--- /dev/null
+/*
+ * "Optimize" a list of dependencies as spit out by gcc -MD
+ * for the kernel build
+ * ===========================================================================
+ *
+ * Author Kai Germaschewski
+ * Copyright 2002 by Kai Germaschewski <kai.germaschewski@gmx.de>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ *
+ * Introduction:
+ *
+ * gcc produces a very nice and correct list of dependencies which
+ * tells make when to remake a file.
+ *
+ * To use this list as-is however has the drawback that virtually
+ * every file in the kernel includes autoconf.h.
+ *
+ * If the user re-runs make *config, autoconf.h will be
+ * regenerated. make notices that and will rebuild every file which
+ * includes autoconf.h, i.e. basically all files. This is extremely
+ * annoying if the user just changed CONFIG_HIS_DRIVER from n to m.
+ *
+ * So we play the same trick that "mkdep" played before. We replace
+ * the dependency on autoconf.h by a dependency on every config
+ * option which is mentioned in any of the listed prequisites.
+ *
+ * kconfig populates a tree in include/config/ with an empty file
+ * for each config symbol and when the configuration is updated
+ * the files representing changed config options are touched
+ * which then let make pick up the changes and the files that use
+ * the config symbols are rebuilt.
+ *
+ * So if the user changes his CONFIG_HIS_DRIVER option, only the objects
+ * which depend on "include/linux/config/his/driver.h" will be rebuilt,
+ * so most likely only his driver ;-)
+ *
+ * The idea above dates, by the way, back to Michael E Chastain, AFAIK.
+ *
+ * So to get dependencies right, there are two issues:
+ * o if any of the files the compiler read changed, we need to rebuild
+ * o if the command line given to the compile the file changed, we
+ * better rebuild as well.
+ *
+ * The former is handled by using the -MD output, the later by saving
+ * the command line used to compile the old object and comparing it
+ * to the one we would now use.
+ *
+ * Again, also this idea is pretty old and has been discussed on
+ * kbuild-devel a long time ago. I don't have a sensibly working
+ * internet connection right now, so I rather don't mention names
+ * without double checking.
+ *
+ * This code here has been based partially based on mkdep.c, which
+ * says the following about its history:
+ *
+ * Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
+ * This is a C version of syncdep.pl by Werner Almesberger.
+ *
+ *
+ * It is invoked as
+ *
+ * fixdep <depfile> <target> <cmdline>
+ *
+ * and will read the dependency file <depfile>
+ *
+ * The transformed dependency snipped is written to stdout.
+ *
+ * It first generates a line
+ *
+ * cmd_<target> = <cmdline>
+ *
+ * and then basically copies the .<target>.d file to stdout, in the
+ * process filtering out the dependency on autoconf.h and adding
+ * dependencies on include/config/my/option.h for every
+ * CONFIG_MY_OPTION encountered in any of the prequisites.
+ *
+ * It will also filter out all the dependencies on *.ver. We need
+ * to make sure that the generated version checksum are globally up
+ * to date before even starting the recursive build, so it's too late
+ * at this point anyway.
+ *
+ * The algorithm to grep for "CONFIG_..." is bit unusual, but should
+ * be fast ;-) We don't even try to really parse the header files, but
+ * merely grep, i.e. if CONFIG_FOO is mentioned in a comment, it will
+ * be picked up as well. It's not a problem with respect to
+ * correctness, since that can only give too many dependencies, thus
+ * we cannot miss a rebuild. Since people tend to not mention totally
+ * unrelated CONFIG_ options all over the place, it's not an
+ * efficiency problem either.
+ *
+ * (Note: it'd be easy to port over the complete mkdep state machine,
+ * but I don't think the added complexity is worth it)
+ */
+/*
+ * Note 2: if somebody writes HELLO_CONFIG_BOOM in a file, it will depend onto
+ * CONFIG_BOOM. This could seem a bug (not too hard to fix), but please do not
+ * fix it! Some UserModeLinux files (look at arch/um/) call CONFIG_BOOM as
+ * UML_CONFIG_BOOM, to avoid conflicts with /usr/include/linux/autoconf.h,
+ * through arch/um/include/uml-config.h; this fixdep "bug" makes sure that
+ * those files will have correct dependencies.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+#include <ctype.h>
+#include <arpa/inet.h>
+
+#define INT_CONF ntohl(0x434f4e46)
+#define INT_ONFI ntohl(0x4f4e4649)
+#define INT_NFIG ntohl(0x4e464947)
+#define INT_FIG_ ntohl(0x4649475f)
+
+char *target;
+char *depfile;
+char *cmdline;
+
+static void usage(void)
+{
+ fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
+ exit(1);
+}
+
+/*
+ * Print out the commandline prefixed with cmd_<target filename> :=
+ */
+static void print_cmdline(void)
+{
+ printf("cmd_%s := %s\n\n", target, cmdline);
+}
+
+struct item {
+ struct item *next;
+ unsigned int len;
+ unsigned int hash;
+ char name[0];
+};
+
+#define HASHSZ 256
+static struct item *hashtab[HASHSZ];
+
+static unsigned int strhash(const char *str, unsigned int sz)
+{
+ /* fnv32 hash */
+ unsigned int i, hash = 2166136261U;
+
+ for (i = 0; i < sz; i++)
+ hash = (hash ^ str[i]) * 0x01000193;
+ return hash;
+}
+
+/*
+ * Lookup a value in the configuration string.
+ */
+static int is_defined_config(const char *name, int len, unsigned int hash)
+{
+ struct item *aux;
+
+ for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
+ if (aux->hash == hash && aux->len == len &&
+ memcmp(aux->name, name, len) == 0)
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Add a new value to the configuration string.
+ */
+static void define_config(const char *name, int len, unsigned int hash)
+{
+ struct item *aux = malloc(sizeof(*aux) + len);
+
+ if (!aux) {
+ perror("fixdep:malloc");
+ exit(1);
+ }
+ memcpy(aux->name, name, len);
+ aux->len = len;
+ aux->hash = hash;
+ aux->next = hashtab[hash % HASHSZ];
+ hashtab[hash % HASHSZ] = aux;
+}
+
+/*
+ * Clear the set of configuration strings.
+ */
+static void clear_config(void)
+{
+ struct item *aux, *next;
+ unsigned int i;
+
+ for (i = 0; i < HASHSZ; i++) {
+ for (aux = hashtab[i]; aux; aux = next) {
+ next = aux->next;
+ free(aux);
+ }
+ hashtab[i] = NULL;
+ }
+}
+
+/*
+ * Record the use of a CONFIG_* word.
+ */
+static void use_config(const char *m, int slen)
+{
+ unsigned int hash = strhash(m, slen);
+ int c, i;
+
+ if (is_defined_config(m, slen, hash))
+ return;
+
+ define_config(m, slen, hash);
+
+ printf(" $(wildcard include/config/");
+ for (i = 0; i < slen; i++) {
+ c = m[i];
+ if (c == '_')
+ c = '/';
+ else
+ c = tolower(c);
+ putchar(c);
+ }
+ printf(".h) \\\n");
+}
+
+static void parse_config_file(const char *map, size_t len)
+{
+ const int *end = (const int *) (map + len);
+ /* start at +1, so that p can never be < map */
+ const int *m = (const int *) map + 1;
+ const char *p, *q;
+
+ for (; m < end; m++) {
+ if (*m == INT_CONF) { p = (char *) m ; goto conf; }
+ if (*m == INT_ONFI) { p = (char *) m-1; goto conf; }
+ if (*m == INT_NFIG) { p = (char *) m-2; goto conf; }
+ if (*m == INT_FIG_) { p = (char *) m-3; goto conf; }
+ continue;
+ conf:
+ if (p > map + len - 7)
+ continue;
+ if (memcmp(p, "CONFIG_", 7))
+ continue;
+ for (q = p + 7; q < map + len; q++) {
+ if (!(isalnum(*q) || *q == '_'))
+ goto found;
+ }
+ continue;
+
+ found:
+ if (!memcmp(q - 7, "_MODULE", 7))
+ q -= 7;
+ if( (q-p-7) < 0 )
+ continue;
+ use_config(p+7, q-p-7);
+ }
+}
+
+/* test is s ends in sub */
+static int strrcmp(char *s, char *sub)
+{
+ int slen = strlen(s);
+ int sublen = strlen(sub);
+
+ if (sublen > slen)
+ return 1;
+
+ return memcmp(s + slen - sublen, sub, sublen);
+}
+
+static void do_config_file(const char *filename)
+{
+ struct stat st;
+ int fd;
+ void *map;
+
+ fd = open(filename, O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "fixdep: error opening config file: ");
+ perror(filename);
+ exit(2);
+ }
+ fstat(fd, &st);
+ if (st.st_size == 0) {
+ close(fd);
+ return;
+ }
+ map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if ((long) map == -1) {
+ perror("fixdep: mmap");
+ close(fd);
+ return;
+ }
+
+ parse_config_file(map, st.st_size);
+
+ munmap(map, st.st_size);
+
+ close(fd);
+}
+
+/*
+ * Important: The below generated source_foo.o and deps_foo.o variable
+ * assignments are parsed not only by make, but also by the rather simple
+ * parser in scripts/mod/sumversion.c.
+ */
+static void parse_dep_file(void *map, size_t len)
+{
+ char *m = map;
+ char *end = m + len;
+ char *p;
+ char s[PATH_MAX];
+ int is_target;
+ int saw_any_target = 0;
+ int is_first_dep = 0;
+
+ clear_config();
+
+ while (m < end) {
+ /* Skip any "white space" */
+ while (m < end && (*m == ' ' || *m == '\\' || *m == '\n'))
+ m++;
+ /* Find next "white space" */
+ p = m;
+ while (p < end && *p != ' ' && *p != '\\' && *p != '\n')
+ p++;
+ /* Is the token we found a target name? */
+ is_target = (*(p-1) == ':');
+ /* Don't write any target names into the dependency file */
+ if (is_target) {
+ /* The /next/ file is the first dependency */
+ is_first_dep = 1;
+ } else {
+ /* Save this token/filename */
+ memcpy(s, m, p-m);
+ s[p - m] = 0;
+
+ /* Ignore certain dependencies */
+ if (strrcmp(s, "include/generated/autoconf.h") &&
+ strrcmp(s, "arch/um/include/uml-config.h") &&
+ strrcmp(s, "include/linux/kconfig.h") &&
+ strrcmp(s, ".ver")) {
+ /*
+ * Do not list the source file as dependency,
+ * so that kbuild is not confused if a .c file
+ * is rewritten into .S or vice versa. Storing
+ * it in source_* is needed for modpost to
+ * compute srcversions.
+ */
+ if (is_first_dep) {
+ /*
+ * If processing the concatenation of
+ * multiple dependency files, only
+ * process the first target name, which
+ * will be the original source name,
+ * and ignore any other target names,
+ * which will be intermediate temporary
+ * files.
+ */
+ if (!saw_any_target) {
+ saw_any_target = 1;
+ printf("source_%s := %s\n\n",
+ target, s);
+ printf("deps_%s := \\\n",
+ target);
+ }
+ is_first_dep = 0;
+ } else
+ printf(" %s \\\n", s);
+ do_config_file(s);
+ }
+ }
+ /*
+ * Start searching for next token immediately after the first
+ * "whitespace" character that follows this token.
+ */
+ m = p + 1;
+ }
+
+ if (!saw_any_target) {
+ fprintf(stderr, "fixdep: parse error; no targets found\n");
+ exit(1);
+ }
+
+ printf("\n%s: $(deps_%s)\n\n", target, target);
+ printf("$(deps_%s):\n", target);
+}
+
+static void print_deps(void)
+{
+ struct stat st;
+ int fd;
+ void *map;
+
+ fd = open(depfile, O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "fixdep: error opening depfile: ");
+ perror(depfile);
+ exit(2);
+ }
+ if (fstat(fd, &st) < 0) {
+ fprintf(stderr, "fixdep: error fstat'ing depfile: ");
+ perror(depfile);
+ exit(2);
+ }
+ if (st.st_size == 0) {
+ fprintf(stderr,"fixdep: %s is empty\n",depfile);
+ close(fd);
+ return;
+ }
+ map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if ((long) map == -1) {
+ perror("fixdep: mmap");
+ close(fd);
+ return;
+ }
+
+ parse_dep_file(map, st.st_size);
+
+ munmap(map, st.st_size);
+
+ close(fd);
+}
+
+static void traps(void)
+{
+ static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
+ int *p = (int *)test;
+
+ if (*p != INT_CONF) {
+ fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianness? %#x\n",
+ *p);
+ exit(2);
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ traps();
+
+ if (argc != 4)
+ usage();
+
+ depfile = argv[1];
+ target = argv[2];
+ cmdline = argv[3];
+
+ print_cmdline();
+ print_deps();
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff