Mercurial > hg > octave-lyh
annotate src/ov-usr-fcn.cc @ 9396:17af7cce7d1b
yet more unwind_protect improvements
| author | Jaroslav Hajek <highegg@gmail.com> |
|---|---|
| date | Thu, 25 Jun 2009 13:57:38 +0200 |
| parents | 610bf90fce2a |
| children | e79470be3ecb |
| 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" | |
|
8658
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
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 |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
55 // User defined scripts. |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
56 |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
57 DEFINE_OCTAVE_ALLOCATOR (octave_user_script); |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
58 |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
59 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_script, |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
60 "user-defined script", |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
61 "user-defined script"); |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
62 |
|
7731
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
63 octave_user_script::octave_user_script (void) |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
64 : octave_user_code (), cmd_list (0), file_name (), |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
65 t_parsed (static_cast<time_t> (0)), |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
66 t_checked (static_cast<time_t> (0)), |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7736
diff
changeset
|
67 call_depth (-1) |
|
7731
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
68 { } |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
69 |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
70 octave_user_script::octave_user_script (const std::string& fnm, |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
71 const std::string& nm, |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
72 tree_statement_list *cmds, |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
73 const std::string& ds) |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
74 : octave_user_code (nm, ds), cmd_list (cmds), file_name (fnm), |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
75 t_parsed (static_cast<time_t> (0)), |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
76 t_checked (static_cast<time_t> (0)), |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7736
diff
changeset
|
77 call_depth (-1) |
| 7736 | 78 { |
| 79 if (cmd_list) | |
| 80 cmd_list->mark_as_script_body (); | |
| 81 } | |
|
7731
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
82 |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
83 octave_user_script::octave_user_script (const std::string& fnm, |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
84 const std::string& nm, |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
85 const std::string& ds) |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
86 : octave_user_code (nm, ds), cmd_list (0), file_name (fnm), |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
87 t_parsed (static_cast<time_t> (0)), |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
88 t_checked (static_cast<time_t> (0)), |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7736
diff
changeset
|
89 call_depth (-1) |
|
7731
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
90 { } |
|
2d2a969c731c
fix max_recursion_limit exceeded at startup with Intel C++
Jaroslav Hajek <highegg@gmail.com>
parents:
7719
diff
changeset
|
91 |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
92 octave_user_script::~octave_user_script (void) |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
93 { |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
94 delete cmd_list; |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
95 } |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
96 |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
97 octave_value_list |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
98 octave_user_script::subsref (const std::string&, |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
99 const std::list<octave_value_list>&, int) |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
100 { |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
101 octave_value_list retval; |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
102 |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
103 ::error ("invalid use of script in index expression"); |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
104 |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
105 return retval; |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
106 } |
| 7336 | 107 |
| 108 octave_value_list | |
| 109 octave_user_script::do_multi_index_op (int nargout, | |
| 110 const octave_value_list& args) | |
| 111 { | |
| 112 octave_value_list retval; | |
| 113 | |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
114 unwind_protect::frame_id_t uwp_frame = unwind_protect::begin_frame (); |
|
8011
3100283874d7
improve backtrace error messages
John W. Eaton <jwe@octave.org>
parents:
7968
diff
changeset
|
115 |
| 7336 | 116 if (! error_state) |
| 117 { | |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
118 if (args.length () == 0 && nargout == 0) |
| 7336 | 119 { |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
120 if (cmd_list) |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
121 { |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
122 unwind_protect::protect_var (call_depth); |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
123 call_depth++; |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
124 |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7736
diff
changeset
|
125 if (call_depth < Vmax_recursion_depth) |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
126 { |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
127 octave_call_stack::push (this); |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
128 |
|
9396
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
129 unwind_protect::add_fcn (octave_call_stack::pop); |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
130 |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
131 unwind_protect::protect_var (tree_evaluator::in_fcn_or_script_body); |
|
8669
33783e94fb16
line number fixes and other evaluator tweaks
John W. Eaton <jwe@octave.org>
parents:
8658
diff
changeset
|
132 tree_evaluator::in_fcn_or_script_body = true; |
|
33783e94fb16
line number fixes and other evaluator tweaks
John W. Eaton <jwe@octave.org>
parents:
8658
diff
changeset
|
133 |
|
8658
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
134 cmd_list->accept (*current_evaluator); |
| 7336 | 135 |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
136 if (tree_return_command::returning) |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
137 tree_return_command::returning = 0; |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
138 |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
139 if (tree_break_command::breaking) |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
140 tree_break_command::breaking--; |
|
8013
b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
John W. Eaton <jwe@octave.org>
parents:
8011
diff
changeset
|
141 |
|
b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
John W. Eaton <jwe@octave.org>
parents:
8011
diff
changeset
|
142 if (error_state) |
|
b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
John W. Eaton <jwe@octave.org>
parents:
8011
diff
changeset
|
143 octave_call_stack::backtrace_error_message (); |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
144 } |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
145 else |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
146 ::error ("max_recursion_limit exceeded"); |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
147 } |
| 7336 | 148 } |
| 149 else | |
| 150 error ("invalid call to script"); | |
| 151 } | |
| 152 | |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
153 unwind_protect::run_frame (uwp_frame); |
|
8011
3100283874d7
improve backtrace error messages
John W. Eaton <jwe@octave.org>
parents:
7968
diff
changeset
|
154 |
| 7336 | 155 return retval; |
| 156 } | |
| 157 | |
|
7715
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
158 void |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
159 octave_user_script::accept (tree_walker& tw) |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
160 { |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
161 tw.visit_octave_user_script (*this); |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
162 } |
|
5b4d278ec828
parse scripts completely before executing
John W. Eaton <jwe@octave.org>
parents:
7589
diff
changeset
|
163 |
| 2974 | 164 // User defined functions. |
| 165 | |
| 3219 | 166 DEFINE_OCTAVE_ALLOCATOR (octave_user_function); |
| 2974 | 167 |
| 3219 | 168 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_user_function, |
| 4612 | 169 "user-defined function", |
| 3219 | 170 "user-defined function"); |
| 2974 | 171 |
| 172 // Ugh. This really needs to be simplified (code/data? | |
| 173 // extrinsic/intrinsic state?). | |
| 174 | |
| 175 octave_user_function::octave_user_function | |
| 7336 | 176 (symbol_table::scope_id sid, tree_parameter_list *pl, |
| 177 tree_parameter_list *rl, tree_statement_list *cl) | |
|
7719
87eda1f8faaa
octave_user_code: new base class for octave_user_script and octave_user_function
John W. Eaton <jwe@octave.org>
parents:
7715
diff
changeset
|
178 : octave_user_code (std::string (), std::string ()), |
| 2974 | 179 param_list (pl), ret_list (rl), cmd_list (cl), |
| 7336 | 180 lead_comm (), trail_comm (), file_name (), |
| 6323 | 181 parent_name (), t_parsed (static_cast<time_t> (0)), |
| 3255 | 182 t_checked (static_cast<time_t> (0)), |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7736
diff
changeset
|
183 system_fcn_file (false), call_depth (-1), |
|
7589
90fb25a5a3fa
minor cleanup in octave_user_function constructor
John W. Eaton <jwe@octave.org>
parents:
7552
diff
changeset
|
184 num_named_args (param_list ? param_list->length () : 0), |
| 7336 | 185 nested_function (false), inline_function (false), |
|
8785
70f5a0375afd
oct-map.h: fix think-o in previous change
John W. Eaton <jwe@octave.org>
parents:
8669
diff
changeset
|
186 class_constructor (false), class_method (false), args_passed (), |
|
70f5a0375afd
oct-map.h: fix think-o in previous change
John W. Eaton <jwe@octave.org>
parents:
8669
diff
changeset
|
187 num_args_passed (0), parent_scope (-1), local_scope (sid) |
| 7736 | 188 { |
| 189 if (cmd_list) | |
| 190 cmd_list->mark_as_function_body (); | |
| 191 } | |
| 2974 | 192 |
| 193 octave_user_function::~octave_user_function (void) | |
| 194 { | |
| 195 delete param_list; | |
| 196 delete ret_list; | |
| 197 delete cmd_list; | |
| 3665 | 198 delete lead_comm; |
| 199 delete trail_comm; | |
| 7336 | 200 |
| 201 symbol_table::erase_scope (local_scope); | |
| 2974 | 202 } |
| 203 | |
| 204 octave_user_function * | |
| 205 octave_user_function::define_ret_list (tree_parameter_list *t) | |
| 206 { | |
| 207 ret_list = t; | |
| 208 | |
| 209 return this; | |
| 210 } | |
| 211 | |
| 212 void | |
| 4343 | 213 octave_user_function::stash_fcn_file_name (const std::string& nm) |
| 2974 | 214 { |
| 4343 | 215 file_name = nm; |
| 2974 | 216 } |
| 217 | |
| 218 void | |
| 219 octave_user_function::mark_as_system_fcn_file (void) | |
| 220 { | |
| 221 if (! file_name.empty ()) | |
| 222 { | |
| 223 // We really should stash the whole path to the file we found, | |
| 224 // when we looked it up, to avoid possible race conditions... | |
| 5775 | 225 // FIXME |
| 2974 | 226 // |
| 227 // We probably also don't need to get the library directory | |
| 228 // every time, but since this function is only called when the | |
| 229 // function file is parsed, it probably doesn't matter that | |
| 230 // much. | |
| 231 | |
| 3523 | 232 std::string ff_name = fcn_file_in_path (file_name); |
| 2974 | 233 |
| 3565 | 234 if (Vfcn_file_dir == ff_name.substr (0, Vfcn_file_dir.length ())) |
| 2974 | 235 system_fcn_file = 1; |
| 236 } | |
| 237 else | |
| 238 system_fcn_file = 0; | |
| 239 } | |
| 240 | |
| 241 bool | |
| 242 octave_user_function::takes_varargs (void) const | |
| 243 { | |
| 244 return (param_list && param_list->takes_varargs ()); | |
| 245 } | |
| 246 | |
| 5848 | 247 bool |
| 248 octave_user_function::takes_var_return (void) const | |
| 2974 | 249 { |
| 5848 | 250 return (ret_list && ret_list->takes_varargs ()); |
| 2974 | 251 } |
| 252 | |
|
7761
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
253 void |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
254 octave_user_function::lock_subfunctions (void) |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
255 { |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
256 symbol_table::lock_subfunctions (local_scope); |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
257 } |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
258 |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
259 void |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
260 octave_user_function::unlock_subfunctions (void) |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
261 { |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
262 symbol_table::unlock_subfunctions (local_scope); |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
263 } |
|
5adeea5de26c
symbol table reporting functions
John W. Eaton <jwe@octave.org>
parents:
7752
diff
changeset
|
264 |
| 2974 | 265 octave_value_list |
| 266 octave_user_function::octave_all_va_args (void) | |
| 267 { | |
| 268 octave_value_list retval; | |
| 269 | |
|
8580
188d38a553c7
further indexing optimization touches
Jaroslav Hajek <highegg@gmail.com>
parents:
8142
diff
changeset
|
270 octave_idx_type n = num_args_passed - num_named_args; |
| 2974 | 271 |
| 3178 | 272 if (n > 0) |
|
8580
188d38a553c7
further indexing optimization touches
Jaroslav Hajek <highegg@gmail.com>
parents:
8142
diff
changeset
|
273 retval = args_passed.slice (num_named_args, n); |
| 2974 | 274 |
| 275 return retval; | |
| 276 } | |
| 277 | |
| 278 octave_value_list | |
| 4247 | 279 octave_user_function::subsref (const std::string& type, |
| 4219 | 280 const std::list<octave_value_list>& idx, |
| 3933 | 281 int nargout) |
| 282 { | |
| 283 octave_value_list retval; | |
| 284 | |
| 285 switch (type[0]) | |
| 286 { | |
| 287 case '(': | |
| 5154 | 288 { |
| 5155 | 289 int tmp_nargout = (type.length () > 1 && nargout == 0) ? 1 : nargout; |
| 5154 | 290 |
| 291 retval = do_multi_index_op (tmp_nargout, idx.front ()); | |
| 292 } | |
| 3933 | 293 break; |
| 294 | |
| 295 case '{': | |
| 296 case '.': | |
| 297 { | |
| 298 std::string nm = type_name (); | |
| 299 error ("%s cannot be indexed with %c", nm.c_str (), type[0]); | |
| 300 } | |
| 301 break; | |
| 302 | |
| 303 default: | |
| 304 panic_impossible (); | |
| 305 } | |
| 306 | |
| 5775 | 307 // FIXME -- perhaps there should be an |
| 4059 | 308 // octave_value_list::next_subsref member function? See also |
| 309 // octave_builtin::subsref. | |
| 3933 | 310 |
| 4219 | 311 if (idx.size () > 1) |
| 4994 | 312 retval = retval(0).next_subsref (nargout, type, idx); |
| 4059 | 313 |
| 314 return retval; | |
| 3933 | 315 } |
| 316 | |
| 317 octave_value_list | |
| 3544 | 318 octave_user_function::do_multi_index_op (int nargout, |
| 319 const octave_value_list& args) | |
| 2974 | 320 { |
| 321 octave_value_list retval; | |
| 322 | |
| 323 if (error_state) | |
| 324 return retval; | |
| 325 | |
| 326 if (! cmd_list) | |
| 327 return retval; | |
| 328 | |
| 329 int nargin = args.length (); | |
| 330 | |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
331 unwind_protect::frame_id_t uwp_frame = unwind_protect::begin_frame (); |
| 2974 | 332 |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
333 unwind_protect::protect_var (call_depth); |
| 2974 | 334 call_depth++; |
| 335 | |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7736
diff
changeset
|
336 if (call_depth >= Vmax_recursion_depth) |
| 3131 | 337 { |
| 338 ::error ("max_recursion_limit exceeded"); | |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
339 unwind_protect::run_frame (uwp_frame); |
| 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); |
|
9396
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
347 unwind_protect::add_fcn (octave_call_stack::pop); |
| 7901 | 348 |
|
7752
40c428ea3408
initial implementation of dbup and dbdown
John W. Eaton <jwe@octave.org>
parents:
7736
diff
changeset
|
349 if (call_depth > 0) |
| 2974 | 350 { |
| 7336 | 351 symbol_table::push_context (); |
| 2974 | 352 |
|
9396
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
353 unwind_protect::add_fcn (symbol_table::pop_context); |
| 7336 | 354 } |
| 2974 | 355 |
| 3875 | 356 // Save and restore args passed for recursive calls. |
| 2974 | 357 |
| 3875 | 358 save_args_passed (args); |
| 3239 | 359 |
|
9396
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
360 unwind_protect::add_method (this, &octave_user_function::restore_args_passed); |
| 3239 | 361 |
| 2974 | 362 string_vector arg_names = args.name_tags (); |
| 363 | |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
364 unwind_protect::protect_var (num_args_passed); |
| 2974 | 365 num_args_passed = nargin; |
| 366 | |
| 367 if (param_list && ! param_list->varargs_only ()) | |
| 368 { | |
| 369 param_list->define_from_arg_vector (args); | |
| 370 if (error_state) | |
| 371 goto abort; | |
| 372 } | |
| 373 | |
| 3239 | 374 // Force parameter list to be undefined when this function exits. |
| 375 // Doing so decrements the reference counts on the values of local | |
| 376 // variables that are also named function parameters. | |
| 377 | |
|
9396
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
378 if (param_list) |
|
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
379 unwind_protect::add_method (param_list, |
|
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
380 &tree_parameter_list::undefine); |
| 3239 | 381 |
| 382 // Force return list to be undefined when this function exits. | |
| 383 // Doing so decrements the reference counts on the values of local | |
| 384 // variables that are also named values returned by this function. | |
| 385 | |
|
9396
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
386 if (ret_list) |
|
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
387 unwind_protect::add_method (ret_list, |
|
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
388 &tree_parameter_list::undefine); |
| 3239 | 389 |
|
8142
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
390 if (call_depth == 0) |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
391 { |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
392 // Force symbols to be undefined again when this function |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
393 // exits. |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
394 // |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
395 // This cleanup function is added to the unwind_protect stack |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
396 // after the calls to clear the parameter lists so that local |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
397 // variables will be cleared before the parameter lists are |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
398 // cleared. That way, any function parameters that have been |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
399 // declared global will be unmarked as global before they are |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
400 // undefined by the clear_param_list cleanup function. |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
401 |
|
9396
17af7cce7d1b
yet more unwind_protect improvements
Jaroslav Hajek <highegg@gmail.com>
parents:
9377
diff
changeset
|
402 unwind_protect::add_fcn (symbol_table::clear_variables); |
|
8142
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
403 } |
|
54b41376e381
ov-usr-fcn.cc (octave_user_function::do_multi_index_op): add symbol_table::clear_variables cleanup function to the unwind_protect stack after the parameter list cleanup functions
John W. Eaton <jwe@octave.org>
parents:
8013
diff
changeset
|
404 |
| 2974 | 405 // The following code is in a separate scope to avoid warnings from |
| 406 // G++ about `goto abort' crossing the initialization of some | |
| 407 // variables. | |
| 408 | |
| 409 { | |
| 3974 | 410 bind_automatic_vars (arg_names, nargin, nargout, octave_all_va_args ()); |
| 2974 | 411 |
| 412 bool echo_commands = (Vecho_executing_commands & ECHO_FUNCTIONS); | |
| 413 | |
| 414 if (echo_commands) | |
| 415 print_code_function_header (); | |
| 416 | |
| 417 // Evaluate the commands that make up the function. | |
| 418 | |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
419 unwind_protect::protect_var (tree_evaluator::in_fcn_or_script_body); |
|
8669
33783e94fb16
line number fixes and other evaluator tweaks
John W. Eaton <jwe@octave.org>
parents:
8658
diff
changeset
|
420 tree_evaluator::in_fcn_or_script_body = true; |
| 3489 | 421 |
|
8658
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
422 bool special_expr = (is_inline_function () |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
423 || cmd_list->is_anon_function_body ()); |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
424 |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
425 if (special_expr) |
| 6657 | 426 { |
| 427 assert (cmd_list->length () == 1); | |
| 428 | |
|
8658
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
429 tree_statement *stmt = 0; |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
430 |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
431 if ((stmt = cmd_list->front ()) |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
432 && stmt->is_expression ()) |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
433 { |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
434 tree_expression *expr = stmt->expression (); |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
435 |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
436 retval = expr->rvalue (nargout); |
|
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
437 } |
| 6657 | 438 } |
| 439 else | |
|
8658
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
440 cmd_list->accept (*current_evaluator); |
| 2974 | 441 |
| 442 if (echo_commands) | |
| 443 print_code_function_trailer (); | |
| 444 | |
| 4207 | 445 if (tree_return_command::returning) |
| 446 tree_return_command::returning = 0; | |
| 2974 | 447 |
| 4207 | 448 if (tree_break_command::breaking) |
| 449 tree_break_command::breaking--; | |
| 2974 | 450 |
| 451 if (error_state) | |
|
8013
b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
John W. Eaton <jwe@octave.org>
parents:
8011
diff
changeset
|
452 { |
|
b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
John W. Eaton <jwe@octave.org>
parents:
8011
diff
changeset
|
453 octave_call_stack::backtrace_error_message (); |
|
b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
John W. Eaton <jwe@octave.org>
parents:
8011
diff
changeset
|
454 goto abort; |
|
b3e667f1ab4c
call backtrace_error_message in eval functions, not when popping stack
John W. Eaton <jwe@octave.org>
parents:
8011
diff
changeset
|
455 } |
| 2974 | 456 |
| 457 // Copy return values out. | |
| 458 | |
|
8658
73c4516fae10
New evaluator and debugger derived from tree-walker class
John W. Eaton <jwe@octave.org>
parents:
8580
diff
changeset
|
459 if (ret_list && ! special_expr) |
| 3871 | 460 { |
| 4748 | 461 ret_list->initialize_undefined_elements (my_name, nargout, Matrix ()); |
| 3871 | 462 |
| 5848 | 463 Cell varargout; |
| 464 | |
| 6591 | 465 if (ret_list->takes_varargs ()) |
| 5848 | 466 { |
| 7336 | 467 octave_value varargout_varval = symbol_table::varval ("varargout"); |
| 6591 | 468 |
| 7336 | 469 if (varargout_varval.is_defined ()) |
| 6591 | 470 { |
| 7336 | 471 varargout = varargout_varval.cell_value (); |
| 5848 | 472 |
| 6591 | 473 if (error_state) |
| 474 error ("expecting varargout to be a cell array object"); | |
| 475 } | |
| 5848 | 476 } |
| 477 | |
| 478 if (! error_state) | |
| 479 retval = ret_list->convert_to_const_vector (varargout); | |
| 3871 | 480 } |
| 2974 | 481 } |
| 482 | |
| 483 abort: | |
|
9377
610bf90fce2a
update unwind_protect usage everywhere
Jaroslav Hajek <highegg@gmail.com>
parents:
9144
diff
changeset
|
484 unwind_protect::run_frame (uwp_frame); |
| 2974 | 485 |
| 486 return retval; | |
| 487 } | |
| 488 | |
| 489 void | |
| 490 octave_user_function::accept (tree_walker& tw) | |
| 491 { | |
| 492 tw.visit_octave_user_function (*this); | |
| 493 } | |
| 494 | |
| 7336 | 495 #if 0 |
| 2974 | 496 void |
| 3933 | 497 octave_user_function::print_symtab_info (std::ostream& os) const |
| 498 { | |
| 7336 | 499 symbol_table::print_info (os, local_scope); |
| 3933 | 500 } |
| 7336 | 501 #endif |
| 3933 | 502 |
| 503 void | |
| 2974 | 504 octave_user_function::print_code_function_header (void) |
| 505 { | |
| 5794 | 506 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 507 |
| 508 tpc.visit_octave_user_function_header (*this); | |
| 509 } | |
| 510 | |
| 511 void | |
| 512 octave_user_function::print_code_function_trailer (void) | |
| 513 { | |
| 5794 | 514 tree_print_code tpc (octave_stdout, VPS4); |
| 2974 | 515 |
| 516 tpc.visit_octave_user_function_trailer (*this); | |
| 517 } | |
| 518 | |
| 519 void | |
| 520 octave_user_function::bind_automatic_vars | |
| 3974 | 521 (const string_vector& arg_names, int nargin, int nargout, |
| 522 const octave_value_list& va_args) | |
| 2974 | 523 { |
| 524 if (! arg_names.empty ()) | |
| 7336 | 525 symbol_table::varref ("argn") = arg_names; |
| 2974 | 526 |
| 7336 | 527 symbol_table::varref (".nargin.") = nargin; |
| 528 symbol_table::varref (".nargout.") = nargout; | |
| 529 | |
| 530 symbol_table::mark_hidden (".nargin."); | |
| 531 symbol_table::mark_hidden (".nargout."); | |
| 3974 | 532 |
| 533 if (takes_varargs ()) | |
|
8580
188d38a553c7
further indexing optimization touches
Jaroslav Hajek <highegg@gmail.com>
parents:
8142
diff
changeset
|
534 symbol_table::varref ("varargin") = va_args.cell_value (); |
| 2974 | 535 } |
| 536 | |
| 4700 | 537 DEFUN (nargin, args, , |
| 538 "-*- texinfo -*-\n\ | |
| 539 @deftypefn {Built-in Function} {} nargin ()\n\ | |
| 540 @deftypefnx {Built-in Function} {} nargin (@var{fcn_name})\n\ | |
| 541 Within a function, return the number of arguments passed to the function.\n\ | |
| 542 At the top level, return the number of command line arguments passed to\n\ | |
| 543 Octave. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 544 maximum number of arguments the named function can accept, or -1 if the\n\ | |
| 545 function accepts a variable number of arguments.\n\ | |
| 5642 | 546 @seealso{nargout, varargin, varargout}\n\ |
| 4700 | 547 @end deftypefn") |
| 548 { | |
| 549 octave_value retval; | |
| 550 | |
| 551 int nargin = args.length (); | |
| 552 | |
| 553 if (nargin == 1) | |
| 554 { | |
| 555 std::string fname = args(0).string_value (); | |
| 556 | |
| 557 if (! error_state) | |
| 558 { | |
| 7336 | 559 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 560 |
| 561 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 562 |
| 563 if (fcn) | |
| 564 { | |
| 565 if (fcn->takes_varargs ()) | |
| 566 retval = -1; | |
| 567 else | |
| 568 { | |
| 569 tree_parameter_list *param_list = fcn->parameter_list (); | |
| 570 | |
| 571 retval = param_list ? param_list->length () : 0; | |
| 572 } | |
| 573 } | |
| 574 else | |
| 575 error ("nargin: invalid function"); | |
| 576 } | |
| 577 else | |
| 578 error ("nargin: expecting string as first argument"); | |
| 579 } | |
| 580 else if (nargin == 0) | |
| 581 { | |
| 7336 | 582 retval = symbol_table::varval (".nargin."); |
| 4700 | 583 |
| 7336 | 584 if (retval.is_undefined ()) |
| 585 retval = 0; | |
| 4700 | 586 } |
| 587 else | |
| 5823 | 588 print_usage (); |
| 4700 | 589 |
| 590 return retval; | |
| 591 } | |
| 592 | |
| 593 DEFUN (nargout, args, , | |
| 594 "-*- texinfo -*-\n\ | |
| 595 @deftypefn {Built-in Function} {} nargout ()\n\ | |
| 596 @deftypefnx {Built-in Function} {} nargout (@var{fcn_name})\n\ | |
| 597 Within a function, return the number of values the caller expects to\n\ | |
| 598 receive. If called with the optional argument @var{fcn_name}, return the\n\ | |
| 599 maximum number of values the named function can produce, or -1 if the\n\ | |
| 600 function can produce a variable number of values.\n\ | |
| 601 \n\ | |
| 602 For example,\n\ | |
| 603 \n\ | |
| 604 @example\n\ | |
| 605 f ()\n\ | |
| 606 @end example\n\ | |
| 607 \n\ | |
| 608 @noindent\n\ | |
| 4704 | 609 will cause @code{nargout} to return 0 inside the function @code{f} and\n\ |
| 4700 | 610 \n\ |
| 611 @example\n\ | |
| 612 [s, t] = f ()\n\ | |
| 613 @end example\n\ | |
| 614 \n\ | |
| 615 @noindent\n\ | |
| 616 will cause @code{nargout} to return 2 inside the function\n\ | |
| 617 @code{f}.\n\ | |
| 618 \n\ | |
| 619 At the top level, @code{nargout} is undefined.\n\ | |
| 5642 | 620 @seealso{nargin, varargin, varargout}\n\ |
| 4700 | 621 @end deftypefn") |
| 622 { | |
| 623 octave_value retval; | |
| 624 | |
| 625 int nargin = args.length (); | |
| 626 | |
| 627 if (nargin == 1) | |
| 628 { | |
| 629 std::string fname = args(0).string_value (); | |
| 630 | |
| 631 if (! error_state) | |
| 632 { | |
| 7336 | 633 octave_value fcn_val = symbol_table::find_user_function (fname); |
| 4930 | 634 |
| 635 octave_user_function *fcn = fcn_val.user_function_value (true); | |
| 4700 | 636 |
| 637 if (fcn) | |
| 638 { | |
| 639 if (fcn->takes_var_return ()) | |
| 640 retval = -1; | |
| 641 else | |
| 642 { | |
| 643 tree_parameter_list *ret_list = fcn->return_list (); | |
| 644 | |
| 645 retval = ret_list ? ret_list->length () : 0; | |
| 646 } | |
| 647 } | |
| 648 else | |
| 649 error ("nargout: invalid function"); | |
| 650 } | |
| 651 else | |
| 652 error ("nargout: expecting string as first argument"); | |
| 653 } | |
| 654 else if (nargin == 0) | |
| 655 { | |
| 7336 | 656 if (! symbol_table::at_top_level ()) |
| 4700 | 657 { |
| 7336 | 658 retval = symbol_table::varval (".nargout."); |
| 4700 | 659 |
| 7336 | 660 if (retval.is_undefined ()) |
| 661 retval = 0; | |
| 4700 | 662 } |
| 663 else | |
| 664 error ("nargout: invalid call at top level"); | |
| 665 } | |
| 666 else | |
| 5823 | 667 print_usage (); |
| 4700 | 668 |
| 669 return retval; | |
| 670 } | |
| 671 | |
| 5794 | 672 DEFUN (max_recursion_depth, args, nargout, |
| 673 "-*- texinfo -*-\n\ | |
| 674 @deftypefn {Built-in Function} {@var{val} =} max_recursion_depth ()\n\ | |
| 675 @deftypefnx {Built-in Function} {@var{old_val} =} max_recursion_depth (@var{new_val})\n\ | |
| 676 Query or set the internal limit on the number of times a function may\n\ | |
| 677 be called recursively. If the limit is exceeded, an error message is\n\ | |
| 678 printed and control returns to the top level.\n\ | |
| 679 @end deftypefn") | |
| 3131 | 680 { |
| 5794 | 681 return SET_INTERNAL_VARIABLE (max_recursion_depth); |
| 2974 | 682 } |
| 683 | |
| 684 /* | |
| 685 ;;; Local Variables: *** | |
| 686 ;;; mode: C++ *** | |
| 687 ;;; End: *** | |
| 688 */ |