gcc/ada/debug_a.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              D E B U G _ A                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.8 $                              --
  10 --                                                                          --
  11 --          Copyright (C) 1992-1998 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- GNAT was originally developed  by the GNAT team at  New York University. --
  25 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  26 --                                                                          --
  27 ------------------------------------------------------------------------------
  28
  29 --  This package contains data and subprograms to support the A debug switch
  30 --  that is used to generate output showing what node is being analyzed,
  31 --  resolved, evaluated, or expanded.
  32
  33 with Types; use Types;
  34
  35 package Debug_A is
  36
  37    --  Note: the following subprograms are used in a stack like manner, with
  38    --  an exit call matching each entry call. This means that they can keep
  39    --  track of the current node being worked on, with the entry call setting
  40    --  a new value, by pushing the Node_Id value on a stack, and the exit call
  41    --  popping this value off. Comperr.Current_Error_Node is set by both the
  42    --  entry and exit routines to point to the current node so that an abort
  43    --  message indicates the node involved as accurately as possible.
  44
  45    procedure Debug_A_Entry (S : String; N : Node_Id);
  46    pragma Inline (Debug_A_Entry);
  47    --  Generates a message prefixed by a sequence of bars showing the nesting
  48    --  depth (depth increases by 1 for a Debug_A_Entry call and is decreased
  49    --  by the corresponding Debug_A_Exit call). Then the string is output
  50    --  (analyzing, expanding etc), followed by the node number and its kind.
  51    --  This output is generated only if the debug A flag is set. If the debug
  52    --  A flag is not set, then no output is generated. This call also sets the
  53    --  Node_Id value in Comperr.Current_Error_Node in case a bomb occurs. This
  54    --  is done unconditionally, whether or not the debug A flag is set.
  55
  56    procedure Debug_A_Exit (S : String; N : Node_Id; Comment : String);
  57    pragma Inline (Debug_A_Exit);
  58    --  Generates the corresponding termination message. The message is preceded
  59    --  by a sequence of bars, followed by the string S, the node number, and
  60    --  a trailing comment (e.g. " (already evaluated)"). This output is
  61    --  generated only if the debug A flag is set. If the debug A flag is not
  62    --  set, then no output is generated. This call also resets the value in
  63    --  Comperr.Current_Error_Node to what it was before the corresponding call
  64    --  to Debug_A_Entry.
  65
  66 end Debug_A;