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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- N L I S T S -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2010, 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. -- -- -- ------------------------------------------------------------------------------ -- This package provides facilities for manipulating lists of nodes (see -- package Atree for format and implementation of tree nodes). The Link field -- of the nodes is used as the forward pointer for these lists. See also -- package Elists which provides another form of lists that are not threaded -- through the nodes (and therefore allow nodes to be on multiple lists). with System; with Types; use Types; package Nlists is -- A node list is a list of nodes in a special format that means that -- nodes can be on at most one such list. For each node list, a list -- header is allocated in the lists table, and a List_Id value references -- this header, which may be used to access the nodes in the list using -- the set of routines that define this interface. -- Note: node lists can contain either nodes or entities (extended nodes) -- or a mixture of nodes and extended nodes. function In_Same_List (N1, N2 : Node_Or_Entity_Id) return Boolean; pragma Inline (In_Same_List); -- Equivalent to List_Containing (N1) = List_Containing (N2) function Last_List_Id return List_Id; pragma Inline (Last_List_Id); -- Returns Id of last allocated list header function Lists_Address return System.Address; pragma Inline (Lists_Address); -- Return address of Lists table (used in Back_End for Gigi call) function Num_Lists return Nat; pragma Inline (Num_Lists); -- Number of currently allocated lists function New_List return List_Id; -- Creates a new empty node list. Typically this is used to initialize -- a field in some other node which points to a node list where the list -- is then subsequently filled in using Append calls. function Empty_List return List_Id renames New_List; -- Used in contexts where an empty list (as opposed to an initially empty -- list to be filled in) is required. function New_List (Node : Node_Or_Entity_Id) return List_Id; -- Build a new list initially containing the given node function New_List (Node1 : Node_Or_Entity_Id; Node2 : Node_Or_Entity_Id) return List_Id; -- Build a new list initially containing the two given nodes function New_List (Node1 : Node_Or_Entity_Id; Node2 : Node_Or_Entity_Id; Node3 : Node_Or_Entity_Id) return List_Id; -- Build a new list initially containing the three given nodes function New_List (Node1 : Node_Or_Entity_Id; Node2 : Node_Or_Entity_Id; Node3 : Node_Or_Entity_Id; Node4 : Node_Or_Entity_Id) return List_Id; function New_List (Node1 : Node_Or_Entity_Id; Node2 : Node_Or_Entity_Id; Node3 : Node_Or_Entity_Id; Node4 : Node_Or_Entity_Id; Node5 : Node_Or_Entity_Id) return List_Id; -- Build a new list initially containing the five given nodes function New_List (Node1 : Node_Or_Entity_Id; Node2 : Node_Or_Entity_Id; Node3 : Node_Or_Entity_Id; Node4 : Node_Or_Entity_Id; Node5 : Node_Or_Entity_Id; Node6 : Node_Or_Entity_Id) return List_Id; -- Build a new list initially containing the six given nodes function New_Copy_List (List : List_Id) return List_Id; -- Creates a new list containing copies (made with Atree.New_Copy) of every -- node in the original list. If the argument is No_List, then the returned -- result is No_List. If the argument is an empty list, then the returned -- result is a new empty list. function New_Copy_List_Original (List : List_Id) return List_Id; -- Same as New_Copy_List but copies only nodes coming from source function First (List : List_Id) return Node_Or_Entity_Id; pragma Inline (First); -- Obtains the first element of the given node list or, if the node list -- has no items or is equal to No_List, then Empty is returned. function First_Non_Pragma (List : List_Id) return Node_Or_Entity_Id; -- Used when dealing with a list that can contain pragmas to skip past -- any initial pragmas and return the first element that is not a pragma. -- If the list is empty, or if it contains only pragmas, then Empty is -- returned. It is an error to call First_Non_Pragma with a Node_Id value -- or No_List (No_List is not considered to be the same as an empty list). -- This function also skips N_Null nodes which can result from rewriting -- unrecognized or incorrect pragmas. function Last (List : List_Id) return Node_Or_Entity_Id; pragma Inline (Last); -- Obtains the last element of the given node list or, if the node list -- has no items, then Empty is returned. It is an error to call Last with -- a Node_Id or No_List. (No_List is not considered to be the same as an -- empty node list). function Last_Non_Pragma (List : List_Id) return Node_Or_Entity_Id; -- Obtains the last element of a given node list that is not a pragma. -- If the list is empty, or if it contains only pragmas, then Empty is -- returned. It is an error to call Last_Non_Pragma with a Node_Id or -- No_List. (No_List is not considered to be the same as an empty list). function List_Length (List : List_Id) return Nat; pragma Inline (List_Length); -- Returns number of items in the given list. It is an error to call -- this function with No_List (No_List is not considered to be the same -- as an empty list). function Next (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id; pragma Inline (Next); -- This function returns the next node on a node list, or Empty if Node is -- the last element of the node list. The argument must be a member of a -- node list. procedure Next (Node : in out Node_Or_Entity_Id); pragma Inline (Next); -- Equivalent to Node := Next (Node); function Next_Non_Pragma (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id; -- This function returns the next node on a node list, skipping past any -- pragmas, or Empty if there is no non-pragma entry left. The argument -- must be a member of a node list. This function also skips N_Null nodes -- which can result from rewriting unrecognized or incorrect pragmas. procedure Next_Non_Pragma (Node : in out Node_Or_Entity_Id); pragma Inline (Next_Non_Pragma); -- Equivalent to Node := Next_Non_Pragma (Node); function Prev (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id; pragma Inline (Prev); -- This function returns the previous node on a node list, or Empty -- if Node is the first element of the node list. The argument must be -- a member of a node list. Note: the implementation does maintain back -- pointers, so this function executes quickly in constant time. function Pick (List : List_Id; Index : Pos) return Node_Or_Entity_Id; -- Given a list, picks out the Index'th entry (1 = first entry). The -- caller must ensure that Index is in range. procedure Prev (Node : in out Node_Or_Entity_Id); pragma Inline (Prev); -- Equivalent to Node := Prev (Node); function Prev_Non_Pragma (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id; pragma Inline (Prev_Non_Pragma); -- This function returns the previous node on a node list, skipping any -- pragmas. If Node is the first element of the list, or if the only -- elements preceding it are pragmas, then Empty is returned. The -- argument must be a member of a node list. Note: the implementation -- does maintain back pointers, so this function executes quickly in -- constant time. procedure Prev_Non_Pragma (Node : in out Node_Or_Entity_Id); pragma Inline (Prev_Non_Pragma); -- Equivalent to Node := Prev_Non_Pragma (Node); function Is_Empty_List (List : List_Id) return Boolean; pragma Inline (Is_Empty_List); -- This function determines if a given list id references a node list that -- contains no items. No_List as an argument returns True. function Is_Non_Empty_List (List : List_Id) return Boolean; pragma Inline (Is_Non_Empty_List); -- This function determines if a given list id references a node list that -- contains at least one item. No_List as an argument returns False. function Is_List_Member (Node : Node_Or_Entity_Id) return Boolean; pragma Inline (Is_List_Member); -- This function determines if a given node is a member of a node list. -- It is an error for Node to be Empty, or to be a node list. function List_Containing (Node : Node_Or_Entity_Id) return List_Id; pragma Inline (List_Containing); -- This function provides a pointer to the node list containing Node. -- Node must be a member of a node list. procedure Append (Node : Node_Or_Entity_Id; To : List_Id); -- Appends Node at the end of node list To. Node must be a non-empty node -- that is not already a member of a node list, and To must be a -- node list. An attempt to append an error node is ignored without -- complaint and the list is unchanged. procedure Append_To (To : List_Id; Node : Node_Or_Entity_Id); pragma Inline (Append_To); -- Like Append, but arguments are the other way round procedure Append_List (List : List_Id; To : List_Id); -- Appends node list List to the end of node list To. On return, -- List is reset to be empty. procedure Append_List_To (To : List_Id; List : List_Id); pragma Inline (Append_List_To); -- Like Append_List, but arguments are the other way round procedure Insert_After (After : Node_Or_Entity_Id; Node : Node_Or_Entity_Id); -- Insert Node, which must be a non-empty node that is not already a -- member of a node list, immediately past node After, which must be a -- node that is currently a member of a node list. An attempt to insert -- an error node is ignored without complaint (and the list is unchanged). procedure Insert_List_After (After : Node_Or_Entity_Id; List : List_Id); -- Inserts the entire contents of node list List immediately after node -- After, which must be a member of a node list. On return, the node list -- List is reset to be the empty node list. procedure Insert_Before (Before : Node_Or_Entity_Id; Node : Node_Or_Entity_Id); -- Insert Node, which must be a non-empty node that is not already a -- member of a node list, immediately before Before, which must be a node -- that is currently a member of a node list. An attempt to insert an -- error node is ignored without complaint (and the list is unchanged). procedure Insert_List_Before (Before : Node_Or_Entity_Id; List : List_Id); -- Inserts the entire contents of node list List immediately before node -- Before, which must be a member of a node list. On return, the node list -- List is reset to be the empty node list. procedure Prepend (Node : Node_Or_Entity_Id; To : List_Id); -- Prepends Node at the start of node list To. Node must be a non-empty -- node that is not already a member of a node list, and To must be a -- node list. An attempt to prepend an error node is ignored without -- complaint and the list is unchanged. procedure Prepend_To (To : List_Id; Node : Node_Or_Entity_Id); pragma Inline (Prepend_To); -- Like Prepend, but arguments are the other way round procedure Prepend_List (List : List_Id; To : List_Id); -- Prepends node list List to the start of node list To. On return, -- List is reset to be empty. procedure Prepend_List_To (To : List_Id; List : List_Id); pragma Inline (Prepend_List_To); -- Like Prepend_List, but arguments are the other way round procedure Remove (Node : Node_Or_Entity_Id); -- Removes Node, which must be a node that is a member of a node list, -- from this node list. The contents of Node are not otherwise affected. function Remove_Head (List : List_Id) return Node_Or_Entity_Id; -- Removes the head element of a node list, and returns the node (whose -- contents are not otherwise affected) as the result. If the node list -- is empty, then Empty is returned. function Remove_Next (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id; -- Removes the item immediately following the given node, and returns it -- as the result. If Node is the last element of the list, then Empty is -- returned. Node must be a member of a list. Unlike Remove, Remove_Next -- is fast and does not involve any list traversal. procedure Initialize; -- Called at the start of compilation of each new main source file to -- initialize the allocation of the list table. Note that Initialize -- must not be called if Tree_Read is used. procedure Lock; -- Called to lock tables before back end is called procedure Unlock; -- Unlock tables, in cases where the back end needs to modify them procedure Tree_Read; -- Initializes internal tables from current tree file using the relevant -- Table.Tree_Read routines. Note that Initialize should not be called if -- Tree_Read is used. Tree_Read includes all necessary initialization. procedure Tree_Write; -- Writes out internal tables to current tree file using the relevant -- Table.Tree_Write routines. function Parent (List : List_Id) return Node_Or_Entity_Id; pragma Inline (Parent); -- Node lists may have a parent in the same way as a node. The function -- accesses the Parent value, which is either Empty when a list header -- is first created, or the value that has been set by Set_Parent. procedure Set_Parent (List : List_Id; Node : Node_Or_Entity_Id); pragma Inline (Set_Parent); -- Sets the parent field of the given list to reference the given node function No (List : List_Id) return Boolean; pragma Inline (No); -- Tests given Id for equality with No_List. This allows notations like -- "if No (Statements)" as opposed to "if Statements = No_List". function Present (List : List_Id) return Boolean; pragma Inline (Present); -- Tests given Id for inequality with No_List. This allows notations like -- "if Present (Statements)" as opposed to "if Statements /= No_List". procedure Allocate_List_Tables (N : Node_Or_Entity_Id); -- Called when nodes table is expanded to include node N. This call -- makes sure that list structures internal to Nlists are adjusted -- appropriately to reflect this increase in the size of the nodes table. function Next_Node_Address return System.Address; function Prev_Node_Address return System.Address; -- These functions return the addresses of the Next_Node and Prev_Node -- tables (used in Back_End for Gigi). function p (U : Union_Id) return Node_Or_Entity_Id; -- This function is intended for use from the debugger, it determines -- whether U is a Node_Id or List_Id, and calls the appropriate Parent -- function and returns the parent Node in either case. This is shorter -- to type, and avoids the overloading problem of using Parent. It -- should NEVER be used except from the debugger. If p is called with -- other than a node or list id value, it returns 99_999_999. end Nlists;
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