------------------------------------------------------------------------------ -- -- -- 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) 2000-2019, 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 -- -- . -- -- -- -- 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;