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 --
10 -- Copyright (C) 1996-2001 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
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 GNAT.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
105 function Hash (F : Big_String_Ptr) return HTable_Headers is
108 Size : constant S := S (HTable_Headers'Last - HTable_Headers'First + 1);
115 if F (J) = ASCII.NUL then
116 return HTable_Headers'First + HTable_Headers'Base (Tmp mod Size);
118 Tmp := Tmp xor S (Character'Pos (F (J)));
124 ------------------------
125 -- Internal_Exception --
126 ------------------------
128 type String_Ptr is access all String;
130 function Internal_Exception (X : String) return Exception_Data_Ptr is
131 Copy : aliased String (X'First .. X'Last + 1);
132 Res : Exception_Data_Ptr;
133 Dyn_Copy : String_Ptr;
137 Copy (Copy'Last) := ASCII.NUL;
138 Res := Exception_HTable.Get (To_Ptr (Copy'Address));
140 -- If unknown exception, create it on the heap. This is a legitimate
141 -- situation in the distributed case when an exception is defined only
145 Dyn_Copy := new String'(Copy);
149 (Not_Handled_By_Others => False,
151 Name_Length => Copy'Length,
152 Full_Name => To_Ptr (Dyn_Copy.all'Address),
156 Register_Exception (Res);
160 end Internal_Exception;
162 ------------------------
163 -- Register_Exception --
164 ------------------------
166 procedure Register_Exception (X : Exception_Data_Ptr) is
168 Exception_HTable.Set (X);
169 end Register_Exception;
175 procedure Set_HT_Link
176 (T : Exception_Data_Ptr;
177 Next : Exception_Data_Ptr)
180 T.HTable_Ptr := Next;
184 Register_Exception (Abort_Signal_Def'Access);
185 Register_Exception (Tasking_Error_Def'Access);
186 Register_Exception (Storage_Error_Def'Access);
187 Register_Exception (Program_Error_Def'Access);
188 Register_Exception (Numeric_Error_Def'Access);
189 Register_Exception (Constraint_Error_Def'Access);
191 end System.Exception_Table;