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/* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
Copyright (C) 1992, 1997, 1998 Free Software Foundation, Inc.
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. */
#include "config.h"
#include "system.h"
#include "rtl.h"
#include "tree.h"
#include "except.h"
#include "function.h"
#include "defaults.h"
#include "c-pragma.h"
#include "flags.h"
#include "toplev.h"
#ifdef HANDLE_SYSV_PRAGMA
/* When structure field packing is in effect, this variable is the
number of bits to use as the maximum alignment. When packing is not
in effect, this is zero. */
extern int maximum_field_alignment;
/* Handle one token of a pragma directive. TOKEN is the
current token, and STRING is its printable form.
Return zero if an entire pragma was parsed, but it was
flawed in some way. Return non-zero in all other cases. */
int
handle_pragma_token (string, token)
char *string;
tree token;
{
static enum pragma_state state = ps_start, type;
static char *name;
static char *value;
static int align;
if (string == NULL)
{
int ret_val = 1;
if (type == ps_pack)
{
if (state == ps_right)
maximum_field_alignment = align * 8;
else
{
warning ("malformed `#pragma pack'");
ret_val = 0;
}
}
else if (type == ps_bad)
ret_val = 0;
else if (type == ps_weak)
{
#ifdef HANDLE_PRAGMA_WEAK
if (HANDLE_PRAGMA_WEAK)
handle_pragma_weak (state, name, value);
#endif /* HANDLE_PRAGMA_WEAK */
}
type = state = ps_start;
return ret_val;
}
switch (state)
{
case ps_start:
if (token && TREE_CODE (token) == IDENTIFIER_NODE)
{
if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0)
type = state = ps_pack;
#ifdef HANDLE_PRAGMA_WEAK
else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0)
type = state = ps_weak;
#endif
else
type = state = ps_done;
}
else
type = state = ps_done;
break;
#ifdef HANDLE_PRAGMA_WEAK
case ps_weak:
if (token && TREE_CODE (token) == IDENTIFIER_NODE)
{
name = IDENTIFIER_POINTER (token);
state = ps_name;
}
else
state = ps_bad;
break;
#endif
case ps_name:
state = (strcmp (string, "=") ? ps_bad : ps_equals);
break;
case ps_equals:
if (token && TREE_CODE (token) == IDENTIFIER_NODE)
{
value = IDENTIFIER_POINTER (token);
state = ps_value;
}
else
state = ps_bad;
break;
case ps_value:
state = ps_bad;
break;
case ps_pack:
if (strcmp (string, "(") == 0)
state = ps_left;
else
state = ps_bad;
break;
case ps_left:
if (token && TREE_CODE (token) == INTEGER_CST
&& TREE_INT_CST_HIGH (token) == 0)
switch (TREE_INT_CST_LOW (token))
{
case 1:
case 2:
case 4:
align = TREE_INT_CST_LOW (token);
state = ps_align;
break;
default:
state = ps_bad;
}
else if (! token && strcmp (string, ")") == 0)
{
align = 0;
state = ps_right;
}
else
state = ps_bad;
break;
case ps_align:
if (strcmp (string, ")") == 0)
state = ps_right;
else
state = ps_bad;
break;
case ps_right:
state = ps_bad;
break;
case ps_bad:
case ps_done:
break;
default:
abort ();
}
return 1;
}
#endif /* HANDLE_SYSV_PRAGMA */
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