function::takes_var_return (void) const | |
| 2974 | 249 { |
| 5848 | 250 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 251 } |
| 252 | |
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253 void |
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254 octave_user_function::lock_subfunctions (void) |
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255 { |
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256 symbol_table::lock_subfunctions (local_scope); |
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257 } |
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258 |
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259 void |
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260 octave_user_function::unlock_subfunctions (void) |
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261 { |
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262 symbol_table::unlock_subfunctions (local_scope); |
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263 } |
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264 |
| 2974 | 265 octave_value_list |
| 266 octave_user_function::octave_all_va_args (void) | |
| 267 { | |
| 268 octave_value_list retval; | |
| 269 | |
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270 octave_idx_type n = num_args_passed - num_named_args; |
| 2974 | 271 |
| 3178 | 272 if (n > 0) |
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273 retval = args_passed.slice (num_named_args, n); |
| 2974 | 274 |
| 275 return retval; | |
| 276 } | |
| 277 | |
| 278 static void | |
| 3239 | 279 clear_param_list (void *lst) |
| 280 { | |
| 281 tree_parameter_list *tmp = static_cast<tree_parameter_list *> (lst); | |
| 282 | |
| 283 if (tmp) | |
| 4219 | 284 tmp->undefine (); |
| 3239 | 285 } |
| 286 | |
| 287 static void | |
| 3875 | 288 restore_args_passed (void *fcn) |
| 3239 | 289 { |
| 290 octave_user_function *tmp = static_cast<octave_user_function *> (fcn); | |
| 291 | |
| 292 if (tmp) | |
| 3875 | 293 tmp->restore_args_passed (); |
| 3239 | 294 } |
| 295 | |
| 2974 | 296 octave_value_list |
| 4247 | 297 octave_user_function::subsref (const std::string& type, |
| 4219 | 298 const std::list<octave_value_list>& idx, |
| 3933 | 299 int nargout) |
| 300 { | |
| 301 octave_value_list retval; | |
| 302 | |
| 303 switch (type[0]) | |
| 304 { | |
| 305 case '(': | |
| 5154 | 306 { |
| 5155 | 307 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 308 |
| 309 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 310 } | |
| 3933 | 311 break; |
| 312 | |
| 313 case '{': | |
| 314 case '.': | |
| 315 { | |
| 316 std::string nm = type_name (); | |
| 317 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 318 } | |
| 319 break; | |
| 320 | |
| 321 default: | |
| 322 panic_impossible (); | |
| 323 } | |
| 324 | |
| 5775 | 325 // FIXME -- perhaps there should be an |
| 4059 | 326 // octave_value_list::next_subsref member function? See also |
| 327 // octave_builtin::subsref. | |
| 3933 | 328 |
| 4219 | 329 if (idx.size () > 1) |
| 4994 | 330 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 331 |
| 332 return retval; | |
| 3933 | 333 } |
| 334 | |
| 335 octave_value_list | |
| 3544 | 336 octave_user_function::do_multi_index_op (int nargout, |
| 337 const octave_value_list& args) | |
| 2974 | 338 { |
| 339 octave_value_list retval; | |
| 340 | |
| 341 if (error_state) | |
| 342 return retval; | |
| 343 | |
| 344 if (! cmd_list) | |
| 345 return retval; | |
| 346 | |
| 347 int nargin = args.length (); | |
| 348 | |
| 4987 | 349 unwind_protect::begin_frame ("user_func_eval"); |
| 2974 | 350 |
| 351 unwind_protect_int (call_depth); | |
| 352 call_depth++; | |
| 353 | |
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354 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 355 { |
| 356 ::error ("max_recursion_limit exceeded"); | |
| 4987 | 357 unwind_protect::run_frame ("user_func_eval"); |
| 3131 | 358 return retval; |
| 359 } | |
| 360 | |
| 7336 | 361 // Save old and set current symbol table context, for |
| 362 // eval_undefined_error(). | |
| 363 | |
| 364 symbol_table::push_scope (local_scope); | |
| 365 unwind_protect::add (symbol_table::pop_scope); | |
| 2974 | 366 |
| 7901 | 367 octave_call_stack::push (this, local_scope, call_depth); |
| 368 unwind_protect::add (octave_call_stack::unwind_pop, 0); | |
| 369 | |
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370 if (call_depth > 0) |
| 2974 | 371 { |
| 7336 | 372 symbol_table::push_context (); |
| 2974 | 373 |
| 7336 | 374 unwind_protect::add (symbol_table::pop_context); |
| 375 } | |
| 2974 | 376 |
| 3875 | 377 // Save and restore args passed for recursive calls. |
| 2974 | 378 |
| 3875 | 379 save_args_passed (args); |
| 3239 | 380 |
| 3875 | 381 unwind_protect::add (::restore_args_passed, this); |
| 3239 | 382 |
| 2974 | 383 string_vector arg_names = args.name_tags (); |
| 384 | |
| 385 unwind_protect_int (num_args_passed); | |
| 386 num_args_passed = nargin; | |
| 387 | |
| 388 if (param_list && ! param_list->varargs_only ()) | |
| 389 { | |
| 390 param_list->define_from_arg_vector (args); | |
| 391 if (error_state) | |
| 392 goto abort; | |
| 393 } | |
| 394 | |
| 3239 | 395 // Force parameter list to be undefined when this function exits. |
| 396 // Doing so decrements the reference counts on the values of local | |
| 397 // variables that are also named function parameters. | |
| 398 | |
| 399 unwind_protect::add (clear_param_list, param_list); | |
| 400 | |
| 401 // Force return list to be undefined when this function exits. | |
| 402 // Doing so decrements the reference counts on the values of local | |
| 403 // variables that are also named values returned by this function. | |
| 404 | |
| 405 unwind_protect::add (clear_param_list, ret_list); | |
| 406 | |
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407 if (call_depth == 0) |
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408 { |
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409 // Force symbols to be undefined again when this function |
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410 // exits. |
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411 // |
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412 // This cleanup function is added to the unwind_protect stack |
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413 // after the calls to clear the parameter lists so that local |
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414 // variables will be cleared before the parameter lists are |
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415 // cleared. That way, any function parameters that have been |
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416 // declared global will be unmarked as global before they are |
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417 // undefined by the clear_param_list cleanup function. |
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418 |
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419 unwind_protect::add (symbol_table::clear_variables); |
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420 } |
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421 |
| 2974 | 422 // The following code is in a separate scope to avoid warnings from |
| 423 // G++ about `goto abort' crossing the initialization of some | |
| 424 // variables. | |
| 425 | |
| 426 { | |
| 3974 | 427 bind_automatic_vars (arg_names, nargin, nargout, octave_all_va_args ()); |
| 2974 | 428 |
| 429 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 430 | |
| 431 if (echo_commands) | |
| 432 print_code_function_header (); | |
| 433 | |
| 434 // Evaluate the commands that make up the function. | |
| 435 | |
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436 unwind_protect_bool (tree_evaluator::in_fcn_or_script_body); |
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437 tree_evaluator::in_fcn_or_script_body = true; |
| 3489 | 438 |
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439 bool special_expr = (is_inline_function () |
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440 || cmd_list->is_anon_function_body ()); |
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441 |
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442 if (special_expr) |
| 6657 | 443 { |
| 444 assert (cmd_list->length () == 1); | |
| 445 | |
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446 tree_statement *stmt = 0; |
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447 |
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448 if ((stmt = cmd_list->front ()) |
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449 && stmt->is_expression ()) |
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450 { |
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451 tree_expression *expr = stmt->expression (); |
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452 |
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453 retval = expr->rvalue (nargout); |
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454 } |
| 6657 | 455 } |
| 456 else | |
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457 cmd_list->accept (*current_evaluator); |
| 2974 | 458 |
| 459 if (echo_commands) | |
| 460 print_code_function_trailer (); | |
| 461 | |
| 4207 | 462 if (tree_return_command::returning) |
| 463 tree_return_command::returning = 0; | |
| 2974 | 464 |
| 4207 | 465 if (tree_break_command::breaking) |
| 466 tree_break_command::breaking--; | |
| 2974 | 467 |
| 468 if (error_state) | |
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469 { |
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470 octave_call_stack::backtrace_error_message (); |
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471 goto abort; |
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472 } |
| 2974 | 473 |
| 474 // Copy return values out. | |
| 475 | |
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476 if (ret_list && ! special_expr) |
| 3871 | 477 { |
| 4748 | 478 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 479 |
| 5848 | 480 Cell varargout; |
| 481 | |
| 6591 | 482 if (ret_list->takes_varargs ()) |
| 5848 | 483 { |
| 7336 | 484 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 485 |
| 7336 | 486 if (varargout_varval.is_defined ()) |
| 6591 | 487 { |
| 7336 | 488 varargout = varargout_varval.cell_value (); |
| 5848 | 489 |
| 6591 | 490 if (error_state) |
| 491 error ("expecting varargout to be a cell array object"); | |
| 492 } | |
| 5848 | 493 } |
| 494 | |
| 495 if (! error_state) | |
| 496 retval = ret_list->convert_to_const_vector (varargout); | |
| 3871 | 497 } |
| 2974 | 498 } |
| 499 | |
| 500 abort: | |
| 4987 | 501 unwind_protect::run_frame ("user_func_eval"); |
| 2974 | 502 |
| 503 return retval; | |
| 504 } | |
| 505 | |
| 506 void | |
| 507 octave_user_function::accept (tree_walker& tw) | |
| 508 { | |
| 509 tw.visit_octave_user_function (*this); | |
| 510 } | |
| 511 | |
| 7336 | 512 #if 0 |
| 2974 | 513 void |
| 3933 | 514 octave_user_function::print_symtab_info (std::ostream& os) const |
| 515 { | |
| 7336 | 516 symbol_table::print_info (os, local_scope); |
| 3933 | 517 } |
| 7336 | 518 #endif |
| 3933 | 519 |
| 520 void | |
| 2974 | 521 octave_user_function::print_code_function_header (void) |
| 522 { | |
| 5794 | 523 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 524 |
| 525 tpc.visit_octave_user_function_header (*this); | |
| 526 } | |
| 527 | |
| 528 void | |
| 529 octave_user_function::print_code_function_trailer (void) | |
| 530 { | |
| 5794 | 531 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 532 |
| 533 tpc.visit_octave_user_function_trailer (*this); | |
| 534 } | |
| 535 | |
| 536 void | |
| 537 octave_user_function::bind_automatic_vars | |
| 3974 | 538 (const string_vector& arg_names, int nargin, int nargout, |
| 539 const octave_value_list& va_args) | |
| 2974 | 540 { |
| 541 if (! arg_names.empty ()) | |
| 7336 | 542 symbol_table::varref ("argn") = arg_names; |
| 2974 | 543 |
| 7336 | 544 symbol_table::varref (".nargin.") = nargin; |
| 545 symbol_table::varref (".nargout.") = nargout; | |
| 546 | |
| 547 symbol_table::mark_hidden (".nargin."); | |
| 548 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 549 |
| 550 if (takes_varargs ()) | |
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551 symbol_table::varref ("varargin") = va_args.cell_value (); |
| 2974 | 552 } |
| 553 | |
| 4700 | 554 DEFUN (nargin, args, , |
| 555 "-*- texinfo -*-\n\ | |
| 556 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 557 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 558 Within a function, return the number of arguments passed to the function.\n\ | |
| 559 At the top level, return the number of command line arguments passed to\n\ | |
| 560 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 561 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 562 function accepts a variable number of arguments.\n\ | |
| 5642 | 563 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 564 @end deftypefn") |
| 565 { | |
| 566 octave_value retval; | |
| 567 | |
| 568 int nargin = args.length (); | |
| 569 | |
| 570 if (nargin == 1) | |
| 571 { | |
| 572 std::string fname = args(0).string_value (); | |
| 573 | |
| 574 if (! error_state) | |
| 575 { | |
| 7336 | 576 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 577 |
| 578 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 579 |
| 580 if (fcn) | |
| 581 { | |
| 582 if (fcn->takes_varargs ()) | |
| 583 retval = -1; | |
| 584 else | |
| 585 { | |
| 586 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 587 | |
| 588 retval = param_list ? param_list->length () : 0; | |
| 589 } | |
| 590 } | |
| 591 else | |
| 592 error ("nargin: invalid function"); | |
| 593 } | |
| 594 else | |
| 595 error ("nargin: expecting string as first argument"); | |
| 596 } | |
| 597 else if (nargin == 0) | |
| 598 { | |
| 7336 | 599 retval = symbol_table::varval (".nargin."); |
| 4700 | 600 |
| 7336 | 601 if (retval.is_undefined ()) |
| 602 retval = 0; | |
| 4700 | 603 } |
| 604 else | |
| 5823 | 605 print_usage (); |
| 4700 | 606 |
| 607 return retval; | |
| 608 } | |
| 609 | |
| 610 DEFUN (nargout, args, , | |
| 611 "-*- texinfo -*-\n\ | |
| 612 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 613 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 614 Within a function, return the number of values the caller expects to\n\ | |
| 615 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 616 maximum number of values the named function can produce, or -1 if the\n\ | |
| 617 function can produce a variable number of values.\n\ | |
| 618 \n\ | |
| 619 For example,\n\ | |
| 620 \n\ | |
| 621 @example\n\ | |
| 622 f ()\n\ | |
| 623 @end example\n\ | |
| 624 \n\ | |
| 625 @noindent\n\ | |
| 4704 | 626 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 627 \n\ |
| 628 @example\n\ | |
| 629 [s, t] = f ()\n\ | |
| 630 @end example\n\ | |
| 631 \n\ | |
| 632 @noindent\n\ | |
| 633 will cause @code{nargout} to return 2 inside the function\n\ | |
| 634 @code{f}.\n\ | |
| 635 \n\ | |
| 636 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 637 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 638 @end deftypefn") |
| 639 { | |
| 640 octave_value retval; | |
| 641 | |
| 642 int nargin = args.length (); | |
| 643 | |
| 644 if (nargin == 1) | |
| 645 { | |
| 646 std::string fname = args(0).string_value (); | |
| 647 | |
| 648 if (! error_state) | |
| 649 { | |
| 7336 | 650 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 651 |
| 652 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 653 |
| 654 if (fcn) | |
| 655 { | |
| 656 if (fcn->takes_var_return ()) | |
| 657 retval = -1; | |
| 658 else | |
| 659 { | |
| 660 tree_parameter_list *ret_list = fcn->return_list (); | |
| 661 | |
| 662 retval = ret_list ? ret_list->length () : 0; | |
| 663 } | |
| 664 } | |
| 665 else | |
| 666 error ("nargout: invalid function"); | |
| 667 } | |
| 668 else | |
| 669 error ("nargout: expecting string as first argument"); | |
| 670 } | |
| 671 else if (nargin == 0) | |
| 672 { | |
| 7336 | 673 if (! symbol_table::at_top_level ()) |
| 4700 | 674 { |
| 7336 | 675 retval = symbol_table::varval (".nargout."); |
| 4700 | 676 |
| 7336 | 677 if (retval.is_undefined ()) |
| 678 retval = 0; | |
| 4700 | 679 } |
| 680 else | |
| 681 error ("nargout: invalid call at top level"); | |
| 682 } | |
| 683 else | |
| 5823 | 684 print_usage (); |
| 4700 | 685 |
| 686 return retval; | |
| 687 } | |
| 688 | |
| 5794 | 689 DEFUN (max_recursion_depth, args, nargout, |
| 690 "-*- texinfo -*-\n\ | |
| 691 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 692 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 693 Query or set the internal limit on the number of times a function may\n\ | |
| 694 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 695 printed and control returns to the top level.\n\ | |
| 696 @end deftypefn") | |
| 3131 | 697 { |
| 5794 | 698 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 699 } |
| 700 | |
| 701 /* | |
| 702 ;;; Local Variables: *** | |
| 703 ;;; mode: C++ *** | |
| 704 ;;; End: *** | |
| 705 */ |