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/* Output routines for graphical representation.

   Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2007, 2008

   Free Software Foundation, Inc.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC is distributed in the hope that it will be useful, but WITHOUT 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

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include <config.h>

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "rtl.h"

#include "flags.h"

#include "output.h"

#include "function.h"

#include "hard-reg-set.h"

#include "obstack.h"

#include "basic-block.h"

#include "toplev.h"

#include "graph.h"

static const char *const graph_ext[] =

{

  /* no_graph */ "",

  /* vcg */      ".vcg",

};

static void start_fct (FILE *);

static void start_bb (FILE *, int);

static void node_data (FILE *, rtx);

static void draw_edge (FILE *, int, int, int, int);

static void end_fct (FILE *);

static void end_bb (FILE *);

/* Output text for new basic block.  */

static void

start_fct (FILE *fp)

{

  switch (graph_dump_format)

    {

    case vcg:

      fprintf (fp, "\

graph: { title: \"%s\"\nfolding: 1\nhidden: 2\nnode: { title: \"%s.0\" }\n",

               current_function_name (), current_function_name ());

      break;

    case no_graph:

      break;

    }

}

static void

start_bb (FILE *fp, int bb)

{

#if 0

  reg_set_iterator rsi;

#endif

  switch (graph_dump_format)

    {

    case vcg:

      fprintf (fp, "\

graph: {\ntitle: \"%s.BB%d\"\nfolding: 1\ncolor: lightblue\n\

label: \"basic block %d",

               current_function_name (), bb, bb);

      break;

    case no_graph:

      break;

    }

#if 0

  /* FIXME Should this be printed?  It makes the graph significantly larger.  */

  /* Print the live-at-start register list.  */

  fputc ('\n', fp);

  EXECUTE_IF_SET_IN_REG_SET (basic_block_live_at_start[bb], 0, i, rsi)

    {

      fprintf (fp, " %d", i);

      if (i < FIRST_PSEUDO_REGISTER)

        fprintf (fp, " [%s]", reg_names[i]);

    }

#endif

  switch (graph_dump_format)

    {

    case vcg:

      fputs ("\"\n\n", fp);

      break;

    case no_graph:

      break;

    }

}

static void

node_data (FILE *fp, rtx tmp_rtx)

{

  if (PREV_INSN (tmp_rtx) == 0)

    {

      /* This is the first instruction.  Add an edge from the starting

         block.  */

      switch (graph_dump_format)

        {

        case vcg:

          fprintf (fp, "\

edge: { sourcename: \"%s.0\" targetname: \"%s.%d\" }\n",

                   current_function_name (),

                   current_function_name (), XINT (tmp_rtx, 0));

          break;

        case no_graph:

          break;

        }

    }

  switch (graph_dump_format)

    {

    case vcg:

      fprintf (fp, "node: {\n  title: \"%s.%d\"\n  color: %s\n  \

label: \"%s %d\n",

               current_function_name (), XINT (tmp_rtx, 0),

               NOTE_P (tmp_rtx) ? "lightgrey"

               : NONJUMP_INSN_P (tmp_rtx) ? "green"

               : JUMP_P (tmp_rtx) ? "darkgreen"

               : CALL_P (tmp_rtx) ? "darkgreen"

               : LABEL_P (tmp_rtx) ?  "\

darkgrey\n  shape: ellipse" : "white",

               GET_RTX_NAME (GET_CODE (tmp_rtx)), XINT (tmp_rtx, 0));

      break;

    case no_graph:

      break;

    }

  /* Print the RTL.  */

  if (NOTE_P (tmp_rtx))

    {

      const char *name;

      name =  GET_NOTE_INSN_NAME (NOTE_KIND (tmp_rtx));

      fprintf (fp, " %s", name);

    }

  else if (INSN_P (tmp_rtx))

    print_rtl_single (fp, PATTERN (tmp_rtx));

  else

    print_rtl_single (fp, tmp_rtx);

  switch (graph_dump_format)

    {

    case vcg:

      fputs ("\"\n}\n", fp);

      break;

    case no_graph:

      break;

    }

}

static void

draw_edge (FILE *fp, int from, int to, int bb_edge, int color_class)

{

  const char * color;

  switch (graph_dump_format)

    {

    case vcg:

      color = "";

      if (color_class == 2)

        color = "color: red ";

      else if (bb_edge)

        color = "color: blue ";

      else if (color_class == 3)

        color = "color: green ";

      fprintf (fp,

               "edge: { sourcename: \"%s.%d\" targetname: \"%s.%d\" %s",

               current_function_name (), from,

               current_function_name (), to, color);

      if (color_class)

        fprintf (fp, "class: %d ", color_class);

      fputs ("}\n", fp);

      break;

    case no_graph:

      break;

    }

}

static void

end_bb (FILE *fp)

{

  switch (graph_dump_format)

    {

    case vcg:

      fputs ("}\n", fp);

      break;

    case no_graph:

      break;

    }

}

static void

end_fct (FILE *fp)

{

  switch (graph_dump_format)

    {

    case vcg:

      fprintf (fp, "node: { title: \"%s.999999\" label: \"END\" }\n}\n",

               current_function_name ());

      break;

    case no_graph:

      break;

    }

}

/* Like print_rtl, but also print out live information for the start of each

   basic block.  */

void

print_rtl_graph_with_bb (const char *base, rtx rtx_first)

{

  rtx tmp_rtx;

  size_t namelen = strlen (base);

  size_t extlen = strlen (graph_ext[graph_dump_format]) + 1;

  char *buf = XALLOCAVEC (char, namelen + extlen);

  FILE *fp;

  if (basic_block_info == NULL)

    return;

  memcpy (buf, base, namelen);

  memcpy (buf + namelen, graph_ext[graph_dump_format], extlen);

  fp = fopen (buf, "a");

  if (fp == NULL)

    return;

  if (rtx_first == 0)

    fprintf (fp, "(nil)\n");

  else

    {

      enum bb_state { NOT_IN_BB, IN_ONE_BB, IN_MULTIPLE_BB };

      int max_uid = get_max_uid ();

      int *start = XNEWVEC (int, max_uid);

      int *end = XNEWVEC (int, max_uid);

      enum bb_state *in_bb_p = XNEWVEC (enum bb_state, max_uid);

      basic_block bb;

      int i;

      for (i = 0; i < max_uid; ++i)

        {

          start[i] = end[i] = -1;

          in_bb_p[i] = NOT_IN_BB;

        }

      FOR_EACH_BB_REVERSE (bb)

        {

          rtx x;

          start[INSN_UID (BB_HEAD (bb))] = bb->index;

          end[INSN_UID (BB_END (bb))] = bb->index;

          for (x = BB_HEAD (bb); x != NULL_RTX; x = NEXT_INSN (x))

            {

              in_bb_p[INSN_UID (x)]

                = (in_bb_p[INSN_UID (x)] == NOT_IN_BB)

                 ? IN_ONE_BB : IN_MULTIPLE_BB;

              if (x == BB_END (bb))

                break;

            }

        }

      /* Tell print-rtl that we want graph output.  */

      dump_for_graph = 1;

      /* Start new function.  */

      start_fct (fp);

      for (tmp_rtx = NEXT_INSN (rtx_first); NULL != tmp_rtx;

           tmp_rtx = NEXT_INSN (tmp_rtx))

        {

          int edge_printed = 0;

          rtx next_insn;

          if (start[INSN_UID (tmp_rtx)] < 0 && end[INSN_UID (tmp_rtx)] < 0)

            {

              if (BARRIER_P (tmp_rtx))

                continue;

              if (NOTE_P (tmp_rtx)

                  && (1 || in_bb_p[INSN_UID (tmp_rtx)] == NOT_IN_BB))

                continue;

            }

          if ((i = start[INSN_UID (tmp_rtx)]) >= 0)

            {

              /* We start a subgraph for each basic block.  */

              start_bb (fp, i);

              if (i == 0)

                draw_edge (fp, 0, INSN_UID (tmp_rtx), 1, 0);

            }

          /* Print the data for this node.  */

          node_data (fp, tmp_rtx);

          next_insn = next_nonnote_insn (tmp_rtx);

          if ((i = end[INSN_UID (tmp_rtx)]) >= 0)

            {

              edge e;

              edge_iterator ei;

              bb = BASIC_BLOCK (i);

              /* End of the basic block.  */

              end_bb (fp);

              /* Now specify the edges to all the successors of this

                 basic block.  */

              FOR_EACH_EDGE (e, ei, bb->succs)

                {

                  if (e->dest != EXIT_BLOCK_PTR)

                    {

                      rtx block_head = BB_HEAD (e->dest);

                      draw_edge (fp, INSN_UID (tmp_rtx),

                                 INSN_UID (block_head),

                                 next_insn != block_head,

                                 (e->flags & EDGE_ABNORMAL ? 2 : 0));

                      if (block_head == next_insn)

                        edge_printed = 1;

                    }

                  else

                    {

                      draw_edge (fp, INSN_UID (tmp_rtx), 999999,

                                 next_insn != 0,

                                 (e->flags & EDGE_ABNORMAL ? 2 : 0));

                      if (next_insn == 0)

                        edge_printed = 1;

                    }

                }

            }

          if (!edge_printed)

            {

              /* Don't print edges to barriers.  */

              if (next_insn == 0

                  || !BARRIER_P (next_insn))

                draw_edge (fp, XINT (tmp_rtx, 0),

                           next_insn ? INSN_UID (next_insn) : 999999, 0, 0);

              else

                {

                  /* We draw the remaining edges in class 3.  We have

                     to skip over the barrier since these nodes are

                     not printed at all.  */

                  do

                    next_insn = NEXT_INSN (next_insn);

                  while (next_insn

                         && (NOTE_P (next_insn)

                             || BARRIER_P (next_insn)));

                  draw_edge (fp, XINT (tmp_rtx, 0),

                             next_insn ? INSN_UID (next_insn) : 999999, 0, 3);

                }

            }

        }

      dump_for_graph = 0;

      end_fct (fp);

      /* Clean up.  */

      free (start);

      free (end);

      free (in_bb_p);

    }

  fclose (fp);

}

/* Similar as clean_dump_file, but this time for graph output files.  */

void

clean_graph_dump_file (const char *base)

{

  size_t namelen = strlen (base);

  size_t extlen = strlen (graph_ext[graph_dump_format]) + 1;

  char *buf = XALLOCAVEC (char, namelen + extlen);

  FILE *fp;

  memcpy (buf, base, namelen);

  memcpy (buf + namelen, graph_ext[graph_dump_format], extlen);

  fp = fopen (buf, "w");

  if (fp == NULL)

    fatal_error ("can't open %s: %m", buf);

  gcc_assert (graph_dump_format == vcg);

  fputs ("graph: {\nport_sharing: no\n", fp);

  fclose (fp);

}

/* Do final work on the graph output file.  */

void

finish_graph_dump_file (const char *base)

{

  size_t namelen = strlen (base);

  size_t extlen = strlen (graph_ext[graph_dump_format]) + 1;

  char *buf = XALLOCAVEC (char, namelen + extlen);

  FILE *fp;

  memcpy (buf, base, namelen);

  memcpy (buf + namelen, graph_ext[graph_dump_format], extlen);

  fp = fopen (buf, "a");

  if (fp != NULL)

    {

      gcc_assert (graph_dump_format == vcg);

      fputs ("}\n", fp);

      fclose (fp);

    }

}