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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . T R A C E B A C K --
-- --
-- B o d y --
-- --
-- Copyright (C) 1999-2003 Ada Core Technologies, 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This version assumes that System.Machine_State_Operations.Pop_Frame can
-- work with the Info parameter being null.
with System.Machine_State_Operations;
package body System.Traceback is
use System.Machine_State_Operations;
----------------
-- Call_Chain --
----------------
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
type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
pragma Suppress_Initialization (Tracebacks_Array);
M : Machine_State;
Code : Code_Loc;
Trace : Tracebacks_Array;
for Trace'Address use Traceback;
N_Skips : Natural := 0;
begin
M := Allocate_Machine_State;
Set_Machine_State (M);
-- Skip the requested number of frames
loop
Code := Get_Code_Loc (M);
exit when Code = Null_Address or else N_Skips = Skip_Frames;
Pop_Frame (M, System.Null_Address);
N_Skips := N_Skips + 1;
end loop;
-- Now, record the frames outside the exclusion bounds, updating
-- the Len output value along the way.
Len := 0;
loop
Code := Get_Code_Loc (M);
exit when Code = Null_Address or else Len = Max_Len;
if Code < Exclude_Min or else Code > Exclude_Max then
Len := Len + 1;
Trace (Len) := Code;
end if;
Pop_Frame (M, System.Null_Address);
end loop;
Free_Machine_State (M);
end Call_Chain;
------------------
-- 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;
end System.Traceback;
|
