gcc/print-rtl.c

   1 /* Print RTL for GNU C Compiler.
   2    Copyright (C) 1987, 1988, 1992 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include "config.h"
  23 #include <ctype.h>
  24 #include <stdio.h>
  25 #include "rtl.h"
  26
  27
  28 /* How to print out a register name.
  29    We don't use PRINT_REG because some definitions of PRINT_REG
  30    don't work here.  */
  31 #ifndef DEBUG_PRINT_REG
  32 #define DEBUG_PRINT_REG(RTX, CODE, FILE) \
  33   fprintf ((FILE), "%d %s", REGNO (RTX), reg_names[REGNO (RTX)])
  34 #endif
  35
  36 /* Array containing all of the register names */
  37
  38 #ifdef DEBUG_REGISTER_NAMES
  39 static char *reg_names[] = DEBUG_REGISTER_NAMES;
  40 #else
  41 static char *reg_names[] = REGISTER_NAMES;
  42 #endif
  43
  44 static FILE *outfile;
  45
  46 char spaces[] = "                                                                                                                                                                ";
  47
  48 static int sawclose = 0;
  49
  50 /* Names for patterns.  Non-zero only when linked with insn-output.c.  */
  51
  52 extern char **insn_name_ptr;
  53
  54 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  55
  56 static void
  57 print_rtx (in_rtx)
  58      register rtx in_rtx;
  59 {
  60   static int indent;
  61   register int i, j;
  62   register char *format_ptr;
  63   register int is_insn;
  64
  65   if (sawclose)
  66     {
  67       fprintf (outfile, "\n%s",
  68                (spaces + (sizeof spaces - 1 - indent * 2)));
  69       sawclose = 0;
  70     }
  71
  72   if (in_rtx == 0)
  73     {
  74       fprintf (outfile, "(nil)");
  75       sawclose = 1;
  76       return;
  77     }
  78
  79   /* print name of expression code */
  80   fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
  81
  82   if (in_rtx->in_struct)
  83     fprintf (outfile, "/s");
  84
  85   if (in_rtx->volatil)
  86     fprintf (outfile, "/v");
  87
  88   if (in_rtx->unchanging)
  89     fprintf (outfile, "/u");
  90
  91   if (in_rtx->integrated)
  92     fprintf (outfile, "/i");
  93
  94   if (GET_MODE (in_rtx) != VOIDmode)
  95     {
  96       /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
  97       if (GET_CODE (in_rtx) == EXPR_LIST || GET_CODE (in_rtx) == INSN_LIST)
  98         fprintf (outfile, ":%s", GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
  99       else
 100         fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 101     }
 102
 103   is_insn = (GET_RTX_CLASS (GET_CODE (in_rtx)) == 'i');
 104   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx));
 105
 106   for (i = 0; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 107     switch (*format_ptr++)
 108       {
 109       case 'S':
 110       case 's':
 111         if (XSTR (in_rtx, i) == 0)
 112           fprintf (outfile, " \"\"");
 113         else
 114           fprintf (outfile, " (\"%s\")", XSTR (in_rtx, i));
 115         sawclose = 1;
 116         break;
 117
 118         /* 0 indicates a field for internal use that should not be printed.  */
 119       case '0':
 120         break;
 121
 122       case 'e':
 123         indent += 2;
 124         if (!sawclose)
 125           fprintf (outfile, " ");
 126         print_rtx (XEXP (in_rtx, i));
 127         indent -= 2;
 128         break;
 129
 130       case 'E':
 131       case 'V':
 132         indent += 2;
 133         if (sawclose)
 134           {
 135             fprintf (outfile, "\n%s",
 136                      (spaces + (sizeof spaces - 1 - indent * 2)));
 137             sawclose = 0;
 138           }
 139         fprintf (outfile, "[ ");
 140         if (NULL != XVEC (in_rtx, i))
 141           {
 142             indent += 2;
 143             if (XVECLEN (in_rtx, i))
 144               sawclose = 1;
 145
 146             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 147               print_rtx (XVECEXP (in_rtx, i, j));
 148
 149             indent -= 2;
 150           }
 151         if (sawclose)
 152           fprintf (outfile, "\n%s",
 153                    (spaces + (sizeof spaces - 1 - indent * 2)));
 154
 155         fprintf (outfile, "] ");
 156         sawclose = 1;
 157         indent -= 2;
 158         break;
 159
 160       case 'w':
 161         fprintf (outfile,
 162 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
 163                  " %d",
 164 #else
 165                  " %ld",
 166 #endif
 167                  XWINT (in_rtx, i));
 168         break;
 169
 170       case 'i':
 171         {
 172           register int value = XINT (in_rtx, i);
 173
 174           if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 175             {
 176               fputc (' ', outfile);
 177               DEBUG_PRINT_REG (in_rtx, 0, outfile);
 178             }
 179           else
 180             fprintf (outfile, " %d", value);
 181         }
 182         if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 183             && insn_name_ptr
 184             && XINT (in_rtx, i) >= 0)
 185           fprintf (outfile, " {%s}", insn_name_ptr[XINT (in_rtx, i)]);
 186         sawclose = 0;
 187         break;
 188
 189       /* Print NOTE_INSN names rather than integer codes.  */
 190
 191       case 'n':
 192         if (XINT (in_rtx, i) <= 0)
 193           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 194         else
 195           fprintf (outfile, " %d", XINT (in_rtx, i));
 196         sawclose = 0;
 197         break;
 198
 199       case 'u':
 200         if (XEXP (in_rtx, i) != NULL)
 201           fprintf (outfile, " %d", INSN_UID (XEXP (in_rtx, i)));
 202         else
 203           fprintf (outfile, " 0");
 204         sawclose = 0;
 205         break;
 206
 207       case '*':
 208         fprintf (outfile, " Unknown");
 209         sawclose = 0;
 210         break;
 211
 212       default:
 213         fprintf (stderr,
 214                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 215                  format_ptr[-1]);
 216         abort ();
 217       }
 218
 219   fprintf (outfile, ")");
 220   sawclose = 1;
 221 }
 222
 223 /* Call this function from the debugger to see what X looks like.  */
 224
 225 void
 226 debug_rtx (x)
 227      rtx x;
 228 {
 229   outfile = stderr;
 230   print_rtx (x);
 231   fprintf (stderr, "\n");
 232 }
 233
 234 /* Count of rtx's to print with debug_rtx_list.
 235    This global exists because gdb user defined commands have no arguments.  */
 236
 237 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 238
 239 /* Call this function to print list from X on.
 240
 241    N is a count of the rtx's to print. Positive values print from the specified
 242    rtx on.  Negative values print a window around the rtx.
 243    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 244
 245 void
 246 debug_rtx_list (x, n)
 247      rtx x;
 248      int n;
 249 {
 250   int i,count;
 251   rtx insn;
 252
 253   count = n == 0 ? 1 : n < 0 ? -n : n;
 254
 255   /* If we are printing a window, back up to the start.  */
 256
 257   if (n < 0)
 258     for (i = count / 2; i > 0; i--)
 259       {
 260         if (PREV_INSN (x) == 0)
 261           break;
 262         x = PREV_INSN (x);
 263       }
 264
 265   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 266     debug_rtx (insn);
 267 }
 268
 269 /* Call this function to search an rtx list to find one with insn uid UID,
 270    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 271    The found insn is returned to enable further debugging analysis.  */
 272
 273 rtx
 274 debug_rtx_find(x, uid)
 275      rtx x;
 276      int uid;
 277 {
 278   while (x != 0 && INSN_UID (x) != uid)
 279     x = NEXT_INSN (x);
 280   if (x != 0)
 281     {
 282       debug_rtx_list (x, debug_rtx_count);
 283       return x;
 284     }
 285   else
 286     {
 287       fprintf (stderr, "insn uid %d not found\n", uid);
 288       return 0;
 289     }
 290 }
 291
 292 /* External entry point for printing a chain of insns
 293    starting with RTX_FIRST onto file OUTF.
 294    A blank line separates insns.
 295
 296    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 297
 298 void
 299 print_rtl (outf, rtx_first)
 300      FILE *outf;
 301      rtx rtx_first;
 302 {
 303   register rtx tmp_rtx;
 304
 305   outfile = outf;
 306   sawclose = 0;
 307
 308   if (rtx_first == 0)
 309     fprintf (outf, "(nil)\n");
 310   else
 311     switch (GET_CODE (rtx_first))
 312       {
 313       case INSN:
 314       case JUMP_INSN:
 315       case CALL_INSN:
 316       case NOTE:
 317       case CODE_LABEL:
 318       case BARRIER:
 319         for (tmp_rtx = rtx_first; NULL != tmp_rtx; tmp_rtx = NEXT_INSN (tmp_rtx))
 320           {
 321             print_rtx (tmp_rtx);
 322             fprintf (outfile, "\n");
 323           }
 324         break;
 325
 326       default:
 327         print_rtx (rtx_first);
 328       }
 329 }