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annotate src/ov-usr-fcn.cc @ 10796:eaf7c8ab3b0c
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| author | Rik <octave@nomad.inbox5.com> |
|---|---|
| date | Sun, 18 Jul 2010 22:22:45 -0700 |
| parents | 9cd5aa83fa62 |
| children | 1b2fcd122c6a |
| 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 | |
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52 // Whether to optimize subsasgn method calls. |
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53 static bool Voptimize_subsasgn_calls = true; |
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54 |
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55 // User defined scripts. |
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56 |
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57 DEFINE_OCTAVE_ALLOCATOR (octave_user_script); |
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58 |
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59 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_script, |
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60 "user-defined script", |
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61 "user-defined script"); |
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62 |
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63 octave_user_script::octave_user_script (void) |
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64 : octave_user_code (), cmd_list (0), file_name (), |
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65 t_parsed (static_cast<time_t> (0)), |
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66 t_checked (static_cast<time_t> (0)), |
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67 call_depth (-1) |
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68 { } |
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69 |
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70 octave_user_script::octave_user_script (const std::string& fnm, |
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71 const std::string& nm, |
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72 tree_statement_list *cmds, |
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73 const std::string& ds) |
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74 : octave_user_code (nm, ds), cmd_list (cmds), file_name (fnm), |
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75 t_parsed (static_cast<time_t> (0)), |
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76 t_checked (static_cast<time_t> (0)), |
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77 call_depth (-1) |
| 7736 | 78 { |
| 79 if (cmd_list) | |
| 80 cmd_list->mark_as_script_body (); | |
| 81 } | |
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82 |
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83 octave_user_script::octave_user_script (const std::string& fnm, |
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84 const std::string& nm, |
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85 const std::string& ds) |
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86 : octave_user_code (nm, ds), cmd_list (0), file_name (fnm), |
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87 t_parsed (static_cast<time_t> (0)), |
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88 t_checked (static_cast<time_t> (0)), |
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89 call_depth (-1) |
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90 { } |
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91 |
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92 octave_user_script::~octave_user_script (void) |
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93 { |
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94 delete cmd_list; |
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95 } |
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96 |
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97 octave_value_list |
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98 octave_user_script::subsref (const std::string&, |
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99 const std::list<octave_value_list>&, int) |
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100 { |
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101 octave_value_list retval; |
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102 |
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103 ::error ("invalid use of script %s in index expression", file_name.c_str ()); |
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104 |
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105 return retval; |
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106 } |
| 7336 | 107 |
| 108 octave_value_list | |
| 109 octave_user_script::do_multi_index_op (int nargout, | |
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110 const octave_value_list& args) |
| 7336 | 111 { |
| 112 octave_value_list retval; | |
| 113 | |
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114 unwind_protect frame; |
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115 |
| 7336 | 116 if (! error_state) |
| 117 { | |
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118 if (args.length () == 0 && nargout == 0) |
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119 { |
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120 if (cmd_list) |
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121 { |
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122 frame.protect_var (call_depth); |
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123 call_depth++; |
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124 |
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125 if (call_depth < Vmax_recursion_depth) |
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126 { |
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127 octave_call_stack::push (this); |
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128 |
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129 frame.add_fcn (octave_call_stack::pop); |
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130 |
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131 frame.protect_var (tree_evaluator::in_fcn_or_script_body); |
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132 tree_evaluator::in_fcn_or_script_body = true; |
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133 |
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134 cmd_list->accept (*current_evaluator); |
| 7336 | 135 |
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136 if (tree_return_command::returning) |
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137 tree_return_command::returning = 0; |
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138 |
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139 if (tree_break_command::breaking) |
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140 tree_break_command::breaking--; |
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141 |
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142 if (error_state) |
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143 octave_call_stack::backtrace_error_message (); |
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144 } |
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145 else |
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146 ::error ("max_recursion_depth exceeded"); |
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147 } |
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148 } |
| 7336 | 149 else |
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150 error ("invalid call to script %s", file_name.c_str ()); |
| 7336 | 151 } |
| 152 | |
| 153 return retval; | |
| 154 } | |
| 155 | |
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156 void |
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157 octave_user_script::accept (tree_walker& tw) |
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158 { |
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159 tw.visit_octave_user_script (*this); |
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160 } |
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161 |
| 2974 | 162 // User defined functions. |
| 163 | |
| 3219 | 164 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
| 2974 | 165 |
| 3219 | 166 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
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167 "user-defined function", |
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168 "user-defined function"); |
| 2974 | 169 |
| 170 // Ugh. This really needs to be simplified (code/data? | |
| 171 // extrinsic/intrinsic state?). | |
| 172 | |
| 173 octave_user_function::octave_user_function | |
| 7336 | 174 (symbol_table::scope_id sid, tree_parameter_list *pl, |
| 175 tree_parameter_list *rl, tree_statement_list *cl) | |
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176 : octave_user_code (std::string (), std::string ()), |
| 2974 | 177 param_list (pl), ret_list (rl), cmd_list (cl), |
| 7336 | 178 lead_comm (), trail_comm (), file_name (), |
| 6323 | 179 parent_name (), t_parsed (static_cast<time_t> (0)), |
| 3255 | 180 t_checked (static_cast<time_t> (0)), |
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181 system_fcn_file (false), call_depth (-1), |
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182 num_named_args (param_list ? param_list->length () : 0), |
| 7336 | 183 nested_function (false), inline_function (false), |
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184 class_constructor (false), class_method (false), |
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185 parent_scope (-1), local_scope (sid), |
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186 curr_unwind_protect_frame (0) |
| 7736 | 187 { |
| 188 if (cmd_list) | |
| 189 cmd_list->mark_as_function_body (); | |
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190 |
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191 if (local_scope >= 0) |
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192 symbol_table::set_curr_fcn (this, local_scope); |
| 7736 | 193 } |
| 2974 | 194 |
| 195 octave_user_function::~octave_user_function (void) | |
| 196 { | |
| 197 delete param_list; | |
| 198 delete ret_list; | |
| 199 delete cmd_list; | |
| 3665 | 200 delete lead_comm; |
| 201 delete trail_comm; | |
| 7336 | 202 |
| 203 symbol_table::erase_scope (local_scope); | |
| 2974 | 204 } |
| 205 | |
| 206 octave_user_function * | |
| 207 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 208 { | |
| 209 ret_list = t; | |
| 210 | |
| 211 return this; | |
| 212 } | |
| 213 | |
| 214 void | |
| 4343 | 215 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 216 { |
| 4343 | 217 file_name = nm; |
| 2974 | 218 } |
| 219 | |
| 220 void | |
| 221 octave_user_function::mark_as_system_fcn_file (void) | |
| 222 { | |
| 223 if (! file_name.empty ()) | |
| 224 { | |
| 225 // We really should stash the whole path to the file we found, | |
| 226 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 227 // FIXME |
| 2974 | 228 // |
| 229 // We probably also don't need to get the library directory | |
| 230 // every time, but since this function is only called when the | |
| 231 // function file is parsed, it probably doesn't matter that | |
| 232 // much. | |
| 233 | |
| 3523 | 234 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 235 |
| 3565 | 236 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
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237 system_fcn_file = 1; |
| 2974 | 238 } |
| 239 else | |
| 240 system_fcn_file = 0; | |
| 241 } | |
| 242 | |
| 243 bool | |
| 244 octave_user_function::takes_varargs (void) const | |
| 245 { | |
| 246 return (param_list && param_list->takes_varargs ()); | |
| 247 } | |
| 248 | |
| 5848 | 249 bool |
| 250 octave_user_function::takes_var_return (void) const | |
| 2974 | 251 { |
| 5848 | 252 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 253 } |
| 254 | |
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255 void |
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256 octave_user_function::lock_subfunctions (void) |
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257 { |
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258 symbol_table::lock_subfunctions (local_scope); |
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259 } |
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260 |
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261 void |
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262 octave_user_function::unlock_subfunctions (void) |
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263 { |
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264 symbol_table::unlock_subfunctions (local_scope); |
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265 } |
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266 |
| 2974 | 267 octave_value_list |
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268 octave_user_function::all_va_args (const octave_value_list& args) |
| 2974 | 269 { |
| 270 octave_value_list retval; | |
| 271 | |
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272 octave_idx_type n = args.length () - num_named_args; |
| 2974 | 273 |
| 3178 | 274 if (n > 0) |
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275 retval = args.slice (num_named_args, n); |
| 2974 | 276 |
| 277 return retval; | |
| 278 } | |
| 279 | |
| 280 octave_value_list | |
| 4247 | 281 octave_user_function::subsref (const std::string& type, |
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282 const std::list<octave_value_list>& idx, |
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283 int nargout) |
| 3933 | 284 { |
| 285 octave_value_list retval; | |
| 286 | |
| 287 switch (type[0]) | |
| 288 { | |
| 289 case '(': | |
| 5154 | 290 { |
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291 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 292 |
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293 retval = do_multi_index_op (tmp_nargout, idx.front ()); |
| 5154 | 294 } |
| 3933 | 295 break; |
| 296 | |
| 297 case '{': | |
| 298 case '.': | |
| 299 { | |
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300 std::string nm = type_name (); |
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301 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
| 3933 | 302 } |
| 303 break; | |
| 304 | |
| 305 default: | |
| 306 panic_impossible (); | |
| 307 } | |
| 308 | |
| 5775 | 309 // FIXME -- perhaps there should be an |
| 4059 | 310 // octave_value_list::next_subsref member function? See also |
| 311 // octave_builtin::subsref. | |
| 3933 | 312 |
| 4219 | 313 if (idx.size () > 1) |
| 4994 | 314 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 315 |
| 316 return retval; | |
| 3933 | 317 } |
| 318 | |
| 319 octave_value_list | |
| 3544 | 320 octave_user_function::do_multi_index_op (int nargout, |
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321 const octave_value_list& args) |
| 2974 | 322 { |
| 323 octave_value_list retval; | |
| 324 | |
| 325 if (error_state) | |
| 326 return retval; | |
| 327 | |
| 328 if (! cmd_list) | |
| 329 return retval; | |
| 330 | |
| 331 int nargin = args.length (); | |
| 332 | |
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333 unwind_protect frame; |
| 2974 | 334 |
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335 frame.protect_var (call_depth); |
| 2974 | 336 call_depth++; |
| 337 | |
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338 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 339 { |
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340 ::error ("max_recursion_depth exceeded"); |
| 3131 | 341 return retval; |
| 342 } | |
| 343 | |
| 7336 | 344 // Save old and set current symbol table context, for |
| 345 // eval_undefined_error(). | |
| 346 | |
| 7901 | 347 octave_call_stack::push (this, local_scope, call_depth); |
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348 frame.add_fcn (octave_call_stack::pop); |
| 7901 | 349 |
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350 if (call_depth > 0) |
| 2974 | 351 { |
| 7336 | 352 symbol_table::push_context (); |
| 2974 | 353 |
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354 frame.add_fcn (symbol_table::pop_context); |
| 7336 | 355 } |
| 2974 | 356 |
| 357 string_vector arg_names = args.name_tags (); | |
| 358 | |
| 359 if (param_list && ! param_list->varargs_only ()) | |
| 360 { | |
| 361 param_list->define_from_arg_vector (args); | |
| 362 if (error_state) | |
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363 return retval; |
| 2974 | 364 } |
| 365 | |
| 3239 | 366 // Force parameter list to be undefined when this function exits. |
| 367 // Doing so decrements the reference counts on the values of local | |
| 368 // variables that are also named function parameters. | |
| 369 | |
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370 if (param_list) |
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371 frame.add_method (param_list, &tree_parameter_list::undefine); |
| 3239 | 372 |
| 373 // Force return list to be undefined when this function exits. | |
| 374 // Doing so decrements the reference counts on the values of local | |
| 375 // variables that are also named values returned by this function. | |
| 376 | |
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377 if (ret_list) |
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378 frame.add_method (ret_list, &tree_parameter_list::undefine); |
| 3239 | 379 |
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380 if (call_depth == 0) |
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381 { |
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382 // Force symbols to be undefined again when this function |
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383 // exits. |
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384 // |
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385 // This cleanup function is added to the unwind_protect stack |
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386 // after the calls to clear the parameter lists so that local |
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387 // variables will be cleared before the parameter lists are |
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388 // cleared. That way, any function parameters that have been |
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389 // declared global will be unmarked as global before they are |
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390 // undefined by the clear_param_list cleanup function. |
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391 |
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392 frame.add_fcn (symbol_table::clear_variables); |
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393 } |
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394 |
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395 bind_automatic_vars (arg_names, nargin, nargout, all_va_args (args)); |
| 2974 | 396 |
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397 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); |
| 2974 | 398 |
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399 if (echo_commands) |
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400 print_code_function_header (); |
| 2974 | 401 |
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402 // Set pointer to the current unwind_protect frame to allow |
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403 // certain builtins register simple cleanup in a very optimized manner. |
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404 // This is *not* intended as a general-purpose on-cleanup mechanism, |
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405 frame.protect_var (curr_unwind_protect_frame); |
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406 curr_unwind_protect_frame = &frame; |
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407 |
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408 // Evaluate the commands that make up the function. |
| 2974 | 409 |
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410 frame.protect_var (tree_evaluator::in_fcn_or_script_body); |
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411 tree_evaluator::in_fcn_or_script_body = true; |
| 3489 | 412 |
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413 bool special_expr = (is_inline_function () |
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414 || cmd_list->is_anon_function_body ()); |
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415 |
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416 if (special_expr) |
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417 { |
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418 assert (cmd_list->length () == 1); |
| 6657 | 419 |
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420 tree_statement *stmt = 0; |
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421 |
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422 if ((stmt = cmd_list->front ()) |
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423 && stmt->is_expression ()) |
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424 { |
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425 tree_expression *expr = stmt->expression (); |
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426 |
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427 retval = expr->rvalue (nargout); |
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428 } |
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429 } |
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430 else |
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431 cmd_list->accept (*current_evaluator); |
| 2974 | 432 |
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433 if (echo_commands) |
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434 print_code_function_trailer (); |
| 2974 | 435 |
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436 if (tree_return_command::returning) |
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437 tree_return_command::returning = 0; |
| 2974 | 438 |
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439 if (tree_break_command::breaking) |
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440 tree_break_command::breaking--; |
| 2974 | 441 |
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442 if (error_state) |
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443 { |
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444 octave_call_stack::backtrace_error_message (); |
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445 return retval; |
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446 } |
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447 |
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448 // Copy return values out. |
| 2974 | 449 |
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450 if (ret_list && ! special_expr) |
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451 { |
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452 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 5848 | 453 |
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454 Cell varargout; |
| 6591 | 455 |
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456 if (ret_list->takes_varargs ()) |
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457 { |
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458 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 5848 | 459 |
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460 if (varargout_varval.is_defined ()) |
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461 { |
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462 varargout = varargout_varval.cell_value (); |
| 5848 | 463 |
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464 if (error_state) |
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465 error ("expecting varargout to be a cell array object"); |
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466 } |
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467 } |
| 2974 | 468 |
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469 if (! error_state) |
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470 retval = ret_list->convert_to_const_vector (nargout, varargout); |
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471 } |
| 2974 | 472 |
| 473 return retval; | |
| 474 } | |
| 475 | |
| 476 void | |
| 477 octave_user_function::accept (tree_walker& tw) | |
| 478 { | |
| 479 tw.visit_octave_user_function (*this); | |
| 480 } | |
| 481 | |
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482 bool |
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483 octave_user_function::subsasgn_optimization_ok (void) |
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484 { |
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485 bool retval = false; |
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486 if (Voptimize_subsasgn_calls |
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487 && param_list->length () > 0 && ! param_list->varargs_only () |
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488 && ret_list->length () == 1 && ! ret_list->takes_varargs ()) |
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489 { |
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490 tree_identifier *par1 = param_list->front ()->ident (); |
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491 tree_identifier *ret1 = ret_list->front ()->ident (); |
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492 retval = par1->name () == ret1->name (); |
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493 } |
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494 |
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495 return retval; |
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496 } |
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497 |
| 7336 | 498 #if 0 |
| 2974 | 499 void |
| 3933 | 500 octave_user_function::print_symtab_info (std::ostream& os) const |
| 501 { | |
| 7336 | 502 symbol_table::print_info (os, local_scope); |
| 3933 | 503 } |
| 7336 | 504 #endif |
| 3933 | 505 |
| 506 void | |
| 2974 | 507 octave_user_function::print_code_function_header (void) |
| 508 { | |
| 5794 | 509 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 510 |
| 511 tpc.visit_octave_user_function_header (*this); | |
| 512 } | |
| 513 | |
| 514 void | |
| 515 octave_user_function::print_code_function_trailer (void) | |
| 516 { | |
| 5794 | 517 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 518 |
| 519 tpc.visit_octave_user_function_trailer (*this); | |
| 520 } | |
| 521 | |
| 522 void | |
| 523 octave_user_function::bind_automatic_vars | |
| 3974 | 524 (const string_vector& arg_names, int nargin, int nargout, |
| 525 const octave_value_list& va_args) | |
| 2974 | 526 { |
| 527 if (! arg_names.empty ()) | |
| 7336 | 528 symbol_table::varref ("argn") = arg_names; |
| 2974 | 529 |
| 7336 | 530 symbol_table::varref (".nargin.") = nargin; |
| 531 symbol_table::varref (".nargout.") = nargout; | |
| 532 | |
| 533 symbol_table::mark_hidden (".nargin."); | |
| 534 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 535 |
| 536 if (takes_varargs ()) | |
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537 symbol_table::varref ("varargin") = va_args.cell_value (); |
| 2974 | 538 } |
| 539 | |
| 4700 | 540 DEFUN (nargin, args, , |
| 541 "-*- texinfo -*-\n\ | |
| 542 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 543 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 544 Within a function, return the number of arguments passed to the function.\n\ | |
| 545 At the top level, return the number of command line arguments passed to\n\ | |
| 546 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 547 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 548 function accepts a variable number of arguments.\n\ | |
| 5642 | 549 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 550 @end deftypefn") |
| 551 { | |
| 552 octave_value retval; | |
| 553 | |
| 554 int nargin = args.length (); | |
| 555 | |
| 556 if (nargin == 1) | |
| 557 { | |
| 558 std::string fname = args(0).string_value (); | |
| 559 | |
| 560 if (! error_state) | |
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561 { |
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562 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 563 |
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564 octave_user_function *fcn = fcn_val.user_function_value (true); |
| 4700 | 565 |
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566 if (fcn) |
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567 { |
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568 if (fcn->takes_varargs ()) |
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569 retval = -1; |
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570 else |
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571 { |
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572 tree_parameter_list *param_list = fcn->parameter_list (); |
| 4700 | 573 |
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574 retval = param_list ? param_list->length () : 0; |
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575 } |
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576 } |
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577 else |
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578 error ("nargin: invalid function"); |
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579 } |
| 4700 | 580 else |
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581 error ("nargin: expecting string as first argument"); |
| 4700 | 582 } |
| 583 else if (nargin == 0) | |
| 584 { | |
| 7336 | 585 retval = symbol_table::varval (".nargin."); |
| 4700 | 586 |
| 7336 | 587 if (retval.is_undefined ()) |
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588 retval = 0; |
| 4700 | 589 } |
| 590 else | |
| 5823 | 591 print_usage (); |
| 4700 | 592 |
| 593 return retval; | |
| 594 } | |
| 595 | |
| 596 DEFUN (nargout, args, , | |
| 597 "-*- texinfo -*-\n\ | |
| 598 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 599 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 600 Within a function, return the number of values the caller expects to\n\ | |
| 601 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 602 maximum number of values the named function can produce, or -1 if the\n\ | |
| 603 function can produce a variable number of values.\n\ | |
| 604 \n\ | |
| 605 For example,\n\ | |
| 606 \n\ | |
| 607 @example\n\ | |
| 608 f ()\n\ | |
| 609 @end example\n\ | |
| 610 \n\ | |
| 611 @noindent\n\ | |
| 4704 | 612 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 613 \n\ |
| 614 @example\n\ | |
| 615 [s, t] = f ()\n\ | |
| 616 @end example\n\ | |
| 617 \n\ | |
| 618 @noindent\n\ | |
| 619 will cause @code{nargout} to return 2 inside the function\n\ | |
| 620 @code{f}.\n\ | |
| 621 \n\ | |
| 622 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 623 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 624 @end deftypefn") |
| 625 { | |
| 626 octave_value retval; | |
| 627 | |
| 628 int nargin = args.length (); | |
| 629 | |
| 630 if (nargin == 1) | |
| 631 { | |
| 632 std::string fname = args(0).string_value (); | |
| 633 | |
| 634 if (! error_state) | |
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635 { |
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636 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 637 |
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638 octave_user_function *fcn = fcn_val.user_function_value (true); |
| 4700 | 639 |
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640 if (fcn) |
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641 { |
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642 if (fcn->takes_var_return ()) |
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643 retval = -1; |
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644 else |
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645 { |
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646 tree_parameter_list *ret_list = fcn->return_list (); |
| 4700 | 647 |
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648 retval = ret_list ? ret_list->length () : 0; |
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649 } |
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650 } |
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651 else |
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652 error ("nargout: invalid function"); |
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653 } |
| 4700 | 654 else |
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655 error ("nargout: expecting string as first argument"); |
| 4700 | 656 } |
| 657 else if (nargin == 0) | |
| 658 { | |
| 7336 | 659 if (! symbol_table::at_top_level ()) |
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660 { |
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661 retval = symbol_table::varval (".nargout."); |
| 4700 | 662 |
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663 if (retval.is_undefined ()) |
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664 retval = 0; |
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665 } |
| 4700 | 666 else |
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667 error ("nargout: invalid call at top level"); |
| 4700 | 668 } |
| 669 else | |
| 5823 | 670 print_usage (); |
| 4700 | 671 |
| 672 return retval; | |
| 673 } | |
| 674 | |
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675 DEFUN (optimize_subsasgn_calls, args, nargout, |
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676 "-*- texinfo -*-\n\ |
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677 @deftypefn {Built-in Function} {@var{val} =} optimize_subsasgn_calls ()\n\ |
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678 @deftypefnx {Built-in Function} {@var{old_val} =} optimize_subsasgn_calls (@var{new_val})\n\ |
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679 Query or set the internal flag for subsasgn method call optimizations.\n\ |
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680 If true, Octave will attempt to eliminate the redundant copying when calling\n\ |
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681 subsasgn method of a user-defined class.\n\ |
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682 @end deftypefn") |
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683 { |
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684 return SET_INTERNAL_VARIABLE (optimize_subsasgn_calls); |
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685 } |