gcc/genconfig.c - gcc - Git at Google

 /* Generate from machine description:

    - some #define configuration flags.
    Copyright (C) 1987, 1991 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 ();

 /* flags to determine output of machine description dependent #define's.  */
 static int max_recog_operands;  /* Largest operand number seen.  */
 static int max_dup_operands;    /* Largest number of match_dup in any insn.  */
 static int max_clobbers_per_insn;
 static int register_constraint_flag;
 static int have_cc0_flag;
 static int have_cmove_flag;
 static int have_lo_sum_flag;

 /* Maximum number of insns seen in a split.  */
 static int max_insns_per_split = 1;

 static int clobbers_seen_this_insn;
 static int dup_operands_seen_this_insn;

 char *xmalloc ();
 static void fatal ();
 void fancy_abort ();

 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
    be used to recognize, rather than just generate an insn.

    NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
    of a SET whose destination is not (pc).  */

 static void
 walk_insn_part (part, recog_p, non_pc_set_src)
      rtx part;
      int recog_p;
      int non_pc_set_src;
 {
   register int i, j;
   register RTX_CODE code;
   register char *format_ptr;

   if (part == 0)
     return;

   code = GET_CODE (part);
   switch (code)
     {
     case CLOBBER:
       clobbers_seen_this_insn++;
       break;

     case MATCH_OPERAND:
       if (XINT (part, 0) > max_recog_operands)
 	max_recog_operands = XINT (part, 0);
       if (XSTR (part, 2) && *XSTR (part, 2))
 	register_constraint_flag = 1;
       return;

     case MATCH_OP_DUP:
     case MATCH_PAR_DUP:
       ++dup_operands_seen_this_insn;
     case MATCH_SCRATCH:
     case MATCH_PARALLEL:
     case MATCH_OPERATOR:
       if (XINT (part, 0) > max_recog_operands)
 	max_recog_operands = XINT (part, 0);
       /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
 	 MATCH_PARALLEL.  */
       break;

     case LABEL_REF:
       if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
 	break;
       return;

     case MATCH_DUP:
       ++dup_operands_seen_this_insn;
       if (XINT (part, 0) > max_recog_operands)
 	max_recog_operands = XINT (part, 0);
       return;

     case CC0:
       if (recog_p)
 	have_cc0_flag = 1;
       return;

     case LO_SUM:
       if (recog_p)
 	have_lo_sum_flag = 1;
       return;

     case SET:
       walk_insn_part (SET_DEST (part), 0, recog_p);
       walk_insn_part (SET_SRC (part), recog_p,
 		      GET_CODE (SET_DEST (part)) != PC);
       return;

     case IF_THEN_ELSE:
       /* Only consider this machine as having a conditional move if the
 	 two arms of the IF_THEN_ELSE are both MATCH_OPERAND.  Otherwise,
 	 we have some specific IF_THEN_ELSE construct (like the doz
 	 instruction on the RS/6000) that can't be used in the general
 	 context we want it for.  */

       if (recog_p && non_pc_set_src
 	  && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
 	  && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
 	have_cmove_flag = 1;
       break;

     case REG: case CONST_INT: case SYMBOL_REF:
     case PC:
       return;
     }

   format_ptr = GET_RTX_FORMAT (GET_CODE (part));

   for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
     switch (*format_ptr++)
       {
       case 'e':
       case 'u':
 	walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
 	break;
       case 'E':
 	if (XVEC (part, i) != NULL)
 	  for (j = 0; j < XVECLEN (part, i); j++)
 	    walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
 	break;
       }
 }

 static void
 gen_insn (insn)
      rtx insn;
 {
   int i;

   /* Walk the insn pattern to gather the #define's status.  */
   clobbers_seen_this_insn = 0;
   dup_operands_seen_this_insn = 0;
   if (XVEC (insn, 1) != 0)
     for (i = 0; i < XVECLEN (insn, 1); i++)
       walk_insn_part (XVECEXP (insn, 1, i), 1, 0);

   if (clobbers_seen_this_insn > max_clobbers_per_insn)
     max_clobbers_per_insn = clobbers_seen_this_insn;
   if (dup_operands_seen_this_insn > max_dup_operands)
     max_dup_operands = dup_operands_seen_this_insn;
 }

 /* Similar but scan a define_expand.  */

 static void
 gen_expand (insn)
      rtx insn;
 {
   int i;

   /* Walk the insn pattern to gather the #define's status.  */

   /* Note that we don't bother recording the number of MATCH_DUPs
      that occur in a gen_expand, because only reload cares about that.  */
   if (XVEC (insn, 1) != 0)
     for (i = 0; i < XVECLEN (insn, 1); i++)
       {
 	/* Compute the maximum SETs and CLOBBERS
 	   in any one of the sub-insns;
 	   don't sum across all of them.  */
 	clobbers_seen_this_insn = 0;

 	walk_insn_part (XVECEXP (insn, 1, i), 0, 0);

 	if (clobbers_seen_this_insn > max_clobbers_per_insn)
 	  max_clobbers_per_insn = clobbers_seen_this_insn;
       }
 }

 /* Similar but scan a define_split.  */

 static void
 gen_split (split)
      rtx split;
 {
   int i;

   /* Look through the patterns that are matched
      to compute the maximum operand number.  */
   for (i = 0; i < XVECLEN (split, 0); i++)
     walk_insn_part (XVECEXP (split, 0, i), 1, 0);
   /* Look at the number of insns this insn could split into.  */
   if (XVECLEN (split, 2) > max_insns_per_split)
     max_insns_per_split = XVECLEN (split, 2);
 }

 static void
 gen_peephole (peep)
      rtx peep;
 {
   int i;

   /* Look through the patterns that are matched
      to compute the maximum operand number.  */
   for (i = 0; i < XVECLEN (peep, 0); i++)
     walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
 }

 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, "genconfig: ");
   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 ();

   printf ("/* Generated automatically by the program `genconfig'\n\
 from the machine description file `md'.  */\n\n");

   /* Allow at least 10 operands for the sake of asm constructs.  */
   max_recog_operands = 9;  /* We will add 1 later.  */
   max_dup_operands = 1;

   /* 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);
       if (GET_CODE (desc) == DEFINE_EXPAND)
 	gen_expand (desc);
       if (GET_CODE (desc) == DEFINE_SPLIT)
 	gen_split (desc);
       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
 	gen_peephole (desc);
     }

   printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);

   printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);

   /* This is conditionally defined, in case the user writes code which emits
      more splits than we can readily see (and knows s/he does it).  */
   printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
 	  max_insns_per_split);

   if (register_constraint_flag)
     printf ("#define REGISTER_CONSTRAINTS\n");

   if (have_cc0_flag)
     printf ("#define HAVE_cc0\n");

   if (have_cmove_flag)
     printf ("#define HAVE_conditional_move\n");

   if (have_lo_sum_flag)
     printf ("#define HAVE_lo_sum\n");

   fflush (stdout);
   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
   /* NOTREACHED */
   return 0;
 }
	/* Generate from machine description:

	- some #define configuration flags.
	Copyright (C) 1987, 1991 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 ();

	/* flags to determine output of machine description dependent #define's. */
	static int max_recog_operands; /* Largest operand number seen. */
	static int max_dup_operands; /* Largest number of match_dup in any insn. */
	static int max_clobbers_per_insn;
	static int register_constraint_flag;
	static int have_cc0_flag;
	static int have_cmove_flag;
	static int have_lo_sum_flag;

	/* Maximum number of insns seen in a split. */
	static int max_insns_per_split = 1;

	static int clobbers_seen_this_insn;
	static int dup_operands_seen_this_insn;

	char *xmalloc ();
	static void fatal ();
	void fancy_abort ();

	/* RECOG_P will be non-zero if this pattern was seen in a context where it will
	be used to recognize, rather than just generate an insn.

	NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
	of a SET whose destination is not (pc). */

	static void
	walk_insn_part (part, recog_p, non_pc_set_src)
	rtx part;
	int recog_p;
	int non_pc_set_src;
	{
	register int i, j;
	register RTX_CODE code;
	register char *format_ptr;

	if (part == 0)
	return;

	code = GET_CODE (part);
	switch (code)
	{
	case CLOBBER:
	clobbers_seen_this_insn++;
	break;

	case MATCH_OPERAND:
	if (XINT (part, 0) > max_recog_operands)
	max_recog_operands = XINT (part, 0);
	if (XSTR (part, 2) && *XSTR (part, 2))
	register_constraint_flag = 1;
	return;

	case MATCH_OP_DUP:
	case MATCH_PAR_DUP:
	++dup_operands_seen_this_insn;
	case MATCH_SCRATCH:
	case MATCH_PARALLEL:
	case MATCH_OPERATOR:
	if (XINT (part, 0) > max_recog_operands)
	max_recog_operands = XINT (part, 0);
	/* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
	MATCH_PARALLEL. */
	break;

	case LABEL_REF:
	if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
	break;
	return;

	case MATCH_DUP:
	++dup_operands_seen_this_insn;
	if (XINT (part, 0) > max_recog_operands)
	max_recog_operands = XINT (part, 0);
	return;

	case CC0:
	if (recog_p)
	have_cc0_flag = 1;
	return;

	case LO_SUM:
	if (recog_p)
	have_lo_sum_flag = 1;
	return;

	case SET:
	walk_insn_part (SET_DEST (part), 0, recog_p);
	walk_insn_part (SET_SRC (part), recog_p,
	GET_CODE (SET_DEST (part)) != PC);
	return;

	case IF_THEN_ELSE:
	/* Only consider this machine as having a conditional move if the
	two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
	we have some specific IF_THEN_ELSE construct (like the doz
	instruction on the RS/6000) that can't be used in the general
	context we want it for. */

	if (recog_p && non_pc_set_src
	&& GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
	&& GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
	have_cmove_flag = 1;
	break;

	case REG: case CONST_INT: case SYMBOL_REF:
	case PC:
	return;
	}

	format_ptr = GET_RTX_FORMAT (GET_CODE (part));

	for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
	switch (*format_ptr++)
	{
	case 'e':
	case 'u':
	walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
	break;
	case 'E':
	if (XVEC (part, i) != NULL)
	for (j = 0; j < XVECLEN (part, i); j++)
	walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
	break;
	}
	}

	static void
	gen_insn (insn)
	rtx insn;
	{
	int i;

	/* Walk the insn pattern to gather the #define's status. */
	clobbers_seen_this_insn = 0;
	dup_operands_seen_this_insn = 0;
	if (XVEC (insn, 1) != 0)
	for (i = 0; i < XVECLEN (insn, 1); i++)
	walk_insn_part (XVECEXP (insn, 1, i), 1, 0);

	if (clobbers_seen_this_insn > max_clobbers_per_insn)
	max_clobbers_per_insn = clobbers_seen_this_insn;
	if (dup_operands_seen_this_insn > max_dup_operands)
	max_dup_operands = dup_operands_seen_this_insn;
	}

	/* Similar but scan a define_expand. */

	static void
	gen_expand (insn)
	rtx insn;
	{
	int i;

	/* Walk the insn pattern to gather the #define's status. */

	/* Note that we don't bother recording the number of MATCH_DUPs
	that occur in a gen_expand, because only reload cares about that. */
	if (XVEC (insn, 1) != 0)
	for (i = 0; i < XVECLEN (insn, 1); i++)
	{
	/* Compute the maximum SETs and CLOBBERS
	in any one of the sub-insns;
	don't sum across all of them. */
	clobbers_seen_this_insn = 0;

	walk_insn_part (XVECEXP (insn, 1, i), 0, 0);

	if (clobbers_seen_this_insn > max_clobbers_per_insn)
	max_clobbers_per_insn = clobbers_seen_this_insn;
	}
	}

	/* Similar but scan a define_split. */

	static void
	gen_split (split)
	rtx split;
	{
	int i;

	/* Look through the patterns that are matched
	to compute the maximum operand number. */
	for (i = 0; i < XVECLEN (split, 0); i++)
	walk_insn_part (XVECEXP (split, 0, i), 1, 0);
	/* Look at the number of insns this insn could split into. */
	if (XVECLEN (split, 2) > max_insns_per_split)
	max_insns_per_split = XVECLEN (split, 2);
	}

	static void
	gen_peephole (peep)
	rtx peep;
	{
	int i;

	/* Look through the patterns that are matched
	to compute the maximum operand number. */
	for (i = 0; i < XVECLEN (peep, 0); i++)
	walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
	}

	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, "genconfig: ");
	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 ();

	printf ("/* Generated automatically by the program `genconfig'\n\
	from the machine description file `md'. */\n\n");

	/* Allow at least 10 operands for the sake of asm constructs. */
	max_recog_operands = 9; /* We will add 1 later. */
	max_dup_operands = 1;

	/* 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);
	if (GET_CODE (desc) == DEFINE_EXPAND)
	gen_expand (desc);
	if (GET_CODE (desc) == DEFINE_SPLIT)
	gen_split (desc);
	if (GET_CODE (desc) == DEFINE_PEEPHOLE)
	gen_peephole (desc);
	}

	printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);

	printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);

	/* This is conditionally defined, in case the user writes code which emits
	more splits than we can readily see (and knows s/he does it). */
	printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
	max_insns_per_split);

	if (register_constraint_flag)
	printf ("#define REGISTER_CONSTRAINTS\n");

	if (have_cc0_flag)
	printf ("#define HAVE_cc0\n");

	if (have_cmove_flag)
	printf ("#define HAVE_conditional_move\n");

	if (have_lo_sum_flag)
	printf ("#define HAVE_lo_sum\n");

	fflush (stdout);
	exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
	/* NOTREACHED */
	return 0;
	}