154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
/* Darwin support needed only by C/C++ frontends.
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Copyright (C) 2001
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Free Software Foundation, Inc.
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Contributed by Apple Computer Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "cpplib.h"
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#include "tree.h"
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#include "c-pragma.h"
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#include "c-lex.h"
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#include "c-tree.h"
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#include "toplev.h"
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#include "tm_p.h"
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/* Pragmas. */
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#define BAD(msgid) do { warning (msgid); return; } while (0)
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/* Maintain a small stack of alignments. This is similar to pragma
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pack's stack, but simpler. */
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static void push_field_alignment PARAMS ((int));
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static void pop_field_alignment PARAMS ((void));
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typedef struct align_stack
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{
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int alignment;
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struct align_stack * prev;
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} align_stack;
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static struct align_stack * field_align_stack = NULL;
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static void
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push_field_alignment (bit_alignment)
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int bit_alignment;
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{
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align_stack *entry = (align_stack *) xmalloc (sizeof (align_stack));
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entry->alignment = maximum_field_alignment;
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entry->prev = field_align_stack;
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field_align_stack = entry;
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maximum_field_alignment = bit_alignment;
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}
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static void
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pop_field_alignment ()
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{
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if (field_align_stack)
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{
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align_stack *entry = field_align_stack;
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maximum_field_alignment = entry->alignment;
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field_align_stack = entry->prev;
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free (entry);
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}
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else
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error ("too many #pragma options align=reset");
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}
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/* Handlers for Darwin-specific pragmas. */
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void
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darwin_pragma_ignore (pfile)
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cpp_reader *pfile ATTRIBUTE_UNUSED;
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{
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/* Do nothing. */
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}
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/* #pragma options align={mac68k|power|reset} */
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void
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darwin_pragma_options (pfile)
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cpp_reader *pfile ATTRIBUTE_UNUSED;
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{
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char *arg;
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tree t, x;
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if (c_lex (&t) != CPP_NAME)
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BAD ("malformed '#pragma options', ignoring");
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arg = IDENTIFIER_POINTER (t);
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if (strcmp (arg, "align"))
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BAD ("malformed '#pragma options', ignoring");
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if (c_lex (&t) != CPP_EQ)
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BAD ("malformed '#pragma options', ignoring");
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if (c_lex (&t) != CPP_NAME)
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BAD ("malformed '#pragma options', ignoring");
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if (c_lex (&x) != CPP_EOF)
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warning ("junk at end of '#pragma options'");
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arg = IDENTIFIER_POINTER (t);
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if (!strcmp (arg, "mac68k"))
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push_field_alignment (16);
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else if (!strcmp (arg, "power"))
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push_field_alignment (0);
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else if (!strcmp (arg, "reset"))
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pop_field_alignment ();
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else
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warning ("malformed '#pragma options align={mac68k|power|reset}', ignoring");
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}
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/* #pragma unused ([var {, var}*]) */
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void
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darwin_pragma_unused (pfile)
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cpp_reader *pfile ATTRIBUTE_UNUSED;
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{
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tree decl, x;
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int tok;
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if (c_lex (&x) != CPP_OPEN_PAREN)
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BAD ("missing '(' after '#pragma unused', ignoring");
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while (1)
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{
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tok = c_lex (&decl);
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if (tok == CPP_NAME && decl)
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{
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tree local = IDENTIFIER_LOCAL_VALUE (decl);
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if (local && (TREE_CODE (local) == PARM_DECL
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|| TREE_CODE (local) == VAR_DECL))
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TREE_USED (local) = 1;
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tok = c_lex (&x);
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if (tok != CPP_COMMA)
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break;
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}
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}
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if (tok != CPP_CLOSE_PAREN)
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BAD ("missing ')' after '#pragma unused', ignoring");
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if (c_lex (&x) != CPP_EOF)
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warning ("junk at end of '#pragma unused'");
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}
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