------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S Y S T E M . E X C E P T I O N _ T A B L E -- -- -- -- B o d y -- -- -- -- Copyright (C) 1996-2009, Free Software Foundation, Inc. -- -- -- -- 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. -- -- -- ------------------------------------------------------------------------------ pragma Compiler_Unit; with System.HTable; with System.Soft_Links; use System.Soft_Links; package body System.Exception_Table is use System.Standard_Library; type HTable_Headers is range 1 .. 37; procedure Set_HT_Link (T : Exception_Data_Ptr; Next : Exception_Data_Ptr); function Get_HT_Link (T : Exception_Data_Ptr) return Exception_Data_Ptr; function Hash (F : System.Address) return HTable_Headers; function Equal (A, B : System.Address) return Boolean; function Get_Key (T : Exception_Data_Ptr) return System.Address; package Exception_HTable is new System.HTable.Static_HTable ( Header_Num => HTable_Headers, Element => Exception_Data, Elmt_Ptr => Exception_Data_Ptr, Null_Ptr => null, Set_Next => Set_HT_Link, Next => Get_HT_Link, Key => System.Address, Get_Key => Get_Key, Hash => Hash, Equal => Equal); ----------- -- Equal -- ----------- function Equal (A, B : System.Address) return Boolean is S1 : constant Big_String_Ptr := To_Ptr (A); S2 : constant Big_String_Ptr := To_Ptr (B); J : Integer := 1; begin loop if S1 (J) /= S2 (J) then return False; elsif S1 (J) = ASCII.NUL then return True; else J := J + 1; end if; end loop; end Equal; ----------------- -- Get_HT_Link -- ----------------- function Get_HT_Link (T : Exception_Data_Ptr) return Exception_Data_Ptr is begin return T.HTable_Ptr; end Get_HT_Link; ------------- -- Get_Key -- ------------- function Get_Key (T : Exception_Data_Ptr) return System.Address is begin return T.Full_Name; end Get_Key; ------------------------------- -- Get_Registered_Exceptions -- ------------------------------- procedure Get_Registered_Exceptions (List : out Exception_Data_Array; Last : out Integer) is Data : Exception_Data_Ptr := Exception_HTable.Get_First; begin Lock_Task.all; Last := List'First - 1; while Last < List'Last and then Data /= null loop Last := Last + 1; List (Last) := Data; Data := Exception_HTable.Get_Next; end loop; Unlock_Task.all; end Get_Registered_Exceptions; ---------- -- Hash -- ---------- function Hash (F : System.Address) return HTable_Headers is type S is mod 2**8; Str : constant Big_String_Ptr := To_Ptr (F); Size : constant S := S (HTable_Headers'Last - HTable_Headers'First + 1); Tmp : S := 0; J : Positive; begin J := 1; loop if Str (J) = ASCII.NUL then return HTable_Headers'First + HTable_Headers'Base (Tmp mod Size); else Tmp := Tmp xor S (Character'Pos (Str (J))); end if; J := J + 1; end loop; end Hash; ------------------------ -- Internal_Exception -- ------------------------ function Internal_Exception (X : String; Create_If_Not_Exist : Boolean := True) return Exception_Data_Ptr is type String_Ptr is access all String; Copy : aliased String (X'First .. X'Last + 1); Res : Exception_Data_Ptr; Dyn_Copy : String_Ptr; begin Copy (X'Range) := X; Copy (Copy'Last) := ASCII.NUL; Res := Exception_HTable.Get (Copy'Address); -- If unknown exception, create it on the heap. This is a legitimate -- situation in the distributed case when an exception is defined only -- in a partition if Res = null and then Create_If_Not_Exist then Dyn_Copy := new String'(Copy); Res := new Exception_Data' (Not_Handled_By_Others => False, Lang => 'A', Name_Length => Copy'Length, Full_Name => Dyn_Copy.all'Address, HTable_Ptr => null, Import_Code => 0, Raise_Hook => null); Register_Exception (Res); end if; return Res; end Internal_Exception; ------------------------ -- Register_Exception -- ------------------------ procedure Register_Exception (X : Exception_Data_Ptr) is begin Exception_HTable.Set (X); end Register_Exception; --------------------------------- -- Registered_Exceptions_Count -- --------------------------------- function Registered_Exceptions_Count return Natural is Count : Natural := 0; Data : Exception_Data_Ptr := Exception_HTable.Get_First; begin -- We need to lock the runtime in the meantime, to avoid concurrent -- access since we have only one iterator. Lock_Task.all; while Data /= null loop Count := Count + 1; Data := Exception_HTable.Get_Next; end loop; Unlock_Task.all; return Count; end Registered_Exceptions_Count; ----------------- -- Set_HT_Link -- ----------------- procedure Set_HT_Link (T : Exception_Data_Ptr; Next : Exception_Data_Ptr) is begin T.HTable_Ptr := Next; end Set_HT_Link; -- Register the standard exceptions at elaboration time begin Register_Exception (Abort_Signal_Def'Access); Register_Exception (Tasking_Error_Def'Access); Register_Exception (Storage_Error_Def'Access); Register_Exception (Program_Error_Def'Access); Register_Exception (Numeric_Error_Def'Access); Register_Exception (Constraint_Error_Def'Access); end System.Exception_Table;