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) 1996-2003 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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, 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 ------------------------------------------------------------------------------
35 with System.Soft_Links; use System.Soft_Links;
37 package body System.Exception_Table is
39 use System.Standard_Library;
41 type HTable_Headers is range 1 .. 37;
43 procedure Set_HT_Link (T : Exception_Data_Ptr; Next : Exception_Data_Ptr);
44 function Get_HT_Link (T : Exception_Data_Ptr) return Exception_Data_Ptr;
46 function Hash (F : Big_String_Ptr) return HTable_Headers;
47 function Equal (A, B : Big_String_Ptr) return Boolean;
48 function Get_Key (T : Exception_Data_Ptr) return Big_String_Ptr;
50 package Exception_HTable is new System.HTable.Static_HTable (
51 Header_Num => HTable_Headers,
52 Element => Exception_Data,
53 Elmt_Ptr => Exception_Data_Ptr,
55 Set_Next => Set_HT_Link,
57 Key => Big_String_Ptr,
66 function Equal (A, B : Big_String_Ptr) return Boolean is
71 if A (J) /= B (J) then
74 elsif A (J) = ASCII.NUL then
87 function Get_HT_Link (T : Exception_Data_Ptr) return Exception_Data_Ptr is
96 function Get_Key (T : Exception_Data_Ptr) return Big_String_Ptr is
101 -------------------------------
102 -- Get_Registered_Exceptions --
103 -------------------------------
105 procedure Get_Registered_Exceptions
106 (List : out Exception_Data_Array;
109 Data : Exception_Data_Ptr := Exception_HTable.Get_First;
113 Last := List'First - 1;
115 while Last < List'Last and then Data /= null loop
118 Data := Exception_HTable.Get_Next;
122 end Get_Registered_Exceptions;
128 function Hash (F : Big_String_Ptr) return HTable_Headers is
131 Size : constant S := S (HTable_Headers'Last - HTable_Headers'First + 1);
138 if F (J) = ASCII.NUL then
139 return HTable_Headers'First + HTable_Headers'Base (Tmp mod Size);
141 Tmp := Tmp xor S (Character'Pos (F (J)));
147 ------------------------
148 -- Internal_Exception --
149 ------------------------
151 function Internal_Exception
153 Create_If_Not_Exist : Boolean := True) return Exception_Data_Ptr
155 type String_Ptr is access all String;
157 Copy : aliased String (X'First .. X'Last + 1);
158 Res : Exception_Data_Ptr;
159 Dyn_Copy : String_Ptr;
163 Copy (Copy'Last) := ASCII.NUL;
164 Res := Exception_HTable.Get (To_Ptr (Copy'Address));
166 -- If unknown exception, create it on the heap. This is a legitimate
167 -- situation in the distributed case when an exception is defined only
170 if Res = null and then Create_If_Not_Exist then
171 Dyn_Copy := new String'(Copy);
175 (Not_Handled_By_Others => False,
177 Name_Length => Copy'Length,
178 Full_Name => To_Ptr (Dyn_Copy.all'Address),
183 Register_Exception (Res);
187 end Internal_Exception;
189 ------------------------
190 -- Register_Exception --
191 ------------------------
193 procedure Register_Exception (X : Exception_Data_Ptr) is
195 Exception_HTable.Set (X);
196 end Register_Exception;
198 ---------------------------------
199 -- Registered_Exceptions_Count --
200 ---------------------------------
202 function Registered_Exceptions_Count return Natural is
203 Count : Natural := 0;
204 Data : Exception_Data_Ptr := Exception_HTable.Get_First;
207 -- We need to lock the runtime in the meantime, to avoid concurrent
208 -- access since we have only one iterator.
212 while Data /= null loop
214 Data := Exception_HTable.Get_Next;
219 end Registered_Exceptions_Count;
225 procedure Set_HT_Link
226 (T : Exception_Data_Ptr;
227 Next : Exception_Data_Ptr)
230 T.HTable_Ptr := Next;
233 -- Register the standard exceptions at elaboration time
236 Register_Exception (Abort_Signal_Def'Access);
237 Register_Exception (Tasking_Error_Def'Access);
238 Register_Exception (Storage_Error_Def'Access);
239 Register_Exception (Program_Error_Def'Access);
240 Register_Exception (Numeric_Error_Def'Access);
241 Register_Exception (Constraint_Error_Def'Access);
243 end System.Exception_Table;