print-rtl.c   [plain text]

/* Print RTL for GNU C Compiler.
   Copyright (C) 1987, 1988, 1992, 1997, 1998, 1999, 2000, 2002, 2003
   Free Software Foundation, Inc.

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 2, 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 COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */


#include "config.h"
#include "system.h"
#include "rtl.h"

/* We don't want the tree code checking code for the access to the
   DECL_NAME to be included in the gen* programs.  */
#undef ENABLE_TREE_CHECKING
#include "tree.h"
#include "real.h"
#include "flags.h"
#include "hard-reg-set.h"
#include "basic-block.h"

/* How to print out a register name.
   We don't use PRINT_REG because some definitions of PRINT_REG
   don't work here.  */
#ifndef DEBUG_PRINT_REG
#define DEBUG_PRINT_REG(RTX, CODE, FILE) \
  fprintf ((FILE), "%d %s", REGNO (RTX), reg_names[REGNO (RTX)])
#endif

/* Array containing all of the register names */

#ifdef DEBUG_REGISTER_NAMES
static const char * const debug_reg_names[] = DEBUG_REGISTER_NAMES;
#define reg_names debug_reg_names
#else
const char * reg_names[] = REGISTER_NAMES;
#endif

static FILE *outfile;

static int sawclose = 0;

static int indent;

static void print_rtx		PARAMS ((rtx));

/* String printed at beginning of each RTL when it is dumped.
   This string is set to ASM_COMMENT_START when the RTL is dumped in
   the assembly output file.  */
const char *print_rtx_head = "";

/* Nonzero means suppress output of instruction numbers and line number
   notes in debugging dumps.
   This must be defined here so that programs like gencodes can be linked.  */
int flag_dump_unnumbered = 0;

/* Nonzero means use simplified format without flags, modes, etc.  */
int flag_simple = 0;

/* Nonzero if we are dumping graphical description.  */
int dump_for_graph;

/* Nonzero to dump all call_placeholder alternatives.  */
static int debug_call_placeholder_verbose;

void
print_mem_expr (outfile, expr)
     FILE *outfile;
     tree expr;
{
  if (TREE_CODE (expr) == COMPONENT_REF)
    {
      if (TREE_OPERAND (expr, 0))
	print_mem_expr (outfile, TREE_OPERAND (expr, 0));
      else
	fputs (" <variable>", outfile);
      if (DECL_NAME (TREE_OPERAND (expr, 1)))
	fprintf (outfile, ".%s",
		 IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (expr, 1))));
    }
  else if (TREE_CODE (expr) == INDIRECT_REF)
    {
      fputs (" (*", outfile);
      print_mem_expr (outfile, TREE_OPERAND (expr, 0));
      fputs (")", outfile);
    }
  else if (DECL_NAME (expr))
    fprintf (outfile, " %s", IDENTIFIER_POINTER (DECL_NAME (expr)));
  else if (TREE_CODE (expr) == RESULT_DECL)
    fputs (" <result>", outfile);
  else
    fputs (" <anonymous>", outfile);
}

/* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */

static void
print_rtx (in_rtx)
     rtx in_rtx;
{
  int i = 0;
  int j;
  const char *format_ptr;
  int is_insn;
  rtx tem;

  if (sawclose)
    {
      if (flag_simple)
	fputc (' ', outfile);
      else
	fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
      sawclose = 0;
    }

  if (in_rtx == 0)
    {
      fputs ("(nil)", outfile);
      sawclose = 1;
      return;
    }
  else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
    {
       fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
       sawclose = 1;
       return;
    }

  is_insn = INSN_P (in_rtx);

  /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
     in separate nodes and therefore have to handle them special here.  */
  if (dump_for_graph
      && (is_insn || GET_CODE (in_rtx) == NOTE
	  || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
    {
      i = 3;
      indent = 0;
    }
  else
    {
      /* Print name of expression code.  */
      if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
	fputc ('(', outfile);
      else
	fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));

      if (! flag_simple)
	{
	  if (RTX_FLAG (in_rtx, in_struct))
	    fputs ("/s", outfile);

	  if (RTX_FLAG (in_rtx, volatil))
	    fputs ("/v", outfile);

	  if (RTX_FLAG (in_rtx, unchanging))
	    fputs ("/u", outfile);

	  if (RTX_FLAG (in_rtx, integrated))
	    fputs ("/i", outfile);

	  if (RTX_FLAG (in_rtx, frame_related))
	    fputs ("/f", outfile);

	  if (RTX_FLAG (in_rtx, jump))
	    fputs ("/j", outfile);

	  if (RTX_FLAG (in_rtx, call))
	    fputs ("/c", outfile);

	  if (GET_MODE (in_rtx) != VOIDmode)
	    {
	      /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
	      if (GET_CODE (in_rtx) == EXPR_LIST
		  || GET_CODE (in_rtx) == INSN_LIST)
		fprintf (outfile, ":%s",
			 GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
	      else
		fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
	    }
	}
    }

#ifndef GENERATOR_FILE
  if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
    i = 5;
#endif

  /* Get the format string and skip the first elements if we have handled
     them already.  */
  format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
  for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
    switch (*format_ptr++)
      {
	const char *str;

      case 'T':
	str = XTMPL (in_rtx, i);
	goto string;

      case 'S':
      case 's':
	str = XSTR (in_rtx, i);
      string:

	if (str == 0)
	  fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
	else
	  {
	    if (dump_for_graph)
	      fprintf (outfile, " (\\\"%s\\\")", str);
	    else
	      fprintf (outfile, " (\"%s\")", str);
	  }
	sawclose = 1;
	break;

	/* 0 indicates a field for internal use that should not be printed.
	   An exception is the third field of a NOTE, where it indicates
	   that the field has several different valid contents.  */
      case '0':
	if (i == 1 && GET_CODE (in_rtx) == REG)
	  {
	    if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
	      fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
	    break;
	  }
	if (i == 4 && GET_CODE (in_rtx) == NOTE)
	  {
	    switch (NOTE_LINE_NUMBER (in_rtx))
	      {
	      case NOTE_INSN_EH_REGION_BEG:
	      case NOTE_INSN_EH_REGION_END:
		if (flag_dump_unnumbered)
		  fprintf (outfile, " #");
		else
		  fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
		sawclose = 1;
		break;

	      case NOTE_INSN_BLOCK_BEG:
	      case NOTE_INSN_BLOCK_END:
		fprintf (outfile, " ");
		if (flag_dump_unnumbered)
		  fprintf (outfile, "#");
		else
		  fprintf (outfile, HOST_PTR_PRINTF,
			   (char *) NOTE_BLOCK (in_rtx));
		sawclose = 1;
		break;

	      case NOTE_INSN_BASIC_BLOCK:
		{
		  basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
		  if (bb != 0)
		    fprintf (outfile, " [bb %d]", bb->index);
		  break;
	        }

	      case NOTE_INSN_EXPECTED_VALUE:
		indent += 2;
		if (!sawclose)
		  fprintf (outfile, " ");
		print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
		indent -= 2;
		break;

	      case NOTE_INSN_DELETED_LABEL:
		if (NOTE_SOURCE_FILE (in_rtx))
		  fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
		else
		  fprintf (outfile, " \"\"");
		break;

	      case NOTE_INSN_PREDICTION:
		if (NOTE_PREDICTION (in_rtx))
		  fprintf (outfile, " [ %d %d ] ",
			   (int)NOTE_PREDICTION_ALG (in_rtx),
			   (int) NOTE_PREDICTION_FLAGS (in_rtx));
		else
		  fprintf (outfile, " [ ERROR ]");
		break;

		/* APPLE LOCAL begin - rarely executed bb optimization */

	      case NOTE_INSN_DONT_SHORTEN_BRANCH:
	      case NOTE_INSN_UNLIKELY_EXECUTED_CODE:
		{
		  basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
		  if (bb != 0)
		    fprintf (outfile, " [bb %d]", bb->index);
		  break;
		
		/* APPLE LOCAL end - rarely executed bb optimization */
		}

	      /* APPLE LOCAL new feedback */
	      case NOTE_INSN_FDO_COUNT_INCOMING:
	      case NOTE_INSN_FDO_COUNT_OUTGOING:
	      case NOTE_INSN_FDO_COUNT_BLOCK:
		fprintf (outfile, " [");
#if 0
		/* FIXME: We can't easily do this because print-rtl.c
		   is used by the genxxx programs, which don't
		   include feedback.o, and the
		   endianness may be different between host
		   and target, which screws up the dump.
		   Settle for printing the halves separately
		   for now.  Result may be endian dependent. */
		fprintf (outfile, HOST_WIDEST_INT_PRINT_DEC, 
		    get_fdo_note_count (in_rtx));
#endif
		fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, 
		    NOTE_FDO_COUNT_HIGH (in_rtx));
		fprintf (outfile, "/");
		fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, 
		    NOTE_FDO_COUNT (in_rtx));
		fprintf (outfile, "]");
		break;

	      case NOTE_INSN_FDO_COUNT_TABLEJUMP:
		fputs (" [", outfile);
		if (NULL != NOTE_FDO_TABLEJUMP (in_rtx))
		  {
		    indent += 2;
		    if (XVECLEN (in_rtx, 4))
		      sawclose = 1;

		    for (j = 0; j < XVECLEN (in_rtx, 4); j++)
		      print_rtx (XVECEXP (in_rtx, 4, j));

		    indent -= 2;
		  }
		fputs (" ]", outfile);
		break;

	      default:
		{
		  const char * const str = X0STR (in_rtx, i);

		  if (NOTE_LINE_NUMBER (in_rtx) < 0)
		    ;
		  else if (str == 0)
		    fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
		  else
		    {
		      if (dump_for_graph)
		        fprintf (outfile, " (\\\"%s\\\")", str);
		      else
		        fprintf (outfile, " (\"%s\")", str);
		    }
		  break;
		}
	      }
	  }
	break;

      case 'e':
      do_e:
	indent += 2;
	if (!sawclose)
	  fprintf (outfile, " ");
	print_rtx (XEXP (in_rtx, i));
	indent -= 2;
	break;

      case 'E':
      case 'V':
	indent += 2;
	if (sawclose)
	  {
	    fprintf (outfile, "\n%s%*s",
		     print_rtx_head, indent * 2, "");
	    sawclose = 0;
	  }
	fputs (" [", outfile);
	if (NULL != XVEC (in_rtx, i))
	  {
	    indent += 2;
	    if (XVECLEN (in_rtx, i))
	      sawclose = 1;

	    for (j = 0; j < XVECLEN (in_rtx, i); j++)
	      print_rtx (XVECEXP (in_rtx, i, j));

	    indent -= 2;
	  }
	if (sawclose)
	  fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");

	fputs ("]", outfile);
	sawclose = 1;
	indent -= 2;
	break;

      case 'w':
	if (! flag_simple)
	  fprintf (outfile, " ");
	fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
	if (! flag_simple)
	  {
	    fprintf (outfile, " [");
	    fprintf (outfile, HOST_WIDE_INT_PRINT_HEX, XWINT (in_rtx, i));
	    fprintf (outfile, "]");
	  }
	break;

      case 'i':
	if (i == 6 && GET_CODE (in_rtx) == NOTE)
	  {
	    /* This field is only used for NOTE_INSN_DELETED_LABEL, and
	       other times often contains garbage from INSN->NOTE death.  */
	    if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
	      fprintf (outfile, " %d",  XINT (in_rtx, i));
	  }
	else
	  {
	    int value = XINT (in_rtx, i);
	    const char *name;

	    if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
	      {
		fputc (' ', outfile);
		DEBUG_PRINT_REG (in_rtx, 0, outfile);
	      }
	    else if (GET_CODE (in_rtx) == REG
		     && value <= LAST_VIRTUAL_REGISTER)
	      {
		if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
		  fprintf (outfile, " %d virtual-incoming-args", value);
		else if (value == VIRTUAL_STACK_VARS_REGNUM)
		  fprintf (outfile, " %d virtual-stack-vars", value);
		else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
		  fprintf (outfile, " %d virtual-stack-dynamic", value);
		else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
		  fprintf (outfile, " %d virtual-outgoing-args", value);
		else if (value == VIRTUAL_CFA_REGNUM)
		  fprintf (outfile, " %d virtual-cfa", value);
		else
		  fprintf (outfile, " %d virtual-reg-%d", value,
			   value-FIRST_VIRTUAL_REGISTER);
	      }
	    else if (flag_dump_unnumbered
		     && (is_insn || GET_CODE (in_rtx) == NOTE))
	      fputc ('#', outfile);
	    else
	      fprintf (outfile, " %d", value);

	    if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
		&& XINT (in_rtx, i) >= 0
		&& (name = get_insn_name (XINT (in_rtx, i))) != NULL)
	      fprintf (outfile, " {%s}", name);
	    sawclose = 0;
	  }
	break;

      /* Print NOTE_INSN names rather than integer codes.  */

      case 'n':
	if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
	    && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
	  fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
	else
	  fprintf (outfile, " %d", XINT (in_rtx, i));
	sawclose = 0;
	break;

      case 'u':
	if (XEXP (in_rtx, i) != NULL)
	  {
	    rtx sub = XEXP (in_rtx, i);
	    enum rtx_code subc = GET_CODE (sub);

	    if (GET_CODE (in_rtx) == LABEL_REF)
	      {
		if (subc == NOTE
		    && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
		  {
		    if (flag_dump_unnumbered)
		      fprintf (outfile, " [# deleted]");
		    else
		      fprintf (outfile, " [%d deleted]", INSN_UID (sub));
		    sawclose = 0;
		    break;
		  }

		if (subc != CODE_LABEL)
		  goto do_e;
	      }

	    if (flag_dump_unnumbered)
	      fputs (" #", outfile);
	    else
	      fprintf (outfile, " %d", INSN_UID (sub));
	  }
	else
	  fputs (" 0", outfile);
	sawclose = 0;
	break;

      case 'b':
	if (XBITMAP (in_rtx, i) == NULL)
	  fputs (" {null}", outfile);
	else
	  bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
	sawclose = 0;
	break;

      case 't':
	putc (' ', outfile);
	fprintf (outfile, HOST_PTR_PRINTF, (char *) XTREE (in_rtx, i));
	break;

      case '*':
	fputs (" Unknown", outfile);
	sawclose = 0;
	break;

      case 'B':
	if (XBBDEF (in_rtx, i))
	  fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
	break;

      default:
	fprintf (stderr,
		 "switch format wrong in rtl.print_rtx(). format was: %c.\n",
		 format_ptr[-1]);
	abort ();
      }

  switch (GET_CODE (in_rtx))
    {
#ifndef GENERATOR_FILE
    case MEM:
      fputs (" [", outfile);
      fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));

      if (MEM_EXPR (in_rtx))
	print_mem_expr (outfile, MEM_EXPR (in_rtx));

      if (MEM_OFFSET (in_rtx))
	{
	  fputc ('+', outfile);
	  fprintf (outfile, HOST_WIDE_INT_PRINT_DEC,
		   INTVAL (MEM_OFFSET (in_rtx)));
	}

      if (MEM_SIZE (in_rtx))
	{
	  fputs (" S", outfile);
	  fprintf (outfile, HOST_WIDE_INT_PRINT_DEC,
		   INTVAL (MEM_SIZE (in_rtx)));
	}

      if (MEM_ALIGN (in_rtx) != 1)
	fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));

      fputc (']', outfile);
      break;

    case CONST_DOUBLE:
      if (FLOAT_MODE_P (GET_MODE (in_rtx)))
	{
	  char s[60];

	  real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
			   sizeof (s), 0, 1);
	  fprintf (outfile, " %s", s);

	  real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
			       sizeof (s), 0, 1);
	  fprintf (outfile, " [%s]", s);
	}
      break;
#endif

    case CODE_LABEL:
      fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
      switch (LABEL_KIND (in_rtx))
	{
	  case LABEL_NORMAL: break;
	  case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
	  case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
	  case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
	  default: abort();
	}
      break;

    case CALL_PLACEHOLDER:
      if (debug_call_placeholder_verbose)
	{
	  fputs (" (cond [\n  (const_string \"normal\") (sequence [", outfile);
	  for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
	    {
	      fputs ("\n    ", outfile);
	      print_inline_rtx (outfile, tem, 4);
	    }

	  tem = XEXP (in_rtx, 1);
	  if (tem)
	    fputs ("\n    ])\n  (const_string \"tail_call\") (sequence [",
		   outfile);
	  for (; tem != 0; tem = NEXT_INSN (tem))
	    {
	      fputs ("\n    ", outfile);
	      print_inline_rtx (outfile, tem, 4);
	    }

	  tem = XEXP (in_rtx, 2);
	  if (tem)
	    fputs ("\n    ])\n  (const_string \"tail_recursion\") (sequence [",
		   outfile);
	  for (; tem != 0; tem = NEXT_INSN (tem))
	    {
	      fputs ("\n    ", outfile);
	      print_inline_rtx (outfile, tem, 4);
	    }

	  fputs ("\n    ])\n  ])", outfile);
	  break;
	}

      for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
	if (GET_CODE (tem) == CALL_INSN)
	  {
	    fprintf (outfile, " ");
	    print_rtx (tem);
	    break;
	  }
      break;

    default:
      break;
    }

  if (dump_for_graph
      && (is_insn || GET_CODE (in_rtx) == NOTE
	  || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
    sawclose = 0;
  else
    {
      fputc (')', outfile);
      sawclose = 1;
    }
}

/* Print an rtx on the current line of FILE.  Initially indent IND
   characters.  */

void
print_inline_rtx (outf, x, ind)
     FILE *outf;
     rtx x;
     int ind;
{
  int oldsaw = sawclose;
  int oldindent = indent;

  sawclose = 0;
  indent = ind;
  outfile = outf;
  print_rtx (x);
  sawclose = oldsaw;
  indent = oldindent;
}

/* Call this function from the debugger to see what X looks like.  */

void
debug_rtx (x)
     rtx x;
{
  outfile = stderr;
  sawclose = 0;
  print_rtx (x);
  fprintf (stderr, "\n");
}

/* Count of rtx's to print with debug_rtx_list.
   This global exists because gdb user defined commands have no arguments.  */

int debug_rtx_count = 0;	/* 0 is treated as equivalent to 1 */

/* Call this function to print list from X on.

   N is a count of the rtx's to print. Positive values print from the specified
   rtx on.  Negative values print a window around the rtx.
   EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */

void
debug_rtx_list (x, n)
     rtx x;
     int n;
{
  int i,count;
  rtx insn;

  count = n == 0 ? 1 : n < 0 ? -n : n;

  /* If we are printing a window, back up to the start.  */

  if (n < 0)
    for (i = count / 2; i > 0; i--)
      {
	if (PREV_INSN (x) == 0)
	  break;
	x = PREV_INSN (x);
      }

  for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
    {
      debug_rtx (insn);
      fprintf (stderr, "\n");
    }
}

/* Call this function to print an rtx list from START to END inclusive.  */

void
debug_rtx_range (start, end)
     rtx start, end;
{
  while (1)
    {
      debug_rtx (start);
      fprintf (stderr, "\n");
      if (!start || start == end)
	break;
      start = NEXT_INSN (start);
    }
}

/* Call this function to search an rtx list to find one with insn uid UID,
   and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
   The found insn is returned to enable further debugging analysis.  */

rtx
debug_rtx_find (x, uid)
     rtx x;
     int uid;
{
  while (x != 0 && INSN_UID (x) != uid)
    x = NEXT_INSN (x);
  if (x != 0)
    {
      debug_rtx_list (x, debug_rtx_count);
      return x;
    }
  else
    {
      fprintf (stderr, "insn uid %d not found\n", uid);
      return 0;
    }
}

/* External entry point for printing a chain of insns
   starting with RTX_FIRST onto file OUTF.
   A blank line separates insns.

   If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */

void
print_rtl (outf, rtx_first)
     FILE *outf;
     rtx rtx_first;
{
  rtx tmp_rtx;

  outfile = outf;
  sawclose = 0;

  if (rtx_first == 0)
    {
      fputs (print_rtx_head, outf);
      fputs ("(nil)\n", outf);
    }
  else
    switch (GET_CODE (rtx_first))
      {
      case INSN:
      case JUMP_INSN:
      case CALL_INSN:
      case NOTE:
      case CODE_LABEL:
      case BARRIER:
	for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
	  if (! flag_dump_unnumbered
	      || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
	    {
	      fputs (print_rtx_head, outfile);
	      print_rtx (tmp_rtx);
	      fprintf (outfile, "\n");
	    }
	break;

      default:
	fputs (print_rtx_head, outfile);
	print_rtx (rtx_first);
      }
}

/* Like print_rtx, except specify a file.  */
/* Return nonzero if we actually printed anything.  */

int
print_rtl_single (outf, x)
     FILE *outf;
     rtx x;
{
  outfile = outf;
  sawclose = 0;
  if (! flag_dump_unnumbered
      || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
    {
      fputs (print_rtx_head, outfile);
      print_rtx (x);
      putc ('\n', outf);
      return 1;
    }
  return 0;
}


/* Like print_rtl except without all the detail; for example,
   if RTX is a CONST_INT then print in decimal format.  */

void
print_simple_rtl (outf, x)
     FILE *outf;
     rtx x;
{
  flag_simple = 1;
  print_rtl (outf, x);
  flag_simple = 0;
}