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Diffstat (limited to 'gcc/ada/a-chtgke.adb')
| -rw-r--r-- | gcc/ada/a-chtgke.adb | 329 |
1 files changed, 0 insertions, 329 deletions
diff --git a/gcc/ada/a-chtgke.adb b/gcc/ada/a-chtgke.adb deleted file mode 100644 index cab0c09bc35..00000000000 --- a/gcc/ada/a-chtgke.adb +++ /dev/null @@ -1,329 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT LIBRARY COMPONENTS -- --- -- --- ADA.CONTAINERS.HASH_TABLES.GENERIC_KEYS -- --- -- --- B o d y -- --- -- --- Copyright (C) 2004-2015, 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 -- --- <http://www.gnu.org/licenses/>. -- --- -- --- This unit was originally developed by Matthew J Heaney. -- ------------------------------------------------------------------------------- - -package body Ada.Containers.Hash_Tables.Generic_Keys is - - pragma Warnings (Off, "variable ""Busy*"" is not referenced"); - pragma Warnings (Off, "variable ""Lock*"" is not referenced"); - -- See comment in Ada.Containers.Helpers - - ----------------------------- - -- Checked_Equivalent_Keys -- - ----------------------------- - - function Checked_Equivalent_Keys - (HT : aliased in out Hash_Table_Type; - Key : Key_Type; - Node : Node_Access) return Boolean - is - Lock : With_Lock (HT.TC'Unrestricted_Access); - begin - return Equivalent_Keys (Key, Node); - end Checked_Equivalent_Keys; - - ------------------- - -- Checked_Index -- - ------------------- - - function Checked_Index - (HT : aliased in out Hash_Table_Type; - Key : Key_Type) return Hash_Type - is - Lock : With_Lock (HT.TC'Unrestricted_Access); - begin - return Hash (Key) mod HT.Buckets'Length; - end Checked_Index; - - -------------------------- - -- Delete_Key_Sans_Free -- - -------------------------- - - procedure Delete_Key_Sans_Free - (HT : in out Hash_Table_Type; - Key : Key_Type; - X : out Node_Access) - is - Indx : Hash_Type; - Prev : Node_Access; - - begin - if HT.Length = 0 then - X := null; - return; - end if; - - -- Per AI05-0022, the container implementation is required to detect - -- element tampering by a generic actual subprogram. - - TC_Check (HT.TC); - - Indx := Checked_Index (HT, Key); - X := HT.Buckets (Indx); - - if X = null then - return; - end if; - - if Checked_Equivalent_Keys (HT, Key, X) then - TC_Check (HT.TC); - HT.Buckets (Indx) := Next (X); - HT.Length := HT.Length - 1; - return; - end if; - - loop - Prev := X; - X := Next (Prev); - - if X = null then - return; - end if; - - if Checked_Equivalent_Keys (HT, Key, X) then - TC_Check (HT.TC); - Set_Next (Node => Prev, Next => Next (X)); - HT.Length := HT.Length - 1; - return; - end if; - end loop; - end Delete_Key_Sans_Free; - - ---------- - -- Find -- - ---------- - - function Find - (HT : aliased in out Hash_Table_Type; - Key : Key_Type) return Node_Access - is - Indx : Hash_Type; - Node : Node_Access; - - begin - if HT.Length = 0 then - return null; - end if; - - Indx := Checked_Index (HT, Key); - - Node := HT.Buckets (Indx); - while Node /= null loop - if Checked_Equivalent_Keys (HT, Key, Node) then - return Node; - end if; - Node := Next (Node); - end loop; - - return null; - end Find; - - -------------------------------- - -- Generic_Conditional_Insert -- - -------------------------------- - - procedure Generic_Conditional_Insert - (HT : in out Hash_Table_Type; - Key : Key_Type; - Node : out Node_Access; - Inserted : out Boolean) - is - Indx : Hash_Type; - - begin - -- Per AI05-0022, the container implementation is required to detect - -- element tampering by a generic actual subprogram. - - TC_Check (HT.TC); - - Indx := Checked_Index (HT, Key); - Node := HT.Buckets (Indx); - - if Node = null then - if Checks and then HT.Length = Count_Type'Last then - raise Constraint_Error; - end if; - - Node := New_Node (Next => null); - Inserted := True; - - HT.Buckets (Indx) := Node; - HT.Length := HT.Length + 1; - - return; - end if; - - loop - if Checked_Equivalent_Keys (HT, Key, Node) then - Inserted := False; - return; - end if; - - Node := Next (Node); - - exit when Node = null; - end loop; - - if Checks and then HT.Length = Count_Type'Last then - raise Constraint_Error; - end if; - - Node := New_Node (Next => HT.Buckets (Indx)); - Inserted := True; - - HT.Buckets (Indx) := Node; - HT.Length := HT.Length + 1; - end Generic_Conditional_Insert; - - ----------------------------- - -- Generic_Replace_Element -- - ----------------------------- - - procedure Generic_Replace_Element - (HT : in out Hash_Table_Type; - Node : Node_Access; - Key : Key_Type) - is - pragma Assert (HT.Length > 0); - pragma Assert (Node /= null); - - Old_Indx : Hash_Type; - New_Indx : constant Hash_Type := Checked_Index (HT, Key); - - New_Bucket : Node_Access renames HT.Buckets (New_Indx); - N, M : Node_Access; - - begin - -- Per AI05-0022, the container implementation is required to detect - -- element tampering by a generic actual subprogram. - - declare - Lock : With_Lock (HT.TC'Unrestricted_Access); - begin - Old_Indx := Hash (Node) mod HT.Buckets'Length; - end; - - if Checked_Equivalent_Keys (HT, Key, Node) then - TE_Check (HT.TC); - - -- We can change a node's key to Key (that's what Assign is for), but - -- only if Key is not already in the hash table. (In a unique-key - -- hash table as this one a key is mapped to exactly one node only.) - -- The exception is when Key is mapped to Node, in which case the - -- change is allowed. - - Assign (Node, Key); - return; - end if; - - -- Key is not equivalent to Node, so we now have to determine if it's - -- equivalent to some other node in the hash table. This is the case - -- irrespective of whether Key is in the same or a different bucket from - -- Node. - - N := New_Bucket; - while N /= null loop - if Checks and then Checked_Equivalent_Keys (HT, Key, N) then - pragma Assert (N /= Node); - raise Program_Error with - "attempt to replace existing element"; - end if; - - N := Next (N); - end loop; - - -- We have determined that Key is not already in the hash table, so - -- the change is tentatively allowed. We now perform the standard - -- checks to determine whether the hash table is locked (because you - -- cannot change an element while it's in use by Query_Element or - -- Update_Element), or if the container is busy (because moving a - -- node to a different bucket would interfere with iteration). - - if Old_Indx = New_Indx then - -- The node is already in the bucket implied by Key. In this case - -- we merely change its value without moving it. - - TE_Check (HT.TC); - - Assign (Node, Key); - return; - end if; - - -- The node is a bucket different from the bucket implied by Key - - TC_Check (HT.TC); - - -- Do the assignment first, before moving the node, so that if Assign - -- propagates an exception, then the hash table will not have been - -- modified (except for any possible side-effect Assign had on Node). - - Assign (Node, Key); - - -- Now we can safely remove the node from its current bucket - - N := HT.Buckets (Old_Indx); - pragma Assert (N /= null); - - if N = Node then - HT.Buckets (Old_Indx) := Next (Node); - - else - pragma Assert (HT.Length > 1); - - loop - M := Next (N); - pragma Assert (M /= null); - - if M = Node then - Set_Next (Node => N, Next => Next (Node)); - exit; - end if; - - N := M; - end loop; - end if; - - -- Now we link the node into its new bucket (corresponding to Key) - - Set_Next (Node => Node, Next => New_Bucket); - New_Bucket := Node; - end Generic_Replace_Element; - - ----------- - -- Index -- - ----------- - - function Index - (HT : Hash_Table_Type; - Key : Key_Type) return Hash_Type - is - begin - return Hash (Key) mod HT.Buckets'Length; - end Index; - -end Ada.Containers.Hash_Tables.Generic_Keys; |