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 --          Copyright (C) 1992-2002 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 with Atree;   use Atree;
  28 with Debug;   use Debug;
  29 with Sinfo;   use Sinfo;
  30 with Sinput;  use Sinput;
  31 with Output;  use Output;
  32
  33 package body Debug_A is
  34
  35    Debug_A_Depth : Natural := 0;
  36    --  Output for the debug A flag is preceded by a sequence of vertical bar
  37    --  characters corresponding to the recursion depth of the actions being
  38    --  recorded (analysis, expansion, resolution and evaluation of nodes)
  39    --  This variable records the depth.
  40
  41    Max_Node_Ids : constant := 200;
  42    --  Maximum number of Node_Id values that get stacked
  43
  44    Node_Ids : array (1 .. Max_Node_Ids) of Node_Id;
  45    --  A stack used to keep track of Node_Id values for setting the value of
  46    --  Current_Error_Node correctly. Note that if we have more than 200
  47    --  recursion levels, we just don't reset the right value on exit, which
  48    --  is not crucial, since this is only for debugging!
  49
  50    -----------------------
  51    -- Local Subprograms --
  52    -----------------------
  53
  54    procedure Debug_Output_Astring;
  55    --  Outputs Debug_A_Depth number of vertical bars, used to preface messages
  56
  57    -------------------
  58    -- Debug_A_Entry --
  59    -------------------
  60
  61    procedure Debug_A_Entry (S : String; N : Node_Id) is
  62    begin
  63       --  Output debugging information if -gnatda flag set
  64
  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       --  Now push the new element
  78
  79       Debug_A_Depth := Debug_A_Depth + 1;
  80
  81       if Debug_A_Depth <= Max_Node_Ids then
  82          Node_Ids (Debug_A_Depth) := N;
  83       end if;
  84
  85       --  Set Current_Error_Node only if the new node has a decent Sloc
  86       --  value, since it is for the Sloc value that we set this anyway.
  87       --  If we don't have a decent Sloc value, we leave it unchanged.
  88
  89       if Sloc (N) > No_Location then
  90          Current_Error_Node := N;
  91       end if;
  92    end Debug_A_Entry;
  93
  94    ------------------
  95    -- Debug_A_Exit --
  96    ------------------
  97
  98    procedure Debug_A_Exit (S : String; N : Node_Id; Comment : String) is
  99    begin
 100       Debug_A_Depth := Debug_A_Depth - 1;
 101
 102       --  We look down the stack to find something with a decent Sloc. (If
 103       --  we find nothing, just leave it unchanged which is not so terrible)
 104
 105       for J in reverse 1 .. Integer'Min (Max_Node_Ids, Debug_A_Depth) loop
 106          if Sloc (Node_Ids (J)) > No_Location then
 107             Current_Error_Node := Node_Ids (J);
 108             exit;
 109          end if;
 110       end loop;
 111
 112       --  Output debugging information if -gnatda flag set
 113
 114       if Debug_Flag_A then
 115          Debug_Output_Astring;
 116          Write_Str (S);
 117          Write_Str ("Node_Id = ");
 118          Write_Int (Int (N));
 119          Write_Str (Comment);
 120          Write_Eol;
 121       end if;
 122    end Debug_A_Exit;
 123
 124    --------------------------
 125    -- Debug_Output_Astring --
 126    --------------------------
 127
 128    procedure Debug_Output_Astring is
 129       Vbars : constant String := "|||||||||||||||||||||||||";
 130       --  Should be constant, removed because of GNAT 1.78 bug ???
 131
 132    begin
 133       if Debug_A_Depth > Vbars'Length then
 134          for I in Vbars'Length .. Debug_A_Depth loop
 135             Write_Char ('|');
 136          end loop;
 137
 138          Write_Str (Vbars);
 139
 140       else
 141          Write_Str (Vbars (1 .. Debug_A_Depth));
 142       end if;
 143    end Debug_Output_Astring;
 144
 145 end Debug_A;