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1 /* |
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2 |
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2847
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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240
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23 #ifdef HAVE_CONFIG_H |
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1192
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24 #include <config.h> |
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25 #endif |
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26 |
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1343
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27 #include <cstdarg> |
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1633
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28 #include <cstring> |
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1343
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29 |
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3503
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30 #include <strstream> |
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1728
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31 #include <string> |
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32 |
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1352
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33 #include "defun.h" |
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1
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34 #include "error.h" |
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3707
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35 #include "input.h" |
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1742
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36 #include "pager.h" |
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1352
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37 #include "oct-obj.h" |
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38 #include "utils.h" |
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2370
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39 #include "ov.h" |
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3707
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40 #include "ov-usr-fcn.h" |
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41 #include "pt-pr-code.h" |
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42 #include "pt-stmt.h" |
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43 #include "toplev.h" |
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44 #include "unwind-prot.h" |
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2370
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45 #include "variables.h" |
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46 |
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2174
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47 // TRUE means that Octave will try to beep obnoxiously before printing |
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48 // error messages. |
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49 static bool Vbeep_on_error; |
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50 |
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3707
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51 // TRUE means that Octave will try to enter the debugger when an error |
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52 // is encountered. This will also inhibit printing of the normal |
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53 // traceback message (you will only see the top-level error message). |
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54 static bool Vdebug_on_error; |
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55 |
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56 // TRUE means that Octave will try to enter the debugger when a warning |
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57 // is encountered. |
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58 static bool Vdebug_on_warning; |
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59 |
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143
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60 // Current error state. |
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672
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61 int error_state = 0; |
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62 |
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3489
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63 // Current warning state. |
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64 int warning_state = 0; |
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65 |
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1489
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66 // Tell the error handler whether to print messages, or just store |
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67 // them for later. Used for handling errors in eval() and |
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68 // the `unwind_protect' statement. |
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3136
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69 bool buffer_error_messages = false; |
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1489
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70 |
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3811
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71 // The message buffer. |
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72 static std::ostrstream *error_message_buffer = 0; |
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143
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73 |
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3491
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74 // Warning messages are never buffered. |
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75 // XXX FIXME XXX -- we should provide another way to turn them off... |
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76 |
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77 static void |
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78 vwarning (const char *name, const char *fmt, va_list args) |
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79 { |
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80 flush_octave_stdout (); |
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81 |
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3523
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82 std::ostrstream output_buf; |
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3491
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83 |
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84 if (name) |
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3761
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85 output_buf << name << ": "; |
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86 |
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87 octave_vformat (output_buf, fmt, args); |
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88 |
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89 output_buf << std::endl << std::ends; |
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3491
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90 |
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3761
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91 char *msg = output_buf.str (); |
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3491
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92 |
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3761
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93 octave_diary << msg; |
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94 std::cerr << msg; |
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95 |
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96 delete [] msg; |
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3491
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97 } |
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98 |
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99 static void |
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100 verror (const char *name, const char *fmt, va_list args) |
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101 { |
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3585
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102 if (! buffer_error_messages) |
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103 flush_octave_stdout (); |
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914
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104 |
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2174
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105 bool to_beep_or_not_to_beep_p = Vbeep_on_error && ! error_state; |
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1423
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106 |
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3523
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107 std::ostrstream output_buf; |
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108 |
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2174
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109 if (to_beep_or_not_to_beep_p) |
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1423
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110 output_buf << "\a"; |
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3620
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111 |
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599
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112 if (name) |
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113 output_buf << name << ": "; |
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3620
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114 |
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115 octave_vformat (output_buf, fmt, args); |
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116 |
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3538
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117 output_buf << std::endl << std::ends; |
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581
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118 |
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119 char *msg = output_buf.str (); |
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120 |
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1489
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121 if (buffer_error_messages) |
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122 { |
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123 char *ptr = msg; |
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124 |
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125 if (! error_message_buffer) |
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126 { |
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127 error_message_buffer = new std::ostrstream; |
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128 |
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129 // XXX FIXME XXX -- this is ugly, but it prevents |
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130 // |
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131 // eval ("error (\"msg\")", "error (__error_text__)"); |
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132 // |
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133 // from printing `error: ' twice. Assumes that the NAME we |
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134 // have been given doesn't contain `:'. |
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135 |
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3162
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136 ptr = strchr (msg, ':'); |
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137 |
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138 if (ptr) |
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139 { |
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140 if (*++ptr != '\0') |
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141 ++ptr; |
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142 } |
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143 else |
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144 ptr = msg; |
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1489
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145 } |
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146 |
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147 *error_message_buffer << ptr; |
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148 } |
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149 else |
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150 { |
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2095
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151 octave_diary << msg; |
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3531
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152 std::cerr << msg; |
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1489
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153 } |
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581
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154 |
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155 delete [] msg; |
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1
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156 } |
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157 |
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1266
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158 // Note that we don't actually print any message if the error string |
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159 // is just "" or "\n". This allows error ("") and error ("\n") to |
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160 // just set the error state. |
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161 |
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1005
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162 static void |
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163 error_1 (const char *name, const char *fmt, va_list args) |
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164 { |
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165 if (error_state != -2) |
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166 { |
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1489
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167 if (fmt) |
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1005
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168 { |
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1489
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169 if (*fmt) |
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1005
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170 { |
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1489
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171 int len = strlen (fmt); |
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172 if (fmt[len - 1] == '\n') |
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1266
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173 { |
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1489
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174 if (len > 1) |
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1266
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175 { |
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1489
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176 char *tmp_fmt = strsave (fmt); |
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177 tmp_fmt[len - 1] = '\0'; |
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178 verror (name, tmp_fmt, args); |
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179 delete [] tmp_fmt; |
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180 } |
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1423
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181 |
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1489
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182 error_state = -2; |
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1266
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183 } |
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1489
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184 else |
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185 verror (name, fmt, args); |
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1005
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186 } |
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187 } |
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1489
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188 else |
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189 panic ("error_1: invalid format"); |
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1423
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190 |
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191 if (! error_state) |
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192 error_state = 1; |
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1005
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193 } |
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194 } |
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195 |
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1
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196 void |
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197 message (const char *name, const char *fmt, ...) |
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198 { |
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199 va_list args; |
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200 va_start (args, fmt); |
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201 verror (name, fmt, args); |
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202 va_end (args); |
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203 } |
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204 |
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205 void |
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206 usage (const char *fmt, ...) |
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207 { |
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208 va_list args; |
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209 va_start (args, fmt); |
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905
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210 error_state = -1; |
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211 verror ("usage", fmt, args); |
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212 va_end (args); |
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213 } |
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214 |
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3707
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215 static void |
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3719
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216 pr_where_2 (const char *fmt, va_list args) |
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217 { |
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218 if (fmt) |
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219 { |
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220 if (*fmt) |
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221 { |
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222 int len = strlen (fmt); |
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223 if (fmt[len - 1] == '\n') |
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224 { |
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225 if (len > 1) |
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226 { |
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227 char *tmp_fmt = strsave (fmt); |
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228 tmp_fmt[len - 1] = '\0'; |
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229 verror (0, tmp_fmt, args); |
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230 delete [] tmp_fmt; |
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231 } |
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232 } |
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233 else |
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234 verror (0, fmt, args); |
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235 } |
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236 } |
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237 else |
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238 panic ("pr_where_2: invalid format"); |
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239 } |
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240 |
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241 static void |
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3707
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242 pr_where_1 (const char *fmt, ...) |
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243 { |
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244 va_list args; |
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245 va_start (args, fmt); |
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3719
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246 pr_where_2 (fmt, args); |
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3707
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247 va_end (args); |
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248 } |
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249 |
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250 static void |
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3708
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251 pr_where (const char *name) |
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3707
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252 { |
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253 if (curr_statement) |
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254 { |
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3708
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255 const char *f_nm = 0; |
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3707
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256 |
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3708
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257 if (curr_function) |
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258 { |
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259 std::string fcn_name = curr_function->function_name (); |
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260 std::string file_name = curr_function->fcn_file_name (); |
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261 |
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262 f_nm = file_name.empty () ? fcn_name.c_str () : file_name.c_str (); |
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263 } |
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3707
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264 |
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265 int l = curr_statement->line (); |
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266 int c = curr_statement->column (); |
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267 |
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3708
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268 if (f_nm) |
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269 pr_where_1 ("%s: in %s near line %d, column %d:", name, f_nm, l, c); |
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270 else |
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271 pr_where_1 ("%s: near line %d, column %d:", name, l, c); |
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3707
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272 |
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3708
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273 // XXX FIXME XXX -- Note that the column number is probably not |
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274 // going to mean much here since the code is being reproduced |
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275 // from the parse tree, and we are only showing one statement |
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276 // even if there were multiple statements on the original source |
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277 // line. |
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3707
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278 |
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279 std::ostrstream output_buf; |
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280 |
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3764
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281 output_buf << std::endl; |
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3708
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282 |
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283 tree_print_code tpc (output_buf, ">>> "); |
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3707
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284 |
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285 curr_statement->accept (tpc); |
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286 |
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3764
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287 output_buf << std::endl << std::ends; |
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3707
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288 |
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289 char *msg = output_buf.str (); |
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290 |
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3764
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291 pr_where_1 ("%s", msg); |
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3707
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292 |
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293 delete [] msg; |
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294 } |
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295 } |
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296 |
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1
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297 void |
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298 warning (const char *fmt, ...) |
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299 { |
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300 va_list args; |
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301 va_start (args, fmt); |
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3489
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302 warning_state = 1; |
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3491
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303 vwarning ("warning", fmt, args); |
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1
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304 va_end (args); |
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3707
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305 |
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3708
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306 pr_where ("warning"); |
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307 |
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3707
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308 if ((interactive || forced_interactive) |
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309 && Vdebug_on_warning && curr_function) |
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310 { |
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311 unwind_protect_bool (Vdebug_on_warning); |
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312 Vdebug_on_warning = false; |
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313 |
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314 do_keyboard (octave_value_list ()); |
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315 |
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316 unwind_protect::run (); |
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317 } |
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1
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318 } |
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319 |
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320 void |
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321 error (const char *fmt, ...) |
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322 { |
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3707
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323 int init_state = error_state; |
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324 |
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1
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325 va_list args; |
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326 va_start (args, fmt); |
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1005
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327 error_1 ("error", fmt, args); |
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328 va_end (args); |
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3707
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329 |
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330 if ((interactive || forced_interactive) |
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331 && Vdebug_on_error && init_state == 0 && curr_function) |
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332 { |
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333 unwind_protect_bool (Vdebug_on_error); |
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334 Vdebug_on_error = false; |
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335 |
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3708
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336 pr_where ("error"); |
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3707
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337 |
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338 error_state = 0; |
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339 |
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340 do_keyboard (octave_value_list ()); |
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341 |
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342 unwind_protect::run (); |
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343 } |
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1005
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344 } |
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436
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345 |
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1005
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346 void |
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347 parse_error (const char *fmt, ...) |
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348 { |
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349 va_list args; |
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350 va_start (args, fmt); |
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351 error_1 (0, fmt, args); |
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1
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352 va_end (args); |
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353 } |
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354 |
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189
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355 void |
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1
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356 panic (const char *fmt, ...) |
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357 { |
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358 va_list args; |
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359 va_start (args, fmt); |
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3585
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360 buffer_error_messages = false; |
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1
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361 verror ("panic", fmt, args); |
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362 va_end (args); |
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363 abort (); |
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364 } |
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365 |
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1489
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366 typedef void (*error_fun)(const char *, ...); |
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367 |
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2086
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368 extern octave_value_list Fsprintf (const octave_value_list&, int); |
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1489
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369 |
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2086
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370 static octave_value_list |
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371 handle_message (error_fun f, const char *msg, const octave_value_list& args) |
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528
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372 { |
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2086
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373 octave_value_list retval; |
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528
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374 |
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3523
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375 std::string tstr; |
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1728
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376 |
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528
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377 int nargin = args.length (); |
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378 |
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2745
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379 if (nargin > 0) |
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528
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380 { |
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3066
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381 octave_value arg; |
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382 |
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383 if (nargin > 1) |
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384 { |
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385 octave_value_list tmp = Fsprintf (args, 1); |
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386 arg = tmp(0); |
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387 } |
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388 else |
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389 arg = args(0); |
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2745
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390 |
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391 if (arg.is_defined ()) |
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528
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392 { |
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2745
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393 if (arg.is_string ()) |
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394 { |
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395 tstr = arg.string_value (); |
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396 msg = tstr.c_str (); |
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397 |
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398 if (! msg) |
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399 return retval; |
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400 } |
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401 else if (arg.is_empty ()) |
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528
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402 return retval; |
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403 } |
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404 } |
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405 |
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1489
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406 // Ugh. |
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407 |
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408 int len = strlen (msg); |
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409 if (msg[len - 1] == '\n') |
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410 { |
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411 if (len > 1) |
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412 { |
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413 char *tmp_msg = strsave (msg); |
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414 tmp_msg[len - 1] = '\0'; |
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415 f ("%s\n", tmp_msg); |
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416 delete [] tmp_msg; |
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417 } |
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418 } |
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419 else |
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420 f ("%s", msg); |
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528
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421 |
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422 return retval; |
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423 } |
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424 |
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1957
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425 DEFUN (error, args, , |
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3373
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426 "-*- texinfo -*-\n\ |
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427 @deftypefn {Built-in Function} {} error (@var{template}, @dots{})\n\ |
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428 The @code{error} function formats the optional arguments under the\n\ |
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429 control of the template string @var{template} using the same rules as\n\ |
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430 the @code{printf} family of functions (@pxref{Formatted Output}).\n\ |
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431 The resulting message is prefixed by the string @samp{error: } and\n\ |
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432 printed on the @code{stderr} stream.\n\ |
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433 \n\ |
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434 Calling @code{error} also sets Octave's internal error state such that\n\ |
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435 control will return to the top level without evaluating any more\n\ |
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436 commands. This is useful for aborting from functions or scripts.\n\ |
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897
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437 \n\ |
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3373
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438 If the error message does not end with a new line character, Octave will\n\ |
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439 print a traceback of all the function calls leading to the error. For\n\ |
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440 example, given the following function definitions:\n\ |
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441 \n\ |
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442 @example\n\ |
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443 @group\n\ |
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444 function f () g () end\n\ |
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445 function g () h () end\n\ |
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446 function h () nargin == 1 || error (\"nargin != 1\"); end\n\ |
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447 @end group\n\ |
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448 @end example\n\ |
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1489
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449 \n\ |
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3373
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450 @noindent\n\ |
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451 calling the function @code{f} will result in a list of messages that\n\ |
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452 can help you to quickly locate the exact location of the error:\n\ |
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1489
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453 \n\ |
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3373
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454 @example\n\ |
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455 @group\n\ |
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456 f ()\n\ |
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457 error: nargin != 1\n\ |
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458 error: evaluating index expression near line 1, column 30\n\ |
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459 error: evaluating binary operator `||' near line 1, column 27\n\ |
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460 error: called from `h'\n\ |
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461 error: called from `g'\n\ |
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462 error: called from `f'\n\ |
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463 @end group\n\ |
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464 @end example\n\ |
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465 \n\ |
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466 If the error message ends in a new line character, Octave will print the\n\ |
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467 message but will not display any traceback messages as it returns\n\ |
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468 control to the top level. For example, modifying the error message\n\ |
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469 in the previous example to end in a new line causes Octave to only print\n\ |
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470 a single message:\n\ |
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471 \n\ |
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472 @example\n\ |
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473 @group\n\ |
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474 function h () nargin == 1 || error (\"nargin != 1\\n\"); end\n\ |
|
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475 f ()\n\ |
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476 error: nargin != 1\n\ |
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477 @end group\n\ |
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478 @end example\n\ |
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479 @end deftypefn") |
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897
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480 { |
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1489
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481 return handle_message (error, "unspecified error", args); |
|
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482 } |
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897
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483 |
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1957
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484 DEFUN (warning, args, , |
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3373
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485 "-*- texinfo -*-\n\ |
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486 @deftypefn {Built-in Function} {} warning (@var{msg})\n\ |
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487 Print a warning message @var{msg} prefixed by the string @samp{warning: }. \n\ |
|
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488 After printing the warning message, Octave will continue to execute\n\ |
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3600
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489 commands. You should use this function when you want to notify the user\n\ |
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490 of an unusual condition, but only when it makes sense for your program\n\ |
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491 to go on.\n\ |
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3373
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492 @end deftypefn") |
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1489
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493 { |
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494 return handle_message (warning, "unspecified warning", args); |
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897
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495 } |
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496 |
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1957
|
497 DEFUN (usage, args, , |
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3373
|
498 "-*- texinfo -*-\n\ |
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499 @deftypefn {Built-in Function} {} usage (@var{msg})\n\ |
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500 Print the message @var{msg}, prefixed by the string @samp{usage: }, and\n\ |
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501 set Octave's internal error state such that control will return to the\n\ |
|
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502 top level without evaluating any more commands. This is useful for\n\ |
|
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503 aborting from functions.\n\ |
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504 \n\ |
|
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505 After @code{usage} is evaluated, Octave will print a traceback of all\n\ |
|
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506 the function calls leading to the usage message.\n\ |
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899
|
507 \n\ |
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3373
|
508 You should use this function for reporting problems errors that result\n\ |
|
|
509 from an improper call to a function, such as calling a function with an\n\ |
|
|
510 incorrect number of arguments, or with arguments of the wrong type. For\n\ |
|
|
511 example, most functions distributed with Octave begin with code like\n\ |
|
|
512 this\n\ |
|
|
513 \n\ |
|
|
514 @example\n\ |
|
|
515 @group\n\ |
|
|
516 if (nargin != 2)\n\ |
|
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517 usage (\"foo (a, b)\");\n\ |
|
|
518 endif\n\ |
|
|
519 @end group\n\ |
|
|
520 @end example\n\ |
|
|
521 \n\ |
|
|
522 @noindent\n\ |
|
|
523 to check for the proper number of arguments.\n\ |
|
|
524 @end deftypefn") |
|
899
|
525 { |
|
1489
|
526 return handle_message (usage, "unknown", args); |
|
899
|
527 } |
|
|
528 |
|
3018
|
529 void |
|
|
530 bind_global_error_variable (void) |
|
|
531 { |
|
3490
|
532 if (error_message_buffer) |
|
|
533 { |
|
3538
|
534 *error_message_buffer << std::ends; |
|
3018
|
535 |
|
3490
|
536 char *error_text = error_message_buffer->str (); |
|
3018
|
537 |
|
3811
|
538 bind_builtin_variable ("__error_text__", error_text, true); |
|
3018
|
539 |
|
3490
|
540 delete [] error_text; |
|
|
541 |
|
|
542 delete error_message_buffer; |
|
3018
|
543 |
|
3490
|
544 error_message_buffer = 0; |
|
|
545 } |
|
|
546 else |
|
3811
|
547 bind_builtin_variable ("__error_text__", "", true); |
|
3018
|
548 } |
|
|
549 |
|
|
550 void |
|
|
551 clear_global_error_variable (void *) |
|
|
552 { |
|
|
553 delete error_message_buffer; |
|
3811
|
554 |
|
3018
|
555 error_message_buffer = 0; |
|
|
556 |
|
3811
|
557 bind_builtin_variable ("__error_text__", "", true); |
|
3018
|
558 } |
|
|
559 |
|
2174
|
560 static int |
|
|
561 beep_on_error (void) |
|
|
562 { |
|
|
563 Vbeep_on_error = check_preference ("beep_on_error"); |
|
|
564 |
|
|
565 return 0; |
|
|
566 } |
|
|
567 |
|
3707
|
568 static int |
|
|
569 debug_on_error (void) |
|
|
570 { |
|
|
571 Vdebug_on_error = check_preference ("debug_on_error"); |
|
|
572 |
|
|
573 return 0; |
|
|
574 } |
|
|
575 |
|
|
576 static int |
|
|
577 debug_on_warning (void) |
|
|
578 { |
|
|
579 Vdebug_on_warning = check_preference ("debug_on_warning"); |
|
|
580 |
|
|
581 return 0; |
|
|
582 } |
|
|
583 |
|
2174
|
584 void |
|
|
585 symbols_of_error (void) |
|
|
586 { |
|
3258
|
587 DEFVAR (beep_on_error, 0.0, beep_on_error, |
|
3373
|
588 "-*- texinfo -*-\n\ |
|
|
589 @defvr {Built-in Variable} beep_on_error\n\ |
|
|
590 If the value of @code{beep_on_error} is nonzero, Octave will try\n\ |
|
|
591 to ring your terminal's bell before printing an error message. The\n\ |
|
|
592 default value is 0.\n\ |
|
|
593 @end defvr"); |
|
3018
|
594 |
|
3707
|
595 DEFVAR (debug_on_error, 0.0, debug_on_error, |
|
|
596 "-*- texinfo -*-\n\ |
|
|
597 @defvr {Built-in Variable} debug_on_error\n\ |
|
|
598 If the value of @code{debug_on_error} is nonzero, Octave will try\n\ |
|
|
599 to enter the debugger when an error is encountered. This will also\n\ |
|
|
600 inhibit printing of the normal traceback message (you will only see\n\ |
|
|
601 the top-level error message). The default value is 0.\n\ |
|
|
602 @end defvr"); |
|
|
603 |
|
|
604 DEFVAR (debug_on_warning, 0.0, debug_on_warning, |
|
|
605 "-*- texinfo -*-\n\ |
|
|
606 @defvr {Built-in Variable} debug_on_warning\n\ |
|
|
607 If the value of @code{debug_on_warning} is nonzero, Octave will try\n\ |
|
|
608 to enter the debugger when a warning is encountered. The default\n\ |
|
|
609 value is 0.\n\ |
|
|
610 @end defvr"); |
|
|
611 |
|
3141
|
612 DEFCONST (error_text, "", |
|
3373
|
613 "-*- texinfo -*-\n\ |
|
|
614 @defvr {Built-in Variable} error_text\n\ |
|
|
615 This variable contains the text of error messages that would have\n\ |
|
|
616 been printed in the body of the most recent @code{unwind_protect} or\n\ |
|
|
617 @code{try} statement or the @var{try} part of the most recent call to\n\ |
|
|
618 the @code{eval} function. Outside of the @code{unwind_protect} and\n\ |
|
|
619 @code{try} statements or the @code{eval} function, or if no error has\n\ |
|
|
620 occurred within them, the value of @code{error_text} is guaranteed to be\n\ |
|
|
621 the empty string.\n\ |
|
|
622 \n\ |
|
|
623 Note that the message does not include the first @samp{error: } prefix,\n\ |
|
|
624 so that it may easily be passed to the @code{error} function without\n\ |
|
|
625 additional processing@footnote{Yes, it's a kluge, but it seems to be a\n\ |
|
|
626 reasonably useful one.}.\n\ |
|
|
627 \n\ |
|
3402
|
628 @xref{The try Statement}, and @ref{The unwind_protect Statement}.\n\ |
|
3373
|
629 @end defvr"); |
|
2174
|
630 } |
|
|
631 |
|
1
|
632 /* |
|
|
633 ;;; Local Variables: *** |
|
|
634 ;;; mode: C++ *** |
|
|
635 ;;; End: *** |
|
|
636 */ |
