gcc/graph.c

   1 /* Output routines for graphical representation.
   2    Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2007, 2008
   3    Free Software Foundation, Inc.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include <config.h>
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "rtl.h"
  27 #include "flags.h"
  28 #include "output.h"
  29 #include "function.h"
  30 #include "hard-reg-set.h"
  31 #include "obstack.h"
  32 #include "basic-block.h"
  33 #include "diagnostic-core.h"
  34 #include "graph.h"
  35 #include "emit-rtl.h"
  36
  37 static const char *const graph_ext[] =
  38 {
  39   /* no_graph */ "",
  40   /* vcg */      ".vcg",
  41 };
  42
  43 static void start_fct (FILE *);
  44 static void start_bb (FILE *, int);
  45 static void node_data (FILE *, rtx);
  46 static void draw_edge (FILE *, int, int, int, int);
  47 static void end_fct (FILE *);
  48 static void end_bb (FILE *);
  49
  50 /* Output text for new basic block.  */
  51 static void
  52 start_fct (FILE *fp)
  53 {
  54   switch (graph_dump_format)
  55     {
  56     case vcg:
  57       fprintf (fp, "\
  58 graph: { title: \"%s\"\nfolding: 1\nhidden: 2\nnode: { title: \"%s.0\" }\n",
  59                current_function_name (), current_function_name ());
  60       break;
  61     case no_graph:
  62       break;
  63     }
  64 }
  65
  66 static void
  67 start_bb (FILE *fp, int bb)
  68 {
  69 #if 0
  70   reg_set_iterator rsi;
  71 #endif
  72
  73   switch (graph_dump_format)
  74     {
  75     case vcg:
  76       fprintf (fp, "\
  77 graph: {\ntitle: \"%s.BB%d\"\nfolding: 1\ncolor: lightblue\n\
  78 label: \"basic block %d",
  79                current_function_name (), bb, bb);
  80       break;
  81     case no_graph:
  82       break;
  83     }
  84
  85 #if 0
  86   /* FIXME Should this be printed?  It makes the graph significantly larger.  */
  87
  88   /* Print the live-at-start register list.  */
  89   fputc ('\n', fp);
  90   EXECUTE_IF_SET_IN_REG_SET (basic_block_live_at_start[bb], 0, i, rsi)
  91     {
  92       fprintf (fp, " %d", i);
  93       if (i < FIRST_PSEUDO_REGISTER)
  94         fprintf (fp, " [%s]", reg_names[i]);
  95     }
  96 #endif
  97
  98   switch (graph_dump_format)
  99     {
 100     case vcg:
 101       fputs ("\"\n\n", fp);
 102       break;
 103     case no_graph:
 104       break;
 105     }
 106 }
 107
 108 static void
 109 node_data (FILE *fp, rtx tmp_rtx)
 110 {
 111   if (PREV_INSN (tmp_rtx) == 0)
 112     {
 113       /* This is the first instruction.  Add an edge from the starting
 114          block.  */
 115       switch (graph_dump_format)
 116         {
 117         case vcg:
 118           fprintf (fp, "\
 119 edge: { sourcename: \"%s.0\" targetname: \"%s.%d\" }\n",
 120                    current_function_name (),
 121                    current_function_name (), XINT (tmp_rtx, 0));
 122           break;
 123         case no_graph:
 124           break;
 125         }
 126     }
 127
 128   switch (graph_dump_format)
 129     {
 130     case vcg:
 131       fprintf (fp, "node: {\n  title: \"%s.%d\"\n  color: %s\n  \
 132 label: \"%s %d\n",
 133                current_function_name (), XINT (tmp_rtx, 0),
 134                NOTE_P (tmp_rtx) ? "lightgrey"
 135                : NONJUMP_INSN_P (tmp_rtx) ? "green"
 136                : JUMP_P (tmp_rtx) ? "darkgreen"
 137                : CALL_P (tmp_rtx) ? "darkgreen"
 138                : LABEL_P (tmp_rtx) ?  "\
 139 darkgrey\n  shape: ellipse" : "white",
 140                GET_RTX_NAME (GET_CODE (tmp_rtx)), XINT (tmp_rtx, 0));
 141       break;
 142     case no_graph:
 143       break;
 144     }
 145
 146   /* Print the RTL.  */
 147   if (NOTE_P (tmp_rtx))
 148     {
 149       const char *name;
 150       name =  GET_NOTE_INSN_NAME (NOTE_KIND (tmp_rtx));
 151       fprintf (fp, " %s", name);
 152     }
 153   else if (INSN_P (tmp_rtx))
 154     print_rtl_single (fp, PATTERN (tmp_rtx));
 155   else
 156     print_rtl_single (fp, tmp_rtx);
 157
 158   switch (graph_dump_format)
 159     {
 160     case vcg:
 161       fputs ("\"\n}\n", fp);
 162       break;
 163     case no_graph:
 164       break;
 165     }
 166 }
 167
 168 static void
 169 draw_edge (FILE *fp, int from, int to, int bb_edge, int color_class)
 170 {
 171   const char * color;
 172   switch (graph_dump_format)
 173     {
 174     case vcg:
 175       color = "";
 176       if (color_class == 2)
 177         color = "color: red ";
 178       else if (bb_edge)
 179         color = "color: blue ";
 180       else if (color_class == 3)
 181         color = "color: green ";
 182       fprintf (fp,
 183                "edge: { sourcename: \"%s.%d\" targetname: \"%s.%d\" %s",
 184                current_function_name (), from,
 185                current_function_name (), to, color);
 186       if (color_class)
 187         fprintf (fp, "class: %d ", color_class);
 188       fputs ("}\n", fp);
 189       break;
 190     case no_graph:
 191       break;
 192     }
 193 }
 194
 195 static void
 196 end_bb (FILE *fp)
 197 {
 198   switch (graph_dump_format)
 199     {
 200     case vcg:
 201       fputs ("}\n", fp);
 202       break;
 203     case no_graph:
 204       break;
 205     }
 206 }
 207
 208 static void
 209 end_fct (FILE *fp)
 210 {
 211   switch (graph_dump_format)
 212     {
 213     case vcg:
 214       fprintf (fp, "node: { title: \"%s.999999\" label: \"END\" }\n}\n",
 215                current_function_name ());
 216       break;
 217     case no_graph:
 218       break;
 219     }
 220 }
 221 \f
 222 /* Like print_rtl, but also print out live information for the start of each
 223    basic block.  */
 224 void
 225 print_rtl_graph_with_bb (const char *base, rtx rtx_first)
 226 {
 227   rtx tmp_rtx;
 228   size_t namelen = strlen (base);
 229   size_t extlen = strlen (graph_ext[graph_dump_format]) + 1;
 230   char *buf = XALLOCAVEC (char, namelen + extlen);
 231   FILE *fp;
 232
 233   if (basic_block_info == NULL)
 234     return;
 235
 236   memcpy (buf, base, namelen);
 237   memcpy (buf + namelen, graph_ext[graph_dump_format], extlen);
 238
 239   fp = fopen (buf, "a");
 240   if (fp == NULL)
 241     return;
 242
 243   if (rtx_first == 0)
 244     fprintf (fp, "(nil)\n");
 245   else
 246     {
 247       enum bb_state { NOT_IN_BB, IN_ONE_BB, IN_MULTIPLE_BB };
 248       int max_uid = get_max_uid ();
 249       int *start = XNEWVEC (int, max_uid);
 250       int *end = XNEWVEC (int, max_uid);
 251       enum bb_state *in_bb_p = XNEWVEC (enum bb_state, max_uid);
 252       basic_block bb;
 253       int i;
 254
 255       for (i = 0; i < max_uid; ++i)
 256         {
 257           start[i] = end[i] = -1;
 258           in_bb_p[i] = NOT_IN_BB;
 259         }
 260
 261       FOR_EACH_BB_REVERSE (bb)
 262         {
 263           rtx x;
 264           start[INSN_UID (BB_HEAD (bb))] = bb->index;
 265           end[INSN_UID (BB_END (bb))] = bb->index;
 266           for (x = BB_HEAD (bb); x != NULL_RTX; x = NEXT_INSN (x))
 267             {
 268               in_bb_p[INSN_UID (x)]
 269                 = (in_bb_p[INSN_UID (x)] == NOT_IN_BB)
 270                  ? IN_ONE_BB : IN_MULTIPLE_BB;
 271               if (x == BB_END (bb))
 272                 break;
 273             }
 274         }
 275
 276       /* Tell print-rtl that we want graph output.  */
 277       dump_for_graph = 1;
 278
 279       /* Start new function.  */
 280       start_fct (fp);
 281
 282       for (tmp_rtx = NEXT_INSN (rtx_first); NULL != tmp_rtx;
 283            tmp_rtx = NEXT_INSN (tmp_rtx))
 284         {
 285           int edge_printed = 0;
 286           rtx next_insn;
 287
 288           if (start[INSN_UID (tmp_rtx)] < 0 && end[INSN_UID (tmp_rtx)] < 0)
 289             {
 290               if (BARRIER_P (tmp_rtx))
 291                 continue;
 292               if (NOTE_P (tmp_rtx)
 293                   && (1 || in_bb_p[INSN_UID (tmp_rtx)] == NOT_IN_BB))
 294                 continue;
 295             }
 296
 297           if ((i = start[INSN_UID (tmp_rtx)]) >= 0)
 298             {
 299               /* We start a subgraph for each basic block.  */
 300               start_bb (fp, i);
 301
 302               if (i == 0)
 303                 draw_edge (fp, 0, INSN_UID (tmp_rtx), 1, 0);
 304             }
 305
 306           /* Print the data for this node.  */
 307           node_data (fp, tmp_rtx);
 308           next_insn = next_nonnote_insn (tmp_rtx);
 309
 310           if ((i = end[INSN_UID (tmp_rtx)]) >= 0)
 311             {
 312               edge e;
 313               edge_iterator ei;
 314
 315               bb = BASIC_BLOCK (i);
 316
 317               /* End of the basic block.  */
 318               end_bb (fp);
 319
 320               /* Now specify the edges to all the successors of this
 321                  basic block.  */
 322               FOR_EACH_EDGE (e, ei, bb->succs)
 323                 {
 324                   if (e->dest != EXIT_BLOCK_PTR)
 325                     {
 326                       rtx block_head = BB_HEAD (e->dest);
 327
 328                       draw_edge (fp, INSN_UID (tmp_rtx),
 329                                  INSN_UID (block_head),
 330                                  next_insn != block_head,
 331                                  (e->flags & EDGE_ABNORMAL ? 2 : 0));
 332
 333                       if (block_head == next_insn)
 334                         edge_printed = 1;
 335                     }
 336                   else
 337                     {
 338                       draw_edge (fp, INSN_UID (tmp_rtx), 999999,
 339                                  next_insn != 0,
 340                                  (e->flags & EDGE_ABNORMAL ? 2 : 0));
 341
 342                       if (next_insn == 0)
 343                         edge_printed = 1;
 344                     }
 345                 }
 346             }
 347
 348           if (!edge_printed)
 349             {
 350               /* Don't print edges to barriers.  */
 351               if (next_insn == 0
 352                   || !BARRIER_P (next_insn))
 353                 draw_edge (fp, XINT (tmp_rtx, 0),
 354                            next_insn ? INSN_UID (next_insn) : 999999, 0, 0);
 355               else
 356                 {
 357                   /* We draw the remaining edges in class 3.  We have
 358                      to skip over the barrier since these nodes are
 359                      not printed at all.  */
 360                   do
 361                     next_insn = NEXT_INSN (next_insn);
 362                   while (next_insn
 363                          && (NOTE_P (next_insn)
 364                              || BARRIER_P (next_insn)));
 365
 366                   draw_edge (fp, XINT (tmp_rtx, 0),
 367                              next_insn ? INSN_UID (next_insn) : 999999, 0, 3);
 368                 }
 369             }
 370         }
 371
 372       dump_for_graph = 0;
 373
 374       end_fct (fp);
 375
 376       /* Clean up.  */
 377       free (start);
 378       free (end);
 379       free (in_bb_p);
 380     }
 381
 382   fclose (fp);
 383 }
 384
 385
 386 /* Similar as clean_dump_file, but this time for graph output files.  */
 387
 388 void
 389 clean_graph_dump_file (const char *base)
 390 {
 391   size_t namelen = strlen (base);
 392   size_t extlen = strlen (graph_ext[graph_dump_format]) + 1;
 393   char *buf = XALLOCAVEC (char, namelen + extlen);
 394   FILE *fp;
 395
 396   memcpy (buf, base, namelen);
 397   memcpy (buf + namelen, graph_ext[graph_dump_format], extlen);
 398
 399   fp = fopen (buf, "w");
 400
 401   if (fp == NULL)
 402     fatal_error ("can't open %s: %m", buf);
 403
 404   gcc_assert (graph_dump_format == vcg);
 405   fputs ("graph: {\nport_sharing: no\n", fp);
 406
 407   fclose (fp);
 408 }
 409
 410
 411 /* Do final work on the graph output file.  */
 412 void
 413 finish_graph_dump_file (const char *base)
 414 {
 415   size_t namelen = strlen (base);
 416   size_t extlen = strlen (graph_ext[graph_dump_format]) + 1;
 417   char *buf = XALLOCAVEC (char, namelen + extlen);
 418   FILE *fp;
 419
 420   memcpy (buf, base, namelen);
 421   memcpy (buf + namelen, graph_ext[graph_dump_format], extlen);
 422
 423   fp = fopen (buf, "a");
 424   if (fp != NULL)
 425     {
 426       gcc_assert (graph_dump_format == vcg);
 427       fputs ("}\n", fp);
 428       fclose (fp);
 429     }
 430 }