/* Support routines for manipulating internal types for GDB.
   Copyright (C) 1992 Free Software Foundation, Inc.
   Contributed by Cygnus Support, using pieces from other GDB modules.

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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include <string.h>
#include "bfd.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbtypes.h"
#include "expression.h"
#include "language.h"
#include "target.h"
#include "value.h"
#include "demangle.h"

/* Alloc a new type structure and fill it with some defaults.  If
   OBJFILE is non-NULL, then allocate the space for the type structure
   in that objfile's type_obstack. */

struct type *
alloc_type (objfile)
     struct objfile *objfile;
{
  register struct type *type;

  /* Alloc the structure and start off with all fields zeroed. */

  if (objfile == NULL)
    {
      type  = (struct type *) xmalloc (sizeof (struct type));
    }
  else
    {
      type  = (struct type *) obstack_alloc (&objfile -> type_obstack,
					     sizeof (struct type));
    }
  (void) memset ((char *)type, 0, sizeof (struct type));

  /* Initialize the fields that might not be zero. */

  TYPE_CODE (type) = TYPE_CODE_UNDEF;
  TYPE_OBJFILE (type) = objfile;
  TYPE_VPTR_FIELDNO (type) = -1;

  return (type);
}

/* Lookup a pointer to a type TYPE.  TYPEPTR, if nonzero, points
   to a pointer to memory where the pointer type should be stored.
   If *TYPEPTR is zero, update it to point to the pointer type we return.
   We allocate new memory if needed.  */

struct type *
make_pointer_type (type, typeptr)
     struct type *type;
     struct type **typeptr;
{
  register struct type *ntype;		/* New type */
  struct objfile *objfile;

  ntype = TYPE_POINTER_TYPE (type);

  if (ntype) 
    if (typeptr == 0)		
      return ntype;	/* Don't care about alloc, and have new type.  */
    else if (*typeptr == 0)
      {
	*typeptr = ntype;	/* Tracking alloc, and we have new type.  */
	return ntype;
      }

  if (typeptr == 0 || *typeptr == 0)	/* We'll need to allocate one.  */
    {
      ntype = alloc_type (TYPE_OBJFILE (type));
      if (typeptr)
	*typeptr = ntype;
    }
  else				/* We have storage, but need to reset it.  */
    {
      ntype = *typeptr;
      objfile = TYPE_OBJFILE (ntype);
      memset ((char *)ntype, 0, sizeof (struct type));
      TYPE_OBJFILE (ntype) = objfile;
    }

  TYPE_TARGET_TYPE (ntype) = type;
  TYPE_POINTER_TYPE (type) = ntype;

  /* FIXME!  Assume the machine has only one representation for pointers!  */

  TYPE_LENGTH (ntype) = TARGET_PTR_BIT / TARGET_CHAR_BIT;
  TYPE_CODE (ntype) = TYPE_CODE_PTR;

  /* pointers are unsigned */
  TYPE_FLAGS (ntype) |= TYPE_FLAG_UNSIGNED;
  
  if (!TYPE_POINTER_TYPE (type))	/* Remember it, if don't have one.  */
    TYPE_POINTER_TYPE (type) = ntype;

  return ntype;
}

/* Given a type TYPE, return a type of pointers to that type.
   May need to construct such a type if this is the first use.  */

struct type *
lookup_pointer_type (type)
     struct type *type;
{
  return make_pointer_type (type, (struct type **)0);
}

/* Lookup a C++ `reference' to a type TYPE.  TYPEPTR, if nonzero, points
   to a pointer to memory where the reference type should be stored.
   If *TYPEPTR is zero, update it to point to the reference type we return.
   We allocate new memory if needed.  */

struct type *
make_reference_type (type, typeptr)
     struct type *type;
     struct type **typeptr;
{
  register struct type *ntype;		/* New type */
  struct objfile *objfile;

  ntype = TYPE_REFERENCE_TYPE (type);

  if (ntype) 
    if (typeptr == 0)		
      return ntype;	/* Don't care about alloc, and have new type.  */
    else if (*typeptr == 0)
      {
	*typeptr = ntype;	/* Tracking alloc, and we have new type.  */
	return ntype;
      }

  if (typeptr == 0 || *typeptr == 0)	/* We'll need to allocate one.  */
    {
      ntype = alloc_type (TYPE_OBJFILE (type));
      if (typeptr)
	*typeptr = ntype;
    }
  else				/* We have storage, but need to reset it.  */
    {
      ntype = *typeptr;
      objfile = TYPE_OBJFILE (ntype);
      memset ((char *)ntype, 0, sizeof (struct type));
      TYPE_OBJFILE (ntype) = objfile;
    }

  TYPE_TARGET_TYPE (ntype) = type;
  TYPE_REFERENCE_TYPE (type) = ntype;

  /* FIXME!  Assume the machine has only one representation for references,
     and that it matches the (only) representation for pointers!  */

  TYPE_LENGTH (ntype) = TARGET_PTR_BIT / TARGET_CHAR_BIT;
  TYPE_CODE (ntype) = TYPE_CODE_REF;
  
  if (!TYPE_REFERENCE_TYPE (type))	/* Remember it, if don't have one.  */
    TYPE_REFERENCE_TYPE (type) = ntype;

  return ntype;
}

/* Same as above, but caller doesn't care about memory allocation details.  */

struct type *
lookup_reference_type (type)
     struct type *type;
{
  return make_reference_type (type, (struct type **)0);
}

/* Lookup a function type that returns type TYPE.  TYPEPTR, if nonzero, points
   to a pointer to memory where the function type should be stored.
   If *TYPEPTR is zero, update it to point to the function type we return.
   We allocate new memory if needed.  */

struct type *
make_function_type (type, typeptr)
     struct type *type;
     struct type **typeptr;
{
  register struct type *ntype;		/* New type */
  struct objfile *objfile;

  ntype = TYPE_FUNCTION_TYPE (type);

  if (ntype) 
    if (typeptr == 0)		
      return ntype;	/* Don't care about alloc, and have new type.  */
    else if (*typeptr == 0)
      {
	*typeptr = ntype;	/* Tracking alloc, and we have new type.  */
	return ntype;
      }

  if (typeptr == 0 || *typeptr == 0)	/* We'll need to allocate one.  */
    {
      ntype = alloc_type (TYPE_OBJFILE (type));
      if (typeptr)
	*typeptr = ntype;
    }
  else				/* We have storage, but need to reset it.  */
    {
      ntype = *typeptr;
      objfile = TYPE_OBJFILE (ntype);
      memset ((char *)ntype, 0, sizeof (struct type));
      TYPE_OBJFILE (ntype) = objfile;
    }

  TYPE_TARGET_TYPE (ntype) = type;
  TYPE_FUNCTION_TYPE (type) = ntype;

  TYPE_LENGTH (ntype) = 1;
  TYPE_CODE (ntype) = TYPE_CODE_FUNC;
  
  if (!TYPE_FUNCTION_TYPE (type))	/* Remember it, if don't have one.  */
    TYPE_FUNCTION_TYPE (type) = ntype;

  return ntype;
}


/* Given a type TYPE, return a type of functions that return that type.
   May need to construct such a type if this is the first use.  */

struct type *
lookup_function_type (type)
     struct type *type;
{
  return make_function_type (type, (struct type **)0);
}

/* Implement direct support for MEMBER_TYPE in GNU C++.
   May need to construct such a type if this is the first use.
   The TYPE is the type of the member.  The DOMAIN is the type
   of the aggregate that the member belongs to.  */

struct type *
lookup_member_type (type, domain)
     struct type *type;
     struct type *domain;
{
  register struct type *mtype;

  mtype = alloc_type (TYPE_OBJFILE (type));
  smash_to_member_type (mtype, domain, type);
  return (mtype);
}

/* Allocate a stub method whose return type is TYPE.  
   This apparently happens for speed of symbol reading, since parsing
   out the arguments to the method is cpu-intensive, the way we are doing
   it.  So, we will fill in arguments later.
   This always returns a fresh type.   */

struct type *
allocate_stub_method (type)
     struct type *type;
{
  struct type *mtype;

  mtype = alloc_type (TYPE_OBJFILE (type));
  TYPE_TARGET_TYPE (mtype) = type;
  /*  _DOMAIN_TYPE (mtype) = unknown yet */
  /*  _ARG_TYPES (mtype) = unknown yet */
  TYPE_FLAGS (mtype) = TYPE_FLAG_STUB;
  TYPE_CODE (mtype) = TYPE_CODE_METHOD;
  TYPE_LENGTH (mtype) = 1;
  return (mtype);
}

/* Create an array type.  Elements will be of type TYPE, and there will
   be NUM of them.

   Eventually this should be extended to take two more arguments which
   specify the bounds of the array and the type of the index.
   It should also be changed to be a "lookup" function, with the
   appropriate data structures added to the type field.
   Then read array type should call here.  */

struct type *
create_array_type (element_type, number)
     struct type *element_type;
     int number;
{
  struct type *result_type;
  struct type *range_type;

  result_type = alloc_type (TYPE_OBJFILE (element_type));

  TYPE_CODE (result_type) = TYPE_CODE_ARRAY;
  TYPE_TARGET_TYPE (result_type) = element_type;
  TYPE_LENGTH (result_type) = number * TYPE_LENGTH (element_type);
  TYPE_NFIELDS (result_type) = 1;
  TYPE_FIELDS (result_type) = (struct field *)
    obstack_alloc (&TYPE_OBJFILE (result_type) -> type_obstack,
		   sizeof (struct field));

  {
    /* Create range type.  */
    range_type = alloc_type (TYPE_OBJFILE (result_type));
    TYPE_CODE (range_type) = TYPE_CODE_RANGE;
    TYPE_TARGET_TYPE (range_type) = builtin_type_int;  /* FIXME */

    /* This should never be needed.  */
    TYPE_LENGTH (range_type) = sizeof (int);

    TYPE_NFIELDS (range_type) = 2;
    TYPE_FIELDS (range_type) = (struct field *)
      obstack_alloc (&TYPE_OBJFILE (range_type) -> type_obstack,
		     2 * sizeof (struct field));
    TYPE_FIELD_BITPOS (range_type, 0) = 0; /* FIXME */
    TYPE_FIELD_BITPOS (range_type, 1) = number-1; /* FIXME */
    TYPE_FIELD_TYPE (range_type, 0) = builtin_type_int; /* FIXME */
    TYPE_FIELD_TYPE (range_type, 1) = builtin_type_int; /* FIXME */
  }
  TYPE_FIELD_TYPE(result_type,0)=range_type;
  TYPE_VPTR_FIELDNO (result_type) = -1;

  return (result_type);
}


/* Smash TYPE to be a type of members of DOMAIN with type TO_TYPE. 
   A MEMBER is a wierd thing -- it amounts to a typed offset into
   a struct, e.g. "an int at offset 8".  A MEMBER TYPE doesn't
   include the offset (that's the value of the MEMBER itself), but does
   include the structure type into which it points (for some reason).

   When "smashing" the type, we preserve the objfile that the
   old type pointed to, since we aren't changing where the type is actually
   allocated.  */

void
smash_to_member_type (type, domain, to_type)
     struct type *type;
     struct type *domain;
     struct type *to_type;
{
  struct objfile *objfile;

  objfile = TYPE_OBJFILE (type);

  (void) memset ((char *)type, 0, sizeof (struct type));
  TYPE_OBJFILE (type) = objfile;
  TYPE_TARGET_TYPE (type) = to_type;
  TYPE_DOMAIN_TYPE (type) = domain;
  TYPE_LENGTH (type) = 1;	/* In practice, this is never needed.  */
  TYPE_CODE (type) = TYPE_CODE_MEMBER;
}

/* Smash TYPE to be a type of method of DOMAIN with type TO_TYPE.
   METHOD just means `function that gets an extra "this" argument'.

   When "smashing" the type, we preserve the objfile that the
   old type pointed to, since we aren't changing where the type is actually
   allocated.  */

void
smash_to_method_type (type, domain, to_type, args)
     struct type *type;
     struct type *domain;
     struct type *to_type;
     struct type **args;
{
  struct objfile *objfile;

  objfile = TYPE_OBJFILE (type);

  (void) memset ((char *)type, 0, sizeof (struct type));
  TYPE_OBJFILE (type) = objfile;
  TYPE_TARGET_TYPE (type) = to_type;
  TYPE_DOMAIN_TYPE (type) = domain;
  TYPE_ARG_TYPES (type) = args;
  TYPE_LENGTH (type) = 1;	/* In practice, this is never needed.  */
  TYPE_CODE (type) = TYPE_CODE_METHOD;
}

/* Return a typename for a struct/union/enum type
   without the tag qualifier.  If the type has a NULL name,
   NULL is returned.  */

char *
type_name_no_tag (type)
     register const struct type *type;
{
  register char *name;

  if ((name = TYPE_NAME (type)) != NULL)
    {
      switch (TYPE_CODE (type))
	{
	  case TYPE_CODE_STRUCT:
	    if(!strncmp (name, "struct ", 7))
	      {
		name += 7;
	      }
	    break;
	  case TYPE_CODE_UNION:
	    if(!strncmp (name, "union ", 6))
	      {
		name += 6;
	      }
	    break;
	  case TYPE_CODE_ENUM:
	    if(!strncmp (name, "enum ", 5))
	      {
		name += 5;
	      }
	    break;
	  default:		/* To avoid -Wall warnings */
	    break;
	}
    }
  return (name);
}

/* Lookup a primitive type named NAME. 
   Return zero if NAME is not a primitive type.*/

struct type *
lookup_primitive_typename (name)
     char *name;
{
   struct type ** const *p;

   for (p = current_language -> la_builtin_type_vector; *p != NULL; p++)
     {
       if (!strcmp ((**p) -> name, name))
	 {
	   return (**p);
	 }
     }
   return (NULL); 
}

/* Lookup a typedef or primitive type named NAME,
   visible in lexical block BLOCK.
   If NOERR is nonzero, return zero if NAME is not suitably defined.  */

struct type *
lookup_typename (name, block, noerr)
     char *name;
     struct block *block;
     int noerr;
{
  register struct symbol *sym;
  register struct type *tmp;

  sym = lookup_symbol (name, block, VAR_NAMESPACE, 0, (struct symtab **) NULL);
  if (sym == NULL || SYMBOL_CLASS (sym) != LOC_TYPEDEF)
    {
      tmp = lookup_primitive_typename (name);
      if (tmp)
	{
	  return (tmp);
	}
      else if (!tmp && noerr)
	{
	  return (NULL);
	}
      else
	{
	  error ("No type named %s.", name);
	}
    }
  return (SYMBOL_TYPE (sym));
}

struct type *
lookup_unsigned_typename (name)
     char *name;
{
  char *uns = alloca (strlen (name) + 10);

  strcpy (uns, "unsigned ");
  strcpy (uns + 9, name);
  return (lookup_typename (uns, (struct block *) NULL, 0));
}

/* Lookup a structure type named "struct NAME",
   visible in lexical block BLOCK.  */

struct type *
lookup_struct (name, block)
     char *name;
     struct block *block;
{
  register struct symbol *sym;

  sym = lookup_symbol (name, block, STRUCT_NAMESPACE, 0,
		       (struct symtab **) NULL);

  if (sym == NULL)
    {
      error ("No struct type named %s.", name);
    }
  if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_STRUCT)
    {
      error ("This context has class, union or enum %s, not a struct.", name);
    }
  return (SYMBOL_TYPE (sym));
}

/* Lookup a union type named "union NAME",
   visible in lexical block BLOCK.  */

struct type *
lookup_union (name, block)
     char *name;
     struct block *block;
{
  register struct symbol *sym;

  sym = lookup_symbol (name, block, STRUCT_NAMESPACE, 0,
		       (struct symtab **) NULL);

  if (sym == NULL)
    {
      error ("No union type named %s.", name);
    }
  if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_UNION)
    {
      error ("This context has class, struct or enum %s, not a union.", name);
    }
  return (SYMBOL_TYPE (sym));
}

/* Lookup an enum type named "enum NAME",
   visible in lexical block BLOCK.  */

struct type *
lookup_enum (name, block)
     char *name;
     struct block *block;
{
  register struct symbol *sym;

  sym = lookup_symbol (name, block, STRUCT_NAMESPACE, 0, 
		       (struct symtab **) NULL);
  if (sym == NULL)
    {
      error ("No enum type named %s.", name);
    }
  if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_ENUM)
    {
      error ("This context has class, struct or union %s, not an enum.", name);
    }
  return (SYMBOL_TYPE (sym));
}

/* Lookup a template type named "template NAME<TYPE>",
   visible in lexical block BLOCK.  */

struct type *
lookup_template_type (name, type, block)
     char *name;
     struct type *type;
     struct block *block;
{
  struct symbol *sym;
  char *nam = (char*) alloca(strlen(name) + strlen(type->name) + 4);
  strcpy (nam, name);
  strcat (nam, "<");
  strcat (nam, type->name);
  strcat (nam, " >");	/* FIXME, extra space still introduced in gcc? */

  sym = lookup_symbol (nam, block, VAR_NAMESPACE, 0, (struct symtab **)NULL);

  if (sym == NULL)
    {
      error ("No template type named %s.", name);
    }
  if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_STRUCT)
    {
      error ("This context has class, union or enum %s, not a struct.", name);
    }
  return (SYMBOL_TYPE (sym));
}

/* Given a type TYPE, lookup the type of the component of type named
   NAME.  
   If NOERR is nonzero, return zero if NAME is not suitably defined.  */

struct type *
lookup_struct_elt_type (type, name, noerr)
     struct type *type;
     char *name;
    int noerr;
{
  int i;

  if (TYPE_CODE (type) != TYPE_CODE_STRUCT &&
      TYPE_CODE (type) != TYPE_CODE_UNION)
    {
      target_terminal_ours ();
      fflush (stdout);
      fprintf (stderr, "Type ");
      type_print (type, "", stderr, -1);
      error (" is not a structure or union type.");
    }

  check_stub_type (type);

  for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--)
    {
      char *t_field_name = TYPE_FIELD_NAME (type, i);

      if (t_field_name && !strcmp (t_field_name, name))
	{
	  return TYPE_FIELD_TYPE (type, i);
	}
    }

  /* OK, it's not in this class.  Recursively check the baseclasses.  */
  for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
    {
      struct type *t;

      t = lookup_struct_elt_type (TYPE_BASECLASS (type, i), name, 0);
      if (t != NULL)
	{
	  return t;
	}
    }

  if (noerr)
    {
      return NULL;
    }
  
  target_terminal_ours ();
  fflush (stdout);
  fprintf (stderr, "Type ");
  type_print (type, "", stderr, -1);
  fprintf (stderr, " has no component named ");
  fputs_filtered (name, stderr);
  error (".");
  return (struct type *)-1;	/* For lint */
}

/* This function is really horrible, but to avoid it, there would need
   to be more filling in of forward references.  */

void
fill_in_vptr_fieldno (type)
     struct type *type;
{
  if (TYPE_VPTR_FIELDNO (type) < 0)
    {
      int i;
      for (i = 1; i < TYPE_N_BASECLASSES (type); i++)
	{
	  fill_in_vptr_fieldno (TYPE_BASECLASS (type, i));
	  if (TYPE_VPTR_FIELDNO (TYPE_BASECLASS (type, i)) >= 0)
	    {
	      TYPE_VPTR_FIELDNO (type)
		= TYPE_VPTR_FIELDNO (TYPE_BASECLASS (type, i));
	      TYPE_VPTR_BASETYPE (type)
		= TYPE_VPTR_BASETYPE (TYPE_BASECLASS (type, i));
	      break;
	    }
	}
    }
}

/* Added by Bryan Boreham, Kewill, Sun Sep 17 18:07:17 1989.

   If this is a stubbed struct (i.e. declared as struct foo *), see if
   we can find a full definition in some other file. If so, copy this
   definition, so we can use it in future.  If not, set a flag so we 
   don't waste too much time in future.  (FIXME, this doesn't seem
   to be happening...)

   This used to be coded as a macro, but I don't think it is called 
   often enough to merit such treatment.
*/

struct complaint stub_noname_complaint =
  {"stub type has NULL name", 0, 0};

void 
check_stub_type (type)
     struct type *type;
{
  if (TYPE_FLAGS(type) & TYPE_FLAG_STUB)
    {
      char* name = type_name_no_tag (type);
      struct symbol *sym;
      if (name == NULL)
	{
	  complain (&stub_noname_complaint, 0);
	  return;
	}
      sym = lookup_symbol (name, 0, STRUCT_NAMESPACE, 0, 
			   (struct symtab **) NULL);
      if (sym)
	{
	  memcpy ((char *)type, (char *)SYMBOL_TYPE(sym), sizeof (struct type));
	}
    }
}

/* Ugly hack to convert method stubs into method types.

   He ain't kiddin'.  This demangles the name of the method into a string
   including argument types, parses out each argument type, generates
   a string casting a zero to that type, evaluates the string, and stuffs
   the resulting type into an argtype vector!!!  Then it knows the type
   of the whole function (including argument types for overloading),
   which info used to be in the stab's but was removed to hack back
   the space required for them.  */

void
check_stub_method (type, i, j)
     struct type *type;
     int i;
     int j;
{
  struct fn_field *f;
  char *mangled_name = gdb_mangle_name (type, i, j);
  char *demangled_name = cplus_demangle (mangled_name, DMGL_PARAMS);
  char *argtypetext, *p;
  int depth = 0, argcount = 1;
  struct type **argtypes;
  struct type *mtype;

  if (demangled_name == NULL)
    {
      error ("Internal: Cannot demangle mangled name `%s'.", mangled_name);
    }

  /* Now, read in the parameters that define this type.  */
  argtypetext = strchr (demangled_name, '(') + 1;
  p = argtypetext;
  while (*p)
    {
      if (*p == '(')
	{
	  depth += 1;
	}
      else if (*p == ')')
	{
	  depth -= 1;
	}
      else if (*p == ',' && depth == 0)
	{
	  argcount += 1;
	}

      p += 1;
    }

  /* We need two more slots: one for the THIS pointer, and one for the
     NULL [...] or void [end of arglist].  */

  argtypes = (struct type **)
    obstack_alloc (&TYPE_OBJFILE (type) -> type_obstack,
		   (argcount+2) * sizeof (struct type *));
  p = argtypetext;
  argtypes[0] = lookup_pointer_type (type);
  argcount = 1;

  if (*p != ')')			/* () means no args, skip while */
    {
      depth = 0;
      while (*p)
	{
	  if (depth <= 0 && (*p == ',' || *p == ')'))
	    {
	      argtypes[argcount] =
		  parse_and_eval_type (argtypetext, p - argtypetext);
	      argcount += 1;
	      argtypetext = p + 1;
	    }

	  if (*p == '(')
	    {
	      depth += 1;
	    }
	  else if (*p == ')')
	    {
	      depth -= 1;
	    }

	  p += 1;
	}
    }

  if (p[-2] != '.')			/* ... */
    {
      argtypes[argcount] = builtin_type_void;	/* Ellist terminator */
    }
  else
    {
      argtypes[argcount] = NULL;		/* List terminator */
    }

  free (demangled_name);

  f = TYPE_FN_FIELDLIST1 (type, i);
  TYPE_FN_FIELD_PHYSNAME (f, j) = mangled_name;

  /* Now update the old "stub" type into a real type.  */
  mtype = TYPE_FN_FIELD_TYPE (f, j);
  TYPE_DOMAIN_TYPE (mtype) = type;
  TYPE_ARG_TYPES (mtype) = argtypes;
  TYPE_FLAGS (mtype) &= ~TYPE_FLAG_STUB;
  TYPE_FN_FIELD_STUB (f, j) = 0;
}

const struct cplus_struct_type cplus_struct_default;

void
allocate_cplus_struct_type (type)
     struct type *type;
{
  if (!HAVE_CPLUS_STRUCT (type))
    {
      TYPE_CPLUS_SPECIFIC (type) = (struct cplus_struct_type *)
	obstack_alloc (&current_objfile -> type_obstack,
		       sizeof (struct cplus_struct_type));
      *(TYPE_CPLUS_SPECIFIC(type)) = cplus_struct_default;
    }
}

/* Helper function to initialize the standard scalar types.  */

struct type *
init_type (code, length, flags, name, objfile)
     enum type_code code;
     int length;
     int flags;
     char *name;
     struct objfile *objfile;
{
  register struct type *type;

  type = alloc_type (objfile);
  TYPE_CODE (type) = code;
  TYPE_LENGTH (type) = length;
  TYPE_FLAGS (type) |= flags;
  TYPE_NAME (type) = name;

  /* C++ fancies.  */

  if (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION)
    {
      INIT_CPLUS_SPECIFIC (type);
    }
  return (type);
}

/* Look up a fundamental type for the specified objfile.
   May need to construct such a type if this is the first use.

   Some object file formats (ELF, COFF, etc) do not define fundamental
   types such as "int" or "double".  Others (stabs for example), do
   define fundamental types.

   For the formats which don't provide fundamental types, gdb can create
   such types, using defaults reasonable for the current target machine.

   FIXME:  Some compilers distinguish explicitly signed integral types
   (signed short, signed int, signed long) from "regular" integral types
   (short, int, long) in the debugging information.  There is some dis-
   agreement as to how useful this feature is.  In particular, gcc does
   not support this.  Also, only some debugging formats allow the
   distinction to be passed on to a debugger.  For now, we always just
   use "short", "int", or "long" as the type name, for both the implicit
   and explicitly signed types.  This also makes life easier for the
   gdb test suite since we don't have to account for the differences
   in output depending upon what the compiler and debugging format
   support.  We will probably have to re-examine the issue when gdb
   starts taking it's fundamental type information directly from the
   debugging information supplied by the compiler.  fnf@cygnus.com */

struct type *
lookup_fundamental_type (objfile, typeid)
     struct objfile *objfile;
     int typeid;
{
  register struct type *type = NULL;
  register struct type **typep;
  register int nbytes;

  if (typeid < 0 || typeid >= FT_NUM_MEMBERS)
    {
      error ("internal error - invalid fundamental type id %d", typeid);
    }
  else
    {
      /* If this is the first time we */
      if (objfile -> fundamental_types == NULL)
	{
	  nbytes = FT_NUM_MEMBERS * sizeof (struct type *);
	  objfile -> fundamental_types = (struct type **)
	    obstack_alloc (&objfile -> type_obstack, nbytes);
	  (void) memset ((char *)objfile -> fundamental_types, 0, nbytes);
	}
      typep = objfile -> fundamental_types + typeid;
      if ((type = *typep) == NULL)
	{
	  switch (typeid)
	    {
	      default:
	        error ("internal error: unhandled type id %d", typeid);
		break;
	      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_INT,
				  TARGET_INT_BIT / TARGET_CHAR_BIT,
				  TYPE_FLAG_UNSIGNED,
				  "boolean", objfile);
		break;
	      case FT_STRING:
		type = init_type (TYPE_CODE_PASCAL_ARRAY,
				  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,
				  "char", objfile);
		break;
	      case FT_SIGNED_CHAR:
		type = init_type (TYPE_CODE_INT,
				  TARGET_CHAR_BIT / TARGET_CHAR_BIT,
				  TYPE_FLAG_SIGNED,
				  "signed char", objfile);
		break;
	      case FT_UNSIGNED_CHAR:
		type = init_type (TYPE_CODE_INT,
				  TARGET_CHAR_BIT / TARGET_CHAR_BIT,
				  TYPE_FLAG_UNSIGNED,
				  "unsigned char", objfile);
		break;
	      case FT_SHORT:
		type = init_type (TYPE_CODE_INT,
				  TARGET_SHORT_BIT / TARGET_CHAR_BIT,
				  0,
				  "short", objfile);
		break;
	      case FT_SIGNED_SHORT:
		type = init_type (TYPE_CODE_INT,
				  TARGET_SHORT_BIT / TARGET_CHAR_BIT,
				  TYPE_FLAG_SIGNED,
				  "short", objfile);	/* FIXME -fnf */
		break;
	      case FT_UNSIGNED_SHORT:
		type = init_type (TYPE_CODE_INT,
				  TARGET_SHORT_BIT / TARGET_CHAR_BIT,
				  TYPE_FLAG_UNSIGNED,
				  "unsigned short", objfile);
		break;
	      case FT_INTEGER:
		type = init_type (TYPE_CODE_INT,
				  TARGET_INT_BIT / TARGET_CHAR_BIT,
				  0,
				  "int", objfile);
		break;
	      case FT_SIGNED_INTEGER:
		type = init_type (TYPE_CODE_INT,
				  TARGET_INT_BIT / TARGET_CHAR_BIT,
				  TYPE_FLAG_SIGNED,
				  "int", objfile);	/* FIXME -fnf */
		break;
	      case FT_UNSIGNED_INTEGER:
		type = init_type (TYPE_CODE_INT,
				  TARGET_INT_BIT / TARGET_CHAR_BIT,
				  TYPE_FLAG_UNSIGNED,
				  "unsigned int", 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,
				  TYPE_FLAG_SIGNED,
				  "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,
				  TYPE_FLAG_SIGNED,
				  "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,
				  "float", objfile);
		break;
	      case FT_DBL_PREC_FLOAT:
		type = init_type (TYPE_CODE_FLT,
				  TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
				  0,
				  "double", 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,
				  "long double", objfile);
		break;
	      case FT_COMPLEX:
		type = init_type (TYPE_CODE_FLT,
				  TARGET_COMPLEX_BIT / TARGET_CHAR_BIT,
				  0,
				  "complex", objfile);
		break;
	      case FT_DBL_PREC_COMPLEX:
		type = init_type (TYPE_CODE_FLT,
				  TARGET_DOUBLE_COMPLEX_BIT / TARGET_CHAR_BIT,
				  0,
				  "double complex", objfile);
		break;
	      case FT_EXT_PREC_COMPLEX:
		type = init_type (TYPE_CODE_FLT,
				  TARGET_DOUBLE_COMPLEX_BIT / TARGET_CHAR_BIT,
				  0,
				  "long double complex", objfile);
		break;
	    }
	  /* Install the newly created type in the objfile's fundamental_types
	     vector. */
	  *typep = type;
	}
    }
  return (type);
}