speed up +10%, update (c), make CONFIG_FEATURE_MOD2_4 as config/feature/mod_2_4

git-svn-id: svn://busybox.net/trunk/busybox@11483 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 30 insertions, 26 deletions

diff --git a/scripts/bb_mkdep.c b/scripts/bb_mkdep.c
index b2e0995ce..4af42b876 100644
--- a/scripts/bb_mkdep.c
+++ b/scripts/bb_mkdep.c
@@ -1,7 +1,13 @@
 /*
- * Another fast dependencies generator for Makefiles, Version 2.0
+ * Another fast dependencies generator for Makefiles, Version 2.1
  *
  * Copyright (C) 2005 by Vladimir Oleynik <dzo@simtreas.ru>
+ * mmaping file may be originally by Linus Torvalds.
+ *
+ * (c) 2005 Bernhard Fischer:
+ *  - commentary typos,
+ *  - move "memory exhausted" into msg_enomem,
+ *  - more verbose --help output.
  *
  * This program does:
  * 1) find #define KEY VALUE or #undef KEY from include/config.h
@@ -11,7 +17,7 @@
  * 5) generate dependencies to stdout
  *    path/file.o: include/config/key*.h found_include_*.h
  *    path/inc.h: include/config/key*.h found_included_include_*.h
- * This programm does not generate dependencies for #include <...>
+ * This program does not generate dependencies for #include <...>
  */
 
 #define LOCAL_INCLUDE_PATH          "include"
@@ -87,6 +93,7 @@ static void parse_conf_opt(char *opt, const char *val, size_t rsz);
 
 /* for speed tricks */
 static char first_chars[257];  /* + L_EOF */
+static char isalnums[257];     /* + L_EOF */
 /* trick for fast find "define", "include", "undef" */
 static char first_chars_diu[256];
 
@@ -171,11 +178,13 @@ static void c_lex(const char *fname, long fsize)
   for(;;) {
         if(state == LI || state == DV) {
             /* store "include.h" or config mode #define KEY "|'..."|'  */
-            put_id(0);
             if(state == LI) {
+                put_id(0);
                 parse_inc(id, fname);
             } else {
                 /* #define KEY "[VAL]" */
+                put_id(c);  /* #define KEY "VALUE"<- */
+                put_id(0);
                 parse_conf_opt(id, val, (optr - start));
             }
             state = S;
@@ -243,14 +252,14 @@ static void c_lex(const char *fname, long fsize)
                            if key with this first char undefined */
                         if(first_chars[c] == 0) {
                             /* skip <S>[A-Z_a-z0-9]+ */
-                            do getc1(); while(ISALNUM(c));
+                            do getc1(); while(isalnums[c]);
                         } else {
                             id_len = 0;
                             do {
                                 /* <S>[A-Z_a-z0-9]+ */
                                 put_id(c);
                                 getc1();
-                            } while(ISALNUM(c));
+                            } while(isalnums[c]);
                             put_id(0);
                             check_key(key_top, id);
                         }
@@ -307,8 +316,6 @@ static void c_lex(const char *fname, long fsize)
                             put_id(c);
                 } else if(c == state) {
                         /* <STR>\" or <CHR>\' */
-                        if(called == DV)
-                            put_id(c);  /* #define KEY "VALUE"<- */
                         state = called;
                         break;
                 } else if(val)
@@ -337,7 +344,6 @@ static void c_lex(const char *fname, long fsize)
                 yy_error_d("strange preprocessor line");
         }
         if(state == POUND) {
-            const unsigned char *p = optr - 1;
             /* tricks */
             static const char * const preproc[] = {
                     /* 0-4 */
@@ -345,15 +351,12 @@ static void c_lex(const char *fname, long fsize)
                     /* 5 */   /* 6 */   /* 7 */
                     "undef", "define", "include",
             };
-            size_t readed = 0;
             size_t diu = first_chars_diu[c];   /* strlen and preproc ptr */
+            const unsigned char *p = optr - 1;
 
-            while(ISALNUM(c)) {
-                readed++;
-                getc1();
-            }
+            while(isalnums[c]) getc1();
             /* have str begined with c, readed == strlen key and compared */
-            if(diu != S && diu == readed && !memcmp(p, preproc[diu], diu)) {
+            if(diu != S && diu == (optr-p-1) && !memcmp(p, preproc[diu], diu)) {
                 state = *p;
                 id_len = 0; /* common for save */
             } else {
@@ -378,12 +381,12 @@ static void c_lex(const char *fname, long fsize)
         if(state == D || state == U) {
             if(mode == SOURCES_MODE) {
                 /* ignore depend with #define or #undef KEY */
-                while(ISALNUM(c))
+                while(isalnums[c])
                     getc1();
                 state = S;
             } else {
                 /* save KEY from #"define"|"undef" ... */
-                while(ISALNUM(c)) {
+                while(isalnums[c]) {
                     put_id(c);
                     getc1();
                 }
@@ -411,7 +414,7 @@ static void c_lex(const char *fname, long fsize)
                 state = c;
                 continue;
             }
-            while(ISALNUM(c)) {
+            while(isalnums[c]) {
                 /* VALUE */
                 put_id(c);
                 getc1();
@@ -542,10 +545,10 @@ static void parse_conf_opt(char *opt, const char *val, size_t recordsz)
             if(cur->value != NULL && val != NULL && strcmp(cur->value, val) == 0)
                 return;
             fprintf(stderr, "Warning: redefined %s\n", opt);
+        } else {
+            key_top = cur = make_new_key(key_top, opt);
         }
-        /* new or redefined key, check old key if present after previous usage */
-        key_top = cur = make_new_key(key_top, opt);
-
+        /* do generate record */
         recordsz += 2;  /* \n\0 */
         if(recordsz > r_sz) {
             record_buf = xrealloc(record_buf, r_sz=recordsz);
@@ -574,13 +577,13 @@ static void parse_conf_opt(char *opt, const char *val, size_t recordsz)
         for(p = opt; *p; p++) {
             if(*p >= 'A' && *p <= 'Z')
                     *p = *p - 'A' + 'a';
-            else if(*p == '_')
+            else if(*p == '_' && p[1] > '9')    /* do not change A_1 to A/1 */
                     *p = '/';
         }
-        p = bb_asprint("%s/%s.h", kp, opt);
-        cur->stored_path = opt = p;
+        /* check kp/key.h if present after previous usage */
+        cur->stored_path = opt = bb_asprint("%s/%s.h", kp, opt);
         if(stat(opt, &st)) {
-            p += kp_len;
+            p = opt + kp_len;
             while(*++p) {
                 /* Auto-create directories. */
                 if (*p == '/') {
@@ -812,9 +815,10 @@ int main(int argc, char **argv)
         pagesizem1 = getpagesize() - 1;
         id_s = xmalloc(mema_id);
         for(i = 0; i < 256; i++) {
+            if(ISALNUM(i))
+                isalnums[i] = i;
             /* set unparsed chars for speed up of parser */
-            if(!ISALNUM(i) && i != CHR && i != STR &&
-                              i != POUND && i != REM && i != BS)
+            else if(i != CHR && i != STR && i != POUND && i != REM && i != BS)
                 first_chars[i] = ANY;
         }
         first_chars[i] = '-';   /* L_EOF */