[gcc.git] / gcc / config / vms / vms.c

/* Definitions of target machine GNU compiler. 32bit VMS version.
   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   Contributed by Douglas B Rupp (rupp@gnat.com).

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 3, 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 COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "vms-protos.h"
#include "ggc.h"
#include "target.h"
#include "output.h"
#include "tm.h"
#include "dwarf2out.h"

/* Correlation of standard CRTL names with DECCRTL function names.  */

/* Name is for a function that allocate memory.  Use the 64bit version
   if -mmalloc64.  */
#define VMS_CRTL_MALLOC	(1 << 0)

/* If long pointer are enabled, use _NAME64 instead.  */
#define VMS_CRTL_64	(1 << 1)

/* Prepend s/f before the name.  To be applied after the previous rule.
   use 's' for S float, 'f' for IEEE 32.  */
#define VMS_CRTL_FLOAT32  (1 << 2)

/* Prepend t/g/d before the name.  To be applied after the previous rule.
   use 'g' for VAX G float, 'd' for VAX D float, 't' for IEEE 64.  */
#define VMS_CRTL_FLOAT64  (1 << 3)

/* Prepend d before the name, only if using VAX fp.  */
#define VMS_CRTL_FLOAT64_VAXD  (1 << 4)

/* Prepend x before the name for if 128 bit long doubles are enabled.  This
   concern mostly 'printf'-like functions.  */
#define VMS_CRTL_FLOAT128 (1 << 5)

/* From xxx, create xxx, xxxf, xxxl using MATH$XXX_T, MATH$XXX_S
   and MATH$XXX{_X} if DPML is used.  */
#define VMS_CRTL_DPML (1 << 6)

/* Together with DPML, it means that all variant (ie xxx, xxxf and xxxl) are
   overridden by decc.  Without DPML, it means this is a variant (ie xxxf
   or xxxl) of a function.  */
#define VMS_CRTL_NODPML (1 << 7)

/* Prepend __bsd44_ before the name.  To be applied after the P64
   rule.  */
#define VMS_CRTL_BSD44	(1 << 8)

/* Define only in 32 bits mode, as this has no 64 bit variants.
   Concerns getopt/getarg.  */
#define VMS_CRTL_32ONLY (1 << 9)

/* GLobal data prefix (ga_, gl_...)  */
#define VMS_CRTL_G_MASK (7 << 10)
#define VMS_CRTL_G_NONE (0 << 10)
#define VMS_CRTL_GA	(1 << 10)
#define VMS_CRTL_GL	(2 << 10)

/* Append '_2'.  Not compatible with 64.  */
#define VMS_CRTL_FLOATV2 (1 << 13)

struct vms_crtl_name
{
  /* The standard C name.  */
  const char *const name;

  /* Flags to drive the translation.  */
  unsigned int flags;
};

/* Map for the translation.  */

static const struct vms_crtl_name vms_crtl_names[] =
  {
#include "vms-crtlmap.h"
  };

/* Number of entires in the above array.  */

#define NBR_CRTL_NAMES (sizeof (vms_crtl_names) / sizeof (*vms_crtl_names))

/* List of aliased identifiers.  They must be persistent across gc.  */

static GTY(()) VEC(tree,gc) *aliases_id;

/* Add a CRTL translation.  This simply use the transparent alias
   mechanism, which is platform independent and works with the
   #pragma extern_prefix (which set the assembler name).  */

static void
vms_add_crtl_xlat (const char *name, size_t nlen,
                   const char *id_str, size_t id_len)
{
  tree targ;

  /* printf ("vms crtl: %.*s -> %.*s\n", nlen, name, id_len, id_str); */

  targ = get_identifier_with_length (name, nlen);
  gcc_assert (!IDENTIFIER_TRANSPARENT_ALIAS (targ));
  IDENTIFIER_TRANSPARENT_ALIAS (targ) = 1;
  TREE_CHAIN (targ) = get_identifier_with_length (id_str, id_len);

  VEC_safe_push (tree, gc, aliases_id, targ);
}

/* Do VMS specific stuff on builtins: disable the ones that are not
   standard, mangle names.  */

void
vms_patch_builtins (void)
{
  /* enum built_in_function bi; */
  unsigned int i;

  /* Fwrite on VMS is non-standard.  */
  if (builtin_decl_implicit_p (BUILT_IN_FWRITE))
    set_builtin_decl_implicit_p (BUILT_IN_FWRITE, false);

  if (builtin_decl_implicit_p (BUILT_IN_FWRITE_UNLOCKED))
    set_builtin_decl_implicit_p (BUILT_IN_FWRITE_UNLOCKED, false);

  /* Define aliases for names.  */
  for (i = 0; i < NBR_CRTL_NAMES; i++)
    {
      const struct vms_crtl_name *n = &vms_crtl_names[i];
      char res[VMS_CRTL_MAXLEN + 3 + 9 + 1 + 1];
      int rlen;
      int nlen = strlen (n->name);

      /* Discard 32ONLY if using 64 bit pointers.  */
      if ((n->flags & VMS_CRTL_32ONLY)
	  && flag_vms_pointer_size == VMS_POINTER_SIZE_64)
	continue;

      /* Handle DPML unless overridden by decc.  */
      if ((n->flags & VMS_CRTL_DPML)
	  && !(n->flags & VMS_CRTL_NODPML))
	{
	  const char *p;
          char alt[VMS_CRTL_MAXLEN + 3];

	  memcpy (res, "MATH$", 5);
	  rlen = 5;
	  for (p = n->name; *p; p++)
	    res[rlen++] = TOUPPER (*p);
	  res[rlen++] = '_';
	  res[rlen++] = 'T';

	  /* Double version.  */
	  if (!(n->flags & VMS_CRTL_FLOAT64))
	    vms_add_crtl_xlat (n->name, nlen, res, rlen);

	  /* Float version.  */
	  res[rlen - 1] = 'S';
	  memcpy (alt, n->name, nlen);
	  alt[nlen] = 'f';
	  vms_add_crtl_xlat (alt, nlen + 1, res, rlen);

	  /* Long double version.  */
	  res[rlen - 1] = (LONG_DOUBLE_TYPE_SIZE == 128 ? 'X' : 'T');
	  alt[nlen] = 'l';
	  vms_add_crtl_xlat (alt, nlen + 1, res, rlen);

	  if (!(n->flags & (VMS_CRTL_FLOAT32 | VMS_CRTL_FLOAT64)))
	    continue;
	}

      if (n->flags & VMS_CRTL_FLOAT64_VAXD)
	continue;

      /* Add the dec-c prefix.  */
      memcpy (res, "decc$", 5);
      rlen = 5;

      if (n->flags & VMS_CRTL_BSD44)
        {
          memcpy (res + rlen, "__bsd44_", 8);
          rlen += 8;
        }

      if ((n->flags & VMS_CRTL_G_MASK) != VMS_CRTL_G_NONE)
        {
	  res[rlen++] = 'g';
	  switch (n->flags & VMS_CRTL_G_MASK)
	    {
	    case VMS_CRTL_GA:
	      res[rlen++] = 'a';
	      break;
	    case VMS_CRTL_GL:
	      res[rlen++] = 'l';
	      break;
	    default:
	      gcc_unreachable ();
	    }
	  res[rlen++] = '_';
        }

      if (n->flags & VMS_CRTL_FLOAT32)
        res[rlen++] = 'f';

      if (n->flags & VMS_CRTL_FLOAT64)
        res[rlen++] = 't';

      if ((n->flags & VMS_CRTL_FLOAT128) && LONG_DOUBLE_TYPE_SIZE == 128)
        res[rlen++] = 'x';

      memcpy (res + rlen, n->name, nlen);

      if ((n->flags & VMS_CRTL_64) == 0)
	{
	  rlen += nlen;

	  if (n->flags & VMS_CRTL_FLOATV2)
	    {
	      res[rlen++] = '_';
	      res[rlen++] = '2';
	    }
	  vms_add_crtl_xlat (n->name, nlen, res, rlen);
	}
      else
        {
          char alt[VMS_CRTL_MAXLEN + 3];
          bool use_64;

          /* Add three translations:
             _X32 -> X
             _X64 -> _X64
             X -> X if short, _X64 if long.  */
          alt[0] = '_';
          memcpy (alt + 1, n->name, nlen);
          alt[1 + nlen + 0] = '3';
          alt[1 + nlen + 1] = '2';
          alt[1 + nlen + 2] = 0;
          vms_add_crtl_xlat (alt, nlen + 3, res, rlen + nlen);

          use_64 = (((n->flags & VMS_CRTL_64)
                     && flag_vms_pointer_size == VMS_POINTER_SIZE_64)
                    || ((n->flags & VMS_CRTL_MALLOC)
                        && flag_vms_malloc64
                        && flag_vms_pointer_size != VMS_POINTER_SIZE_NONE));
          if (!use_64)
            vms_add_crtl_xlat (n->name, nlen, res, rlen + nlen);

          res[rlen++] = '_';
          memcpy (res + rlen, n->name, nlen);
          res[rlen + nlen + 0] = '6';
          res[rlen + nlen + 1] = '4';

          if (use_64)
            vms_add_crtl_xlat (n->name, nlen, res, rlen + nlen + 2);

          alt[1 + nlen + 0] = '6';
          alt[1 + nlen + 1] = '4';
          vms_add_crtl_xlat (alt, nlen + 3, res, rlen + nlen + 2);
        }
    }
}

/* Always default to .text section.  */

section *
vms_function_section (tree decl ATTRIBUTE_UNUSED,
                      enum node_frequency freq ATTRIBUTE_UNUSED,
                      bool startup ATTRIBUTE_UNUSED,
                      bool exit ATTRIBUTE_UNUSED)
{
  return NULL;
}

/* Additionnal VMS specific code for start_function.  */

/* Must be kept in sync with libgcc/config/vms/vms-ucrt0.c  */
#define VMS_MAIN_FLAGS_SYMBOL "__gcc_main_flags"
#define MAIN_FLAG_64BIT (1 << 0)
#define MAIN_FLAG_POSIX (1 << 1)

void
vms_start_function (const char *fnname)
{
#if VMS_DEBUGGING_INFO
  if (vms_debug_main
      && debug_info_level > DINFO_LEVEL_NONE
      && strncmp (vms_debug_main, fnname, strlen (vms_debug_main)) == 0)
    {
      targetm.asm_out.globalize_label (asm_out_file, VMS_DEBUG_MAIN_POINTER);
      ASM_OUTPUT_DEF (asm_out_file, VMS_DEBUG_MAIN_POINTER, fnname);
      dwarf2out_vms_debug_main_pointer ();
      vms_debug_main = 0;
    }
#endif

  /* Registers flags used for function main.  This is necessary for
     crt0 code.  */
  if (strcmp (fnname, "main") == 0)
    {
      unsigned int flags = 0;

      if (flag_vms_pointer_size == VMS_POINTER_SIZE_64)
	flags |= MAIN_FLAG_64BIT;
      if (!flag_vms_return_codes)
	flags |= MAIN_FLAG_POSIX;

      targetm.asm_out.globalize_label (asm_out_file, VMS_MAIN_FLAGS_SYMBOL);
      assemble_name (asm_out_file, VMS_MAIN_FLAGS_SYMBOL);
      fprintf (asm_out_file, " = %u\n", flags);
    }
}

#include "gt-vms.h"
Commit	Line	Data
db8b22ef TG	1	/* Definitions of target machine GNU compiler. 32bit VMS version.
	2	Copyright (C) 2009, 2010 Free Software Foundation, Inc.
	3	Contributed by Douglas B Rupp (rupp@gnat.com).
	4
	5	This file is part of GCC.
	6
	7	GCC is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3, or (at your option)
	10	any later version.
	11
	12	GCC is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with GCC; see the file COPYING3. If not see
	19	<http://www.gnu.org/licenses/>. */
	20
	21	#include "config.h"
	22	#include "system.h"
	23	#include "coretypes.h"
	24	#include "tree.h"
	25	#include "vms-protos.h"
db8b22ef	26	#include "ggc.h"
4b12e93d TG	27	#include "target.h"
4b12e93d TG	28	#include "output.h"
b9268e55 TG	29	#include "tm.h"
b9268e55 TG	30	#include "dwarf2out.h"
db8b22ef TG	31
	32	/* Correlation of standard CRTL names with DECCRTL function names. */
	33
	34	/* Name is for a function that allocate memory. Use the 64bit version
	35	if -mmalloc64. */
	36	#define VMS_CRTL_MALLOC (1 << 0)
	37
	38	/* If long pointer are enabled, use _NAME64 instead. */
	39	#define VMS_CRTL_64 (1 << 1)
	40
b9268e55 TG	41	/* Prepend s/f before the name. To be applied after the previous rule.
	42	use 's' for S float, 'f' for IEEE 32. */
	43	#define VMS_CRTL_FLOAT32 (1 << 2)
db8b22ef	44
b9268e55 TG	45	/* Prepend t/g/d before the name. To be applied after the previous rule.
	46	use 'g' for VAX G float, 'd' for VAX D float, 't' for IEEE 64. */
	47	#define VMS_CRTL_FLOAT64 (1 << 3)
	48
	49	/* Prepend d before the name, only if using VAX fp. */
	50	#define VMS_CRTL_FLOAT64_VAXD (1 << 4)
db8b22ef	51
17a27c59 TG	52	/* Prepend x before the name for if 128 bit long doubles are enabled. This
17a27c59 TG	53	concern mostly 'printf'-like functions. */
b9268e55 TG	54	#define VMS_CRTL_FLOAT128 (1 << 5)
	55
	56	/* From xxx, create xxx, xxxf, xxxl using MATH$XXX_T, MATH$XXX_S
	57	and MATH$XXX{_X} if DPML is used. */
	58	#define VMS_CRTL_DPML (1 << 6)
db8b22ef	59
b9268e55 TG	60	/* Together with DPML, it means that all variant (ie xxx, xxxf and xxxl) are
	61	overridden by decc. Without DPML, it means this is a variant (ie xxxf
	62	or xxxl) of a function. */
	63	#define VMS_CRTL_NODPML (1 << 7)
	64
	65	/* Prepend __bsd44_ before the name. To be applied after the P64
	66	rule. */
	67	#define VMS_CRTL_BSD44 (1 << 8)
	68
	69	/* Define only in 32 bits mode, as this has no 64 bit variants.
	70	Concerns getopt/getarg. */
	71	#define VMS_CRTL_32ONLY (1 << 9)
	72
	73	/* GLobal data prefix (ga_, gl_...) */
	74	#define VMS_CRTL_G_MASK (7 << 10)
	75	#define VMS_CRTL_G_NONE (0 << 10)
	76	#define VMS_CRTL_GA (1 << 10)
	77	#define VMS_CRTL_GL (2 << 10)
	78
	79	/* Append '_2'. Not compatible with 64. */
	80	#define VMS_CRTL_FLOATV2 (1 << 13)
7481209d	81
db8b22ef TG	82	struct vms_crtl_name
	83	{
	84	/* The standard C name. */
	85	const char *const name;
	86
	87	/* Flags to drive the translation. */
	88	unsigned int flags;
	89	};
	90
	91	/* Map for the translation. */
	92
	93	static const struct vms_crtl_name vms_crtl_names[] =
	94	{
	95	#include "vms-crtlmap.h"
	96	};
	97
	98	/* Number of entires in the above array. */
	99
	100	#define NBR_CRTL_NAMES (sizeof (vms_crtl_names) / sizeof (*vms_crtl_names))
	101
073a8998	102	/* List of aliased identifiers. They must be persistent across gc. */
db8b22ef TG	103
	104	static GTY(()) VEC(tree,gc) *aliases_id;
	105
	106	/* Add a CRTL translation. This simply use the transparent alias
073a8998	107	mechanism, which is platform independent and works with the
db8b22ef TG	108	#pragma extern_prefix (which set the assembler name). */
	109
	110	static void
	111	vms_add_crtl_xlat (const char *name, size_t nlen,
	112	const char *id_str, size_t id_len)
	113	{
	114	tree targ;
	115
b9268e55 TG	116	/* printf ("vms crtl: %.s -> %.s\n", nlen, name, id_len, id_str); */
b9268e55 TG	117
db8b22ef TG	118	targ = get_identifier_with_length (name, nlen);
	119	gcc_assert (!IDENTIFIER_TRANSPARENT_ALIAS (targ));
	120	IDENTIFIER_TRANSPARENT_ALIAS (targ) = 1;
	121	TREE_CHAIN (targ) = get_identifier_with_length (id_str, id_len);
	122
	123	VEC_safe_push (tree, gc, aliases_id, targ);
db8b22ef TG	124	}
	125
	126	/* Do VMS specific stuff on builtins: disable the ones that are not
	127	standard, mangle names. */
	128
	129	void
	130	vms_patch_builtins (void)
	131	{
	132	/* enum built_in_function bi; */
	133	unsigned int i;
	134
	135	/* Fwrite on VMS is non-standard. */
2acb1a01 TG	136	if (builtin_decl_implicit_p (BUILT_IN_FWRITE))
2acb1a01 TG	137	set_builtin_decl_implicit_p (BUILT_IN_FWRITE, false);
e79983f4	138
2acb1a01 TG	139	if (builtin_decl_implicit_p (BUILT_IN_FWRITE_UNLOCKED))
2acb1a01 TG	140	set_builtin_decl_implicit_p (BUILT_IN_FWRITE_UNLOCKED, false);
db8b22ef TG	141
	142	/* Define aliases for names. */
	143	for (i = 0; i < NBR_CRTL_NAMES; i++)
	144	{
	145	const struct vms_crtl_name *n = &vms_crtl_names[i];
	146	char res[VMS_CRTL_MAXLEN + 3 + 9 + 1 + 1];
	147	int rlen;
b9268e55 TG	148	int nlen = strlen (n->name);
	149
	150	/* Discard 32ONLY if using 64 bit pointers. */
	151	if ((n->flags & VMS_CRTL_32ONLY)
	152	&& flag_vms_pointer_size == VMS_POINTER_SIZE_64)
	153	continue;
	154
	155	/* Handle DPML unless overridden by decc. */
	156	if ((n->flags & VMS_CRTL_DPML)
	157	&& !(n->flags & VMS_CRTL_NODPML))
	158	{
	159	const char *p;
	160	char alt[VMS_CRTL_MAXLEN + 3];
	161
	162	memcpy (res, "MATH$", 5);
	163	rlen = 5;
	164	for (p = n->name; *p; p++)
	165	res[rlen++] = TOUPPER (*p);
	166	res[rlen++] = '_';
	167	res[rlen++] = 'T';
	168
	169	/* Double version. */
	170	if (!(n->flags & VMS_CRTL_FLOAT64))
	171	vms_add_crtl_xlat (n->name, nlen, res, rlen);
	172
	173	/* Float version. */
	174	res[rlen - 1] = 'S';
	175	memcpy (alt, n->name, nlen);
	176	alt[nlen] = 'f';
	177	vms_add_crtl_xlat (alt, nlen + 1, res, rlen);
	178
	179	/* Long double version. */
	180	res[rlen - 1] = (LONG_DOUBLE_TYPE_SIZE == 128 ? 'X' : 'T');
	181	alt[nlen] = 'l';
	182	vms_add_crtl_xlat (alt, nlen + 1, res, rlen);
	183
	184	if (!(n->flags & (VMS_CRTL_FLOAT32 \| VMS_CRTL_FLOAT64)))
	185	continue;
	186	}
	187
	188	if (n->flags & VMS_CRTL_FLOAT64_VAXD)
	189	continue;
db8b22ef TG	190
	191	/* Add the dec-c prefix. */
	192	memcpy (res, "decc$", 5);
	193	rlen = 5;
	194
	195	if (n->flags & VMS_CRTL_BSD44)
	196	{
b9268e55 TG	197	memcpy (res + rlen, "__bsd44_", 8);
b9268e55 TG	198	rlen += 8;
db8b22ef TG	199	}
db8b22ef TG	200
b9268e55	201	if ((n->flags & VMS_CRTL_G_MASK) != VMS_CRTL_G_NONE)
7481209d	202	{
b9268e55 TG	203	res[rlen++] = 'g';
	204	switch (n->flags & VMS_CRTL_G_MASK)
	205	{
	206	case VMS_CRTL_GA:
	207	res[rlen++] = 'a';
	208	break;
	209	case VMS_CRTL_GL:
	210	res[rlen++] = 'l';
	211	break;
	212	default:
	213	gcc_unreachable ();
	214	}
	215	res[rlen++] = '_';
7481209d TG	216	}
7481209d TG	217
b9268e55 TG	218	if (n->flags & VMS_CRTL_FLOAT32)
	219	res[rlen++] = 'f';
	220
	221	if (n->flags & VMS_CRTL_FLOAT64)
db8b22ef TG	222	res[rlen++] = 't';
db8b22ef TG	223
b9268e55	224	if ((n->flags & VMS_CRTL_FLOAT128) && LONG_DOUBLE_TYPE_SIZE == 128)
db8b22ef TG	225	res[rlen++] = 'x';
db8b22ef TG	226
db8b22ef TG	227	memcpy (res + rlen, n->name, nlen);
	228
	229	if ((n->flags & VMS_CRTL_64) == 0)
b9268e55 TG	230	{
	231	rlen += nlen;
	232
	233	if (n->flags & VMS_CRTL_FLOATV2)
	234	{
	235	res[rlen++] = '_';
	236	res[rlen++] = '2';
	237	}
	238	vms_add_crtl_xlat (n->name, nlen, res, rlen);
	239	}
db8b22ef TG	240	else
	241	{
	242	char alt[VMS_CRTL_MAXLEN + 3];
	243	bool use_64;
	244
	245	/* Add three translations:
	246	_X32 -> X
	247	_X64 -> _X64
	248	X -> X if short, _X64 if long. */
	249	alt[0] = '_';
	250	memcpy (alt + 1, n->name, nlen);
	251	alt[1 + nlen + 0] = '3';
	252	alt[1 + nlen + 1] = '2';
	253	alt[1 + nlen + 2] = 0;
	254	vms_add_crtl_xlat (alt, nlen + 3, res, rlen + nlen);
	255
d8aba32a TG	256	use_64 = (((n->flags & VMS_CRTL_64)
d8aba32a TG	257	&& flag_vms_pointer_size == VMS_POINTER_SIZE_64)
db8b22ef	258	\|\| ((n->flags & VMS_CRTL_MALLOC)
d8aba32a TG	259	&& flag_vms_malloc64
d8aba32a TG	260	&& flag_vms_pointer_size != VMS_POINTER_SIZE_NONE));
db8b22ef TG	261	if (!use_64)
	262	vms_add_crtl_xlat (n->name, nlen, res, rlen + nlen);
	263
	264	res[rlen++] = '_';
	265	memcpy (res + rlen, n->name, nlen);
	266	res[rlen + nlen + 0] = '6';
	267	res[rlen + nlen + 1] = '4';
	268
	269	if (use_64)
	270	vms_add_crtl_xlat (n->name, nlen, res, rlen + nlen + 2);
	271
	272	alt[1 + nlen + 0] = '6';
	273	alt[1 + nlen + 1] = '4';
	274	vms_add_crtl_xlat (alt, nlen + 3, res, rlen + nlen + 2);
	275	}
	276	}
	277	}
	278
916e8d27 TG	279	/* Always default to .text section. */
	280
	281	section *
	282	vms_function_section (tree decl ATTRIBUTE_UNUSED,
	283	enum node_frequency freq ATTRIBUTE_UNUSED,
	284	bool startup ATTRIBUTE_UNUSED,
	285	bool exit ATTRIBUTE_UNUSED)
	286	{
	287	return NULL;
	288	}
	289
4b12e93d TG	290	/* Additionnal VMS specific code for start_function. */
	291
	292	/* Must be kept in sync with libgcc/config/vms/vms-ucrt0.c */
	293	#define VMS_MAIN_FLAGS_SYMBOL "__gcc_main_flags"
	294	#define MAIN_FLAG_64BIT (1 << 0)
	295	#define MAIN_FLAG_POSIX (1 << 1)
	296
	297	void
	298	vms_start_function (const char *fnname)
	299	{
	300	#if VMS_DEBUGGING_INFO
	301	if (vms_debug_main
	302	&& debug_info_level > DINFO_LEVEL_NONE
	303	&& strncmp (vms_debug_main, fnname, strlen (vms_debug_main)) == 0)
	304	{
	305	targetm.asm_out.globalize_label (asm_out_file, VMS_DEBUG_MAIN_POINTER);
	306	ASM_OUTPUT_DEF (asm_out_file, VMS_DEBUG_MAIN_POINTER, fnname);
	307	dwarf2out_vms_debug_main_pointer ();
	308	vms_debug_main = 0;
	309	}
	310	#endif
	311
	312	/* Registers flags used for function main. This is necessary for
	313	crt0 code. */
	314	if (strcmp (fnname, "main") == 0)
	315	{
	316	unsigned int flags = 0;
	317
	318	if (flag_vms_pointer_size == VMS_POINTER_SIZE_64)
	319	flags \|= MAIN_FLAG_64BIT;
	320	if (!flag_vms_return_codes)
	321	flags \|= MAIN_FLAG_POSIX;
	322
	323	targetm.asm_out.globalize_label (asm_out_file, VMS_MAIN_FLAGS_SYMBOL);
	324	assemble_name (asm_out_file, VMS_MAIN_FLAGS_SYMBOL);
	325	fprintf (asm_out_file, " = %u\n", flags);
	326	}
	327	}
	328
db8b22ef	329	#include "gt-vms.h"