+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- 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 --
--- --
--- $Revision: 1.1 $
--- --
--- Copyright (C) 2000-2001 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
-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 : in 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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