[gcc.git] / gcc / gengenrtl.c

/* Generate code to allocate RTL structures.
   Copyright (C) 1997, 1998, 1999 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 "hconfig.h"
#include "system.h"

#define NO_GENRTL_H
#include "rtl.h"
#undef abort

#include "real.h"

/* Calculate the format for CONST_DOUBLE.  This depends on the relative
   widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
   We only need to go out to e0wwww, since min(HOST_WIDE_INT)==32 and
   max(LONG_DOUBLE_TYPE_SIZE)==128.
   This is duplicated in rtl.c.  
   A number of places assume that there are always at least two 'w'
   slots in a CONST_DOUBLE, so we provide them even if one would suffice.  */
#if HOST_BITS_PER_WIDE_INT >= LONG_DOUBLE_TYPE_SIZE
#define CONST_DOUBLE_FORMAT	"e0ww"
#elif HOST_BITS_PER_WIDE_INT*2 >= LONG_DOUBLE_TYPE_SIZE
#define CONST_DOUBLE_FORMAT	"e0ww"
#elif HOST_BITS_PER_WIDE_INT*3 >= LONG_DOUBLE_TYPE_SIZE
#define CONST_DOUBLE_FORMAT	"e0www"
#elif HOST_BITS_PER_WIDE_INT*4 >= LONG_DOUBLE_TYPE_SIZE
#define CONST_DOUBLE_FORMAT	"e0wwww"
#else
#define CONST_DOUBLE_FORMAT	/* nothing - will cause syntax error */
#endif


struct rtx_definition 
{
  const char *enumname, *name, *format;
};

#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGIFY(ENUM), NAME, FORMAT },

struct rtx_definition defs[] = 
{  
#include "rtl.def"		/* rtl expressions are documented here */
};

const char *formats[NUM_RTX_CODE];

static const char *type_from_format PROTO((int));
static const char *accessor_from_format PROTO((int));
static int special_format PROTO((const char *));
static int special_rtx PROTO((int));
static void find_formats PROTO((void));
static void gendecl PROTO((FILE *, const char *));
static void genmacro PROTO((FILE *, int));
static void gendef PROTO((FILE *, const char *));
static void genlegend PROTO((FILE *));
static void genheader PROTO((FILE *));
static void gencode PROTO((FILE *));

/* Decode a format letter into a C type string.  */

static const char *
type_from_format (c)
     int c;
{
  switch (c)
    {
    case 'i':
      return "int";
    case 'w':
      return "HOST_WIDE_INT";
    case 's':
      return "char *";
    case 'e':
    case 'u':
      return "rtx";
    case 'E':
      return "rtvec";
    case 'b':
      return "struct bitmap_head_def *";  /* bitmap - typedef not available */
    case 't':
      return "union tree_node *";  /* tree - typedef not available */
    default:
      abort ();
    }
}

/* Decode a format letter into the proper accessor function.  */

static const char *
accessor_from_format (c)
     int c;
{
  switch (c)
    {
    case 'i':
      return "XINT";
    case 'w':
      return "XWINT";
    case 's':
      return "XSTR";
    case 'e':
    case 'u':
      return "XEXP";
    case 'E':
      return "XVEC";
    case 'b':
      return "XBITMAP";
    case 't':
      return "XTREE";
    default:
      abort ();
    }
}

/* Return true if a format character doesn't need normal processing.  */

static int
special_format (fmt)
     const char *fmt;
{
  return (strchr (fmt, '*') != 0
	  || strchr (fmt, 'V') != 0
	  || strchr (fmt, 'S') != 0
	  || strchr (fmt, 'n') != 0);
}

/* Return true if an rtx requires special processing.  */

static int
special_rtx (idx)
     int idx;
{
  return (strcmp (defs[idx].enumname, "CONST_INT") == 0
	  || strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
	  || strcmp (defs[idx].enumname, "REG") == 0
	  || strcmp (defs[idx].enumname, "MEM") == 0);
}

/* Fill `formats' with all unique format strings.  */

static void
find_formats ()
{
  int i;

  for (i = 0; i < NUM_RTX_CODE; ++i)
    {
      const char **f;

      if (special_format (defs[i].format))
	continue;

      for (f = formats; *f ; ++f)
	if (! strcmp (*f, defs[i].format))
	  break;

      if (!*f)
	*f = defs[i].format;
    }
}

/* Emit a prototype for the rtx generator for a format.  */

static void
gendecl (f, format)
     FILE *f;
     const char *format;
{
  const char *p;
  int i;
  
  fprintf (f, "extern rtx gen_rtx_fmt_%s PROTO((RTX_CODE, enum machine_mode mode",
	   format);
  for (p = format, i = 0; *p ; ++p)
    if (*p != '0')
      fprintf (f, ", %s arg%d", type_from_format (*p), i++);
  fprintf (f, "));\n");
}

/* Emit a define mapping an rtx code to the generator for its format.  */

static void 
genmacro (f, idx)
     FILE *f;
     int idx;
{
  const char *p;
  int i;

  fprintf (f, "#define gen_rtx_%s%s(mode",
	   (special_rtx (idx) ? "raw_" : ""), defs[idx].enumname);

  for (p = defs[idx].format, i = 0; *p ; ++p)
    if (*p != '0')
      fprintf (f, ", arg%d", i++);
  fprintf (f, ")   ");

  fprintf (f, "gen_rtx_fmt_%s(%s,(mode)", defs[idx].format, defs[idx].enumname);
  for (p = defs[idx].format, i = 0; *p ; ++p)
    if (*p != '0')
      fprintf (f, ",(arg%d)", i++);
  fprintf (f, ")\n");
}

/* Emit the implementation for the rtx generator for a format.  */

static void
gendef (f, format)
     FILE *f;
     const char *format;
{
  const char *p;
  int i, j;
  
  fprintf (f, "rtx\ngen_rtx_fmt_%s (code, mode", format);
  for (p = format, i = 0; *p ; ++p)
    if (*p != '0')
      fprintf (f, ", arg%d", i++);

  fprintf (f, ")\n     RTX_CODE code;\n     enum machine_mode mode;\n");
  for (p = format, i = 0; *p ; ++p)
    if (*p != '0')
      fprintf (f, "     %s arg%d;\n", type_from_format (*p), i++);

  /* See rtx_alloc in rtl.c for comments.  */
  fprintf (f, "{\n");
  fprintf (f, "  rtx rt = obstack_alloc_rtx (sizeof (struct rtx_def) + %d * sizeof (rtunion));\n",
	   (int) strlen (format) - 1);

  fprintf (f, "  PUT_CODE (rt, code);\n");
  fprintf (f, "  PUT_MODE (rt, mode);\n");

  for (p = format, i = j = 0; *p ; ++p, ++i)
    if (*p != '0')
      {
	fprintf (f, "  %s (rt, %d) = arg%d;\n",
		 accessor_from_format (*p), i, j++);
      }

  fprintf (f, "\n  return rt;\n}\n\n");
}

/* Emit the `do not edit' banner.  */

static void
genlegend (f)
     FILE *f;
{
  fputs ("/* Generated automaticaly by the program `gengenrtl'\n", f);
  fputs ("   from the RTL description file `rtl.def' */\n\n", f);
}

/* Emit "genrtl.h".  */

static void
genheader (f)
     FILE *f;
{
  int i;
  const char **fmt;

  for (fmt = formats; *fmt; ++fmt)
    gendecl (f, *fmt);

  fprintf (f, "\n");

  for (i = 0; i < NUM_RTX_CODE; i++)
    {
      if (special_format (defs[i].format))
	continue;
      genmacro (f, i);
    }
}

/* Emit "genrtl.c".  */

static void
gencode (f)
     FILE *f;
{
  const char **fmt;

  fputs ("#include \"config.h\"\n", f);
  fputs ("#include \"system.h\"\n", f);
  fputs ("#include \"obstack.h\"\n", f);
  fputs ("#include \"rtl.h\"\n\n", f);
  fputs ("extern struct obstack *rtl_obstack;\n\n", f);
  fputs ("static rtx obstack_alloc_rtx PROTO((int length));\n", f);
  fputs ("static rtx obstack_alloc_rtx (length)\n", f);
  fputs ("     register int length;\n{\n", f);
  fputs ("  rtx rt = (rtx) obstack_alloc (rtl_obstack, length);\n\n", f);
  fputs ("  memset(rt, 0, sizeof(struct rtx_def) - sizeof(rtunion));\n\n", f);
  fputs ("  return rt;\n}\n\n", f);

  for (fmt = formats; *fmt; ++fmt)
    gendef (f, *fmt);
}

#if defined(USE_C_ALLOCA)
PTR
xmalloc (nbytes)
  size_t nbytes;
{
  register PTR tmp = (PTR) malloc (nbytes);

  if (!tmp)
    {
      fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n",
	       nbytes);
      exit (FATAL_EXIT_CODE);
    }

  return tmp;
}
#endif /* USE_C_ALLOCA */

int
main(argc, argv)
     int argc;
     char **argv;
{
  FILE *f;

  if (argc != 3)
    exit (1);

  find_formats ();

  f = fopen (argv[1], "w");
  if (f == NULL)
    {
      perror (argv[1]);
      exit (1);
    }
  genlegend (f);
  genheader (f);
  fclose (f);

  f = fopen (argv[2], "w");
  if (f == NULL)
    {
      perror (argv[2]);
      exit (1);
    }
  genlegend (f);
  gencode (f);
  fclose (f);

  exit (0);
}
Commit	Line	Data
3b80f6ca	1	/* Generate code to allocate RTL structures.
0133b7d9	2	Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
3b80f6ca RH	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 "hconfig.h"
b04cd507	23	#include "system.h"
3b80f6ca	24
3b80f6ca RH	25	#define NO_GENRTL_H
3b80f6ca RH	26	#include "rtl.h"
987009bf	27	#undef abort
3b80f6ca	28
aa0b4465 ZW	29	#include "real.h"
	30
	31	/* Calculate the format for CONST_DOUBLE. This depends on the relative
	32	widths of HOST_WIDE_INT and REAL_VALUE_TYPE.
	33	We only need to go out to e0wwww, since min(HOST_WIDE_INT)==32 and
	34	max(LONG_DOUBLE_TYPE_SIZE)==128.
	35	This is duplicated in rtl.c.
	36	A number of places assume that there are always at least two 'w'
	37	slots in a CONST_DOUBLE, so we provide them even if one would suffice. */
	38	#if HOST_BITS_PER_WIDE_INT >= LONG_DOUBLE_TYPE_SIZE
	39	#define CONST_DOUBLE_FORMAT "e0ww"
	40	#elif HOST_BITS_PER_WIDE_INT*2 >= LONG_DOUBLE_TYPE_SIZE
	41	#define CONST_DOUBLE_FORMAT "e0ww"
	42	#elif HOST_BITS_PER_WIDE_INT*3 >= LONG_DOUBLE_TYPE_SIZE
	43	#define CONST_DOUBLE_FORMAT "e0www"
	44	#elif HOST_BITS_PER_WIDE_INT*4 >= LONG_DOUBLE_TYPE_SIZE
	45	#define CONST_DOUBLE_FORMAT "e0wwww"
	46	#else
	47	#define CONST_DOUBLE_FORMAT /* nothing - will cause syntax error */
	48	#endif
	49
3b80f6ca RH	50
	51	struct rtx_definition
	52	{
	53	const char enumname, name, *format;
	54	};
	55
d4ba0ead	56	#define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { STRINGIFY(ENUM), NAME, FORMAT },
3b80f6ca RH	57
	58	struct rtx_definition defs[] =
	59	{
	60	#include "rtl.def" /* rtl expressions are documented here */
	61	};
	62
	63	const char *formats[NUM_RTX_CODE];
	64
fd97443c KG	65	static const char *type_from_format PROTO((int));
fd97443c KG	66	static const char *accessor_from_format PROTO((int));
56c0e996 BS	67	static int special_format PROTO((const char *));
	68	static int special_rtx PROTO((int));
	69	static void find_formats PROTO((void));
	70	static void gendecl PROTO((FILE , const char ));
	71	static void genmacro PROTO((FILE *, int));
	72	static void gendef PROTO((FILE , const char ));
	73	static void genlegend PROTO((FILE *));
	74	static void genheader PROTO((FILE *));
	75	static void gencode PROTO((FILE *));
	76
0133b7d9 RH	77	/* Decode a format letter into a C type string. */
0133b7d9 RH	78
3b80f6ca	79	static const char *
982255c8	80	type_from_format (c)
fd97443c	81	int c;
3b80f6ca RH	82	{
	83	switch (c)
	84	{
	85	case 'i':
	86	return "int";
	87	case 'w':
	88	return "HOST_WIDE_INT";
	89	case 's':
	90	return "char *";
	91	case 'e':
	92	case 'u':
	93	return "rtx";
	94	case 'E':
	95	return "rtvec";
0dfa1860	96	case 'b':
8f985ec4	97	return "struct bitmap_head_def "; / bitmap - typedef not available */
0dfa1860	98	case 't':
8f985ec4	99	return "union tree_node "; / tree - typedef not available */
3b80f6ca RH	100	default:
	101	abort ();
	102	}
	103	}
	104
0133b7d9 RH	105	/* Decode a format letter into the proper accessor function. */
0133b7d9 RH	106
3b80f6ca	107	static const char *
982255c8	108	accessor_from_format (c)
fd97443c	109	int c;
3b80f6ca RH	110	{
	111	switch (c)
	112	{
	113	case 'i':
	114	return "XINT";
	115	case 'w':
	116	return "XWINT";
	117	case 's':
	118	return "XSTR";
	119	case 'e':
	120	case 'u':
	121	return "XEXP";
	122	case 'E':
	123	return "XVEC";
0dfa1860 MM	124	case 'b':
	125	return "XBITMAP";
	126	case 't':
	127	return "XTREE";
3b80f6ca RH	128	default:
	129	abort ();
	130	}
	131	}
	132
0133b7d9 RH	133	/* Return true if a format character doesn't need normal processing. */
0133b7d9 RH	134
3b80f6ca RH	135	static int
	136	special_format (fmt)
	137	const char *fmt;
	138	{
	139	return (strchr (fmt, '*') != 0
	140	\|\| strchr (fmt, 'V') != 0
	141	\|\| strchr (fmt, 'S') != 0
	142	\|\| strchr (fmt, 'n') != 0);
	143	}
	144
0133b7d9 RH	145	/* Return true if an rtx requires special processing. */
0133b7d9 RH	146
3b80f6ca RH	147	static int
	148	special_rtx (idx)
	149	int idx;
	150	{
	151	return (strcmp (defs[idx].enumname, "CONST_INT") == 0
0133b7d9	152	\|\| strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0
41472af8 MM	153	\|\| strcmp (defs[idx].enumname, "REG") == 0
41472af8 MM	154	\|\| strcmp (defs[idx].enumname, "MEM") == 0);
3b80f6ca RH	155	}
3b80f6ca RH	156
0133b7d9 RH	157	/* Fill `formats' with all unique format strings. */
0133b7d9 RH	158
3b80f6ca RH	159	static void
	160	find_formats ()
	161	{
	162	int i;
	163
	164	for (i = 0; i < NUM_RTX_CODE; ++i)
	165	{
	166	const char **f;
	167
	168	if (special_format (defs[i].format))
	169	continue;
	170
	171	for (f = formats; *f ; ++f)
0133b7d9	172	if (! strcmp (*f, defs[i].format))
3b80f6ca RH	173	break;
	174
	175	if (!*f)
	176	*f = defs[i].format;
	177	}
	178	}
	179
0133b7d9 RH	180	/* Emit a prototype for the rtx generator for a format. */
0133b7d9 RH	181
3b80f6ca RH	182	static void
	183	gendecl (f, format)
	184	FILE *f;
	185	const char *format;
	186	{
	187	const char *p;
	188	int i;
	189
	190	fprintf (f, "extern rtx gen_rtx_fmt_%s PROTO((RTX_CODE, enum machine_mode mode",
	191	format);
	192	for (p = format, i = 0; *p ; ++p)
	193	if (*p != '0')
	194	fprintf (f, ", %s arg%d", type_from_format (*p), i++);
	195	fprintf (f, "));\n");
	196	}
	197
0133b7d9 RH	198	/* Emit a define mapping an rtx code to the generator for its format. */
0133b7d9 RH	199
3b80f6ca RH	200	static void
	201	genmacro (f, idx)
	202	FILE *f;
	203	int idx;
	204	{
	205	const char *p;
	206	int i;
	207
	208	fprintf (f, "#define gen_rtx_%s%s(mode",
	209	(special_rtx (idx) ? "raw_" : ""), defs[idx].enumname);
	210
	211	for (p = defs[idx].format, i = 0; *p ; ++p)
	212	if (*p != '0')
	213	fprintf (f, ", arg%d", i++);
	214	fprintf (f, ") ");
	215
	216	fprintf (f, "gen_rtx_fmt_%s(%s,(mode)", defs[idx].format, defs[idx].enumname);
	217	for (p = defs[idx].format, i = 0; *p ; ++p)
	218	if (*p != '0')
	219	fprintf (f, ",(arg%d)", i++);
	220	fprintf (f, ")\n");
	221	}
	222
0133b7d9 RH	223	/* Emit the implementation for the rtx generator for a format. */
0133b7d9 RH	224
3b80f6ca RH	225	static void
	226	gendef (f, format)
	227	FILE *f;
	228	const char *format;
	229	{
	230	const char *p;
	231	int i, j;
	232
	233	fprintf (f, "rtx\ngen_rtx_fmt_%s (code, mode", format);
	234	for (p = format, i = 0; *p ; ++p)
	235	if (*p != '0')
	236	fprintf (f, ", arg%d", i++);
	237
	238	fprintf (f, ")\n RTX_CODE code;\n enum machine_mode mode;\n");
	239	for (p = format, i = 0; *p ; ++p)
	240	if (*p != '0')
	241	fprintf (f, " %s arg%d;\n", type_from_format (*p), i++);
	242
	243	/* See rtx_alloc in rtl.c for comments. */
	244	fprintf (f, "{\n");
4b8140a6 JC	245	fprintf (f, " rtx rt = obstack_alloc_rtx (sizeof (struct rtx_def) + %d * sizeof (rtunion));\n",
4b8140a6 JC	246	(int) strlen (format) - 1);
3b80f6ca RH	247
	248	fprintf (f, " PUT_CODE (rt, code);\n");
	249	fprintf (f, " PUT_MODE (rt, mode);\n");
	250
	251	for (p = format, i = j = 0; *p ; ++p, ++i)
	252	if (*p != '0')
	253	{
	254	fprintf (f, " %s (rt, %d) = arg%d;\n",
	255	accessor_from_format (*p), i, j++);
	256	}
	257
	258	fprintf (f, "\n return rt;\n}\n\n");
	259	}
	260
0133b7d9 RH	261	/* Emit the `do not edit' banner. */
0133b7d9 RH	262
3b80f6ca RH	263	static void
	264	genlegend (f)
	265	FILE *f;
	266	{
0133b7d9 RH	267	fputs ("/* Generated automaticaly by the program `gengenrtl'\n", f);
0133b7d9 RH	268	fputs (" from the RTL description file `rtl.def' */\n\n", f);
3b80f6ca RH	269	}
3b80f6ca RH	270
0133b7d9 RH	271	/* Emit "genrtl.h". */
0133b7d9 RH	272
3b80f6ca RH	273	static void
	274	genheader (f)
	275	FILE *f;
	276	{
	277	int i;
	278	const char **fmt;
	279
	280	for (fmt = formats; *fmt; ++fmt)
	281	gendecl (f, *fmt);
	282
0133b7d9	283	fprintf (f, "\n");
3b80f6ca RH	284
	285	for (i = 0; i < NUM_RTX_CODE; i++)
	286	{
	287	if (special_format (defs[i].format))
	288	continue;
	289	genmacro (f, i);
	290	}
	291	}
	292
0133b7d9 RH	293	/* Emit "genrtl.c". */
0133b7d9 RH	294
3b80f6ca RH	295	static void
	296	gencode (f)
	297	FILE *f;
	298	{
	299	const char **fmt;
	300
4b8140a6	301	fputs ("#include \"config.h\"\n", f);
560bd19e	302	fputs ("#include \"system.h\"\n", f);
4b8140a6 JC	303	fputs ("#include \"obstack.h\"\n", f);
	304	fputs ("#include \"rtl.h\"\n\n", f);
	305	fputs ("extern struct obstack *rtl_obstack;\n\n", f);
	306	fputs ("static rtx obstack_alloc_rtx PROTO((int length));\n", f);
	307	fputs ("static rtx obstack_alloc_rtx (length)\n", f);
	308	fputs (" register int length;\n{\n", f);
	309	fputs (" rtx rt = (rtx) obstack_alloc (rtl_obstack, length);\n\n", f);
0133b7d9	310	fputs (" memset(rt, 0, sizeof(struct rtx_def) - sizeof(rtunion));\n\n", f);
4b8140a6	311	fputs (" return rt;\n}\n\n", f);
3b80f6ca RH	312
	313	for (fmt = formats; *fmt; ++fmt)
	314	gendef (f, *fmt);
	315	}
	316
402cdad5	317	#if defined(USE_C_ALLOCA)
2778b98d	318	PTR
982255c8	319	xmalloc (nbytes)
2778b98d	320	size_t nbytes;
982255c8	321	{
2778b98d	322	register PTR tmp = (PTR) malloc (nbytes);
982255c8 KG	323
	324	if (!tmp)
	325	{
402cdad5 RH	326	fprintf (stderr, "can't allocate %d bytes (out of virtual memory)\n",
402cdad5 RH	327	nbytes);
982255c8 KG	328	exit (FATAL_EXIT_CODE);
	329	}
	330
	331	return tmp;
	332	}
402cdad5	333	#endif /* USE_C_ALLOCA */
982255c8	334
3b80f6ca RH	335	int
	336	main(argc, argv)
	337	int argc;
	338	char **argv;
	339	{
	340	FILE *f;
	341
	342	if (argc != 3)
	343	exit (1);
	344
	345	find_formats ();
	346
	347	f = fopen (argv[1], "w");
	348	if (f == NULL)
	349	{
0133b7d9	350	perror (argv[1]);
3b80f6ca RH	351	exit (1);
	352	}
	353	genlegend (f);
	354	genheader (f);
0133b7d9	355	fclose (f);
3b80f6ca RH	356
	357	f = fopen (argv[2], "w");
	358	if (f == NULL)
	359	{
0133b7d9	360	perror (argv[2]);
3b80f6ca RH	361	exit (1);
	362	}
	363	genlegend (f);
	364	gencode (f);
0133b7d9	365	fclose (f);
3b80f6ca RH	366
	367	exit (0);
	368	}