File : a-exexpr.adb
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 -- --
19 -- --
20 -- --
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
35 with Ada.Unchecked_Conversion;
36
37 separate (Ada.Exceptions)
38 package 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
99 end Exception_Propagation;