gas/config/obj-vms.c

/* vms.c -- Write out a VAX/VMS object file
   Copyright 1987, 1988, 1992, 1993, 1994, 1995, 1997, 1998, 2000, 2001
   Free Software Foundation, Inc.

This file is part of GAS, the GNU Assembler.

GAS 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.

GAS 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 GAS; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

/* Written by David L. Kashtan */
/* Modified by Eric Youngdale to write VMS debug records for program
   variables */

/* Want all of obj-vms.h (as obj-format.h, via targ-env.h, via as.h).  */
#define WANT_VMS_OBJ_DEFS

#include "as.h"
#include "config.h"
#include "subsegs.h"
#include "obstack.h"

/* What we do if there is a goof.  */
#define error as_fatal

#ifdef VMS			/* These are of no use if we are cross assembling.  */
#include <fab.h>		/* Define File Access Block	  */
#include <nam.h>		/* Define NAM Block		  */
#include <xab.h>		/* Define XAB - all different types*/
extern int sys$open(), sys$close(), sys$asctim();
#endif

/*
 *	Version string of the compiler that produced the code we are
 *	assembling.  (And this assembler, if we do not have compiler info.)
 */
char *compiler_version_string;

extern int flag_hash_long_names;	/* -+ */
extern int flag_one;			/* -1; compatibility with gcc 1.x */
extern int flag_show_after_trunc;	/* -H */
extern int flag_no_hash_mixed_case;	/* -h NUM */

/* Flag that determines how we map names.  This takes several values, and
 * is set with the -h switch.  A value of zero implies names should be
 * upper case, and the presence of the -h switch inhibits the case hack.
 * No -h switch at all sets vms_name_mapping to 0, and allows case hacking.
 * A value of 2 (set with -h2) implies names should be
 * all lower case, with no case hack.  A value of 3 (set with -h3) implies
 * that case should be preserved.  */

/* If the -+ switch is given, then the hash is appended to any name that is
 * longer than 31 characters, regardless of the setting of the -h switch.
 */

char vms_name_mapping = 0;

static symbolS *Entry_Point_Symbol = 0;	/* Pointer to "_main" */

/*
 *	We augment the "gas" symbol structure with this
 */
struct VMS_Symbol
{
  struct VMS_Symbol *Next;
  symbolS *Symbol;
  int Size;
  int Psect_Index;
  int Psect_Offset;
};

struct VMS_Symbol *VMS_Symbols = 0;
struct VMS_Symbol *Ctors_Symbols = 0;
struct VMS_Symbol *Dtors_Symbols = 0;

/* We need this to keep track of the various input files, so that we can
 * give the debugger the correct source line.
 */

struct input_file
{
  struct input_file *next;
  struct input_file *same_file_fpnt;
  int file_number;
  int max_line;
  int min_line;
  int offset;
  char flag;
  char *name;
  symbolS *spnt;
};

static struct input_file *file_root = (struct input_file *) NULL;

/*
 * Styles of PSECTS (program sections) that we generate; just shorthand
 * to avoid lists of section attributes.  Used by VMS_Psect_Spec().
 */
enum ps_type
{
  ps_TEXT, ps_DATA, ps_COMMON, ps_CONST, ps_CTORS, ps_DTORS
};

/*
 * This enum is used to keep track of the various types of variables that
 * may be present.
 */

enum advanced_type
{
  BASIC, POINTER, ARRAY, ENUM, STRUCT, UNION, FUNCTION, VOID, ALIAS, UNKNOWN
};

/*
 * This structure contains the information from the stabs directives, and the
 * information is filled in by VMS_typedef_parse.  Everything that is needed
 * to generate the debugging record for a given symbol is present here.
 * This could be done more efficiently, using nested struct/unions, but for now
 * I am happy that it works.
 */
struct VMS_DBG_Symbol
{
  struct VMS_DBG_Symbol *next;
  /* description of what this is */
  enum advanced_type advanced;
  /* this record is for this type */
  int dbx_type;
  /* For advanced types this is the type referred to.  I.e., the type
     a pointer points to, or the type of object that makes up an
     array.  */
  int type2;
  /* Use this type when generating a variable def */
  int VMS_type;
  /* used for arrays - this will be present for all */
  int index_min;
  /* entries, but will be meaningless for non-arrays */
  int index_max;
  /* Size in bytes of the data type.  For an array, this is the size
     of one element in the array */
  int data_size;
  /* Number of the structure/union/enum - used for ref */
  int struc_numb;
};

#define SYMTYPLST_SIZE (1<<4)	/* 16; must be power of two */
#define SYMTYP_HASH(x) ((unsigned) (x) & (SYMTYPLST_SIZE-1))
struct VMS_DBG_Symbol *VMS_Symbol_type_list[SYMTYPLST_SIZE];

/*
 * We need this structure to keep track of forward references to
 * struct/union/enum that have not been defined yet.  When they are ultimately
 * defined, then we can go back and generate the TIR commands to make a back
 * reference.
 */

struct forward_ref
{
  struct forward_ref *next;
  int dbx_type;
  int struc_numb;
  char resolved;
};

struct forward_ref *f_ref_root = (struct forward_ref *) NULL;

/*
 * This routine is used to compare the names of certain types to various
 * fixed types that are known by the debugger.
 */
#define type_check(X)  !strcmp (symbol_name, X)

/*
 * This variable is used to keep track of the name of the symbol we are
 * working on while we are parsing the stabs directives.
 */
static const char *symbol_name;

/* We use this counter to assign numbers to all of the structures, unions
 * and enums that we define.  When we actually declare a variable to the
 * debugger, we can simply do it by number, rather than describing the
 * whole thing each time.
 */

static structure_count = 0;

/* This variable is used to indicate that we are making the last attempt to
   parse the stabs, and that we should define as much as we can, and ignore
   the rest */

static int final_pass;

/* This variable is used to keep track of the current structure number
 * for a given variable.  If this is < 0, that means that the structure
 * has not yet been defined to the debugger.  This is still cool, since
 * the VMS object language has ways of fixing things up after the fact,
 * so we just make a note of this, and generate fixups at the end.
 */
static int struct_number;

/* This is used to distinguish between D_float and G_float for telling
   the debugger about doubles.  gcc outputs the same .stabs regardless
   of whether -mg is used to select alternate doubles.  */

static int vax_g_doubles = 0;

/* Local symbol references (used to handle N_ABS symbols; gcc does not
   generate those, but they're possible with hand-coded assembler input)
   are always made relative to some particular environment.  If the current
   input has any such symbols, then we expect this to get incremented
   exactly once and end up having all of them be in environment #0.  */

static int Current_Environment = -1;

/* Every object file must specify an module name, which is also used by
   traceback records.  Set in Write_VMS_MHD_Records().  */

static char Module_Name[255+1];

/*
 * Variable descriptors are used tell the debugger the data types of certain
 * more complicated variables (basically anything involving a structure,
 * union, enum, array or pointer).  Some non-pointer variables of the
 * basic types that the debugger knows about do not require a variable
 * descriptor.
 *
 * Since it is impossible to have a variable descriptor longer than 128
 * bytes by virtue of the way that the VMS object language is set up,
 * it makes not sense to make the arrays any longer than this, or worrying
 * about dynamic sizing of the array.
 *
 * These are the arrays and counters that we use to build a variable
 * descriptor.
 */

#define MAX_DEBUG_RECORD 128
static char Local[MAX_DEBUG_RECORD];	/* buffer for variable descriptor */
static char Asuffix[MAX_DEBUG_RECORD];	/* buffer for array descriptor */
static int Lpnt;		/* index into Local */
static int Apoint;		/* index into Asuffix */
static char overflow;		/* flag to indicate we have written too much*/
static int total_len;		/* used to calculate the total length of variable
				descriptor plus array descriptor - used for len byte*/

/* Flag if we have told user about finding global constants in the text
   section.  */
static int gave_compiler_message = 0;

/*
 *	Global data (Object records limited to 512 bytes by VAX-11 "C" runtime)
 */
static int VMS_Object_File_FD;	/* File Descriptor for object file */
static char Object_Record_Buffer[512];	/* Buffer for object file records  */
static int Object_Record_Offset;/* Offset to end of data	   */
static int Current_Object_Record_Type;	/* Type of record in above	   */

/*
 *	Macros for moving data around.  Must work on big-endian systems.
 */
#ifdef VMS  /* These are more efficient for VMS->VMS systems */
#define COPY_LONG(dest,val)	( *(long *) (dest) = (val) )
#define COPY_SHORT(dest,val)	( *(short *) (dest) = (val) )
#else
#define COPY_LONG(dest,val)	md_number_to_chars ((dest), (val), 4)
#define COPY_SHORT(dest,val)	md_number_to_chars ((dest), (val), 2)
#endif
/*
 *	Macros for placing data into the object record buffer.
 */
#define PUT_LONG(val) \
	( COPY_LONG (&Object_Record_Buffer[Object_Record_Offset], (val)), \
	  Object_Record_Offset += 4 )

#define PUT_SHORT(val) \
	( COPY_SHORT (&Object_Record_Buffer[Object_Record_Offset], (val)), \
	  Object_Record_Offset += 2 )

#define PUT_CHAR(val) ( Object_Record_Buffer[Object_Record_Offset++] = (val) )

#define PUT_COUNTED_STRING(cp) do { \
			register const char *p = (cp); \
			PUT_CHAR ((char) strlen (p)); \
			while (*p) PUT_CHAR (*p++); } while (0)

/*
 *	Macro for determining if a Name has psect attributes attached
 *	to it.
 */
#define PSECT_ATTRIBUTES_STRING		"$$PsectAttributes_"
#define PSECT_ATTRIBUTES_STRING_LENGTH	18

#define HAS_PSECT_ATTRIBUTES(Name) \
		(strncmp ((*Name == '_' ? Name + 1 : Name), \
			  PSECT_ATTRIBUTES_STRING, \
			  PSECT_ATTRIBUTES_STRING_LENGTH) == 0)


 /* in: segT   out: N_TYPE bits */
const short seg_N_TYPE[] =
{
  N_ABS,
  N_TEXT,
  N_DATA,
  N_BSS,
  N_UNDF,			/* unknown */
  N_UNDF,			/* error */
  N_UNDF,			/* expression */
  N_UNDF,			/* debug */
  N_UNDF,			/* ntv */
  N_UNDF,			/* ptv */
  N_REGISTER,			/* register */
};

const segT N_TYPE_seg[N_TYPE + 2] =
{				/* N_TYPE == 0x1E = 32-2 */
  SEG_UNKNOWN,			/* N_UNDF == 0 */
  SEG_GOOF,
  SEG_ABSOLUTE,			/* N_ABS == 2 */
  SEG_GOOF,
  SEG_TEXT,			/* N_TEXT == 4 */
  SEG_GOOF,
  SEG_DATA,			/* N_DATA == 6 */
  SEG_GOOF,
  SEG_BSS,			/* N_BSS == 8 */
  SEG_GOOF,
  SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  SEG_REGISTER,			/* dummy N_REGISTER for regs = 30 */
  SEG_GOOF,
};


/* Local support routines which return a value.  */

static struct input_file *find_file PARAMS ((symbolS *));
static struct VMS_DBG_Symbol *find_symbol PARAMS ((int));
static symbolS *Define_Routine PARAMS ((symbolS *,int,symbolS *,int));

static char *cvt_integer PARAMS ((char *,int *));
static char *fix_name PARAMS ((char *));
static char *get_struct_name PARAMS ((char *));

static offsetT VMS_Initialized_Data_Size PARAMS ((symbolS *,unsigned));

static int VMS_TBT_Source_File PARAMS ((char *,int));
static int gen1 PARAMS ((struct VMS_DBG_Symbol *,int));
static int forward_reference PARAMS ((char *));
static int final_forward_reference PARAMS ((struct VMS_DBG_Symbol *));
static int VMS_typedef_parse PARAMS ((char *));
static int hash_string PARAMS ((const char *));
static int VMS_Psect_Spec PARAMS ((const char *,int,enum ps_type,
				   struct VMS_Symbol *));

/* Local support routines which don't directly return any value.  */

static void s_const PARAMS ((int));
static void Create_VMS_Object_File PARAMS ((void));
static void Flush_VMS_Object_Record_Buffer PARAMS ((void));
static void Set_VMS_Object_File_Record PARAMS ((int));
static void Close_VMS_Object_File PARAMS ((void));
static void vms_tir_stack_psect PARAMS ((int,int,int));
static void VMS_Store_Immediate_Data PARAMS ((const char *,int,int));
static void VMS_Set_Data PARAMS ((int,int,int,int));
static void VMS_Store_Struct PARAMS ((int));
static void VMS_Def_Struct PARAMS ((int));
static void VMS_Set_Struct PARAMS ((int));
static void VMS_TBT_Module_Begin PARAMS ((void));
static void VMS_TBT_Module_End PARAMS ((void));
static void VMS_TBT_Routine_Begin PARAMS ((symbolS *,int));
static void VMS_TBT_Routine_End PARAMS ((int,symbolS *));
static void VMS_TBT_Block_Begin PARAMS ((symbolS *,int,char *));
static void VMS_TBT_Block_End PARAMS ((valueT));
static void VMS_TBT_Line_PC_Correlation PARAMS ((int,int,int,int));
static void VMS_TBT_Source_Lines PARAMS ((int,int,int));
static void fpush PARAMS ((int,int));
static void rpush PARAMS ((int,int));
static void array_suffix PARAMS ((struct VMS_DBG_Symbol *));
static void new_forward_ref PARAMS ((int));
static void generate_suffix PARAMS ((struct VMS_DBG_Symbol *,int));
static void bitfield_suffix PARAMS ((struct VMS_DBG_Symbol *,int));
static void setup_basic_type PARAMS ((struct VMS_DBG_Symbol *));
static void VMS_DBG_record PARAMS ((struct VMS_DBG_Symbol *,int,int,char *));
static void VMS_local_stab_Parse PARAMS ((symbolS *));
static void VMS_stab_parse PARAMS ((symbolS *,int,int,int,int));
static void VMS_GSYM_Parse PARAMS ((symbolS *,int));
static void VMS_LCSYM_Parse PARAMS ((symbolS *,int));
static void VMS_STSYM_Parse PARAMS ((symbolS *,int));
static void VMS_RSYM_Parse PARAMS ((symbolS *,symbolS *,int));
static void VMS_LSYM_Parse PARAMS ((void));
static void Define_Local_Symbols PARAMS ((symbolS *,symbolS *,symbolS *,int));
static void Write_VMS_MHD_Records PARAMS ((void));
static void Write_VMS_EOM_Record PARAMS ((int,valueT));
static void VMS_Case_Hack_Symbol PARAMS ((const char *,char *));
static void VMS_Modify_Psect_Attributes PARAMS ((const char *,int *));
static void VMS_Global_Symbol_Spec PARAMS ((const char *,int,int,int));
static void VMS_Local_Environment_Setup PARAMS ((const char *));
static void VMS_Emit_Globalvalues PARAMS ((unsigned,unsigned,char *));
static void VMS_Procedure_Entry_Pt PARAMS ((char *,int,int,int));
static void VMS_Set_Psect PARAMS ((int,int,int));
static void VMS_Store_Repeated_Data PARAMS ((int,char *,int,int));
static void VMS_Store_PIC_Symbol_Reference PARAMS ((symbolS *,int,
						    int,int,int,int));
static void VMS_Fix_Indirect_Reference PARAMS ((int,int,fragS *,fragS *));

/* Support code which used to be inline within vms_write_object_file.  */
static void vms_fixup_text_section PARAMS ((unsigned,struct frag *,struct frag *));
static void synthesize_data_segment PARAMS ((unsigned,unsigned,struct frag *));
static void vms_fixup_data_section PARAMS ((unsigned,unsigned));
static void global_symbol_directory PARAMS ((unsigned,unsigned));
static void local_symbols_DST PARAMS ((symbolS *,symbolS *));
static void vms_build_DST PARAMS ((unsigned));
static void vms_fixup_xtors_section PARAMS ((struct VMS_Symbol *, int));


/* The following code defines the special types of pseudo-ops that we
   use with VMS.  */

unsigned char const_flag = IN_DEFAULT_SECTION;

static void
s_const (arg)
     int arg;	/* 3rd field from obj_pseudo_table[]; not needed here */
{
  /* Since we don't need `arg', use it as our scratch variable so that
     we won't get any "not used" warnings about it.  */
  arg = get_absolute_expression ();
  subseg_set (SEG_DATA, (subsegT) arg);
  const_flag = 1;
  demand_empty_rest_of_line ();
}

const pseudo_typeS obj_pseudo_table[] =
{
  {"const", s_const, 0},
  {0, 0, 0},
};				/* obj_pseudo_table */

/* Routine to perform RESOLVE_SYMBOL_REDEFINITION().  */

int
vms_resolve_symbol_redef (sym)
     symbolS *sym;
{
  /*
   *	If the new symbol is .comm AND it has a size of zero,
   *	we ignore it (i.e. the old symbol overrides it)
   */
  if (SEGMENT_TO_SYMBOL_TYPE ((int) now_seg) == (N_UNDF | N_EXT)
      && frag_now_fix () == 0)
    {
      as_warn (_("compiler emitted zero-size common symbol `%s' already defined"),
	       S_GET_NAME (sym));
      return 1;
    }
  /*
   *	If the old symbol is .comm and it has a size of zero,
   *	we override it with the new symbol value.
   */
  if (S_IS_EXTERNAL (sym) && S_IS_DEFINED (sym) && S_GET_VALUE (sym) == 0)
    {
      as_warn (_("compiler redefined zero-size common symbol `%s'"),
	       S_GET_NAME (sym));
      sym->sy_frag  = frag_now;
      S_SET_OTHER (sym, const_flag);
      S_SET_VALUE (sym, frag_now_fix ());
      /* Keep N_EXT bit.  */
      sym->sy_symbol.n_type |= SEGMENT_TO_SYMBOL_TYPE ((int) now_seg);
      return 1;
    }

  return 0;
}

/* `tc_frob_label' handler for colon(symbols.c), used to examine the
   dummy label(s) gcc inserts at the beginning of each file it generates.
   gcc 1.x put "gcc_compiled."; gcc 2.x (as of 2.7) puts "gcc2_compiled."
   and "__gnu_language_<name>" and possibly "__vax_<type>_doubles".  */

void
vms_check_for_special_label (symbolP)
symbolS *symbolP;
{
  /* Special labels only occur prior to explicit section directives.  */
  if ((const_flag & IN_DEFAULT_SECTION) != 0)
    {
      char *sym_name = S_GET_NAME (symbolP);

      if (*sym_name == '_')
	++sym_name;

      if (!strcmp (sym_name, "__vax_g_doubles"))
	vax_g_doubles = 1;
#if 0	/* not necessary */
      else if (!strcmp (sym_name, "__vax_d_doubles"))
	vax_g_doubles = 0;
#endif
#if 0	/* these are potential alternatives to tc-vax.c's md_parse_options() */
      else if (!strcmp (sym_name, "gcc_compiled."))
	flag_one = 1;
      else if (!strcmp (sym_name, "__gnu_language_cplusplus"))
	flag_hash_long_names = 1;
#endif
    }
  return;
}

void
obj_read_begin_hook ()
{
  return;
}

void
obj_crawl_symbol_chain (headers)
     object_headers *headers;
{
  symbolS *symbolP;
  symbolS **symbolPP;
  int symbol_number = 0;

  symbolPP = &symbol_rootP;	/* -> last symbol chain link.  */
  while ((symbolP = *symbolPP) != NULL)
    {
      resolve_symbol_value (symbolP, 1);

     /* OK, here is how we decide which symbols go out into the
	brave new symtab.  Symbols that do are:

	* symbols with no name (stabd's?)
	* symbols with debug info in their N_TYPE
	* symbols with \1 as their 3rd character (numeric labels)
	* "local labels" needed for PIC fixups

	Symbols that don't are:
	* symbols that are registers

	All other symbols are output.  We complain if a deleted
	symbol was marked external.  */

      if (!S_IS_REGISTER (symbolP))
	{
	  symbolP->sy_number = symbol_number++;
	  symbolP->sy_name_offset = 0;
	  symbolPP = &symbolP->sy_next;
	}
      else
	{
	  if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
	    {
	      as_bad (_("Local symbol %s never defined"), S_GET_NAME (symbolP));
	    }			/* oops.  */

	  /* Unhook it from the chain.  */
	  *symbolPP = symbol_next (symbolP);
	}			/* if this symbol should be in the output */

    }			/* for each symbol */

  H_SET_STRING_SIZE (headers, string_byte_count);
  H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
}				/* obj_crawl_symbol_chain() */


 /****** VMS OBJECT FILE HACKING ROUTINES *******/

/* Create the VMS object file.  */

static void
Create_VMS_Object_File ()
{
#if	defined(eunice) || !defined(VMS)
  VMS_Object_File_FD = creat (out_file_name, 0777, "var");
#else	/* eunice */
  VMS_Object_File_FD = creat (out_file_name, 0, "rfm=var",
			      "ctx=bin", "mbc=16", "deq=64", "fop=tef",
			      "shr=nil");
#endif	/* eunice */
  /* Deal with errors.  */
  if (VMS_Object_File_FD < 0)
    as_fatal (_("Couldn't create VMS object file \"%s\""), out_file_name);
  /* Initialize object file hacking variables.  */
  Object_Record_Offset = 0;
  Current_Object_Record_Type = -1;
}

/* Flush the object record buffer to the object file.  */

static void
Flush_VMS_Object_Record_Buffer ()
{
  /* If the buffer is empty, there's nothing to do.  */
  if (Object_Record_Offset == 0)
    return;

#ifndef VMS			/* For cross-assembly purposes.  */
  {
    char RecLen[2];

    /* "Variable-length record" files have a two byte length field
       prepended to each record.  It's normally out-of-band, and native
       VMS output will insert it automatically for this type of file.
       When cross-assembling, we must write it explicitly.  */
    md_number_to_chars (RecLen, Object_Record_Offset, 2);
    if (write (VMS_Object_File_FD, RecLen, 2) != 2)
      error (_("I/O error writing VMS object file (length prefix)"));
    /* We also need to force the actual record to be an even number of
       bytes.  For native output, that's automatic; when cross-assembling,
       pad with a NUL byte if length is odd.  Do so _after_ writing the
       pre-padded length.  Since our buffer is defined with even size,
       an odd offset implies that it has some room left.  */
    if ((Object_Record_Offset & 1) != 0)
      Object_Record_Buffer[Object_Record_Offset++] = '\0';
  }
#endif /* not VMS */

  /* Write the data to the file.  */
  if (write (VMS_Object_File_FD, Object_Record_Buffer, Object_Record_Offset)
      != Object_Record_Offset)
    error (_("I/O error writing VMS object file"));

  /* The buffer is now empty.  */
  Object_Record_Offset = 0;
}

/* Declare a particular type of object file record.  */

static void
Set_VMS_Object_File_Record (Type)
     int Type;
{
  /* If the type matches, we are done.  */
  if (Type == Current_Object_Record_Type)
    return;
  /* Otherwise: flush the buffer.  */
  Flush_VMS_Object_Record_Buffer ();
  /* Remember the new type.  */
  Current_Object_Record_Type = Type;
}

/* Close the VMS Object file.  */

static void
Close_VMS_Object_File ()
{
  /* Flush (should never be necessary) and reset saved record-type context.  */
  Set_VMS_Object_File_Record (-1);

#ifndef VMS			/* For cross-assembly purposes.  */
  {
    char RecLen[2];
    int minus_one = -1;

    /* Write a 2 byte record-length field of -1 into the file, which
       means end-of-block when read, hence end-of-file when occurring
       in the file's last block.  It is only needed for variable-length
       record files transferred to VMS as fixed-length record files
       (typical for binary FTP; NFS shouldn't need it, but it won't hurt).  */
    md_number_to_chars (RecLen, minus_one, 2);
    write (VMS_Object_File_FD, RecLen, 2);
  }
#else
    /* When written on a VMS system, the file header (cf inode) will record
       the actual end-of-file position and no inline marker is needed.  */
#endif

  close (VMS_Object_File_FD);
}


 /****** Text Information and Relocation routines ******/

/* Stack Psect base followed by signed, varying-sized offset.
   Common to several object records.  */

static void
vms_tir_stack_psect (Psect_Index, Offset, Force)
     int Psect_Index;
     int Offset;
     int Force;
{
  int psect_width, offset_width;

  psect_width = ((unsigned) Psect_Index > 255) ? 2 : 1;
  offset_width = (Force || Offset > 32767 || Offset < -32768) ? 4
		 : (Offset > 127 || Offset < -128) ? 2 : 1;
#define Sta_P(p,o) (((o)<<1) | ((p)-1))
  /* byte or word psect; byte, word, or longword offset */
  switch (Sta_P(psect_width,offset_width))
    {
      case Sta_P(1,1):	PUT_CHAR (TIR_S_C_STA_PB);
			PUT_CHAR ((char) (unsigned char) Psect_Index);
			PUT_CHAR ((char) Offset);
			break;
      case Sta_P(1,2):	PUT_CHAR (TIR_S_C_STA_PW);
			PUT_CHAR ((char) (unsigned char) Psect_Index);
			PUT_SHORT (Offset);
			break;
      case Sta_P(1,4):	PUT_CHAR (TIR_S_C_STA_PL);
			PUT_CHAR ((char) (unsigned char) Psect_Index);
			PUT_LONG (Offset);
			break;
      case Sta_P(2,1):	PUT_CHAR (TIR_S_C_STA_WPB);
			PUT_SHORT (Psect_Index);
			PUT_CHAR ((char) Offset);
			break;
      case Sta_P(2,2):	PUT_CHAR (TIR_S_C_STA_WPW);
			PUT_SHORT (Psect_Index);
			PUT_SHORT (Offset);
			break;
      case Sta_P(2,4):	PUT_CHAR (TIR_S_C_STA_WPL);
			PUT_SHORT (Psect_Index);
			PUT_LONG (Offset);
			break;
    }
#undef Sta_P
}

/* Store immediate data in current Psect.  */

static void
VMS_Store_Immediate_Data (Pointer, Size, Record_Type)
     const char *Pointer;
     int Size;
     int Record_Type;
{
  register int i;

  Set_VMS_Object_File_Record (Record_Type);
  /* We can only store as most 128 bytes at a time due to the way that
     TIR commands are encoded.  */
  while (Size > 0)
    {
      i = (Size > 128) ? 128 : Size;
      Size -= i;
      /* If we cannot accommodate this record, flush the buffer.  */
      if ((Object_Record_Offset + i + 1) >= sizeof Object_Record_Buffer)
	Flush_VMS_Object_Record_Buffer ();
      /* If the buffer is empty we must insert record type.  */
      if (Object_Record_Offset == 0)
	PUT_CHAR (Record_Type);
      /* Store the count.  The Store Immediate TIR command is implied by
         a negative command byte, and the length of the immediate data
         is abs(command_byte).  So, we write the negated length value.  */
      PUT_CHAR ((char) (-i & 0xff));
      /* Now store the data.  */
      while (--i >= 0)
	PUT_CHAR (*Pointer++);
    }
  /* Flush the buffer if it is more than 75% full.  */
  if (Object_Record_Offset > (sizeof (Object_Record_Buffer) * 3 / 4))
    Flush_VMS_Object_Record_Buffer ();
}

/* Make a data reference.  */

static void
VMS_Set_Data (Psect_Index, Offset, Record_Type, Force)
     int Psect_Index;
     int Offset;
     int Record_Type;
     int Force;
{
  Set_VMS_Object_File_Record (Record_Type);
  /* If the buffer is empty we must insert the record type.  */
  if (Object_Record_Offset == 0)
    PUT_CHAR (Record_Type);
  /* Stack the Psect base with its offset.  */
  vms_tir_stack_psect (Psect_Index, Offset, Force);
  /* Set relocation base.  */
  PUT_CHAR (TIR_S_C_STO_PIDR);
  /* Flush the buffer if it is more than 75% full.  */
  if (Object_Record_Offset > (sizeof (Object_Record_Buffer) * 3 / 4))
    Flush_VMS_Object_Record_Buffer ();
}

/* Make a debugger reference to a struct, union or enum.  */

static void
VMS_Store_Struct (Struct_Index)
     int Struct_Index;
{
  /* We are writing a debug record.  */
  Set_VMS_Object_File_Record (OBJ_S_C_DBG);
  /* If the buffer is empty we must insert the record type.  */
  if (Object_Record_Offset == 0)
    PUT_CHAR (OBJ_S_C_DBG);
  PUT_CHAR (TIR_S_C_STA_UW);
  PUT_SHORT (Struct_Index);
  PUT_CHAR (TIR_S_C_CTL_STKDL);
  PUT_CHAR (TIR_S_C_STO_L);
  /* Flush the buffer if it is more than 75% full.  */
  if (Object_Record_Offset > (sizeof (Object_Record_Buffer) * 3 / 4))
    Flush_VMS_Object_Record_Buffer ();
}

/* Make a debugger reference to partially define a struct, union or enum.  */

static void
VMS_Def_Struct (Struct_Index)
     int Struct_Index;
{
  /* We are writing a debug record.  */
  Set_VMS_Object_File_Record (OBJ_S_C_DBG);
  /* If the buffer is empty we must insert the record type.  */
  if (Object_Record_Offset == 0)
    PUT_CHAR (OBJ_S_C_DBG);
  PUT_CHAR (TIR_S_C_STA_UW);
  PUT_SHORT (Struct_Index);
  PUT_CHAR (TIR_S_C_CTL_DFLOC);
  /* Flush the buffer if it is more than 75% full.  */
  if (Object_Record_Offset > (sizeof (Object_Record_Buffer) * 3 / 4))
    Flush_VMS_Object_Record_Buffer ();
}

static void
VMS_Set_Struct (Struct_Index)
     int Struct_Index;
{				/* see previous functions for comments */
  Set_VMS_Object_File_Record (OBJ_S_C_DBG);
  if (Object_Record_Offset == 0)
    PUT_CHAR (OBJ_S_C_DBG);
  PUT_CHAR (TIR_S_C_STA_UW);
  PUT_SHORT (Struct_Index);
  PUT_CHAR (TIR_S_C_CTL_STLOC);
  if (Object_Record_Offset > (sizeof (Object_Record_Buffer) * 3 / 4))
    Flush_VMS_Object_Record_Buffer ();
}


 /****** Traceback Information routines ******/

/* Write the Traceback Module Begin record.  */

static void
VMS_TBT_Module_Begin ()
{
  register char *cp, *cp1;
  int Size;
  char Local[256];

  /* Arrange to store the data locally (leave room for size byte).  */
  cp = &Local[1];
  /* Begin module.  */
  *cp++ = DST_S_C_MODBEG;
  *cp++ = 0;		/* flags; not used */
  /*
   *	Language type == "C"
   *
   * (FIXME:  this should be based on the input...)
   */
  COPY_LONG (cp, DST_S_C_C);
  cp += 4;
  /* Store the module name.  */
  *cp++ = (char) strlen (Module_Name);
  cp1 = Module_Name;
  while (*cp1)
    *cp++ = *cp1++;
  /* Now we can store the record size.  */
  Size = (cp - Local);
  Local[0] = Size - 1;
  /* Put it into the object record.  */
  VMS_Store_Immediate_Data (Local, Size, OBJ_S_C_TBT);
}

/* Write the Traceback Module End record.  */

static void
VMS_TBT_Module_End ()
{
  char Local[2];

  /* End module.  */
  Local[0] = 1;
  Local[1] = DST_S_C_MODEND;
  /* Put it into the object record.  */
  VMS_Store_Immediate_Data (Local, 2, OBJ_S_C_TBT);
}

/* Write a Traceback Routine Begin record.  */

static void
VMS_TBT_Routine_Begin (symbolP, Psect)
     symbolS *symbolP;
     int Psect;
{
  register char *cp, *cp1;
  char *Name;
  int Offset;
  int Size;
  char Local[512];

  /* Strip the leading "_" from the name.  */
  Name = S_GET_NAME (symbolP);
  if (*Name == '_')
    Name++;
  /* Get the text psect offset.  */
  Offset = S_GET_VALUE (symbolP);
  /* Set the record size.  */
  Size = 1 + 1 + 4 + 1 + strlen (Name);
  Local[0] = Size;
  /* DST type "routine begin".  */
  Local[1] = DST_S_C_RTNBEG;
  /* Uses CallS/CallG.  */
  Local[2] = 0;
  /* Store the data so far.  */
  VMS_Store_Immediate_Data (Local, 3, OBJ_S_C_TBT);
  /* Make sure we are still generating a OBJ_S_C_TBT record.  */
  if (Object_Record_Offset == 0)
    PUT_CHAR (OBJ_S_C_TBT);
  /* Stack the address.  */
  vms_tir_stack_psect (Psect, Offset, 0);
  /* Store the data reference.  */
  PUT_CHAR (TIR_S_C_STO_PIDR);
  /* Store the counted string as data.  */
  cp = Local;
  cp1 = Name;
  Size = strlen (cp1) + 1;
  *cp++ = Size - 1;
  while (*cp1)
    *cp++ = *cp1++;
  VMS_Store_Immediate_Data (Local, Size, OBJ_S_C_TBT);
}

/* Write a Traceback Routine End record.

   We *must* search the symbol table to find the next routine, since the
   assember has a way of reassembling the symbol table OUT OF ORDER Thus
   the next routine in the symbol list is not necessarily the next one in
   memory.  For debugging to work correctly we must know the size of the
   routine.  */

static void
VMS_TBT_Routine_End (Max_Size, sp)
     int Max_Size;
     symbolS *sp;
{
  symbolS *symbolP;
  int Size = 0x7fffffff;
  char Local[16];
  valueT sym_value, sp_value = S_GET_VALUE (sp);

  for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
    {
      if (!S_IS_DEBUG (symbolP) && S_GET_TYPE (symbolP) == N_TEXT)
	{
	  if (*S_GET_NAME (symbolP) == 'L')
	    continue;
	  sym_value = S_GET_VALUE (symbolP);
	  if (sym_value > sp_value && sym_value < Size)
	    Size = sym_value;

	  /*
	   * Dummy labels like "gcc_compiled." should no longer reach here.
	   */
#if 0
	  else
	  /* check if gcc_compiled. has size of zero */
	  if (sym_value == sp_value &&
	      sp != symbolP &&
	      (!strcmp (S_GET_NAME (sp), "gcc_compiled.") ||
	       !strcmp (S_GET_NAME (sp), "gcc2_compiled.")))
	    Size = sym_value;
#endif
	}
    }
  if (Size == 0x7fffffff)
    Size = Max_Size;
  Size -= sp_value;		/* and get the size of the routine */
  /* Record Size.  */
  Local[0] = 6;
  /* DST type is "routine end".  */
  Local[1] = DST_S_C_RTNEND;
  Local[2] = 0;		/* unused */
  /* Size of routine.  */
  COPY_LONG (&Local[3], Size);
  /* Store the record.  */
  VMS_Store_Immediate_Data (Local, 7, OBJ_S_C_TBT);
}

/* Write a Traceback Block Begin record.  */

static void
VMS_TBT_Block_Begin (symbolP, Psect, Name)
     symbolS *symbolP;
     int Psect;
     char *Name;
{
  register char *cp, *cp1;
  int Offset;
  int Size;
  char Local[512];

  /* Set the record size.  */
  Size = 1 + 1 + 4 + 1 + strlen (Name);
  Local[0] = Size;
  /* DST type is "begin block"; we simulate with a phony routine.  */
  Local[1] = DST_S_C_BLKBEG;
  /* Uses CallS/CallG.  */
  Local[2] = 0;
  /* Store the data so far.  */
  VMS_Store_Immediate_Data (Local, 3, OBJ_S_C_DBG);
  /* Make sure we are still generating a debug record.  */
  if (Object_Record_Offset == 0)
    PUT_CHAR (OBJ_S_C_DBG);
  /* Now get the symbol address.  */
  PUT_CHAR (TIR_S_C_STA_WPL);
  PUT_SHORT (Psect);
  /* Get the text psect offset.  */
  Offset = S_GET_VALUE (symbolP);
  PUT_LONG (Offset);
  /* Store the data reference.  */
  PUT_CHAR (TIR_S_C_STO_PIDR);
  /* Store the counted string as data.  */
  cp = Local;
  cp1 = Name;
  Size = strlen (cp1) + 1;
  *cp++ = Size - 1;
  while (*cp1)
    *cp++ = *cp1++;
  VMS_Store_Immediate_Data (Local, Size, OBJ_S_C_DBG);
}

/* Write a Traceback Block End record.  */

static void
VMS_TBT_Block_End (Size)
     valueT Size;
{
  char Local[16];

  Local[0] = 6;		/* record length */
  /* DST type is "block end"; simulate with a phony end routine.  */
  Local[1] = DST_S_C_BLKEND;
  Local[2] = 0;		/* unused, must be zero */
  COPY_LONG (&Local[3], Size);
  VMS_Store_Immediate_Data (Local, 7, OBJ_S_C_DBG);
}


/* Write a Line number <-> Program Counter correlation record.  */

static void
VMS_TBT_Line_PC_Correlation (Line_Number, Offset, Psect, Do_Delta)
     int Line_Number;
     int Offset;
     int Psect;
     int Do_Delta;
{
  register char *cp;
  char Local[64];

  if (Do_Delta == 0)
    {
      /*
       *  If not delta, set our PC/Line number correlation.
       */
      cp = &Local[1];	/* Put size in Local[0] later.  */
      /* DST type is "Line Number/PC correlation".  */
      *cp++ = DST_S_C_LINE_NUM;
      /* Set Line number.  */
      if (Line_Number - 1 <= 255)
	{
	  *cp++ = DST_S_C_SET_LINUM_B;
	  *cp++ = (char) (Line_Number - 1);
	}
      else if (Line_Number - 1 <= 65535)
	{
	  *cp++ = DST_S_C_SET_LINE_NUM;
	  COPY_SHORT (cp, Line_Number - 1),  cp += 2;
	}
      else
	{
	  *cp++ = DST_S_C_SET_LINUM_L;
	  COPY_LONG (cp, Line_Number - 1),  cp += 4;
	}
      /* Set PC.  */
      *cp++ = DST_S_C_SET_ABS_PC;
      /* Store size now that we know it, then output the data.  */
      Local[0] = cp - &Local[1];
	/* Account for the space that TIR_S_C_STO_PIDR will use for the PC.  */
	Local[0] += 4;		/* size includes length of another longword */
      VMS_Store_Immediate_Data (Local, cp - Local, OBJ_S_C_TBT);
      /* Make sure we are still generating a OBJ_S_C_TBT record.  */
      if (Object_Record_Offset == 0)
	PUT_CHAR (OBJ_S_C_TBT);
      vms_tir_stack_psect (Psect, Offset, 0);
      PUT_CHAR (TIR_S_C_STO_PIDR);
      /* Do a PC offset of 0 to register the line number.  */
      Local[0] = 2;
      Local[1] = DST_S_C_LINE_NUM;
      Local[2] = 0;		/* Increment PC by 0 and register line # */
      VMS_Store_Immediate_Data (Local, 3, OBJ_S_C_TBT);
    }
  else
    {
      if (Do_Delta < 0)
	{
	  /*
	   *  When delta is negative, terminate the line numbers.
	   */
	  Local[0] = 1 + 1 + 4;
	  Local[1] = DST_S_C_LINE_NUM;
	  Local[2] = DST_S_C_TERM_L;
	  COPY_LONG (&Local[3], Offset);
	  VMS_Store_Immediate_Data (Local, 7, OBJ_S_C_TBT);
	  return;
	}
      /*
       *  Do a PC/Line delta.
       */
      cp = &Local[1];
      *cp++ = DST_S_C_LINE_NUM;
      if (Line_Number > 1)
	{
	  /* We need to increment the line number.  */
	  if (Line_Number - 1 <= 255)
	    {
	      *cp++ = DST_S_C_INCR_LINUM;
	      *cp++ = Line_Number - 1;
	    }
	  else if (Line_Number - 1 <= 65535)
	    {
	      *cp++ = DST_S_C_INCR_LINUM_W;
	      COPY_SHORT (cp, Line_Number - 1),  cp += 2;
	    }
	  else
	    {
	      *cp++ = DST_S_C_INCR_LINUM_L;
	      COPY_LONG (cp, Line_Number - 1),  cp += 4;
	    }
	}
      /*
       *	Increment the PC
       */
      if (Offset <= 128)
	{
	  /* Small offsets are encoded as negative numbers, rather than the
	     usual non-negative type code followed by another data field.  */
	  *cp++ = (char) -Offset;
	}
      else if (Offset <= 65535)
	{
	  *cp++ = DST_S_C_DELTA_PC_W;
	  COPY_SHORT (cp, Offset),  cp += 2;
	}
      else
	{
	  *cp++ = DST_S_C_DELTA_PC_L;
	  COPY_LONG (cp, Offset),  cp += 4;
	}
      /* Set size now that be know it, then output the data.  */
      Local[0] = cp - &Local[1];
      VMS_Store_Immediate_Data (Local, cp - Local, OBJ_S_C_TBT);
    }
}


/* Describe a source file to the debugger.  */

static int
VMS_TBT_Source_File (Filename, ID_Number)
     char *Filename;
     int ID_Number;
{
  register char *cp;
  int len, rfo, ffb, ebk;
  char cdt[8];
  char Local[512];
#ifdef VMS			/* Used for native assembly */
  unsigned Status;
  struct FAB fab;			/* RMS file access block */
  struct NAM nam;			/* file name information */
  struct XABDAT xabdat;			/* date+time fields */
  struct XABFHC xabfhc;			/* file header characteristics */
  char resultant_string_buffer[255 + 1];

  /*
   *	Set up RMS structures:
   */
  /* FAB -- file access block */
  memset ((char *) &fab, 0, sizeof fab);
  fab.fab$b_bid = FAB$C_BID;
  fab.fab$b_bln = (unsigned char) sizeof fab;
  fab.fab$l_fna = Filename;
  fab.fab$b_fns = (unsigned char) strlen (Filename);
  fab.fab$l_nam = (char *) &nam;
  fab.fab$l_xab = (char *) &xabdat;
  /* NAM -- file name block */
  memset ((char *) &nam, 0, sizeof nam);
  nam.nam$b_bid = NAM$C_BID;
  nam.nam$b_bln = (unsigned char) sizeof nam;
  nam.nam$l_rsa = resultant_string_buffer;
  nam.nam$b_rss = (unsigned char) (sizeof resultant_string_buffer - 1);
  /* XABs -- extended attributes blocks */
  memset ((char *) &xabdat, 0, sizeof xabdat);
  xabdat.xab$b_cod = XAB$C_DAT;
  xabdat.xab$b_bln = (unsigned char) sizeof xabdat;
  xabdat.xab$l_nxt = (char *) &xabfhc;
  memset ((char *) &xabfhc, 0, sizeof xabfhc);
  xabfhc.xab$b_cod = XAB$C_FHC;
  xabfhc.xab$b_bln = (unsigned char) sizeof xabfhc;
  xabfhc.xab$l_nxt = 0;
  /*
   *	Get the file information
   */
  Status = sys$open (&fab);
  if (!(Status & 1))
    {
      as_tsktsk (_("Couldn't find source file \"%s\", status=%%X%x"),
		 Filename, Status);
      return 0;
    }
  sys$close (&fab);
  /* Now extract fields of interest.  */
  memcpy (cdt, (char *) &xabdat.xab$q_cdt, 8);	/* creation date */
  ebk = xabfhc.xab$l_ebk;		/* end-of-file block */
  ffb = xabfhc.xab$w_ffb;		/* first free byte of last block */
  rfo = xabfhc.xab$b_rfo;		/* record format */
  len = nam.nam$b_rsl;			/* length of Filename */
  resultant_string_buffer[len] = '\0';
  Filename = resultant_string_buffer;	/* full filename */
#else				/* Cross-assembly */
  /* [Perhaps we ought to use actual values derived from stat() here?]  */
  memset (cdt, 0, 8);			/* null VMS quadword binary time */
  ebk = ffb = rfo = 0;
  len = strlen (Filename);
  if (len > 255)	/* a single byte is used as count prefix */
    {
      Filename += (len - 255);		/* tail end is more significant */
      len = 255;
    }
#endif /* VMS */

  cp = &Local[1];			/* fill in record length later */
  *cp++ = DST_S_C_SOURCE;		/* DST type is "source file" */
  *cp++ = DST_S_C_SRC_FORMFEED;		/* formfeeds count as source records */
  *cp++ = DST_S_C_SRC_DECLFILE;		/* declare source file */
  know (cp == &Local[4]);
  *cp++ = 0;				/* fill in this length below */
  *cp++ = 0;				/* flags; must be zero */
  COPY_SHORT (cp, ID_Number),  cp += 2;	/* file ID number */
  memcpy (cp, cdt, 8),  cp += 8;	/* creation date+time */
  COPY_LONG (cp, ebk),  cp += 4;	/* end-of-file block */
  COPY_SHORT (cp, ffb),  cp += 2;	/* first free byte of last block */
  *cp++ = (char) rfo;			/* RMS record format */
  /* Filename.  */
  *cp++ = (char) len;
  while (--len >= 0)
    *cp++ = *Filename++;
  /* Library module name (none).  */
  *cp++ = 0;
  /* Now that size is known, fill it in and write out the record.  */
  Local[4] = cp - &Local[5];		/* source file declaration size */
  Local[0] = cp - &Local[1];		/* TBT record size */
  VMS_Store_Immediate_Data (Local, cp - Local, OBJ_S_C_TBT);
  return 1;
}

/* Traceback information is described in terms of lines from compiler
   listing files, not lines from source files.  We need to set up the
   correlation between listing line numbers and source line numbers.
   Since gcc's .stabn directives refer to the source lines, we just
   need to describe a one-to-one correspondence.  */

static void
VMS_TBT_Source_Lines (ID_Number, Starting_Line_Number, Number_Of_Lines)
     int ID_Number;
     int Starting_Line_Number;
     int Number_Of_Lines;
{
  char *cp;
  int chunk_limit;
  char Local[128];	/* room enough to describe 1310700 lines...  */

  cp = &Local[1];	/* Put size in Local[0] later.  */
  *cp++ = DST_S_C_SOURCE;		/* DST type is "source file".  */
  *cp++ = DST_S_C_SRC_SETFILE;		/* Set Source File.  */
  COPY_SHORT (cp, ID_Number),  cp += 2;	/* File ID Number.  */
  /* Set record number and define lines.  Since no longword form of
     SRC_DEFLINES is available, we need to be able to cope with any huge
     files a chunk at a time.  It doesn't matter for tracebacks, since
     unspecified lines are mapped one-to-one and work out right, but it
     does matter within the debugger.  Without this explicit mapping,
     it will complain about lines not existing in the module.  */
  chunk_limit = (sizeof Local - 5) / 6;
  if (Number_Of_Lines > 65535 * chunk_limit)	/* avoid buffer overflow */
    Number_Of_Lines = 65535 * chunk_limit;
  while (Number_Of_Lines > 65535)
    {
      *cp++ = DST_S_C_SRC_SETREC_L;
      COPY_LONG (cp, Starting_Line_Number),  cp += 4;
      *cp++ = DST_S_C_SRC_DEFLINES_W;
      COPY_SHORT (cp, 65535),  cp += 2;
      Starting_Line_Number += 65535;
      Number_Of_Lines -= 65535;
    }
  /* Set record number and define lines, normal case.  */
  if (Starting_Line_Number <= 65535)
    {
      *cp++ = DST_S_C_SRC_SETREC_W;
      COPY_SHORT (cp, Starting_Line_Number),  cp += 2;
    }
  else
    {
      *cp++ = DST_S_C_SRC_SETREC_L;
      COPY_LONG (cp, Starting_Line_Number),  cp += 4;
    }
  *cp++ = DST_S_C_SRC_DEFLINES_W;
  COPY_SHORT (cp, Number_Of_Lines),  cp += 2;
  /* Set size now that be know it, then output the data.  */
  Local[0] = cp - &Local[1];
  VMS_Store_Immediate_Data (Local, cp - Local, OBJ_S_C_TBT);
}


 /****** Debugger Information support routines ******/

/* This routine locates a file in the list of files.  If an entry does
   not exist, one is created.  For include files, a new entry is always
   created such that inline functions can be properly debugged.  */

static struct input_file *
find_file (sp)
     symbolS *sp;
{
  struct input_file *same_file = 0;
  struct input_file *fpnt, *last = 0;
  char *sp_name;

  for (fpnt = file_root; fpnt; fpnt = fpnt->next)
    {
      if (fpnt->spnt == sp)
	return fpnt;
      last = fpnt;
    }
  sp_name = S_GET_NAME (sp);
  for (fpnt = file_root; fpnt; fpnt = fpnt->next)
    {
      if (strcmp (sp_name, fpnt->name) == 0)
	{
	  if (fpnt->flag == 1)
	    return fpnt;
	  same_file = fpnt;
	  break;
	}
    }
  fpnt = (struct input_file *) xmalloc (sizeof (struct input_file));
  if (!file_root)
    file_root = fpnt;
  else
    last->next = fpnt;
  fpnt->next = 0;
  fpnt->name = sp_name;
  fpnt->min_line = 0x7fffffff;
  fpnt->max_line = 0;
  fpnt->offset = 0;
  fpnt->flag = 0;
  fpnt->file_number = 0;
  fpnt->spnt = sp;
  fpnt->same_file_fpnt = same_file;
  return fpnt;
}

/* This routine converts a number string into an integer, and stops when
   it sees an invalid character.  The return value is the address of the
   character just past the last character read.  No error is generated.  */

static char *
cvt_integer (str, rtn)
     char *str;
     int *rtn;
{
  int ival = 0, sgn = 1;

  if (*str == '-')
    sgn = -1,  ++str;
  while (*str >= '0' && *str <= '9')
    ival = 10 * ival + *str++ - '0';
  *rtn = sgn * ival;
  return str;
}


/*
 * The following functions and definitions are used to generate object
 * records that will describe program variables to the VMS debugger.
 *
 * This file contains many of the routines needed to output debugging info
 * into the object file that the VMS debugger needs to understand symbols.
 * These routines are called very late in the assembly process, and thus
 * we can be fairly lax about changing things, since the GSD and the TIR
 * sections have already been output.
 */

/* This routine fixes the names that are generated by C++, ".this" is a good
   example.  The period does not work for the debugger, since it looks like
   the syntax for a structure element, and thus it gets mightily confused.

   We also use this to strip the PsectAttribute hack from the name before we
   write a debugger record.  */

static char *
fix_name (pnt)
     char *pnt;
{
  char *pnt1;

  /* Kill any leading "_".  */
  if (*pnt == '_')
    pnt++;

  /* Is there a Psect Attribute to skip??  */
  if (HAS_PSECT_ATTRIBUTES (pnt))
    {
      /* Yes: Skip it.  */
      pnt += PSECT_ATTRIBUTES_STRING_LENGTH;
      while (*pnt)
	{
	  if ((pnt[0] == '$') && (pnt[1] == '$'))
	    {
	      pnt += 2;
	      break;
	    }
	  pnt++;
	}
    }

  /* Here we fix the .this -> $this conversion.  */
  for (pnt1 = pnt; *pnt1 != 0; pnt1++)
    if (*pnt1 == '.')
      *pnt1 = '$';

  return pnt;
}

/* When defining a structure, this routine is called to find the name of
   the actual structure.  It is assumed that str points to the equal sign
   in the definition, and it moves backward until it finds the start of the
   name.  If it finds a 0, then it knows that this structure def is in the
   outermost level, and thus symbol_name points to the symbol name.  */

static char *
get_struct_name (str)
     char *str;
{
  char *pnt;
  pnt = str;
  while ((*pnt != ':') && (*pnt != '\0'))
    pnt--;
  if (*pnt == '\0')
    return (char *) symbol_name;
  *pnt-- = '\0';
  while ((*pnt != ';') && (*pnt != '='))
    pnt--;
  if (*pnt == ';')
    return pnt + 1;
  while ((*pnt < '0') || (*pnt > '9'))
    pnt++;
  while ((*pnt >= '0') && (*pnt <= '9'))
    pnt++;
  return pnt;
}

/* Search symbol list for type number dbx_type.
   Return a pointer to struct.  */

static struct VMS_DBG_Symbol *
find_symbol (dbx_type)
     int dbx_type;
{
  struct VMS_DBG_Symbol *spnt;

  spnt = VMS_Symbol_type_list[SYMTYP_HASH (dbx_type)];
  while (spnt)
    {
      if (spnt->dbx_type == dbx_type)
	break;
      spnt = spnt->next;
    }
  if (!spnt || spnt->advanced != ALIAS)
    return spnt;
  return find_symbol (spnt->type2);
}

#if 0		/* obsolete */
/* this routine puts info into either Local or Asuffix, depending on the sign
 * of size.  The reason is that it is easier to build the variable descriptor
 * backwards, while the array descriptor is best built forwards.  In the end
 * they get put together, if there is not a struct/union/enum along the way
 */
static void
push (value, size1)
     int value, size1;
{
  if (size1 < 0)
    {
      size1 = -size1;
      if (Lpnt < size1)
	{
	  overflow = 1;
	  Lpnt = 1;
	  return;
	}
      Lpnt -= size1;
      md_number_to_chars (&Local[Lpnt + 1], value, size1);
    }
  else
    {
      if (Apoint + size1 >= MAX_DEBUG_RECORD)
	{
	  overflow = 1;
	  Apoint = MAX_DEBUG_RECORD - 1;
	  return;
	}
      md_number_to_chars (&Asuffix[Apoint], value, size1);
      Apoint += size1;
    }
}
#endif

static void
fpush (value, size)
     int value, size;
{
  if (Apoint + size >= MAX_DEBUG_RECORD)
    {
      overflow = 1;
      Apoint = MAX_DEBUG_RECORD - 1;
      return;
    }
  if (size == 1)
    Asuffix[Apoint++] = (char) value;
  else
    {
      md_number_to_chars (&Asuffix[Apoint], value, size);
      Apoint += size;
    }
}

static void
rpush (value, size)
     int value, size;
{
  if (Lpnt < size)
    {
      overflow = 1;
      Lpnt = 1;
      return;
    }
  if (size == 1)
      Local[Lpnt--] = (char) value;
  else
    {
      Lpnt -= size;
      md_number_to_chars (&Local[Lpnt + 1], value, size);
    }
}

/* This routine generates the array descriptor for a given array.  */

static void
array_suffix (spnt2)
     struct VMS_DBG_Symbol *spnt2;
{
  struct VMS_DBG_Symbol *spnt;
  struct VMS_DBG_Symbol *spnt1;
  int rank;
  int total_size;

  rank = 0;
  spnt = spnt2;
  while (spnt->advanced != ARRAY)
    {
      spnt = find_symbol (spnt->type2);
      if (!spnt)
	return;
    }
  spnt1 = spnt;
  total_size = 1;
  while (spnt1->advanced == ARRAY)
    {
      rank++;
      total_size *= (spnt1->index_max - spnt1->index_min + 1);
      spnt1 = find_symbol (spnt1->type2);
    }
  total_size = total_size * spnt1->data_size;
  fpush (spnt1->data_size, 2);	/* element size */
  if (spnt1->VMS_type == DBG_S_C_ADVANCED_TYPE)
    fpush (0, 1);
  else
    fpush (spnt1->VMS_type, 1);	/* element type */
  fpush (DSC_K_CLASS_A, 1);	/* descriptor class */
  fpush (0, 4);			/* base address */
  fpush (0, 1);			/* scale factor -- not applicable */
  fpush (0, 1);			/* digit count -- not applicable */
  fpush (0xc0, 1);		/* flags: multiplier block & bounds present */
  fpush (rank, 1);		/* number of dimensions */
  fpush (total_size, 4);
  fpush (0, 4);			/* pointer to element [0][0]...[0] */
  spnt1 = spnt;
  while (spnt1->advanced == ARRAY)
    {
      fpush (spnt1->index_max - spnt1->index_min + 1, 4);
      spnt1 = find_symbol (spnt1->type2);
    }
  spnt1 = spnt;
  while (spnt1->advanced == ARRAY)
    {
      fpush (spnt1->index_min, 4);
      fpush (spnt1->index_max, 4);
      spnt1 = find_symbol (spnt1->type2);
    }
}

/* This routine generates the start of a variable descriptor based upon
   a struct/union/enum that has yet to be defined.  We define this spot as
   a new location, and save four bytes for the address.  When the struct is
   finally defined, then we can go back and plug in the correct address.  */

static void
new_forward_ref (dbx_type)
     int dbx_type;
{
  struct forward_ref *fpnt;
  fpnt = (struct forward_ref *) xmalloc (sizeof (struct forward_ref));
  fpnt->next = f_ref_root;
  f_ref_root = fpnt;
  fpnt->dbx_type = dbx_type;
  fpnt->struc_numb = ++structure_count;
  fpnt->resolved = 'N';
  rpush (DST_K_TS_IND, 1);	/* indirect type specification */
  total_len = 5;
  rpush (total_len, 2);
  struct_number = -fpnt->struc_numb;
}

/* This routine generates the variable descriptor used to describe non-basic
   variables.  It calls itself recursively until it gets to the bottom of it
   all, and then builds the descriptor backwards.  It is easiest to do it
   this way since we must periodically write length bytes, and it is easiest
   if we know the value when it is time to write it.  */

static int
gen1 (spnt, array_suffix_len)
     struct VMS_DBG_Symbol *spnt;
     int array_suffix_len;
{
  struct VMS_DBG_Symbol *spnt1;
  int i;

  switch (spnt->advanced)
    {
    case VOID:
      rpush (DBG_S_C_VOID, 1);
      total_len += 1;
      rpush (total_len, 2);
      return 0;
    case BASIC:
    case FUNCTION:
      if (array_suffix_len == 0)
	{
	  rpush (spnt->VMS_type, 1);
	  rpush (DBG_S_C_BASIC, 1);
	  total_len = 2;
	  rpush (total_len, 2);
	  return 1;
	}
      rpush (0, 4);
      rpush (DST_K_VFLAGS_DSC, 1);
      rpush (DST_K_TS_DSC, 1);	/* descriptor type specification */
      total_len = -2;
      return 1;
    case STRUCT:
    case UNION:
    case ENUM:
      struct_number = spnt->struc_numb;
      if (struct_number < 0)
	{
	  new_forward_ref (spnt->dbx_type);
	  return 1;
	}
      rpush (DBG_S_C_STRUCT, 1);
      total_len = 5;
      rpush (total_len, 2);
      return 1;
    case POINTER:
      spnt1 = find_symbol (spnt->type2);
      i = 1;
      if (!spnt1)
	new_forward_ref (spnt->type2);
      else
	i = gen1 (spnt1, 0);
      if (i)
	{	/* (*void) is a special case, do not put pointer suffix */
	  rpush (DBG_S_C_POINTER, 1);
	  total_len += 3;
	  rpush (total_len, 2);
	}
      return 1;
    case ARRAY:
      spnt1 = spnt;
      while (spnt1->advanced == ARRAY)
	{
	  spnt1 = find_symbol (spnt1->type2);
	  if (!spnt1)
	    {
	      as_tsktsk (_("debugger forward reference error, dbx type %d"),
			 spnt->type2);
	      return 0;
	    }
	}
/* It is too late to generate forward references, so the user gets a message.
 * This should only happen on a compiler error */
      (void) gen1 (spnt1, 1);
      i = Apoint;
      array_suffix (spnt);
      array_suffix_len = Apoint - i;
      switch (spnt1->advanced)
	{
	case BASIC:
	case FUNCTION:
	  break;
	default:
	  rpush (0, 2);
	  total_len += 2;
	  rpush (total_len, 2);
	  rpush (DST_K_VFLAGS_DSC, 1);
	  rpush (1, 1);		/* flags: element value spec included */
	  rpush (1, 1);		/* one dimension */
	  rpush (DBG_S_C_COMPLEX_ARRAY, 1);
	}
      total_len += array_suffix_len + 8;
      rpush (total_len, 2);
      break;
    default:	/* lint suppression */
      break;
    }
  return 0;
}

/* This generates a suffix for a variable.  If it is not a defined type yet,
   then dbx_type contains the type we are expecting so we can generate a
   forward reference.  This calls gen1 to build most of the descriptor, and
   then it puts the icing on at the end.  It then dumps whatever is needed
   to get a complete descriptor (i.e. struct reference, array suffix).  */

static void
generate_suffix (spnt, dbx_type)
     struct VMS_DBG_Symbol *spnt;
     int dbx_type;
{
  static const char pvoid[6] = {
		5,		/* record.length == 5 */
		DST_K_TYPSPEC,	/* record.type == 1 (type specification) */
		0,		/* name.length == 0, no name follows */
		1, 0,		/* type.length == 1 {2 bytes, little endian} */
		DBG_S_C_VOID	/* type.type == 5 (pointer to unspecified) */
  };
  int i;

  Apoint = 0;
  Lpnt = MAX_DEBUG_RECORD - 1;
  total_len = 0;
  struct_number = 0;
  overflow = 0;
  if (!spnt)
    new_forward_ref (dbx_type);
  else
    {
      if (spnt->VMS_type != DBG_S_C_ADVANCED_TYPE)
	return;		/* no suffix needed */
      gen1 (spnt, 0);
    }
  rpush (0, 1);		/* no name (len==0) */
  rpush (DST_K_TYPSPEC, 1);
  total_len += 4;
  rpush (total_len, 1);
  /* If the variable descriptor overflows the record, output a descriptor
     for a pointer to void.  */
  if ((total_len >= MAX_DEBUG_RECORD) || overflow)
    {
      as_warn (_("Variable descriptor %d too complicated.  Defined as `void *'."),
		spnt->dbx_type);
      VMS_Store_Immediate_Data (pvoid, 6, OBJ_S_C_DBG);
      return;
    }
  i = 0;
  while (Lpnt < MAX_DEBUG_RECORD - 1)
    Local[i++] = Local[++Lpnt];
  Lpnt = i;
  /* we use this for reference to structure that has already been defined */
  if (struct_number > 0)
    {
      VMS_Store_Immediate_Data (Local, Lpnt, OBJ_S_C_DBG);
      Lpnt = 0;
      VMS_Store_Struct (struct_number);
    }
  /* We use this for a forward reference to a structure that has yet to
     be defined.  We store four bytes of zero to make room for the actual
     address once it is known.  */
  if (struct_number < 0)
    {
      struct_number = -struct_number;
      VMS_Store_Immediate_Data (Local, Lpnt, OBJ_S_C_DBG);
      Lpnt = 0;
      VMS_Def_Struct (struct_number);
      COPY_LONG (&Local[Lpnt], 0L);
      Lpnt += 4;
      VMS_Store_Immediate_Data (Local, Lpnt, OBJ_S_C_DBG);
      Lpnt = 0;
    }
  i = 0;
  while (i < Apoint)
    Local[Lpnt++] = Asuffix[i++];
  if (Lpnt != 0)
    VMS_Store_Immediate_Data (Local, Lpnt, OBJ_S_C_DBG);
  Lpnt = 0;
}

	/* "novel length" type doesn't work for simple atomic types */
#define USE_BITSTRING_DESCRIPTOR(t) ((t)->advanced == BASIC)
#undef SETUP_BASIC_TYPES

/* This routine generates a type description for a bitfield.  */

static void
bitfield_suffix (spnt, width)
     struct VMS_DBG_Symbol *spnt;
     int width;
{
  Local[Lpnt++] = 13;			/* rec.len==13 */
  Local[Lpnt++] = DST_K_TYPSPEC;	/* a type specification record */
  Local[Lpnt++] = 0;			/* not named */
  COPY_SHORT (&Local[Lpnt], 9);		/* typ.len==9 */
  Lpnt += 2;
  Local[Lpnt++] = DST_K_TS_NOV_LENG;	/* This type is a "novel length"
					   incarnation of some other type.  */
  COPY_LONG (&Local[Lpnt], width);	/* size in bits == novel length */
  Lpnt += 4;
  VMS_Store_Immediate_Data (Local, Lpnt, OBJ_S_C_DBG);
  Lpnt = 0;
  /* assert( spnt->struc_numb > 0 ); */
  VMS_Store_Struct (spnt->struc_numb);	/* output 4 more bytes */
}

/* Formally define a builtin type, so that it can serve as the target of
   an indirect reference.  It makes bitfield_suffix() easier by avoiding
   the need to use a forward reference for the first occurrence of each
   type used in a bitfield.  */

static void
setup_basic_type (spnt)
     struct VMS_DBG_Symbol *spnt;
{
#ifdef SETUP_BASIC_TYPES
  /* This would be very useful if "novel length" fields actually worked
     with basic types like they do with enumerated types.  However,
     they do not, so this isn't worth doing just so that you can use
     EXAMINE/TYPE=(__long_long_int) instead of EXAMINE/QUAD.  */
  char *p;
#ifndef SETUP_SYNONYM_TYPES
  /* This determines whether compatible things like `int' and `long int'
     ought to have distinct type records rather than sharing one.  */
  struct VMS_DBG_Symbol *spnt2;

  /* first check whether this type has already been seen by another name */
  for (spnt2 = VMS_Symbol_type_list[SYMTYP_HASH (spnt->VMS_type)];
       spnt2;
       spnt2 = spnt2->next)
    if (spnt2 != spnt && spnt2->VMS_type == spnt->VMS_type)
      {
	spnt->struc_numb = spnt2->struc_numb;
	return;
      }
#endif

  /* `structure number' doesn't really mean `structure'; it means an index
     into a linker maintained set of saved locations which can be referenced
     again later.  */
  spnt->struc_numb = ++structure_count;
  VMS_Def_Struct (spnt->struc_numb);	/* remember where this type lives */
  /* define the simple scalar type */
  Local[Lpnt++] = 6 + strlen (symbol_name) + 2;	/* rec.len */
  Local[Lpnt++] = DST_K_TYPSPEC;	/* rec.typ==type specification */
  Local[Lpnt++] = strlen (symbol_name) + 2;
  Local[Lpnt++] = '_';			/* prefix name with "__" */
  Local[Lpnt++] = '_';
  for (p = symbol_name; *p; p++)
    Local[Lpnt++] = *p == ' ' ? '_' : *p;
  COPY_SHORT (&Local[Lpnt], 2);		/* typ.len==2 */
  Lpnt += 2;
  Local[Lpnt++] = DST_K_TS_ATOM;	/* typ.kind is simple type */
  Local[Lpnt++] = spnt->VMS_type;	/* typ.type */
  VMS_Store_Immediate_Data (Local, Lpnt, OBJ_S_C_DBG);
  Lpnt = 0;
#endif	/* SETUP_BASIC_TYPES */
  return;
}

/* This routine generates a symbol definition for a C symbol for the debugger.
   It takes a psect and offset for global symbols; if psect < 0, then this is
   a local variable and the offset is relative to FP.  In this case it can
   be either a variable (Offset < 0) or a parameter (Offset > 0).  */

static void
VMS_DBG_record (spnt, Psect, Offset, Name)
     struct VMS_DBG_Symbol *spnt;
     int Psect;
     int Offset;
     char *Name;
{
  char *Name_pnt;
  int len;
  int i = 0;

  /* if there are bad characters in name, convert them */
  Name_pnt = fix_name (Name);

  len = strlen (Name_pnt);
  if (Psect < 0)
    {				/* this is a local variable, referenced to SP */
      Local[i++] = 7 + len;
      Local[i++] = spnt->VMS_type;
      Local[i++] = (Offset > 0) ? DBG_C_FUNCTION_PARAM : DBG_C_LOCAL_SYM;
      COPY_LONG (&Local[i], Offset);
      i += 4;
    }
  else
    {
      Local[i++] = 7 + len;
      Local[i++] = spnt->VMS_type;
      Local[i++] = DST_K_VALKIND_ADDR;
      VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
      i = 0;
      VMS_Set_Data (Psect, Offset, OBJ_S_C_DBG, 0);
    }
  Local[i++] = len;
  while (*Name_pnt != '\0')
    Local[i++] = *Name_pnt++;
  VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
  if (spnt->VMS_type == DBG_S_C_ADVANCED_TYPE)
    generate_suffix (spnt, 0);
}

/* This routine parses the stabs entries in order to make the definition
   for the debugger of local symbols and function parameters.  */

static void
VMS_local_stab_Parse (sp)
     symbolS *sp;
{
  struct VMS_DBG_Symbol *spnt;
  char *pnt;
  char *pnt1;
  char *str;
  int dbx_type;

  dbx_type = 0;
  str = S_GET_NAME (sp);
  pnt = (char *) strchr (str, ':');
  if (!pnt)
    return;			/* no colon present */
  pnt1 = pnt++;			/* save this for later, and skip colon */
  if (*pnt == 'c')
    return;			/* ignore static constants */

/* there is one little catch that we must be aware of.  Sometimes function
 * parameters are optimized into registers, and the compiler, in its infiite
 * wisdom outputs stabs records for *both*.  In general we want to use the
 * register if it is present, so we must search the rest of the symbols for
 * this function to see if this parameter is assigned to a register.
 */
  {
    symbolS *sp1;
    char *str1;
    char *pnt2;

    if (*pnt == 'p')
      {
	for (sp1 = symbol_next (sp); sp1; sp1 = symbol_next (sp1))
	  {
	    if (!S_IS_DEBUG (sp1))
	      continue;
	    if (S_GET_RAW_TYPE (sp1) == N_FUN)
	      {
		pnt2 = (char *) strchr (S_GET_NAME (sp1), ':') + 1;
		if (*pnt2 == 'F' || *pnt2 == 'f')
		  break;
	      }
	    if (S_GET_RAW_TYPE (sp1) != N_RSYM)
	      continue;
	    str1 = S_GET_NAME (sp1);	/* and get the name */
	    pnt2 = str;
	    while (*pnt2 != ':')
	      {
		if (*pnt2 != *str1)
		  break;
		pnt2++;
		str1++;
	      }
	    if (*str1 == ':' && *pnt2 == ':')
	      return;	/* They are the same!  Let's skip this one.  */
	  }			/* for */
	pnt++;			/* skip p in case no register */
      }			/* if */
  }				/* p block */

  pnt = cvt_integer (pnt, &dbx_type);
  spnt = find_symbol (dbx_type);
  if (!spnt)
    return;			/*Dunno what this is*/
  *pnt1 = '\0';
  VMS_DBG_record (spnt, -1, S_GET_VALUE (sp), str);
  *pnt1 = ':';			/* and restore the string */
  return;
}

/* This routine parses a stabs entry to find the information required
   to define a variable.  It is used for global and static variables.
   Basically we need to know the address of the symbol.  With older
   versions of the compiler, const symbols are treated differently, in
   that if they are global they are written into the text psect.  The
   global symbol entry for such a const is actually written as a program
   entry point (Yuk!!), so if we cannot find a symbol in the list of
   psects, we must search the entry points as well.  static consts are
   even harder, since they are never assigned a memory address.  The
   compiler passes a stab to tell us the value, but I am not sure what
   to do with it.  */

static void
VMS_stab_parse (sp, expected_type, type1, type2, Text_Psect)
     symbolS *sp;
     int expected_type;	/* char */
     int type1, type2, Text_Psect;
{
  char *pnt;
  char *pnt1;
  char *str;
  symbolS *sp1;
  struct VMS_DBG_Symbol *spnt;
  struct VMS_Symbol *vsp;
  int dbx_type;

  dbx_type = 0;
  str = S_GET_NAME (sp);
  pnt = (char *) strchr (str, ':');
  if (!pnt)
    return;			/* no colon present */
  pnt1 = pnt;			/* save this for later*/
  pnt++;
  if (*pnt == expected_type)
    {
      pnt = cvt_integer (pnt + 1, &dbx_type);
      spnt = find_symbol (dbx_type);
      if (!spnt)
	return;		/*Dunno what this is*/
      /*
       * Now we need to search the symbol table to find the psect and
       * offset for this variable.
       */
      *pnt1 = '\0';
      vsp = VMS_Symbols;
      while (vsp)
	{
	  pnt = S_GET_NAME (vsp->Symbol);
	  if (pnt && *pnt++ == '_'
	      /* make sure name is the same and symbol type matches */
	      && strcmp (pnt, str) == 0
	      && (S_GET_RAW_TYPE (vsp->Symbol) == type1
		  || S_GET_RAW_TYPE (vsp->Symbol) == type2))
	    break;
	  vsp = vsp->Next;
	}
      if (vsp)
	{
	  VMS_DBG_record (spnt, vsp->Psect_Index, vsp->Psect_Offset, str);
	  *pnt1 = ':';		/* and restore the string */
	  return;
	}
      /* The symbol was not in the symbol list, but it may be an
         "entry point" if it was a constant.  */
      for (sp1 = symbol_rootP; sp1; sp1 = symbol_next (sp1))
	{
	  /*
	   *	Dispatch on STAB type
	   */
	  if (S_IS_DEBUG (sp1) || (S_GET_TYPE (sp1) != N_TEXT))
	    continue;
	  pnt = S_GET_NAME (sp1);
	  if (*pnt == '_')
	    pnt++;
	  if (strcmp (pnt, str) == 0)
	    {
	      if (!gave_compiler_message && expected_type == 'G')
		{
		  char *long_const_msg = _("\
***Warning - the assembly code generated by the compiler has placed \n\
 global constant(s) in the text psect.  These will not be available to \n\
 other modules, since this is not the correct way to handle this. You \n\
 have two options: 1) get a patched compiler that does not put global \n\
 constants in the text psect, or 2) remove the 'const' keyword from \n\
 definitions of global variables in your source module(s).  Don't say \n\
 I didn't warn you! \n");

		  as_tsktsk (long_const_msg);
		  gave_compiler_message = 1;
		}
	      VMS_DBG_record (spnt,
			      Text_Psect,
			      S_GET_VALUE (sp1),
			      str);
	      *pnt1 = ':';
	      /* fool assembler to not output this as a routine in the TBT */
	      pnt1 = S_GET_NAME (sp1);
	      *pnt1 = 'L';
	      S_SET_NAME (sp1, pnt1);
	      return;
	    }
	}
    }
  *pnt1 = ':';			/* and restore the string */
  return;
}

/* Simpler interfaces into VMS_stab_parse().  */

static void
VMS_GSYM_Parse (sp, Text_Psect)
     symbolS *sp;
     int Text_Psect;
{				/* Global variables */
  VMS_stab_parse (sp, 'G', (N_UNDF | N_EXT), (N_DATA | N_EXT), Text_Psect);
}

static void
VMS_LCSYM_Parse (sp, Text_Psect)
     symbolS *sp;
     int Text_Psect;
{				/* Static symbols - uninitialized */
  VMS_stab_parse (sp, 'S', N_BSS, -1, Text_Psect);
}

static void
VMS_STSYM_Parse (sp, Text_Psect)
     symbolS *sp;
     int Text_Psect;
{				/* Static symbols - initialized */
  VMS_stab_parse (sp, 'S', N_DATA, -1, Text_Psect);
}

/* For register symbols, we must figure out what range of addresses
   within the psect are valid.  We will use the brackets in the stab
   directives to give us guidance as to the PC range that this variable
   is in scope.  I am still not completely comfortable with this but
   as I learn more, I seem to get a better handle on what is going on.
   Caveat Emptor.  */

static void
VMS_RSYM_Parse (sp, Current_Routine, Text_Psect)
     symbolS *sp, *Current_Routine;
     int Text_Psect;
{
  symbolS *symbolP;
  struct VMS_DBG_Symbol *spnt;
  char *pnt;
  char *pnt1;
  char *str;
  int dbx_type;
  int len;
  int i = 0;
  int bcnt = 0;
  int Min_Offset = -1;		/* min PC of validity */
  int Max_Offset = 0;		/* max PC of validity */

  for (symbolP = sp; symbolP; symbolP = symbol_next (symbolP))
    {
      /*
       *	Dispatch on STAB type
       */
      switch (S_GET_RAW_TYPE (symbolP))
	{
	case N_LBRAC:
	  if (bcnt++ == 0)
	    Min_Offset = S_GET_VALUE (symbolP);
	  break;
	case N_RBRAC:
	  if (--bcnt == 0)
	    Max_Offset = S_GET_VALUE (symbolP) - 1;
	  break;
	}
      if ((Min_Offset != -1) && (bcnt == 0))
	break;
      if (S_GET_RAW_TYPE (symbolP) == N_FUN)
	{
	  pnt = (char *) strchr (S_GET_NAME (symbolP), ':') + 1;
	  if (*pnt == 'F' || *pnt == 'f') break;
	}
    }

  /* Check to see that the addresses were defined.  If not, then there
     were no brackets in the function, and we must try to search for
     the next function.  Since functions can be in any order, we should
     search all of the symbol list to find the correct ending address.  */
  if (Min_Offset == -1)
    {
      int Max_Source_Offset;
      int This_Offset;

      Min_Offset = S_GET_VALUE (sp);
      Max_Source_Offset = Min_Offset;	/* just in case no N_SLINEs found */
      for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
	switch (S_GET_RAW_TYPE (symbolP))
	  {
	  case N_TEXT | N_EXT:
	    This_Offset = S_GET_VALUE (symbolP);
	    if (This_Offset > Min_Offset && This_Offset < Max_Offset)
	      Max_Offset = This_Offset;
	    break;
	  case N_SLINE:
	    This_Offset = S_GET_VALUE (symbolP);
	    if (This_Offset > Max_Source_Offset)
	      Max_Source_Offset = This_Offset;
	    break;
	  }
      /* If this is the last routine, then we use the PC of the last source
         line as a marker of the max PC for which this reg is valid.  */
      if (Max_Offset == 0x7fffffff)
	Max_Offset = Max_Source_Offset;
    }

  dbx_type = 0;
  str = S_GET_NAME (sp);
  if ((pnt = (char *) strchr (str, ':')) == 0)
    return;			/* no colon present */
  pnt1 = pnt;			/* save this for later*/
  pnt++;
  if (*pnt != 'r')
    return;
  pnt = cvt_integer (pnt + 1, &dbx_type);
  spnt = find_symbol (dbx_type);
  if (!spnt)
    return;			/*Dunno what this is yet*/
  *pnt1 = '\0';
  pnt = fix_name (S_GET_NAME (sp));	/* if there are bad characters in name, convert them */
  len = strlen (pnt);
  Local[i++] = 25 + len;
  Local[i++] = spnt->VMS_type;
  Local[i++] = DST_K_VFLAGS_TVS;	/* trailing value specified */
  COPY_LONG (&Local[i], 1 + len);	/* relative offset, beyond name */
  i += 4;
  Local[i++] = len;			/* name length (ascic prefix) */
  while (*pnt != '\0')
    Local[i++] = *pnt++;
  Local[i++] = DST_K_VS_FOLLOWS;	/* value specification follows */
  COPY_SHORT (&Local[i], 15);		/* length of rest of record */
  i += 2;
  Local[i++] = DST_K_VS_ALLOC_SPLIT;	/* split lifetime */
  Local[i++] = 1;			/* one binding follows */
  VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
  i = 0;
  VMS_Set_Data (Text_Psect, Min_Offset, OBJ_S_C_DBG, 1);
  VMS_Set_Data (Text_Psect, Max_Offset, OBJ_S_C_DBG, 1);
  Local[i++] = DST_K_VALKIND_REG;		/* nested value spec */
  COPY_LONG (&Local[i], S_GET_VALUE (sp));
  i += 4;
  VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
  *pnt1 = ':';
  if (spnt->VMS_type == DBG_S_C_ADVANCED_TYPE)
    generate_suffix (spnt, 0);
}

/* This function examines a structure definition, checking all of the elements
   to make sure that all of them are fully defined.  The only thing that we
   kick out are arrays of undefined structs, since we do not know how big
   they are.  All others we can handle with a normal forward reference.  */

static int
forward_reference (pnt)
     char *pnt;
{
  struct VMS_DBG_Symbol *spnt, *spnt1;
  int i;

  pnt = cvt_integer (pnt + 1, &i);
  if (*pnt == ';')
    return 0;			/* no forward references */
  do
    {
      pnt = (char *) strchr (pnt, ':');
      pnt = cvt_integer (pnt + 1, &i);
      spnt = find_symbol (i);
      while (spnt && (spnt->advanced == POINTER || spnt->advanced == ARRAY))
	{
	  spnt1 = find_symbol (spnt->type2);
	  if (spnt->advanced == ARRAY && !spnt1)
	    return 1;
	  spnt = spnt1;
	}
      pnt = cvt_integer (pnt + 1, &i);
      pnt = cvt_integer (pnt + 1, &i);
    } while (*++pnt != ';');
  return 0;			/* no forward refences found */
}

/* Used to check a single element of a structure on the final pass.  */

static int
final_forward_reference (spnt)
     struct VMS_DBG_Symbol *spnt;
{
  struct VMS_DBG_Symbol *spnt1;

  while (spnt && (spnt->advanced == POINTER || spnt->advanced == ARRAY))
    {
      spnt1 = find_symbol (spnt->type2);
      if (spnt->advanced == ARRAY && !spnt1)
	return 1;
      spnt = spnt1;
    }
  return 0;	/* no forward refences found */
}

/* This routine parses the stabs directives to find any definitions of dbx
   type numbers.  It makes a note of all of them, creating a structure
   element of VMS_DBG_Symbol that describes it.  This also generates the
   info for the debugger that describes the struct/union/enum, so that
   further references to these data types will be by number

   We have to process pointers right away, since there can be references
   to them later in the same stabs directive.  We cannot have forward
   references to pointers, (but we can have a forward reference to a
   pointer to a structure/enum/union) and this is why we process them
   immediately.  After we process the pointer, then we search for defs
   that are nested even deeper.

   8/15/92: We have to process arrays right away too, because there can
   be multiple references to identical array types in one structure
   definition, and only the first one has the definition.  */

static int
VMS_typedef_parse (str)
     char *str;
{
  char *pnt;
  char *pnt1;
  const char *pnt2;
  int i;
  int dtype;
  struct forward_ref *fpnt;
  int i1, i2, i3, len;
  struct VMS_DBG_Symbol *spnt;
  struct VMS_DBG_Symbol *spnt1;

  /* check for any nested def's */
  pnt = (char *) strchr (str + 1, '=');
  if (pnt && str[1] != '*' && (str[1] != 'a' || str[2] != 'r')
      && VMS_typedef_parse (pnt) == 1)
    return 1;
  /* now find dbx_type of entry */
  pnt = str - 1;
  if (*pnt == 'c')
    {				/* check for static constants */
      *str = '\0';		/* for now we ignore them */
      return 0;
    }
  while ((*pnt <= '9') && (*pnt >= '0'))
    pnt--;
  pnt++;			/* and get back to the number */
  cvt_integer (pnt, &i1);
  spnt = find_symbol (i1);
  /* first see if this has been defined already, due to forward reference */
  if (!spnt)
    {
      i2 = SYMTYP_HASH (i1);
      spnt = (struct VMS_DBG_Symbol *) xmalloc (sizeof (struct VMS_DBG_Symbol));
      spnt->next = VMS_Symbol_type_list[i2];
      VMS_Symbol_type_list[i2] = spnt;
      spnt->dbx_type = i1;	/* and save the type */
      spnt->type2 = spnt->VMS_type = spnt->data_size = 0;
      spnt->index_min = spnt->index_max = spnt->struc_numb = 0;
    }
  /*
   * For structs and unions, do a partial parse, otherwise we sometimes get
   * circular definitions that are impossible to resolve.  We read enough
   * info so that any reference to this type has enough info to be resolved.
   */
  pnt = str + 1;		/* point to character past equal sign */
  if (*pnt >= '0' && *pnt <= '9')
    {
      if (type_check ("void"))
	{			/* this is the void symbol */
	  *str = '\0';
	  spnt->advanced = VOID;
	  return 0;
	}
      if (type_check ("unknown type"))
	{
	  *str = '\0';
	  spnt->advanced = UNKNOWN;
	  return 0;
	}
      pnt1 = cvt_integer (pnt, &i1);
      if (i1 != spnt->dbx_type)
	{
	  spnt->advanced = ALIAS;
	  spnt->type2 = i1;
	  strcpy (str, pnt1);
	  return 0;
	}
      as_tsktsk (_("debugginer output: %d is an unknown untyped variable."),
		 spnt->dbx_type);
      return 1;			/* do not know what this is */
    }

  pnt = str + 1;		/* point to character past equal sign */
  switch (*pnt)
    {
    case 'r':
      spnt->advanced = BASIC;
      if (type_check ("int"))
	{
	  spnt->VMS_type = DBG_S_C_SLINT;
	  spnt->data_size = 4;
	}
      else if (type_check ("long int"))
	{
	  spnt->VMS_type = DBG_S_C_SLINT;
	  spnt->data_size = 4;
	}
      else if (type_check ("unsigned int"))
	{
	  spnt->VMS_type = DBG_S_C_ULINT;
	  spnt->data_size = 4;
	}
      else if (type_check ("long unsigned int"))
	{
	  spnt->VMS_type = DBG_S_C_ULINT;
	  spnt->data_size = 4;
	}
      else if (type_check ("short int"))
	{
	  spnt->VMS_type = DBG_S_C_SSINT;
	  spnt->data_size = 2;
	}
      else if (type_check ("short unsigned int"))
	{
	  spnt->VMS_type = DBG_S_C_USINT;
	  spnt->data_size = 2;
	}
      else if (type_check ("char"))
	{
	  spnt->VMS_type = DBG_S_C_SCHAR;
	  spnt->data_size = 1;
	}
      else if (type_check ("signed char"))
	{
	  spnt->VMS_type = DBG_S_C_SCHAR;
	  spnt->data_size = 1;
	}
      else if (type_check ("unsigned char"))
	{
	  spnt->VMS_type = DBG_S_C_UCHAR;
	  spnt->data_size = 1;
	}
      else if (type_check ("float"))
	{
	  spnt->VMS_type = DBG_S_C_REAL4;
	  spnt->data_size = 4;
	}
      else if (type_check ("double"))
	{
	  spnt->VMS_type = vax_g_doubles ? DBG_S_C_REAL8_G : DBG_S_C_REAL8;
	  spnt->data_size = 8;
	}
      else if (type_check ("long double"))
	{
	  /* same as double, at least for now */
	  spnt->VMS_type = vax_g_doubles ? DBG_S_C_REAL8_G : DBG_S_C_REAL8;
	  spnt->data_size = 8;
	}
      else if (type_check ("long long int"))
	{
	  spnt->VMS_type = DBG_S_C_SQUAD;	/* signed quadword */
	  spnt->data_size = 8;
	}
      else if (type_check ("long long unsigned int"))
	{
	  spnt->VMS_type = DBG_S_C_UQUAD;	/* unsigned quadword */
	  spnt->data_size = 8;
	}
      else if (type_check ("complex float"))
	{
	  spnt->VMS_type = DBG_S_C_COMPLX4;
	  spnt->data_size = 2 * 4;
	}
      else if (type_check ("complex double"))
	{
	  spnt->VMS_type = vax_g_doubles ? DBG_S_C_COMPLX8_G : DBG_S_C_COMPLX8;
	  spnt->data_size = 2 * 8;
	}
      else if (type_check ("complex long double"))
	{
	  /* same as complex double, at least for now */
	  spnt->VMS_type = vax_g_doubles ? DBG_S_C_COMPLX8_G : DBG_S_C_COMPLX8;
	  spnt->data_size = 2 * 8;
	}
      else
	{
	  /*	[pr]
	   * Shouldn't get here, but if we do, something
	   * more substantial ought to be done...
	   */
	  spnt->VMS_type = 0;
	  spnt->data_size = 0;
	}
      if (spnt->VMS_type != 0)
	setup_basic_type (spnt);
      pnt1 = (char *) strchr (str, ';') + 1;
      break;
    case 's':
    case 'u':
      spnt->advanced = (*pnt == 's') ? STRUCT : UNION;
      spnt->VMS_type = DBG_S_C_ADVANCED_TYPE;
      pnt1 = cvt_integer (pnt + 1, &spnt->data_size);
      if (!final_pass && forward_reference (pnt))
	{
	  spnt->struc_numb = -1;
	  return 1;
	}
      spnt->struc_numb = ++structure_count;
      pnt1--;
      pnt = get_struct_name (str);
      VMS_Def_Struct (spnt->struc_numb);
      i = 0;
      for (fpnt = f_ref_root; fpnt; fpnt = fpnt->next)
	if (fpnt->dbx_type == spnt->dbx_type)
	  {
	    fpnt->resolved = 'Y';
	    VMS_Set_Struct (fpnt->struc_numb);
	    VMS_Store_Struct (spnt->struc_numb);
	    i++;
	  }
      if (i > 0)
	VMS_Set_Struct (spnt->struc_numb);
      i = 0;
      Local[i++] = 11 + strlen (pnt);
      Local[i++] = DBG_S_C_STRUCT_START;
      Local[i++] = DST_K_VFLAGS_NOVAL;	/* structure definition only */
      COPY_LONG (&Local[i], 0L);	/* hence value is unused */
      i += 4;
      Local[i++] = strlen (pnt);
      pnt2 = pnt;
      while (*pnt2 != '\0')
	Local[i++] = *pnt2++;
      i2 = spnt->data_size * 8;	/* number of bits */
      COPY_LONG (&Local[i], i2);
      i += 4;
      VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
      i = 0;
      if (pnt != symbol_name)
	{
	  pnt += strlen (pnt);
	  *pnt = ':';
	}			/* replace colon for later */
      while (*++pnt1 != ';')
	{
	  pnt = (char *) strchr (pnt1, ':');
	  *pnt = '\0';
	  pnt2 = pnt1;
	  pnt1 = cvt_integer (pnt + 1, &dtype);
	  pnt1 = cvt_integer (pnt1 + 1, &i2);
	  pnt1 = cvt_integer (pnt1 + 1, &i3);
	  spnt1 = find_symbol (dtype);
	  len = strlen (pnt2);
	  if (spnt1 && (spnt1->advanced == BASIC || spnt1->advanced == ENUM)
	      && ((i3 != spnt1->data_size * 8) || (i2 % 8 != 0)))
	    {			/* bitfield */
	      if (USE_BITSTRING_DESCRIPTOR (spnt1))
		{
		  /* This uses a type descriptor, which doesn't work if
		     the enclosing structure has been placed in a register.
		     Also, enum bitfields degenerate to simple integers.  */
		  int unsigned_type = (spnt1->VMS_type == DBG_S_C_ULINT
				    || spnt1->VMS_type == DBG_S_C_USINT
				    || spnt1->VMS_type == DBG_S_C_UCHAR
				    || spnt1->VMS_type == DBG_S_C_UQUAD
				    || spnt1->advanced == ENUM); /* (approximate) */
		  Apoint = 0;
		  fpush (19 + len, 1);
		  fpush (unsigned_type ? DBG_S_C_UBITU : DBG_S_C_SBITU, 1);
		  fpush (DST_K_VFLAGS_DSC, 1);	/* specified by descriptor */
		  fpush (1 + len, 4);	/* relative offset to descriptor */
		  fpush (len, 1);		/* length byte (ascic prefix) */
		  while (*pnt2 != '\0')	/* name bytes */
		    fpush (*pnt2++, 1);
		  fpush (i3, 2);	/* dsc length == size of bitfield */
					/* dsc type == un?signed bitfield */
		  fpush (unsigned_type ? DBG_S_C_UBITU : DBG_S_C_SBITU, 1);
		  fpush (DSC_K_CLASS_UBS, 1);	/* dsc class == unaligned bitstring */
		  fpush (0x00, 4);		/* dsc pointer == zeroes */
		  fpush (i2, 4);	/* start position */
		  VMS_Store_Immediate_Data (Asuffix, Apoint, OBJ_S_C_DBG);
		  Apoint = 0;
		}
	      else
		{
		  /* Use a "novel length" type specification, which works
		     right for register structures and for enum bitfields
		     but results in larger object modules.  */
		  Local[i++] = 7 + len;
		  Local[i++] = DBG_S_C_ADVANCED_TYPE;	/* type spec follows */
		  Local[i++] = DBG_S_C_STRUCT_ITEM;	/* value is a bit offset */
		  COPY_LONG (&Local[i], i2);		/* bit offset */
		  i += 4;
		  Local[i++] = strlen (pnt2);
		  while (*pnt2 != '\0')
		    Local[i++] = *pnt2++;
		  VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
		  i = 0;
		  bitfield_suffix (spnt1, i3);
	     }
	    }
	  else
	    {			/* not a bitfield */
	      /* check if this is a forward reference */
	      if (final_pass && final_forward_reference (spnt1))
		{
		  as_tsktsk (_("debugger output: structure element `%s' has undefined type"),
			   pnt2);
		  continue;
		}
	      Local[i++] = 7 + len;
	      Local[i++] = spnt1 ? spnt1->VMS_type : DBG_S_C_ADVANCED_TYPE;
	      Local[i++] = DBG_S_C_STRUCT_ITEM;
	      COPY_LONG (&Local[i], i2);		/* bit offset */
	      i += 4;
	      Local[i++] = strlen (pnt2);
	      while (*pnt2 != '\0')
		Local[i++] = *pnt2++;
	      VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
	      i = 0;
	      if (!spnt1)
		generate_suffix (spnt1, dtype);
	      else if (spnt1->VMS_type == DBG_S_C_ADVANCED_TYPE)
		generate_suffix (spnt1, 0);
	    }
	}
      pnt1++;
      Local[i++] = 0x01;	/* length byte */
      Local[i++] = DBG_S_C_STRUCT_END;
      VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
      i = 0;
      break;
    case 'e':
      spnt->advanced = ENUM;
      spnt->VMS_type = DBG_S_C_ADVANCED_TYPE;
      spnt->struc_numb = ++structure_count;
      spnt->data_size = 4;
      VMS_Def_Struct (spnt->struc_numb);
      i = 0;
      for (fpnt = f_ref_root; fpnt; fpnt = fpnt->next)
	if (fpnt->dbx_type == spnt->dbx_type)
	  {
	    fpnt->resolved = 'Y';
	    VMS_Set_Struct (fpnt->struc_numb);
	    VMS_Store_Struct (spnt->struc_numb);
	    i++;
	  }
      if (i > 0)
	VMS_Set_Struct (spnt->struc_numb);
      i = 0;
      len = strlen (symbol_name);
      Local[i++] = 3 + len;
      Local[i++] = DBG_S_C_ENUM_START;
      Local[i++] = 4 * 8;		/* enum values are 32 bits */
      Local[i++] = len;
      pnt2 = symbol_name;
      while (*pnt2 != '\0')
	Local[i++] = *pnt2++;
      VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
      i = 0;
      while (*++pnt != ';')
	{
	  pnt1 = (char *) strchr (pnt, ':');
	  *pnt1++ = '\0';
	  pnt1 = cvt_integer (pnt1, &i1);
	  len = strlen (pnt);
	  Local[i++] = 7 + len;
	  Local[i++] = DBG_S_C_ENUM_ITEM;
	  Local[i++] = DST_K_VALKIND_LITERAL;
	  COPY_LONG (&Local[i], i1);
	  i += 4;
	  Local[i++] = len;
	  pnt2 = pnt;
	  while (*pnt != '\0')
	    Local[i++] = *pnt++;
	  VMS_Store_Immediate_Data (Local, i, OBJ_S_C_DBG);
	  i = 0;