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perf srcline: Simplify addr2line subprocess

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Don't wrap stdin and stdout of subprocess with streams, use the api/io
library for buffering.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tom Rix <trix@redhat.com>
Cc: llvm@lists.linux.dev
Link: https://lore.kernel.org/r/20230403184033.1836023-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-04-03 11:40:31 -07:00 committed by Arnaldo Carvalho de Melo
parent c9dc580c43
commit b3801e7912
1 changed files with 38 additions and 65 deletions
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103
tools/perf/util/srcline.c
View File

@ -10,6 +10,8 @@
#include <linux/string.h>
#include <linux/zalloc.h>
#include <api/io.h>
#include "util/dso.h"
#include "util/debug.h"
#include "util/callchain.h"
@ -366,12 +368,6 @@ void dso__free_a2l(struct dso *dso)
#else /* HAVE_LIBBFD_SUPPORT */
struct a2l_subprocess {
struct child_process addr2line;
FILE *to_child;
FILE *from_child;
};
static int filename_split(char *filename, unsigned int *line_nr)
{
char *sep;
@ -393,28 +389,18 @@ static int filename_split(char *filename, unsigned int *line_nr)
return 0;
}
static void addr2line_subprocess_cleanup(struct a2l_subprocess *a2l)
static void addr2line_subprocess_cleanup(struct child_process *a2l)
{
if (a2l->addr2line.pid != -1) {
kill(a2l->addr2line.pid, SIGKILL);
finish_command(&a2l->addr2line); /* ignore result, we don't care */
a2l->addr2line.pid = -1;
}
if (a2l->to_child != NULL) {
fclose(a2l->to_child);
a2l->to_child = NULL;
}
if (a2l->from_child != NULL) {
fclose(a2l->from_child);
a2l->from_child = NULL;
if (a2l->pid != -1) {
kill(a2l->pid, SIGKILL);
finish_command(a2l); /* ignore result, we don't care */
a2l->pid = -1;
}
free(a2l);
}
static struct a2l_subprocess *addr2line_subprocess_init(const char *addr2line_path,
static struct child_process *addr2line_subprocess_init(const char *addr2line_path,
const char *binary_path)
{
const char *argv[] = {
@ -422,54 +408,34 @@ static struct a2l_subprocess *addr2line_subprocess_init(const char *addr2line_pa
"-e", binary_path,
"-i", "-f", NULL
};
struct a2l_subprocess *a2l = zalloc(sizeof(*a2l));
struct child_process *a2l = zalloc(sizeof(*a2l));
int start_command_status = 0;
if (a2l == NULL)
goto out;
if (a2l == NULL) {
pr_err("Failed to allocate memory for addr2line");
return NULL;
}
a2l->to_child = NULL;
a2l->from_child = NULL;
a2l->pid = -1;
a2l->in = -1;
a2l->out = -1;
a2l->no_stderr = 1;
a2l->addr2line.pid = -1;
a2l->addr2line.in = -1;
a2l->addr2line.out = -1;
a2l->addr2line.no_stderr = 1;
a2l->addr2line.argv = argv;
start_command_status = start_command(&a2l->addr2line);
a2l->addr2line.argv = NULL; /* it's not used after start_command; avoid dangling pointers */
a2l->argv = argv;
start_command_status = start_command(a2l);
a2l->argv = NULL; /* it's not used after start_command; avoid dangling pointers */
if (start_command_status != 0) {
pr_warning("could not start addr2line (%s) for %s: start_command return code %d\n",
addr2line_path, binary_path, start_command_status);
goto out;
}
a2l->to_child = fdopen(a2l->addr2line.in, "w");
if (a2l->to_child == NULL) {
pr_warning("could not open write-stream to addr2line (%s) of %s\n",
addr2line_path, binary_path);
goto out;
}
a2l->from_child = fdopen(a2l->addr2line.out, "r");
if (a2l->from_child == NULL) {
pr_warning("could not open read-stream from addr2line (%s) of %s\n",
addr2line_path, binary_path);
goto out;
addr2line_subprocess_cleanup(a2l);
return NULL;
}
return a2l;
out:
if (a2l)
addr2line_subprocess_cleanup(a2l);
return NULL;
}
static int read_addr2line_record(struct a2l_subprocess *a2l,
static int read_addr2line_record(struct io *io,
char **function,
char **filename,
unsigned int *line_nr)
@ -494,7 +460,7 @@ static int read_addr2line_record(struct a2l_subprocess *a2l,
if (line_nr != NULL)
*line_nr = 0;
if (getline(&line, &line_len, a2l->from_child) < 0 || !line_len)
if (io__getline(io, &line, &line_len) < 0 || !line_len)
goto error;
if (function != NULL)
*function = strdup(strim(line));
@ -502,7 +468,7 @@ static int read_addr2line_record(struct a2l_subprocess *a2l,
zfree(&line);
line_len = 0;
if (getline(&line, &line_len, a2l->from_child) < 0 || !line_len)
if (io__getline(io, &line, &line_len) < 0 || !line_len)
goto error;
if (filename_split(line, line_nr == NULL ? &dummy_line_nr : line_nr) == 0) {
@ -546,13 +512,17 @@ static int addr2line(const char *dso_name, u64 addr,
struct inline_node *node,
struct symbol *sym __maybe_unused)
{
struct a2l_subprocess *a2l = dso->a2l;
struct child_process *a2l = dso->a2l;
char *record_function = NULL;
char *record_filename = NULL;
unsigned int record_line_nr = 0;
int record_status = -1;
int ret = 0;
size_t inline_count = 0;
int len;
char buf[128];
ssize_t written;
struct io io;
if (!a2l) {
if (!filename__has_section(dso_name, ".debug_line"))
@ -578,13 +548,16 @@ static int addr2line(const char *dso_name, u64 addr,
* though, because it may be genuinely unknown, in which case we'll get two sets of
* "??"/"??:0" lines.
*/
if (fprintf(a2l->to_child, "%016"PRIx64"\n,\n", addr) < 0 || fflush(a2l->to_child) != 0) {
len = snprintf(buf, sizeof(buf), "%016"PRIx64"\n,\n", addr);
written = len > 0 ? write(a2l->in, buf, len) : -1;
if (written != len) {
if (!symbol_conf.disable_add2line_warn)
pr_warning("%s %s: could not send request\n", __func__, dso_name);
goto out;
}
io__init(&io, a2l->out, buf, sizeof(buf));
switch (read_addr2line_record(a2l, &record_function, &record_filename, &record_line_nr)) {
switch (read_addr2line_record(&io, &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);
@ -594,7 +567,7 @@ 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(a2l, NULL, NULL, NULL)) {
switch (read_addr2line_record(&io, NULL, NULL, NULL)) {
case -1:
if (!symbol_conf.disable_add2line_warn)
pr_warning("%s %s: could not read delimiter record\n",
@ -632,7 +605,7 @@ 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(a2l,
while ((record_status = read_addr2line_record(&io,
&record_function,
&record_filename,
&record_line_nr)) == 1) {
@ -656,7 +629,7 @@ out:
void dso__free_a2l(struct dso *dso)
{
struct a2l_subprocess *a2l = dso->a2l;
struct child_process *a2l = dso->a2l;
if (!a2l)
return;