gcc/print-rtl.c

   1 /* Print RTL for GNU C Compiler.
   2    Copyright (C) 1987, 1988, 1992, 1997 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 static int indent;
  51
  52 /* Names for patterns.  Non-zero only when linked with insn-output.c.  */
  53
  54 extern char **insn_name_ptr;
  55
  56 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  57
  58 static void
  59 print_rtx (in_rtx)
  60      register rtx in_rtx;
  61 {
  62   register int i, j;
  63   register char *format_ptr;
  64   register int is_insn;
  65
  66   if (sawclose)
  67     {
  68       fprintf (outfile, "\n%s",
  69                (spaces + (sizeof spaces - 1 - indent * 2)));
  70       sawclose = 0;
  71     }
  72
  73   if (in_rtx == 0)
  74     {
  75       fprintf (outfile, "(nil)");
  76       sawclose = 1;
  77       return;
  78     }
  79
  80   /* print name of expression code */
  81   fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
  82
  83   if (in_rtx->in_struct)
  84     fprintf (outfile, "/s");
  85
  86   if (in_rtx->volatil)
  87     fprintf (outfile, "/v");
  88
  89   if (in_rtx->unchanging)
  90     fprintf (outfile, "/u");
  91
  92   if (in_rtx->integrated)
  93     fprintf (outfile, "/i");
  94
  95   if (GET_MODE (in_rtx) != VOIDmode)
  96     {
  97       /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
  98       if (GET_CODE (in_rtx) == EXPR_LIST || GET_CODE (in_rtx) == INSN_LIST)
  99         fprintf (outfile, ":%s", GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 100       else
 101         fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 102     }
 103
 104   is_insn = (GET_RTX_CLASS (GET_CODE (in_rtx)) == 'i');
 105   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx));
 106
 107   for (i = 0; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 108     switch (*format_ptr++)
 109       {
 110       case 'S':
 111       case 's':
 112         if (i == 3 && GET_CODE (in_rtx) == NOTE
 113             && (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_EH_REGION_BEG
 114                 || NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_EH_REGION_END))
 115           {
 116             fprintf (outfile, " %d", NOTE_BLOCK_NUMBER (in_rtx));
 117             sawclose = 1;
 118             break;
 119           }
 120         if (XSTR (in_rtx, i) == 0)
 121           fprintf (outfile, " \"\"");
 122         else
 123           fprintf (outfile, " (\"%s\")", XSTR (in_rtx, i));
 124         sawclose = 1;
 125         break;
 126
 127         /* 0 indicates a field for internal use that should not be printed.  */
 128       case '0':
 129         break;
 130
 131       case 'e':
 132         indent += 2;
 133         if (!sawclose)
 134           fprintf (outfile, " ");
 135         print_rtx (XEXP (in_rtx, i));
 136         indent -= 2;
 137         break;
 138
 139       case 'E':
 140       case 'V':
 141         indent += 2;
 142         if (sawclose)
 143           {
 144             fprintf (outfile, "\n%s",
 145                      (spaces + (sizeof spaces - 1 - indent * 2)));
 146             sawclose = 0;
 147           }
 148         fprintf (outfile, "[ ");
 149         if (NULL != XVEC (in_rtx, i))
 150           {
 151             indent += 2;
 152             if (XVECLEN (in_rtx, i))
 153               sawclose = 1;
 154
 155             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 156               print_rtx (XVECEXP (in_rtx, i, j));
 157
 158             indent -= 2;
 159           }
 160         if (sawclose)
 161           fprintf (outfile, "\n%s",
 162                    (spaces + (sizeof spaces - 1 - indent * 2)));
 163
 164         fprintf (outfile, "] ");
 165         sawclose = 1;
 166         indent -= 2;
 167         break;
 168
 169       case 'w':
 170         fprintf (outfile, " ");
 171         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 172         break;
 173
 174       case 'i':
 175         {
 176           register int value = XINT (in_rtx, i);
 177
 178           if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 179             {
 180               fputc (' ', outfile);
 181               DEBUG_PRINT_REG (in_rtx, 0, outfile);
 182             }
 183           else
 184             fprintf (outfile, " %d", value);
 185         }
 186         if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 187             && insn_name_ptr
 188             && XINT (in_rtx, i) >= 0)
 189           fprintf (outfile, " {%s}", insn_name_ptr[XINT (in_rtx, i)]);
 190         sawclose = 0;
 191         break;
 192
 193       /* Print NOTE_INSN names rather than integer codes.  */
 194
 195       case 'n':
 196         if (XINT (in_rtx, i) <= 0)
 197           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 198         else
 199           fprintf (outfile, " %d", XINT (in_rtx, i));
 200         sawclose = 0;
 201         break;
 202
 203       case 'u':
 204         if (XEXP (in_rtx, i) != NULL)
 205           fprintf (outfile, " %d", INSN_UID (XEXP (in_rtx, i)));
 206         else
 207           fprintf (outfile, " 0");
 208         sawclose = 0;
 209         break;
 210
 211       case '*':
 212         fprintf (outfile, " Unknown");
 213         sawclose = 0;
 214         break;
 215
 216       default:
 217         fprintf (stderr,
 218                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 219                  format_ptr[-1]);
 220         abort ();
 221       }
 222
 223   fprintf (outfile, ")");
 224   sawclose = 1;
 225 }
 226
 227 /* Print an rtx on the current line of FILE.  Initially indent IND
 228    characters.  */
 229
 230 void
 231 print_inline_rtx (outf, x, ind)
 232      FILE *outf;
 233      rtx x;
 234 {
 235   sawclose = 0;
 236   indent = ind;
 237   outfile = outf;
 238   print_rtx (x);
 239 }
 240
 241 /* Call this function from the debugger to see what X looks like.  */
 242
 243 void
 244 debug_rtx (x)
 245      rtx x;
 246 {
 247   outfile = stderr;
 248   print_rtx (x);
 249   fprintf (stderr, "\n");
 250 }
 251
 252 /* Count of rtx's to print with debug_rtx_list.
 253    This global exists because gdb user defined commands have no arguments.  */
 254
 255 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 256
 257 /* Call this function to print list from X on.
 258
 259    N is a count of the rtx's to print. Positive values print from the specified
 260    rtx on.  Negative values print a window around the rtx.
 261    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 262
 263 void
 264 debug_rtx_list (x, n)
 265      rtx x;
 266      int n;
 267 {
 268   int i,count;
 269   rtx insn;
 270
 271   count = n == 0 ? 1 : n < 0 ? -n : n;
 272
 273   /* If we are printing a window, back up to the start.  */
 274
 275   if (n < 0)
 276     for (i = count / 2; i > 0; i--)
 277       {
 278         if (PREV_INSN (x) == 0)
 279           break;
 280         x = PREV_INSN (x);
 281       }
 282
 283   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 284     debug_rtx (insn);
 285 }
 286
 287 /* Call this function to search an rtx list to find one with insn uid UID,
 288    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 289    The found insn is returned to enable further debugging analysis.  */
 290
 291 rtx
 292 debug_rtx_find (x, uid)
 293      rtx x;
 294      int uid;
 295 {
 296   while (x != 0 && INSN_UID (x) != uid)
 297     x = NEXT_INSN (x);
 298   if (x != 0)
 299     {
 300       debug_rtx_list (x, debug_rtx_count);
 301       return x;
 302     }
 303   else
 304     {
 305       fprintf (stderr, "insn uid %d not found\n", uid);
 306       return 0;
 307     }
 308 }
 309
 310 /* External entry point for printing a chain of insns
 311    starting with RTX_FIRST onto file OUTF.
 312    A blank line separates insns.
 313
 314    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 315
 316 void
 317 print_rtl (outf, rtx_first)
 318      FILE *outf;
 319      rtx rtx_first;
 320 {
 321   register rtx tmp_rtx;
 322
 323   outfile = outf;
 324   sawclose = 0;
 325
 326   if (rtx_first == 0)
 327     fprintf (outf, "(nil)\n");
 328   else
 329     switch (GET_CODE (rtx_first))
 330       {
 331       case INSN:
 332       case JUMP_INSN:
 333       case CALL_INSN:
 334       case NOTE:
 335       case CODE_LABEL:
 336       case BARRIER:
 337         for (tmp_rtx = rtx_first; NULL != tmp_rtx; tmp_rtx = NEXT_INSN (tmp_rtx))
 338           {
 339             print_rtx (tmp_rtx);
 340             fprintf (outfile, "\n");
 341           }
 342         break;
 343
 344       default:
 345         print_rtx (rtx_first);
 346       }
 347 }