Commit 05963491 authored Jan 31, 2023 by Adrian Hunter Committed by Arnaldo Carvalho de Melo Feb 01, 2023

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>

parent 78250284

tools/perf/util/symbol.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -201,10 +201,14 @@ void symbols__fixup_duplicate(struct rb_root_cached *symbols)
		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);

tools/perf/util/symbol.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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. */