6cbcc54138
* xeinfo.adb: Don't look for revision numbers. * xnmake.adb: Likewise. * xsinfo.adb: Likewise. * xsnames.adb: Likewise. * xtreeprs.adb: Likewise. From-SVN: r50768
128 lines
5.5 KiB
Ada
128 lines
5.5 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- G N A T . E X C E P T I O N _ T R A C E S --
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-- --
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-- B o d y --
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-- --
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-- --
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-- Copyright (C) 2000-2001 Ada Core Technologies, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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with System.Standard_Library; use System.Standard_Library;
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with System.Soft_Links; use System.Soft_Links;
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package body GNAT.Exception_Traces is
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-- Calling the decorator directly from where it is needed would require
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-- introducing nasty dependencies upon the spec of this package (typically
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-- in a-except.adb). We also have to deal with the fact that the traceback
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-- array within an exception occurrence and the one the decorator shall
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-- accept are of different types. These are two reasons for which a wrapper
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-- with a System.Address argument is indeed used to call the decorator
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-- provided by the user of this package. This wrapper is called via a
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-- soft-link, which either is null when no decorator is in place or "points
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-- to" the following function otherwise.
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function Decorator_Wrapper
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(Traceback : System.Address;
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Len : Natural)
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return String;
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-- The wrapper to be called when a decorator is in place for exception
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-- backtraces.
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--
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-- Traceback is the address of the call chain array as stored in the
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-- exception occurrence and Len is the number of significant addresses
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-- contained in this array.
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Current_Decorator : Traceback_Decorator := null;
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-- The decorator to be called by the wrapper when it is not null, as set
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-- by Set_Trace_Decorator. When this access is null, the wrapper is null
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-- also and shall then not be called.
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-----------------------
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-- Decorator_Wrapper --
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-----------------------
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function Decorator_Wrapper
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(Traceback : System.Address;
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Len : Natural)
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return String
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is
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Decorator_Traceback : Tracebacks_Array (1 .. Len);
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for Decorator_Traceback'Address use Traceback;
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-- Handle the "transition" from the array stored in the exception
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-- occurrence to the array expected by the decorator.
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pragma Import (Ada, Decorator_Traceback);
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begin
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return Current_Decorator.all (Decorator_Traceback);
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end Decorator_Wrapper;
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-------------------------
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-- Set_Trace_Decorator --
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-------------------------
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procedure Set_Trace_Decorator (Decorator : Traceback_Decorator) is
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begin
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Current_Decorator := Decorator;
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if Current_Decorator /= null then
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Traceback_Decorator_Wrapper := Decorator_Wrapper'Access;
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else
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Traceback_Decorator_Wrapper := null;
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end if;
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end Set_Trace_Decorator;
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-- Trace_On/Trace_Off control the kind of automatic output to occur
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-- by way of the global Exception_Trace variable.
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---------------
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-- Trace_Off --
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---------------
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procedure Trace_Off is
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begin
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Exception_Trace := RM_Convention;
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end Trace_Off;
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--------------
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-- Trace_On --
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--------------
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procedure Trace_On (Kind : in Trace_Kind) is
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begin
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case Kind is
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when Every_Raise =>
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Exception_Trace := Every_Raise;
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when Unhandled_Raise =>
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Exception_Trace := Unhandled_Raise;
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end case;
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end Trace_On;
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end GNAT.Exception_Traces;
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