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fbf5a39b AC |
1 | ------------------------------------------------------------------------------ |
2 | -- -- | |
3 | -- GNAT COMPILER COMPONENTS -- | |
4 | -- -- | |
9f4fd324 | 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 -- |
fbf5a39b AC |
6 | -- -- |
7 | -- B o d y -- | |
8 | -- -- | |
748086b7 | 9 | -- Copyright (C) 1992-2009, Free Software Foundation, Inc. -- |
fbf5a39b AC |
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- -- | |
748086b7 | 13 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
fbf5a39b AC |
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 -- | |
748086b7 JJ |
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/>. -- | |
fbf5a39b AC |
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 | ||
982f26e4 AC |
32 | -- This is the default version, using the __builtin_setjmp/longjmp EH |
33 | -- mechanism. | |
fbf5a39b | 34 | |
5453d5bd AC |
35 | with System.Storage_Elements; use System.Storage_Elements; |
36 | ||
fbf5a39b AC |
37 | pragma Warnings (Off); |
38 | -- Since several constructs give warnings in 3.14a1, including unreferenced | |
39 | -- variables and pragma Unreferenced itself. | |
40 | ||
41 | separate (Ada.Exceptions) | |
42 | package body Exception_Propagation is | |
43 | ||
982f26e4 AC |
44 | procedure builtin_longjmp (buffer : Address; Flag : Integer); |
45 | pragma No_Return (builtin_longjmp); | |
46 | pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp"); | |
5453d5bd | 47 | |
fbf5a39b AC |
48 | --------------------- |
49 | -- Setup_Exception -- | |
50 | --------------------- | |
51 | ||
fbf5a39b AC |
52 | procedure Setup_Exception |
53 | (Excep : EOA; | |
54 | Current : EOA; | |
55 | Reraised : Boolean := False) | |
56 | is | |
982f26e4 | 57 | pragma Unreferenced (Excep, Current, Reraised); |
fbf5a39b | 58 | begin |
8fc789c8 | 59 | -- In the GNAT-SJLJ case this "stack" only exists implicitly, by way of |
982f26e4 AC |
60 | -- local occurrence declarations together with save/restore operations |
61 | -- generated by the front-end, and this routine has nothing to do. | |
0da2c8ac | 62 | |
fbf5a39b | 63 | null; |
982f26e4 | 64 | end Setup_Exception; |
fbf5a39b AC |
65 | |
66 | ------------------------- | |
67 | -- Propagate_Exception -- | |
68 | ------------------------- | |
69 | ||
6f301919 AC |
70 | procedure Propagate_Exception |
71 | (E : Exception_Id; | |
72 | From_Signal_Handler : Boolean) | |
73 | is | |
74 | pragma Inspection_Point (E); | |
75 | ||
982f26e4 AC |
76 | Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all; |
77 | Excep : constant EOA := Get_Current_Excep.all; | |
fbf5a39b | 78 | begin |
982f26e4 AC |
79 | -- Compute the backtrace for this occurrence if corresponding binder |
80 | -- option has been set. Call_Chain takes care of the reraise case. | |
fbf5a39b | 81 | |
982f26e4 | 82 | Call_Chain (Excep); |
fbf5a39b | 83 | |
982f26e4 | 84 | -- Note on above call to Call_Chain: |
fbf5a39b | 85 | |
982f26e4 AC |
86 | -- We used to only do this if From_Signal_Handler was not set, |
87 | -- based on the assumption that backtracing from a signal handler | |
88 | -- would not work due to stack layout oddities. However, since | |
fbf5a39b | 89 | |
982f26e4 AC |
90 | -- 1. The flag is never set in tasking programs (Notify_Exception |
91 | -- performs regular raise statements), and | |
fbf5a39b | 92 | |
982f26e4 AC |
93 | -- 2. No problem has shown up in tasking programs around here so |
94 | -- far, this turned out to be too strong an assumption. | |
fbf5a39b | 95 | |
982f26e4 | 96 | -- As, in addition, the test was |
fbf5a39b | 97 | |
982f26e4 AC |
98 | -- 1. preventing the production of backtraces in non-tasking |
99 | -- programs, and | |
fbf5a39b | 100 | |
982f26e4 AC |
101 | -- 2. introducing a behavior inconsistency between |
102 | -- the tasking and non-tasking cases, | |
fbf5a39b | 103 | |
982f26e4 | 104 | -- we have simply removed it |
fbf5a39b | 105 | |
982f26e4 AC |
106 | -- If the jump buffer pointer is non-null, transfer control using |
107 | -- it. Otherwise announce an unhandled exception (note that this | |
108 | -- means that we have no finalizations to do other than at the outer | |
109 | -- level). Perform the necessary notification tasks in both cases. | |
fbf5a39b | 110 | |
982f26e4 AC |
111 | if Jumpbuf_Ptr /= Null_Address then |
112 | if not Excep.Exception_Raised then | |
113 | Excep.Exception_Raised := True; | |
114 | Exception_Traces.Notify_Handled_Exception; | |
115 | end if; | |
fbf5a39b | 116 | |
982f26e4 | 117 | builtin_longjmp (Jumpbuf_Ptr, 1); |
fbf5a39b | 118 | |
982f26e4 AC |
119 | else |
120 | Exception_Traces.Notify_Unhandled_Exception; | |
121 | Exception_Traces.Unhandled_Exception_Terminate; | |
fbf5a39b | 122 | end if; |
fbf5a39b AC |
123 | end Propagate_Exception; |
124 | ||
fbf5a39b | 125 | end Exception_Propagation; |