OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [a-exextr.adb] - Blame information for rev 717

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                         GNAT COMPILER COMPONENTS                         --
4
--                                                                          --
5
--                      ADA.EXCEPTIONS.EXCEPTION_TRACES                     --
6
--                                                                          --
7
--                                 B o d y                                  --
8
--                                                                          --
9
--          Copyright (C) 1992-2011, Free Software Foundation, Inc.         --
10
--                                                                          --
11
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12
-- terms of the  GNU General Public License as published  by the Free Soft- --
13
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16
-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17
--                                                                          --
18
-- As a special exception under Section 7 of GPL version 3, you are granted --
19
-- additional permissions described in the GCC Runtime Library Exception,   --
20
-- version 3.1, as published by the Free Software Foundation.               --
21
--                                                                          --
22
-- You should have received a copy of the GNU General Public License and    --
23
-- a copy of the GCC Runtime Library Exception along with this program;     --
24
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25
-- <http://www.gnu.org/licenses/>.                                          --
26
--                                                                          --
27
-- GNAT was originally developed  by the GNAT team at  New York University. --
28
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29
--                                                                          --
30
------------------------------------------------------------------------------
31
 
32
with Ada.Unchecked_Conversion;
33
 
34
pragma Warnings (Off);
35
with Ada.Exceptions.Last_Chance_Handler;
36
pragma Warnings (On);
37
--  Bring last chance handler into closure
38
 
39
separate (Ada.Exceptions)
40
package body Exception_Traces is
41
 
42
   Nline : constant String := String'(1 => ASCII.LF);
43
   --  Convenient shortcut
44
 
45
   type Exception_Action is access procedure (E : Exception_Occurrence);
46
   Global_Action : Exception_Action := null;
47
   pragma Export
48
     (Ada, Global_Action, "__gnat_exception_actions_global_action");
49
   --  Global action, executed whenever an exception is raised.  Changing the
50
   --  export name must be coordinated with code in g-excact.adb.
51
 
52
   Raise_Hook_Initialized : Boolean := False;
53
   pragma Export
54
     (Ada, Raise_Hook_Initialized, "__gnat_exception_actions_initialized");
55
 
56
   procedure Last_Chance_Handler (Except : Exception_Occurrence);
57
   pragma Import (C, Last_Chance_Handler, "__gnat_last_chance_handler");
58
   pragma No_Return (Last_Chance_Handler);
59
   --  Users can replace the default version of this routine,
60
   --  Ada.Exceptions.Last_Chance_Handler.
61
 
62
   function To_Action is new Ada.Unchecked_Conversion
63
     (Raise_Action, Exception_Action);
64
 
65
   -----------------------
66
   -- Local Subprograms --
67
   -----------------------
68
 
69
   procedure Notify_Exception (Excep : EOA; Is_Unhandled : Boolean);
70
   --  Factorizes the common processing for Notify_Handled_Exception and
71
   --  Notify_Unhandled_Exception. Is_Unhandled is set to True only in the
72
   --  latter case because Notify_Handled_Exception may be called for an
73
   --  actually unhandled occurrence in the Front-End-SJLJ case.
74
 
75
   --------------------------------
76
   -- Import Run-Time C Routines --
77
   --------------------------------
78
 
79
   --  The purpose of the following pragma Import is to ensure that we
80
   --  generate appropriate subprogram descriptors for all C routines in
81
   --  the standard GNAT library that can raise exceptions. This ensures
82
   --  that the exception propagation can properly find these routines
83
 
84
   pragma Propagate_Exceptions;
85
 
86
   ----------------------
87
   -- Notify_Exception --
88
   ----------------------
89
 
90
   procedure Notify_Exception (Excep : EOA; Is_Unhandled : Boolean) is
91
   begin
92
      --  Output the exception information required by the Exception_Trace
93
      --  configuration. Take care not to output information about internal
94
      --  exceptions.
95
 
96
      if not Excep.Id.Not_Handled_By_Others
97
        and then
98
          (Exception_Trace = Every_Raise
99
            or else (Exception_Trace = Unhandled_Raise and then Is_Unhandled))
100
      then
101
         --  Exception trace messages need to be protected when several tasks
102
         --  can issue them at the same time.
103
 
104
         Lock_Task.all;
105
         To_Stderr (Nline);
106
 
107
         if Is_Unhandled then
108
            To_Stderr ("Unhandled ");
109
         end if;
110
 
111
         To_Stderr ("Exception raised");
112
         To_Stderr (Nline);
113
         To_Stderr (Tailored_Exception_Information (Excep.all));
114
         Unlock_Task.all;
115
      end if;
116
 
117
      --  Call the user-specific actions
118
      --  ??? We should presumably look at the reraise status here.
119
 
120
      if Raise_Hook_Initialized
121
        and then Exception_Data_Ptr (Excep.Id).Raise_Hook /= null
122
      then
123
         To_Action (Exception_Data_Ptr (Excep.Id).Raise_Hook) (Excep.all);
124
      end if;
125
 
126
      if Global_Action /= null then
127
         Global_Action (Excep.all);
128
      end if;
129
   end Notify_Exception;
130
 
131
   ------------------------------
132
   -- Notify_Handled_Exception --
133
   ------------------------------
134
 
135
   procedure Notify_Handled_Exception is
136
   begin
137
      Notify_Exception (Get_Current_Excep.all, Is_Unhandled => False);
138
   end Notify_Handled_Exception;
139
 
140
   --------------------------------
141
   -- Notify_Unhandled_Exception --
142
   --------------------------------
143
 
144
   procedure Notify_Unhandled_Exception is
145
      Excep : constant EOA := Get_Current_Excep.all;
146
 
147
   begin
148
      --  Check whether there is any termination handler to be executed for
149
      --  the environment task, and execute it if needed. Here we handle both
150
      --  the Abnormal and Unhandled_Exception task termination. Normal
151
      --  task termination routine is executed elsewhere (either in the
152
      --  Task_Wrapper or in the Adafinal routine for the environment task).
153
 
154
      Task_Termination_Handler.all (Excep.all);
155
 
156
      Notify_Exception (Excep, Is_Unhandled => True);
157
      Debug_Unhandled_Exception (SSL.Exception_Data_Ptr (Excep.Id));
158
   end Notify_Unhandled_Exception;
159
 
160
   -----------------------------------
161
   -- Unhandled_Exception_Terminate --
162
   -----------------------------------
163
 
164
   procedure Unhandled_Exception_Terminate is
165
      Excep : constant EOA := Save_Occurrence (Get_Current_Excep.all.all);
166
      --  This occurrence will be used to display a message after finalization.
167
      --  It is necessary to save a copy here, or else the designated value
168
      --  could be overwritten if an exception is raised during finalization
169
      --  (even if that exception is caught).
170
 
171
   begin
172
      Last_Chance_Handler (Excep.all);
173
   end Unhandled_Exception_Terminate;
174
 
175
   ------------------------------------
176
   -- Handling GNAT.Exception_Traces --
177
   ------------------------------------
178
 
179
   --  The bulk of exception traces output is centralized in Notify_Exception,
180
   --  for both the Handled and Unhandled cases. Extra task specific output is
181
   --  triggered in the task wrapper for unhandled occurrences in tasks. It is
182
   --  not performed in this unit to avoid dragging dependencies against the
183
   --  tasking units here.
184
 
185
   --  We used to rely on the output performed by Unhanded_Exception_Terminate
186
   --  for the case of an unhandled occurrence in the environment thread, and
187
   --  the task wrapper was responsible for the whole output in the tasking
188
   --  case.
189
 
190
   --  This initial scheme had a drawback: the output from Terminate only
191
   --  occurs after finalization is done, which means possibly never if some
192
   --  tasks keep hanging around.
193
 
194
   --  The first "presumably obvious" fix consists in moving the Terminate
195
   --  output before the finalization. It has not been retained because it
196
   --  introduces annoying changes in output orders when the finalization
197
   --  itself issues outputs, this also in "regular" cases not resorting to
198
   --  Exception_Traces.
199
 
200
   --  Today's solution has the advantage of simplicity and better isolates
201
   --  the Exception_Traces machinery.
202
 
203
   --  It currently outputs the information about unhandled exceptions twice
204
   --  in the environment thread, once in the notification routine and once in
205
   --  the termination routine. Avoiding the second output is possible but so
206
   --  far has been considered undesirable. It would mean changing the order
207
   --  of outputs between the two runs with or without exception traces, while
208
   --  it seems preferable to only have additional outputs in the former
209
   --  case.
210
 
211
end Exception_Traces;

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.