Mercurial > octave-dspies
annotate src/ov-usr-fcn.cc @ 10578:cb0883127251
limit on recursion via calls to source function
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Tue, 27 Apr 2010 12:07:04 -0400 |
| parents | 57a59eae83cc |
| children | 9cd5aa83fa62 |
| 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) |
| 7736 | 186 { |
| 187 if (cmd_list) | |
| 188 cmd_list->mark_as_function_body (); | |
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189 |
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190 if (local_scope >= 0) |
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191 symbol_table::set_curr_fcn (this, local_scope); |
| 7736 | 192 } |
| 2974 | 193 |
| 194 octave_user_function::~octave_user_function (void) | |
| 195 { | |
| 196 delete param_list; | |
| 197 delete ret_list; | |
| 198 delete cmd_list; | |
| 3665 | 199 delete lead_comm; |
| 200 delete trail_comm; | |
| 7336 | 201 |
| 202 symbol_table::erase_scope (local_scope); | |
| 2974 | 203 } |
| 204 | |
| 205 octave_user_function * | |
| 206 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 207 { | |
| 208 ret_list = t; | |
| 209 | |
| 210 return this; | |
| 211 } | |
| 212 | |
| 213 void | |
| 4343 | 214 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 215 { |
| 4343 | 216 file_name = nm; |
| 2974 | 217 } |
| 218 | |
| 219 void | |
| 220 octave_user_function::mark_as_system_fcn_file (void) | |
| 221 { | |
| 222 if (! file_name.empty ()) | |
| 223 { | |
| 224 // We really should stash the whole path to the file we found, | |
| 225 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 226 // FIXME |
| 2974 | 227 // |
| 228 // We probably also don't need to get the library directory | |
| 229 // every time, but since this function is only called when the | |
| 230 // function file is parsed, it probably doesn't matter that | |
| 231 // much. | |
| 232 | |
| 3523 | 233 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 234 |
| 3565 | 235 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
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236 system_fcn_file = 1; |
| 2974 | 237 } |
| 238 else | |
| 239 system_fcn_file = 0; | |
| 240 } | |
| 241 | |
| 242 bool | |
| 243 octave_user_function::takes_varargs (void) const | |
| 244 { | |
| 245 return (param_list && param_list->takes_varargs ()); | |
| 246 } | |
| 247 | |
| 5848 | 248 bool |
| 249 octave_user_function::takes_var_return (void) const | |
| 2974 | 250 { |
| 5848 | 251 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 252 } |
| 253 | |
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254 void |
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255 octave_user_function::lock_subfunctions (void) |
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256 { |
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257 symbol_table::lock_subfunctions (local_scope); |
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258 } |
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259 |
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260 void |
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261 octave_user_function::unlock_subfunctions (void) |
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262 { |
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263 symbol_table::unlock_subfunctions (local_scope); |
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264 } |
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265 |
| 2974 | 266 octave_value_list |
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267 octave_user_function::all_va_args (const octave_value_list& args) |
| 2974 | 268 { |
| 269 octave_value_list retval; | |
| 270 | |
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271 octave_idx_type n = args.length () - num_named_args; |
| 2974 | 272 |
| 3178 | 273 if (n > 0) |
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274 retval = args.slice (num_named_args, n); |
| 2974 | 275 |
| 276 return retval; | |
| 277 } | |
| 278 | |
| 279 octave_value_list | |
| 4247 | 280 octave_user_function::subsref (const std::string& type, |
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281 const std::list<octave_value_list>& idx, |
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282 int nargout) |
| 3933 | 283 { |
| 284 octave_value_list retval; | |
| 285 | |
| 286 switch (type[0]) | |
| 287 { | |
| 288 case '(': | |
| 5154 | 289 { |
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290 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 291 |
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292 retval = do_multi_index_op (tmp_nargout, idx.front ()); |
| 5154 | 293 } |
| 3933 | 294 break; |
| 295 | |
| 296 case '{': | |
| 297 case '.': | |
| 298 { | |
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299 std::string nm = type_name (); |
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300 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); |
| 3933 | 301 } |
| 302 break; | |
| 303 | |
| 304 default: | |
| 305 panic_impossible (); | |
| 306 } | |
| 307 | |
| 5775 | 308 // FIXME -- perhaps there should be an |
| 4059 | 309 // octave_value_list::next_subsref member function? See also |
| 310 // octave_builtin::subsref. | |
| 3933 | 311 |
| 4219 | 312 if (idx.size () > 1) |
| 4994 | 313 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 314 |
| 315 return retval; | |
| 3933 | 316 } |
| 317 | |
| 318 octave_value_list | |
| 3544 | 319 octave_user_function::do_multi_index_op (int nargout, |
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320 const octave_value_list& args) |
| 2974 | 321 { |
| 322 octave_value_list retval; | |
| 323 | |
| 324 if (error_state) | |
| 325 return retval; | |
| 326 | |
| 327 if (! cmd_list) | |
| 328 return retval; | |
| 329 | |
| 330 int nargin = args.length (); | |
| 331 | |
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332 unwind_protect frame; |
| 2974 | 333 |
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334 frame.protect_var (call_depth); |
| 2974 | 335 call_depth++; |
| 336 | |
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337 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 338 { |
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339 ::error ("max_recursion_depth exceeded"); |
| 3131 | 340 return retval; |
| 341 } | |
| 342 | |
| 7336 | 343 // Save old and set current symbol table context, for |
| 344 // eval_undefined_error(). | |
| 345 | |
| 7901 | 346 octave_call_stack::push (this, local_scope, call_depth); |
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347 frame.add_fcn (octave_call_stack::pop); |
| 7901 | 348 |
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349 if (call_depth > 0) |
| 2974 | 350 { |
| 7336 | 351 symbol_table::push_context (); |
| 2974 | 352 |
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353 frame.add_fcn (symbol_table::pop_context); |
| 7336 | 354 } |
| 2974 | 355 |
| 356 string_vector arg_names = args.name_tags (); | |
| 357 | |
| 358 if (param_list && ! param_list->varargs_only ()) | |
| 359 { | |
| 360 param_list->define_from_arg_vector (args); | |
| 361 if (error_state) | |
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362 return retval; |
| 2974 | 363 } |
| 364 | |
| 3239 | 365 // Force parameter list to be undefined when this function exits. |
| 366 // Doing so decrements the reference counts on the values of local | |
| 367 // variables that are also named function parameters. | |
| 368 | |
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369 if (param_list) |
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370 frame.add_method (param_list, &tree_parameter_list::undefine); |
| 3239 | 371 |
| 372 // Force return list to be undefined when this function exits. | |
| 373 // Doing so decrements the reference counts on the values of local | |
| 374 // variables that are also named values returned by this function. | |
| 375 | |
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376 if (ret_list) |
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377 frame.add_method (ret_list, &tree_parameter_list::undefine); |
| 3239 | 378 |
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379 if (call_depth == 0) |
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380 { |
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381 // Force symbols to be undefined again when this function |
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382 // exits. |
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383 // |
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384 // This cleanup function is added to the unwind_protect stack |
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385 // after the calls to clear the parameter lists so that local |
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386 // variables will be cleared before the parameter lists are |
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387 // cleared. That way, any function parameters that have been |
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388 // declared global will be unmarked as global before they are |
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389 // undefined by the clear_param_list cleanup function. |
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390 |
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391 frame.add_fcn (symbol_table::clear_variables); |
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392 } |
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393 |
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394 bind_automatic_vars (arg_names, nargin, nargout, all_va_args (args)); |
| 2974 | 395 |
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396 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); |
| 2974 | 397 |
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398 if (echo_commands) |
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399 print_code_function_header (); |
| 2974 | 400 |
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401 // Evaluate the commands that make up the function. |
| 2974 | 402 |
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403 frame.protect_var (tree_evaluator::in_fcn_or_script_body); |
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404 tree_evaluator::in_fcn_or_script_body = true; |
| 3489 | 405 |
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406 bool special_expr = (is_inline_function () |
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407 || cmd_list->is_anon_function_body ()); |
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408 |
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409 if (special_expr) |
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410 { |
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411 assert (cmd_list->length () == 1); |
| 6657 | 412 |
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413 tree_statement *stmt = 0; |
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414 |
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415 if ((stmt = cmd_list->front ()) |
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416 && stmt->is_expression ()) |
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417 { |
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418 tree_expression *expr = stmt->expression (); |
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419 |
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420 retval = expr->rvalue (nargout); |
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421 } |
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422 } |
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423 else |
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424 cmd_list->accept (*current_evaluator); |
| 2974 | 425 |
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426 if (echo_commands) |
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427 print_code_function_trailer (); |
| 2974 | 428 |
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429 if (tree_return_command::returning) |
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430 tree_return_command::returning = 0; |
| 2974 | 431 |
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432 if (tree_break_command::breaking) |
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433 tree_break_command::breaking--; |
| 2974 | 434 |
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435 if (error_state) |
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436 { |
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437 octave_call_stack::backtrace_error_message (); |
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438 return retval; |
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439 } |
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440 |
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441 // Copy return values out. |
| 2974 | 442 |
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443 if (ret_list && ! special_expr) |
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444 { |
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445 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 5848 | 446 |
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447 Cell varargout; |
| 6591 | 448 |
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449 if (ret_list->takes_varargs ()) |
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450 { |
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451 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 5848 | 452 |
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453 if (varargout_varval.is_defined ()) |
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454 { |
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455 varargout = varargout_varval.cell_value (); |
| 5848 | 456 |
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457 if (error_state) |
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458 error ("expecting varargout to be a cell array object"); |
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459 } |
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460 } |
| 2974 | 461 |
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462 if (! error_state) |
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463 retval = ret_list->convert_to_const_vector (nargout, varargout); |
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464 } |
| 2974 | 465 |
| 466 return retval; | |
| 467 } | |
| 468 | |
| 469 void | |
| 470 octave_user_function::accept (tree_walker& tw) | |
| 471 { | |
| 472 tw.visit_octave_user_function (*this); | |
| 473 } | |
| 474 | |
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475 bool |
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476 octave_user_function::subsasgn_optimization_ok (void) |
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477 { |
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478 bool retval = false; |
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479 if (Voptimize_subsasgn_calls |
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480 && param_list->length () > 0 && ! param_list->varargs_only () |
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481 && ret_list->length () == 1 && ! ret_list->takes_varargs ()) |
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482 { |
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483 tree_identifier *par1 = param_list->front ()->ident (); |
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484 tree_identifier *ret1 = ret_list->front ()->ident (); |
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485 retval = par1->name () == ret1->name (); |
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486 } |
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487 |
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488 return retval; |
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489 } |
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490 |
| 7336 | 491 #if 0 |
| 2974 | 492 void |
| 3933 | 493 octave_user_function::print_symtab_info (std::ostream& os) const |
| 494 { | |
| 7336 | 495 symbol_table::print_info (os, local_scope); |
| 3933 | 496 } |
| 7336 | 497 #endif |
| 3933 | 498 |
| 499 void | |
| 2974 | 500 octave_user_function::print_code_function_header (void) |
| 501 { | |
| 5794 | 502 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 503 |
| 504 tpc.visit_octave_user_function_header (*this); | |
| 505 } | |
| 506 | |
| 507 void | |
| 508 octave_user_function::print_code_function_trailer (void) | |
| 509 { | |
| 5794 | 510 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 511 |
| 512 tpc.visit_octave_user_function_trailer (*this); | |
| 513 } | |
| 514 | |
| 515 void | |
| 516 octave_user_function::bind_automatic_vars | |
| 3974 | 517 (const string_vector& arg_names, int nargin, int nargout, |
| 518 const octave_value_list& va_args) | |
| 2974 | 519 { |
| 520 if (! arg_names.empty ()) | |
| 7336 | 521 symbol_table::varref ("argn") = arg_names; |
| 2974 | 522 |
| 7336 | 523 symbol_table::varref (".nargin.") = nargin; |
| 524 symbol_table::varref (".nargout.") = nargout; | |
| 525 | |
| 526 symbol_table::mark_hidden (".nargin."); | |
| 527 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 528 |
| 529 if (takes_varargs ()) | |
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530 symbol_table::varref ("varargin") = va_args.cell_value (); |
| 2974 | 531 } |
| 532 | |
| 4700 | 533 DEFUN (nargin, args, , |
| 534 "-*- texinfo -*-\n\ | |
| 535 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 536 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 537 Within a function, return the number of arguments passed to the function.\n\ | |
| 538 At the top level, return the number of command line arguments passed to\n\ | |
| 539 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 540 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 541 function accepts a variable number of arguments.\n\ | |
| 5642 | 542 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 543 @end deftypefn") |
| 544 { | |
| 545 octave_value retval; | |
| 546 | |
| 547 int nargin = args.length (); | |
| 548 | |
| 549 if (nargin == 1) | |
| 550 { | |
| 551 std::string fname = args(0).string_value (); | |
| 552 | |
| 553 if (! error_state) | |
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554 { |
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555 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 556 |
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557 octave_user_function *fcn = fcn_val.user_function_value (true); |
| 4700 | 558 |
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559 if (fcn) |
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560 { |
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561 if (fcn->takes_varargs ()) |
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562 retval = -1; |
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563 else |
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564 { |
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565 tree_parameter_list *param_list = fcn->parameter_list (); |
| 4700 | 566 |
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567 retval = param_list ? param_list->length () : 0; |
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568 } |
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569 } |
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570 else |
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571 error ("nargin: invalid function"); |
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572 } |
| 4700 | 573 else |
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574 error ("nargin: expecting string as first argument"); |
| 4700 | 575 } |
| 576 else if (nargin == 0) | |
| 577 { | |
| 7336 | 578 retval = symbol_table::varval (".nargin."); |
| 4700 | 579 |
| 7336 | 580 if (retval.is_undefined ()) |
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581 retval = 0; |
| 4700 | 582 } |
| 583 else | |
| 5823 | 584 print_usage (); |
| 4700 | 585 |
| 586 return retval; | |
| 587 } | |
| 588 | |
| 589 DEFUN (nargout, args, , | |
| 590 "-*- texinfo -*-\n\ | |
| 591 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 592 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 593 Within a function, return the number of values the caller expects to\n\ | |
| 594 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 595 maximum number of values the named function can produce, or -1 if the\n\ | |
| 596 function can produce a variable number of values.\n\ | |
| 597 \n\ | |
| 598 For example,\n\ | |
| 599 \n\ | |
| 600 @example\n\ | |
| 601 f ()\n\ | |
| 602 @end example\n\ | |
| 603 \n\ | |
| 604 @noindent\n\ | |
| 4704 | 605 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 606 \n\ |
| 607 @example\n\ | |
| 608 [s, t] = f ()\n\ | |
| 609 @end example\n\ | |
| 610 \n\ | |
| 611 @noindent\n\ | |
| 612 will cause @code{nargout} to return 2 inside the function\n\ | |
| 613 @code{f}.\n\ | |
| 614 \n\ | |
| 615 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 616 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 617 @end deftypefn") |
| 618 { | |
| 619 octave_value retval; | |
| 620 | |
| 621 int nargin = args.length (); | |
| 622 | |
| 623 if (nargin == 1) | |
| 624 { | |
| 625 std::string fname = args(0).string_value (); | |
| 626 | |
| 627 if (! error_state) | |
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628 { |
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629 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 630 |
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631 octave_user_function *fcn = fcn_val.user_function_value (true); |
| 4700 | 632 |
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633 if (fcn) |
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634 { |
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635 if (fcn->takes_var_return ()) |
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636 retval = -1; |
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637 else |
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638 { |
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639 tree_parameter_list *ret_list = fcn->return_list (); |
| 4700 | 640 |
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641 retval = ret_list ? ret_list->length () : 0; |
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642 } |
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643 } |
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644 else |
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645 error ("nargout: invalid function"); |
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646 } |
| 4700 | 647 else |
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648 error ("nargout: expecting string as first argument"); |
| 4700 | 649 } |
| 650 else if (nargin == 0) | |
| 651 { | |
| 7336 | 652 if (! symbol_table::at_top_level ()) |
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653 { |
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654 retval = symbol_table::varval (".nargout."); |
| 4700 | 655 |
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656 if (retval.is_undefined ()) |
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657 retval = 0; |
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658 } |
| 4700 | 659 else |
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660 error ("nargout: invalid call at top level"); |
| 4700 | 661 } |
| 662 else | |
| 5823 | 663 print_usage (); |
| 4700 | 664 |
| 665 return retval; | |
| 666 } | |
| 667 | |
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668 DEFUN (optimize_subsasgn_calls, args, nargout, |
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Jaroslav Hajek <highegg@gmail.com>
parents:
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669 "-*- texinfo -*-\n\ |
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670 @deftypefn {Built-in Function} {@var{val} =} optimize_subsasgn_calls ()\n\ |
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parents:
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671 @deftypefnx {Built-in Function} {@var{old_val} =} optimize_subsasgn_calls (@var{new_val})\n\ |
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parents:
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672 Query or set the internal flag for subsasgn method call optimizations.\n\ |
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Jaroslav Hajek <highegg@gmail.com>
parents:
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673 If true, Octave will attempt to eliminate the redundant copying when calling\n\ |
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e79470be3ecb
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Jaroslav Hajek <highegg@gmail.com>
parents:
9396
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674 subsasgn method of a user-defined class.\n\ |
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e79470be3ecb
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Jaroslav Hajek <highegg@gmail.com>
parents:
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675 @end deftypefn") |
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e79470be3ecb
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Jaroslav Hajek <highegg@gmail.com>
parents:
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676 { |
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Jaroslav Hajek <highegg@gmail.com>
parents:
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677 return SET_INTERNAL_VARIABLE (optimize_subsasgn_calls); |
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Jaroslav Hajek <highegg@gmail.com>
parents:
9396
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678 } |