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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              D E B U G _ A                               --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2007, 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.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package contains data and subprograms to support the A debug switch

--  that is used to generate output showing what node is being analyzed,

--  resolved, evaluated, or expanded.

with Types; use Types;

package Debug_A is

   --  Note: the following subprograms are used in a stack like manner, with

   --  an exit call matching each entry call. This means that they can keep

   --  track of the current node being worked on, with the entry call setting

   --  a new value, by pushing the Node_Id value on a stack, and the exit call

   --  popping this value off. Atree.Current_Error_Node is set by both the

   --  entry and exit routines to point to the current node so that an abort

   --  message indicates the node involved as accurately as possible.

   procedure Debug_A_Entry (S : String; N : Node_Id);

   pragma Inline (Debug_A_Entry);

   --  Generates a message prefixed by a sequence of bars showing the nesting

   --  depth (depth increases by 1 for a Debug_A_Entry call and is decreased

   --  by the corresponding Debug_A_Exit call). Then the string is output

   --  (analyzing, expanding etc), followed by the node number and its kind.

   --  This output is generated only if the debug A flag is set. If the debug

   --  A flag is not set, then no output is generated. This call also sets the

   --  Node_Id value in Atree.Current_Error_Node in case a bomb occurs. This

   --  is done unconditionally, whether or not the debug A flag is set.

   procedure Debug_A_Exit (S : String; N : Node_Id; Comment : String);

   pragma Inline (Debug_A_Exit);

   --  Generates the corresponding termination message. The message is preceded

   --  by a sequence of bars, followed by the string S, the node number, and

   --  a trailing comment (e.g. " (already evaluated)"). This output is

   --  generated only if the debug A flag is set. If the debug A flag is not

   --  set, then no output is generated. This call also resets the value in

   --  Atree.Current_Error_Node to what it was before the corresponding call

   --  to Debug_A_Entry.

end Debug_A;