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modpost: expand pattern matching to support substring matches

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Currently the match() function supports a leading * to match any
prefix and a trailing * to match any suffix.  However there currently
is not a combination of both that can be used to target matches of
whole families of functions that share a common substring.

Here we expand the *foo and foo* match to also support *foo* with
the goal of targeting compiler generated symbol names that contain
strings like ".constprop." and ".isra."

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Paul Gortmaker 2015-04-20 10:20:26 +09:30 committed by Rusty Russell
parent c5c3439af0
commit 09c20c032b
1 changed files with 11 additions and 1 deletions
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12
scripts/mod/modpost.c
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@ -776,6 +776,7 @@ static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
* "foo" will match an exact string equal to "foo"
* "*foo" will match a string that ends with "foo"
* "foo*" will match a string that begins with "foo"
* "*foo*" will match a string that contains "foo"
*/
static int match(const char *sym, const char * const pat[])
{
@ -784,8 +785,17 @@ static int match(const char *sym, const char * const pat[])
p = *pat++;
const char *endp = p + strlen(p) - 1;
/* "*foo*" */
if (*p == '*' && *endp == '*') {
char *here, *bare = strndup(p + 1, strlen(p) - 2);
here = strstr(sym, bare);
free(bare);
if (here != NULL)
return 1;
}
/* "*foo" */
if (*p == '*') {
else if (*p == '*') {
if (strrcmp(sym, p + 1) == 0)
return 1;
}