182 lines
4.0 KiB
C
182 lines
4.0 KiB
C
/* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
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Copyright (C) 1992, 1997 Free Software Foundation, 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 "rtl.h"
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#include "tree.h"
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#include "except.h"
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#include "function.h"
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#include "defaults.h"
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#include "c-pragma.h"
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#include "flags.h"
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#include "toplev.h"
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#ifdef HANDLE_SYSV_PRAGMA
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/* When structure field packing is in effect, this variable is the
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number of bits to use as the maximum alignment. When packing is not
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in effect, this is zero. */
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extern int maximum_field_alignment;
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/* File used for outputting assembler code. */
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extern FILE *asm_out_file;
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/* Handle one token of a pragma directive. TOKEN is the
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current token, and STRING is its printable form. */
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void
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handle_pragma_token (string, token)
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char *string;
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tree token;
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{
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static enum pragma_state state = ps_start, type;
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static char *name;
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static char *value;
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static int align;
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if (string == 0)
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{
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if (type == ps_pack)
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{
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if (state == ps_right)
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maximum_field_alignment = align * 8;
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else
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warning ("malformed `#pragma pack'");
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}
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else if (type == ps_weak)
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{
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#ifdef HANDLE_PRAGMA_WEAK
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if (HANDLE_PRAGMA_WEAK)
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handle_pragma_weak (state, name, value);
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#endif /* HANDLE_PRAGMA_WEAK */
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}
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type = state = ps_start;
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return;
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}
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switch (state)
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{
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case ps_start:
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if (token && TREE_CODE (token) == IDENTIFIER_NODE)
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{
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if (strcmp (IDENTIFIER_POINTER (token), "pack") == 0)
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type = state = ps_pack;
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else if (strcmp (IDENTIFIER_POINTER (token), "weak") == 0)
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type = state = ps_weak;
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else
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{
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type = state = ps_done;
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/* Issue a warning message if we have been asked to do so.
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Ignoring unknown pragmas in system header file unless
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an explcit -Wunknown-pragmas has been given. */
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if (warn_unknown_pragmas > 1
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|| (warn_unknown_pragmas && ! in_system_header))
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warning ("ignoring pragma: %s", string);
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}
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}
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else
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type = state = ps_done;
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break;
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case ps_weak:
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if (token && TREE_CODE (token) == IDENTIFIER_NODE)
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{
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name = IDENTIFIER_POINTER (token);
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state = ps_name;
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}
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else
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state = ps_bad;
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break;
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case ps_name:
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state = (strcmp (string, "=") ? ps_bad : ps_equals);
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break;
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case ps_equals:
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if (token && TREE_CODE (token) == IDENTIFIER_NODE)
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{
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value = IDENTIFIER_POINTER (token);
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state = ps_value;
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}
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else
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state = ps_bad;
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break;
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case ps_value:
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state = ps_bad;
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break;
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case ps_pack:
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if (strcmp (string, "(") == 0)
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state = ps_left;
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else
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state = ps_bad;
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break;
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case ps_left:
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if (token && TREE_CODE (token) == INTEGER_CST
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&& TREE_INT_CST_HIGH (token) == 0)
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switch (TREE_INT_CST_LOW (token))
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{
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case 1:
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case 2:
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case 4:
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align = TREE_INT_CST_LOW (token);
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state = ps_align;
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break;
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default:
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state = ps_bad;
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}
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else if (! token && strcmp (string, ")") == 0)
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{
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align = 0;
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state = ps_right;
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}
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else
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state = ps_bad;
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break;
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case ps_align:
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if (strcmp (string, ")") == 0)
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state = ps_right;
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else
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state = ps_bad;
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break;
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case ps_right:
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state = ps_bad;
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break;
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case ps_bad:
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case ps_done:
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break;
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default:
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abort ();
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}
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}
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#endif /* HANDLE_SYSV_PRAGMA */
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