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Date: Fri, 31 Mar 2023 17:29:34 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v1 3/4] perf srcline: Support for llvm-addr2line
On Thu, Mar 30, 2023 at 5:49 PM Ian Rogers <irogers@...gle.com> wrote:
>
> The sentinel value differs for llvm-addr2line. Configure this once and
> then detect when reading records.
Thanks for fixing this!
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/util/srcline.c | 65 +++++++++++++++++++++++++++++++++++++--
> 1 file changed, 62 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
> index 2da86e57215d..423ddf3967b0 100644
> --- a/tools/perf/util/srcline.c
> +++ b/tools/perf/util/srcline.c
> @@ -435,7 +435,50 @@ static struct child_process *addr2line_subprocess_init(const char *addr2line_pat
> return a2l;
> }
>
> +enum a2l_style {
> + BROKEN,
> + GNU_BINUTILS,
> + LLVM,
> +};
> +
> +static enum a2l_style addr2line_configure(struct child_process *a2l)
> +{
> + static bool cached;
> + static enum a2l_style style;
> +
> + if (!cached) {
> + char buf[128];
> + struct io io;
> + int ch;
> +
> + if (write(a2l->in, ",\n", 2) != 2)
> + return BROKEN;
> +
> + io__init(&io, a2l->out, buf, sizeof(buf));
> + ch = io__get_char(&io);
> + if (ch == ',') {
> + style = LLVM;
> + cached = true;
> + } else if (ch == '?') {
> + style = GNU_BINUTILS;
> + cached = true;
> + } else {
> + style = BROKEN;
> + }
> + do {
> + ch = io__get_char(&io);
> + } while (ch > 0 && ch != '\n');
Maybe better to io__getline() ?
> + if (style == GNU_BINUTILS) {
> + do {
> + ch = io__get_char(&io);
> + } while (ch > 0 && ch != '\n');
> + }
> + }
> + return style;
> +}
> +
> static int read_addr2line_record(struct io *io,
> + enum a2l_style style,
> char **function,
> char **filename,
> unsigned int *line_nr)
> @@ -462,6 +505,12 @@ static int read_addr2line_record(struct io *io,
>
> if (io__getline(&line, &line_len, io) < 0 || !line_len)
> goto error;
> +
> + if (style == LLVM && line_len == 2 && line[0] == ',') {
> + zfree(&line);
> + return 0;
> + }
> +
> if (function != NULL)
> *function = strdup(strim(line));
>
> @@ -471,7 +520,8 @@ static int read_addr2line_record(struct io *io,
> if (io__getline(&line, &line_len, io) < 0 || !line_len)
> goto error;
>
> - if (filename_split(line, line_nr == NULL ? &dummy_line_nr : line_nr) == 0) {
> + if (filename_split(line, line_nr == NULL ? &dummy_line_nr : line_nr) == 0 &&
> + style == GNU_BINUTILS) {
> ret = 0;
> goto error;
> }
> @@ -523,6 +573,7 @@ static int addr2line(const char *dso_name, u64 addr,
> char buf[128];
> ssize_t written;
> struct io io;
> + enum a2l_style a2l_style;
>
> if (!a2l) {
> if (!filename__has_section(dso_name, ".debug_line"))
> @@ -538,6 +589,12 @@ static int addr2line(const char *dso_name, u64 addr,
> pr_warning("%s %s: addr2line_subprocess_init failed\n", __func__, dso_name);
> goto out;
> }
> + a2l_style = addr2line_configure(a2l);
> + if (a2l_style == BROKEN) {
> + if (!symbol_conf.disable_add2line_warn)
> + pr_warning("%s: addr2line configuration failed\n", __func__);
> + goto out;
> + }
>
> /*
> * Send our request and then *deliberately* send something that can't be interpreted as
Can you please update the comment about the LLVM behavior?
Thanks,
Namhyung
> @@ -557,7 +614,8 @@ static int addr2line(const char *dso_name, u64 addr,
> }
> io__init(&io, a2l->out, buf, sizeof(buf));
>
> - switch (read_addr2line_record(&io, &record_function, &record_filename, &record_line_nr)) {
> + switch (read_addr2line_record(&io, a2l_style,
> + &record_function, &record_filename, &record_line_nr)) {
> case -1:
> if (!symbol_conf.disable_add2line_warn)
> pr_warning("%s %s: could not read first record\n", __func__, dso_name);
> @@ -567,7 +625,7 @@ static int addr2line(const char *dso_name, u64 addr,
> * The first record was invalid, so return failure, but first read another
> * record, since we asked a junk question and have to clear the answer out.
> */
> - switch (read_addr2line_record(&io, NULL, NULL, NULL)) {
> + switch (read_addr2line_record(&io, a2l_style, NULL, NULL, NULL)) {
> case -1:
> if (!symbol_conf.disable_add2line_warn)
> pr_warning("%s %s: could not read delimiter record\n",
> @@ -606,6 +664,7 @@ static int addr2line(const char *dso_name, u64 addr,
>
> /* We have to read the records even if we don't care about the inline info. */
> while ((record_status = read_addr2line_record(&io,
> + a2l_style,
> &record_function,
> &record_filename,
> &record_line_nr)) == 1) {
> --
> 2.40.0.348.gf938b09366-goog
>
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