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SubjectRe: [PATCH v2 11/24] dyndbg: accept 'file foo.c:func1' and 'file foo.c:10-100'
On Sat 2020-06-13 09:57:25, Jim Cromie wrote:
> Accept these additional query forms:
>
> echo "file $filestr +_" > control
>
> path/to/file.c:100 # as from control, column 1
> path/to/file.c:1-100 # or any legal line-range
> path/to/file.c:func_A # as from an editor/browser
> path/to/file.c:drm_\* # wildcards still work
^

Should the backslash be there?

> path/to/file.c:*_foo # lead wildcard too
>
> 1st 2 examples are treated as line-ranges, 3,4 are treated as func's

There is also 5th example.

> Doc these changes, and sprinkle in a few extra wild-card examples and
> trailing # explanation texts.
> ---
> .../admin-guide/dynamic-debug-howto.rst | 5 +++++
> lib/dynamic_debug.c | 20 ++++++++++++++++++-
> 2 files changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst
> index 1423af580bed..6c04aea8f4cd 100644
> --- a/Documentation/admin-guide/dynamic-debug-howto.rst
> +++ b/Documentation/admin-guide/dynamic-debug-howto.rst
> @@ -164,6 +164,7 @@ func
> of each callsite. Example::
>
> func svc_tcp_accept
> + func *recv* # in rfcomm, bluetooth, ping, tcp
>
> file
> The given string is compared against either the src-root relative
> @@ -172,6 +173,9 @@ file
>
> file svcsock.c
> file kernel/freezer.c # ie column 1 of control file
> + file drivers/usb/* # all callsites under it
> + file inode.c:start_* # parse :tail as a func (above)
> + file inode.c:1-100 # parse :tail as a line-range (above)
>
> module
> The given string is compared against the module name
> @@ -181,6 +185,7 @@ module
>
> module sunrpc
> module nfsd
> + module drm* # both drm, drm_kms_helper
>
> format
> The given string is searched for in the dynamic debug format
> diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
> index f87a7bef4204..784c075c7db9 100644
> --- a/lib/dynamic_debug.c
> +++ b/lib/dynamic_debug.c
> @@ -322,6 +322,8 @@ static int parse_linerange(struct ddebug_query *query, const char *first)
> } else {
> query->last_lineno = query->first_lineno;
> }
> + vpr_info("parsed line %d-%d\n", query->first_lineno,
> + query->last_lineno);

Is this supposed to be in the final code?
I do not see such messages printed for other parsed variants.

> return 0;
> }
>
> @@ -358,6 +360,7 @@ static int ddebug_parse_query(char *words[], int nwords,
> {
> unsigned int i;
> int rc = 0;
> + char *fline;
>
> /* check we have an even number of words */
> if (nwords % 2 != 0) {
> @@ -374,7 +377,22 @@ static int ddebug_parse_query(char *words[], int nwords,
> if (!strcmp(words[i], "func")) {
> rc = check_set(&query->function, words[i+1], "func");
> } else if (!strcmp(words[i], "file")) {
> - rc = check_set(&query->filename, words[i+1], "file");
> + if (check_set(&query->filename, words[i+1], "file"))
> + return -EINVAL;

There is no reason to hard code the error code. It should look like:

rc = check_set(&query->filename, words[i+1], "file");
if (rc)
return rc;
> +
> + /* tail :$info is function or line-range */
> + fline = strchr(query->filename, ':');
> + if (!fline)
> + break;
> + *fline++ = '\0';
> + if (isalpha(*fline) || *fline == '*' || *fline == '?') {

I would do the oposite and check whether is starts with number.

> + /* take as function name */
> + if (check_set(&query->function, fline, "func"))
> + return -EINVAL;
> + } else {
> + if (parse_linerange(query, fline))
> + return -EINVAL;
> + }

Also I would hide this into another function:

rc = parse_filenane(...);


> } else if (!strcmp(words[i], "module")) {
> rc = check_set(&query->module, words[i+1], "module");
> } else if (!strcmp(words[i], "format")) {
> --
> 2.26.2

Best Regards,
Petr

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