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[Dle-develop] [tip:perf/probes] perf probe: Check function address range strictly in line finder
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From: tip-bot f. M. H. <mhi...@re...> - 2010-02-25 19:32:42
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Commit-ID: 161a26b0c231b5d2e60e9c132fa360cd9dac4720 Gitweb: http://git.kernel.org/tip/161a26b0c231b5d2e60e9c132fa360cd9dac4720 Author: Masami Hiramatsu <mhi...@re...> AuthorDate: Thu, 25 Feb 2010 08:35:57 -0500 Committer: Ingo Molnar <mi...@el...> CommitDate: Thu, 25 Feb 2010 17:49:29 +0100 perf probe: Check function address range strictly in line finder Check (inlined) function address range strictly for improving output of probe-able lines of inline functions. Without this change, perf probe --line <function> sometimes showed other inline function bodies too, because it didn't filter out inlined functions. Signed-off-by: Masami Hiramatsu <mhi...@re...> Cc: systemtap <sys...@so...> Cc: DLE <dle...@li...> Cc: Frederic Weisbecker <fwe...@gm...> Cc: Arnaldo Carvalho de Melo <ac...@re...> Cc: Peter Zijlstra <pe...@in...> Cc: Paul Mackerras <pa...@sa...> Cc: Mike Galbraith <ef...@gm...> Cc: K.Prasad <pr...@li...> Cc: Ulrich Drepper <dr...@re...> Cc: Roland McGrath <ro...@re...> Cc: Frederic Weisbecker <fwe...@gm...> Cc: Ananth N Mavinakayanahalli <an...@in...> LKML-Reference: <20100225133557.6725.20697.stgit@localhost6.localdomain6> Signed-off-by: Ingo Molnar <mi...@el...> --- tools/perf/util/probe-finder.c | 74 ++++++++++++++++++++++++++++----------- tools/perf/util/probe-finder.h | 2 - 2 files changed, 53 insertions(+), 23 deletions(-) diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 6305f34..a410356 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -161,6 +161,31 @@ static Dwarf_Die *die_get_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr, return die_mem; } +/* Similar to dwarf_getfuncs, but returns inlined_subroutine if exists. */ +static Dwarf_Die *die_get_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, + Dwarf_Die *die_mem) +{ + Dwarf_Die child_die; + int ret; + + ret = dwarf_child(sp_die, die_mem); + if (ret != 0) + return NULL; + + do { + if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && + dwarf_haspc(die_mem, addr)) + return die_mem; + + if (die_get_inlinefunc(die_mem, addr, &child_die)) { + memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); + return die_mem; + } + } while (dwarf_siblingof(die_mem, die_mem) == 0); + + return NULL; +} + /* Compare diename and tname */ static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) { @@ -534,7 +559,7 @@ found: } /* Find line range from its line number */ -static void find_line_range_by_line(struct line_finder *lf) +static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) { Dwarf_Lines *lines; Dwarf_Line *line; @@ -543,6 +568,7 @@ static void find_line_range_by_line(struct line_finder *lf) int lineno; int ret; const char *src; + Dwarf_Die die_mem; INIT_LIST_HEAD(&lf->lr->line_list); ret = dwarf_getsrclines(&lf->cu_die, &lines, &nlines); @@ -550,22 +576,28 @@ static void find_line_range_by_line(struct line_finder *lf) for (i = 0; i < nlines; i++) { line = dwarf_onesrcline(lines, i); - dwarf_lineno(line, &lineno); + ret = dwarf_lineno(line, &lineno); + DIE_IF(ret != 0); if (lf->lno_s > lineno || lf->lno_e < lineno) continue; + if (sp_die) { + /* Address filtering 1: does sp_die include addr? */ + ret = dwarf_lineaddr(line, &addr); + DIE_IF(ret != 0); + if (!dwarf_haspc(sp_die, addr)) + continue; + + /* Address filtering 2: No child include addr? */ + if (die_get_inlinefunc(sp_die, addr, &die_mem)) + continue; + } + /* TODO: Get fileno from line, but how? */ src = dwarf_linesrc(line, NULL, NULL); if (strtailcmp(src, lf->fname) != 0) continue; - /* Filter line in the function address range */ - if (lf->addr_s && lf->addr_e) { - ret = dwarf_lineaddr(line, &addr); - DIE_IF(ret != 0); - if (lf->addr_s > addr || lf->addr_e <= addr) - continue; - } /* Copy real path */ if (!lf->lr->path) lf->lr->path = strdup(src); @@ -580,24 +612,20 @@ static void find_line_range_by_line(struct line_finder *lf) } } +static int line_range_inline_cb(Dwarf_Die *in_die, void *data) +{ + find_line_range_by_line(in_die, (struct line_finder *)data); + return DWARF_CB_ABORT; /* No need to find other instances */ +} + /* Search function from function name */ static int line_range_search_cb(Dwarf_Die *sp_die, void *data) { struct line_finder *lf = (struct line_finder *)data; struct line_range *lr = lf->lr; - int ret; if (dwarf_tag(sp_die) == DW_TAG_subprogram && die_compare_name(sp_die, lr->function) == 0) { - /* Get the address range of this function */ - ret = dwarf_highpc(sp_die, &lf->addr_e); - if (ret == 0) - ret = dwarf_lowpc(sp_die, &lf->addr_s); - if (ret != 0) { - lf->addr_s = 0; - lf->addr_e = 0; - } - lf->fname = dwarf_decl_file(sp_die); dwarf_decl_line(sp_die, &lr->offset); pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); @@ -608,7 +636,11 @@ static int line_range_search_cb(Dwarf_Die *sp_die, void *data) lf->lno_e = lr->offset + lr->end; lr->start = lf->lno_s; lr->end = lf->lno_e; - find_line_range_by_line(lf); + if (dwarf_func_inline(sp_die)) + dwarf_func_inline_instances(sp_die, + line_range_inline_cb, lf); + else + find_line_range_by_line(sp_die, lf); return 1; } return 0; @@ -660,7 +692,7 @@ int find_line_range(int fd, struct line_range *lr) lf.lno_e = INT_MAX; else lf.lno_e = lr->end; - find_line_range_by_line(&lf); + find_line_range_by_line(NULL, &lf); } } off = noff; diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h index 74525ae..75a660d 100644 --- a/tools/perf/util/probe-finder.h +++ b/tools/perf/util/probe-finder.h @@ -82,8 +82,6 @@ struct line_finder { const char *fname; /* File name */ int lno_s; /* Start line number */ int lno_e; /* End line number */ - Dwarf_Addr addr_s; /* Start address */ - Dwarf_Addr addr_e; /* End address */ Dwarf_Die cu_die; /* Current CU */ int found; }; |
