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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- A D A . E X C E P T I O N S . L A S T _ C H A N C E _ H A N D L E R --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 2003-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- Default version for most targets
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33
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34 pragma Compiler_Unit_Warning;
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35
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36 with System.Standard_Library; use System.Standard_Library;
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37 with System.Soft_Links;
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38
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39 procedure Ada.Exceptions.Last_Chance_Handler
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40 (Except : Exception_Occurrence)
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41 is
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42 procedure Unhandled_Terminate;
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43 pragma No_Return (Unhandled_Terminate);
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44 pragma Import (C, Unhandled_Terminate, "__gnat_unhandled_terminate");
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45 -- Perform system dependent shutdown code
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46
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47 function Exception_Message_Length
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48 (X : Exception_Occurrence) return Natural;
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49 pragma Import (Ada, Exception_Message_Length, "__gnat_exception_msg_len");
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50
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51 procedure Append_Info_Exception_Message
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52 (X : Exception_Occurrence;
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53 Info : in out String;
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54 Ptr : in out Natural);
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55 pragma Import
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56 (Ada, Append_Info_Exception_Message, "__gnat_append_info_e_msg");
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57
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58 procedure Append_Info_Untailored_Exception_Information
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59 (X : Exception_Occurrence;
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60 Info : in out String;
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61 Ptr : in out Natural);
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62 pragma Import
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63 (Ada, Append_Info_Untailored_Exception_Information,
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64 "__gnat_append_info_u_e_info");
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65
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66 procedure To_Stderr (S : String);
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67 pragma Import (Ada, To_Stderr, "__gnat_to_stderr");
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68 -- Little routine to output string to stderr
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69
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70 Ptr : Natural := 0;
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71 Nobuf : String (1 .. 0);
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72
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73 Nline : constant String := String'(1 => ASCII.LF);
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74 -- Convenient shortcut
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75
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76 begin
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77 -- Do not execute any task termination code when shutting down the system.
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78 -- The Adafinal procedure would execute the task termination routine for
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79 -- normal termination, but we have already executed the task termination
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80 -- procedure because of an unhandled exception.
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81
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82 System.Soft_Links.Task_Termination_Handler :=
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83 System.Soft_Links.Task_Termination_NT'Access;
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84
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85 -- We shutdown the runtime now. The rest of the procedure needs to be
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86 -- careful not to use anything that would require runtime support. In
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87 -- particular, functions returning strings are banned since the sec stack
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88 -- is no longer functional. This is particularly important to note for the
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89 -- Exception_Information output. We used to allow the tailored version to
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90 -- show up here, which turned out to be a bad idea as it might involve a
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91 -- traceback decorator the length of which we don't control. Potentially
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92 -- heavy primary/secondary stack use or dynamic allocations right before
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93 -- this point are not welcome, moving the output before the finalization
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94 -- raises order of outputs concerns, and decorators are intended to only
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95 -- be used with exception traces, which should have been issued already.
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96
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97 System.Standard_Library.Adafinal;
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98
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99 -- Print a message only when exception traces are not active
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100
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101 if Exception_Trace /= RM_Convention then
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102 null;
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103
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104 -- Check for special case of raising _ABORT_SIGNAL, which is not
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105 -- really an exception at all. We recognize this by the fact that
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106 -- it is the only exception whose name starts with underscore.
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107
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108 elsif To_Ptr (Except.Id.Full_Name) (1) = '_' then
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109 To_Stderr (Nline);
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110 To_Stderr ("Execution terminated by abort of environment task");
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111 To_Stderr (Nline);
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112
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113 -- If no tracebacks, we print the unhandled exception in the old style
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114 -- (i.e. the style used before ZCX was implemented). We do this to
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115 -- retain compatibility.
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116
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117 elsif Except.Num_Tracebacks = 0 then
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118 To_Stderr (Nline);
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119 To_Stderr ("raised ");
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120 To_Stderr
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121 (To_Ptr (Except.Id.Full_Name) (1 .. Except.Id.Name_Length - 1));
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122
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123 if Exception_Message_Length (Except) /= 0 then
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124 To_Stderr (" : ");
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125 Append_Info_Exception_Message (Except, Nobuf, Ptr);
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126 end if;
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127
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128 To_Stderr (Nline);
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129
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130 -- Traceback exists
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131
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132 else
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133 To_Stderr (Nline);
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134 To_Stderr ("Execution terminated by unhandled exception");
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135 To_Stderr (Nline);
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136
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137 Append_Info_Untailored_Exception_Information (Except, Nobuf, Ptr);
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138 end if;
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139
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140 Unhandled_Terminate;
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141 end Ada.Exceptions.Last_Chance_Handler;
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