gcc/ada/debug_a.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              D E B U G _ A                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.1.16.1 $
  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 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  26 --                                                                          --
  27 ------------------------------------------------------------------------------
  28
  29 with Atree;   use Atree;
  30 with Debug;   use Debug;
  31 with Sinfo;   use Sinfo;
  32 with Sinput;  use Sinput;
  33 with Output;  use Output;
  34
  35 package body Debug_A is
  36
  37    Debug_A_Depth : Natural := 0;
  38    --  Output for the debug A flag is preceded by a sequence of vertical bar
  39    --  characters corresponding to the recursion depth of the actions being
  40    --  recorded (analysis, expansion, resolution and evaluation of nodes)
  41    --  This variable records the depth.
  42
  43    Max_Node_Ids : constant := 200;
  44    --  Maximum number of Node_Id values that get stacked
  45
  46    Node_Ids : array (1 .. Max_Node_Ids) of Node_Id;
  47    --  A stack used to keep track of Node_Id values for setting the value of
  48    --  Current_Error_Node correctly. Note that if we have more than 200
  49    --  recursion levels, we just don't reset the right value on exit, which
  50    --  is not crucial, since this is only for debugging!
  51
  52    -----------------------
  53    -- Local Subprograms --
  54    -----------------------
  55
  56    procedure Debug_Output_Astring;
  57    --  Outputs Debug_A_Depth number of vertical bars, used to preface messages
  58
  59    -------------------
  60    -- Debug_A_Entry --
  61    -------------------
  62
  63    procedure Debug_A_Entry (S : String; N : Node_Id) is
  64    begin
  65       if Debug_Flag_A then
  66          Debug_Output_Astring;
  67          Write_Str (S);
  68          Write_Str ("Node_Id = ");
  69          Write_Int (Int (N));
  70          Write_Str ("  ");
  71          Write_Location (Sloc (N));
  72          Write_Str ("  ");
  73          Write_Str (Node_Kind'Image (Nkind (N)));
  74          Write_Eol;
  75       end if;
  76
  77       Debug_A_Depth := Debug_A_Depth + 1;
  78       Current_Error_Node := N;
  79
  80       if Debug_A_Depth <= Max_Node_Ids then
  81          Node_Ids (Debug_A_Depth) := N;
  82       end if;
  83    end Debug_A_Entry;
  84
  85    ------------------
  86    -- Debug_A_Exit --
  87    ------------------
  88
  89    procedure Debug_A_Exit (S : String; N : Node_Id; Comment : String) is
  90    begin
  91       Debug_A_Depth := Debug_A_Depth - 1;
  92
  93       if Debug_A_Depth in 1 .. Max_Node_Ids then
  94          Current_Error_Node := Node_Ids (Debug_A_Depth);
  95       end if;
  96
  97       if Debug_Flag_A then
  98          Debug_Output_Astring;
  99          Write_Str (S);
 100          Write_Str ("Node_Id = ");
 101          Write_Int (Int (N));
 102          Write_Str (Comment);
 103          Write_Eol;
 104       end if;
 105    end Debug_A_Exit;
 106
 107    --------------------------
 108    -- Debug_Output_Astring --
 109    --------------------------
 110
 111    procedure Debug_Output_Astring is
 112       Vbars : String := "|||||||||||||||||||||||||";
 113       --  Should be constant, removed because of GNAT 1.78 bug ???
 114
 115    begin
 116       if Debug_A_Depth > Vbars'Length then
 117          for I in Vbars'Length .. Debug_A_Depth loop
 118             Write_Char ('|');
 119          end loop;
 120
 121          Write_Str (Vbars);
 122
 123       else
 124          Write_Str (Vbars (1 .. Debug_A_Depth));
 125       end if;
 126    end Debug_Output_Astring;
 127
 128 end Debug_A;