Mercurial > octave-nkf
annotate src/ov-usr-fcn.cc @ 7736:a059b5679fbb
implement dbstack
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 25 Apr 2008 15:11:03 -0400 |
| parents | 2d2a969c731c |
| children | 40c428ea3408 |
| 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 (0) |
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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 (0) |
| 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 (0) |
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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 | |
| 113 if (! error_state) | |
| 114 { | |
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115 if (args.length () == 0 && nargout == 0) |
| 7336 | 116 { |
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117 if (cmd_list) |
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118 { |
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119 unwind_protect::begin_frame ("user_script_eval"); |
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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 traceback_error (); |
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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 |
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144 unwind_protect::run_frame ("user_script_eval"); |
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145 } |
| 7336 | 146 } |
| 147 else | |
| 148 error ("invalid call to script"); | |
| 149 } | |
| 150 | |
| 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 |
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160 // FIXME -- this function is exactly the same as |
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161 // octave_user_function::traceback_error. |
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162 |
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163 void |
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164 octave_user_script::traceback_error (void) const |
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165 { |
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166 if (error_state >= 0) |
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167 error_state = -1; |
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168 |
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169 if (my_name.empty ()) |
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170 { |
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171 if (file_name.empty ()) |
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172 ::error ("called from `?unknown?'"); |
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173 else |
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174 ::error ("called from file `%s'", file_name.c_str ()); |
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175 } |
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176 else |
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177 { |
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178 if (file_name.empty ()) |
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179 ::error ("called from `%s'", my_name.c_str ()); |
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180 else |
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181 ::error ("called from `%s' in file `%s'", |
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182 my_name.c_str (), file_name.c_str ()); |
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183 } |
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184 } |
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185 |
| 2974 | 186 // User defined functions. |
| 187 | |
| 3219 | 188 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
| 2974 | 189 |
| 3219 | 190 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
| 4612 | 191 "user-defined function", |
| 3219 | 192 "user-defined function"); |
| 2974 | 193 |
| 194 // Ugh. This really needs to be simplified (code/data? | |
| 195 // extrinsic/intrinsic state?). | |
| 196 | |
| 197 octave_user_function::octave_user_function | |
| 7336 | 198 (symbol_table::scope_id sid, tree_parameter_list *pl, |
| 199 tree_parameter_list *rl, tree_statement_list *cl) | |
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200 : octave_user_code (std::string (), std::string ()), |
| 2974 | 201 param_list (pl), ret_list (rl), cmd_list (cl), |
| 7336 | 202 lead_comm (), trail_comm (), file_name (), |
| 6323 | 203 parent_name (), t_parsed (static_cast<time_t> (0)), |
| 3255 | 204 t_checked (static_cast<time_t> (0)), |
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205 system_fcn_file (false), call_depth (0), |
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206 num_named_args (param_list ? param_list->length () : 0), |
| 7336 | 207 nested_function (false), inline_function (false), |
| 208 class_constructor (false), class_method (false), xdispatch_class (), | |
| 209 args_passed (), num_args_passed (0), local_scope (sid) | |
| 7736 | 210 { |
| 211 if (cmd_list) | |
| 212 cmd_list->mark_as_function_body (); | |
| 213 } | |
| 2974 | 214 |
| 215 octave_user_function::~octave_user_function (void) | |
| 216 { | |
| 217 delete param_list; | |
| 218 delete ret_list; | |
| 219 delete cmd_list; | |
| 3665 | 220 delete lead_comm; |
| 221 delete trail_comm; | |
| 7336 | 222 |
| 223 symbol_table::erase_scope (local_scope); | |
| 2974 | 224 } |
| 225 | |
| 226 octave_user_function * | |
| 227 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 228 { | |
| 229 ret_list = t; | |
| 230 | |
| 231 return this; | |
| 232 } | |
| 233 | |
| 234 void | |
| 4343 | 235 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 236 { |
| 4343 | 237 file_name = nm; |
| 2974 | 238 } |
| 239 | |
| 240 void | |
| 241 octave_user_function::mark_as_system_fcn_file (void) | |
| 242 { | |
| 243 if (! file_name.empty ()) | |
| 244 { | |
| 245 // We really should stash the whole path to the file we found, | |
| 246 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 247 // FIXME |
| 2974 | 248 // |
| 249 // We probably also don't need to get the library directory | |
| 250 // every time, but since this function is only called when the | |
| 251 // function file is parsed, it probably doesn't matter that | |
| 252 // much. | |
| 253 | |
| 3523 | 254 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 255 |
| 3565 | 256 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
| 2974 | 257 system_fcn_file = 1; |
| 258 } | |
| 259 else | |
| 260 system_fcn_file = 0; | |
| 261 } | |
| 262 | |
| 263 bool | |
| 264 octave_user_function::takes_varargs (void) const | |
| 265 { | |
| 266 return (param_list && param_list->takes_varargs ()); | |
| 267 } | |
| 268 | |
| 5848 | 269 bool |
| 270 octave_user_function::takes_var_return (void) const | |
| 2974 | 271 { |
| 5848 | 272 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 273 } |
| 274 | |
| 275 octave_value_list | |
| 276 octave_user_function::octave_all_va_args (void) | |
| 277 { | |
| 278 octave_value_list retval; | |
| 279 | |
| 3178 | 280 int n = num_args_passed - num_named_args; |
| 2974 | 281 |
| 3178 | 282 if (n > 0) |
| 283 { | |
| 284 retval.resize (n); | |
| 285 | |
| 286 int k = 0; | |
| 287 for (int i = num_named_args; i < num_args_passed; i++) | |
| 288 retval(k++) = args_passed(i); | |
| 289 } | |
| 2974 | 290 |
| 291 return retval; | |
| 292 } | |
| 293 | |
| 294 static void | |
| 3239 | 295 clear_param_list (void *lst) |
| 296 { | |
| 297 tree_parameter_list *tmp = static_cast<tree_parameter_list *> (lst); | |
| 298 | |
| 299 if (tmp) | |
| 4219 | 300 tmp->undefine (); |
| 3239 | 301 } |
| 302 | |
| 303 static void | |
| 3875 | 304 restore_args_passed (void *fcn) |
| 3239 | 305 { |
| 306 octave_user_function *tmp = static_cast<octave_user_function *> (fcn); | |
| 307 | |
| 308 if (tmp) | |
| 3875 | 309 tmp->restore_args_passed (); |
| 3239 | 310 } |
| 311 | |
| 2974 | 312 octave_value_list |
| 4247 | 313 octave_user_function::subsref (const std::string& type, |
| 4219 | 314 const std::list<octave_value_list>& idx, |
| 3933 | 315 int nargout) |
| 316 { | |
| 317 octave_value_list retval; | |
| 318 | |
| 319 switch (type[0]) | |
| 320 { | |
| 321 case '(': | |
| 5154 | 322 { |
| 5155 | 323 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 324 |
| 325 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 326 } | |
| 3933 | 327 break; |
| 328 | |
| 329 case '{': | |
| 330 case '.': | |
| 331 { | |
| 332 std::string nm = type_name (); | |
| 333 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 334 } | |
| 335 break; | |
| 336 | |
| 337 default: | |
| 338 panic_impossible (); | |
| 339 } | |
| 340 | |
| 5775 | 341 // FIXME -- perhaps there should be an |
| 4059 | 342 // octave_value_list::next_subsref member function? See also |
| 343 // octave_builtin::subsref. | |
| 3933 | 344 |
| 4219 | 345 if (idx.size () > 1) |
| 4994 | 346 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 347 |
| 348 return retval; | |
| 3933 | 349 } |
| 350 | |
| 351 octave_value_list | |
| 3544 | 352 octave_user_function::do_multi_index_op (int nargout, |
| 353 const octave_value_list& args) | |
| 2974 | 354 { |
| 355 octave_value_list retval; | |
| 356 | |
| 357 if (error_state) | |
| 358 return retval; | |
| 359 | |
| 360 if (! cmd_list) | |
| 361 return retval; | |
| 362 | |
| 363 int nargin = args.length (); | |
| 364 | |
| 4987 | 365 unwind_protect::begin_frame ("user_func_eval"); |
| 2974 | 366 |
| 367 unwind_protect_int (call_depth); | |
| 368 call_depth++; | |
| 369 | |
| 3131 | 370 if (call_depth > Vmax_recursion_depth) |
| 371 { | |
| 372 ::error ("max_recursion_limit exceeded"); | |
| 4987 | 373 unwind_protect::run_frame ("user_func_eval"); |
| 3131 | 374 return retval; |
| 375 } | |
| 376 | |
| 7336 | 377 // Save old and set current symbol table context, for |
| 378 // eval_undefined_error(). | |
| 379 | |
| 380 symbol_table::push_scope (local_scope); | |
| 381 unwind_protect::add (symbol_table::pop_scope); | |
| 2974 | 382 |
| 383 if (call_depth > 1) | |
| 384 { | |
| 7336 | 385 symbol_table::push_context (); |
| 2974 | 386 |
| 7336 | 387 unwind_protect::add (symbol_table::pop_context); |
| 388 } | |
| 389 else | |
| 390 { | |
| 391 // Force symbols to be undefined again when this function exits. | |
| 392 unwind_protect::add (symbol_table::clear_variables); | |
| 393 } | |
| 2974 | 394 |
| 5743 | 395 octave_call_stack::push (this); |
| 396 | |
| 397 unwind_protect::add (octave_call_stack::unwind_pop, 0); | |
| 2974 | 398 |
| 6149 | 399 if (! (is_nested_function () || is_inline_function ())) |
| 4238 | 400 { |
| 401 unwind_protect_ptr (curr_parent_function); | |
| 402 curr_parent_function = this; | |
| 403 } | |
| 404 | |
| 3875 | 405 // Save and restore args passed for recursive calls. |
| 2974 | 406 |
| 3875 | 407 save_args_passed (args); |
| 3239 | 408 |
| 3875 | 409 unwind_protect::add (::restore_args_passed, this); |
| 3239 | 410 |
| 2974 | 411 string_vector arg_names = args.name_tags (); |
| 412 | |
| 413 unwind_protect_int (num_args_passed); | |
| 414 num_args_passed = nargin; | |
| 415 | |
| 416 if (param_list && ! param_list->varargs_only ()) | |
| 417 { | |
| 418 param_list->define_from_arg_vector (args); | |
| 419 if (error_state) | |
| 420 goto abort; | |
| 421 } | |
| 422 | |
| 3239 | 423 // Force parameter list to be undefined when this function exits. |
| 424 // Doing so decrements the reference counts on the values of local | |
| 425 // variables that are also named function parameters. | |
| 426 | |
| 427 unwind_protect::add (clear_param_list, param_list); | |
| 428 | |
| 429 // Force return list to be undefined when this function exits. | |
| 430 // Doing so decrements the reference counts on the values of local | |
| 431 // variables that are also named values returned by this function. | |
| 432 | |
| 433 unwind_protect::add (clear_param_list, ret_list); | |
| 434 | |
| 2974 | 435 // The following code is in a separate scope to avoid warnings from |
| 436 // G++ about `goto abort' crossing the initialization of some | |
| 437 // variables. | |
| 438 | |
| 439 { | |
| 3974 | 440 bind_automatic_vars (arg_names, nargin, nargout, octave_all_va_args ()); |
| 2974 | 441 |
| 442 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 443 | |
| 444 if (echo_commands) | |
| 445 print_code_function_header (); | |
| 446 | |
| 447 // Evaluate the commands that make up the function. | |
| 448 | |
| 3489 | 449 unwind_protect_bool (evaluating_function_body); |
| 450 evaluating_function_body = true; | |
| 451 | |
| 6657 | 452 if (is_inline_function ()) |
| 453 { | |
| 454 assert (cmd_list->length () == 1); | |
| 455 | |
| 456 retval = cmd_list->eval (false, nargout); | |
| 457 } | |
| 458 else | |
| 459 cmd_list->eval (); | |
| 2974 | 460 |
| 461 if (echo_commands) | |
| 462 print_code_function_trailer (); | |
| 463 | |
| 4207 | 464 if (tree_return_command::returning) |
| 465 tree_return_command::returning = 0; | |
| 2974 | 466 |
| 4207 | 467 if (tree_break_command::breaking) |
| 468 tree_break_command::breaking--; | |
| 2974 | 469 |
| 470 if (error_state) | |
| 471 { | |
| 472 traceback_error (); | |
| 473 goto abort; | |
| 474 } | |
| 475 | |
| 476 // Copy return values out. | |
| 477 | |
| 6657 | 478 if (ret_list && ! is_inline_function ()) |
| 3871 | 479 { |
| 4748 | 480 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 481 |
| 5848 | 482 Cell varargout; |
| 483 | |
| 6591 | 484 if (ret_list->takes_varargs ()) |
| 5848 | 485 { |
| 7336 | 486 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 487 |
| 7336 | 488 if (varargout_varval.is_defined ()) |
| 6591 | 489 { |
| 7336 | 490 varargout = varargout_varval.cell_value (); |
| 5848 | 491 |
| 6591 | 492 if (error_state) |
| 493 error ("expecting varargout to be a cell array object"); | |
| 494 } | |
| 5848 | 495 } |
| 496 | |
| 497 if (! error_state) | |
| 498 retval = ret_list->convert_to_const_vector (varargout); | |
| 3871 | 499 } |
| 2974 | 500 } |
| 501 | |
| 502 abort: | |
| 4987 | 503 unwind_protect::run_frame ("user_func_eval"); |
| 2974 | 504 |
| 505 return retval; | |
| 506 } | |
| 507 | |
| 508 void | |
| 4346 | 509 octave_user_function::traceback_error (void) const |
| 2974 | 510 { |
| 511 if (error_state >= 0) | |
| 512 error_state = -1; | |
| 513 | |
| 4748 | 514 if (my_name.empty ()) |
| 2974 | 515 { |
| 516 if (file_name.empty ()) | |
| 517 ::error ("called from `?unknown?'"); | |
| 518 else | |
| 519 ::error ("called from file `%s'", file_name.c_str ()); | |
| 520 } | |
| 521 else | |
| 522 { | |
| 523 if (file_name.empty ()) | |
| 4748 | 524 ::error ("called from `%s'", my_name.c_str ()); |
| 2974 | 525 else |
| 526 ::error ("called from `%s' in file `%s'", | |
| 4748 | 527 my_name.c_str (), file_name.c_str ()); |
| 2974 | 528 } |
| 529 } | |
| 530 | |
| 531 void | |
| 532 octave_user_function::accept (tree_walker& tw) | |
| 533 { | |
| 534 tw.visit_octave_user_function (*this); | |
| 535 } | |
| 536 | |
| 7336 | 537 #if 0 |
| 2974 | 538 void |
| 3933 | 539 octave_user_function::print_symtab_info (std::ostream& os) const |
| 540 { | |
| 7336 | 541 symbol_table::print_info (os, local_scope); |
| 3933 | 542 } |
| 7336 | 543 #endif |
| 3933 | 544 |
| 545 void | |
| 2974 | 546 octave_user_function::print_code_function_header (void) |
| 547 { | |
| 5794 | 548 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 549 |
| 550 tpc.visit_octave_user_function_header (*this); | |
| 551 } | |
| 552 | |
| 553 void | |
| 554 octave_user_function::print_code_function_trailer (void) | |
| 555 { | |
| 5794 | 556 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 557 |
| 558 tpc.visit_octave_user_function_trailer (*this); | |
| 559 } | |
| 560 | |
| 561 void | |
| 562 octave_user_function::bind_automatic_vars | |
| 3974 | 563 (const string_vector& arg_names, int nargin, int nargout, |
| 564 const octave_value_list& va_args) | |
| 2974 | 565 { |
| 566 if (! arg_names.empty ()) | |
| 7336 | 567 symbol_table::varref ("argn") = arg_names; |
| 2974 | 568 |
| 7336 | 569 symbol_table::varref (".nargin.") = nargin; |
| 570 symbol_table::varref (".nargout.") = nargout; | |
| 571 | |
| 572 symbol_table::mark_hidden (".nargin."); | |
| 573 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 574 |
| 575 if (takes_varargs ()) | |
| 576 { | |
| 577 int n = va_args.length (); | |
| 578 | |
| 579 Cell varargin (1, n); | |
| 580 | |
| 581 for (int i = 0; i < n; i++) | |
| 582 varargin(0,i) = va_args(i); | |
| 583 | |
| 7336 | 584 symbol_table::varref ("varargin") = varargin; |
| 3974 | 585 } |
| 2974 | 586 } |
| 587 | |
| 4700 | 588 DEFUN (nargin, args, , |
| 589 "-*- texinfo -*-\n\ | |
| 590 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 591 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 592 Within a function, return the number of arguments passed to the function.\n\ | |
| 593 At the top level, return the number of command line arguments passed to\n\ | |
| 594 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 595 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 596 function accepts a variable number of arguments.\n\ | |
| 5642 | 597 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 598 @end deftypefn") |
| 599 { | |
| 600 octave_value retval; | |
| 601 | |
| 602 int nargin = args.length (); | |
| 603 | |
| 604 if (nargin == 1) | |
| 605 { | |
| 606 std::string fname = args(0).string_value (); | |
| 607 | |
| 608 if (! error_state) | |
| 609 { | |
| 7336 | 610 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 611 |
| 612 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 613 |
| 614 if (fcn) | |
| 615 { | |
| 616 if (fcn->takes_varargs ()) | |
| 617 retval = -1; | |
| 618 else | |
| 619 { | |
| 620 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 621 | |
| 622 retval = param_list ? param_list->length () : 0; | |
| 623 } | |
| 624 } | |
| 625 else | |
| 626 error ("nargin: invalid function"); | |
| 627 } | |
| 628 else | |
| 629 error ("nargin: expecting string as first argument"); | |
| 630 } | |
| 631 else if (nargin == 0) | |
| 632 { | |
| 7336 | 633 retval = symbol_table::varval (".nargin."); |
| 4700 | 634 |
| 7336 | 635 if (retval.is_undefined ()) |
| 636 retval = 0; | |
| 4700 | 637 } |
| 638 else | |
| 5823 | 639 print_usage (); |
| 4700 | 640 |
| 641 return retval; | |
| 642 } | |
| 643 | |
| 644 DEFUN (nargout, args, , | |
| 645 "-*- texinfo -*-\n\ | |
| 646 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 647 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 648 Within a function, return the number of values the caller expects to\n\ | |
| 649 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 650 maximum number of values the named function can produce, or -1 if the\n\ | |
| 651 function can produce a variable number of values.\n\ | |
| 652 \n\ | |
| 653 For example,\n\ | |
| 654 \n\ | |
| 655 @example\n\ | |
| 656 f ()\n\ | |
| 657 @end example\n\ | |
| 658 \n\ | |
| 659 @noindent\n\ | |
| 4704 | 660 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 661 \n\ |
| 662 @example\n\ | |
| 663 [s, t] = f ()\n\ | |
| 664 @end example\n\ | |
| 665 \n\ | |
| 666 @noindent\n\ | |
| 667 will cause @code{nargout} to return 2 inside the function\n\ | |
| 668 @code{f}.\n\ | |
| 669 \n\ | |
| 670 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 671 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 672 @end deftypefn") |
| 673 { | |
| 674 octave_value retval; | |
| 675 | |
| 676 int nargin = args.length (); | |
| 677 | |
| 678 if (nargin == 1) | |
| 679 { | |
| 680 std::string fname = args(0).string_value (); | |
| 681 | |
| 682 if (! error_state) | |
| 683 { | |
| 7336 | 684 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 685 |
| 686 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 687 |
| 688 if (fcn) | |
| 689 { | |
| 690 if (fcn->takes_var_return ()) | |
| 691 retval = -1; | |
| 692 else | |
| 693 { | |
| 694 tree_parameter_list *ret_list = fcn->return_list (); | |
| 695 | |
| 696 retval = ret_list ? ret_list->length () : 0; | |
| 697 } | |
| 698 } | |
| 699 else | |
| 700 error ("nargout: invalid function"); | |
| 701 } | |
| 702 else | |
| 703 error ("nargout: expecting string as first argument"); | |
| 704 } | |
| 705 else if (nargin == 0) | |
| 706 { | |
| 7336 | 707 if (! symbol_table::at_top_level ()) |
| 4700 | 708 { |
| 7336 | 709 retval = symbol_table::varval (".nargout."); |
| 4700 | 710 |
| 7336 | 711 if (retval.is_undefined ()) |
| 712 retval = 0; | |
| 4700 | 713 } |
| 714 else | |
| 715 error ("nargout: invalid call at top level"); | |
| 716 } | |
| 717 else | |
| 5823 | 718 print_usage (); |
| 4700 | 719 |
| 720 return retval; | |
| 721 } | |
| 722 | |
| 5794 | 723 DEFUN (max_recursion_depth, args, nargout, |
| 724 "-*- texinfo -*-\n\ | |
| 725 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 726 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 727 Query or set the internal limit on the number of times a function may\n\ | |
| 728 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 729 printed and control returns to the top level.\n\ | |
| 730 @end deftypefn") | |
| 3131 | 731 { |
| 5794 | 732 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 733 } |
| 734 | |
| 735 /* | |
| 736 ;;; Local Variables: *** | |
| 737 ;;; mode: C++ *** | |
| 738 ;;; End: *** | |
| 739 */ |