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Message-Id: <1480431344-1644-2-git-send-email-yao.jin@linux.intel.com>
Date: Tue, 29 Nov 2016 22:55:41 +0800
From: Jin Yao <yao.jin@...ux.intel.com>
To: acme@...nel.org, jolsa@...nel.org
Cc: Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...ux.intel.com
Subject: [PATCH v1 1/4] perf report: Find the inline stack for a given address
It would be useful for perf to support a mode to query the
inline stack for a given callgraph address. This would simplify
finding the right code in code that does a lot of inlining.
The srcline.c has contained the code which supports to translate
the address to filename:line_nr. This patch just extends the
function to let it support getting the inline stacks.
The results (filename:line_nr) would be saved in a list and
returned to the caller.
Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
tools/perf/util/srcline.c | 206 +++++++++++++++++++++++++++++++++++++++-------
tools/perf/util/util.h | 15 ++++
2 files changed, 193 insertions(+), 28 deletions(-)
diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index b4db3f4..0145625 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -12,6 +12,39 @@
bool srcline_full_filename;
+static const char *dso_name_get(struct dso *dso)
+{
+ const char *dso_name;
+
+ if (dso->symsrc_filename)
+ dso_name = dso->symsrc_filename;
+ else
+ dso_name = dso->long_name;
+
+ if (dso_name[0] == '[')
+ return NULL;
+
+ if (!strncmp(dso_name, "/tmp/perf-", 10))
+ return NULL;
+
+ return dso_name;
+}
+
+static int ilist_apend(char *filename, int line_nr, struct inline_node *node)
+{
+ struct inline_list *ilist;
+
+ ilist = zalloc(sizeof(*ilist));
+ if (ilist == NULL)
+ return -1;
+
+ ilist->filename = filename;
+ ilist->line_nr = line_nr;
+ list_add_tail(&ilist->list, &node->val);
+
+ return 0;
+}
+
#ifdef HAVE_LIBBFD_SUPPORT
/*
@@ -153,7 +186,7 @@ static void addr2line_cleanup(struct a2l_data *a2l)
static int addr2line(const char *dso_name, u64 addr,
char **file, unsigned int *line, struct dso *dso,
- bool unwind_inlines)
+ bool unwind_inlines, struct inline_node *node)
{
int ret = 0;
struct a2l_data *a2l = dso->a2l;
@@ -178,8 +211,14 @@ static int addr2line(const char *dso_name, u64 addr,
while (bfd_find_inliner_info(a2l->abfd, &a2l->filename,
&a2l->funcname, &a2l->line) &&
- cnt++ < MAX_INLINE_NEST)
- ;
+ cnt++ < MAX_INLINE_NEST) {
+
+ if (node != NULL) {
+ if (ilist_apend(strdup(a2l->filename),
+ a2l->line, node) != 0)
+ return 0;
+ }
+ }
}
if (a2l->found && a2l->filename) {
@@ -205,18 +244,68 @@ void dso__free_a2l(struct dso *dso)
dso->a2l = NULL;
}
+static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
+ struct dso *dso)
+{
+ char *file = NULL;
+ unsigned int line = 0;
+ struct inline_node *node;
+
+ node = zalloc(sizeof(*node));
+ if (node == NULL) {
+ perror("not enough memory for the inline node");
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&node->val);
+ node->addr = addr;
+
+ if (!addr2line(dso_name, addr, &file, &line, dso, TRUE, node)) {
+ free_inline_node(node);
+ return NULL;
+ }
+
+ if (list_empty(&node->val)) {
+ free_inline_node(node);
+ return NULL;
+ }
+
+ return node;
+}
+
#else /* HAVE_LIBBFD_SUPPORT */
+static int filename_split(const char *dso_name, char *filename,
+ unsigned int *line_nr)
+{
+ char *sep;
+
+ sep = strchr(filename, '\n');
+ if (sep)
+ *sep = '\0';
+
+ if (!strcmp(filename, "??:0"))
+ return -1;
+
+ sep = strchr(filename, ':');
+ if (sep) {
+ *sep++ = '\0';
+ *line_nr = strtoul(sep, NULL, 0);
+ }
+
+ return 0;
+}
+
static int addr2line(const char *dso_name, u64 addr,
char **file, unsigned int *line_nr,
struct dso *dso __maybe_unused,
- bool unwind_inlines __maybe_unused)
+ bool unwind_inlines __maybe_unused,
+ struct inline_node *node __maybe_unused)
{
FILE *fp;
char cmd[PATH_MAX];
char *filename = NULL;
size_t len;
- char *sep;
int ret = 0;
scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64,
@@ -233,23 +322,14 @@ static int addr2line(const char *dso_name, u64 addr,
goto out;
}
- sep = strchr(filename, '\n');
- if (sep)
- *sep = '\0';
-
- if (!strcmp(filename, "??:0")) {
- pr_debug("no debugging info in %s\n", dso_name);
+ if (filename_split(dso_name, filename, line_nr) != 0) {
free(filename);
goto out;
}
- sep = strchr(filename, ':');
- if (sep) {
- *sep++ = '\0';
- *file = filename;
- *line_nr = strtoul(sep, NULL, 0);
- ret = 1;
- }
+ *file = filename;
+ ret = 1;
+
out:
pclose(fp);
return ret;
@@ -259,6 +339,57 @@ void dso__free_a2l(struct dso *dso __maybe_unused)
{
}
+static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
+ struct dso *dso __maybe_unused)
+{
+ FILE *fp;
+ char cmd[PATH_MAX];
+ struct inline_node *node;
+ char *filename = NULL;
+ size_t len;
+ unsigned int line_nr = 0;
+
+ scnprintf(cmd, sizeof(cmd), "addr2line -e %s -i %016"PRIx64,
+ dso_name, addr);
+
+ fp = popen(cmd, "r");
+ if (fp == NULL) {
+ pr_warn("popen failed for %s\n", dso_name);
+ return NULL;
+ }
+
+ node = zalloc(sizeof(*node));
+ if (node == NULL) {
+ perror("not enough memory for the inline node");
+ goto out;
+ }
+
+ INIT_LIST_HEAD(&node->val);
+ node->addr = addr;
+
+ while (getline(&filename, &len, fp) != -1) {
+ if (filename_split(dso_name, filename, &line_nr) != 0) {
+ free(filename);
+ goto out;
+ }
+
+ if (ilist_apend(filename, line_nr, node) != 0)
+ goto out;
+
+ filename = NULL;
+ }
+
+out:
+ pclose(fp);
+
+ if (list_empty(&node->val)) {
+ free_inline_node(node);
+ return NULL;
+ }
+
+ return node;
+}
+
#endif /* HAVE_LIBBFD_SUPPORT */
/*
@@ -278,18 +409,11 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
if (!dso->has_srcline)
goto out;
- if (dso->symsrc_filename)
- dso_name = dso->symsrc_filename;
- else
- dso_name = dso->long_name;
-
- if (dso_name[0] == '[')
- goto out;
-
- if (!strncmp(dso_name, "/tmp/perf-", 10))
+ dso_name = dso_name_get(dso);
+ if (dso_name == NULL)
goto out;
- if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines))
+ if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines, NULL))
goto out;
if (asprintf(&srcline, "%s:%u",
@@ -329,3 +453,29 @@ char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
{
return __get_srcline(dso, addr, sym, show_sym, false);
}
+
+struct inline_node *get_inline_node(struct dso *dso, u64 addr)
+{
+ const char *dso_name;
+
+ dso_name = dso_name_get(dso);
+ if (dso_name == NULL)
+ return NULL;
+
+ return addr2inlines(dso_name, addr, dso);
+}
+
+void free_inline_node(struct inline_node *node)
+{
+ struct inline_list *ilist, *tmp;
+
+ list_for_each_entry_safe(ilist, tmp, &node->val, list) {
+ list_del(&ilist->list);
+ if (ilist->filename != NULL)
+ free(ilist->filename);
+
+ free(ilist);
+ }
+
+ free(node);
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 79662d6..febe8d7 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -78,6 +78,7 @@
#include <termios.h>
#include <linux/bitops.h>
#include <termios.h>
+#include <linux/list.h>
#include "strlist.h"
extern const char *graph_line;
@@ -365,4 +366,18 @@ int is_printable_array(char *p, unsigned int len);
int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz);
+struct inline_list {
+ char *filename;
+ unsigned int line_nr;
+ struct list_head list;
+};
+
+struct inline_node {
+ u64 addr;
+ struct list_head val;
+};
+
+struct inline_node *get_inline_node(struct dso *dso, u64 addr);
+void free_inline_node(struct inline_node *node);
+
#endif /* GIT_COMPAT_UTIL_H */
--
2.7.4
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