1 /* Darwin support needed only by C/C++ frontends.
3 Free Software Foundation, Inc.
4 Contributed by Apple Computer Inc.
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
34 #define BAD(msgid) do { warning (msgid); return; } while (0)
36 /* Maintain a small stack of alignments. This is similar to pragma
37 pack's stack, but simpler. */
39 static void push_field_alignment PARAMS ((int));
40 static void pop_field_alignment PARAMS ((void));
42 typedef struct align_stack
45 struct align_stack * prev;
48 static struct align_stack * field_align_stack = NULL;
51 push_field_alignment (bit_alignment)
54 align_stack *entry = (align_stack *) xmalloc (sizeof (align_stack));
56 entry->alignment = maximum_field_alignment;
57 entry->prev = field_align_stack;
58 field_align_stack = entry;
60 maximum_field_alignment = bit_alignment;
64 pop_field_alignment ()
66 if (field_align_stack)
68 align_stack *entry = field_align_stack;
70 maximum_field_alignment = entry->alignment;
71 field_align_stack = entry->prev;
75 error ("too many #pragma options align=reset");
78 /* Handlers for Darwin-specific pragmas. */
81 darwin_pragma_ignore (pfile)
82 cpp_reader *pfile ATTRIBUTE_UNUSED;
87 /* #pragma options align={mac68k|power|reset} */
90 darwin_pragma_options (pfile)
91 cpp_reader *pfile ATTRIBUTE_UNUSED;
96 if (c_lex (&t) != CPP_NAME)
97 BAD ("malformed '#pragma options', ignoring");
98 arg = IDENTIFIER_POINTER (t);
99 if (strcmp (arg, "align"))
100 BAD ("malformed '#pragma options', ignoring");
101 if (c_lex (&t) != CPP_EQ)
102 BAD ("malformed '#pragma options', ignoring");
103 if (c_lex (&t) != CPP_NAME)
104 BAD ("malformed '#pragma options', ignoring");
106 if (c_lex (&x) != CPP_EOF)
107 warning ("junk at end of '#pragma options'");
109 arg = IDENTIFIER_POINTER (t);
110 if (!strcmp (arg, "mac68k"))
111 push_field_alignment (16);
112 else if (!strcmp (arg, "power"))
113 push_field_alignment (0);
114 else if (!strcmp (arg, "reset"))
115 pop_field_alignment ();
117 warning ("malformed '#pragma options align={mac68k|power|reset}', ignoring");
120 /* #pragma unused ([var {, var}*]) */
123 darwin_pragma_unused (pfile)
124 cpp_reader *pfile ATTRIBUTE_UNUSED;
129 if (c_lex (&x) != CPP_OPEN_PAREN)
130 BAD ("missing '(' after '#pragma unused', ignoring");
135 if (tok == CPP_NAME && decl)
137 tree local = IDENTIFIER_LOCAL_VALUE (decl);
138 if (local && (TREE_CODE (local) == PARM_DECL
139 || TREE_CODE (local) == VAR_DECL))
140 TREE_USED (local) = 1;
142 if (tok != CPP_COMMA)
147 if (tok != CPP_CLOSE_PAREN)
148 BAD ("missing ')' after '#pragma unused', ignoring");
150 if (c_lex (&x) != CPP_EOF)
151 warning ("junk at end of '#pragma unused'");