Mercurial > octave-nkf
annotate src/ov-usr-fcn.cc @ 7901:3e4c9b69069d
call stack changes
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Tue, 08 Jul 2008 12:00:32 -0400 |
| parents | 5adeea5de26c |
| children | 0d607e8dbbfa |
| 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 | |
| 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 (-1), |
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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 | |
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275 void |
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276 octave_user_function::lock_subfunctions (void) |
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277 { |
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278 symbol_table::lock_subfunctions (local_scope); |
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279 } |
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280 |
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281 void |
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282 octave_user_function::unlock_subfunctions (void) |
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283 { |
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284 symbol_table::unlock_subfunctions (local_scope); |
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285 } |
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286 |
| 2974 | 287 octave_value_list |
| 288 octave_user_function::octave_all_va_args (void) | |
| 289 { | |
| 290 octave_value_list retval; | |
| 291 | |
| 3178 | 292 int n = num_args_passed - num_named_args; |
| 2974 | 293 |
| 3178 | 294 if (n > 0) |
| 295 { | |
| 296 retval.resize (n); | |
| 297 | |
| 298 int k = 0; | |
| 299 for (int i = num_named_args; i < num_args_passed; i++) | |
| 300 retval(k++) = args_passed(i); | |
| 301 } | |
| 2974 | 302 |
| 303 return retval; | |
| 304 } | |
| 305 | |
| 306 static void | |
| 3239 | 307 clear_param_list (void *lst) |
| 308 { | |
| 309 tree_parameter_list *tmp = static_cast<tree_parameter_list *> (lst); | |
| 310 | |
| 311 if (tmp) | |
| 4219 | 312 tmp->undefine (); |
| 3239 | 313 } |
| 314 | |
| 315 static void | |
| 3875 | 316 restore_args_passed (void *fcn) |
| 3239 | 317 { |
| 318 octave_user_function *tmp = static_cast<octave_user_function *> (fcn); | |
| 319 | |
| 320 if (tmp) | |
| 3875 | 321 tmp->restore_args_passed (); |
| 3239 | 322 } |
| 323 | |
| 2974 | 324 octave_value_list |
| 4247 | 325 octave_user_function::subsref (const std::string& type, |
| 4219 | 326 const std::list<octave_value_list>& idx, |
| 3933 | 327 int nargout) |
| 328 { | |
| 329 octave_value_list retval; | |
| 330 | |
| 331 switch (type[0]) | |
| 332 { | |
| 333 case '(': | |
| 5154 | 334 { |
| 5155 | 335 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 336 |
| 337 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 338 } | |
| 3933 | 339 break; |
| 340 | |
| 341 case '{': | |
| 342 case '.': | |
| 343 { | |
| 344 std::string nm = type_name (); | |
| 345 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 346 } | |
| 347 break; | |
| 348 | |
| 349 default: | |
| 350 panic_impossible (); | |
| 351 } | |
| 352 | |
| 5775 | 353 // FIXME -- perhaps there should be an |
| 4059 | 354 // octave_value_list::next_subsref member function? See also |
| 355 // octave_builtin::subsref. | |
| 3933 | 356 |
| 4219 | 357 if (idx.size () > 1) |
| 4994 | 358 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 359 |
| 360 return retval; | |
| 3933 | 361 } |
| 362 | |
| 363 octave_value_list | |
| 3544 | 364 octave_user_function::do_multi_index_op (int nargout, |
| 365 const octave_value_list& args) | |
| 2974 | 366 { |
| 367 octave_value_list retval; | |
| 368 | |
| 369 if (error_state) | |
| 370 return retval; | |
| 371 | |
| 372 if (! cmd_list) | |
| 373 return retval; | |
| 374 | |
| 375 int nargin = args.length (); | |
| 376 | |
| 4987 | 377 unwind_protect::begin_frame ("user_func_eval"); |
| 2974 | 378 |
| 379 unwind_protect_int (call_depth); | |
| 380 call_depth++; | |
| 381 | |
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382 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 383 { |
| 384 ::error ("max_recursion_limit exceeded"); | |
| 4987 | 385 unwind_protect::run_frame ("user_func_eval"); |
| 3131 | 386 return retval; |
| 387 } | |
| 388 | |
| 7336 | 389 // Save old and set current symbol table context, for |
| 390 // eval_undefined_error(). | |
| 391 | |
| 392 symbol_table::push_scope (local_scope); | |
| 393 unwind_protect::add (symbol_table::pop_scope); | |
| 2974 | 394 |
| 7901 | 395 octave_call_stack::push (this, local_scope, call_depth); |
| 396 unwind_protect::add (octave_call_stack::unwind_pop, 0); | |
| 397 | |
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398 if (call_depth > 0) |
| 2974 | 399 { |
| 7336 | 400 symbol_table::push_context (); |
| 2974 | 401 |
| 7336 | 402 unwind_protect::add (symbol_table::pop_context); |
| 403 } | |
| 404 else | |
| 405 { | |
| 406 // Force symbols to be undefined again when this function exits. | |
| 407 unwind_protect::add (symbol_table::clear_variables); | |
| 408 } | |
| 2974 | 409 |
| 6149 | 410 if (! (is_nested_function () || is_inline_function ())) |
| 4238 | 411 { |
| 412 unwind_protect_ptr (curr_parent_function); | |
| 413 curr_parent_function = this; | |
| 414 } | |
| 415 | |
| 3875 | 416 // Save and restore args passed for recursive calls. |
| 2974 | 417 |
| 3875 | 418 save_args_passed (args); |
| 3239 | 419 |
| 3875 | 420 unwind_protect::add (::restore_args_passed, this); |
| 3239 | 421 |
| 2974 | 422 string_vector arg_names = args.name_tags (); |
| 423 | |
| 424 unwind_protect_int (num_args_passed); | |
| 425 num_args_passed = nargin; | |
| 426 | |
| 427 if (param_list && ! param_list->varargs_only ()) | |
| 428 { | |
| 429 param_list->define_from_arg_vector (args); | |
| 430 if (error_state) | |
| 431 goto abort; | |
| 432 } | |
| 433 | |
| 3239 | 434 // Force parameter list to be undefined when this function exits. |
| 435 // Doing so decrements the reference counts on the values of local | |
| 436 // variables that are also named function parameters. | |
| 437 | |
| 438 unwind_protect::add (clear_param_list, param_list); | |
| 439 | |
| 440 // Force return list to be undefined when this function exits. | |
| 441 // Doing so decrements the reference counts on the values of local | |
| 442 // variables that are also named values returned by this function. | |
| 443 | |
| 444 unwind_protect::add (clear_param_list, ret_list); | |
| 445 | |
| 2974 | 446 // The following code is in a separate scope to avoid warnings from |
| 447 // G++ about `goto abort' crossing the initialization of some | |
| 448 // variables. | |
| 449 | |
| 450 { | |
| 3974 | 451 bind_automatic_vars (arg_names, nargin, nargout, octave_all_va_args ()); |
| 2974 | 452 |
| 453 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 454 | |
| 455 if (echo_commands) | |
| 456 print_code_function_header (); | |
| 457 | |
| 458 // Evaluate the commands that make up the function. | |
| 459 | |
| 3489 | 460 unwind_protect_bool (evaluating_function_body); |
| 461 evaluating_function_body = true; | |
| 462 | |
| 6657 | 463 if (is_inline_function ()) |
| 464 { | |
| 465 assert (cmd_list->length () == 1); | |
| 466 | |
| 467 retval = cmd_list->eval (false, nargout); | |
| 468 } | |
| 469 else | |
| 470 cmd_list->eval (); | |
| 2974 | 471 |
| 472 if (echo_commands) | |
| 473 print_code_function_trailer (); | |
| 474 | |
| 4207 | 475 if (tree_return_command::returning) |
| 476 tree_return_command::returning = 0; | |
| 2974 | 477 |
| 4207 | 478 if (tree_break_command::breaking) |
| 479 tree_break_command::breaking--; | |
| 2974 | 480 |
| 481 if (error_state) | |
| 482 { | |
| 483 traceback_error (); | |
| 484 goto abort; | |
| 485 } | |
| 486 | |
| 487 // Copy return values out. | |
| 488 | |
| 6657 | 489 if (ret_list && ! is_inline_function ()) |
| 3871 | 490 { |
| 4748 | 491 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 492 |
| 5848 | 493 Cell varargout; |
| 494 | |
| 6591 | 495 if (ret_list->takes_varargs ()) |
| 5848 | 496 { |
| 7336 | 497 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 498 |
| 7336 | 499 if (varargout_varval.is_defined ()) |
| 6591 | 500 { |
| 7336 | 501 varargout = varargout_varval.cell_value (); |
| 5848 | 502 |
| 6591 | 503 if (error_state) |
| 504 error ("expecting varargout to be a cell array object"); | |
| 505 } | |
| 5848 | 506 } |
| 507 | |
| 508 if (! error_state) | |
| 509 retval = ret_list->convert_to_const_vector (varargout); | |
| 3871 | 510 } |
| 2974 | 511 } |
| 512 | |
| 513 abort: | |
| 4987 | 514 unwind_protect::run_frame ("user_func_eval"); |
| 2974 | 515 |
| 516 return retval; | |
| 517 } | |
| 518 | |
| 519 void | |
| 4346 | 520 octave_user_function::traceback_error (void) const |
| 2974 | 521 { |
| 522 if (error_state >= 0) | |
| 523 error_state = -1; | |
| 524 | |
| 4748 | 525 if (my_name.empty ()) |
| 2974 | 526 { |
| 527 if (file_name.empty ()) | |
| 528 ::error ("called from `?unknown?'"); | |
| 529 else | |
| 530 ::error ("called from file `%s'", file_name.c_str ()); | |
| 531 } | |
| 532 else | |
| 533 { | |
| 534 if (file_name.empty ()) | |
| 4748 | 535 ::error ("called from `%s'", my_name.c_str ()); |
| 2974 | 536 else |
| 537 ::error ("called from `%s' in file `%s'", | |
| 4748 | 538 my_name.c_str (), file_name.c_str ()); |
| 2974 | 539 } |
| 540 } | |
| 541 | |
| 542 void | |
| 543 octave_user_function::accept (tree_walker& tw) | |
| 544 { | |
| 545 tw.visit_octave_user_function (*this); | |
| 546 } | |
| 547 | |
| 7336 | 548 #if 0 |
| 2974 | 549 void |
| 3933 | 550 octave_user_function::print_symtab_info (std::ostream& os) const |
| 551 { | |
| 7336 | 552 symbol_table::print_info (os, local_scope); |
| 3933 | 553 } |
| 7336 | 554 #endif |
| 3933 | 555 |
| 556 void | |
| 2974 | 557 octave_user_function::print_code_function_header (void) |
| 558 { | |
| 5794 | 559 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 560 |
| 561 tpc.visit_octave_user_function_header (*this); | |
| 562 } | |
| 563 | |
| 564 void | |
| 565 octave_user_function::print_code_function_trailer (void) | |
| 566 { | |
| 5794 | 567 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 568 |
| 569 tpc.visit_octave_user_function_trailer (*this); | |
| 570 } | |
| 571 | |
| 572 void | |
| 573 octave_user_function::bind_automatic_vars | |
| 3974 | 574 (const string_vector& arg_names, int nargin, int nargout, |
| 575 const octave_value_list& va_args) | |
| 2974 | 576 { |
| 577 if (! arg_names.empty ()) | |
| 7336 | 578 symbol_table::varref ("argn") = arg_names; |
| 2974 | 579 |
| 7336 | 580 symbol_table::varref (".nargin.") = nargin; |
| 581 symbol_table::varref (".nargout.") = nargout; | |
| 582 | |
| 583 symbol_table::mark_hidden (".nargin."); | |
| 584 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 585 |
| 586 if (takes_varargs ()) | |
| 587 { | |
| 588 int n = va_args.length (); | |
| 589 | |
| 590 Cell varargin (1, n); | |
| 591 | |
| 592 for (int i = 0; i < n; i++) | |
| 593 varargin(0,i) = va_args(i); | |
| 594 | |
| 7336 | 595 symbol_table::varref ("varargin") = varargin; |
| 3974 | 596 } |
| 2974 | 597 } |
| 598 | |
| 4700 | 599 DEFUN (nargin, args, , |
| 600 "-*- texinfo -*-\n\ | |
| 601 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 602 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 603 Within a function, return the number of arguments passed to the function.\n\ | |
| 604 At the top level, return the number of command line arguments passed to\n\ | |
| 605 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 606 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 607 function accepts a variable number of arguments.\n\ | |
| 5642 | 608 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 609 @end deftypefn") |
| 610 { | |
| 611 octave_value retval; | |
| 612 | |
| 613 int nargin = args.length (); | |
| 614 | |
| 615 if (nargin == 1) | |
| 616 { | |
| 617 std::string fname = args(0).string_value (); | |
| 618 | |
| 619 if (! error_state) | |
| 620 { | |
| 7336 | 621 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 622 |
| 623 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 624 |
| 625 if (fcn) | |
| 626 { | |
| 627 if (fcn->takes_varargs ()) | |
| 628 retval = -1; | |
| 629 else | |
| 630 { | |
| 631 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 632 | |
| 633 retval = param_list ? param_list->length () : 0; | |
| 634 } | |
| 635 } | |
| 636 else | |
| 637 error ("nargin: invalid function"); | |
| 638 } | |
| 639 else | |
| 640 error ("nargin: expecting string as first argument"); | |
| 641 } | |
| 642 else if (nargin == 0) | |
| 643 { | |
| 7336 | 644 retval = symbol_table::varval (".nargin."); |
| 4700 | 645 |
| 7336 | 646 if (retval.is_undefined ()) |
| 647 retval = 0; | |
| 4700 | 648 } |
| 649 else | |
| 5823 | 650 print_usage (); |
| 4700 | 651 |
| 652 return retval; | |
| 653 } | |
| 654 | |
| 655 DEFUN (nargout, args, , | |
| 656 "-*- texinfo -*-\n\ | |
| 657 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 658 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 659 Within a function, return the number of values the caller expects to\n\ | |
| 660 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 661 maximum number of values the named function can produce, or -1 if the\n\ | |
| 662 function can produce a variable number of values.\n\ | |
| 663 \n\ | |
| 664 For example,\n\ | |
| 665 \n\ | |
| 666 @example\n\ | |
| 667 f ()\n\ | |
| 668 @end example\n\ | |
| 669 \n\ | |
| 670 @noindent\n\ | |
| 4704 | 671 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 672 \n\ |
| 673 @example\n\ | |
| 674 [s, t] = f ()\n\ | |
| 675 @end example\n\ | |
| 676 \n\ | |
| 677 @noindent\n\ | |
| 678 will cause @code{nargout} to return 2 inside the function\n\ | |
| 679 @code{f}.\n\ | |
| 680 \n\ | |
| 681 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 682 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 683 @end deftypefn") |
| 684 { | |
| 685 octave_value retval; | |
| 686 | |
| 687 int nargin = args.length (); | |
| 688 | |
| 689 if (nargin == 1) | |
| 690 { | |
| 691 std::string fname = args(0).string_value (); | |
| 692 | |
| 693 if (! error_state) | |
| 694 { | |
| 7336 | 695 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 696 |
| 697 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 698 |
| 699 if (fcn) | |
| 700 { | |
| 701 if (fcn->takes_var_return ()) | |
| 702 retval = -1; | |
| 703 else | |
| 704 { | |
| 705 tree_parameter_list *ret_list = fcn->return_list (); | |
| 706 | |
| 707 retval = ret_list ? ret_list->length () : 0; | |
| 708 } | |
| 709 } | |
| 710 else | |
| 711 error ("nargout: invalid function"); | |
| 712 } | |
| 713 else | |
| 714 error ("nargout: expecting string as first argument"); | |
| 715 } | |
| 716 else if (nargin == 0) | |
| 717 { | |
| 7336 | 718 if (! symbol_table::at_top_level ()) |
| 4700 | 719 { |
| 7336 | 720 retval = symbol_table::varval (".nargout."); |
| 4700 | 721 |
| 7336 | 722 if (retval.is_undefined ()) |
| 723 retval = 0; | |
| 4700 | 724 } |
| 725 else | |
| 726 error ("nargout: invalid call at top level"); | |
| 727 } | |
| 728 else | |
| 5823 | 729 print_usage (); |
| 4700 | 730 |
| 731 return retval; | |
| 732 } | |
| 733 | |
| 5794 | 734 DEFUN (max_recursion_depth, args, nargout, |
| 735 "-*- texinfo -*-\n\ | |
| 736 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 737 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 738 Query or set the internal limit on the number of times a function may\n\ | |
| 739 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 740 printed and control returns to the top level.\n\ | |
| 741 @end deftypefn") | |
| 3131 | 742 { |
| 5794 | 743 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 744 } |
| 745 | |
| 746 /* | |
| 747 ;;; Local Variables: *** | |
| 748 ;;; mode: C++ *** | |
| 749 ;;; End: *** | |
| 750 */ |