12 #define MAXDEFS (1 << 12)
13 #define MACROLEN (1 << 10)
14 #define MAXARGS (1 << 5)
19 char args
[MAXARGS
][NAMELEN
];
25 #define MAXBUFS (1 << 5)
40 static void buf_new(int type
, char *name
)
43 bufs
[nbufs
- 1].cur
= cur
;
44 bufs
[nbufs
- 1].len
= len
;
47 die("nomem: MAXBUFS reached!\n");
51 buf
= bufs
[nbufs
- 1].buf
;
52 bufs
[nbufs
- 1].type
= type
;
53 strcpy(bufs
[nbufs
-1].name
, name
? name
: "");
56 static void buf_pop(void)
60 cur
= bufs
[nbufs
- 1].cur
;
61 len
= bufs
[nbufs
- 1].len
;
62 buf
= bufs
[nbufs
- 1].buf
;
66 static int buf_iseval(void)
69 for (i
= 0; i
< nbufs
; i
++)
70 if (bufs
[i
].type
== BUF_EVAL
)
75 static int buf_expanding(char *macro
)
78 for (i
= 0; i
< nbufs
; i
++)
79 if (bufs
[i
].type
== BUF_MACRO
&& !strcmp(macro
, bufs
[i
].name
))
84 static int include_file(char *path
)
86 int fd
= open(path
, O_RDONLY
);
90 buf_new(BUF_FILE
, path
);
91 while ((n
= read(fd
, buf
+ len
, BUFSIZE
- len
)) > 0)
97 int cpp_init(char *path
)
99 cpp_define("__STDC__", "");
100 cpp_define("__x86_64__", "");
101 cpp_define("__linux__", "");
102 return include_file(path
);
105 static void jumpws(void)
107 while (cur
< len
&& isspace(buf
[cur
]))
111 static void read_word(char *dst
)
114 while (cur
< len
&& (isalnum(buf
[cur
]) || buf
[cur
] == '_'))
119 static void jumpcomment(void)
121 while (++cur
< len
) {
122 if (buf
[cur
] == '*' && buf
[cur
+ 1] == '/') {
129 static void read_tilleol(char *dst
)
131 while (cur
< len
&& isspace(buf
[cur
]) && buf
[cur
] != '\n')
133 while (cur
< len
&& buf
[cur
] != '\n') {
134 if (buf
[cur
] == '\\')
136 else if (buf
[cur
] == '/' && buf
[cur
+ 1] == '*')
144 static char *putstr(char *d
, char *s
)
152 #define MAXLOCS (1 << 10)
154 static char *locs
[MAXLOCS
] = {"/usr/include"};
155 static int nlocs
= 1;
157 void cpp_addpath(char *s
)
162 static int include_find(char *name
, int std
)
165 for (i
= std
? nlocs
- 1 : nlocs
; i
>= 0; i
--) {
170 s
= putstr(s
, locs
[i
]);
174 if (!include_file(path
))
180 static void jumpstr(void)
182 if (buf
[cur
] == '\'') {
183 while (cur
< len
&& buf
[++cur
] != '\'')
184 if (buf
[cur
] == '\\')
189 if (buf
[cur
] == '"') {
190 while (cur
< len
&& buf
[++cur
] != '"')
191 if (buf
[cur
] == '\\')
198 static void readarg(char *s
)
202 while (cur
< len
&& (depth
|| buf
[cur
] != ',' && buf
[cur
] != ')')) {
221 if (buf
[cur
] == '/' && buf
[cur
+ 1] == '*')
227 memcpy(s
, buf
+ beg
, cur
- beg
);
231 static int macro_find(char *name
)
234 for (i
= 0; i
< nmacros
; i
++)
235 if (!strcmp(name
, macros
[i
].name
))
240 static int macro_new(char *name
)
243 for (i
= 0; i
< nmacros
; i
++) {
244 if (!strcmp(name
, macros
[i
].name
))
246 if (!*macros
[i
].name
) {
247 strcpy(macros
[i
].name
, name
);
251 if (nmacros
>= MAXDEFS
)
252 die("nomem: MAXDEFS reached!\n");
253 strcpy(macros
[nmacros
++].name
, name
);
257 static void macro_define(void)
262 d
= ¯os
[macro_new(name
)];
264 if (buf
[cur
] == '(') {
267 while (cur
< len
&& buf
[cur
] != ')') {
268 readarg(d
->args
[d
->nargs
++]);
270 if (buf
[cur
++] != ',')
276 read_tilleol(d
->def
);
279 int cpp_read(char *buf
);
281 static char ebuf
[BUFSIZE
];
285 static long evalexpr(void);
287 static int cpp_eval(void)
291 char evalbuf
[BUFSIZE
];
292 read_tilleol(evalbuf
);
293 buf_new(BUF_EVAL
, NULL
);
294 strcpy(buf
, evalbuf
);
295 len
= strlen(evalbuf
);
299 while (bufid
< nbufs
|| cur
< len
)
300 elen
+= cpp_read(ebuf
+ elen
);
306 static void jumpifs(int jumpelse
)
310 if (buf
[cur
] == '#') {
314 if (!strcmp("else", cmd
))
315 if (!depth
&& !jumpelse
)
317 if (!strcmp("elif", cmd
))
318 if (!depth
&& !jumpelse
&& cpp_eval())
320 if (!strcmp("endif", cmd
)) {
326 if (!strcmp("ifdef", cmd
) || !strcmp("ifndef", cmd
) ||
331 if (buf
[cur
] == '/' && buf
[cur
+ 1] == '*') {
335 if (buf
[cur
] == '\'' || buf
[cur
] == '"') {
343 static void cpp_cmd(void)
348 if (!strcmp("define", cmd
)) {
352 if (!strcmp("undef", cmd
)) {
356 idx
= macro_find(name
);
358 strcpy(macros
[idx
].name
, "");
361 if (!strcmp("ifdef", cmd
) || !strcmp("ifndef", cmd
) ||
362 !strcmp("if", cmd
)) {
366 int not = cmd
[2] == 'n';
368 matched
= not ? macro_find(name
) < 0 :
369 macro_find(name
) >= 0;
371 matched
= cpp_eval();
377 if (!strcmp("else", cmd
) || !strcmp("elif", cmd
)) {
381 if (!strcmp("endif", cmd
))
383 if (!strcmp("include", cmd
)) {
388 e
= strchr(buf
+ cur
+ 1, buf
[cur
] == '"' ? '"' : '>');
389 memcpy(file
, s
, e
- s
);
392 if (include_find(file
, *e
== '>') == -1)
393 die("cannot include file\n");
398 static int macro_arg(struct macro
*m
, char *arg
)
401 for (i
= 0; i
< m
->nargs
; i
++)
402 if (!strcmp(arg
, m
->args
[i
]))
407 static void macro_expand(void)
410 char args
[MAXARGS
][MACROLEN
];
417 m
= ¯os
[macro_find(name
)];
419 buf_new(BUF_MACRO
, name
);
421 len
= strlen(m
->def
);
425 if (buf
[cur
] == '(') {
428 while (cur
< len
&& buf
[cur
] != ')') {
429 readarg(args
[nargs
++]);
439 buf_new(BUF_MACRO
, name
);
442 len
= strlen(m
->def
);
445 if (buf
[cur
] == '/' && buf
[cur
+ 1] == '*') {
449 if (strchr("'\"", buf
[cur
])) {
453 if (isalpha(buf
[cur
]) || buf
[cur
] == '_') {
457 if ((arg
= macro_arg(m
, word
)) != -1) {
458 int len
= cur
- beg
- strlen(word
);
459 char *argstr
= arg
> nargs
? "" : args
[arg
];
460 int arglen
= strlen(argstr
);
461 memcpy(dst
+ dstlen
, buf
+ beg
, len
);
463 memcpy(dst
+ dstlen
, argstr
, arglen
);
471 memcpy(dst
+ dstlen
, buf
+ beg
, len
- beg
);
479 void cpp_define(char *name
, char *def
)
482 buf_new(BUF_TEMP
, NULL
);
492 static int definedword
;
497 int cpp_read(char *s
)
510 if (buf
[cur
] == '#') {
517 if (buf
[cur
] == '/' && buf
[cur
+ 1] == '*') {
521 if (buf
[cur
] == '\'' || buf
[cur
] == '"') {
525 if (isalpha(buf
[cur
]) || buf
[cur
] == '_') {
528 if (!buf_expanding(word
) && macro_find(word
) != -1) {
533 if (buf_iseval() && !strcmp("defined", word
)) {
536 if (buf
[cur
] == '(') {
550 memcpy(s
, buf
+ old
, cur
- old
);
553 hunk_off
+= hunk_len
;
554 hunk_len
= cur
- old
;
559 /* preprocessor constant expression evaluation */
561 static char etok
[NAMELEN
];
564 static char *tok2
[] = {
565 "<<", ">>", "&&", "||", "==", "!=", "<=", ">="
568 static int eval_tok(void)
572 while (ecur
< elen
) {
573 while (ecur
< elen
&& isspace(ebuf
[ecur
]))
575 if (ebuf
[ecur
] == '/' && ebuf
[ecur
+ 1] == '*') {
576 while (ecur
< elen
&& (ebuf
[ecur
- 2] != '*' ||
577 ebuf
[ecur
- 1] != '/'))
585 if (isalpha(ebuf
[ecur
]) || ebuf
[ecur
] == '_') {
586 while (isalnum(ebuf
[ecur
]) || ebuf
[ecur
] == '_')
591 if (isdigit(ebuf
[ecur
])) {
592 while (isdigit(ebuf
[ecur
]))
594 while (tolower(ebuf
[ecur
]) == 'u' || tolower(ebuf
[ecur
]) == 'l')
598 for (i
= 0; i
< ARRAY_SIZE(tok2
); i
++)
599 if (TOK2(tok2
[i
]) == TOK2(ebuf
+ ecur
)) {
600 int ret
= TOK2(tok2
[i
]);
607 static int eval_see(void)
614 static int eval_get(void)
624 static long eval_num(void)
629 static int eval_jmp(int tok
)
631 if (eval_see() == tok
) {
638 static void eval_expect(int tok
)
643 static char *eval_id(void)
648 static long evalcexpr(void);
650 static long evalatom(void)
652 if (!eval_jmp(TOK_NUM
))
654 if (!eval_jmp(TOK_NAME
)) {
655 int parens
= !eval_jmp('(');
657 eval_expect(TOK_NAME
);
658 ret
= macro_find(eval_id()) >= 0;
663 if (!eval_jmp('(')) {
664 long ret
= evalcexpr();
671 static long evalpre(void)
682 static long evalmul(void)
684 long ret
= evalpre();
686 if (!eval_jmp('*')) {
690 if (!eval_jmp('/')) {
694 if (!eval_jmp('%')) {
703 static long evaladd(void)
705 long ret
= evalmul();
707 if (!eval_jmp('+')) {
711 if (!eval_jmp('-')) {
720 static long evalshift(void)
722 long ret
= evaladd();
724 if (!eval_jmp(TOK2("<<"))) {
728 if (!eval_jmp(TOK2(">>"))) {
737 static long evalcmp(void)
739 long ret
= evalshift();
741 if (!eval_jmp('<')) {
742 ret
= ret
< evalshift();
745 if (!eval_jmp('>')) {
746 ret
= ret
> evalshift();
749 if (!eval_jmp(TOK2("<="))) {
750 ret
= ret
<= evalshift();
753 if (!eval_jmp(TOK2(">="))) {
754 ret
= ret
>= evalshift();
762 static long evaleq(void)
764 long ret
= evalcmp();
766 if (!eval_jmp(TOK2("=="))) {
767 ret
= ret
== evalcmp();
770 if (!eval_jmp(TOK2("!="))) {
771 ret
= ret
!= evalcmp();
779 static long evalbitand(void)
782 while (!eval_jmp('&'))
787 static long evalxor(void)
789 long ret
= evalbitand();
790 while (!eval_jmp('^'))
795 static long evalbitor(void)
797 long ret
= evalxor();
798 while (!eval_jmp('|'))
803 static long evaland(void)
805 long ret
= evalbitor();
806 while (!eval_jmp(TOK2("&&")))
807 ret
= ret
&& evalbitor();
811 static long evalor(void)
813 long ret
= evaland();
814 while (!eval_jmp(TOK2("||")))
815 ret
= ret
|| evaland();
819 static long evalcexpr(void)
826 while (eval_get() != ':')
831 static long evalexpr(void)
837 static int numwidth(int n
)
847 static char *putnum(char *s
, int n
)
851 for (i
= 0; i
< w
; i
++) {
852 s
[w
- i
- 1] = !i
|| n
? '0' + n
% 10 : ' ';
858 static int buf_loc(char *s
, int off
)
862 while ((s
= strchr(s
, '\n')) && s
< e
) {
869 int cpp_loc(char *s
, long addr
)
874 for (i
= nbufs
- 1; i
> 0; i
--)
875 if (bufs
[i
].type
== BUF_FILE
)
877 if (addr
>= hunk_off
&& i
== nbufs
- 1)
878 line
= buf_loc(buf
, (cur
- hunk_len
) + (addr
- hunk_off
));
880 line
= buf_loc(bufs
[i
].buf
, bufs
[i
].cur
);
881 s
= putstr(s
, bufs
[i
].name
);