1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . T R A C E B A C K --
-- --
-- B o d y --
-- --
-- Copyright (C) 1999-2009, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This is the default version of this package
-- Note: this unit must be compiled using -fno-optimize-sibling-calls.
-- See comment below in body of Call_Chain for details on the reason.
pragma Compiler_Unit;
package body System.Traceback is
------------------
-- C_Call_Chain --
------------------
function C_Call_Chain
(Traceback : System.Address;
Max_Len : Natural)
return Natural
is
Val : Natural;
begin
Call_Chain (Traceback, Max_Len, Val);
return Val;
end C_Call_Chain;
----------------
-- Call_Chain --
----------------
function Backtrace
(Traceback : System.Address;
Len : Integer;
Exclude_Min : System.Address;
Exclude_Max : System.Address;
Skip_Frames : Integer)
return Integer;
pragma Import (C, Backtrace, "__gnat_backtrace");
procedure Call_Chain
(Traceback : System.Address;
Max_Len : Natural;
Len : out Natural;
Exclude_Min : System.Address := System.Null_Address;
Exclude_Max : System.Address := System.Null_Address;
Skip_Frames : Natural := 1)
is
begin
-- Note: Backtrace relies on the following call actually creating a
-- stack frame. To ensure that this is the case, it is essential to
-- compile this unit without sibling call optimization.
-- We want the underlying engine to skip its own frame plus the
-- ones we have been requested to skip ourselves.
Len := Backtrace (Traceback => Traceback,
Len => Max_Len,
Exclude_Min => Exclude_Min,
Exclude_Max => Exclude_Max,
Skip_Frames => Skip_Frames + 1);
end Call_Chain;
end System.Traceback;
|
