Re: [PATCH] When using -fprofile-generate=/some/path mangle absolute path of file (PR lto/85759).

["Bin.Cheng" <amker dot cheng at gmail dot com>]

On Fri, Jun 29, 2018 at 9:54 PM, Martin Liška <mliska@suse.cz> wrote:
> On 06/22/2018 10:35 PM, Jeff Law wrote:
>> On 05/16/2018 05:53 AM, Martin Liška wrote:
>>> On 12/21/2017 10:13 AM, Martin Liška wrote:
>>>> On 12/20/2017 06:45 PM, Jakub Jelinek wrote:
>>>>> Another thing is that the "/" in there is wrong, so
>>>>>   const char dir_separator_str[] = { DIR_SEPARATOR, '\0' };
>>>>>   char *b = concat (profile_data_prefix, dir_separator_str, pwd, NULL);
>>>>> needs to be used instead.
>>>> This looks much nicer, I forgot about DIR_SEPARATOR.
>>>>
>>>>> Does profile_data_prefix have any dir separators stripped from the end?
>>>> That's easy to achieve..
>>>>
>>>>> Is pwd guaranteed to be relative in this case?
>>>> .. however this is absolute path, which would be problematic on a DOC based FS.
>>>> Maybe we should do the same path mangling as we do for purpose of gcov:
>>>>
>>>> https://github.com/gcc-mirror/gcc/blob/master/gcc/gcov.c#L2424
>>> Hi.
>>>
>>> I decided to implement that. Which means for:
>>>
>>> $ gcc -fprofile-generate=/tmp/myfolder empty.c -O2 && ./a.out
>>>
>>> we get following file:
>>> /tmp/myfolder/#home#marxin#Programming#testcases#tmp#empty.gcda
>>>
>>> That guarantees we have a unique file path. As seen in the PR it
>>> can produce a funny ICE.
>>>
>>> I've been testing the patch.
>>> Ready after it finishes tests?
>>>
>>> Martin
>>>
>>>> What do you think about it?
>>>> Regarding the string manipulation: I'm not an expert, but work with string in C
>>>> is for me always a pain :)
>>>>
>>>> Martin
>>>>
>>>
>>> 0001-When-using-fprofile-generate-some-path-mangle-absolu.patch
>>>
>>>
>>> From 386a4561a4d1501e8959871791289e95f6a89af5 Mon Sep 17 00:00:00 2001
>>> From: marxin <mliska@suse.cz>
>>> Date: Wed, 16 Aug 2017 10:22:57 +0200
>>> Subject: [PATCH] When using -fprofile-generate=/some/path mangle absolute path
>>>  of file (PR lto/85759).
>>>
>>> gcc/ChangeLog:
>>>
>>> 2018-05-16  Martin Liska  <mliska@suse.cz>
>>>
>>>      PR lto/85759
>>>      * coverage.c (coverage_init): Mangle full path name.
>>>      * doc/invoke.texi: Document the change.
>>>      * gcov-io.c (mangle_path): New.
>>>      * gcov-io.h (mangle_path): Likewise.
>>>      * gcov.c (mangle_name): Use mangle_path for path mangling.
>> ISTM you can self-approve this now if you want it to move forward :-)
>>
>> jeff
>>
>
> Sure, let me install the patch then.
Hi,
I am a bit confused after path mangling change.
Now with below command line:
$ ./gcc -O2 -fprofile-use=./ sort.c -o sort.c
or
$ ./gcc -O2 -fprofile-use=./sort.gcda sort.c -o sort.c

The da_file_name and the final name used in gcov_open is as:

$ p name
$11 = 0x2e63050
./#home#chengbin.cb#work#gcc-patches#trunk-orig#target.build#bin#sort.gcda
or
p da_file_name
$1 = 0x2e63050 "sort.gcda/#home#chengbin.cb#work#gcc-patches#trunk-orig#target.build#bin#sort.gcda"


These are not valid paths?  Or how should I modify the command line options?

Thanks,
bin
>
> Martin