[review] Clarify purpose of assert in _dl_lookup_symbol_x

["Gabriel F. T. Gomes (Code Review)" <gerrit@gnutoolchain-gerrit.osci.io>]

Gabriel F. T. Gomes has posted comments on this change.

Change URL: https://gnutoolchain-gerrit.osci.io/r/c/glibc/+/469
......................................................................


Patch Set 1: Code-Review+1

(1 comment)

Hi, Florian,

This cleanup looks good to me.  Thanks.

Reviewed-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>

| --- elf/dl-lookup.c
| +++ elf/dl-lookup.c
| @@ -793,16 +793,14 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map,
|    bump_num_relocations ();
|  
| -  /* No other flag than DL_LOOKUP_ADD_DEPENDENCY or DL_LOOKUP_GSCOPE_LOCK
| -     is allowed if we look up a versioned symbol.  */
| -  assert (version == NULL
| -	  || (flags & ~(DL_LOOKUP_ADD_DEPENDENCY | DL_LOOKUP_GSCOPE_LOCK))
| -	     == 0);
| +  /* DL_LOOKUP_RETURN_NEWEST does not make sense for versioned
| +     lookups.  */
| +  assert (version == NULL || !(flags & DL_LOOKUP_RETURN_NEWEST));

PS1, Line 797:

Checking for the incompatible flag makes more sense, imo, too.

|  
|    size_t i = 0;
|    if (__glibc_unlikely (skip_map != NULL))
|      /* Search the relevant loaded objects for a definition.  */
|      while ((*scope)->r_list[i] != skip_map)
|        ++i;
|  
|    /* Search the relevant loaded objects for a definition.  */
|    for (size_t start = i; *scope != NULL; start = 0, ++scope)

-- 
Gerrit-Project: glibc
Gerrit-Branch: master
Gerrit-Change-Id: I3384349cef90cfd91862ebc34a4053f0c0a99404
Gerrit-Change-Number: 469
Gerrit-PatchSet: 1
Gerrit-Owner: Florian Weimer <fweimer@redhat.com>
Gerrit-Reviewer: Gabriel F. T. Gomes <gabriel@inconstante.net.br>
Gerrit-Comment-Date: Tue, 12 Nov 2019 12:47:09 +0000
Gerrit-HasComments: Yes
Gerrit-Has-Labels: Yes
Gerrit-MessageType: comment