1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . E X C E P T I O N _ T A B L E --
9 -- Copyright (C) 1996-2007, Free Software Foundation, Inc. --
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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 pragma Warnings (Off);
39 with System.Soft_Links; use System.Soft_Links;
41 package body System.Exception_Table is
43 use System.Standard_Library;
45 type HTable_Headers is range 1 .. 37;
47 procedure Set_HT_Link (T : Exception_Data_Ptr; Next : Exception_Data_Ptr);
48 function Get_HT_Link (T : Exception_Data_Ptr) return Exception_Data_Ptr;
50 function Hash (F : System.Address) return HTable_Headers;
51 function Equal (A, B : System.Address) return Boolean;
52 function Get_Key (T : Exception_Data_Ptr) return System.Address;
54 package Exception_HTable is new System.HTable.Static_HTable (
55 Header_Num => HTable_Headers,
56 Element => Exception_Data,
57 Elmt_Ptr => Exception_Data_Ptr,
59 Set_Next => Set_HT_Link,
61 Key => System.Address,
70 function Equal (A, B : System.Address) return Boolean is
71 S1 : constant Big_String_Ptr := To_Ptr (A);
72 S2 : constant Big_String_Ptr := To_Ptr (B);
77 if S1 (J) /= S2 (J) then
80 elsif S1 (J) = ASCII.NUL then
93 function Get_HT_Link (T : Exception_Data_Ptr) return Exception_Data_Ptr is
102 function Get_Key (T : Exception_Data_Ptr) return System.Address is
107 -------------------------------
108 -- Get_Registered_Exceptions --
109 -------------------------------
111 procedure Get_Registered_Exceptions
112 (List : out Exception_Data_Array;
115 Data : Exception_Data_Ptr := Exception_HTable.Get_First;
119 Last := List'First - 1;
121 while Last < List'Last and then Data /= null loop
124 Data := Exception_HTable.Get_Next;
128 end Get_Registered_Exceptions;
134 function Hash (F : System.Address) return HTable_Headers is
137 Str : constant Big_String_Ptr := To_Ptr (F);
138 Size : constant S := S (HTable_Headers'Last - HTable_Headers'First + 1);
145 if Str (J) = ASCII.NUL then
146 return HTable_Headers'First + HTable_Headers'Base (Tmp mod Size);
148 Tmp := Tmp xor S (Character'Pos (Str (J)));
154 ------------------------
155 -- Internal_Exception --
156 ------------------------
158 function Internal_Exception
160 Create_If_Not_Exist : Boolean := True) return Exception_Data_Ptr
162 type String_Ptr is access all String;
164 Copy : aliased String (X'First .. X'Last + 1);
165 Res : Exception_Data_Ptr;
166 Dyn_Copy : String_Ptr;
170 Copy (Copy'Last) := ASCII.NUL;
171 Res := Exception_HTable.Get (Copy'Address);
173 -- If unknown exception, create it on the heap. This is a legitimate
174 -- situation in the distributed case when an exception is defined only
177 if Res = null and then Create_If_Not_Exist then
178 Dyn_Copy := new String'(Copy);
182 (Not_Handled_By_Others => False,
184 Name_Length => Copy'Length,
185 Full_Name => Dyn_Copy.all'Address,
190 Register_Exception (Res);
194 end Internal_Exception;
196 ------------------------
197 -- Register_Exception --
198 ------------------------
200 procedure Register_Exception (X : Exception_Data_Ptr) is
202 Exception_HTable.Set (X);
203 end Register_Exception;
205 ---------------------------------
206 -- Registered_Exceptions_Count --
207 ---------------------------------
209 function Registered_Exceptions_Count return Natural is
210 Count : Natural := 0;
211 Data : Exception_Data_Ptr := Exception_HTable.Get_First;
214 -- We need to lock the runtime in the meantime, to avoid concurrent
215 -- access since we have only one iterator.
219 while Data /= null loop
221 Data := Exception_HTable.Get_Next;
226 end Registered_Exceptions_Count;
232 procedure Set_HT_Link
233 (T : Exception_Data_Ptr;
234 Next : Exception_Data_Ptr)
237 T.HTable_Ptr := Next;
240 -- Register the standard exceptions at elaboration time
243 Register_Exception (Abort_Signal_Def'Access);
244 Register_Exception (Tasking_Error_Def'Access);
245 Register_Exception (Storage_Error_Def'Access);
246 Register_Exception (Program_Error_Def'Access);
247 Register_Exception (Numeric_Error_Def'Access);
248 Register_Exception (Constraint_Error_Def'Access);
250 end System.Exception_Table;