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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;