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-rw-r--r--scripts/basic/fixdep.c238
1 files changed, 160 insertions, 78 deletions
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index f932aeaba71a..fa562806c2be 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -70,7 +70,7 @@
*
* It first generates a line
*
- * cmd_<target> = <cmdline>
+ * savedcmd_<target> = <cmdline>
*
* and then basically copies the .<target>.d file to stdout, in the
* process filtering out the dependency on autoconf.h and adding
@@ -94,6 +94,7 @@
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
+#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
@@ -112,7 +113,7 @@ struct item {
};
#define HASHSZ 256
-static struct item *hashtab[HASHSZ];
+static struct item *config_hashtab[HASHSZ], *file_hashtab[HASHSZ];
static unsigned int strhash(const char *str, unsigned int sz)
{
@@ -125,24 +126,10 @@ static unsigned int strhash(const char *str, unsigned int sz)
}
/*
- * 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)
+static void add_to_hashtable(const char *name, int len, unsigned int hash,
+ struct item *hashtab[])
{
struct item *aux = malloc(sizeof(*aux) + len);
@@ -158,16 +145,33 @@ static void define_config(const char *name, int len, unsigned int hash)
}
/*
+ * Lookup a string in the hash table. If found, just return true.
+ * If not, add it to the hashtable and return false.
+ */
+static bool in_hashtable(const char *name, int len, struct item *hashtab[])
+{
+ struct item *aux;
+ unsigned int hash = strhash(name, len);
+
+ for (aux = hashtab[hash % HASHSZ]; aux; aux = aux->next) {
+ if (aux->hash == hash && aux->len == len &&
+ memcmp(aux->name, name, len) == 0)
+ return true;
+ }
+
+ add_to_hashtable(name, len, hash, hashtab);
+
+ return false;
+}
+
+/*
* Record the use of a CONFIG_* word.
*/
static void use_config(const char *m, int slen)
{
- unsigned int hash = strhash(m, slen);
-
- if (is_defined_config(m, slen, hash))
- return;
+ if (in_hashtable(m, slen, config_hashtab))
+ return;
- define_config(m, slen, hash);
/* Print out a dependency path from a symbol name. */
printf(" $(wildcard include/config/%.*s) \\\n", slen, m);
}
@@ -246,80 +250,158 @@ static int is_ignored_file(const char *s, int len)
str_ends_with(s, len, "include/generated/autoksyms.h");
}
+/* Do not parse these files */
+static int is_no_parse_file(const char *s, int len)
+{
+ /* rustc may list binary files in dep-info */
+ return str_ends_with(s, len, ".rlib") ||
+ str_ends_with(s, len, ".rmeta") ||
+ str_ends_with(s, len, ".so");
+}
+
/*
* 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(char *m, const char *target)
+static void parse_dep_file(char *p, const char *target)
{
- char *p;
- int is_last, is_target;
- int saw_any_target = 0;
- int is_first_dep = 0;
- void *buf;
-
- while (1) {
- /* Skip any "white space" */
- while (*m == ' ' || *m == '\\' || *m == '\n')
- m++;
-
- if (!*m)
+ bool saw_any_target = false;
+ bool is_target = true;
+ bool is_source = false;
+ bool need_parse;
+ char *q, saved_c;
+
+ while (*p) {
+ /* handle some special characters first. */
+ switch (*p) {
+ case '#':
+ /*
+ * skip comments.
+ * rustc may emit comments to dep-info.
+ */
+ p++;
+ while (*p != '\0' && *p != '\n') {
+ /*
+ * escaped newlines continue the comment across
+ * multiple lines.
+ */
+ if (*p == '\\')
+ p++;
+ p++;
+ }
+ continue;
+ case ' ':
+ case '\t':
+ /* skip whitespaces */
+ p++;
+ continue;
+ case '\\':
+ /*
+ * backslash/newline combinations continue the
+ * statement. Skip it just like a whitespace.
+ */
+ if (*(p + 1) == '\n') {
+ p += 2;
+ continue;
+ }
break;
-
- /* Find next "white space" */
- p = m;
- while (*p && *p != ' ' && *p != '\\' && *p != '\n')
+ case '\n':
+ /*
+ * Makefiles use a line-based syntax, where the newline
+ * is the end of a statement. After seeing a newline,
+ * we expect the next token is a target.
+ */
p++;
- is_last = (*p == '\0');
- /* 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 if (!is_ignored_file(m, p - m)) {
- *p = '\0';
-
+ is_target = true;
+ continue;
+ case ':':
/*
- * 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.
+ * assume the first dependency after a colon as the
+ * source file.
*/
- if (is_first_dep) {
+ p++;
+ is_target = false;
+ is_source = true;
+ continue;
+ }
+
+ /* find the end of the token */
+ q = p;
+ while (*q != ' ' && *q != '\t' && *q != '\n' && *q != '#' && *q != ':') {
+ if (*q == '\\') {
/*
- * 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.
+ * backslash/newline combinations work like as
+ * a whitespace, so this is the end of token.
*/
- if (!saw_any_target) {
- saw_any_target = 1;
- printf("source_%s := %s\n\n",
- target, m);
- printf("deps_%s := \\\n", target);
+ if (*(q + 1) == '\n')
+ break;
+
+ /* escaped special characters */
+ if (*(q + 1) == '#' || *(q + 1) == ':') {
+ memmove(p + 1, p, q - p);
+ p++;
}
- is_first_dep = 0;
- } else {
- printf(" %s \\\n", m);
+
+ q++;
}
- buf = read_file(m);
- parse_config_file(buf);
- free(buf);
+ if (*q == '\0')
+ break;
+ q++;
}
- if (is_last)
- break;
+ /* Just discard the target */
+ if (is_target) {
+ p = q;
+ continue;
+ }
+
+ saved_c = *q;
+ *q = '\0';
+ need_parse = false;
/*
- * Start searching for next token immediately after the first
- * "whitespace" character that follows this token.
+ * 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.
*/
- m = p + 1;
+ if (is_source) {
+ /*
+ * The DT build rule concatenates multiple dep files.
+ * When processing them, only process the first source
+ * name, which will be the original one, and ignore any
+ * other source names, which will be intermediate
+ * temporary files.
+ *
+ * rustc emits the same dependency list for each
+ * emission type. It is enough to list the source name
+ * just once.
+ */
+ if (!saw_any_target) {
+ saw_any_target = true;
+ printf("source_%s := %s\n\n", target, p);
+ printf("deps_%s := \\\n", target);
+ need_parse = true;
+ }
+ } else if (!is_ignored_file(p, q - p) &&
+ !in_hashtable(p, q - p, file_hashtab)) {
+ printf(" %s \\\n", p);
+ need_parse = true;
+ }
+
+ if (need_parse && !is_no_parse_file(p, q - p)) {
+ void *buf;
+
+ buf = read_file(p);
+ parse_config_file(buf);
+ free(buf);
+ }
+
+ is_source = false;
+ *q = saved_c;
+ p = q;
}
if (!saw_any_target) {
@@ -343,7 +425,7 @@ int main(int argc, char *argv[])
target = argv[2];
cmdline = argv[3];
- printf("cmd_%s := %s\n\n", target, cmdline);
+ printf("savedcmd_%s := %s\n\n", target, cmdline);
buf = read_file(depfile);
parse_dep_file(buf, target);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-12 21:14:30 +0000