/*      $OpenBSD: gcc_compat.c,v 1.6 2008/08/17 18:40:12 ragge Exp $     */
/*
 * Copyright (c) 2004 Anders Magnusson (ragge@ludd.luth.se).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Routines to support some of the gcc extensions to C.
 */
#ifdef GCC_COMPAT

#include "pass1.h"
#include "cgram.h"

#include <string.h>

static struct kw {
	char *name, *ptr;
	int rv;
} kw[] = {
/*
 * Do NOT change the order of these entries unless you know 
 * what you're doing!
 */
/* 0 */	{ "__asm", NULL, C_ASM },
/* 1 */	{ "__signed", NULL, 0 },
/* 2 */	{ "__inline", NULL, C_FUNSPEC },
/* 3 */	{ "__const", NULL, 0 },
/* 4 */	{ "__asm__", NULL, C_ASM },
/* 5 */	{ "__inline__", NULL, C_FUNSPEC },
/* 6 */	{ "__thread", NULL, 0 },
/* 7 */	{ "__FUNCTION__", NULL, 0 },
/* 8 */	{ "__volatile", NULL, 0 },
/* 9 */	{ "__volatile__", NULL, 0 },
/* 10 */{ "__restrict", NULL, -1 },
	{ NULL, NULL, 0 },
};

void
gcc_init()
{
	struct kw *kwp;

	for (kwp = kw; kwp->name; kwp++)
		kwp->ptr = addname(kwp->name);

}

#define	TS	"\n#pragma tls\n# %d\n"
#define	TLLEN	sizeof(TS)+10
/*
 * See if a string matches a gcc keyword.
 */
int
gcc_keyword(char *str, NODE **n)
{
	char tlbuf[TLLEN], *tw;
	struct kw *kwp;
	int i;

	for (i = 0, kwp = kw; kwp->name; kwp++, i++)
		if (str == kwp->ptr)
			break;
	if (kwp->name == NULL)
		return 0;
	if (kwp->rv)
		return kwp->rv;
	switch (i) {
	case 1: /* __signed */
		*n = mkty((TWORD)SIGNED, 0, MKSUE(SIGNED));
		return C_TYPE;
	case 3: /* __const */
		*n = block(QUALIFIER, NIL, NIL, CON, 0, 0);
		return C_QUALIFIER;
	case 6: /* __thread */
		snprintf(tlbuf, TLLEN, TS, lineno);
		tw = &tlbuf[strlen(tlbuf)];
		while (tw > tlbuf)
			cunput(*--tw);
		return -1;
	case 7: /* __FUNCTION__ */
		if (cftnsp == NULL) {
			uerror("__FUNCTION__ outside function");
			yylval.strp = "";
		} else
			yylval.strp = cftnsp->sname; /* XXX - not C99 */
		return C_STRING;
	case 8: /* __volatile */
	case 9: /* __volatile__ */
		*n = block(QUALIFIER, NIL, NIL, VOL, 0, 0);
		return C_QUALIFIER;
	}
	cerror("gcc_keyword");
	return 0;
}
#endif