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perf symbols: Record whether a symbol is an alias for an IFUNC symbol 

To assist with synthesizing plt symbols for IFUNCs, record whether a
symbol is an alias of an IFUNC symbol.

Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230131131625.6964-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2023-01-31 15:16:20 +02:00 committed by Arnaldo Carvalho de Melo
parent 78250284b1
commit 05963491c0
2 changed files with 6 additions and 0 deletions
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4
tools/perf/util/symbol.c
View File

@ -201,10 +201,14 @@ again:
continue;
if (choose_best_symbol(curr, next) == SYMBOL_A) {
if (next->type == STT_GNU_IFUNC)
curr->ifunc_alias = true;
rb_erase_cached(&next->rb_node, symbols);
symbol__delete(next);
goto again;
} else {
if (curr->type == STT_GNU_IFUNC)
next->ifunc_alias = true;
nd = rb_next(&curr->rb_node);
rb_erase_cached(&curr->rb_node, symbols);
symbol__delete(curr);

2
tools/perf/util/symbol.h
View File

@ -64,6 +64,8 @@ struct symbol {
u8 inlined:1;
/** Has symbol__annotate2 been performed. */
u8 annotate2:1;
/** Symbol is an alias of an STT_GNU_IFUNC */
u8 ifunc_alias:1;
/** Architecture specific. Unused except on PPC where it holds st_other. */
u8 arch_sym;
/** The name of length namelen associated with the symbol. */