gcc/config/i960/i960-c.c

   1 /* Intel 80960 specific, C compiler specific functions.
   2    Copyright (C) 1992, 1995, 1996, 1997, 1998, 1999, 2000
   3    Free Software Foundation, Inc.
   4    Contributed by Steven McGeady, Intel Corp.
   5    Additional Work by Glenn Colon-Bonet, Jonathan Shapiro, Andy Wilson
   6    Converted to GCC 2.0 by Jim Wilson and Michael Tiemann, Cygnus Support.
   7
   8 This file is part of GNU CC.
   9
  10 GNU CC is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 GNU CC is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU CC; see the file COPYING.  If not, write to
  22 the Free Software Foundation, 59 Temple Place - Suite 330,
  23 Boston, MA 02111-1307, USA.  */
  24
  25 #include "config.h"
  26 #include "system.h"
  27 #include "coretypes.h"
  28 #include "tm.h"
  29 #include "cpplib.h"
  30 #include "tree.h"
  31 #include "c-pragma.h"
  32 #include "toplev.h"
  33 #include "ggc.h"
  34 #include "tm_p.h"
  35
  36 /* Handle pragmas for compatibility with Intel's compilers.  */
  37
  38 /* NOTE: ic960 R3.0 pragma align definition:
  39
  40    #pragma align [(size)] | (identifier=size[,...])
  41    #pragma noalign [(identifier)[,...]]
  42
  43    (all parens are optional)
  44
  45    - size is [1,2,4,8,16]
  46    - noalign means size==1
  47    - applies only to component elements of a struct (and union?)
  48    - identifier applies to structure tag (only)
  49    - missing identifier means next struct
  50
  51    - alignment rules for bitfields need more investigation.
  52
  53    This implementation only handles the case of no identifiers.  */
  54
  55 void
  56 i960_pr_align (pfile)
  57      cpp_reader *pfile ATTRIBUTE_UNUSED;
  58 {
  59   tree number;
  60   enum cpp_ttype type;
  61   int align;
  62
  63   type = c_lex (&number);
  64   if (type == CPP_OPEN_PAREN)
  65     type = c_lex (&number);
  66   if (type == CPP_NAME)
  67     {
  68       warning ("sorry, not implemented: #pragma align NAME=SIZE");
  69       return;
  70     }
  71   if (type != CPP_NUMBER)
  72     {
  73       warning ("malformed #pragma align - ignored");
  74       return;
  75     }
  76
  77   align = TREE_INT_CST_LOW (number);
  78   switch (align)
  79     {
  80     case 0:
  81       /* Return to last alignment.  */
  82       align = i960_last_maxbitalignment / 8;
  83       /* Fall through.  */
  84     case 16:
  85     case 8:
  86     case 4:
  87     case 2:
  88     case 1:
  89       i960_last_maxbitalignment = i960_maxbitalignment;
  90       i960_maxbitalignment = align * 8;
  91       break;
  92
  93     default:
  94       /* Silently ignore bad values.  */
  95       break;
  96     }
  97 }
  98
  99 void
 100 i960_pr_noalign (pfile)
 101      cpp_reader *pfile ATTRIBUTE_UNUSED;
 102 {
 103   enum cpp_ttype type;
 104   tree number;
 105
 106   type = c_lex (&number);
 107   if (type == CPP_OPEN_PAREN)
 108     type = c_lex (&number);
 109   if (type == CPP_NAME)
 110     {
 111       warning ("sorry, not implemented: #pragma noalign NAME");
 112       return;
 113     }
 114
 115   i960_last_maxbitalignment = i960_maxbitalignment;
 116   i960_maxbitalignment = 8;
 117 }