source: trunk/src/gcc/libobjc/encoding.c@ 2254

/* Encoding of types for Objective C.
   Copyright (C) 1993, 1995, 1996, 1997, 1998, 2000, 2002
   Free Software Foundation, Inc.
   Contributed by Kresten Krab Thorup
   Bitfield support by Ovidiu Predescu

This file is part of GNU CC.

GNU CC 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.

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

/* As a special exception, if you link this library with files
   compiled with GCC to produce an executable, this does not cause
   the resulting executable to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

#include "tconfig.h"
#include "objc-api.h"
#include "encoding.h"
#include <stdlib.h>

#undef  MAX
#define MAX(X, Y)                    \
  ({ typeof (X) __x = (X), __y = (Y); \
     (__x > __y ? __x : __y); })

#undef  MIN
#define MIN(X, Y)                    \
  ({ typeof (X) __x = (X), __y = (Y); \
     (__x < __y ? __x : __y); })

#undef  ROUND
#define ROUND(V, A) \
  ({ typeof (V) __v = (V); typeof (A) __a = (A); \
     __a * ((__v+__a - 1)/__a); })


/* Various hacks for objc_layout_record. These are used by the target
   macros. */

#define TREE_CODE(TYPE) *(TYPE)
#define TREE_TYPE(TREE) (TREE)

#define RECORD_TYPE     _C_STRUCT_B
#define UNION_TYPE      _C_UNION_B
#define QUAL_UNION_TYPE _C_UNION_B
#define ARRAY_TYPE      _C_ARY_B

#define REAL_TYPE       _C_DBL

#define VECTOR_TYPE     _C_VECTOR

#define TYPE_FIELDS(TYPE)     objc_skip_typespec (TYPE)

#define DECL_MODE(TYPE) *(TYPE)
#define TYPE_MODE(TYPE) *(TYPE)

#define DFmode          _C_DBL

#define get_inner_array_type(TYPE)      ((TYPE) + 1)

/* Some ports (eg ARM) allow the structure size boundary to be
   selected at compile-time.  We override the normal definition with
   one that has a constant value for this compilation.  */
#undef STRUCTURE_SIZE_BOUNDARY
#define STRUCTURE_SIZE_BOUNDARY (BITS_PER_UNIT * sizeof (struct{char a;}))

/* Some ROUND_TYPE_ALIGN macros use TARGET_foo, and consequently
   target_flags.  Define a dummy entry here to so we don't die.  */
/* ??? FIXME: As of 2002-06-21, the attribute `unused' doesn't seem to
   eliminate the warning.  */
static int __attribute__ ((__unused__)) target_flags = 0;

/*
  return the size of an object specified by type
*/

int
objc_sizeof_type (const char *type)
{
  /* Skip the variable name if any */
  if (*type == '"')
    {
      for (type++; *type++ != '"';)
        /* do nothing */;
    }

  switch (*type) {
  case _C_ID:
    return sizeof (id);
    break;

  case _C_CLASS:
    return sizeof (Class);
    break;

  case _C_SEL:
    return sizeof (SEL);
    break;

  case _C_CHR:
    return sizeof (char);
    break;

  case _C_UCHR:
    return sizeof (unsigned char);
    break;

  case _C_SHT:
    return sizeof (short);
    break;

  case _C_USHT:
    return sizeof (unsigned short);
    break;

  case _C_INT:
    return sizeof (int);
    break;

  case _C_UINT:
    return sizeof (unsigned int);
    break;

  case _C_LNG:
    return sizeof (long);
    break;

  case _C_ULNG:
    return sizeof (unsigned long);
    break;

  case _C_LNG_LNG:
    return sizeof (long long);
    break;

  case _C_ULNG_LNG:
    return sizeof (unsigned long long);
    break;

  case _C_FLT:
    return sizeof (float);
    break;

  case _C_DBL:
    return sizeof (double);
    break;

  case _C_VOID:
    return sizeof (void);
    break;

  case _C_PTR:
  case _C_ATOM:
  case _C_CHARPTR:
    return sizeof (char *);
    break;

  case _C_ARY_B:
    {
      int len = atoi (type + 1);
      while (isdigit ((unsigned char)*++type))
        ;
      return len * objc_aligned_size (type);
    }
    break;

  case _C_BFLD:
    {
      /* The new encoding of bitfields is: b 'position' 'type' 'size' */
      int position, size;
      int startByte, endByte;

      position = atoi (type + 1);
      while (isdigit ((unsigned char)*++type))
        ;
      size = atoi (type + 1);

      startByte = position / BITS_PER_UNIT;
      endByte = (position + size) / BITS_PER_UNIT;