From 0fe578acbe986ae6d080f5839a7ed9f0eb76b54c Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Thu, 24 Oct 2019 18:12:45 +0900 Subject: perf probe: Walk function lines in lexical blocks [ Upstream commit acb6a7047ac2146b723fef69ee1ab6b7143546bf ] Since some inlined functions are in lexical blocks of given function, we have to recursively walk through the DIE tree. Without this fix, perf-probe -L can miss the inlined functions which is in a lexical block (like if (..) { func() } case.) However, even though, to walk the lines in a given function, we don't need to follow the children DIE of inlined functions because those do not have any lines in the specified function. We need to walk though whole trees only if we walk all lines in a given file, because an inlined function can include another inlined function in the same file. Fixes: b0e9cb2802d4 ("perf probe: Fix to search nested inlined functions in CU") Signed-off-by: Masami Hiramatsu Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lore.kernel.org/lkml/157190836514.1859.15996864849678136353.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/dwarf-aux.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'tools') diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index bc52b3840706..e5406e5adb68 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -691,10 +691,9 @@ static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data) if (lw->retval != 0) return DIE_FIND_CB_END; } + if (!lw->recursive) + return DIE_FIND_CB_SIBLING; } - if (!lw->recursive) - /* Don't need to search recursively */ - return DIE_FIND_CB_SIBLING; if (addr) { fname = dwarf_decl_file(in_die); @@ -741,6 +740,10 @@ static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data) { struct __line_walk_param *lw = data; + /* + * Since inlined function can include another inlined function in + * the same file, we need to walk in it recursively. + */ lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data); if (lw->retval != 0) return DWARF_CB_ABORT; @@ -830,8 +833,9 @@ int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data) */ if (rt_die != cu_die) /* - * Don't need walk functions recursively, because nested - * inlined functions don't have lines of the specified DIE. + * Don't need walk inlined functions recursively, because + * inner inlined functions don't have the lines of the + * specified function. */ ret = __die_walk_funclines(rt_die, false, callback, data); else { -- cgit v1.2.3