[deliverable/binutils-gdb.git] / gdb / f-lang.c

/* Fortran language support routines for GDB, the GNU debugger.
   Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002
   Free Software Foundation, Inc.
   Contributed by Motorola.  Adapted from the C parser by Farooq Butt
   (fmbutt@engage.sps.mot.com).

   This file is part of GDB.

   This program 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 of the License, or
   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "gdb_string.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "f-lang.h"
#include "valprint.h"

/* The built-in types of F77.  FIXME: integer*4 is missing, plain
   logical is missing (builtin_type_logical is logical*4).  */

struct type *builtin_type_f_character;
struct type *builtin_type_f_logical;
struct type *builtin_type_f_logical_s1;
struct type *builtin_type_f_logical_s2;
struct type *builtin_type_f_integer;
struct type *builtin_type_f_integer_s2;
struct type *builtin_type_f_real;
struct type *builtin_type_f_real_s8;
struct type *builtin_type_f_real_s16;
struct type *builtin_type_f_complex_s8;
struct type *builtin_type_f_complex_s16;
struct type *builtin_type_f_complex_s32;
struct type *builtin_type_f_void;

/* Following is dubious stuff that had been in the xcoff reader. */

struct saved_fcn
  {
    long line_offset;		/* Line offset for function */
    struct saved_fcn *next;
  };


struct saved_bf_symnum
  {
    long symnum_fcn;		/* Symnum of function (i.e. .function directive) */
    long symnum_bf;		/* Symnum of .bf for this function */
    struct saved_bf_symnum *next;
  };

typedef struct saved_fcn SAVED_FUNCTION, *SAVED_FUNCTION_PTR;
typedef struct saved_bf_symnum SAVED_BF, *SAVED_BF_PTR;

/* Local functions */

extern void _initialize_f_language (void);
#if 0
static void clear_function_list (void);
static long get_bf_for_fcn (long);
static void clear_bf_list (void);
static void patch_all_commons_by_name (char *, CORE_ADDR, int);
static SAVED_F77_COMMON_PTR find_first_common_named (char *);
static void add_common_entry (struct symbol *);
static void add_common_block (char *, CORE_ADDR, int, char *);
static SAVED_FUNCTION *allocate_saved_function_node (void);
static SAVED_BF_PTR allocate_saved_bf_node (void);
static COMMON_ENTRY_PTR allocate_common_entry_node (void);
static SAVED_F77_COMMON_PTR allocate_saved_f77_common_node (void);
static void patch_common_entries (SAVED_F77_COMMON_PTR, CORE_ADDR, int);
#endif

static struct type *f_create_fundamental_type (struct objfile *, int);
static void f_printstr (struct ui_file * stream, char *string,
			unsigned int length, int width,
			int force_ellipses);
static void f_printchar (int c, struct ui_file * stream);
static void f_emit_char (int c, struct ui_file * stream, int quoter);

/* Print the character C on STREAM as part of the contents of a literal
   string whose delimiter is QUOTER.  Note that that format for printing
   characters and strings is language specific.
   FIXME:  This is a copy of the same function from c-exp.y.  It should
   be replaced with a true F77 version.  */

static void
f_emit_char (register int c, struct ui_file *stream, int quoter)
{
  c &= 0xFF;			/* Avoid sign bit follies */

  if (PRINT_LITERAL_FORM (c))
    {
      if (c == '\\' || c == quoter)
	fputs_filtered ("\\", stream);
      fprintf_filtered (stream, "%c", c);
    }
  else
    {
      switch (c)
	{
	case '\n':
	  fputs_filtered ("\\n", stream);
	  break;
	case '\b':
	  fputs_filtered ("\\b", stream);
	  break;
	case '\t':
	  fputs_filtered ("\\t", stream);
	  break;
	case '\f':
	  fputs_filtered ("\\f", stream);
	  break;
	case '\r':
	  fputs_filtered ("\\r", stream);
	  break;
	case '\033':
	  fputs_filtered ("\\e", stream);
	  break;
	case '\007':
	  fputs_filtered ("\\a", stream);
	  break;
	default:
	  fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
	  break;
	}
    }
}

/* FIXME:  This is a copy of the same function from c-exp.y.  It should
   be replaced with a true F77version. */

static void
f_printchar (int c, struct ui_file *stream)
{
  fputs_filtered ("'", stream);
  LA_EMIT_CHAR (c, stream, '\'');
  fputs_filtered ("'", stream);
}

/* Print the character string STRING, printing at most LENGTH characters.
   Printing stops early if the number hits print_max; repeat counts
   are printed as appropriate.  Print ellipses at the end if we
   had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
   FIXME:  This is a copy of the same function from c-exp.y.  It should
   be replaced with a true F77 version. */

static void
f_printstr (struct ui_file *stream, char *string, unsigned int length,
	    int width, int force_ellipses)
{
  register unsigned int i;
  unsigned int things_printed = 0;
  int in_quotes = 0;
  int need_comma = 0;

  if (length == 0)
    {
      fputs_filtered ("''", gdb_stdout);
      return;
    }

  for (i = 0; i < length && things_printed < print_max; ++i)
    {
      /* Position of the character we are examining
         to see whether it is repeated.  */
      unsigned int rep1;
      /* Number of repetitions we have detected so far.  */
      unsigned int reps;

      QUIT;

      if (need_comma)
	{
	  fputs_filtered (", ", stream);
	  need_comma = 0;
	}

      rep1 = i + 1;
      reps = 1;
      while (rep1 < length && string[rep1] == string[i])
	{
	  ++rep1;
	  ++reps;
	}

      if (reps > repeat_count_threshold)
	{
	  if (in_quotes)
	    {
	      if (inspect_it)
		fputs_filtered ("\\', ", stream);
	      else
		fputs_filtered ("', ", stream);
	      in_quotes = 0;
	    }
	  f_printchar (string[i], stream);
	  fprintf_filtered (stream, " <repeats %u times>", reps);
	  i = rep1 - 1;
	  things_printed += repeat_count_threshold;
	  need_comma = 1;
	}
      else
	{
	  if (!in_quotes)
	    {
	      if (inspect_it)
		fputs_filtered ("\\'", stream);
	      else
		fputs_filtered ("'", stream);
	      in_quotes = 1;
	    }
	  LA_EMIT_CHAR (string[i], stream, '"');
	  ++things_printed;
	}
    }

  /* Terminate the quotes if necessary.  */
  if (in_quotes)
    {
      if (inspect_it)
	fputs_filtered ("\\'", stream);
      else
	fputs_filtered ("'", stream);
    }

  if (force_ellipses || i < length)
    fputs_filtered ("...", stream);
}

/* FIXME:  This is a copy of c_create_fundamental_type(), before
   all the non-C types were stripped from it.  Needs to be fixed
   by an experienced F77 programmer. */

static struct type *
f_create_fundamental_type (struct objfile *objfile, int typeid)
{
  register struct type *type = NULL;

  switch (typeid)
    {
    case FT_VOID:
      type = init_type (TYPE_CODE_VOID,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "VOID", objfile);
      break;
    case FT_BOOLEAN:
      type = init_type (TYPE_CODE_BOOL,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "boolean", objfile);
      break;
    case FT_STRING:
      type = init_type (TYPE_CODE_STRING,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "string", objfile);
      break;
    case FT_CHAR:
      type = init_type (TYPE_CODE_INT,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "character", objfile);
      break;
    case FT_SIGNED_CHAR:
      type = init_type (TYPE_CODE_INT,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "integer*1", objfile);
      break;
    case FT_UNSIGNED_CHAR:
      type = init_type (TYPE_CODE_BOOL,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "logical*1", objfile);
      break;
    case FT_SHORT:
      type = init_type (TYPE_CODE_INT,
			TARGET_SHORT_BIT / TARGET_CHAR_BIT,
			0, "integer*2", objfile);
      break;
    case FT_SIGNED_SHORT:
      type = init_type (TYPE_CODE_INT,
			TARGET_SHORT_BIT / TARGET_CHAR_BIT,
			0, "short", objfile);	/* FIXME-fnf */
      break;
    case FT_UNSIGNED_SHORT:
      type = init_type (TYPE_CODE_BOOL,
			TARGET_SHORT_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "logical*2", objfile);
      break;
    case FT_INTEGER:
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "integer*4", objfile);
      break;
    case FT_SIGNED_INTEGER:
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "integer", objfile);		/* FIXME -fnf */
      break;
    case FT_UNSIGNED_INTEGER:
      type = init_type (TYPE_CODE_BOOL,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "logical*4", objfile);
      break;
    case FT_FIXED_DECIMAL:
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "fixed decimal", objfile);
      break;
    case FT_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_BIT / TARGET_CHAR_BIT,
			0, "long", objfile);
      break;
    case FT_SIGNED_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_BIT / TARGET_CHAR_BIT,
			0, "long", objfile);	/* FIXME -fnf */
      break;
    case FT_UNSIGNED_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "unsigned long", objfile);
      break;
    case FT_LONG_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
			0, "long long", objfile);
      break;
    case FT_SIGNED_LONG_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
			0, "signed long long", objfile);
      break;
    case FT_UNSIGNED_LONG_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "unsigned long long", objfile);
      break;
    case FT_FLOAT:
      type = init_type (TYPE_CODE_FLT,
			TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
			0, "real", objfile);
      break;
    case FT_DBL_PREC_FLOAT:
      type = init_type (TYPE_CODE_FLT,
			TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "real*8", objfile);
      break;
    case FT_FLOAT_DECIMAL:
      type = init_type (TYPE_CODE_FLT,
			TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "floating decimal", objfile);
      break;
    case FT_EXT_PREC_FLOAT:
      type = init_type (TYPE_CODE_FLT,
			TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "real*16", objfile);
      break;
    case FT_COMPLEX:
      type = init_type (TYPE_CODE_COMPLEX,
			2 * TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
			0, "complex*8", objfile);
      TYPE_TARGET_TYPE (type) = builtin_type_f_real;
      break;
    case FT_DBL_PREC_COMPLEX:
      type = init_type (TYPE_CODE_COMPLEX,
			2 * TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "complex*16", objfile);
      TYPE_TARGET_TYPE (type) = builtin_type_f_real_s8;
      break;
    case FT_EXT_PREC_COMPLEX:
      type = init_type (TYPE_CODE_COMPLEX,
			2 * TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "complex*32", objfile);
      TYPE_TARGET_TYPE (type) = builtin_type_f_real_s16;
      break;
    default:
      /* FIXME:  For now, if we are asked to produce a type not in this
         language, create the equivalent of a C integer type with the
         name "<?type?>".  When all the dust settles from the type
         reconstruction work, this should probably become an error. */
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "<?type?>", objfile);
      warning ("internal error: no F77 fundamental type %d", typeid);
      break;
    }
  return (type);
}
\f

/* Table of operators and their precedences for printing expressions.  */

static const struct op_print f_op_print_tab[] =
{
  {"+", BINOP_ADD, PREC_ADD, 0},
  {"+", UNOP_PLUS, PREC_PREFIX, 0},
  {"-", BINOP_SUB, PREC_ADD, 0},
  {"-", UNOP_NEG, PREC_PREFIX, 0},
  {"*", BINOP_MUL, PREC_MUL, 0},
  {"/", BINOP_DIV, PREC_MUL, 0},
  {"DIV", BINOP_INTDIV, PREC_MUL, 0},
  {"MOD", BINOP_REM, PREC_MUL, 0},
  {"=", BINOP_ASSIGN, PREC_ASSIGN, 1},
  {".OR.", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
  {".AND.", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
  {".NOT.", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
  {".EQ.", BINOP_EQUAL, PREC_EQUAL, 0},
  {".NE.", BINOP_NOTEQUAL, PREC_EQUAL, 0},
  {".LE.", BINOP_LEQ, PREC_ORDER, 0},
  {".GE.", BINOP_GEQ, PREC_ORDER, 0},
  {".GT.", BINOP_GTR, PREC_ORDER, 0},
  {".LT.", BINOP_LESS, PREC_ORDER, 0},
  {"**", UNOP_IND, PREC_PREFIX, 0},
  {"@", BINOP_REPEAT, PREC_REPEAT, 0},
  {NULL, 0, 0, 0}
};
\f
struct type **const (f_builtin_types[]) =
{
  &builtin_type_f_character,
    &builtin_type_f_logical,
    &builtin_type_f_logical_s1,
    &builtin_type_f_logical_s2,
    &builtin_type_f_integer,
    &builtin_type_f_integer_s2,
    &builtin_type_f_real,
    &builtin_type_f_real_s8,
    &builtin_type_f_real_s16,
    &builtin_type_f_complex_s8,
    &builtin_type_f_complex_s16,
#if 0
    &builtin_type_f_complex_s32,
#endif
    &builtin_type_f_void,
    0
};

/* This is declared in c-lang.h but it is silly to import that file for what
   is already just a hack. */
extern int c_value_print (struct value *, struct ui_file *, int,
			  enum val_prettyprint);

const struct language_defn f_language_defn =
{
  "fortran",
  language_fortran,
  f_builtin_types,
  range_check_on,
  type_check_on,
  case_sensitive_off,
  f_parse,			/* parser */
  f_error,			/* parser error function */
  evaluate_subexp_standard,
  f_printchar,			/* Print character constant */
  f_printstr,			/* function to print string constant */
  f_emit_char,			/* Function to print a single character */
  f_create_fundamental_type,	/* Create fundamental type in this language */
  f_print_type,			/* Print a type using appropriate syntax */
  f_val_print,			/* Print a value using appropriate syntax */
  c_value_print,		/* FIXME */
  NULL,				/* Language specific skip_trampoline */
  NULL,				/* Language specific symbol demangler */
  {"", "", "", ""},		/* Binary format info */
  {"0%o", "0", "o", ""},	/* Octal format info */
  {"%d", "", "d", ""},		/* Decimal format info */
  {"0x%x", "0x", "x", ""},	/* Hex format info */
  f_op_print_tab,		/* expression operators for printing */
  0,				/* arrays are first-class (not c-style) */
  1,				/* String lower bound */
  &builtin_type_f_character,	/* Type of string elements */
  LANG_MAGIC
};

static void
build_fortran_types (void)
{
  builtin_type_f_void =
    init_type (TYPE_CODE_VOID, 1,
	       0,
	       "VOID", (struct objfile *) NULL);

  builtin_type_f_character =
    init_type (TYPE_CODE_INT, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
	       0,
	       "character", (struct objfile *) NULL);

  builtin_type_f_logical_s1 =
    init_type (TYPE_CODE_BOOL, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
	       TYPE_FLAG_UNSIGNED,
	       "logical*1", (struct objfile *) NULL);

  builtin_type_f_integer_s2 =
    init_type (TYPE_CODE_INT, TARGET_SHORT_BIT / TARGET_CHAR_BIT,
	       0,
	       "integer*2", (struct objfile *) NULL);

  builtin_type_f_logical_s2 =
    init_type (TYPE_CODE_BOOL, TARGET_SHORT_BIT / TARGET_CHAR_BIT,
	       TYPE_FLAG_UNSIGNED,
	       "logical*2", (struct objfile *) NULL);

  builtin_type_f_integer =
    init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT,
	       0,
	       "integer", (struct objfile *) NULL);

  builtin_type_f_logical =
    init_type (TYPE_CODE_BOOL, TARGET_INT_BIT / TARGET_CHAR_BIT,
	       TYPE_FLAG_UNSIGNED,
	       "logical*4", (struct objfile *) NULL);

  builtin_type_f_real =
    init_type (TYPE_CODE_FLT, TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
	       0,
	       "real", (struct objfile *) NULL);

  builtin_type_f_real_s8 =
    init_type (TYPE_CODE_FLT, TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
	       0,
	       "real*8", (struct objfile *) NULL);

  builtin_type_f_real_s16 =
    init_type (TYPE_CODE_FLT, TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
	       0,
	       "real*16", (struct objfile *) NULL);

  builtin_type_f_complex_s8 =
    init_type (TYPE_CODE_COMPLEX, 2 * TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
	       0,
	       "complex*8", (struct objfile *) NULL);
  TYPE_TARGET_TYPE (builtin_type_f_complex_s8) = builtin_type_f_real;

  builtin_type_f_complex_s16 =
    init_type (TYPE_CODE_COMPLEX, 2 * TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
	       0,
	       "complex*16", (struct objfile *) NULL);
  TYPE_TARGET_TYPE (builtin_type_f_complex_s16) = builtin_type_f_real_s8;

  /* We have a new size == 4 double floats for the
     complex*32 data type */

  builtin_type_f_complex_s32 =
    init_type (TYPE_CODE_COMPLEX, 2 * TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
	       0,
	       "complex*32", (struct objfile *) NULL);
  TYPE_TARGET_TYPE (builtin_type_f_complex_s32) = builtin_type_f_real_s16;
}

void
_initialize_f_language (void)
{
  build_fortran_types ();
  register_gdbarch_swap (&builtin_type_f_character, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_logical, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_logical_s1, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_logical_s2, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_integer, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_integer_s2, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_real, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_real_s8, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_real_s16, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_complex_s8, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_complex_s16, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_complex_s32, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_f_void, 
			 sizeof (struct type *), NULL);
  register_gdbarch_swap (&builtin_type_string, 
			 sizeof (struct type *), NULL);

  register_gdbarch_swap (NULL, 0, build_fortran_types);

  builtin_type_string =
    init_type (TYPE_CODE_STRING, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
	       0,
	       "character string", (struct objfile *) NULL);

  add_language (&f_language_defn);
}

#if 0
static SAVED_BF_PTR
allocate_saved_bf_node (void)
{
  SAVED_BF_PTR new;

  new = (SAVED_BF_PTR) xmalloc (sizeof (SAVED_BF));
  return (new);
}

static SAVED_FUNCTION *
allocate_saved_function_node (void)
{
  SAVED_FUNCTION *new;

  new = (SAVED_FUNCTION *) xmalloc (sizeof (SAVED_FUNCTION));
  return (new);
}

static SAVED_F77_COMMON_PTR
allocate_saved_f77_common_node (void)
{
  SAVED_F77_COMMON_PTR new;

  new = (SAVED_F77_COMMON_PTR) xmalloc (sizeof (SAVED_F77_COMMON));
  return (new);
}

static COMMON_ENTRY_PTR
allocate_common_entry_node (void)
{
  COMMON_ENTRY_PTR new;

  new = (COMMON_ENTRY_PTR) xmalloc (sizeof (COMMON_ENTRY));
  return (new);
}
#endif

SAVED_F77_COMMON_PTR head_common_list = NULL;	/* Ptr to 1st saved COMMON  */
SAVED_F77_COMMON_PTR tail_common_list = NULL;	/* Ptr to last saved COMMON  */
SAVED_F77_COMMON_PTR current_common = NULL;	/* Ptr to current COMMON */

#if 0
static SAVED_BF_PTR saved_bf_list = NULL;	/* Ptr to (.bf,function) 
						   list */
static SAVED_BF_PTR saved_bf_list_end = NULL;	/* Ptr to above list's end */
static SAVED_BF_PTR current_head_bf_list = NULL;	/* Current head of above list
							 */

static SAVED_BF_PTR tmp_bf_ptr;	/* Generic temporary for use 
				   in macros */

/* The following function simply enters a given common block onto 
   the global common block chain */

static void
add_common_block (char *name, CORE_ADDR offset, int secnum, char *func_stab)
{
  SAVED_F77_COMMON_PTR tmp;
  char *c, *local_copy_func_stab;

  /* If the COMMON block we are trying to add has a blank 
     name (i.e. "#BLNK_COM") then we set it to __BLANK
     because the darn "#" character makes GDB's input 
     parser have fits. */


  if (STREQ (name, BLANK_COMMON_NAME_ORIGINAL) ||
      STREQ (name, BLANK_COMMON_NAME_MF77))
    {

      xfree (name);
      name = alloca (strlen (BLANK_COMMON_NAME_LOCAL) + 1);
      strcpy (name, BLANK_COMMON_NAME_LOCAL);
    }

  tmp = allocate_saved_f77_common_node ();

  local_copy_func_stab = xmalloc (strlen (func_stab) + 1);
  strcpy (local_copy_func_stab, func_stab);

  tmp->name = xmalloc (strlen (name) + 1);

  /* local_copy_func_stab is a stabstring, let us first extract the 
     function name from the stab by NULLing out the ':' character. */


  c = NULL;
  c = strchr (local_copy_func_stab, ':');

  if (c)
    *c = '\0';
  else
    error ("Malformed function STAB found in add_common_block()");


  tmp->owning_function = xmalloc (strlen (local_copy_func_stab) + 1);

  strcpy (tmp->owning_function, local_copy_func_stab);

  strcpy (tmp->name, name);
  tmp->offset = offset;
  tmp->next = NULL;
  tmp->entries = NULL;
  tmp->secnum = secnum;

  current_common = tmp;

  if (head_common_list == NULL)
    {
      head_common_list = tail_common_list = tmp;
    }
  else
    {
      tail_common_list->next = tmp;
      tail_common_list = tmp;
    }
}
#endif

/* The following function simply enters a given common entry onto 
   the "current_common" block that has been saved away. */

#if 0
static void
add_common_entry (struct symbol *entry_sym_ptr)
{
  COMMON_ENTRY_PTR tmp;


  /* The order of this list is important, since 
     we expect the entries to appear in decl.
     order when we later issue "info common" calls */

  tmp = allocate_common_entry_node ();

  tmp->next = NULL;
  tmp->symbol = entry_sym_ptr;

  if (current_common == NULL)
    error ("Attempt to add COMMON entry with no block open!");
  else
    {
      if (current_common->entries == NULL)
	{
	  current_common->entries = tmp;
	  current_common->end_of_entries = tmp;
	}
      else
	{
	  current_common->end_of_entries->next = tmp;
	  current_common->end_of_entries = tmp;
	}
    }
}
#endif

/* This routine finds the first encountred COMMON block named "name" */

#if 0
static SAVED_F77_COMMON_PTR
find_first_common_named (char *name)
{

  SAVED_F77_COMMON_PTR tmp;

  tmp = head_common_list;

  while (tmp != NULL)
    {
      if (STREQ (tmp->name, name))
	return (tmp);
      else
	tmp = tmp->next;
    }
  return (NULL);
}
#endif

/* This routine finds the first encountred COMMON block named "name" 
   that belongs to function funcname */

SAVED_F77_COMMON_PTR
find_common_for_function (char *name, char *funcname)
{

  SAVED_F77_COMMON_PTR tmp;

  tmp = head_common_list;

  while (tmp != NULL)
    {
      if (STREQ (tmp->name, name) && STREQ (tmp->owning_function, funcname))
	return (tmp);
      else
	tmp = tmp->next;
    }
  return (NULL);
}


#if 0

/* The following function is called to patch up the offsets 
   for the statics contained in the COMMON block named
   "name."  */

static void
patch_common_entries (SAVED_F77_COMMON_PTR blk, CORE_ADDR offset, int secnum)
{
  COMMON_ENTRY_PTR entry;

  blk->offset = offset;		/* Keep this around for future use. */

  entry = blk->entries;

  while (entry != NULL)
    {
      SYMBOL_VALUE (entry->symbol) += offset;
      SYMBOL_SECTION (entry->symbol) = secnum;

      entry = entry->next;
    }
  blk->secnum = secnum;
}

/* Patch all commons named "name" that need patching.Since COMMON
   blocks occur with relative infrequency, we simply do a linear scan on
   the name.  Eventually, the best way to do this will be a
   hashed-lookup.  Secnum is the section number for the .bss section
   (which is where common data lives). */

static void
patch_all_commons_by_name (char *name, CORE_ADDR offset, int secnum)
{

  SAVED_F77_COMMON_PTR tmp;

  /* For blank common blocks, change the canonical reprsentation 
     of a blank name */

  if ((STREQ (name, BLANK_COMMON_NAME_ORIGINAL)) ||
      (STREQ (name, BLANK_COMMON_NAME_MF77)))
    {
      xfree (name);
      name = alloca (strlen (BLANK_COMMON_NAME_LOCAL) + 1);
      strcpy (name, BLANK_COMMON_NAME_LOCAL);
    }

  tmp = head_common_list;

  while (tmp != NULL)
    {
      if (COMMON_NEEDS_PATCHING (tmp))
	if (STREQ (tmp->name, name))
	  patch_common_entries (tmp, offset, secnum);

      tmp = tmp->next;
    }
}
#endif

/* This macro adds the symbol-number for the start of the function 
   (the symbol number of the .bf) referenced by symnum_fcn to a 
   list.  This list, in reality should be a FIFO queue but since 
   #line pragmas sometimes cause line ranges to get messed up 
   we simply create a linear list.  This list can then be searched 
   first by a queueing algorithm and upon failure fall back to 
   a linear scan. */

#if 0
#define ADD_BF_SYMNUM(bf_sym,fcn_sym) \
  \
  if (saved_bf_list == NULL) \
{ \
    tmp_bf_ptr = allocate_saved_bf_node(); \
      \
	tmp_bf_ptr->symnum_bf = (bf_sym); \
	  tmp_bf_ptr->symnum_fcn = (fcn_sym);  \
	    tmp_bf_ptr->next = NULL; \
	      \
		current_head_bf_list = saved_bf_list = tmp_bf_ptr; \
		  saved_bf_list_end = tmp_bf_ptr; \
		  } \
else \
{  \
     tmp_bf_ptr = allocate_saved_bf_node(); \
       \
         tmp_bf_ptr->symnum_bf = (bf_sym);  \
	   tmp_bf_ptr->symnum_fcn = (fcn_sym);  \
	     tmp_bf_ptr->next = NULL;  \
	       \
		 saved_bf_list_end->next = tmp_bf_ptr;  \
		   saved_bf_list_end = tmp_bf_ptr; \
		   }
#endif

/* This function frees the entire (.bf,function) list */

#if 0
static void
clear_bf_list (void)
{

  SAVED_BF_PTR tmp = saved_bf_list;
  SAVED_BF_PTR next = NULL;

  while (tmp != NULL)
    {
      next = tmp->next;
      xfree (tmp);
      tmp = next;
    }
  saved_bf_list = NULL;
}
#endif

int global_remote_debug;

#if 0

static long
get_bf_for_fcn (long the_function)
{
  SAVED_BF_PTR tmp;
  int nprobes = 0;

  /* First use a simple queuing algorithm (i.e. look and see if the 
     item at the head of the queue is the one you want)  */

  if (saved_bf_list == NULL)
    internal_error (__FILE__, __LINE__,
		    "cannot get .bf node off empty list");

  if (current_head_bf_list != NULL)
    if (current_head_bf_list->symnum_fcn == the_function)
      {
	if (global_remote_debug)
	  fprintf_unfiltered (gdb_stderr, "*");

	tmp = current_head_bf_list;
	current_head_bf_list = current_head_bf_list->next;
	return (tmp->symnum_bf);
      }

  /* If the above did not work (probably because #line directives were 
     used in the sourcefile and they messed up our internal tables) we now do
     the ugly linear scan */

  if (global_remote_debug)
    fprintf_unfiltered (gdb_stderr, "\ndefaulting to linear scan\n");

  nprobes = 0;
  tmp = saved_bf_list;
  while (tmp != NULL)
    {
      nprobes++;
      if (tmp->symnum_fcn == the_function)
	{
	  if (global_remote_debug)
	    fprintf_unfiltered (gdb_stderr, "Found in %d probes\n", nprobes);
	  current_head_bf_list = tmp->next;
	  return (tmp->symnum_bf);
	}
      tmp = tmp->next;
    }

  return (-1);
}

static SAVED_FUNCTION_PTR saved_function_list = NULL;
static SAVED_FUNCTION_PTR saved_function_list_end = NULL;

static void
clear_function_list (void)
{
  SAVED_FUNCTION_PTR tmp = saved_function_list;
  SAVED_FUNCTION_PTR next = NULL;

  while (tmp != NULL)
    {
      next = tmp->next;
      xfree (tmp);
      tmp = next;
    }

  saved_function_list = NULL;
}
#endif