[apple/xnu.git] / osfmk / ddb / db_expr.c

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */
/*
 *	Author: David B. Golub, Carnegie Mellon University
 *	Date:	7/90
 */

#include <mach/boolean.h>
#include <machine/db_machdep.h>
#include <ddb/db_access.h>
#include <ddb/db_command.h>
#include <ddb/db_expr.h>
#include <ddb/db_lex.h>
#include <ddb/db_output.h>		/* For db_printf() */
#include <ddb/db_sym.h>
#include <ddb/db_variables.h>
#include <kern/task.h>


/* Prototypes for functions local to this file.  XXX -- should be static!
 */
boolean_t db_term(db_expr_t *valuep);
boolean_t db_unary(db_expr_t *valuep);
boolean_t db_mult_expr(db_expr_t *valuep);
boolean_t db_add_expr(db_expr_t *valuep);
boolean_t db_shift_expr(db_expr_t *valuep);
boolean_t db_logical_relation_expr(db_expr_t *valuep);
boolean_t db_logical_and_expr(db_expr_t *valuep);
boolean_t db_logical_or_expr(db_expr_t *valuep);


/* try to interpret unknown symbols as hexadecimal constants */
int db_allow_unprefixed_hexa = 1;

boolean_t
db_term(db_expr_t *valuep)
{
	int	t;
	boolean_t valid_symbol = FALSE;
	boolean_t valid_hexa = FALSE;

	switch(t = db_read_token()) {
	case tIDENT:
	    if (db_value_of_name(db_tok_string, valuep)) {
		valid_symbol = TRUE;
	    }
	    if (db_allow_unprefixed_hexa && db_radix == 16 &&
		db_tok_string) {
		char *cp;
		db_expr_t value;
		    
		value = 0;
		valid_hexa = TRUE;
		for (cp = db_tok_string; *cp; cp++) {
		    if (*cp >= 'a' && *cp <= 'f') {
			value = value * 16 + 10 + (*cp - 'a');
		    } else if (*cp >= 'A' && *cp <= 'F') {
			value = value * 16 + 10 + (*cp - 'A');
		    } else if (*cp >= '0' && *cp <= '9') {
			value = value * 16 + (*cp - '0');
		    } else {
			valid_hexa = FALSE;
			break;
		    }
		}
		if (valid_hexa) {
		    if (valid_symbol) {
			db_printf("Ambiguous constant %x used as a symbol\n",
				  value);
		    } else {
			*valuep = value;
		    }	
		}
	    }
	    if (!valid_symbol && !valid_hexa) {
		db_printf("Symbol \"%s\" not found\n", db_tok_string);
		db_error(0);
		/*NOTREACHED*/
	    }
	    return (TRUE);
	case tNUMBER:
	    *valuep = /*(db_expr_t)*/db_tok_number;
	    return (TRUE);
	case tDOT:
	    *valuep = (db_expr_t)db_dot;
	    return (TRUE);
	case tDOTDOT:
	    *valuep = (db_expr_t)db_prev;
	    return (TRUE);
	case tPLUS:
	    *valuep = (db_expr_t) db_next;
	    return (TRUE);
	case tQUOTE:
	    *valuep = (db_expr_t)db_last_addr;
	    return (TRUE);
	case tDOLLAR:
	    if (!db_get_variable(valuep))
		return (FALSE);
	    return (TRUE);
	case tLPAREN:
	    if (!db_expression(valuep)) {
		db_error("Unmached ()s\n");
		/*NOTREACHED*/
	    }
	    t = db_read_token();
	    if (t != tRPAREN) {
		db_printf("')' expected at \"%s...\"\n", db_tok_string);
		db_error(0);
		/*NOTREACHED*/
	    }
	    return (TRUE);
	case tSTRING:
	    {
		    static db_tok_offset = 0;
		    char *sp, *cp;

		    sp = (char *)db_tok_string + db_tok_offset;
		    *valuep = *(int *)sp;
		    for (cp = sp;
			 *cp && cp < sp + sizeof (int);
			 cp++);
		    if (cp == sp + sizeof (int) && *cp) {
			    db_tok_offset += sizeof (int);
			    db_unread_token(t);
		    } else {
			    db_tok_offset = 0;
		    }
		    return (TRUE);
	    }
	default:
	    db_unread_token(t);
	    return (FALSE);
	}
}

int
db_size_option(
	char		*modif,
	boolean_t	*u_option,
	boolean_t	*t_option)
{
	register  char *p;
	int	  size = sizeof(int);

	*u_option = FALSE;
	*t_option = FALSE;
	for (p = modif; *p; p++) {
	    switch(*p) {
	    case 'b':
		size = sizeof(char);
		break;
	    case 'h':
		size = sizeof(short);
		break;
	    case 'l':
		size = sizeof(long);
		break;
	    case 'u':
		*u_option = TRUE;
		break;
	    case 't':
		*t_option = TRUE;
		break;
	    }
	}
	return(size);
}

boolean_t
db_unary(db_expr_t *valuep)
{
	int	  t;
	int	  size;
	boolean_t u_opt, t_opt;
	task_t	  task;
	extern	  task_t db_default_task;

	t = db_read_token();
	if (t == tMINUS) {
	    if (!db_unary(valuep)) {
		db_error("Expression syntax error after '-'\n");
		/*NOTREACHED*/
	    }
	    *valuep = -*valuep;
	    return (TRUE);
	}
	if (t == tSTAR) {
	    /* indirection */
	    if (!db_unary(valuep)) {
		db_error("Expression syntax error after '*'\n");
		/*NOTREACHED*/
	    }
	    task = TASK_NULL;
	    size = sizeof(db_addr_t);
	    u_opt = FALSE;
	    t = db_read_token();
	    if (t == tIDENT && db_tok_string[0] == ':') {
		size = db_size_option(&db_tok_string[1], &u_opt, &t_opt);
		if (t_opt)
		    task = db_default_task;
	    } else
		db_unread_token(t);
	    *valuep = db_get_task_value((db_addr_t)*valuep, size, !u_opt, task);
	    return (TRUE);
	}
	if (t == tEXCL) {
	    if (!db_unary(valuep)) {
		db_error("Expression syntax error after '!'\n");
		/*NOTREACHED*/
	    }
	    *valuep = (!(*valuep));
	    return (TRUE);
	}
	db_unread_token(t);
	return (db_term(valuep));
}

boolean_t
db_mult_expr(db_expr_t *valuep)
{
	db_expr_t	lhs, rhs;
	int		t;
	char		c;

	if (!db_unary(&lhs))
	    return (FALSE);

	t = db_read_token();
	while (t == tSTAR || t == tSLASH || t == tPCT || t == tHASH
		|| t == tBIT_AND) {
	    c = db_tok_string[0];
	    if (!db_term(&rhs)) {
		db_printf("Expression syntax error after '%c'\n", c);
		db_error(0);
		/*NOTREACHED*/
	    }
	    switch(t) {
	    case tSTAR:
		lhs *= rhs;
		break;
	    case tBIT_AND:
		lhs &= rhs;
		break;
	    default:
		if (rhs == 0) {
		    db_error("Divide by 0\n");
		    /*NOTREACHED*/
		}
		if (t == tSLASH)
		    lhs /= rhs;
		else if (t == tPCT)
		    lhs %= rhs;
		else
		    lhs = ((lhs+rhs-1)/rhs)*rhs;
	    }
	    t = db_read_token();
	}
	db_unread_token(t);
	*valuep = lhs;
	return (TRUE);
}

boolean_t
db_add_expr(db_expr_t *valuep)
{
	db_expr_t	lhs, rhs;
	int		t;
	char		c;

	if (!db_mult_expr(&lhs))
	    return (FALSE);

	t = db_read_token();
	while (t == tPLUS || t == tMINUS || t == tBIT_OR) {
	    c = db_tok_string[0];
	    if (!db_mult_expr(&rhs)) {
		db_printf("Expression syntax error after '%c'\n", c);
		db_error(0);
		/*NOTREACHED*/
	    }
	    if (t == tPLUS)
		lhs += rhs;
	    else if (t == tMINUS)
		lhs -= rhs;
	    else
		lhs |= rhs;
	    t = db_read_token();
	}
	db_unread_token(t);
	*valuep = lhs;
	return (TRUE);
}

boolean_t
db_shift_expr(db_expr_t *valuep)
{
	db_expr_t	lhs, rhs;
	int		t;

	if (!db_add_expr(&lhs))
	    return (FALSE);

	t = db_read_token();
	while (t == tSHIFT_L || t == tSHIFT_R) {
	    if (!db_add_expr(&rhs)) {
		db_printf("Expression syntax error after \"%s\"\n",
			(t == tSHIFT_L)? "<<": ">>");
		db_error(0);
		/*NOTREACHED*/
	    }
	    if (rhs < 0) {
		db_error("Negative shift amount\n");
		/*NOTREACHED*/
	    }
	    if (t == tSHIFT_L)
		lhs <<= rhs;
	    else {
		/* Shift right is unsigned */
		lhs = (uint64_t) lhs >> rhs;
	    }
	    t = db_read_token();
	}
	db_unread_token(t);
	*valuep = lhs;
	return (TRUE);
}

boolean_t
db_logical_relation_expr(db_expr_t *valuep)
{
	db_expr_t	lhs, rhs;
	int		t;
	char		op[3];

	if (!db_shift_expr(&lhs))
	    return(FALSE);

	t = db_read_token();
	while (t == tLOG_EQ || t == tLOG_NOT_EQ
		|| t == tGREATER || t == tGREATER_EQ
		|| t == tLESS || t == tLESS_EQ) {
	    op[0] = db_tok_string[0];
	    op[1] = db_tok_string[1];
	    op[2] = 0;
	    if (!db_shift_expr(&rhs)) {
		db_printf("Expression syntax error after \"%s\"\n", op);
		db_error(0);
		/*NOTREACHED*/
	    }
	    switch(t) {
	    case tLOG_EQ:
		lhs = (lhs == rhs);
		break;
	    case tLOG_NOT_EQ:
		lhs = (lhs != rhs);
		break;
	    case tGREATER:
		lhs = (lhs > rhs);
		break;
	    case tGREATER_EQ:
		lhs = (lhs >= rhs);
		break;
	    case tLESS:
		lhs = (lhs < rhs);
		break;
	    case tLESS_EQ:
		lhs = (lhs <= rhs);
		break;
	    }
	    t = db_read_token();
	}
	db_unread_token(t);
	*valuep = lhs;
	return (TRUE);
}

boolean_t
db_logical_and_expr(db_expr_t *valuep)
{
	db_expr_t	lhs, rhs;
	int		t;

	if (!db_logical_relation_expr(&lhs))
	    return(FALSE);

	t = db_read_token();
	while (t == tLOG_AND) {
	    if (!db_logical_relation_expr(&rhs)) {
		db_error("Expression syntax error after \"&&\"\n");
		/*NOTREACHED*/
	    }
	    lhs = (lhs && rhs);
	    t = db_read_token();
	}
	db_unread_token(t);
	*valuep = lhs;
	return (TRUE);
}

boolean_t
db_logical_or_expr(db_expr_t *valuep)
{
	db_expr_t	lhs, rhs;
	int		t;

	if (!db_logical_and_expr(&lhs))
	    return(FALSE);

	t = db_read_token();
	while (t == tLOG_OR) {
	    if (!db_logical_and_expr(&rhs)) {
		db_error("Expression syntax error after \"||\"\n");
		/*NOTREACHED*/
	    }
	    lhs = (lhs || rhs);
	    t = db_read_token();
	}
	db_unread_token(t);
	*valuep = lhs;
	return (TRUE);
}

int
db_expression(db_expr_t *valuep)
{
	return (db_logical_or_expr(valuep));
}
Commit	Line	Data
1c79356b	1	/*
91447636	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
1c79356b	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
1c79356b A	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
	56	/*
	57	*/
	58	/*
	59	* Author: David B. Golub, Carnegie Mellon University
	60	* Date: 7/90
	61	*/
	62
	63	#include <mach/boolean.h>
	64	#include <machine/db_machdep.h>
	65	#include <ddb/db_access.h>
	66	#include <ddb/db_command.h>
	67	#include <ddb/db_expr.h>
	68	#include <ddb/db_lex.h>
	69	#include <ddb/db_output.h> /* For db_printf() */
	70	#include <ddb/db_sym.h>
	71	#include <ddb/db_variables.h>
	72	#include <kern/task.h>
	73
	74
	75
	76	/* Prototypes for functions local to this file. XXX -- should be static!
	77	*/
	78	boolean_t db_term(db_expr_t *valuep);
	79	boolean_t db_unary(db_expr_t *valuep);
	80	boolean_t db_mult_expr(db_expr_t *valuep);
	81	boolean_t db_add_expr(db_expr_t *valuep);
	82	boolean_t db_shift_expr(db_expr_t *valuep);
	83	boolean_t db_logical_relation_expr(db_expr_t *valuep);
	84	boolean_t db_logical_and_expr(db_expr_t *valuep);
	85	boolean_t db_logical_or_expr(db_expr_t *valuep);
	86
	87
	88	/* try to interpret unknown symbols as hexadecimal constants */
	89	int db_allow_unprefixed_hexa = 1;
	90
	91	boolean_t
	92	db_term(db_expr_t *valuep)
	93	{
	94	int t;
95	boolean_t valid_symbol = FALSE;
96	boolean_t valid_hexa = FALSE;
97
98	switch(t = db_read_token()) {
99	case tIDENT:
100	if (db_value_of_name(db_tok_string, valuep)) {
101	valid_symbol = TRUE;
102	}
103	if (db_allow_unprefixed_hexa && db_radix == 16 &&
104	db_tok_string) {
105	char *cp;
91447636	106	db_expr_t value;
1c79356b A	107
	108	value = 0;
	109	valid_hexa = TRUE;
	110	for (cp = db_tok_string; *cp; cp++) {
	111	if (cp >= 'a' && cp <= 'f') {
	112	value = value * 16 + 10 + (*cp - 'a');
	113	} else if (cp >= 'A' && cp <= 'F') {
	114	value = value * 16 + 10 + (*cp - 'A');
	115	} else if (cp >= '0' && cp <= '9') {
	116	value = value * 16 + (*cp - '0');
	117	} else {
	118	valid_hexa = FALSE;
	119	break;
	120	}
	121	}
	122	if (valid_hexa) {
	123	if (valid_symbol) {
	124	db_printf("Ambiguous constant %x used as a symbol\n",
	125	value);
	126	} else {
91447636	127	*valuep = value;
1c79356b A	128	}
	129	}
	130	}
	131	if (!valid_symbol && !valid_hexa) {
	132	db_printf("Symbol \"%s\" not found\n", db_tok_string);
	133	db_error(0);
	134	/NOTREACHED/
	135	}
	136	return (TRUE);
	137	case tNUMBER:
	138	valuep = /(db_expr_t)*/db_tok_number;
	139	return (TRUE);
	140	case tDOT:
	141	*valuep = (db_expr_t)db_dot;
	142	return (TRUE);
	143	case tDOTDOT:
	144	*valuep = (db_expr_t)db_prev;
	145	return (TRUE);
	146	case tPLUS:
	147	*valuep = (db_expr_t) db_next;
	148	return (TRUE);
	149	case tQUOTE:
	150	*valuep = (db_expr_t)db_last_addr;
	151	return (TRUE);
	152	case tDOLLAR:
	153	if (!db_get_variable(valuep))
	154	return (FALSE);
	155	return (TRUE);
	156	case tLPAREN:
	157	if (!db_expression(valuep)) {
	158	db_error("Unmached ()s\n");
	159	/NOTREACHED/
	160	}
	161	t = db_read_token();
	162	if (t != tRPAREN) {
	163	db_printf("')' expected at \"%s...\"\n", db_tok_string);
	164	db_error(0);
	165	/NOTREACHED/
	166	}
	167	return (TRUE);
	168	case tSTRING:
	169	{
	170	static db_tok_offset = 0;
	171	char sp, cp;
	172
	173	sp = (char *)db_tok_string + db_tok_offset;
	174	valuep = (int *)sp;
	175	for (cp = sp;
	176	*cp && cp < sp + sizeof (int);
	177	cp++);
	178	if (cp == sp + sizeof (int) && *cp) {
	179	db_tok_offset += sizeof (int);
	180	db_unread_token(t);
	181	} else {
	182	db_tok_offset = 0;
	183	}
	184	return (TRUE);
	185	}
	186	default:
	187	db_unread_token(t);
	188	return (FALSE);
	189	}
	190	}
	191
192	int
193	db_size_option(
194	char *modif,
195	boolean_t *u_option,
196	boolean_t *t_option)
197	{
198	register char *p;
199	int size = sizeof(int);
200
201	*u_option = FALSE;
202	*t_option = FALSE;
203	for (p = modif; *p; p++) {
204	switch(*p) {
205	case 'b':
206	size = sizeof(char);
207	break;
208	case 'h':
209	size = sizeof(short);
210	break;
211	case 'l':
212	size = sizeof(long);
213	break;
214	case 'u':
215	*u_option = TRUE;
216	break;
217	case 't':
218	*t_option = TRUE;
219	break;
220	}
221	}
222	return(size);
223	}
224
225	boolean_t
226	db_unary(db_expr_t *valuep)
227	{
228	int t;
229	int size;
230	boolean_t u_opt, t_opt;
231	task_t task;
232	extern task_t db_default_task;
233
234	t = db_read_token();
235	if (t == tMINUS) {
236	if (!db_unary(valuep)) {
237	db_error("Expression syntax error after '-'\n");
238	/NOTREACHED/
239	}
240	valuep = -valuep;
241	return (TRUE);
242	}
243	if (t == tSTAR) {
244	/* indirection */
245	if (!db_unary(valuep)) {
246	db_error("Expression syntax error after '*'\n");
247	/NOTREACHED/
248	}
249	task = TASK_NULL;
250	size = sizeof(db_addr_t);
251	u_opt = FALSE;
252	t = db_read_token();
253	if (t == tIDENT && db_tok_string[0] == ':') {
254	size = db_size_option(&db_tok_string[1], &u_opt, &t_opt);
255	if (t_opt)
256	task = db_default_task;
257	} else
258	db_unread_token(t);
259	valuep = db_get_task_value((db_addr_t)valuep, size, !u_opt, task);
260	return (TRUE);
261	}
262	if (t == tEXCL) {
263	if (!db_unary(valuep)) {
264	db_error("Expression syntax error after '!'\n");
265	/NOTREACHED/
266	}
267	valuep = (!(valuep));
268	return (TRUE);
269	}
270	db_unread_token(t);
271	return (db_term(valuep));
272	}
273
274	boolean_t
275	db_mult_expr(db_expr_t *valuep)
276	{
277	db_expr_t lhs, rhs;
278	int t;
279	char c;
280
281	if (!db_unary(&lhs))
282	return (FALSE);
283
284	t = db_read_token();
285	while (t == tSTAR \|\| t == tSLASH \|\| t == tPCT \|\| t == tHASH
286	\|\| t == tBIT_AND) {
287	c = db_tok_string[0];
288	if (!db_term(&rhs)) {
289	db_printf("Expression syntax error after '%c'\n", c);
290	db_error(0);
291	/NOTREACHED/
292	}
293	switch(t) {
294	case tSTAR:
295	lhs *= rhs;
296	break;
297	case tBIT_AND:
298	lhs &= rhs;
299	break;
300	default:
301	if (rhs == 0) {
302	db_error("Divide by 0\n");
303	/NOTREACHED/
304	}
305	if (t == tSLASH)
306	lhs /= rhs;
307	else if (t == tPCT)
308	lhs %= rhs;
309	else
310	lhs = ((lhs+rhs-1)/rhs)*rhs;
311	}
312	t = db_read_token();
313	}
314	db_unread_token(t);
315	*valuep = lhs;
316	return (TRUE);
317	}
318
319	boolean_t
320	db_add_expr(db_expr_t *valuep)
321	{
322	db_expr_t lhs, rhs;
323	int t;
324	char c;
325
326	if (!db_mult_expr(&lhs))
327	return (FALSE);
328
329	t = db_read_token();
330	while (t == tPLUS \|\| t == tMINUS \|\| t == tBIT_OR) {
331	c = db_tok_string[0];
332	if (!db_mult_expr(&rhs)) {
333	db_printf("Expression syntax error after '%c'\n", c);
334	db_error(0);
335	/NOTREACHED/
336	}
337	if (t == tPLUS)
338	lhs += rhs;
339	else if (t == tMINUS)
340	lhs -= rhs;
341	else
342	lhs \|= rhs;
343	t = db_read_token();
344	}
345	db_unread_token(t);
346	*valuep = lhs;
347	return (TRUE);
348	}
349
350	boolean_t
351	db_shift_expr(db_expr_t *valuep)
352	{
353	db_expr_t lhs, rhs;
354	int t;
355
356	if (!db_add_expr(&lhs))
357	return (FALSE);
358
359	t = db_read_token();
360	while (t == tSHIFT_L \|\| t == tSHIFT_R) {
361	if (!db_add_expr(&rhs)) {
362	db_printf("Expression syntax error after \"%s\"\n",
363	(t == tSHIFT_L)? "<<": ">>");
364	db_error(0);
365	/NOTREACHED/
366	}
367	if (rhs < 0) {
368	db_error("Negative shift amount\n");
369	/NOTREACHED/
370	}
371	if (t == tSHIFT_L)
372	lhs <<= rhs;
373	else {
374	/* Shift right is unsigned */
55e303ae	375	lhs = (uint64_t) lhs >> rhs;
1c79356b A	376	}
	377	t = db_read_token();
	378	}
	379	db_unread_token(t);
	380	*valuep = lhs;
	381	return (TRUE);
	382	}
	383
	384	boolean_t
	385	db_logical_relation_expr(db_expr_t *valuep)
	386	{
	387	db_expr_t lhs, rhs;
	388	int t;
	389	char op[3];
	390
	391	if (!db_shift_expr(&lhs))
	392	return(FALSE);
	393
	394	t = db_read_token();
	395	while (t == tLOG_EQ \|\| t == tLOG_NOT_EQ
	396	\|\| t == tGREATER \|\| t == tGREATER_EQ
	397	\|\| t == tLESS \|\| t == tLESS_EQ) {
	398	op[0] = db_tok_string[0];
	399	op[1] = db_tok_string[1];
	400	op[2] = 0;
	401	if (!db_shift_expr(&rhs)) {
	402	db_printf("Expression syntax error after \"%s\"\n", op);
	403	db_error(0);
	404	/NOTREACHED/
	405	}
	406	switch(t) {
	407	case tLOG_EQ:
	408	lhs = (lhs == rhs);
	409	break;
	410	case tLOG_NOT_EQ:
	411	lhs = (lhs != rhs);
	412	break;
	413	case tGREATER:
	414	lhs = (lhs > rhs);
	415	break;
	416	case tGREATER_EQ:
	417	lhs = (lhs >= rhs);
	418	break;
	419	case tLESS:
	420	lhs = (lhs < rhs);
	421	break;
	422	case tLESS_EQ:
	423	lhs = (lhs <= rhs);
	424	break;
	425	}
	426	t = db_read_token();
	427	}
	428	db_unread_token(t);
	429	*valuep = lhs;
	430	return (TRUE);
	431	}
	432
	433	boolean_t
	434	db_logical_and_expr(db_expr_t *valuep)
	435	{
	436	db_expr_t lhs, rhs;
	437	int t;
	438
	439	if (!db_logical_relation_expr(&lhs))
440	return(FALSE);
441
442	t = db_read_token();
443	while (t == tLOG_AND) {
444	if (!db_logical_relation_expr(&rhs)) {
445	db_error("Expression syntax error after \"&&\"\n");
446	/NOTREACHED/
447	}
448	lhs = (lhs && rhs);
449	t = db_read_token();
450	}
451	db_unread_token(t);
452	*valuep = lhs;
453	return (TRUE);
454	}
455
456	boolean_t
457	db_logical_or_expr(db_expr_t *valuep)
458	{
459	db_expr_t lhs, rhs;
460	int t;
461
462	if (!db_logical_and_expr(&lhs))
463	return(FALSE);
464
465	t = db_read_token();
466	while (t == tLOG_OR) {
467	if (!db_logical_and_expr(&rhs)) {
468	db_error("Expression syntax error after \"\|\|\"\n");
469	/NOTREACHED/
470	}
471	lhs = (lhs \|\| rhs);
472	t = db_read_token();
473	}
474	db_unread_token(t);
475	*valuep = lhs;
476	return (TRUE);
477	}
478
479	int
480	db_expression(db_expr_t *valuep)
481	{
482	return (db_logical_or_expr(valuep));
483	}