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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . T R A C E B A C K --
-- --
-- B o d y --
-- --
-- Copyright (C) 1999-2014, AdaCore --
-- --
-- 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 version uses System.Machine_State_Operations routines
with System.Machine_State_Operations;
package body System.Traceback is
use System.Machine_State_Operations;
-- 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);
-- -- Same as the exported version, but takes Traceback as an Address
-- ???See declaration in the spec for why this is temporarily commented out.
----------------
-- 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);
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);
end loop;
Free_Machine_State (M);
end Call_Chain;
procedure Call_Chain
(Traceback : in out System.Traceback_Entries.Tracebacks_Array;
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
Call_Chain
(Traceback'Address, Max_Len, Len,
Exclude_Min, Exclude_Max,
-- Skip one extra frame to skip the other Call_Chain entry as well
Skip_Frames => Skip_Frames + 1);
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;
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