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- /*
- * Originally by Linus Torvalds.
- * Smart CONFIG_* processing by Werner Almesberger, Michael Chastain.
- *
- * Usage: mkdep file ...
- *
- * Read source files and output makefile dependency lines for them.
- * I make simple dependency lines for #include <*.h> and #include "*.h".
- * I also find instances of CONFIG_FOO and generate dependencies
- * like include/config/foo.h.
- */
-
- #include <ctype.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
-
- #include <sys/fcntl.h>
- #include <sys/mman.h>
- #include <sys/stat.h>
- #include <sys/types.h>
-
-
-
- char __depname[512] = "\n\t@touch ";
- #define depname (__depname+9)
- int hasdep;
-
- struct path_struct {
- int len;
- char buffer[256-sizeof(int)];
- } path_array[2] = {
- { 0, "" },
- { 0, "" }
- };
-
-
-
- /*
- * This records all the configuration options seen.
- * In perl this would be a hash, but here it's a long string
- * of values separated by newlines. This is simple and
- * extremely fast.
- */
- char * str_config = NULL;
- int size_config = 0;
- int len_config = 0;
-
-
-
- /*
- * Grow the configuration string to a desired length.
- * Usually the first growth is plenty.
- */
- void grow_config(int len)
- {
- if (str_config == NULL) {
- len_config = 0;
- size_config = 4096;
- str_config = malloc(4096);
- if (str_config == NULL)
- { perror("malloc"); exit(1); }
- }
-
- while (len_config + len > size_config) {
- str_config = realloc(str_config, size_config *= 2);
- if (str_config == NULL)
- { perror("malloc"); exit(1); }
- }
- }
-
-
-
- /*
- * Lookup a value in the configuration string.
- */
- int is_defined_config(const char * name, int len)
- {
- const char * pconfig;
- const char * plast = str_config + len_config - len;
- for ( pconfig = str_config + 1; pconfig < plast; pconfig++ ) {
- if (pconfig[ -1] == '\n'
- && pconfig[len] == '\n'
- && !memcmp(pconfig, name, len))
- return 1;
- }
- return 0;
- }
-
-
-
- /*
- * Add a new value to the configuration string.
- */
- void define_config(int convert, const char * name, int len)
- {
- grow_config(len + 1);
-
- memcpy(str_config+len_config, name, len);
-
- if (convert) {
- int i;
- for (i = 0; i < len; i++) {
- char c = str_config[len_config+i];
- if (isupper(c)) c = tolower(c);
- if (c == '_') c = '/';
- str_config[len_config+i] = c;
- }
- }
-
- len_config += len;
- str_config[len_config++] = '\n';
- }
-
-
-
- /*
- * Clear the set of configuration strings.
- */
- void clear_config(void)
- {
- len_config = 0;
- define_config(0, "", 0);
- }
-
-
-
- /*
- * Handle an #include line.
- */
- void handle_include(int type, const char * name, int len)
- {
- struct path_struct *path = path_array+type;
-
- if (len == 14 && !memcmp(name, "linux/config.h", len))
- return;
-
- if (len >= 7 && !memcmp(name, "config/", 7))
- define_config(0, name+7, len-7-2);
-
- memcpy(path->buffer+path->len, name, len);
- path->buffer[path->len+len] = '\0';
- if (access(path->buffer, F_OK) != 0)
- return;
-
- if (!hasdep) {
- hasdep = 1;
- printf("%s:", depname);
- }
- printf(" \\\n %s", path->buffer);
- }
-
-
-
- /*
- * Record the use of a CONFIG_* word.
- */
- void use_config(const char * name, int len)
- {
- char *pc;
- int i;
-
- pc = path_array[0].buffer + path_array[0].len;
- memcpy(pc, "config/", 7);
- pc += 7;
-
- for (i = 0; i < len; i++) {
- char c = name[i];
- if (isupper(c)) c = tolower(c);
- if (c == '_') c = '/';
- pc[i] = c;
- }
- pc[len] = '\0';
-
- if (is_defined_config(pc, len))
- return;
-
- define_config(0, pc, len);
-
- if (!hasdep) {
- hasdep = 1;
- printf("%s: ", depname);
- }
- printf(" \\\n $(wildcard %s.h)", path_array[0].buffer);
- }
-
-
-
- /*
- * Macros for stunningly fast map-based character access.
- * __buf is a register which holds the current word of the input.
- * Thus, there is one memory access per sizeof(unsigned long) characters.
- */
-
- #if defined(__alpha__) || defined(__i386__) || defined(__arm__)
- #define LE_MACHINE
- #endif
-
- #ifdef LE_MACHINE
- #define next_byte(x) (x >>= 8)
- #define current ((unsigned char) __buf)
- #else
- #define next_byte(x) (x <<= 8)
- #define current (__buf >> 8*(sizeof(unsigned long)-1))
- #endif
-
- #define GETNEXT { \
- next_byte(__buf); \
- if ((unsigned long) next % sizeof(unsigned long) == 0) { \
- if (next >= end) \
- break; \
- __buf = * (unsigned long *) next; \
- } \
- next++; \
- }
-
- /*
- * State machine macros.
- */
- #define CASE(c,label) if (current == c) goto label
- #define NOTCASE(c,label) if (current != c) goto label
-
- /*
- * Yet another state machine speedup.
- */
- #define MAX2(a,b) ((a)>(b)?(a):(b))
- #define MIN2(a,b) ((a)<(b)?(a):(b))
- #define MAX6(a,b,c,d,e,f) (MAX2(a,MAX2(b,MAX2(c,MAX2(d,MAX2(e,f))))))
- #define MIN6(a,b,c,d,e,f) (MIN2(a,MIN2(b,MIN2(c,MIN2(d,MIN2(e,f))))))
-
-
-
- /*
- * The state machine looks for (approximately) these Perl regular expressions:
- *
- * m|\/\*.*?\*\/|
- * m|'.*?'|
- * m|".*?"|
- * m|#\s*include\s*"(.*?)"|
- * m|#\s*include\s*<(.*?>"|
- * m|#\s*(?define|undef)\s*CONFIG_(\w*)|
- * m|(?!\w)CONFIG_|
- * m|__SMP__|
- *
- * About 98% of the CPU time is spent here, and most of that is in
- * the 'start' paragraph. Because the current characters are
- * in a register, the start loop usually eats 4 or 8 characters
- * per memory read. The MAX6 and MIN6 tests dispose of most
- * input characters with 1 or 2 comparisons.
- */
- void state_machine(const char * map, const char * end)
- {
- const char * next = map;
- const char * map_dot;
- unsigned long __buf = 0;
-
- for (;;) {
- start:
- GETNEXT
- __start:
- if (current > MAX6('/','\'','"','#','C','_')) goto start;
- if (current < MIN6('/','\'','"','#','C','_')) goto start;
- CASE('/', slash);
- CASE('\'', squote);
- CASE('"', dquote);
- CASE('#', pound);
- CASE('C', cee);
- CASE('_', underscore);
- goto start;
-
- /* / */
- slash:
- GETNEXT
- NOTCASE('*', __start);
- slash_star_dot_star:
- GETNEXT
- __slash_star_dot_star:
- NOTCASE('*', slash_star_dot_star);
- GETNEXT
- NOTCASE('/', __slash_star_dot_star);
- goto start;
-
- /* '.*?' */
- squote:
- GETNEXT
- CASE('\'', start);
- NOTCASE('\\', squote);
- GETNEXT
- goto squote;
-
- /* ".*?" */
- dquote:
- GETNEXT
- CASE('"', start);
- NOTCASE('\\', dquote);
- GETNEXT
- goto dquote;
-
- /* #\s* */
- pound:
- GETNEXT
- CASE(' ', pound);
- CASE('\t', pound);
- CASE('i', pound_i);
- CASE('d', pound_d);
- CASE('u', pound_u);
- goto __start;
-
- /* #\s*i */
- pound_i:
- GETNEXT NOTCASE('n', __start);
- GETNEXT NOTCASE('c', __start);
- GETNEXT NOTCASE('l', __start);
- GETNEXT NOTCASE('u', __start);
- GETNEXT NOTCASE('d', __start);
- GETNEXT NOTCASE('e', __start);
- goto pound_include;
-
- /* #\s*include\s* */
- pound_include:
- GETNEXT
- CASE(' ', pound_include);
- CASE('\t', pound_include);
- map_dot = next;
- CASE('"', pound_include_dquote);
- CASE('<', pound_include_langle);
- goto __start;
-
- /* #\s*include\s*"(.*)" */
- pound_include_dquote:
- GETNEXT
- CASE('\n', start);
- NOTCASE('"', pound_include_dquote);
- handle_include(1, map_dot, next - map_dot - 1);
- goto start;
-
- /* #\s*include\s*<(.*)> */
- pound_include_langle:
- GETNEXT
- CASE('\n', start);
- NOTCASE('>', pound_include_langle);
- handle_include(0, map_dot, next - map_dot - 1);
- goto start;
-
- /* #\s*d */
- pound_d:
- GETNEXT NOTCASE('e', __start);
- GETNEXT NOTCASE('f', __start);
- GETNEXT NOTCASE('i', __start);
- GETNEXT NOTCASE('n', __start);
- GETNEXT NOTCASE('e', __start);
- goto pound_define_undef;
-
- /* #\s*u */
- pound_u:
- GETNEXT NOTCASE('n', __start);
- GETNEXT NOTCASE('d', __start);
- GETNEXT NOTCASE('e', __start);
- GETNEXT NOTCASE('f', __start);
- goto pound_define_undef;
-
- /* #\s*(define|undef)\s*CONFIG_(\w*) */
- pound_define_undef:
- GETNEXT
- CASE(' ', pound_define_undef);
- CASE('\t', pound_define_undef);
-
- NOTCASE('C', __start);
- GETNEXT NOTCASE('O', __start);
- GETNEXT NOTCASE('N', __start);
- GETNEXT NOTCASE('F', __start);
- GETNEXT NOTCASE('I', __start);
- GETNEXT NOTCASE('G', __start);
- GETNEXT NOTCASE('_', __start);
-
- map_dot = next;
- pound_define_undef_CONFIG_word:
- GETNEXT
- if (isalnum(current) || current == '_')
- goto pound_define_undef_CONFIG_word;
- define_config(1, map_dot, next - map_dot - 1);
- goto __start;
-
- /* \<CONFIG_(\w*) */
- cee:
- if (next >= map+2 && (isalnum(next[-2]) || next[-2] == '_'))
- goto start;
- GETNEXT NOTCASE('O', __start);
- GETNEXT NOTCASE('N', __start);
- GETNEXT NOTCASE('F', __start);
- GETNEXT NOTCASE('I', __start);
- GETNEXT NOTCASE('G', __start);
- GETNEXT NOTCASE('_', __start);
-
- map_dot = next;
- cee_CONFIG_word:
- GETNEXT
- if (isalnum(current) || current == '_')
- goto cee_CONFIG_word;
- use_config(map_dot, next - map_dot - 1);
- goto __start;
-
- /* __SMP__ */
- underscore:
- GETNEXT NOTCASE('_', __start);
- GETNEXT NOTCASE('S', __start);
- GETNEXT NOTCASE('M', __start);
- GETNEXT NOTCASE('P', __start);
- GETNEXT NOTCASE('_', __start);
- GETNEXT NOTCASE('_', __start);
- use_config("SMP", 3);
- goto __start;
-
- }
- }
-
-
-
- /*
- * Generate dependencies for one file.
- */
- void do_depend(const char * filename, const char * command)
- {
- int mapsize;
- int pagesizem1 = getpagesize()-1;
- int fd;
- struct stat st;
- char * map;
-
- fd = open(filename, O_RDONLY);
- if (fd < 0) {
- perror(filename);
- return;
- }
-
- fstat(fd, &st);
- if (st.st_size == 0) {
- fprintf(stderr,"%s is empty\n",filename);
- close(fd);
- return;
- }
-
- mapsize = st.st_size;
- mapsize = (mapsize+pagesizem1) & ~pagesizem1;
- map = mmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0);
- if ((long) map == -1) {
- perror("mkdep: mmap");
- close(fd);
- return;
- }
- if ((unsigned long) map % sizeof(unsigned long) != 0)
- {
- fprintf(stderr, "do_depend: map not aligned\n");
- exit(1);
- }
-
- hasdep = 0;
- clear_config();
- state_machine(map, map+st.st_size);
- if (hasdep)
- puts(command);
-
- munmap(map, mapsize);
- close(fd);
- }
-
-
-
- /*
- * Generate dependencies for all files.
- */
- int main(int argc, char **argv)
- {
- int len;
- char *hpath;
-
- hpath = getenv("HPATH");
- if (!hpath) {
- fputs("mkdep: HPATH not set in environment. "
- "Don't bypass the top level Makefile.\n", stderr);
- return 1;
- }
- len = strlen(hpath);
- memcpy(path_array[0].buffer, hpath, len);
- if (len && hpath[len-1] != '/')
- path_array[0].buffer[len++] = '/';
- path_array[0].buffer[len] = '\0';
- path_array[0].len = len;
-
- while (--argc > 0) {
- const char * filename = *++argv;
- const char * command = __depname;
- len = strlen(filename);
- memcpy(depname, filename, len+1);
- if (len > 2 && filename[len-2] == '.') {
- if (filename[len-1] == 'c' || filename[len-1] == 'S') {
- depname[len-1] = 'o';
- command = "";
- }
- }
- do_depend(filename, command);
- }
- return 0;
- }
-