/usr/share/ada/adainclude/gnatvsn/aspects.adb is in libgnatvsn7-dev 7.3.0-16ubuntu3.
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-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- A S P E C T S --
-- --
-- B o d y --
-- --
-- Copyright (C) 2010-2016, 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/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Atree; use Atree;
with Einfo; use Einfo;
with Nlists; use Nlists;
with Sinfo; use Sinfo;
with Tree_IO; use Tree_IO;
with GNAT.HTable; use GNAT.HTable;
package body Aspects is
-- The following array indicates aspects that a subtype inherits from its
-- base type. True means that the subtype inherits the aspect from its base
-- type. False means it is not inherited.
Base_Aspect : constant array (Aspect_Id) of Boolean :=
(Aspect_Atomic => True,
Aspect_Atomic_Components => True,
Aspect_Constant_Indexing => True,
Aspect_Default_Iterator => True,
Aspect_Discard_Names => True,
Aspect_Independent_Components => True,
Aspect_Iterator_Element => True,
Aspect_Type_Invariant => True,
Aspect_Unchecked_Union => True,
Aspect_Variable_Indexing => True,
Aspect_Volatile => True,
Aspect_Volatile_Full_Access => True,
others => False);
-- The following array indicates type aspects that are inherited and apply
-- to the class-wide type as well.
Inherited_Aspect : constant array (Aspect_Id) of Boolean :=
(Aspect_Constant_Indexing => True,
Aspect_Default_Iterator => True,
Aspect_Implicit_Dereference => True,
Aspect_Iterator_Element => True,
Aspect_Remote_Types => True,
Aspect_Variable_Indexing => True,
others => False);
procedure Set_Aspect_Specifications_No_Check (N : Node_Id; L : List_Id);
-- Same as Set_Aspect_Specifications, but does not contain the assertion
-- that checks that N does not already have aspect specifications. This
-- subprogram is supposed to be used as a part of Tree_Read. When reading
-- tree, first read nodes with their basic properties (as Atree.Tree_Read),
-- this includes reading the Has_Aspects flag for each node, then we reed
-- all the list tables and only after that we call Tree_Read for Aspects.
-- That is, when reading the tree, the list of aspects is attached to the
-- node that already has Has_Aspects flag set ON.
------------------------------------------
-- Hash Table for Aspect Specifications --
------------------------------------------
type AS_Hash_Range is range 0 .. 510;
-- Size of hash table headers
function AS_Hash (F : Node_Id) return AS_Hash_Range;
-- Hash function for hash table
function AS_Hash (F : Node_Id) return AS_Hash_Range is
begin
return AS_Hash_Range (F mod 511);
end AS_Hash;
package Aspect_Specifications_Hash_Table is new
GNAT.HTable.Simple_HTable
(Header_Num => AS_Hash_Range,
Element => List_Id,
No_Element => No_List,
Key => Node_Id,
Hash => AS_Hash,
Equal => "=");
-------------------------------------
-- Hash Table for Aspect Id Values --
-------------------------------------
type AI_Hash_Range is range 0 .. 112;
-- Size of hash table headers
function AI_Hash (F : Name_Id) return AI_Hash_Range;
-- Hash function for hash table
function AI_Hash (F : Name_Id) return AI_Hash_Range is
begin
return AI_Hash_Range (F mod 113);
end AI_Hash;
package Aspect_Id_Hash_Table is new
GNAT.HTable.Simple_HTable
(Header_Num => AI_Hash_Range,
Element => Aspect_Id,
No_Element => No_Aspect,
Key => Name_Id,
Hash => AI_Hash,
Equal => "=");
---------------------------
-- Aspect_Specifications --
---------------------------
function Aspect_Specifications (N : Node_Id) return List_Id is
begin
if Has_Aspects (N) then
return Aspect_Specifications_Hash_Table.Get (N);
else
return No_List;
end if;
end Aspect_Specifications;
--------------------------------
-- Aspects_On_Body_Or_Stub_OK --
--------------------------------
function Aspects_On_Body_Or_Stub_OK (N : Node_Id) return Boolean is
Aspect : Node_Id;
Aspects : List_Id;
begin
-- The routine should be invoked on a body [stub] with aspects
pragma Assert (Has_Aspects (N));
pragma Assert (Nkind (N) in N_Body_Stub
or else Nkind_In (N, N_Entry_Body,
N_Package_Body,
N_Protected_Body,
N_Subprogram_Body,
N_Task_Body));
-- Look through all aspects and see whether they can be applied to a
-- body [stub].
Aspects := Aspect_Specifications (N);
Aspect := First (Aspects);
while Present (Aspect) loop
if not Aspect_On_Body_Or_Stub_OK (Get_Aspect_Id (Aspect)) then
return False;
end if;
Next (Aspect);
end loop;
return True;
end Aspects_On_Body_Or_Stub_OK;
----------------------
-- Exchange_Aspects --
----------------------
procedure Exchange_Aspects (N1 : Node_Id; N2 : Node_Id) is
begin
pragma Assert
(Permits_Aspect_Specifications (N1)
and then Permits_Aspect_Specifications (N2));
-- Perform the exchange only when both nodes have lists to be swapped
if Has_Aspects (N1) and then Has_Aspects (N2) then
declare
L1 : constant List_Id := Aspect_Specifications (N1);
L2 : constant List_Id := Aspect_Specifications (N2);
begin
Set_Parent (L1, N2);
Set_Parent (L2, N1);
Aspect_Specifications_Hash_Table.Set (N1, L2);
Aspect_Specifications_Hash_Table.Set (N2, L1);
end;
end if;
end Exchange_Aspects;
-----------------
-- Find_Aspect --
-----------------
function Find_Aspect (Id : Entity_Id; A : Aspect_Id) return Node_Id is
Decl : Node_Id;
Item : Node_Id;
Owner : Entity_Id;
Spec : Node_Id;
begin
Owner := Id;
-- Handle various cases of base or inherited aspects for types
if Is_Type (Id) then
if Base_Aspect (A) then
Owner := Base_Type (Owner);
end if;
if Is_Class_Wide_Type (Owner) and then Inherited_Aspect (A) then
Owner := Root_Type (Owner);
end if;
if Is_Private_Type (Owner) and then Present (Full_View (Owner)) then
Owner := Full_View (Owner);
end if;
end if;
-- Search the representation items for the desired aspect
Item := First_Rep_Item (Owner);
while Present (Item) loop
if Nkind (Item) = N_Aspect_Specification
and then Get_Aspect_Id (Item) = A
then
return Item;
end if;
Next_Rep_Item (Item);
end loop;
-- Note that not all aspects are added to the chain of representation
-- items. In such cases, search the list of aspect specifications. First
-- find the declaration node where the aspects reside. This is usually
-- the parent or the parent of the parent.
Decl := Parent (Owner);
if not Permits_Aspect_Specifications (Decl) then
Decl := Parent (Decl);
end if;
-- Search the list of aspect specifications for the desired aspect
if Permits_Aspect_Specifications (Decl) then
Spec := First (Aspect_Specifications (Decl));
while Present (Spec) loop
if Get_Aspect_Id (Spec) = A then
return Spec;
end if;
Next (Spec);
end loop;
end if;
-- The entity does not carry any aspects or the desired aspect was not
-- found.
return Empty;
end Find_Aspect;
--------------------------
-- Find_Value_Of_Aspect --
--------------------------
function Find_Value_Of_Aspect
(Id : Entity_Id;
A : Aspect_Id) return Node_Id
is
Spec : constant Node_Id := Find_Aspect (Id, A);
begin
if Present (Spec) then
if A = Aspect_Default_Iterator then
return Expression (Aspect_Rep_Item (Spec));
else
return Expression (Spec);
end if;
end if;
return Empty;
end Find_Value_Of_Aspect;
-------------------
-- Get_Aspect_Id --
-------------------
function Get_Aspect_Id (Name : Name_Id) return Aspect_Id is
begin
return Aspect_Id_Hash_Table.Get (Name);
end Get_Aspect_Id;
function Get_Aspect_Id (Aspect : Node_Id) return Aspect_Id is
begin
pragma Assert (Nkind (Aspect) = N_Aspect_Specification);
return Aspect_Id_Hash_Table.Get (Chars (Identifier (Aspect)));
end Get_Aspect_Id;
----------------
-- Has_Aspect --
----------------
function Has_Aspect (Id : Entity_Id; A : Aspect_Id) return Boolean is
begin
return Present (Find_Aspect (Id, A));
end Has_Aspect;
------------------
-- Move_Aspects --
------------------
procedure Move_Aspects (From : Node_Id; To : Node_Id) is
pragma Assert (not Has_Aspects (To));
begin
if Has_Aspects (From) then
Set_Aspect_Specifications (To, Aspect_Specifications (From));
Aspect_Specifications_Hash_Table.Remove (From);
Set_Has_Aspects (From, False);
end if;
end Move_Aspects;
---------------------------
-- Move_Or_Merge_Aspects --
---------------------------
procedure Move_Or_Merge_Aspects (From : Node_Id; To : Node_Id) is
procedure Relocate_Aspect (Asp : Node_Id);
-- Move aspect specification Asp to the aspect specifications of node To
---------------------
-- Relocate_Aspect --
---------------------
procedure Relocate_Aspect (Asp : Node_Id) is
Asps : List_Id;
begin
if Has_Aspects (To) then
Asps := Aspect_Specifications (To);
-- Create a new aspect specification list for node To
else
Asps := New_List;
Set_Aspect_Specifications (To, Asps);
Set_Has_Aspects (To);
end if;
-- Remove the aspect from its original owner and relocate it to node
-- To.
Remove (Asp);
Append (Asp, Asps);
end Relocate_Aspect;
-- Local variables
Asp : Node_Id;
Asp_Id : Aspect_Id;
Next_Asp : Node_Id;
-- Start of processing for Move_Or_Merge_Aspects
begin
if Has_Aspects (From) then
Asp := First (Aspect_Specifications (From));
while Present (Asp) loop
-- Store the next aspect now as a potential relocation will alter
-- the contents of the list.
Next_Asp := Next (Asp);
-- When moving or merging aspects from a subprogram body stub that
-- also acts as a spec, relocate only those aspects that may apply
-- to a body [stub]. Note that a precondition must also be moved
-- to the proper body as the pre/post machinery expects it to be
-- there.
if Nkind (From) = N_Subprogram_Body_Stub
and then No (Corresponding_Spec_Of_Stub (From))
then
Asp_Id := Get_Aspect_Id (Asp);
if Aspect_On_Body_Or_Stub_OK (Asp_Id)
or else Asp_Id = Aspect_Pre
or else Asp_Id = Aspect_Precondition
then
Relocate_Aspect (Asp);
end if;
-- When moving or merging aspects from a single concurrent type
-- declaration, relocate only those aspects that may apply to the
-- anonymous object created for the type.
-- Note: It is better to use Is_Single_Concurrent_Type_Declaration
-- here, but Aspects and Sem_Util have incompatible licenses.
elsif Nkind_In
(Original_Node (From), N_Single_Protected_Declaration,
N_Single_Task_Declaration)
then
Asp_Id := Get_Aspect_Id (Asp);
if Aspect_On_Anonymous_Object_OK (Asp_Id) then
Relocate_Aspect (Asp);
end if;
-- Default case - relocate the aspect to its new owner
else
Relocate_Aspect (Asp);
end if;
Asp := Next_Asp;
end loop;
-- The relocations may have left node From's aspect specifications
-- list empty. If this is the case, simply remove the aspects.
if Is_Empty_List (Aspect_Specifications (From)) then
Remove_Aspects (From);
end if;
end if;
end Move_Or_Merge_Aspects;
-----------------------------------
-- Permits_Aspect_Specifications --
-----------------------------------
Has_Aspect_Specifications_Flag : constant array (Node_Kind) of Boolean :=
(N_Abstract_Subprogram_Declaration => True,
N_Component_Declaration => True,
N_Entry_Body => True,
N_Entry_Declaration => True,
N_Exception_Declaration => True,
N_Exception_Renaming_Declaration => True,
N_Expression_Function => True,
N_Formal_Abstract_Subprogram_Declaration => True,
N_Formal_Concrete_Subprogram_Declaration => True,
N_Formal_Object_Declaration => True,
N_Formal_Package_Declaration => True,
N_Formal_Type_Declaration => True,
N_Full_Type_Declaration => True,
N_Function_Instantiation => True,
N_Generic_Package_Declaration => True,
N_Generic_Renaming_Declaration => True,
N_Generic_Subprogram_Declaration => True,
N_Object_Declaration => True,
N_Object_Renaming_Declaration => True,
N_Package_Body => True,
N_Package_Body_Stub => True,
N_Package_Declaration => True,
N_Package_Instantiation => True,
N_Package_Specification => True,
N_Package_Renaming_Declaration => True,
N_Private_Extension_Declaration => True,
N_Private_Type_Declaration => True,
N_Procedure_Instantiation => True,
N_Protected_Body => True,
N_Protected_Body_Stub => True,
N_Protected_Type_Declaration => True,
N_Single_Protected_Declaration => True,
N_Single_Task_Declaration => True,
N_Subprogram_Body => True,
N_Subprogram_Body_Stub => True,
N_Subprogram_Declaration => True,
N_Subprogram_Renaming_Declaration => True,
N_Subtype_Declaration => True,
N_Task_Body => True,
N_Task_Body_Stub => True,
N_Task_Type_Declaration => True,
others => False);
function Permits_Aspect_Specifications (N : Node_Id) return Boolean is
begin
return Has_Aspect_Specifications_Flag (Nkind (N));
end Permits_Aspect_Specifications;
--------------------
-- Remove_Aspects --
--------------------
procedure Remove_Aspects (N : Node_Id) is
begin
if Has_Aspects (N) then
Aspect_Specifications_Hash_Table.Remove (N);
Set_Has_Aspects (N, False);
end if;
end Remove_Aspects;
-----------------
-- Same_Aspect --
-----------------
-- Table used for Same_Aspect, maps aspect to canonical aspect
Canonical_Aspect : constant array (Aspect_Id) of Aspect_Id :=
(No_Aspect => No_Aspect,
Aspect_Abstract_State => Aspect_Abstract_State,
Aspect_Address => Aspect_Address,
Aspect_Alignment => Aspect_Alignment,
Aspect_All_Calls_Remote => Aspect_All_Calls_Remote,
Aspect_Annotate => Aspect_Annotate,
Aspect_Async_Readers => Aspect_Async_Readers,
Aspect_Async_Writers => Aspect_Async_Writers,
Aspect_Asynchronous => Aspect_Asynchronous,
Aspect_Atomic => Aspect_Atomic,
Aspect_Atomic_Components => Aspect_Atomic_Components,
Aspect_Attach_Handler => Aspect_Attach_Handler,
Aspect_Bit_Order => Aspect_Bit_Order,
Aspect_Component_Size => Aspect_Component_Size,
Aspect_Constant_After_Elaboration => Aspect_Constant_After_Elaboration,
Aspect_Constant_Indexing => Aspect_Constant_Indexing,
Aspect_Contract_Cases => Aspect_Contract_Cases,
Aspect_Convention => Aspect_Convention,
Aspect_CPU => Aspect_CPU,
Aspect_Default_Component_Value => Aspect_Default_Component_Value,
Aspect_Default_Initial_Condition => Aspect_Default_Initial_Condition,
Aspect_Default_Iterator => Aspect_Default_Iterator,
Aspect_Default_Storage_Pool => Aspect_Default_Storage_Pool,
Aspect_Default_Value => Aspect_Default_Value,
Aspect_Depends => Aspect_Depends,
Aspect_Dimension => Aspect_Dimension,
Aspect_Dimension_System => Aspect_Dimension_System,
Aspect_Disable_Controlled => Aspect_Disable_Controlled,
Aspect_Discard_Names => Aspect_Discard_Names,
Aspect_Dispatching_Domain => Aspect_Dispatching_Domain,
Aspect_Dynamic_Predicate => Aspect_Predicate,
Aspect_Effective_Reads => Aspect_Effective_Reads,
Aspect_Effective_Writes => Aspect_Effective_Writes,
Aspect_Elaborate_Body => Aspect_Elaborate_Body,
Aspect_Export => Aspect_Export,
Aspect_Extensions_Visible => Aspect_Extensions_Visible,
Aspect_External_Name => Aspect_External_Name,
Aspect_External_Tag => Aspect_External_Tag,
Aspect_Favor_Top_Level => Aspect_Favor_Top_Level,
Aspect_Ghost => Aspect_Ghost,
Aspect_Global => Aspect_Global,
Aspect_Implicit_Dereference => Aspect_Implicit_Dereference,
Aspect_Import => Aspect_Import,
Aspect_Independent => Aspect_Independent,
Aspect_Independent_Components => Aspect_Independent_Components,
Aspect_Inline => Aspect_Inline,
Aspect_Inline_Always => Aspect_Inline,
Aspect_Initial_Condition => Aspect_Initial_Condition,
Aspect_Initializes => Aspect_Initializes,
Aspect_Input => Aspect_Input,
Aspect_Interrupt_Handler => Aspect_Interrupt_Handler,
Aspect_Interrupt_Priority => Aspect_Priority,
Aspect_Invariant => Aspect_Invariant,
Aspect_Iterable => Aspect_Iterable,
Aspect_Iterator_Element => Aspect_Iterator_Element,
Aspect_Link_Name => Aspect_Link_Name,
Aspect_Linker_Section => Aspect_Linker_Section,
Aspect_Lock_Free => Aspect_Lock_Free,
Aspect_Machine_Radix => Aspect_Machine_Radix,
Aspect_Max_Queue_Length => Aspect_Max_Queue_Length,
Aspect_No_Elaboration_Code_All => Aspect_No_Elaboration_Code_All,
Aspect_No_Return => Aspect_No_Return,
Aspect_No_Tagged_Streams => Aspect_No_Tagged_Streams,
Aspect_Obsolescent => Aspect_Obsolescent,
Aspect_Object_Size => Aspect_Object_Size,
Aspect_Output => Aspect_Output,
Aspect_Pack => Aspect_Pack,
Aspect_Part_Of => Aspect_Part_Of,
Aspect_Persistent_BSS => Aspect_Persistent_BSS,
Aspect_Post => Aspect_Post,
Aspect_Postcondition => Aspect_Post,
Aspect_Pre => Aspect_Pre,
Aspect_Precondition => Aspect_Pre,
Aspect_Predicate => Aspect_Predicate,
Aspect_Predicate_Failure => Aspect_Predicate_Failure,
Aspect_Preelaborate => Aspect_Preelaborate,
Aspect_Preelaborable_Initialization => Aspect_Preelaborable_Initialization,
Aspect_Priority => Aspect_Priority,
Aspect_Pure => Aspect_Pure,
Aspect_Pure_Function => Aspect_Pure_Function,
Aspect_Refined_Depends => Aspect_Refined_Depends,
Aspect_Refined_Global => Aspect_Refined_Global,
Aspect_Refined_Post => Aspect_Refined_Post,
Aspect_Refined_State => Aspect_Refined_State,
Aspect_Remote_Access_Type => Aspect_Remote_Access_Type,
Aspect_Remote_Call_Interface => Aspect_Remote_Call_Interface,
Aspect_Remote_Types => Aspect_Remote_Types,
Aspect_Read => Aspect_Read,
Aspect_Relative_Deadline => Aspect_Relative_Deadline,
Aspect_Scalar_Storage_Order => Aspect_Scalar_Storage_Order,
Aspect_Secondary_Stack_Size => Aspect_Secondary_Stack_Size,
Aspect_Shared => Aspect_Atomic,
Aspect_Shared_Passive => Aspect_Shared_Passive,
Aspect_Simple_Storage_Pool => Aspect_Simple_Storage_Pool,
Aspect_Simple_Storage_Pool_Type => Aspect_Simple_Storage_Pool_Type,
Aspect_Size => Aspect_Size,
Aspect_Small => Aspect_Small,
Aspect_SPARK_Mode => Aspect_SPARK_Mode,
Aspect_Static_Predicate => Aspect_Predicate,
Aspect_Storage_Pool => Aspect_Storage_Pool,
Aspect_Storage_Size => Aspect_Storage_Size,
Aspect_Stream_Size => Aspect_Stream_Size,
Aspect_Suppress => Aspect_Suppress,
Aspect_Suppress_Debug_Info => Aspect_Suppress_Debug_Info,
Aspect_Suppress_Initialization => Aspect_Suppress_Initialization,
Aspect_Synchronization => Aspect_Synchronization,
Aspect_Test_Case => Aspect_Test_Case,
Aspect_Thread_Local_Storage => Aspect_Thread_Local_Storage,
Aspect_Type_Invariant => Aspect_Invariant,
Aspect_Unchecked_Union => Aspect_Unchecked_Union,
Aspect_Unimplemented => Aspect_Unimplemented,
Aspect_Universal_Aliasing => Aspect_Universal_Aliasing,
Aspect_Universal_Data => Aspect_Universal_Data,
Aspect_Unmodified => Aspect_Unmodified,
Aspect_Unreferenced => Aspect_Unreferenced,
Aspect_Unreferenced_Objects => Aspect_Unreferenced_Objects,
Aspect_Unsuppress => Aspect_Unsuppress,
Aspect_Variable_Indexing => Aspect_Variable_Indexing,
Aspect_Value_Size => Aspect_Value_Size,
Aspect_Volatile => Aspect_Volatile,
Aspect_Volatile_Components => Aspect_Volatile_Components,
Aspect_Volatile_Full_Access => Aspect_Volatile_Full_Access,
Aspect_Volatile_Function => Aspect_Volatile_Function,
Aspect_Warnings => Aspect_Warnings,
Aspect_Write => Aspect_Write);
function Same_Aspect (A1 : Aspect_Id; A2 : Aspect_Id) return Boolean is
begin
return Canonical_Aspect (A1) = Canonical_Aspect (A2);
end Same_Aspect;
-------------------------------
-- Set_Aspect_Specifications --
-------------------------------
procedure Set_Aspect_Specifications (N : Node_Id; L : List_Id) is
begin
pragma Assert (Permits_Aspect_Specifications (N));
pragma Assert (not Has_Aspects (N));
pragma Assert (L /= No_List);
Set_Has_Aspects (N);
Set_Parent (L, N);
Aspect_Specifications_Hash_Table.Set (N, L);
end Set_Aspect_Specifications;
----------------------------------------
-- Set_Aspect_Specifications_No_Check --
----------------------------------------
procedure Set_Aspect_Specifications_No_Check (N : Node_Id; L : List_Id) is
begin
pragma Assert (Permits_Aspect_Specifications (N));
pragma Assert (L /= No_List);
Set_Has_Aspects (N);
Set_Parent (L, N);
Aspect_Specifications_Hash_Table.Set (N, L);
end Set_Aspect_Specifications_No_Check;
---------------
-- Tree_Read --
---------------
procedure Tree_Read is
Node : Node_Id;
List : List_Id;
begin
loop
Tree_Read_Int (Int (Node));
Tree_Read_Int (Int (List));
exit when List = No_List;
Set_Aspect_Specifications_No_Check (Node, List);
end loop;
end Tree_Read;
----------------
-- Tree_Write --
----------------
procedure Tree_Write is
Node : Node_Id := Empty;
List : List_Id;
begin
Aspect_Specifications_Hash_Table.Get_First (Node, List);
loop
Tree_Write_Int (Int (Node));
Tree_Write_Int (Int (List));
exit when List = No_List;
Aspect_Specifications_Hash_Table.Get_Next (Node, List);
end loop;
end Tree_Write;
-- Package initialization sets up Aspect Id hash table
begin
for J in Aspect_Id loop
Aspect_Id_Hash_Table.Set (Aspect_Names (J), J);
end loop;
end Aspects;
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