Mercurial > hg > octave-lyh
annotate src/ov-usr-fcn.cc @ 9794:0d4613a736e9
convert build system to use automake and libtool
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Tue, 10 Nov 2009 15:02:25 -0500 |
| parents | b6f5a59a66d7 |
| children | 6918d86add73 |
| 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 (); | |
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194 |
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195 if (local_scope >= 0) |
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196 symbol_table::set_curr_fcn (this, local_scope); |
| 7736 | 197 } |
| 2974 | 198 |
| 199 octave_user_function::~octave_user_function (void) | |
| 200 { | |
| 201 delete param_list; | |
| 202 delete ret_list; | |
| 203 delete cmd_list; | |
| 3665 | 204 delete lead_comm; |
| 205 delete trail_comm; | |
| 7336 | 206 |
| 207 symbol_table::erase_scope (local_scope); | |
| 2974 | 208 } |
| 209 | |
| 210 octave_user_function * | |
| 211 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 212 { | |
| 213 ret_list = t; | |
| 214 | |
| 215 return this; | |
| 216 } | |
| 217 | |
| 218 void | |
| 4343 | 219 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 220 { |
| 4343 | 221 file_name = nm; |
| 2974 | 222 } |
| 223 | |
| 224 void | |
| 225 octave_user_function::mark_as_system_fcn_file (void) | |
| 226 { | |
| 227 if (! file_name.empty ()) | |
| 228 { | |
| 229 // We really should stash the whole path to the file we found, | |
| 230 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 231 // FIXME |
| 2974 | 232 // |
| 233 // We probably also don't need to get the library directory | |
| 234 // every time, but since this function is only called when the | |
| 235 // function file is parsed, it probably doesn't matter that | |
| 236 // much. | |
| 237 | |
| 3523 | 238 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 239 |
| 3565 | 240 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
| 2974 | 241 system_fcn_file = 1; |
| 242 } | |
| 243 else | |
| 244 system_fcn_file = 0; | |
| 245 } | |
| 246 | |
| 247 bool | |
| 248 octave_user_function::takes_varargs (void) const | |
| 249 { | |
| 250 return (param_list && param_list->takes_varargs ()); | |
| 251 } | |
| 252 | |
| 5848 | 253 bool |
| 254 octave_user_function::takes_var_return (void) const | |
| 2974 | 255 { |
| 5848 | 256 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 257 } |
| 258 | |
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259 void |
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260 octave_user_function::lock_subfunctions (void) |
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261 { |
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262 symbol_table::lock_subfunctions (local_scope); |
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263 } |
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264 |
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265 void |
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266 octave_user_function::unlock_subfunctions (void) |
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267 { |
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268 symbol_table::unlock_subfunctions (local_scope); |
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269 } |
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270 |
| 2974 | 271 octave_value_list |
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272 octave_user_function::all_va_args (const octave_value_list& args) |
| 2974 | 273 { |
| 274 octave_value_list retval; | |
| 275 | |
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276 octave_idx_type n = args.length () - num_named_args; |
| 2974 | 277 |
| 3178 | 278 if (n > 0) |
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279 retval = args.slice (num_named_args, n); |
| 2974 | 280 |
| 281 return retval; | |
| 282 } | |
| 283 | |
| 284 octave_value_list | |
| 4247 | 285 octave_user_function::subsref (const std::string& type, |
| 4219 | 286 const std::list<octave_value_list>& idx, |
| 3933 | 287 int nargout) |
| 288 { | |
| 289 octave_value_list retval; | |
| 290 | |
| 291 switch (type[0]) | |
| 292 { | |
| 293 case '(': | |
| 5154 | 294 { |
| 5155 | 295 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 296 |
| 297 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 298 } | |
| 3933 | 299 break; |
| 300 | |
| 301 case '{': | |
| 302 case '.': | |
| 303 { | |
| 304 std::string nm = type_name (); | |
| 305 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 306 } | |
| 307 break; | |
| 308 | |
| 309 default: | |
| 310 panic_impossible (); | |
| 311 } | |
| 312 | |
| 5775 | 313 // FIXME -- perhaps there should be an |
| 4059 | 314 // octave_value_list::next_subsref member function? See also |
| 315 // octave_builtin::subsref. | |
| 3933 | 316 |
| 4219 | 317 if (idx.size () > 1) |
| 4994 | 318 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 319 |
| 320 return retval; | |
| 3933 | 321 } |
| 322 | |
| 323 octave_value_list | |
| 3544 | 324 octave_user_function::do_multi_index_op (int nargout, |
| 325 const octave_value_list& args) | |
| 2974 | 326 { |
| 327 octave_value_list retval; | |
| 328 | |
| 329 if (error_state) | |
| 330 return retval; | |
| 331 | |
| 332 if (! cmd_list) | |
| 333 return retval; | |
| 334 | |
| 335 int nargin = args.length (); | |
| 336 | |
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337 unwind_protect::frame_id_t uwp_frame = unwind_protect::begin_frame (); |
| 2974 | 338 |
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339 unwind_protect::protect_var (call_depth); |
| 2974 | 340 call_depth++; |
| 341 | |
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342 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 343 { |
| 344 ::error ("max_recursion_limit exceeded"); | |
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345 unwind_protect::run_frame (uwp_frame); |
| 3131 | 346 return retval; |
| 347 } | |
| 348 | |
| 7336 | 349 // Save old and set current symbol table context, for |
| 350 // eval_undefined_error(). | |
| 351 | |
| 7901 | 352 octave_call_stack::push (this, local_scope, call_depth); |
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353 unwind_protect::add_fcn (octave_call_stack::pop); |
| 7901 | 354 |
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355 if (call_depth > 0) |
| 2974 | 356 { |
| 7336 | 357 symbol_table::push_context (); |
| 2974 | 358 |
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359 unwind_protect::add_fcn (symbol_table::pop_context); |
| 7336 | 360 } |
| 2974 | 361 |
| 362 string_vector arg_names = args.name_tags (); | |
| 363 | |
| 364 if (param_list && ! param_list->varargs_only ()) | |
| 365 { | |
| 366 param_list->define_from_arg_vector (args); | |
| 367 if (error_state) | |
| 368 goto abort; | |
| 369 } | |
| 370 | |
| 3239 | 371 // Force parameter list to be undefined when this function exits. |
| 372 // Doing so decrements the reference counts on the values of local | |
| 373 // variables that are also named function parameters. | |
| 374 | |
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375 if (param_list) |
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376 unwind_protect::add_method (param_list, |
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377 &tree_parameter_list::undefine); |
| 3239 | 378 |
| 379 // Force return list to be undefined when this function exits. | |
| 380 // Doing so decrements the reference counts on the values of local | |
| 381 // variables that are also named values returned by this function. | |
| 382 | |
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383 if (ret_list) |
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384 unwind_protect::add_method (ret_list, |
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385 &tree_parameter_list::undefine); |
| 3239 | 386 |
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387 if (call_depth == 0) |
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388 { |
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389 // Force symbols to be undefined again when this function |
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390 // exits. |
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391 // |
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392 // This cleanup function is added to the unwind_protect stack |
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393 // after the calls to clear the parameter lists so that local |
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394 // variables will be cleared before the parameter lists are |
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395 // cleared. That way, any function parameters that have been |
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396 // declared global will be unmarked as global before they are |
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397 // undefined by the clear_param_list cleanup function. |
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398 |
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399 unwind_protect::add_fcn (symbol_table::clear_variables); |
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400 } |
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401 |
| 2974 | 402 // The following code is in a separate scope to avoid warnings from |
| 403 // G++ about `goto abort' crossing the initialization of some | |
| 404 // variables. | |
| 405 | |
| 406 { | |
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407 bind_automatic_vars (arg_names, nargin, nargout, all_va_args (args)); |
| 2974 | 408 |
| 409 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 410 | |
| 411 if (echo_commands) | |
| 412 print_code_function_header (); | |
| 413 | |
| 414 // Evaluate the commands that make up the function. | |
| 415 | |
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416 unwind_protect::protect_var (tree_evaluator::in_fcn_or_script_body); |
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417 tree_evaluator::in_fcn_or_script_body = true; |
| 3489 | 418 |
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419 bool special_expr = (is_inline_function () |
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420 || cmd_list->is_anon_function_body ()); |
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421 |
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422 if (special_expr) |
| 6657 | 423 { |
| 424 assert (cmd_list->length () == 1); | |
| 425 | |
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426 tree_statement *stmt = 0; |
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427 |
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428 if ((stmt = cmd_list->front ()) |
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429 && stmt->is_expression ()) |
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430 { |
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431 tree_expression *expr = stmt->expression (); |
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432 |
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433 retval = expr->rvalue (nargout); |
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434 } |
| 6657 | 435 } |
| 436 else | |
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437 cmd_list->accept (*current_evaluator); |
| 2974 | 438 |
| 439 if (echo_commands) | |
| 440 print_code_function_trailer (); | |
| 441 | |
| 4207 | 442 if (tree_return_command::returning) |
| 443 tree_return_command::returning = 0; | |
| 2974 | 444 |
| 4207 | 445 if (tree_break_command::breaking) |
| 446 tree_break_command::breaking--; | |
| 2974 | 447 |
| 448 if (error_state) | |
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449 { |
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450 octave_call_stack::backtrace_error_message (); |
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451 goto abort; |
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452 } |
| 2974 | 453 |
| 454 // Copy return values out. | |
| 455 | |
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456 if (ret_list && ! special_expr) |
| 3871 | 457 { |
| 4748 | 458 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 459 |
| 5848 | 460 Cell varargout; |
| 461 | |
| 6591 | 462 if (ret_list->takes_varargs ()) |
| 5848 | 463 { |
| 7336 | 464 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 465 |
| 7336 | 466 if (varargout_varval.is_defined ()) |
| 6591 | 467 { |
| 7336 | 468 varargout = varargout_varval.cell_value (); |
| 5848 | 469 |
| 6591 | 470 if (error_state) |
| 471 error ("expecting varargout to be a cell array object"); | |
| 472 } | |
| 5848 | 473 } |
| 474 | |
| 475 if (! error_state) | |
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476 retval = ret_list->convert_to_const_vector (nargout, varargout); |
| 3871 | 477 } |
| 2974 | 478 } |
| 479 | |
| 480 abort: | |
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481 unwind_protect::run_frame (uwp_frame); |
| 2974 | 482 |
| 483 return retval; | |
| 484 } | |
| 485 | |
| 486 void | |
| 487 octave_user_function::accept (tree_walker& tw) | |
| 488 { | |
| 489 tw.visit_octave_user_function (*this); | |
| 490 } | |
| 491 | |
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492 bool |
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493 octave_user_function::subsasgn_optimization_ok (void) |
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494 { |
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495 bool retval = false; |
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496 if (Voptimize_subsasgn_calls |
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497 && param_list->length () > 0 && ! param_list->varargs_only () |
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498 && ret_list->length () == 1 && ! ret_list->takes_varargs ()) |
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499 { |
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500 tree_identifier *par1 = param_list->front ()->ident (); |
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501 tree_identifier *ret1 = ret_list->front ()->ident (); |
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502 retval = par1->name () == ret1->name (); |
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503 } |
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504 |
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505 return retval; |
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506 } |
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507 |
| 7336 | 508 #if 0 |
| 2974 | 509 void |
| 3933 | 510 octave_user_function::print_symtab_info (std::ostream& os) const |
| 511 { | |
| 7336 | 512 symbol_table::print_info (os, local_scope); |
| 3933 | 513 } |
| 7336 | 514 #endif |
| 3933 | 515 |
| 516 void | |
| 2974 | 517 octave_user_function::print_code_function_header (void) |
| 518 { | |
| 5794 | 519 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 520 |
| 521 tpc.visit_octave_user_function_header (*this); | |
| 522 } | |
| 523 | |
| 524 void | |
| 525 octave_user_function::print_code_function_trailer (void) | |
| 526 { | |
| 5794 | 527 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 528 |
| 529 tpc.visit_octave_user_function_trailer (*this); | |
| 530 } | |
| 531 | |
| 532 void | |
| 533 octave_user_function::bind_automatic_vars | |
| 3974 | 534 (const string_vector& arg_names, int nargin, int nargout, |
| 535 const octave_value_list& va_args) | |
| 2974 | 536 { |
| 537 if (! arg_names.empty ()) | |
| 7336 | 538 symbol_table::varref ("argn") = arg_names; |
| 2974 | 539 |
| 7336 | 540 symbol_table::varref (".nargin.") = nargin; |
| 541 symbol_table::varref (".nargout.") = nargout; | |
| 542 | |
| 543 symbol_table::mark_hidden (".nargin."); | |
| 544 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 545 |
| 546 if (takes_varargs ()) | |
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547 symbol_table::varref ("varargin") = va_args.cell_value (); |
| 2974 | 548 } |
| 549 | |
| 4700 | 550 DEFUN (nargin, args, , |
| 551 "-*- texinfo -*-\n\ | |
| 552 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 553 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 554 Within a function, return the number of arguments passed to the function.\n\ | |
| 555 At the top level, return the number of command line arguments passed to\n\ | |
| 556 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 557 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 558 function accepts a variable number of arguments.\n\ | |
| 5642 | 559 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 560 @end deftypefn") |
| 561 { | |
| 562 octave_value retval; | |
| 563 | |
| 564 int nargin = args.length (); | |
| 565 | |
| 566 if (nargin == 1) | |
| 567 { | |
| 568 std::string fname = args(0).string_value (); | |
| 569 | |
| 570 if (! error_state) | |
| 571 { | |
| 7336 | 572 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 573 |
| 574 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 575 |
| 576 if (fcn) | |
| 577 { | |
| 578 if (fcn->takes_varargs ()) | |
| 579 retval = -1; | |
| 580 else | |
| 581 { | |
| 582 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 583 | |
| 584 retval = param_list ? param_list->length () : 0; | |
| 585 } | |
| 586 } | |
| 587 else | |
| 588 error ("nargin: invalid function"); | |
| 589 } | |
| 590 else | |
| 591 error ("nargin: expecting string as first argument"); | |
| 592 } | |
| 593 else if (nargin == 0) | |
| 594 { | |
| 7336 | 595 retval = symbol_table::varval (".nargin."); |
| 4700 | 596 |
| 7336 | 597 if (retval.is_undefined ()) |
| 598 retval = 0; | |
| 4700 | 599 } |
| 600 else | |
| 5823 | 601 print_usage (); |
| 4700 | 602 |
| 603 return retval; | |
| 604 } | |
| 605 | |
| 606 DEFUN (nargout, args, , | |
| 607 "-*- texinfo -*-\n\ | |
| 608 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 609 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 610 Within a function, return the number of values the caller expects to\n\ | |
| 611 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 612 maximum number of values the named function can produce, or -1 if the\n\ | |
| 613 function can produce a variable number of values.\n\ | |
| 614 \n\ | |
| 615 For example,\n\ | |
| 616 \n\ | |
| 617 @example\n\ | |
| 618 f ()\n\ | |
| 619 @end example\n\ | |
| 620 \n\ | |
| 621 @noindent\n\ | |
| 4704 | 622 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 623 \n\ |
| 624 @example\n\ | |
| 625 [s, t] = f ()\n\ | |
| 626 @end example\n\ | |
| 627 \n\ | |
| 628 @noindent\n\ | |
| 629 will cause @code{nargout} to return 2 inside the function\n\ | |
| 630 @code{f}.\n\ | |
| 631 \n\ | |
| 632 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 633 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 634 @end deftypefn") |
| 635 { | |
| 636 octave_value retval; | |
| 637 | |
| 638 int nargin = args.length (); | |
| 639 | |
| 640 if (nargin == 1) | |
| 641 { | |
| 642 std::string fname = args(0).string_value (); | |
| 643 | |
| 644 if (! error_state) | |
| 645 { | |
| 7336 | 646 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 647 |
| 648 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 649 |
| 650 if (fcn) | |
| 651 { | |
| 652 if (fcn->takes_var_return ()) | |
| 653 retval = -1; | |
| 654 else | |
| 655 { | |
| 656 tree_parameter_list *ret_list = fcn->return_list (); | |
| 657 | |
| 658 retval = ret_list ? ret_list->length () : 0; | |
| 659 } | |
| 660 } | |
| 661 else | |
| 662 error ("nargout: invalid function"); | |
| 663 } | |
| 664 else | |
| 665 error ("nargout: expecting string as first argument"); | |
| 666 } | |
| 667 else if (nargin == 0) | |
| 668 { | |
| 7336 | 669 if (! symbol_table::at_top_level ()) |
| 4700 | 670 { |
| 7336 | 671 retval = symbol_table::varval (".nargout."); |
| 4700 | 672 |
| 7336 | 673 if (retval.is_undefined ()) |
| 674 retval = 0; | |
| 4700 | 675 } |
| 676 else | |
| 677 error ("nargout: invalid call at top level"); | |
| 678 } | |
| 679 else | |
| 5823 | 680 print_usage (); |
| 4700 | 681 |
| 682 return retval; | |
| 683 } | |
| 684 | |
| 5794 | 685 DEFUN (max_recursion_depth, args, nargout, |
| 686 "-*- texinfo -*-\n\ | |
| 687 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 688 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 689 Query or set the internal limit on the number of times a function may\n\ | |
| 690 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 691 printed and control returns to the top level.\n\ | |
| 692 @end deftypefn") | |
| 3131 | 693 { |
| 5794 | 694 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 695 } |
| 696 | |
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697 DEFUN (optimize_subsasgn_calls, args, nargout, |
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698 "-*- texinfo -*-\n\ |
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699 @deftypefn {Built-in Function} {@var{val} =} optimize_subsasgn_calls ()\n\ |
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700 @deftypefnx {Built-in Function} {@var{old_val} =} optimize_subsasgn_calls (@var{new_val})\n\ |
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701 Query or set the internal flag for subsasgn method call optimizations.\n\ |
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702 If true, Octave will attempt to eliminate the redundant copying when calling\n\ |
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703 subsasgn method of a user-defined class.\n\ |
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704 @end deftypefn") |
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705 { |
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706 return SET_INTERNAL_VARIABLE (optimize_subsasgn_calls); |
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707 } |
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708 |
| 2974 | 709 /* |
| 710 ;;; Local Variables: *** | |
| 711 ;;; mode: C++ *** | |
| 712 ;;; End: *** | |
| 713 */ |