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

/* Definitions of target machine GNU compiler. 32bit VMS version.
   Copyright (C) 2009-2019 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/>.  */

#define IN_TARGET_CODE 1

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "target.h"
#include "tree.h"
#include "stringpool.h"
#include "alias.h"
#include "vms-protos.h"
#include "output.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, va_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 (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	1	/* Definitions of target machine GNU compiler. 32bit VMS version.
a5544970	2	Copyright (C) 2009-2019 Free Software Foundation, Inc.
db8b22ef TG	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
8fcc61f8 RS	21	#define IN_TARGET_CODE 1
8fcc61f8 RS	22
db8b22ef TG	23	#include "config.h"
	24	#include "system.h"
	25	#include "coretypes.h"
e11c4407	26	#include "target.h"
db8b22ef	27	#include "tree.h"
d8a2d370	28	#include "stringpool.h"
e11c4407	29	#include "alias.h"
db8b22ef	30	#include "vms-protos.h"
4b12e93d	31	#include "output.h"
b9268e55	32	#include "dwarf2out.h"
db8b22ef TG	33
	34	/* Correlation of standard CRTL names with DECCRTL function names. */
	35
	36	/* Name is for a function that allocate memory. Use the 64bit version
	37	if -mmalloc64. */
	38	#define VMS_CRTL_MALLOC (1 << 0)
	39
	40	/* If long pointer are enabled, use _NAME64 instead. */
	41	#define VMS_CRTL_64 (1 << 1)
	42
b9268e55 TG	43	/* Prepend s/f before the name. To be applied after the previous rule.
	44	use 's' for S float, 'f' for IEEE 32. */
	45	#define VMS_CRTL_FLOAT32 (1 << 2)
db8b22ef	46
b9268e55 TG	47	/* Prepend t/g/d before the name. To be applied after the previous rule.
	48	use 'g' for VAX G float, 'd' for VAX D float, 't' for IEEE 64. */
	49	#define VMS_CRTL_FLOAT64 (1 << 3)
	50
	51	/* Prepend d before the name, only if using VAX fp. */
	52	#define VMS_CRTL_FLOAT64_VAXD (1 << 4)
db8b22ef	53
17a27c59 TG	54	/* Prepend x before the name for if 128 bit long doubles are enabled. This
17a27c59 TG	55	concern mostly 'printf'-like functions. */
b9268e55 TG	56	#define VMS_CRTL_FLOAT128 (1 << 5)
	57
	58	/* From xxx, create xxx, xxxf, xxxl using MATH$XXX_T, MATH$XXX_S
	59	and MATH$XXX{_X} if DPML is used. */
	60	#define VMS_CRTL_DPML (1 << 6)
db8b22ef	61
b9268e55 TG	62	/* Together with DPML, it means that all variant (ie xxx, xxxf and xxxl) are
	63	overridden by decc. Without DPML, it means this is a variant (ie xxxf
	64	or xxxl) of a function. */
	65	#define VMS_CRTL_NODPML (1 << 7)
	66
	67	/* Prepend __bsd44_ before the name. To be applied after the P64
	68	rule. */
	69	#define VMS_CRTL_BSD44 (1 << 8)
	70
	71	/* Define only in 32 bits mode, as this has no 64 bit variants.
	72	Concerns getopt/getarg. */
	73	#define VMS_CRTL_32ONLY (1 << 9)
	74
	75	/* GLobal data prefix (ga_, gl_...) */
	76	#define VMS_CRTL_G_MASK (7 << 10)
	77	#define VMS_CRTL_G_NONE (0 << 10)
	78	#define VMS_CRTL_GA (1 << 10)
	79	#define VMS_CRTL_GL (2 << 10)
	80
	81	/* Append '_2'. Not compatible with 64. */
	82	#define VMS_CRTL_FLOATV2 (1 << 13)
7481209d	83
db8b22ef TG	84	struct vms_crtl_name
	85	{
	86	/* The standard C name. */
	87	const char *const name;
	88
	89	/* Flags to drive the translation. */
	90	unsigned int flags;
	91	};
	92
	93	/* Map for the translation. */
	94
	95	static const struct vms_crtl_name vms_crtl_names[] =
	96	{
	97	#include "vms-crtlmap.h"
	98	};
	99
	100	/* Number of entires in the above array. */
	101
	102	#define NBR_CRTL_NAMES (sizeof (vms_crtl_names) / sizeof (*vms_crtl_names))
	103
073a8998	104	/* List of aliased identifiers. They must be persistent across gc. */
db8b22ef	105
9771b263	106	static GTY(()) vec<tree, va_gc> *aliases_id;
db8b22ef TG	107
db8b22ef TG	108	/* Add a CRTL translation. This simply use the transparent alias
073a8998	109	mechanism, which is platform independent and works with the
db8b22ef TG	110	#pragma extern_prefix (which set the assembler name). */
	111
	112	static void
	113	vms_add_crtl_xlat (const char *name, size_t nlen,
	114	const char *id_str, size_t id_len)
	115	{
	116	tree targ;
	117
b9268e55 TG	118	/* printf ("vms crtl: %.s -> %.s\n", nlen, name, id_len, id_str); */
b9268e55 TG	119
db8b22ef TG	120	targ = get_identifier_with_length (name, nlen);
	121	gcc_assert (!IDENTIFIER_TRANSPARENT_ALIAS (targ));
	122	IDENTIFIER_TRANSPARENT_ALIAS (targ) = 1;
	123	TREE_CHAIN (targ) = get_identifier_with_length (id_str, id_len);
	124
9771b263	125	vec_safe_push (aliases_id, targ);
db8b22ef TG	126	}
	127
	128	/* Do VMS specific stuff on builtins: disable the ones that are not
	129	standard, mangle names. */
	130
	131	void
	132	vms_patch_builtins (void)
	133	{
	134	/* enum built_in_function bi; */
	135	unsigned int i;
	136
	137	/* Fwrite on VMS is non-standard. */
2acb1a01 TG	138	if (builtin_decl_implicit_p (BUILT_IN_FWRITE))
2acb1a01 TG	139	set_builtin_decl_implicit_p (BUILT_IN_FWRITE, false);
e79983f4	140
2acb1a01 TG	141	if (builtin_decl_implicit_p (BUILT_IN_FWRITE_UNLOCKED))
2acb1a01 TG	142	set_builtin_decl_implicit_p (BUILT_IN_FWRITE_UNLOCKED, false);
db8b22ef TG	143
	144	/* Define aliases for names. */
	145	for (i = 0; i < NBR_CRTL_NAMES; i++)
	146	{
	147	const struct vms_crtl_name *n = &vms_crtl_names[i];
	148	char res[VMS_CRTL_MAXLEN + 3 + 9 + 1 + 1];
	149	int rlen;
b9268e55 TG	150	int nlen = strlen (n->name);
	151
	152	/* Discard 32ONLY if using 64 bit pointers. */
	153	if ((n->flags & VMS_CRTL_32ONLY)
	154	&& flag_vms_pointer_size == VMS_POINTER_SIZE_64)
	155	continue;
	156
	157	/* Handle DPML unless overridden by decc. */
	158	if ((n->flags & VMS_CRTL_DPML)
	159	&& !(n->flags & VMS_CRTL_NODPML))
	160	{
	161	const char *p;
	162	char alt[VMS_CRTL_MAXLEN + 3];
	163
	164	memcpy (res, "MATH$", 5);
	165	rlen = 5;
	166	for (p = n->name; *p; p++)
	167	res[rlen++] = TOUPPER (*p);
	168	res[rlen++] = '_';
	169	res[rlen++] = 'T';
	170
	171	/* Double version. */
	172	if (!(n->flags & VMS_CRTL_FLOAT64))
	173	vms_add_crtl_xlat (n->name, nlen, res, rlen);
	174
	175	/* Float version. */
	176	res[rlen - 1] = 'S';
	177	memcpy (alt, n->name, nlen);
	178	alt[nlen] = 'f';
	179	vms_add_crtl_xlat (alt, nlen + 1, res, rlen);
	180
	181	/* Long double version. */
	182	res[rlen - 1] = (LONG_DOUBLE_TYPE_SIZE == 128 ? 'X' : 'T');
	183	alt[nlen] = 'l';
	184	vms_add_crtl_xlat (alt, nlen + 1, res, rlen);
	185
	186	if (!(n->flags & (VMS_CRTL_FLOAT32 \| VMS_CRTL_FLOAT64)))
	187	continue;
	188	}
	189
	190	if (n->flags & VMS_CRTL_FLOAT64_VAXD)
	191	continue;
db8b22ef TG	192
	193	/* Add the dec-c prefix. */
	194	memcpy (res, "decc$", 5);
	195	rlen = 5;
	196
	197	if (n->flags & VMS_CRTL_BSD44)
	198	{
b9268e55 TG	199	memcpy (res + rlen, "__bsd44_", 8);
b9268e55 TG	200	rlen += 8;
db8b22ef TG	201	}
db8b22ef TG	202
b9268e55	203	if ((n->flags & VMS_CRTL_G_MASK) != VMS_CRTL_G_NONE)
7481209d	204	{
b9268e55 TG	205	res[rlen++] = 'g';
	206	switch (n->flags & VMS_CRTL_G_MASK)
	207	{
	208	case VMS_CRTL_GA:
	209	res[rlen++] = 'a';
	210	break;
	211	case VMS_CRTL_GL:
	212	res[rlen++] = 'l';
	213	break;
	214	default:
	215	gcc_unreachable ();
	216	}
	217	res[rlen++] = '_';
7481209d TG	218	}
7481209d TG	219
b9268e55 TG	220	if (n->flags & VMS_CRTL_FLOAT32)
	221	res[rlen++] = 'f';
	222
	223	if (n->flags & VMS_CRTL_FLOAT64)
db8b22ef TG	224	res[rlen++] = 't';
db8b22ef TG	225
b9268e55	226	if ((n->flags & VMS_CRTL_FLOAT128) && LONG_DOUBLE_TYPE_SIZE == 128)
db8b22ef TG	227	res[rlen++] = 'x';
db8b22ef TG	228
db8b22ef TG	229	memcpy (res + rlen, n->name, nlen);
	230
	231	if ((n->flags & VMS_CRTL_64) == 0)
b9268e55 TG	232	{
	233	rlen += nlen;
	234
	235	if (n->flags & VMS_CRTL_FLOATV2)
	236	{
	237	res[rlen++] = '_';
	238	res[rlen++] = '2';
	239	}
	240	vms_add_crtl_xlat (n->name, nlen, res, rlen);
	241	}
db8b22ef TG	242	else
	243	{
	244	char alt[VMS_CRTL_MAXLEN + 3];
	245	bool use_64;
	246
	247	/* Add three translations:
	248	_X32 -> X
	249	_X64 -> _X64
	250	X -> X if short, _X64 if long. */
	251	alt[0] = '_';
	252	memcpy (alt + 1, n->name, nlen);
	253	alt[1 + nlen + 0] = '3';
	254	alt[1 + nlen + 1] = '2';
	255	alt[1 + nlen + 2] = 0;
	256	vms_add_crtl_xlat (alt, nlen + 3, res, rlen + nlen);
	257
d8aba32a TG	258	use_64 = (((n->flags & VMS_CRTL_64)
d8aba32a TG	259	&& flag_vms_pointer_size == VMS_POINTER_SIZE_64)
db8b22ef	260	\|\| ((n->flags & VMS_CRTL_MALLOC)
d8aba32a TG	261	&& flag_vms_malloc64
d8aba32a TG	262	&& flag_vms_pointer_size != VMS_POINTER_SIZE_NONE));
db8b22ef TG	263	if (!use_64)
	264	vms_add_crtl_xlat (n->name, nlen, res, rlen + nlen);
	265
	266	res[rlen++] = '_';
	267	memcpy (res + rlen, n->name, nlen);
	268	res[rlen + nlen + 0] = '6';
	269	res[rlen + nlen + 1] = '4';
	270
	271	if (use_64)
	272	vms_add_crtl_xlat (n->name, nlen, res, rlen + nlen + 2);
	273
	274	alt[1 + nlen + 0] = '6';
	275	alt[1 + nlen + 1] = '4';
	276	vms_add_crtl_xlat (alt, nlen + 3, res, rlen + nlen + 2);
	277	}
	278	}
	279	}
	280
916e8d27 TG	281	/* Always default to .text section. */
	282
	283	section *
	284	vms_function_section (tree decl ATTRIBUTE_UNUSED,
	285	enum node_frequency freq ATTRIBUTE_UNUSED,
	286	bool startup ATTRIBUTE_UNUSED,
	287	bool exit ATTRIBUTE_UNUSED)
	288	{
	289	return NULL;
	290	}
	291
4b12e93d TG	292	/* Additionnal VMS specific code for start_function. */
	293
	294	/* Must be kept in sync with libgcc/config/vms/vms-ucrt0.c */
	295	#define VMS_MAIN_FLAGS_SYMBOL "__gcc_main_flags"
	296	#define MAIN_FLAG_64BIT (1 << 0)
	297	#define MAIN_FLAG_POSIX (1 << 1)
	298
	299	void
	300	vms_start_function (const char *fnname)
	301	{
	302	#if VMS_DEBUGGING_INFO
	303	if (vms_debug_main
	304	&& debug_info_level > DINFO_LEVEL_NONE
	305	&& strncmp (vms_debug_main, fnname, strlen (vms_debug_main)) == 0)
	306	{
	307	targetm.asm_out.globalize_label (asm_out_file, VMS_DEBUG_MAIN_POINTER);
	308	ASM_OUTPUT_DEF (asm_out_file, VMS_DEBUG_MAIN_POINTER, fnname);
	309	dwarf2out_vms_debug_main_pointer ();
	310	vms_debug_main = 0;
	311	}
	312	#endif
	313
	314	/* Registers flags used for function main. This is necessary for
	315	crt0 code. */
	316	if (strcmp (fnname, "main") == 0)
	317	{
	318	unsigned int flags = 0;
	319
	320	if (flag_vms_pointer_size == VMS_POINTER_SIZE_64)
	321	flags \|= MAIN_FLAG_64BIT;
	322	if (!flag_vms_return_codes)
	323	flags \|= MAIN_FLAG_POSIX;
	324
	325	targetm.asm_out.globalize_label (asm_out_file, VMS_MAIN_FLAGS_SYMBOL);
	326	assemble_name (asm_out_file, VMS_MAIN_FLAGS_SYMBOL);
	327	fprintf (asm_out_file, " = %u\n", flags);
	328	}
	329	}
	330
db8b22ef	331	#include "gt-vms.h"