gcc/ada/a-exexpr.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --  A D A . E X C E P T I O N S . E X C E P T I O N _ P R O P A G A T I O N --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2012, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This is the default version, using the __builtin_setjmp/longjmp EH
  33 --  mechanism.
  34
  35 with Ada.Unchecked_Conversion;
  36
  37 separate (Ada.Exceptions)
  38 package body Exception_Propagation is
  39
  40    --  Common binding to __builtin_longjmp for sjlj variants.
  41
  42    procedure builtin_longjmp (buffer : System.Address; Flag : Integer);
  43    pragma No_Return (builtin_longjmp);
  44    pragma Import (Intrinsic, builtin_longjmp, "__builtin_longjmp");
  45
  46    procedure Propagate_Continue (E : Exception_Id);
  47    pragma No_Return (Propagate_Continue);
  48    pragma Export (C, Propagate_Continue, "__gnat_raise_nodefer_with_msg");
  49    --  A call to this procedure is inserted automatically by GIGI, in order
  50    --  to continue the propagation when the exception was not handled.
  51    --  The linkage name is historical.
  52
  53    -------------------------
  54    -- Allocate_Occurrence --
  55    -------------------------
  56
  57    function Allocate_Occurrence return EOA is
  58    begin
  59       return Get_Current_Excep.all;
  60    end Allocate_Occurrence;
  61
  62    -------------------------
  63    -- Propagate_Exception --
  64    -------------------------
  65
  66    procedure Propagate_Exception (Excep : EOA) is
  67       Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
  68
  69    begin
  70       --  If the jump buffer pointer is non-null, transfer control using
  71       --  it. Otherwise announce an unhandled exception (note that this
  72       --  means that we have no finalizations to do other than at the outer
  73       --  level). Perform the necessary notification tasks in both cases.
  74
  75       if Jumpbuf_Ptr /= Null_Address then
  76          if not Excep.Exception_Raised then
  77             Excep.Exception_Raised := True;
  78             Exception_Traces.Notify_Handled_Exception (Excep);
  79          end if;
  80
  81          builtin_longjmp (Jumpbuf_Ptr, 1);
  82
  83       else
  84          Exception_Traces.Notify_Unhandled_Exception (Excep);
  85          Exception_Traces.Unhandled_Exception_Terminate (Excep);
  86       end if;
  87    end Propagate_Exception;
  88
  89    ------------------------
  90    -- Propagate_Continue --
  91    ------------------------
  92
  93    procedure Propagate_Continue (E : Exception_Id) is
  94       pragma Unreferenced (E);
  95    begin
  96       Propagate_Exception (Get_Current_Excep.all);
  97    end Propagate_Continue;
  98
  99 end Exception_Propagation;