Mercurial > hg > octave-lyh
annotate src/ov-usr-fcn.cc @ 9529:8e5009334661
partially revert e79470be3ecb
| author | Jaroslav Hajek <highegg@gmail.com> |
|---|---|
| date | Mon, 17 Aug 2009 13:09:12 +0200 |
| parents | e79470be3ecb |
| children | 8d79f36ebdde |
| rev | line source |
|---|---|
| 2974 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, |
| 8920 | 4 2006, 2007, 2008, 2009 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 // Whether to optimize subsasgn method calls. |
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56 static bool Voptimize_subsasgn_calls = true; |
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57 |
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58 // User defined scripts. |
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59 |
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60 DEFINE_OCTAVE_ALLOCATOR (octave_user_script); |
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61 |
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62 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_script, |
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63 "user-defined script", |
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64 "user-defined script"); |
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65 |
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66 octave_user_script::octave_user_script (void) |
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67 : octave_user_code (), cmd_list (0), file_name (), |
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68 t_parsed (static_cast<time_t> (0)), |
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69 t_checked (static_cast<time_t> (0)), |
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70 call_depth (-1) |
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71 { } |
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72 |
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73 octave_user_script::octave_user_script (const std::string& fnm, |
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74 const std::string& nm, |
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75 tree_statement_list *cmds, |
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76 const std::string& ds) |
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77 : octave_user_code (nm, ds), cmd_list (cmds), file_name (fnm), |
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78 t_parsed (static_cast<time_t> (0)), |
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79 t_checked (static_cast<time_t> (0)), |
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80 call_depth (-1) |
| 7736 | 81 { |
| 82 if (cmd_list) | |
| 83 cmd_list->mark_as_script_body (); | |
| 84 } | |
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85 |
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86 octave_user_script::octave_user_script (const std::string& fnm, |
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87 const std::string& nm, |
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88 const std::string& ds) |
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89 : octave_user_code (nm, ds), cmd_list (0), file_name (fnm), |
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90 t_parsed (static_cast<time_t> (0)), |
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91 t_checked (static_cast<time_t> (0)), |
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92 call_depth (-1) |
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93 { } |
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94 |
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95 octave_user_script::~octave_user_script (void) |
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96 { |
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97 delete cmd_list; |
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98 } |
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99 |
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100 octave_value_list |
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101 octave_user_script::subsref (const std::string&, |
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102 const std::list<octave_value_list>&, int) |
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103 { |
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104 octave_value_list retval; |
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105 |
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106 ::error ("invalid use of script in index expression"); |
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107 |
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108 return retval; |
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109 } |
| 7336 | 110 |
| 111 octave_value_list | |
| 112 octave_user_script::do_multi_index_op (int nargout, | |
| 113 const octave_value_list& args) | |
| 114 { | |
| 115 octave_value_list retval; | |
| 116 | |
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117 unwind_protect::frame_id_t uwp_frame = unwind_protect::begin_frame (); |
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118 |
| 7336 | 119 if (! error_state) |
| 120 { | |
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121 if (args.length () == 0 && nargout == 0) |
| 7336 | 122 { |
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123 if (cmd_list) |
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124 { |
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125 unwind_protect::protect_var (call_depth); |
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126 call_depth++; |
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127 |
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128 if (call_depth < Vmax_recursion_depth) |
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129 { |
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130 octave_call_stack::push (this); |
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131 |
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132 unwind_protect::add_fcn (octave_call_stack::pop); |
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133 |
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134 unwind_protect::protect_var (tree_evaluator::in_fcn_or_script_body); |
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135 tree_evaluator::in_fcn_or_script_body = true; |
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136 |
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137 cmd_list->accept (*current_evaluator); |
| 7336 | 138 |
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139 if (tree_return_command::returning) |
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140 tree_return_command::returning = 0; |
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141 |
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142 if (tree_break_command::breaking) |
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143 tree_break_command::breaking--; |
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144 |
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145 if (error_state) |
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146 octave_call_stack::backtrace_error_message (); |
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147 } |
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148 else |
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149 ::error ("max_recursion_limit exceeded"); |
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150 } |
| 7336 | 151 } |
| 152 else | |
| 153 error ("invalid call to script"); | |
| 154 } | |
| 155 | |
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156 unwind_protect::run_frame (uwp_frame); |
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157 |
| 7336 | 158 return retval; |
| 159 } | |
| 160 | |
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161 void |
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162 octave_user_script::accept (tree_walker& tw) |
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163 { |
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164 tw.visit_octave_user_script (*this); |
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165 } |
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166 |
| 2974 | 167 // User defined functions. |
| 168 | |
| 3219 | 169 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
| 2974 | 170 |
| 3219 | 171 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
| 4612 | 172 "user-defined function", |
| 3219 | 173 "user-defined function"); |
| 2974 | 174 |
| 175 // Ugh. This really needs to be simplified (code/data? | |
| 176 // extrinsic/intrinsic state?). | |
| 177 | |
| 178 octave_user_function::octave_user_function | |
| 7336 | 179 (symbol_table::scope_id sid, tree_parameter_list *pl, |
| 180 tree_parameter_list *rl, tree_statement_list *cl) | |
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181 : octave_user_code (std::string (), std::string ()), |
| 2974 | 182 param_list (pl), ret_list (rl), cmd_list (cl), |
| 7336 | 183 lead_comm (), trail_comm (), file_name (), |
| 6323 | 184 parent_name (), t_parsed (static_cast<time_t> (0)), |
| 3255 | 185 t_checked (static_cast<time_t> (0)), |
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186 system_fcn_file (false), call_depth (-1), |
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187 num_named_args (param_list ? param_list->length () : 0), |
| 7336 | 188 nested_function (false), inline_function (false), |
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189 class_constructor (false), class_method (false), |
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190 parent_scope (-1), local_scope (sid) |
| 7736 | 191 { |
| 192 if (cmd_list) | |
| 193 cmd_list->mark_as_function_body (); | |
| 194 } | |
| 2974 | 195 |
| 196 octave_user_function::~octave_user_function (void) | |
| 197 { | |
| 198 delete param_list; | |
| 199 delete ret_list; | |
| 200 delete cmd_list; | |
| 3665 | 201 delete lead_comm; |
| 202 delete trail_comm; | |
| 7336 | 203 |
| 204 symbol_table::erase_scope (local_scope); | |
| 2974 | 205 } |
| 206 | |
| 207 octave_user_function * | |
| 208 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 209 { | |
| 210 ret_list = t; | |
| 211 | |
| 212 return this; | |
| 213 } | |
| 214 | |
| 215 void | |
| 4343 | 216 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 217 { |
| 4343 | 218 file_name = nm; |
| 2974 | 219 } |
| 220 | |
| 221 void | |
| 222 octave_user_function::mark_as_system_fcn_file (void) | |
| 223 { | |
| 224 if (! file_name.empty ()) | |
| 225 { | |
| 226 // We really should stash the whole path to the file we found, | |
| 227 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 228 // FIXME |
| 2974 | 229 // |
| 230 // We probably also don't need to get the library directory | |
| 231 // every time, but since this function is only called when the | |
| 232 // function file is parsed, it probably doesn't matter that | |
| 233 // much. | |
| 234 | |
| 3523 | 235 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 236 |
| 3565 | 237 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
| 2974 | 238 system_fcn_file = 1; |
| 239 } | |
| 240 else | |
| 241 system_fcn_file = 0; | |
| 242 } | |
| 243 | |
| 244 bool | |
| 245 octave_user_function::takes_varargs (void) const | |
| 246 { | |
| 247 return (param_list && param_list->takes_varargs ()); | |
| 248 } | |
| 249 | |
| 5848 | 250 bool |
| 251 octave_user_function::takes_var_return (void) const | |
| 2974 | 252 { |
| 5848 | 253 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 254 } |
| 255 | |
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256 void |
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257 octave_user_function::lock_subfunctions (void) |
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258 { |
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259 symbol_table::lock_subfunctions (local_scope); |
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260 } |
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261 |
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262 void |
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263 octave_user_function::unlock_subfunctions (void) |
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264 { |
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265 symbol_table::unlock_subfunctions (local_scope); |
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266 } |
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267 |
| 2974 | 268 octave_value_list |
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269 octave_user_function::all_va_args (const octave_value_list& args) |
| 2974 | 270 { |
| 271 octave_value_list retval; | |
| 272 | |
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273 octave_idx_type n = args.length () - num_named_args; |
| 2974 | 274 |
| 3178 | 275 if (n > 0) |
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276 retval = args.slice (num_named_args, n); |
| 2974 | 277 |
| 278 return retval; | |
| 279 } | |
| 280 | |
| 281 octave_value_list | |
| 4247 | 282 octave_user_function::subsref (const std::string& type, |
| 4219 | 283 const std::list<octave_value_list>& idx, |
| 3933 | 284 int nargout) |
| 285 { | |
| 286 octave_value_list retval; | |
| 287 | |
| 288 switch (type[0]) | |
| 289 { | |
| 290 case '(': | |
| 5154 | 291 { |
| 5155 | 292 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 293 |
| 294 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 295 } | |
| 3933 | 296 break; |
| 297 | |
| 298 case '{': | |
| 299 case '.': | |
| 300 { | |
| 301 std::string nm = type_name (); | |
| 302 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 303 } | |
| 304 break; | |
| 305 | |
| 306 default: | |
| 307 panic_impossible (); | |
| 308 } | |
| 309 | |
| 5775 | 310 // FIXME -- perhaps there should be an |
| 4059 | 311 // octave_value_list::next_subsref member function? See also |
| 312 // octave_builtin::subsref. | |
| 3933 | 313 |
| 4219 | 314 if (idx.size () > 1) |
| 4994 | 315 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 316 |
| 317 return retval; | |
| 3933 | 318 } |
| 319 | |
| 320 octave_value_list | |
| 3544 | 321 octave_user_function::do_multi_index_op (int nargout, |
| 322 const octave_value_list& args) | |
| 2974 | 323 { |
| 324 octave_value_list retval; | |
| 325 | |
| 326 if (error_state) | |
| 327 return retval; | |
| 328 | |
| 329 if (! cmd_list) | |
| 330 return retval; | |
| 331 | |
| 332 int nargin = args.length (); | |
| 333 | |
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334 unwind_protect::frame_id_t uwp_frame = unwind_protect::begin_frame (); |
| 2974 | 335 |
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336 unwind_protect::protect_var (call_depth); |
| 2974 | 337 call_depth++; |
| 338 | |
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339 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 340 { |
| 341 ::error ("max_recursion_limit exceeded"); | |
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342 unwind_protect::run_frame (uwp_frame); |
| 3131 | 343 return retval; |
| 344 } | |
| 345 | |
| 7336 | 346 // Save old and set current symbol table context, for |
| 347 // eval_undefined_error(). | |
| 348 | |
| 7901 | 349 octave_call_stack::push (this, local_scope, call_depth); |
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350 unwind_protect::add_fcn (octave_call_stack::pop); |
| 7901 | 351 |
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352 if (call_depth > 0) |
| 2974 | 353 { |
| 7336 | 354 symbol_table::push_context (); |
| 2974 | 355 |
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356 unwind_protect::add_fcn (symbol_table::pop_context); |
| 7336 | 357 } |
| 2974 | 358 |
| 359 string_vector arg_names = args.name_tags (); | |
| 360 | |
| 361 if (param_list && ! param_list->varargs_only ()) | |
| 362 { | |
| 363 param_list->define_from_arg_vector (args); | |
| 364 if (error_state) | |
| 365 goto abort; | |
| 366 } | |
| 367 | |
| 3239 | 368 // Force parameter list to be undefined when this function exits. |
| 369 // Doing so decrements the reference counts on the values of local | |
| 370 // variables that are also named function parameters. | |
| 371 | |
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372 if (param_list) |
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373 unwind_protect::add_method (param_list, |
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374 &tree_parameter_list::undefine); |
| 3239 | 375 |
| 376 // Force return list to be undefined when this function exits. | |
| 377 // Doing so decrements the reference counts on the values of local | |
| 378 // variables that are also named values returned by this function. | |
| 379 | |
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380 if (ret_list) |
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381 unwind_protect::add_method (ret_list, |
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382 &tree_parameter_list::undefine); |
| 3239 | 383 |
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384 if (call_depth == 0) |
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385 { |
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386 // Force symbols to be undefined again when this function |
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387 // exits. |
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388 // |
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389 // This cleanup function is added to the unwind_protect stack |
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390 // after the calls to clear the parameter lists so that local |
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391 // variables will be cleared before the parameter lists are |
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392 // cleared. That way, any function parameters that have been |
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393 // declared global will be unmarked as global before they are |
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394 // undefined by the clear_param_list cleanup function. |
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395 |
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396 unwind_protect::add_fcn (symbol_table::clear_variables); |
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397 } |
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398 |
| 2974 | 399 // The following code is in a separate scope to avoid warnings from |
| 400 // G++ about `goto abort' crossing the initialization of some | |
| 401 // variables. | |
| 402 | |
| 403 { | |
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404 bind_automatic_vars (arg_names, nargin, nargout, all_va_args (args)); |
| 2974 | 405 |
| 406 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 407 | |
| 408 if (echo_commands) | |
| 409 print_code_function_header (); | |
| 410 | |
| 411 // Evaluate the commands that make up the function. | |
| 412 | |
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413 unwind_protect::protect_var (tree_evaluator::in_fcn_or_script_body); |
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414 tree_evaluator::in_fcn_or_script_body = true; |
| 3489 | 415 |
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416 bool special_expr = (is_inline_function () |
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417 || cmd_list->is_anon_function_body ()); |
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418 |
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419 if (special_expr) |
| 6657 | 420 { |
| 421 assert (cmd_list->length () == 1); | |
| 422 | |
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423 tree_statement *stmt = 0; |
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424 |
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425 if ((stmt = cmd_list->front ()) |
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426 && stmt->is_expression ()) |
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427 { |
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428 tree_expression *expr = stmt->expression (); |
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429 |
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430 retval = expr->rvalue (nargout); |
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431 } |
| 6657 | 432 } |
| 433 else | |
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434 cmd_list->accept (*current_evaluator); |
| 2974 | 435 |
| 436 if (echo_commands) | |
| 437 print_code_function_trailer (); | |
| 438 | |
| 4207 | 439 if (tree_return_command::returning) |
| 440 tree_return_command::returning = 0; | |
| 2974 | 441 |
| 4207 | 442 if (tree_break_command::breaking) |
| 443 tree_break_command::breaking--; | |
| 2974 | 444 |
| 445 if (error_state) | |
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446 { |
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447 octave_call_stack::backtrace_error_message (); |
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448 goto abort; |
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449 } |
| 2974 | 450 |
| 451 // Copy return values out. | |
| 452 | |
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453 if (ret_list && ! special_expr) |
| 3871 | 454 { |
| 4748 | 455 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 456 |
| 5848 | 457 Cell varargout; |
| 458 | |
| 6591 | 459 if (ret_list->takes_varargs ()) |
| 5848 | 460 { |
| 7336 | 461 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 462 |
| 7336 | 463 if (varargout_varval.is_defined ()) |
| 6591 | 464 { |
| 7336 | 465 varargout = varargout_varval.cell_value (); |
| 5848 | 466 |
| 6591 | 467 if (error_state) |
| 468 error ("expecting varargout to be a cell array object"); | |
| 469 } | |
| 5848 | 470 } |
| 471 | |
| 472 if (! error_state) | |
| 473 retval = ret_list->convert_to_const_vector (varargout); | |
| 3871 | 474 } |
| 2974 | 475 } |
| 476 | |
| 477 abort: | |
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478 unwind_protect::run_frame (uwp_frame); |
| 2974 | 479 |
| 480 return retval; | |
| 481 } | |
| 482 | |
| 483 void | |
| 484 octave_user_function::accept (tree_walker& tw) | |
| 485 { | |
| 486 tw.visit_octave_user_function (*this); | |
| 487 } | |
| 488 | |
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489 bool |
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490 octave_user_function::subsasgn_optimization_ok (void) |
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491 { |
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492 bool retval = false; |
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493 if (Voptimize_subsasgn_calls |
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494 && param_list->length () > 0 && ! param_list->varargs_only () |
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495 && ret_list->length () == 1 && ! ret_list->takes_varargs ()) |
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496 { |
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497 tree_identifier *par1 = param_list->front ()->ident (); |
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498 tree_identifier *ret1 = ret_list->front ()->ident (); |
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499 retval = par1->name () == ret1->name (); |
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500 } |
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501 |
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502 return retval; |
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503 } |
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504 |
| 7336 | 505 #if 0 |
| 2974 | 506 void |
| 3933 | 507 octave_user_function::print_symtab_info (std::ostream& os) const |
| 508 { | |
| 7336 | 509 symbol_table::print_info (os, local_scope); |
| 3933 | 510 } |
| 7336 | 511 #endif |
| 3933 | 512 |
| 513 void | |
| 2974 | 514 octave_user_function::print_code_function_header (void) |
| 515 { | |
| 5794 | 516 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 517 |
| 518 tpc.visit_octave_user_function_header (*this); | |
| 519 } | |
| 520 | |
| 521 void | |
| 522 octave_user_function::print_code_function_trailer (void) | |
| 523 { | |
| 5794 | 524 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 525 |
| 526 tpc.visit_octave_user_function_trailer (*this); | |
| 527 } | |
| 528 | |
| 529 void | |
| 530 octave_user_function::bind_automatic_vars | |
| 3974 | 531 (const string_vector& arg_names, int nargin, int nargout, |
| 532 const octave_value_list& va_args) | |
| 2974 | 533 { |
| 534 if (! arg_names.empty ()) | |
| 7336 | 535 symbol_table::varref ("argn") = arg_names; |
| 2974 | 536 |
| 7336 | 537 symbol_table::varref (".nargin.") = nargin; |
| 538 symbol_table::varref (".nargout.") = nargout; | |
| 539 | |
| 540 symbol_table::mark_hidden (".nargin."); | |
| 541 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 542 |
| 543 if (takes_varargs ()) | |
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544 symbol_table::varref ("varargin") = va_args.cell_value (); |
| 2974 | 545 } |
| 546 | |
| 4700 | 547 DEFUN (nargin, args, , |
| 548 "-*- texinfo -*-\n\ | |
| 549 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 550 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 551 Within a function, return the number of arguments passed to the function.\n\ | |
| 552 At the top level, return the number of command line arguments passed to\n\ | |
| 553 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 554 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 555 function accepts a variable number of arguments.\n\ | |
| 5642 | 556 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 557 @end deftypefn") |
| 558 { | |
| 559 octave_value retval; | |
| 560 | |
| 561 int nargin = args.length (); | |
| 562 | |
| 563 if (nargin == 1) | |
| 564 { | |
| 565 std::string fname = args(0).string_value (); | |
| 566 | |
| 567 if (! error_state) | |
| 568 { | |
| 7336 | 569 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 570 |
| 571 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 572 |
| 573 if (fcn) | |
| 574 { | |
| 575 if (fcn->takes_varargs ()) | |
| 576 retval = -1; | |
| 577 else | |
| 578 { | |
| 579 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 580 | |
| 581 retval = param_list ? param_list->length () : 0; | |
| 582 } | |
| 583 } | |
| 584 else | |
| 585 error ("nargin: invalid function"); | |
| 586 } | |
| 587 else | |
| 588 error ("nargin: expecting string as first argument"); | |
| 589 } | |
| 590 else if (nargin == 0) | |
| 591 { | |
| 7336 | 592 retval = symbol_table::varval (".nargin."); |
| 4700 | 593 |
| 7336 | 594 if (retval.is_undefined ()) |
| 595 retval = 0; | |
| 4700 | 596 } |
| 597 else | |
| 5823 | 598 print_usage (); |
| 4700 | 599 |
| 600 return retval; | |
| 601 } | |
| 602 | |
| 603 DEFUN (nargout, args, , | |
| 604 "-*- texinfo -*-\n\ | |
| 605 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 606 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 607 Within a function, return the number of values the caller expects to\n\ | |
| 608 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 609 maximum number of values the named function can produce, or -1 if the\n\ | |
| 610 function can produce a variable number of values.\n\ | |
| 611 \n\ | |
| 612 For example,\n\ | |
| 613 \n\ | |
| 614 @example\n\ | |
| 615 f ()\n\ | |
| 616 @end example\n\ | |
| 617 \n\ | |
| 618 @noindent\n\ | |
| 4704 | 619 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 620 \n\ |
| 621 @example\n\ | |
| 622 [s, t] = f ()\n\ | |
| 623 @end example\n\ | |
| 624 \n\ | |
| 625 @noindent\n\ | |
| 626 will cause @code{nargout} to return 2 inside the function\n\ | |
| 627 @code{f}.\n\ | |
| 628 \n\ | |
| 629 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 630 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 631 @end deftypefn") |
| 632 { | |
| 633 octave_value retval; | |
| 634 | |
| 635 int nargin = args.length (); | |
| 636 | |
| 637 if (nargin == 1) | |
| 638 { | |
| 639 std::string fname = args(0).string_value (); | |
| 640 | |
| 641 if (! error_state) | |
| 642 { | |
| 7336 | 643 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 644 |
| 645 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 646 |
| 647 if (fcn) | |
| 648 { | |
| 649 if (fcn->takes_var_return ()) | |
| 650 retval = -1; | |
| 651 else | |
| 652 { | |
| 653 tree_parameter_list *ret_list = fcn->return_list (); | |
| 654 | |
| 655 retval = ret_list ? ret_list->length () : 0; | |
| 656 } | |
| 657 } | |
| 658 else | |
| 659 error ("nargout: invalid function"); | |
| 660 } | |
| 661 else | |
| 662 error ("nargout: expecting string as first argument"); | |
| 663 } | |
| 664 else if (nargin == 0) | |
| 665 { | |
| 7336 | 666 if (! symbol_table::at_top_level ()) |
| 4700 | 667 { |
| 7336 | 668 retval = symbol_table::varval (".nargout."); |
| 4700 | 669 |
| 7336 | 670 if (retval.is_undefined ()) |
| 671 retval = 0; | |
| 4700 | 672 } |
| 673 else | |
| 674 error ("nargout: invalid call at top level"); | |
| 675 } | |
| 676 else | |
| 5823 | 677 print_usage (); |
| 4700 | 678 |
| 679 return retval; | |
| 680 } | |
| 681 | |
| 5794 | 682 DEFUN (max_recursion_depth, args, nargout, |
| 683 "-*- texinfo -*-\n\ | |
| 684 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 685 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 686 Query or set the internal limit on the number of times a function may\n\ | |
| 687 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 688 printed and control returns to the top level.\n\ | |
| 689 @end deftypefn") | |
| 3131 | 690 { |
| 5794 | 691 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 692 } |
| 693 | |
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694 DEFUN (optimize_subsasgn_calls, args, nargout, |
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695 "-*- texinfo -*-\n\ |
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696 @deftypefn {Built-in Function} {@var{val} =} optimize_subsasgn_calls ()\n\ |
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697 @deftypefnx {Built-in Function} {@var{old_val} =} optimize_subsasgn_calls (@var{new_val})\n\ |
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698 Query or set the internal flag for subsasgn method call optimizations.\n\ |
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699 If true, Octave will attempt to eliminate the redundant copying when calling\n\ |
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700 subsasgn method of a user-defined class.\n\ |
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701 @end deftypefn") |
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702 { |
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703 return SET_INTERNAL_VARIABLE (optimize_subsasgn_calls); |
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704 } |
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705 |
| 2974 | 706 /* |
| 707 ;;; Local Variables: *** | |
| 708 ;;; mode: C++ *** | |
| 709 ;;; End: *** | |
| 710 */ |