123 lines
5.3 KiB
Ada
123 lines
5.3 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . 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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-- Copyright (C) 2000-2015, AdaCore --
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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 3, 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. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Ada.Unchecked_Conversion;
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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 System.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 accepts
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-- are of different types. These are two reasons for which a wrapper with
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-- a System.Address argument is indeed used to call the decorator provided
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-- by the user of this package. This wrapper is called via a soft-link,
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-- which either is null when no decorator is in place or "points to" the
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-- following function otherwise.
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function Decorator_Wrapper
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(Traceback : System.Address;
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Len : Natural) 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) return String
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is
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subtype Trace_Array is Traceback_Entries.Tracebacks_Array (1 .. Len);
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type Trace_Array_Access is access all Trace_Array;
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function To_Trace_Array is new
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Ada.Unchecked_Conversion (Address, Trace_Array_Access);
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Decorator_Traceback : constant Trace_Array_Access :=
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To_Trace_Array (Traceback);
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begin
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return Current_Decorator.all (Decorator_Traceback.all);
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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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Traceback_Decorator_Wrapper :=
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(if Current_Decorator /= null
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then Decorator_Wrapper'Access else null);
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end Set_Trace_Decorator;
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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 : 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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when Unhandled_Raise_In_Main =>
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Exception_Trace := Unhandled_Raise_In_Main;
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end case;
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end Trace_On;
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end System.Exception_Traces;
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