1 /* ----------------------------------------------------------------------- *
3 * Copyright 1996-2009 The NASM Authors - All Rights Reserved
4 * See the file AUTHORS included with the NASM distribution for
5 * the specific copyright holders.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * ----------------------------------------------------------------------- */
48 * Standard scanner routine used by parser.c and some output
49 * formats. It keeps a succession of temporary-storage strings in
50 * stdscan_tempstorage, which can be cleared using stdscan_reset.
52 static char *stdscan_bufptr
= NULL
;
53 static char **stdscan_tempstorage
= NULL
;
54 static int stdscan_tempsize
= 0, stdscan_templen
= 0;
55 #define STDSCAN_TEMP_DELTA 256
57 void stdscan_set(char *str
)
62 char *stdscan_get(void)
64 return stdscan_bufptr
;
67 static void stdscan_pop(void)
69 nasm_free(stdscan_tempstorage
[--stdscan_templen
]);
72 void stdscan_reset(void)
74 while (stdscan_templen
> 0)
79 * Unimportant cleanup is done to avoid confusing people who are trying
80 * to debug real memory leaks
82 void stdscan_cleanup(void)
85 nasm_free(stdscan_tempstorage
);
88 static char *stdscan_copy(char *p
, int len
)
92 text
= nasm_malloc(len
+ 1);
96 if (stdscan_templen
>= stdscan_tempsize
) {
97 stdscan_tempsize
+= STDSCAN_TEMP_DELTA
;
98 stdscan_tempstorage
= nasm_realloc(stdscan_tempstorage
,
102 stdscan_tempstorage
[stdscan_templen
++] = text
;
108 * a token is enclosed with braces. proper token type will be assigned
109 * accordingly with the token flag.
111 static int stdscan_handle_brace(struct tokenval
*tv
)
113 if (!(tv
->t_flag
& TFLAG_BRC_ANY
)) {
114 /* invalid token is put inside braces */
115 nasm_error(ERR_NONFATAL
,
116 "%s is not a valid decorator with braces", tv
->t_charptr
);
117 tv
->t_type
= TOKEN_INVALID
;
118 } else if (tv
->t_flag
& TFLAG_BRC_OPT
) {
119 if (is_reg_class(OPMASKREG
, tv
->t_integer
)) {
120 /* within braces, opmask register is now used as a mask */
121 tv
->t_type
= TOKEN_OPMASK
;
128 int stdscan(void *private_data
, struct tokenval
*tv
)
130 char ourcopy
[MAX_KEYWORD
+ 1], *r
, *s
;
132 (void)private_data
; /* Don't warn that this parameter is unused */
134 stdscan_bufptr
= nasm_skip_spaces(stdscan_bufptr
);
135 if (!*stdscan_bufptr
)
136 return tv
->t_type
= TOKEN_EOS
;
138 /* we have a token; either an id, a number or a char */
139 if (isidstart(*stdscan_bufptr
) ||
140 (*stdscan_bufptr
== '$' && isidstart(stdscan_bufptr
[1]))) {
141 /* now we've got an identifier */
145 if (*stdscan_bufptr
== '$') {
150 r
= stdscan_bufptr
++;
151 /* read the entire buffer to advance the buffer pointer but... */
152 while (isidchar(*stdscan_bufptr
))
155 /* ... copy only up to IDLEN_MAX-1 characters */
156 tv
->t_charptr
= stdscan_copy(r
, stdscan_bufptr
- r
< IDLEN_MAX
?
157 stdscan_bufptr
- r
: IDLEN_MAX
- 1);
159 if (is_sym
|| stdscan_bufptr
- r
> MAX_KEYWORD
)
160 return tv
->t_type
= TOKEN_ID
; /* bypass all other checks */
162 for (s
= tv
->t_charptr
, r
= ourcopy
; *s
; s
++)
163 *r
++ = nasm_tolower(*s
);
165 /* right, so we have an identifier sitting in temp storage. now,
166 * is it actually a register or instruction name, or what? */
167 token_type
= nasm_token_hash(ourcopy
, tv
);
169 if (likely(!(tv
->t_flag
& TFLAG_BRC
))) {
170 /* most of the tokens fall into this case */
173 return tv
->t_type
= TOKEN_ID
;
175 } else if (*stdscan_bufptr
== '$' && !isnumchar(stdscan_bufptr
[1])) {
177 * It's a $ sign with no following hex number; this must
178 * mean it's a Here token ($), evaluating to the current
179 * assembly location, or a Base token ($$), evaluating to
180 * the base of the current segment.
183 if (*stdscan_bufptr
== '$') {
185 return tv
->t_type
= TOKEN_BASE
;
187 return tv
->t_type
= TOKEN_HERE
;
188 } else if (isnumstart(*stdscan_bufptr
)) { /* now we've got a number */
191 bool is_float
= false;
197 if (*stdscan_bufptr
== '$') {
203 c
= *stdscan_bufptr
++;
205 if (!is_hex
&& (c
== 'e' || c
== 'E')) {
207 if (*stdscan_bufptr
== '+' || *stdscan_bufptr
== '-') {
209 * e can only be followed by +/- if it is either a
210 * prefixed hex number or a floating-point number
215 } else if (c
== 'H' || c
== 'h' || c
== 'X' || c
== 'x') {
217 } else if (c
== 'P' || c
== 'p') {
219 if (*stdscan_bufptr
== '+' || *stdscan_bufptr
== '-')
221 } else if (isnumchar(c
) || c
== '_')
228 stdscan_bufptr
--; /* Point to first character beyond number */
230 if (has_e
&& !is_hex
) {
231 /* 1e13 is floating-point, but 1e13h is not */
236 tv
->t_charptr
= stdscan_copy(r
, stdscan_bufptr
- r
);
237 return tv
->t_type
= TOKEN_FLOAT
;
239 r
= stdscan_copy(r
, stdscan_bufptr
- r
);
240 tv
->t_integer
= readnum(r
, &rn_error
);
243 /* some malformation occurred */
244 return tv
->t_type
= TOKEN_ERRNUM
;
246 tv
->t_charptr
= NULL
;
247 return tv
->t_type
= TOKEN_NUM
;
249 } else if (*stdscan_bufptr
== '\'' || *stdscan_bufptr
== '"' ||
250 *stdscan_bufptr
== '`') {
251 /* a quoted string */
252 char start_quote
= *stdscan_bufptr
;
253 tv
->t_charptr
= stdscan_bufptr
;
254 tv
->t_inttwo
= nasm_unquote(tv
->t_charptr
, &stdscan_bufptr
);
255 if (*stdscan_bufptr
!= start_quote
)
256 return tv
->t_type
= TOKEN_ERRSTR
;
257 stdscan_bufptr
++; /* Skip final quote */
258 return tv
->t_type
= TOKEN_STR
;
259 } else if (*stdscan_bufptr
== '{') {
260 /* now we've got a decorator */
263 stdscan_bufptr
= nasm_skip_spaces(stdscan_bufptr
);
265 r
= ++stdscan_bufptr
;
267 * read the entire buffer to advance the buffer pointer
268 * {rn-sae}, {rd-sae}, {ru-sae}, {rz-sae} contain '-' in tokens.
270 while (isbrcchar(*stdscan_bufptr
))
273 token_len
= stdscan_bufptr
- r
;
275 /* ... copy only up to DECOLEN_MAX-1 characters */
276 tv
->t_charptr
= stdscan_copy(r
, token_len
< DECOLEN_MAX
?
277 token_len
: DECOLEN_MAX
- 1);
279 stdscan_bufptr
= nasm_skip_spaces(stdscan_bufptr
);
280 /* if brace is not closed properly or token is too long */
281 if ((*stdscan_bufptr
!= '}') || (token_len
> MAX_KEYWORD
)) {
282 nasm_error(ERR_NONFATAL
,
283 "invalid decorator token inside braces");
284 return tv
->t_type
= TOKEN_INVALID
;
287 stdscan_bufptr
++; /* skip closing brace */
289 for (s
= tv
->t_charptr
, r
= ourcopy
; *s
; s
++)
290 *r
++ = nasm_tolower(*s
);
293 /* right, so we have a decorator sitting in temp storage. */
294 nasm_token_hash(ourcopy
, tv
);
296 /* handle tokens inside braces */
297 return stdscan_handle_brace(tv
);
298 } else if (*stdscan_bufptr
== ';') {
299 /* a comment has happened - stay */
300 return tv
->t_type
= TOKEN_EOS
;
301 } else if (stdscan_bufptr
[0] == '>' && stdscan_bufptr
[1] == '>') {
303 return tv
->t_type
= TOKEN_SHR
;
304 } else if (stdscan_bufptr
[0] == '<' && stdscan_bufptr
[1] == '<') {
306 return tv
->t_type
= TOKEN_SHL
;
307 } else if (stdscan_bufptr
[0] == '/' && stdscan_bufptr
[1] == '/') {
309 return tv
->t_type
= TOKEN_SDIV
;
310 } else if (stdscan_bufptr
[0] == '%' && stdscan_bufptr
[1] == '%') {
312 return tv
->t_type
= TOKEN_SMOD
;
313 } else if (stdscan_bufptr
[0] == '=' && stdscan_bufptr
[1] == '=') {
315 return tv
->t_type
= TOKEN_EQ
;
316 } else if (stdscan_bufptr
[0] == '<' && stdscan_bufptr
[1] == '>') {
318 return tv
->t_type
= TOKEN_NE
;
319 } else if (stdscan_bufptr
[0] == '!' && stdscan_bufptr
[1] == '=') {
321 return tv
->t_type
= TOKEN_NE
;
322 } else if (stdscan_bufptr
[0] == '<' && stdscan_bufptr
[1] == '=') {
324 return tv
->t_type
= TOKEN_LE
;
325 } else if (stdscan_bufptr
[0] == '>' && stdscan_bufptr
[1] == '=') {
327 return tv
->t_type
= TOKEN_GE
;
328 } else if (stdscan_bufptr
[0] == '&' && stdscan_bufptr
[1] == '&') {
330 return tv
->t_type
= TOKEN_DBL_AND
;
331 } else if (stdscan_bufptr
[0] == '^' && stdscan_bufptr
[1] == '^') {
333 return tv
->t_type
= TOKEN_DBL_XOR
;
334 } else if (stdscan_bufptr
[0] == '|' && stdscan_bufptr
[1] == '|') {
336 return tv
->t_type
= TOKEN_DBL_OR
;
337 } else /* just an ordinary char */
338 return tv
->t_type
= (uint8_t)(*stdscan_bufptr
++);