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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . E X C E P T I O N _ T R A C E S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2000-2023, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Ada.Unchecked_Conversion;
with System.Standard_Library; use System.Standard_Library;
with System.Soft_Links; use System.Soft_Links;
package body System.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 accepts
-- 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
subtype Trace_Array is Traceback_Entries.Tracebacks_Array (1 .. Len);
type Trace_Array_Access is access all Trace_Array;
function To_Trace_Array is new
Ada.Unchecked_Conversion (Address, Trace_Array_Access);
Decorator_Traceback : constant Trace_Array_Access :=
To_Trace_Array (Traceback);
begin
return Current_Decorator.all (Decorator_Traceback.all);
end Decorator_Wrapper;
-------------------------
-- Set_Trace_Decorator --
-------------------------
procedure Set_Trace_Decorator (Decorator : Traceback_Decorator) is
begin
Current_Decorator := Decorator;
Traceback_Decorator_Wrapper :=
(if Current_Decorator /= null
then Decorator_Wrapper'Access else null);
end Set_Trace_Decorator;
---------------
-- 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;
when Unhandled_Raise_In_Main =>
Exception_Trace := Unhandled_Raise_In_Main;
end case;
end Trace_On;
end System.Exception_Traces;
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