1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--  A D A . E X C E P T I O N S . E X C E P T I O N _ P R O P A G A T I O N --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2012, 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--  This is the default version, using the __builtin_setjmp/longjmp EH
33--  mechanism.
34
35with Ada.Unchecked_Conversion;
36
37separate (Ada.Exceptions)
38package body Exception_Propagation is
39
40   --  Common binding to __builtin_longjmp for sjlj variants.
41
42   procedure builtin_longjmp (buffer : System.Address; Flag : Integer);
43   pragma No_Return (builtin_longjmp);
44   pragma Import (Intrinsic, builtin_longjmp, "__builtin_longjmp");
45
46   procedure Propagate_Continue (E : Exception_Id);
47   pragma No_Return (Propagate_Continue);
48   pragma Export (C, Propagate_Continue, "__gnat_raise_nodefer_with_msg");
49   --  A call to this procedure is inserted automatically by GIGI, in order
50   --  to continue the propagation when the exception was not handled.
51   --  The linkage name is historical.
52
53   -------------------------
54   -- Allocate_Occurrence --
55   -------------------------
56
57   function Allocate_Occurrence return EOA is
58   begin
59      return Get_Current_Excep.all;
60   end Allocate_Occurrence;
61
62   -------------------------
63   -- Propagate_Exception --
64   -------------------------
65
66   procedure Propagate_Exception (Excep : EOA) is
67      Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
68
69   begin
70      --  If the jump buffer pointer is non-null, transfer control using
71      --  it. Otherwise announce an unhandled exception (note that this
72      --  means that we have no finalizations to do other than at the outer
73      --  level). Perform the necessary notification tasks in both cases.
74
75      if Jumpbuf_Ptr /= Null_Address then
76         if not Excep.Exception_Raised then
77            Excep.Exception_Raised := True;
78            Exception_Traces.Notify_Handled_Exception (Excep);
79         end if;
80
81         builtin_longjmp (Jumpbuf_Ptr, 1);
82
83      else
84         Exception_Traces.Notify_Unhandled_Exception (Excep);
85         Exception_Traces.Unhandled_Exception_Terminate (Excep);
86      end if;
87   end Propagate_Exception;
88
89   ------------------------
90   -- Propagate_Continue --
91   ------------------------
92
93   procedure Propagate_Continue (E : Exception_Id) is
94      pragma Unreferenced (E);
95   begin
96      Propagate_Exception (Get_Current_Excep.all);
97   end Propagate_Continue;
98
99end Exception_Propagation;
100