Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the

non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.

1 files changed, 800 insertions, 0 deletions

diff --git a/contrib/gcc/genemit.c b/contrib/gcc/genemit.c
new file mode 100644
index 0000000..ebed4f3
--- /dev/null
+++ b/contrib/gcc/genemit.c
@@ -0,0 +1,800 @@
+/* Generate code from machine description to emit insns as rtl.
+   Copyright (C) 1987, 1988, 1991, 1994, 1995 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+GNU CC 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.
+
+GNU CC 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 GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+
+#include <stdio.h>
+#include "hconfig.h"
+#include "rtl.h"
+#include "obstack.h"
+
+static struct obstack obstack;
+struct obstack *rtl_obstack = &obstack;
+
+#define obstack_chunk_alloc xmalloc
+#define obstack_chunk_free free
+
+extern void free ();
+extern rtx read_rtx ();
+
+char *xmalloc ();
+static void fatal ();
+void fancy_abort ();
+
+static int max_opno;
+static int max_dup_opno;
+static int register_constraints;
+static int insn_code_number;
+static int insn_index_number;
+
+/* Data structure for recording the patterns of insns that have CLOBBERs.
+   We use this to output a function that adds these CLOBBERs to a 
+   previously-allocated PARALLEL expression.  */
+
+struct clobber_pat
+{
+  struct clobber_ent *insns;
+  rtx pattern;
+  int first_clobber;
+  struct clobber_pat *next;
+} *clobber_list;
+
+/* Records one insn that uses the clobber list.  */
+
+struct clobber_ent
+{
+  int code_number;		/* Counts only insns.  */
+  struct clobber_ent *next;
+};
+
+static void
+max_operand_1 (x)
+     rtx x;
+{
+  register RTX_CODE code;
+  register int i;
+  register int len;
+  register char *fmt;
+
+  if (x == 0)
+    return;
+
+  code = GET_CODE (x);
+
+  if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
+    register_constraints = 1;
+  if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
+    register_constraints = 1;
+  if (code == MATCH_OPERAND || code == MATCH_OPERATOR
+      || code == MATCH_PARALLEL)
+    max_opno = MAX (max_opno, XINT (x, 0));
+  if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
+    max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
+
+  fmt = GET_RTX_FORMAT (code);
+  len = GET_RTX_LENGTH (code);
+  for (i = 0; i < len; i++)
+    {
+      if (fmt[i] == 'e' || fmt[i] == 'u')
+	max_operand_1 (XEXP (x, i));
+      else if (fmt[i] == 'E')
+	{
+	  int j;
+	  for (j = 0; j < XVECLEN (x, i); j++)
+	    max_operand_1 (XVECEXP (x, i, j));
+	}
+    }
+}
+
+static int
+max_operand_vec (insn, arg)
+     rtx insn;
+     int arg;
+{
+  register int len = XVECLEN (insn, arg);
+  register int i;
+
+  max_opno = -1;
+  max_dup_opno = -1;
+
+  for (i = 0; i < len; i++)
+    max_operand_1 (XVECEXP (insn, arg, i));
+
+  return max_opno + 1;
+}
+
+static void
+print_code (code)
+     RTX_CODE code;
+{
+  register char *p1;
+  for (p1 = GET_RTX_NAME (code); *p1; p1++)
+    {
+      if (*p1 >= 'a' && *p1 <= 'z')
+	putchar (*p1 + 'A' - 'a');
+      else
+	putchar (*p1);
+    }
+}
+
+/* Print a C expression to construct an RTX just like X,
+   substituting any operand references appearing within.  */
+
+static void
+gen_exp (x)
+     rtx x;
+{
+  register RTX_CODE code;
+  register int i;
+  register int len;
+  register char *fmt;
+
+  if (x == 0)
+    {
+      printf ("NULL_RTX");
+      return;
+    }
+
+  code = GET_CODE (x);
+
+  switch (code)
+    {
+    case MATCH_OPERAND:
+    case MATCH_DUP:
+      printf ("operand%d", XINT (x, 0));
+      return;
+
+    case MATCH_OP_DUP:
+      printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
+	      XINT (x, 0), XINT (x, 0));
+      for (i = 0; i < XVECLEN (x, 1); i++)
+	{
+	  printf (",\n\t\t");
+	  gen_exp (XVECEXP (x, 1, i));
+	}
+      printf (")");
+      return;
+
+    case MATCH_OPERATOR:
+      printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
+      printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
+      for (i = 0; i < XVECLEN (x, 2); i++)
+	{
+	  printf (",\n\t\t");
+	  gen_exp (XVECEXP (x, 2, i));
+	}
+      printf (")");
+      return;
+
+    case MATCH_PARALLEL:
+    case MATCH_PAR_DUP:
+      printf ("operand%d", XINT (x, 0));
+      return;
+
+    case MATCH_SCRATCH:
+      printf ("gen_rtx (SCRATCH, %smode, 0)", GET_MODE_NAME (GET_MODE (x)));
+      return;
+
+    case ADDRESS:
+      fatal ("ADDRESS expression code used in named instruction pattern");
+
+    case PC:
+      printf ("pc_rtx");
+      return;
+
+    case CC0:
+      printf ("cc0_rtx");
+      return;
+
+    case CONST_INT:
+      if (INTVAL (x) == 0)
+	printf ("const0_rtx");
+      else if (INTVAL (x) == 1)
+	printf ("const1_rtx");
+      else if (INTVAL (x) == -1)
+	printf ("constm1_rtx");
+      else if (INTVAL (x) == STORE_FLAG_VALUE)
+	printf ("const_true_rtx");
+      else
+	printf (
+#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT	     
+		"GEN_INT (%d)",
+#else
+		"GEN_INT (%ld)",
+#endif
+		INTVAL (x));
+      return;
+
+    case CONST_DOUBLE:
+      /* These shouldn't be written in MD files.  Instead, the appropriate
+	 routines in varasm.c should be called.  */
+      abort ();
+    }
+
+  printf ("gen_rtx (");
+  print_code (code);
+  printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
+
+  fmt = GET_RTX_FORMAT (code);
+  len = GET_RTX_LENGTH (code);
+  for (i = 0; i < len; i++)
+    {
+      if (fmt[i] == '0')
+	break;
+      printf (",\n\t");
+      if (fmt[i] == 'e' || fmt[i] == 'u')
+	gen_exp (XEXP (x, i));
+      else if (fmt[i] == 'i')
+	printf ("%u", XINT (x, i));
+      else if (fmt[i] == 's')
+	printf ("\"%s\"", XSTR (x, i));
+      else if (fmt[i] == 'E')
+	{
+	  int j;
+	  printf ("gen_rtvec (%d", XVECLEN (x, i));
+	  for (j = 0; j < XVECLEN (x, i); j++)
+	    {
+	      printf (",\n\t\t");
+	      gen_exp (XVECEXP (x, i, j));
+	    }
+	  printf (")");
+	}
+      else
+	abort ();
+    }
+  printf (")");
+}  
+
+/* Generate the `gen_...' function for a DEFINE_INSN.  */
+
+static void
+gen_insn (insn)
+     rtx insn;
+{
+  int operands;
+  register int i;
+
+  /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
+     registers or MATCH_SCRATCHes.  If so, store away the information for
+     later. */
+
+  if (XVEC (insn, 1))
+    {
+      for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
+	if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
+	    || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
+		&& GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
+	  break;
+
+      if (i != XVECLEN (insn, 1) - 1)
+	{
+	  register struct clobber_pat *p;
+	  register struct clobber_ent *link
+	    = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
+	  register int j;
+
+	  link->code_number = insn_code_number;
+
+	  /* See if any previous CLOBBER_LIST entry is the same as this
+	     one.  */
+
+	  for (p = clobber_list; p; p = p->next)
+	    {
+	      if (p->first_clobber != i + 1
+		  || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
+		continue;
+
+	      for (j = i + 1; j < XVECLEN (insn, 1); j++)
+		{
+		  rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
+		  rtx new = XEXP (XVECEXP (insn, 1, j), 0);
+
+		  /* OLD and NEW are the same if both are to be a SCRATCH
+		     of the same mode, 
+		     or if both are registers of the same mode and number.  */
+		  if (! (GET_MODE (old) == GET_MODE (new)
+			 && ((GET_CODE (old) == MATCH_SCRATCH
+			      && GET_CODE (new) == MATCH_SCRATCH)
+			     || (GET_CODE (old) == REG && GET_CODE (new) == REG
+				 && REGNO (old) == REGNO (new)))))
+		    break;
+		}
+      
+	      if (j == XVECLEN (insn, 1))
+		break;
+	    }
+
+	  if (p == 0)
+	    {
+	      p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
+	  
+	      p->insns = 0;
+	      p->pattern = insn;
+	      p->first_clobber = i + 1;
+	      p->next = clobber_list;
+	      clobber_list = p;
+	    }
+
+	  link->next = p->insns;
+	  p->insns = link;
+	}
+    }
+
+  /* Don't mention instructions whose names are the null string
+     or begin with '*'.  They are in the machine description just
+     to be recognized.  */
+  if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
+    return;
+
+  /* Find out how many operands this function has,
+     and also whether any of them have register constraints.  */
+  register_constraints = 0;
+  operands = max_operand_vec (insn, 1);
+  if (max_dup_opno >= operands)
+    fatal ("match_dup operand number has no match_operand");
+
+  /* Output the function name and argument declarations.  */
+  printf ("rtx\ngen_%s (", XSTR (insn, 0));
+  for (i = 0; i < operands; i++)
+    printf (i ? ", operand%d" : "operand%d", i);
+  printf (")\n");
+  for (i = 0; i < operands; i++)
+    printf ("     rtx operand%d;\n", i);
+  printf ("{\n");
+
+  /* Output code to construct and return the rtl for the instruction body */
+
+  if (XVECLEN (insn, 1) == 1)
+    {
+      printf ("  return ");
+      gen_exp (XVECEXP (insn, 1, 0));
+      printf (";\n}\n\n");
+    }
+  else
+    {
+      printf ("  return gen_rtx (PARALLEL, VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
+      for (i = 0; i < XVECLEN (insn, 1); i++)
+	{
+	  printf (",\n\t\t");
+	  gen_exp (XVECEXP (insn, 1, i));
+	}
+      printf ("));\n}\n\n");
+    }
+}
+
+/* Generate the `gen_...' function for a DEFINE_EXPAND.  */
+
+static void
+gen_expand (expand)
+     rtx expand;
+{
+  int operands;
+  register int i;
+
+  if (strlen (XSTR (expand, 0)) == 0)
+    fatal ("define_expand lacks a name");
+  if (XVEC (expand, 1) == 0)
+    fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
+
+  /* Find out how many operands this function has,
+     and also whether any of them have register constraints.  */
+  register_constraints = 0;
+
+  operands = max_operand_vec (expand, 1);
+
+  /* Output the function name and argument declarations.  */
+  printf ("rtx\ngen_%s (", XSTR (expand, 0));
+  for (i = 0; i < operands; i++)
+    printf (i ? ", operand%d" : "operand%d", i);
+  printf (")\n");
+  for (i = 0; i < operands; i++)
+    printf ("     rtx operand%d;\n", i);
+  printf ("{\n");
+
+  /* If we don't have any C code to write, only one insn is being written,
+     and no MATCH_DUPs are present, we can just return the desired insn
+     like we do for a DEFINE_INSN.  This saves memory.  */
+  if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
+      && operands > max_dup_opno
+      && XVECLEN (expand, 1) == 1)
+    {
+      printf ("  return ");
+      gen_exp (XVECEXP (expand, 1, 0));
+      printf (";\n}\n\n");
+      return;
+    }
+
+  /* For each operand referred to only with MATCH_DUPs,
+     make a local variable.  */
+  for (i = operands; i <= max_dup_opno; i++)
+    printf ("  rtx operand%d;\n", i);
+  if (operands > 0 || max_dup_opno >= 0)
+    printf ("  rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
+  printf ("  rtx _val = 0;\n");
+  printf ("  start_sequence ();\n");
+
+  /* The fourth operand of DEFINE_EXPAND is some code to be executed
+     before the actual construction.
+     This code expects to refer to `operands'
+     just as the output-code in a DEFINE_INSN does,
+     but here `operands' is an automatic array.
+     So copy the operand values there before executing it.  */
+  if (XSTR (expand, 3) && *XSTR (expand, 3))
+    {
+      /* Output code to copy the arguments into `operands'.  */
+      for (i = 0; i < operands; i++)
+	printf ("  operands[%d] = operand%d;\n", i, i);
+
+      /* Output the special code to be executed before the sequence
+	 is generated.  */
+      printf ("%s\n", XSTR (expand, 3));
+
+      /* Output code to copy the arguments back out of `operands'
+	 (unless we aren't going to use them at all).  */
+      if (XVEC (expand, 1) != 0)
+	{
+	  for (i = 0; i < operands; i++)
+	    printf ("  operand%d = operands[%d];\n", i, i);
+	  for (; i <= max_dup_opno; i++)
+	    printf ("  operand%d = operands[%d];\n", i, i);
+	}
+    }
+
+  /* Output code to construct the rtl for the instruction bodies.
+     Use emit_insn to add them to the sequence being accumulated.
+     But don't do this if the user's code has set `no_more' nonzero.  */
+
+  for (i = 0; i < XVECLEN (expand, 1); i++)
+    {
+      rtx next = XVECEXP (expand, 1, i);
+      if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
+	  || (GET_CODE (next) == PARALLEL
+	      && GET_CODE (XVECEXP (next, 0, 0)) == SET
+	      && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
+	  || GET_CODE (next) == RETURN)
+	printf ("  emit_jump_insn (");
+      else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
+	       || GET_CODE (next) == CALL
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == SET
+		   && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
+	printf ("  emit_call_insn (");
+      else if (GET_CODE (next) == CODE_LABEL)
+	printf ("  emit_label (");
+      else if (GET_CODE (next) == MATCH_OPERAND
+	       || GET_CODE (next) == MATCH_OPERATOR
+	       || GET_CODE (next) == MATCH_PARALLEL
+	       || GET_CODE (next) == MATCH_OP_DUP
+	       || GET_CODE (next) == MATCH_DUP
+	       || GET_CODE (next) == PARALLEL)
+	printf ("  emit (");
+      else
+	printf ("  emit_insn (");
+      gen_exp (next);
+      printf (");\n");
+      if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
+	  && GET_CODE (SET_SRC (next)) == LABEL_REF)
+	printf ("  emit_barrier ();");
+    }
+
+  /* Call `gen_sequence' to make a SEQUENCE out of all the
+     insns emitted within this gen_... function.  */
+
+  printf (" _done:\n");
+  printf ("  _val = gen_sequence ();\n");
+  printf (" _fail:\n");
+  printf ("  end_sequence ();\n");
+  printf ("  return _val;\n}\n\n");
+}
+
+/* Like gen_expand, but generates a SEQUENCE.  */
+static void
+gen_split (split)
+     rtx split;
+{
+  register int i;
+  int operands;
+
+  if (XVEC (split, 0) == 0)
+    fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
+  else if (XVEC (split, 2) == 0)
+    fatal ("define_split (definition %d) lacks a replacement pattern",
+	   insn_index_number);
+
+  /* Find out how many operands this function has.  */
+
+  max_operand_vec (split, 2);
+  operands = MAX (max_opno, max_dup_opno) + 1;
+
+  /* Output the function name and argument declarations.  */
+  printf ("rtx\ngen_split_%d (operands)\n     rtx *operands;\n",
+	  insn_code_number);
+  printf ("{\n");
+
+  /* Declare all local variables.  */
+  for (i = 0; i < operands; i++)
+    printf ("  rtx operand%d;\n", i);
+  printf ("  rtx _val = 0;\n");
+  printf ("  start_sequence ();\n");
+
+  /* The fourth operand of DEFINE_SPLIT is some code to be executed
+     before the actual construction.  */
+
+  if (XSTR (split, 3))
+    printf ("%s\n", XSTR (split, 3));
+
+  /* Output code to copy the arguments back out of `operands'  */
+  for (i = 0; i < operands; i++)
+    printf ("  operand%d = operands[%d];\n", i, i);
+
+  /* Output code to construct the rtl for the instruction bodies.
+     Use emit_insn to add them to the sequence being accumulated.
+     But don't do this if the user's code has set `no_more' nonzero.  */
+
+  for (i = 0; i < XVECLEN (split, 2); i++)
+    {
+      rtx next = XVECEXP (split, 2, i);
+      if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
+	  || (GET_CODE (next) == PARALLEL
+	      && GET_CODE (XVECEXP (next, 0, 0)) == SET
+	      && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
+	  || GET_CODE (next) == RETURN)
+	printf ("  emit_jump_insn (");
+      else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
+	       || GET_CODE (next) == CALL
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == SET
+		   && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
+	       || (GET_CODE (next) == PARALLEL
+		   && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
+	printf ("  emit_call_insn (");
+      else if (GET_CODE (next) == CODE_LABEL)
+	printf ("  emit_label (");
+      else if (GET_CODE (next) == MATCH_OPERAND
+	       || GET_CODE (next) == MATCH_OPERATOR
+	       || GET_CODE (next) == MATCH_PARALLEL
+	       || GET_CODE (next) == MATCH_OP_DUP
+	       || GET_CODE (next) == MATCH_DUP
+	       || GET_CODE (next) == PARALLEL)
+	printf ("  emit (");
+      else
+	printf ("  emit_insn (");
+      gen_exp (next);
+      printf (");\n");
+      if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
+	  && GET_CODE (SET_SRC (next)) == LABEL_REF)
+	printf ("  emit_barrier ();");
+    }
+
+  /* Call `gen_sequence' to make a SEQUENCE out of all the
+     insns emitted within this gen_... function.  */
+
+  printf (" _done:\n");
+  printf ("  _val = gen_sequence ();\n");
+  printf (" _fail:\n");
+  printf ("  end_sequence ();\n");
+  printf ("  return _val;\n}\n\n");
+}
+
+/* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
+   size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
+   the end of the vector.  */
+
+static void
+output_add_clobbers ()
+{
+  struct clobber_pat *clobber;
+  struct clobber_ent *ent;
+  int i;
+
+  printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
+  printf ("     rtx pattern;\n     int insn_code_number;\n");
+  printf ("{\n");
+  printf ("  int i;\n\n");
+  printf ("  switch (insn_code_number)\n");
+  printf ("    {\n");
+
+  for (clobber = clobber_list; clobber; clobber = clobber->next)
+    {
+      for (ent = clobber->insns; ent; ent = ent->next)
+	printf ("    case %d:\n", ent->code_number);
+
+      for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
+	{
+	  printf ("      XVECEXP (pattern, 0, %d) = ", i);
+	  gen_exp (XVECEXP (clobber->pattern, 1, i));
+	  printf (";\n");
+	}
+
+      printf ("      break;\n\n");
+    }
+
+  printf ("    default:\n");
+  printf ("      abort ();\n");
+  printf ("    }\n");
+  printf ("}\n");
+}
+
+/* Write a function, init_mov_optab, that is called to set up entries
+   in mov_optab for EXTRA_CC_MODES.  */
+
+static void
+output_init_mov_optab ()
+{
+#ifdef EXTRA_CC_NAMES
+  static char *cc_names[] = { EXTRA_CC_NAMES };
+  char *p;
+  int i;
+
+  printf ("\nvoid\ninit_mov_optab ()\n{\n");
+
+  for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
+    {
+      printf ("#ifdef HAVE_mov");
+      for (p = cc_names[i]; *p; p++)
+	printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
+      printf ("\n");
+      printf ("  if (HAVE_mov");
+      for (p = cc_names[i]; *p; p++)
+	printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
+      printf (")\n");
+      printf ("    mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
+	      cc_names[i]);
+      for (p = cc_names[i]; *p; p++)
+	printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
+      printf (";\n#endif\n");
+    }
+
+  printf ("}\n");
+#endif
+}
+
+char *
+xmalloc (size)
+     unsigned size;
+{
+  register char *val = (char *) malloc (size);
+
+  if (val == 0)
+    fatal ("virtual memory exhausted");
+
+  return val;
+}
+
+char *
+xrealloc (ptr, size)
+     char *ptr;
+     unsigned size;
+{
+  char *result = (char *) realloc (ptr, size);
+  if (!result)
+    fatal ("virtual memory exhausted");
+  return result;
+}
+
+static void
+fatal (s, a1, a2)
+     char *s;
+{
+  fprintf (stderr, "genemit: ");
+  fprintf (stderr, s, a1, a2);
+  fprintf (stderr, "\n");
+  exit (FATAL_EXIT_CODE);
+}
+
+/* More 'friendly' abort that prints the line and file.
+   config.h can #define abort fancy_abort if you like that sort of thing.  */
+
+void
+fancy_abort ()
+{
+  fatal ("Internal gcc abort.");
+}
+
+int
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  rtx desc;
+  FILE *infile;
+  register int c;
+
+  obstack_init (rtl_obstack);
+
+  if (argc <= 1)
+    fatal ("No input file name.");
+
+  infile = fopen (argv[1], "r");
+  if (infile == 0)
+    {
+      perror (argv[1]);
+      exit (FATAL_EXIT_CODE);
+    }
+
+  init_rtl ();
+
+  /* Assign sequential codes to all entries in the machine description
+     in parallel with the tables in insn-output.c.  */
+
+  insn_code_number = 0;
+  insn_index_number = 0;
+
+  printf ("/* Generated automatically by the program `genemit'\n\
+from the machine description file `md'.  */\n\n");
+
+  printf ("#include \"config.h\"\n");
+  printf ("#include \"rtl.h\"\n");
+  printf ("#include \"expr.h\"\n");
+  printf ("#include \"real.h\"\n");
+  printf ("#include \"output.h\"\n");
+  printf ("#include \"insn-config.h\"\n\n");
+  printf ("#include \"insn-flags.h\"\n\n");
+  printf ("#include \"insn-codes.h\"\n\n");
+  printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
+  printf ("extern rtx recog_operand[];\n");
+  printf ("#define operands emit_operand\n\n");
+  printf ("#define FAIL goto _fail\n\n");
+  printf ("#define DONE goto _done\n\n");
+
+  /* Read the machine description.  */
+
+  while (1)
+    {
+      c = read_skip_spaces (infile);
+      if (c == EOF)
+	break;
+      ungetc (c, infile);
+
+      desc = read_rtx (infile);
+      if (GET_CODE (desc) == DEFINE_INSN)
+	{
+	  gen_insn (desc);
+	  ++insn_code_number;
+	}
+      if (GET_CODE (desc) == DEFINE_EXPAND)
+	{
+	  gen_expand (desc);
+	  ++insn_code_number;
+	}
+      if (GET_CODE (desc) == DEFINE_SPLIT)
+	{
+	  gen_split (desc);
+	  ++insn_code_number;
+	}
+      if (GET_CODE (desc) == DEFINE_PEEPHOLE)
+	{
+	  ++insn_code_number;
+	}
+      ++insn_index_number;
+    }
+
+  /* Write out the routine to add CLOBBERs to a pattern.  */
+  output_add_clobbers ();
+
+  /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES.  */
+  output_init_mov_optab ();
+
+  fflush (stdout);
+  exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
+  /* NOTREACHED */
+  return 0;
+}