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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . E X C E P T I O N _ T R A C E S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2000-2005, 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 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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. --
-- --
------------------------------------------------------------------------------
with System.Standard_Library; use System.Standard_Library;
with System.Soft_Links; use System.Soft_Links;
package body GNAT.Exception_Traces is
-- Calling the decorator directly from where it is needed would require
-- introducing nasty dependencies upon the spec of this package (typically
-- in a-except.adb). We also have to deal with the fact that the traceback
-- array within an exception occurrence and the one the decorator shall
-- accept are of different types. These are two reasons for which a wrapper
-- with a System.Address argument is indeed used to call the decorator
-- provided by the user of this package. This wrapper is called via a
-- soft-link, which either is null when no decorator is in place or "points
-- to" the following function otherwise.
function Decorator_Wrapper
(Traceback : System.Address;
Len : Natural) return String;
-- The wrapper to be called when a decorator is in place for exception
-- backtraces.
--
-- Traceback is the address of the call chain array as stored in the
-- exception occurrence and Len is the number of significant addresses
-- contained in this array.
Current_Decorator : Traceback_Decorator := null;
-- The decorator to be called by the wrapper when it is not null, as set
-- by Set_Trace_Decorator. When this access is null, the wrapper is null
-- also and shall then not be called.
-----------------------
-- Decorator_Wrapper --
-----------------------
function Decorator_Wrapper
(Traceback : System.Address;
Len : Natural) return String
is
Decorator_Traceback : Tracebacks_Array (1 .. Len);
for Decorator_Traceback'Address use Traceback;
-- Handle the "transition" from the array stored in the exception
-- occurrence to the array expected by the decorator.
pragma Import (Ada, Decorator_Traceback);
begin
return Current_Decorator.all (Decorator_Traceback);
end Decorator_Wrapper;
-------------------------
-- Set_Trace_Decorator --
-------------------------
procedure Set_Trace_Decorator (Decorator : Traceback_Decorator) is
begin
Current_Decorator := Decorator;
if Current_Decorator /= null then
Traceback_Decorator_Wrapper := Decorator_Wrapper'Access;
else
Traceback_Decorator_Wrapper := null;
end if;
end Set_Trace_Decorator;
-- Trace_On/Trace_Off control the kind of automatic output to occur
-- by way of the global Exception_Trace variable.
---------------
-- Trace_Off --
---------------
procedure Trace_Off is
begin
Exception_Trace := RM_Convention;
end Trace_Off;
--------------
-- Trace_On --
--------------
procedure Trace_On (Kind : Trace_Kind) is
begin
case Kind is
when Every_Raise =>
Exception_Trace := Every_Raise;
when Unhandled_Raise =>
Exception_Trace := Unhandled_Raise;
end case;
end Trace_On;
end GNAT.Exception_Traces;
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