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 "cpplib.h"
28 #include "tree.h"
29 #include "c-pragma.h"
30 #include "toplev.h"
31 #include "ggc.h"
32 #include "tm_p.h"
33
34 /* Handle pragmas for compatibility with Intel's compilers. */
35
36 /* NOTE: ic960 R3.0 pragma align definition:
37
38 #pragma align [(size)] | (identifier=size[,...])
39 #pragma noalign [(identifier)[,...]]
40
41 (all parens are optional)
42
43 - size is [1,2,4,8,16]
44 - noalign means size==1
45 - applies only to component elements of a struct (and union?)
46 - identifier applies to structure tag (only)
47 - missing identifier means next struct
48
49 - alignment rules for bitfields need more investigation.
50
51 This implementation only handles the case of no identifiers. */
52
53 void
i960_pr_align(pfile)54 i960_pr_align (pfile)
55 cpp_reader *pfile ATTRIBUTE_UNUSED;
56 {
57 tree number;
58 enum cpp_ttype type;
59 int align;
60
61 type = c_lex (&number);
62 if (type == CPP_OPEN_PAREN)
63 type = c_lex (&number);
64 if (type == CPP_NAME)
65 {
66 warning ("sorry, not implemented: #pragma align NAME=SIZE");
67 return;
68 }
69 if (type != CPP_NUMBER)
70 {
71 warning ("malformed #pragma align - ignored");
72 return;
73 }
74
75 align = TREE_INT_CST_LOW (number);
76 switch (align)
77 {
78 case 0:
79 /* Return to last alignment. */
80 align = i960_last_maxbitalignment / 8;
81 /* Fall through. */
82 case 16:
83 case 8:
84 case 4:
85 case 2:
86 case 1:
87 i960_last_maxbitalignment = i960_maxbitalignment;
88 i960_maxbitalignment = align * 8;
89 break;
90
91 default:
92 /* Silently ignore bad values. */
93 break;
94 }
95 }
96
97 void
i960_pr_noalign(pfile)98 i960_pr_noalign (pfile)
99 cpp_reader *pfile ATTRIBUTE_UNUSED;
100 {
101 enum cpp_ttype type;
102 tree number;
103
104 type = c_lex (&number);
105 if (type == CPP_OPEN_PAREN)
106 type = c_lex (&number);
107 if (type == CPP_NAME)
108 {
109 warning ("sorry, not implemented: #pragma noalign NAME");
110 return;
111 }
112
113 i960_last_maxbitalignment = i960_maxbitalignment;
114 i960_maxbitalignment = 8;
115 }
116