1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . T R A C E B A C K --
9 -- Copyright (C) 1999-2003 Ada Core Technologies, Inc. --
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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This version assumes that System.Machine_State_Operations.Pop_Frame can
35 -- work with the Info parameter being null.
37 with System.Machine_State_Operations;
39 package body System.Traceback is
41 use System.Machine_State_Operations;
48 (Traceback : System.Address;
51 Exclude_Min : System.Address := System.Null_Address;
52 Exclude_Max : System.Address := System.Null_Address;
53 Skip_Frames : Natural := 1)
55 type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
56 pragma Suppress_Initialization (Tracebacks_Array);
61 Trace : Tracebacks_Array;
62 for Trace'Address use Traceback;
64 N_Skips : Natural := 0;
67 M := Allocate_Machine_State;
68 Set_Machine_State (M);
70 -- Skip the requested number of frames
73 Code := Get_Code_Loc (M);
74 exit when Code = Null_Address or else N_Skips = Skip_Frames;
76 Pop_Frame (M, System.Null_Address);
77 N_Skips := N_Skips + 1;
80 -- Now, record the frames outside the exclusion bounds, updating
81 -- the Len output value along the way.
85 Code := Get_Code_Loc (M);
86 exit when Code = Null_Address or else Len = Max_Len;
88 if Code < Exclude_Min or else Code > Exclude_Max then
93 Pop_Frame (M, System.Null_Address);
96 Free_Machine_State (M);
103 function C_Call_Chain
104 (Traceback : System.Address;
105 Max_Len : Natural) return Natural
109 Call_Chain (Traceback, Max_Len, Val);
113 end System.Traceback;