Mercurial > hg > octave-thorsten
annotate src/pt-stmt.cc @ 7752:40c428ea3408
initial implementation of dbup and dbdown
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Sun, 04 May 2008 03:42:19 -0400 |
| parents | a059b5679fbb |
| children | 71f068b22fcc |
| rev | line source |
|---|---|
| 2982 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1996, 1997, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
| 4 2006, 2007 John W. Eaton | |
| 2982 | 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. | |
| 2982 | 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/>. | |
| 2982 | 21 |
| 22 */ | |
| 23 | |
| 24 #ifdef HAVE_CONFIG_H | |
| 25 #include <config.h> | |
| 26 #endif | |
| 27 | |
| 4153 | 28 #include "quit.h" |
| 29 | |
| 2982 | 30 #include "defun.h" |
| 31 #include "error.h" | |
| 32 #include "ov.h" | |
| 33 #include "oct-lvalue.h" | |
| 34 #include "input.h" | |
| 35 #include "pager.h" | |
| 3770 | 36 #include "pt-bp.h" |
| 2982 | 37 #include "pt-cmd.h" |
| 38 #include "pt-id.h" | |
| 39 #include "pt-idx.h" | |
| 2985 | 40 #include "pt-jump.h" |
| 2982 | 41 #include "pt-pr-code.h" |
| 42 #include "pt-stmt.h" | |
| 43 #include "pt-walk.h" | |
| 3707 | 44 #include "unwind-prot.h" |
| 2982 | 45 #include "utils.h" |
| 46 #include "variables.h" | |
| 47 | |
| 48 // A list of commands to be executed. | |
| 49 | |
| 50 tree_statement::~tree_statement (void) | |
| 51 { | |
| 52 delete cmd; | |
| 53 delete expr; | |
| 3665 | 54 delete comm; |
| 2982 | 55 } |
| 56 | |
| 57 int | |
| 58 tree_statement::line (void) | |
| 59 { | |
| 60 return cmd ? cmd->line () : (expr ? expr->line () : -1); | |
| 61 } | |
| 62 | |
| 63 int | |
| 64 tree_statement::column (void) | |
| 65 { | |
| 66 return cmd ? cmd->column () : (expr ? expr->column () : -1); | |
| 67 } | |
| 68 | |
| 69 void | |
| 7736 | 70 tree_statement::maybe_echo_code (bool in_function_or_script_body) |
| 2982 | 71 { |
| 7736 | 72 if (in_function_or_script_body |
| 2982 | 73 && (Vecho_executing_commands & ECHO_FUNCTIONS)) |
| 74 { | |
| 5794 | 75 tree_print_code tpc (octave_stdout, VPS4); |
| 2982 | 76 |
| 77 accept (tpc); | |
| 78 } | |
| 79 } | |
| 80 | |
| 81 octave_value_list | |
| 7736 | 82 tree_statement::eval (bool silent, int nargout, |
| 83 bool in_function_or_script_body) | |
| 2982 | 84 { |
| 85 octave_value_list retval; | |
| 86 | |
| 87 bool pf = silent ? false : print_flag; | |
| 88 | |
| 89 if (cmd || expr) | |
| 90 { | |
|
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91 if (! (symbol_table::at_top_level () || Vdebugging)) |
| 7736 | 92 octave_call_stack::set_statement (this); |
| 3708 | 93 |
| 7736 | 94 maybe_echo_code (in_function_or_script_body); |
| 2982 | 95 |
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96 try |
| 2982 | 97 { |
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98 if (cmd) |
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99 cmd->eval (); |
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100 else |
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101 { |
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102 expr->set_print_flag (pf); |
| 2982 | 103 |
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104 // FIXME -- maybe all of this should be packaged in |
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105 // one virtual function that returns a flag saying whether |
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106 // or not the expression will take care of binding ans and |
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107 // printing the result. |
| 2982 | 108 |
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109 // FIXME -- it seems that we should just have to |
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110 // call expr->rvalue () and that should take care of |
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111 // everything, binding ans as necessary? |
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112 |
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113 bool do_bind_ans = false; |
| 4203 | 114 |
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115 if (expr->is_identifier ()) |
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116 { |
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117 tree_identifier *id = dynamic_cast<tree_identifier *> (expr); |
| 2982 | 118 |
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119 do_bind_ans = (! id->is_variable ()); |
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120 } |
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121 else |
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122 do_bind_ans = (! expr->is_assignment_expression ()); |
| 2982 | 123 |
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124 retval = expr->rvalue (nargout); |
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125 |
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126 if (do_bind_ans && ! (error_state || retval.empty ())) |
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127 bind_ans (retval(0), pf); |
| 2982 | 128 } |
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129 } |
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130 catch (octave_execution_exception) |
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131 { |
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132 octave_exception_state = octave_no_exception; |
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133 error ("caught execution error in library function"); |
| 2982 | 134 } |
| 135 } | |
| 136 | |
| 137 return retval; | |
| 138 } | |
| 139 | |
| 5861 | 140 tree_statement * |
| 7336 | 141 tree_statement::dup (symbol_table::scope_id scope) |
| 5861 | 142 { |
| 143 tree_statement *new_stmt = new tree_statement (); | |
| 144 | |
| 7336 | 145 new_stmt->cmd = cmd ? cmd->dup (scope) : 0; |
| 5861 | 146 |
| 7336 | 147 new_stmt->expr = expr ? expr->dup (scope) : 0; |
| 5861 | 148 |
| 149 new_stmt->comm = comm ? comm->dup () : 0; | |
| 150 | |
| 151 new_stmt->print_flag = print_flag; | |
| 152 | |
| 153 return new_stmt; | |
| 154 } | |
| 155 | |
| 2982 | 156 void |
| 157 tree_statement::accept (tree_walker& tw) | |
| 158 { | |
| 159 tw.visit_statement (*this); | |
| 160 } | |
| 161 | |
| 162 octave_value_list | |
| 163 tree_statement_list::eval (bool silent, int nargout) | |
| 164 { | |
| 165 octave_value_list retval; | |
| 166 | |
| 5858 | 167 static octave_value_list empty_list; |
| 168 | |
| 2982 | 169 if (error_state) |
| 170 return retval; | |
| 171 | |
| 5858 | 172 iterator p = begin (); |
| 2982 | 173 |
| 5858 | 174 if (p != end ()) |
| 175 { | |
| 176 while (true) | |
| 2982 | 177 { |
| 5858 | 178 tree_statement *elt = *p++; |
| 179 | |
| 180 if (elt) | |
| 181 { | |
| 182 OCTAVE_QUIT; | |
| 4153 | 183 |
| 7736 | 184 retval = elt->eval (silent, nargout, |
| 185 function_body || script_body); | |
| 5858 | 186 |
| 187 if (error_state) | |
| 188 break; | |
| 189 | |
| 190 if (tree_break_command::breaking | |
| 191 || tree_continue_command::continuing) | |
| 192 break; | |
| 193 | |
| 194 if (tree_return_command::returning) | |
| 195 break; | |
| 5855 | 196 |
| 5858 | 197 if (p == end ()) |
| 198 break; | |
| 199 else | |
| 200 { | |
| 201 // Clear preivous values before next statement is | |
| 202 // evaluated so that we aren't holding an extra | |
| 203 // reference to a value that may be used next. For | |
| 204 // example, in code like this: | |
| 205 // | |
| 206 // X = rand (N); ## refcount for X should be 1 | |
| 207 // ## after this statement | |
| 208 // | |
| 209 // X(idx) = val; ## no extra copy of X should be | |
| 210 // ## needed, but we will be faked | |
| 211 // ## out if retval is not cleared | |
| 212 // ## between statements here | |
| 2982 | 213 |
| 5858 | 214 retval = empty_list; |
| 215 } | |
| 216 } | |
| 217 else | |
| 218 error ("invalid statement found in statement list!"); | |
| 2982 | 219 } |
| 220 } | |
| 221 | |
| 222 return retval; | |
| 223 } | |
| 224 | |
| 3770 | 225 int |
| 226 tree_statement_list::set_breakpoint (int line) | |
| 227 { | |
| 228 tree_breakpoint tbp (line, tree_breakpoint::set); | |
| 229 accept (tbp); | |
| 230 | |
| 231 return tbp.get_line (); | |
| 232 } | |
| 233 | |
| 234 void | |
| 235 tree_statement_list::delete_breakpoint (int line) | |
| 236 { | |
| 3895 | 237 if (line < 0) |
| 238 { | |
| 4212 | 239 octave_value_list bp_lst = list_breakpoints (); |
| 3895 | 240 |
| 4212 | 241 int len = bp_lst.length (); |
| 3895 | 242 |
| 4587 | 243 for (int i = 0; i < len; i++) |
| 3895 | 244 { |
| 4587 | 245 tree_breakpoint tbp (i, tree_breakpoint::clear); |
| 3895 | 246 accept (tbp); |
| 247 } | |
| 248 } | |
| 249 else | |
| 250 { | |
| 251 tree_breakpoint tbp (line, tree_breakpoint::clear); | |
| 252 accept (tbp); | |
| 253 } | |
| 3770 | 254 } |
| 255 | |
| 256 octave_value_list | |
| 257 tree_statement_list::list_breakpoints (void) | |
| 258 { | |
| 259 tree_breakpoint tbp (0, tree_breakpoint::list); | |
| 260 accept (tbp); | |
| 261 | |
| 262 return tbp.get_list (); | |
| 263 } | |
| 264 | |
| 5861 | 265 tree_statement_list * |
| 7336 | 266 tree_statement_list::dup (symbol_table::scope_id scope) |
| 5861 | 267 { |
| 268 tree_statement_list *new_list = new tree_statement_list (); | |
| 269 | |
| 270 new_list->function_body = function_body; | |
| 271 | |
| 272 for (iterator p = begin (); p != end (); p++) | |
| 273 { | |
| 274 tree_statement *elt = *p; | |
| 275 | |
| 7336 | 276 new_list->append (elt ? elt->dup (scope) : 0); |
| 5861 | 277 } |
| 278 | |
| 279 return new_list; | |
| 280 } | |
| 281 | |
| 2982 | 282 void |
| 283 tree_statement_list::accept (tree_walker& tw) | |
| 284 { | |
| 285 tw.visit_statement_list (*this); | |
| 286 } | |
| 287 | |
| 288 /* | |
| 289 ;;; Local Variables: *** | |
| 290 ;;; mode: C++ *** | |
| 291 ;;; End: *** | |
| 292 */ |