Mercurial > octave
annotate libinterp/corefcn/error.h @ 27471:fd32c1a9b1bd
revamp error handling
In "error" and similar functions that ultimately call it, simply throw
an exception that contains information about the error (message, id,
stack info) instead of printing an error message immediately and then
throwing an exception. The new approach is more flexible and sllows
for some simplification of the error message routines as they no
longer need feedback from the interpreter to know when to display or
buffer messages. It is now the responsibility of any code that
catches an execution exception to determine whether and when to
display error messages.
* quit.h, quit.cc (class frame_info): New class.
(execution_exception::m_err_type, execution_exception::m_id,
execution_exception::m_message, execution_exception::m_stack_info):
New data members.
(class execution_exception): Store error type, message, id, and stack
info. Provide methods setting and accessing data as needed and for
generating stack trace message from stack info.
(execution_exception::m_stack_trace): Delete data member.
execution_exception::set_stack_trace): Delete method.
(execution_exception::set_err_type, execution_exception::err_type,
execution_exception::stack_trace, execution_exception::set_identifier,
execution_exception::identifier, execution_exception::message,
execution_exception::set_stack_info, execution_exception::display):
New methods.
* call-stack.cc, call-stack.h (call_stack::backtrace_info):
New functions.
* oct-parse.yy (maybe_print_last_error_message): Delete function and
all uses.
* pt-eval.h, pt-eval.cc (tree_evaluator::backtrace_info,
tree_evaluator::backtrace_message): New functions.
(tree_evaluator::backtrace): Now const.
(tree_evaluator::visit_unwind_protect_command,
tree_evaluator::do_unwind_protect_cleanup_code,
tree_evaluator::visit_try_catch_command, tree_evaluator::evalin,
tree_evaluator::eval, tree_evaluator::repl, debugger::repl): Save
current exception info.
* interpreter.h, interpreter.cc (interpreter::handle_exception):
New function. Use it in place of direct calls to
error_system::save_exception, error_system::display_exception (or
execution_exception::display) and interpreter::recover_from_exception,
so that we have uniform behavior when responding to an execution
exception.
* error.h, error.cc (error_system::m_buffer_error_messages,
error_system::m_discard_error_messages, error_system::m_in_try_catch):
Delete data members and associated functions. Remove all uses.
Because the error system no longer displays messages immediately,
it does not need to track whether to discard or buffer error messages
or know whether error and warning functions are invoked inside of
try-catch blocks. Everywhere that catches execution_exceptions must
now handle saving the exception state (for lasterror) and displaying
the error message and traceback as needed.
(): Delete functions and all uses.
(error_stack_frame): Delete struct definition.
(verror, vpr_where, pr_where_internal, pr_where, maybe_enter_debugger,
make_execution_exception, vmessage_with_id, message_with_id,
error_system::maybe_enter_debugger, reset_error_handler,
error_system::reset): Delete functions and all uses.
(error_system::try_option): Delete enum and all uses.
(vusage, error_1, error_system::vwarning,
error_system::rethrow_error, error_system::interpreter_try):
Simplify.
(format_message, make_stack_map, error_system::throw_error,
error_system::save_exception, error_system::display_exception):
New functions.
(Ferror): Update for error_system changes.
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 04 Oct 2019 01:15:13 -0400 |
parents | 7883e6e71b0a |
children | c0883bfc0f36 |
rev | line source |
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1 | 1 /* |
2 | |
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3 Copyright (C) 1993-2019 John W. Eaton |
1 | 4 |
5 This file is part of Octave. | |
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 |
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9 the Free Software Foundation, either version 3 of the License, or |
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10 (at your option) any later version. |
1 | 11 |
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12 Octave is distributed in the hope that it will be useful, but |
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13 WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 GNU General Public License for more details. |
1 | 16 |
17 You should have received a copy of the GNU General Public License | |
7016 | 18 along with Octave; see the file COPYING. If not, see |
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19 <https://www.gnu.org/licenses/>. |
1 | 20 |
21 */ | |
22 | |
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23 #if ! defined (octave_error_h) |
383 | 24 #define octave_error_h 1 |
1 | 25 |
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26 #include "octave-config.h" |
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27 |
6355 | 28 #include <cstdarg> |
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29 #include <cinttypes> |
3935 | 30 #include <string> |
1489 | 31 |
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32 #include "unwind-prot.h" |
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33 |
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34 #include "oct-map.h" |
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35 |
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36 class octave_value_list; |
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37 namespace octave |
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38 { |
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39 class execution_exception; |
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40 } |
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41 |
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42 namespace octave |
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43 { |
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44 class error_system |
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45 { |
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46 public: |
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47 |
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48 error_system (interpreter& interp); |
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49 |
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50 error_system (const error_system&) = delete; |
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51 |
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52 error_system& operator = (const error_system&) = delete; |
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53 |
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54 ~error_system (void) = default; |
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55 |
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56 octave_value debug_on_error (const octave_value_list& args, int nargout); |
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57 |
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58 void set_debug_on_error (bool flag) { m_debug_on_error = flag; } |
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59 |
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60 bool debug_on_error (void) const { return m_debug_on_error; } |
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61 |
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62 bool debug_on_error (bool flag) |
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63 { |
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64 bool val = m_debug_on_error; |
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65 m_debug_on_error = flag; |
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66 return val; |
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67 } |
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68 |
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69 octave_value debug_on_caught (const octave_value_list& args, int nargout); |
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70 |
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71 void set_debug_on_caught (bool flag) { m_debug_on_caught = flag; } |
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72 |
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73 bool debug_on_caught (void) const { return m_debug_on_caught; } |
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74 |
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75 bool debug_on_caught (bool flag) |
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76 { |
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77 bool val = m_debug_on_caught; |
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78 m_debug_on_caught = flag; |
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79 return val; |
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80 } |
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81 |
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82 octave_value debug_on_warning (const octave_value_list& args, int nargout); |
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83 |
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84 void set_debug_on_warning (bool flag) { m_debug_on_warning = flag; } |
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85 |
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86 bool debug_on_warning (void) const { return m_debug_on_warning; } |
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87 |
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88 bool debug_on_warning (bool flag) |
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89 { |
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90 bool val = m_debug_on_warning; |
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91 m_debug_on_warning = flag; |
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92 return val; |
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93 } |
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94 |
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95 octave_value discard_warning_messages (const octave_value_list& args, int nargout); |
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96 |
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97 void set_discard_warning_messages (bool flag) { m_discard_warning_messages = flag; } |
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98 |
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99 bool discard_warning_messages (void) const { return m_discard_warning_messages; } |
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100 |
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101 bool discard_warning_messages (bool flag) |
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102 { |
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103 bool val = m_discard_warning_messages; |
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104 m_discard_warning_messages = flag; |
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105 return val; |
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106 } |
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107 |
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108 octave_value beep_on_error (const octave_value_list& args, int nargout); |
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109 |
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110 void set_beep_on_error (bool flag) { m_beep_on_error = flag; } |
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111 |
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112 bool beep_on_error (void) const { return m_beep_on_error; } |
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113 |
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114 bool beep_on_error (bool flag) |
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115 { |
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116 bool val = m_beep_on_error; |
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117 m_beep_on_error = flag; |
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118 return val; |
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119 } |
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120 |
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121 octave_value backtrace_on_warning (const octave_value_list& args, int nargout); |
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122 |
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123 void set_backtrace_on_warning (bool flag) { m_backtrace_on_warning = flag; } |
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124 |
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125 bool backtrace_on_warning (void) const { return m_backtrace_on_warning; } |
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126 |
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127 bool backtrace_on_warning (bool flag) |
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128 { |
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129 bool val = m_backtrace_on_warning; |
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130 m_backtrace_on_warning = flag; |
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131 return val; |
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132 } |
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133 |
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134 octave_value verbose_warning (const octave_value_list& args, int nargout); |
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135 |
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136 void set_verbose_warning (bool flag) { m_verbose_warning = flag; } |
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137 |
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138 bool verbose_warning (void) const { return m_verbose_warning; } |
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139 |
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140 bool verbose_warning (bool flag) |
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141 { |
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142 bool val = m_verbose_warning; |
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143 m_verbose_warning = flag; |
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144 return val; |
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145 } |
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146 |
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147 octave_value quiet_warning (const octave_value_list& args, int nargout); |
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148 |
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149 void set_quiet_warning (bool flag) { m_quiet_warning = flag; } |
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150 |
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151 bool quiet_warning (void) const { return m_quiet_warning; } |
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152 |
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153 bool quiet_warning (bool flag) |
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154 { |
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155 bool val = m_quiet_warning; |
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156 m_quiet_warning = flag; |
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157 return val; |
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158 } |
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159 |
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160 octave_map warning_options (void) const { return m_warning_options; } |
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161 |
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162 void set_warning_options (const octave_map& val) { m_warning_options = val; } |
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163 |
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164 octave_map warning_options (const octave_map& new_val) |
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165 { |
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166 octave_map val = m_warning_options; |
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167 m_warning_options = new_val; |
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168 return val; |
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169 } |
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170 |
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171 octave_value last_error_message (const octave_value_list& args, int nargout); |
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172 |
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173 void set_last_error_message (const std::string& val) { m_last_error_message = val; } |
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174 |
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175 std::string last_error_message (void) const { return m_last_error_message; } |
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176 |
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177 std::string last_error_message (const std::string& s) |
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178 { |
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179 std::string val = m_last_error_message; |
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180 m_last_error_message = s; |
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181 return val; |
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182 } |
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183 |
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184 octave_value last_warning_message (const octave_value_list& args, int nargout); |
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185 |
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186 void set_last_warning_message (const std::string& val) { m_last_warning_message = val; } |
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187 |
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188 std::string last_warning_message (void) const { return m_last_warning_message; } |
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189 |
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190 std::string last_warning_message (const std::string& s) |
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191 { |
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192 std::string val = m_last_warning_message; |
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193 m_last_warning_message = s; |
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194 return val; |
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195 } |
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196 |
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197 octave_value last_warning_id (const octave_value_list& args, int nargout); |
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198 |
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199 void set_last_warning_id (const std::string& val) { m_last_warning_id = val; } |
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200 |
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201 std::string last_warning_id (void) const { return m_last_warning_id; } |
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202 |
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203 std::string last_warning_id (const std::string& s) |
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204 { |
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205 std::string val = m_last_warning_id; |
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206 m_last_warning_id = s; |
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207 return val; |
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208 } |
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209 |
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210 octave_value last_error_id (const octave_value_list& args, int nargout); |
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211 |
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212 void set_last_error_id (const std::string& val) { m_last_error_id = val; } |
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213 |
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214 std::string last_error_id (void) const { return m_last_error_id; } |
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215 |
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216 std::string last_error_id (const std::string& s) |
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217 { |
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218 std::string val = m_last_error_id; |
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219 m_last_error_id = s; |
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220 return val; |
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221 } |
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222 |
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223 void set_last_error_stack (const octave_map& val) |
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224 { |
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225 m_last_error_stack = val; |
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226 } |
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227 |
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228 octave_map last_error_stack (void) const { return m_last_error_stack; } |
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229 |
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230 octave_map last_error_stack (const octave_map& new_val) |
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231 { |
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232 octave_map val = m_last_error_stack; |
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233 m_last_error_stack = new_val; |
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234 return val; |
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235 } |
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236 |
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237 //! For given warning ID, return 0 if warnings are disabled, 1 if |
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238 //! enabled, and 2 if the given ID should be an error instead of a |
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239 //! warning. |
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240 |
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241 int warning_enabled (const std::string& id); |
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242 |
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243 void verror (bool save_last_error, std::ostream& os, const char *name, |
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244 const char *id, const char *fmt, va_list args, |
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245 bool with_cfn = false); |
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246 |
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247 void vwarning (const char *name, const char *id, const char *fmt, |
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248 va_list args); |
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249 |
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250 OCTAVE_NORETURN |
27471 | 251 void error_1 (execution_exception& e, const char *id, const char *fmt, |
252 va_list args); | |
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253 |
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254 OCTAVE_NORETURN |
27471 | 255 void error_1 (const char *id, const char *fmt, va_list args); |
256 | |
257 OCTAVE_NORETURN | |
258 void vusage (const char *id, const char *fmt, va_list args); | |
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259 |
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260 void vwarning (const char *id, const char *fmt, va_list args); |
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261 |
27471 | 262 OCTAVE_NORETURN |
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263 void rethrow_error (const std::string& id, const std::string& msg, |
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264 const octave_map& stack); |
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265 |
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266 OCTAVE_NORETURN |
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267 void vpanic (const char *fmt, va_list args); |
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268 |
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269 OCTAVE_NORETURN |
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270 void panic (const char *fmt, ...); |
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271 |
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272 octave_scalar_map warning_query (const std::string& id_arg); |
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273 |
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274 std::string default_warning_state (void); |
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275 |
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276 void display_warning_options (std::ostream& os); |
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277 |
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278 void set_warning_option (const std::string& state, const std::string& id); |
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279 |
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280 void disable_warning (const std::string& id); |
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281 |
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282 void initialize_default_warning_state (void); |
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283 |
27471 | 284 void interpreter_try (octave::unwind_protect& frame); |
285 | |
286 // Throw execution_exception or, if debug_on_error is TRUE, enter | |
287 // debugger. If stack_info is empty, use current call stack. | |
288 | |
289 OCTAVE_NORETURN | |
290 void throw_error (const std::string& err_type, | |
291 const std::string& id, | |
292 const std::string& message, | |
293 const std::list<frame_info>& stack_info | |
294 = std::list<frame_info> ()); | |
295 | |
296 OCTAVE_NORETURN | |
297 void throw_error (execution_exception& e); | |
298 | |
299 void save_exception (const execution_exception& e); | |
300 | |
301 void display_exception (const execution_exception& e, | |
302 std::ostream& os) const; | |
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303 |
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304 private: |
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305 |
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306 interpreter& m_interpreter; |
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307 |
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308 //! TRUE means that Octave will try to enter the debugger when an error |
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309 //! is encountered. This will also inhibit printing of the normal |
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310 //! traceback message (you will only see the top-level error message). |
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311 |
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312 bool m_debug_on_error; |
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313 |
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314 //! TRUE means that Octave will try to enter the debugger when an error |
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315 //! is encountered within the 'try' section of a 'try' / 'catch' block. |
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316 |
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317 bool m_debug_on_caught; |
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318 |
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319 //! TRUE means that Octave will try to enter the debugger when a warning |
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320 //! is encountered. |
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321 |
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322 bool m_debug_on_warning; |
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323 |
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324 //! TRUE means warning messages are turned off. |
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325 |
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326 bool m_discard_warning_messages; |
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327 |
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328 //! TRUE means that Octave will try to beep obnoxiously before |
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329 //! printing error messages. |
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330 bool m_beep_on_error; |
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331 |
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332 //! TRUE means that Octave will try to display a stack trace when a |
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333 //! warning is encountered. |
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334 bool m_backtrace_on_warning; |
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335 |
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336 //! TRUE means that Octave will print a verbose warning. Currently |
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337 //! unused. |
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338 bool m_verbose_warning; |
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339 |
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340 //! TRUE means that Octave will print no warnings, but lastwarn will |
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341 //! be updated |
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342 bool m_quiet_warning; |
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343 |
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344 //! A structure containing (most of) the current state of warnings. |
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345 octave_map m_warning_options; |
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346 |
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347 //! The text of the last error message. |
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348 std::string m_last_error_message; |
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349 |
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350 //! The text of the last warning message. |
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351 std::string m_last_warning_message; |
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352 |
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353 //! The last warning message id. |
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354 std::string m_last_warning_id; |
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355 |
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356 //! The last error message id. |
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357 std::string m_last_error_id; |
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358 |
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359 //! The last file in which an error occurred. |
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360 octave_map m_last_error_stack; |
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361 }; |
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362 } |
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363 |
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364 // FIXME: should we move the following functions inside the octave |
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365 // namespace? If so, should the functions outside of the namespace be |
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366 // deprecated? Doing that might cause a lot of trouble... If they are |
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367 // not deprecated and eventually removed, does it make sense to also |
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368 // define them inside the octave namespace? |
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369 |
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370 #define panic_impossible() \ |
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371 panic ("impossible state reached in file '%s' at line %d", __FILE__, __LINE__) |
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372 |
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373 extern OCTINTERP_API int warning_enabled (const std::string& id); |
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374 |
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375 extern OCTINTERP_API void |
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376 vmessage (const char *name, const char *fmt, va_list args); |
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377 |
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378 OCTAVE_FORMAT_PRINTF (2, 3) |
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379 extern OCTINTERP_API void message (const char *name, const char *fmt, ...); |
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380 |
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381 extern OCTINTERP_API void vwarning (const char *fmt, va_list args); |
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382 |
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383 OCTAVE_FORMAT_PRINTF (1, 2) |
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384 extern OCTINTERP_API void warning (const char *fmt, ...); |
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385 |
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386 OCTAVE_NORETURN |
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387 extern OCTINTERP_API void verror (const char *fmt, va_list args); |
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388 |
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389 OCTAVE_FORMAT_PRINTF (1, 2) |
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390 OCTAVE_NORETURN |
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391 extern OCTINTERP_API void error (const char *fmt, ...); |
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392 |
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393 OCTAVE_NORETURN |
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394 extern OCTINTERP_API void |
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395 verror (octave::execution_exception&, const char *fmt, va_list args); |
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396 |
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397 OCTAVE_FORMAT_PRINTF (2, 3) |
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398 OCTAVE_NORETURN |
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399 extern OCTINTERP_API void |
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400 error (octave::execution_exception&, const char *fmt, ...); |
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401 |
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402 OCTAVE_NORETURN |
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403 extern OCTINTERP_API void |
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404 verror_with_cfn (const char *fmt, va_list args); |
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405 |
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406 OCTAVE_FORMAT_PRINTF (1, 2) |
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407 OCTAVE_NORETURN |
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408 extern OCTINTERP_API void |
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409 error_with_cfn (const char *fmt, ...); |
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410 |
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411 OCTAVE_NORETURN |
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412 extern OCTINTERP_API void |
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413 vparse_error (const char *fmt, va_list args); |
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414 |
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415 OCTAVE_FORMAT_PRINTF (1, 2) |
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416 OCTAVE_NORETURN |
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417 extern OCTINTERP_API void |
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418 parse_error (const char *fmt, ...); |
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419 |
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420 OCTAVE_NORETURN |
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421 extern OCTINTERP_API void |
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422 vusage_with_id (const char *id, const char *fmt, va_list args); |
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423 |
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424 OCTAVE_FORMAT_PRINTF (2, 3) |
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425 OCTAVE_NORETURN |
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426 extern OCTINTERP_API void |
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427 usage_with_id (const char *id, const char *fmt, ...); |
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428 |
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429 extern OCTINTERP_API void |
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430 vwarning_with_id (const char *id, const char *fmt, va_list args); |
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431 |
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432 OCTAVE_FORMAT_PRINTF (2, 3) |
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433 extern OCTINTERP_API void |
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434 warning_with_id (const char *id, const char *fmt, ...); |
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435 |
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436 OCTAVE_NORETURN |
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437 extern OCTINTERP_API void |
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438 verror_with_id (const char *id, const char *fmt, va_list args); |
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439 |
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440 OCTAVE_FORMAT_PRINTF (2, 3) |
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441 OCTAVE_NORETURN |
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442 extern OCTINTERP_API void |
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443 error_with_id (const char *id, const char *fmt, ...); |
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444 |
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445 OCTAVE_NORETURN |
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446 extern OCTINTERP_API void |
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447 verror_with_id_cfn (const char *id, const char *fmt, va_list args); |
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448 |
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449 OCTAVE_FORMAT_PRINTF (2, 3) |
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450 OCTAVE_NORETURN |
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451 extern OCTINTERP_API void |
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452 error_with_id_cfn (const char *id, const char *fmt, ...); |
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453 |
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454 OCTAVE_NORETURN |
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455 extern OCTINTERP_API void |
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456 vparse_error_with_id (const char *id, const char *fmt, va_list args); |
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457 |
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458 OCTAVE_FORMAT_PRINTF (2, 3) |
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459 OCTAVE_NORETURN |
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460 extern OCTINTERP_API void |
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461 parse_error_with_id (const char *id, const char *fmt, ...); |
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462 |
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463 OCTAVE_NORETURN |
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464 extern OCTINTERP_API void vpanic (const char *fmt, va_list args); |
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465 |
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466 OCTAVE_FORMAT_PRINTF (1, 2) |
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467 OCTAVE_NORETURN |
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468 extern OCTINTERP_API void panic (const char *fmt, ...); |
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469 |
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470 //! Helper function for print_usage defined in defun.cc. |
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471 |
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472 extern OCTINTERP_API void defun_usage_message (const std::string& msg); |
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473 |
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474 extern OCTINTERP_API octave_value_list |
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475 set_warning_state (const std::string& id, const std::string& state); |
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476 |
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477 extern OCTINTERP_API octave_value_list |
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478 set_warning_state (const octave_value_list& args); |
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479 |
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480 extern OCTINTERP_API void disable_warning (const std::string& id); |
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481 |
27471 | 482 extern OCTINTERP_API void interpreter_try (octave::unwind_protect&); |
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483 |
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484 OCTAVE_DEPRECATED (6, "this variable is obsolete and always has the value 0") |
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485 extern OCTINTERP_API int error_state; |
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486 |
27471 | 487 OCTAVE_DEPRECATED (6, "this function is obsolete and should not be needed") |
488 inline void reset_error_handler (void) { } | |
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489 |
1 | 490 #endif |