------------------------------------------------------------------------------ -- -- -- 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) 2000-2002 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 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;