by 平松雅巳 / HIRAMATU，MASAMI

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Subject: [tip:perf/urgent] perf probe: Fix listing incorrect line number with inline function

Commit-ID: 1d46ea2a6a405196435ffcc2adb3ef5402a30b3a
Gitweb: http://git.kernel.org/tip/1d46ea2a6a405196435ffcc2adb3ef5402a30b3a
Author: Masami Hiramatsu <[email protected]>
AuthorDate: Wed, 30 Mar 2011 18:26:05 +0900
Committer: Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Tue, 5 Apr 2011 15:38:12 -0300

perf probe: Fix listing incorrect line number with inline function

Fix a bug showing incorrect line number when a probe is put on the head of an
inline function. This patch updates find_perf_probe_point() and introduces new
rules to get correct line number.

- If debuginfo doesn't have a correct file name, we shouldn't return line
number too, because, without file name, line number is meaningless.

- If the address is in a function, it stores the function name and the offset
from the function entry.

- If the address is on a line, it tries to get the relative line number from
the function entry line, except for the address is same as the entry
address of the function (in this case, the relative line number should
be 0).

- If the address is in an inline function entry (call-site), it uses the
inline function call line number as the line on which the address is.

- If the address is in an inline function body, it stores the inline
function name and offset from the inline function call site instead of the
(non-inlined) function.

Cc: [email protected]
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Lin Ming <[email protected]>
Cc: Peter Zijlstra <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/util/probe-finder.c | 134 ++++++++++++++++++++++++----------------
1 files changed, 81 insertions(+), 53 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 689ab46..b7c85ce 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -273,6 +273,25 @@ static const char *cu_get_comp_dir(Dwarf_Die *cu_die)
return dwarf_formstring(&attr);
}

+/* Get a line number and file name for given address */
+static int cu_find_lineinfo(Dwarf_Die *cudie, unsigned long addr,
+ const char **fname, int *lineno)
+{
+ Dwarf_Line *line;
+ Dwarf_Addr laddr;
+
+ line = dwarf_getsrc_die(cudie, (Dwarf_Addr)addr);
+ if (line && dwarf_lineaddr(line, &laddr) == 0 &&
+ addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) {
+ *fname = dwarf_linesrc(line, NULL, NULL);
+ if (!*fname)
+ /* line number is useless without filename */
+ *lineno = 0;
+ }
+
+ return *lineno ?: -ENOENT;
+}
+
/* Compare diename and tname */
static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
{
@@ -1704,11 +1723,9 @@ int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
Dwarf_Die cudie, spdie, indie;
Dwarf *dbg = NULL;
Dwfl *dwfl = NULL;
- Dwarf_Line *line;
- Dwarf_Addr laddr, eaddr, bias = 0;
- const char *tmp;
- int lineno, ret = 0;
- bool found = false;
+ Dwarf_Addr _addr, baseaddr, bias = 0;
+ const char *fname = NULL, *func = NULL, *tmp;
+ int baseline = 0, lineno = 0, ret = 0;

/* Open the live linux kernel */
dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias);
@@ -1729,68 +1746,79 @@ int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
goto end;
}

- /* Find a corresponding line */
- line = dwarf_getsrc_die(&cudie, (Dwarf_Addr)addr);
- if (line) {
- if (dwarf_lineaddr(line, &laddr) == 0 &&
- (Dwarf_Addr)addr == laddr &&
- dwarf_lineno(line, &lineno) == 0) {
- tmp = dwarf_linesrc(line, NULL, NULL);
- if (tmp) {
- ppt->line = lineno;
- ppt->file = strdup(tmp);
- if (ppt->file == NULL) {
- ret = -ENOMEM;
- goto end;
- }
- found = true;
- }
- }
- }
+ /* Find a corresponding line (filename and lineno) */
+ cu_find_lineinfo(&cudie, addr, &fname, &lineno);
+ /* Don't care whether it failed or not */

- /* Find a corresponding function */
+ /* Find a corresponding function (name, baseline and baseaddr) */
if (die_find_real_subprogram(&cudie, (Dwarf_Addr)addr, &spdie)) {
+ /* Get function entry information */
tmp = dwarf_diename(&spdie);
- if (!tmp || dwarf_entrypc(&spdie, &eaddr) != 0)
- goto end;
-
- if (ppt->line) {
- if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr,
- &indie)) {
- /* addr in an inline function */
+ if (!tmp ||
+ dwarf_entrypc(&spdie, &baseaddr) != 0 ||
+ dwarf_decl_line(&spdie, &baseline) != 0)
+ goto post;
+ func = tmp;
+
+ if (addr == (unsigned long)baseaddr)
+ /* Function entry - Relative line number is 0 */
+ lineno = baseline;
+ else if (die_find_inlinefunc(&spdie, (Dwarf_Addr)addr,
+ &indie)) {
+ if (dwarf_entrypc(&indie, &_addr) == 0 &&
+ _addr == addr)
+ /*
+ * addr is at an inline function entry.
+ * In this case, lineno should be the call-site
+ * line number.
+ */
+ lineno = die_get_call_lineno(&indie);
+ else {
+ /*
+ * addr is in an inline function body.
+ * Since lineno points one of the lines
+ * of the inline function, baseline should
+ * be the entry line of the inline function.
+ */
tmp = dwarf_diename(&indie);
- if (!tmp)
- goto end;
- ret = dwarf_decl_line(&indie, &lineno);
- } else {
- if (eaddr == addr) { /* Function entry */
- lineno = ppt->line;
- ret = 0;
- } else
- ret = dwarf_decl_line(&spdie, &lineno);
- }
- if (ret == 0) {
- /* Make a relative line number */
- ppt->line -= lineno;
- goto found;
+ if (tmp &&
+ dwarf_decl_line(&spdie, &baseline) == 0)
+ func = tmp;
}
}
- /* We don't have a line number, let's use offset */
- ppt->offset = addr - (unsigned long)eaddr;
-found:
- ppt->function = strdup(tmp);
+ }
+
+post:
+ /* Make a relative line number or an offset */
+ if (lineno)
+ ppt->line = lineno - baseline;
+ else if (func)
+ ppt->offset = addr - (unsigned long)baseaddr;
+
+ /* Duplicate strings */
+ if (func) {
+ ppt->function = strdup(func);
if (ppt->function == NULL) {
ret = -ENOMEM;
goto end;
}
- found = true;
}
-
+ if (fname) {
+ ppt->file = strdup(fname);
+ if (ppt->file == NULL) {
+ if (ppt->function) {
+ free(ppt->function);
+ ppt->function = NULL;
+ }
+ ret = -ENOMEM;
+ goto end;
+ }
+ }
end:
if (dwfl)
dwfl_end(dwfl);
- if (ret >= 0)
- ret = found ? 1 : 0;
+ if (ret == 0 && (fname || func))
+ ret = 1; /* Found a point */
return ret;
}