[PATCH -tip 02/10] perf probe: Use wrapper functions

From: Masami Hiramatsu
Date: Tue Mar 16 2010 - 17:57:32 EST

Use wrapperf functions as much as possible, to check out of memory
in perf probe.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---

tools/perf/builtin-probe.c | 4 +--
tools/perf/util/probe-event.c | 46 +++++++++++++++-------------------------
tools/perf/util/probe-finder.c | 14 +++++-------
3 files changed, 24 insertions(+), 40 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 152d6c9..b6afe7b 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -87,9 +87,7 @@ static void parse_probe_event_argv(int argc, const char **argv)
len = 0;
for (i = 0; i < argc; i++)
len += strlen(argv[i]) + 1;
- buf = zalloc(len + 1);
- if (!buf)
- die("Failed to allocate memory for binding arguments.");
+ buf = xzalloc(len + 1);
len = 0;
for (i = 0; i < argc; i++)
len += sprintf(&buf[len], "%s ", argv[i]);
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 7c004b6..88a3b6d 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -33,6 +33,7 @@
#include <limits.h>

#undef _GNU_SOURCE
+#include "util.h"
#include "event.h"
#include "string.h"
#include "strlist.h"
@@ -90,9 +91,9 @@ void parse_line_range_desc(const char *arg, struct line_range *lr)
if (*tmp != '\0')
semantic_error("Tailing with invalid character '%d'.",
*tmp);
- tmp = strndup(arg, (ptr - arg));
+ tmp = xstrndup(arg, (ptr - arg));
} else
- tmp = strdup(arg);
+ tmp = xstrdup(arg);

if (strchr(tmp, '.'))
lr->file = tmp;
@@ -135,7 +136,7 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
if (!check_event_name(arg))
semantic_error("%s is bad for event name -it must "
"follow C symbol-naming rule.", arg);
- pp->event = strdup(arg);
+ pp->event = xstrdup(arg);
arg = tmp;
}

@@ -147,17 +148,16 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)

/* Check arg is function or file and copy it */
if (strchr(arg, '.')) /* File */
- pp->file = strdup(arg);
+ pp->file = xstrdup(arg);
else /* Function */
- pp->function = strdup(arg);
- DIE_IF(pp->file == NULL && pp->function == NULL);
+ pp->function = xstrdup(arg);

/* Parse other options */
while (ptr) {
arg = ptr;
c = nc;
if (c == ';') { /* Lazy pattern must be the last part */
- pp->lazy_line = strdup(arg);
+ pp->lazy_line = xstrdup(arg);
break;
}
ptr = strpbrk(arg, ";:+@%");
@@ -181,8 +181,7 @@ static void parse_perf_probe_probepoint(char *arg, struct probe_point *pp)
case '@': /* File name */
if (pp->file)
semantic_error("SRC@SRC is not allowed.");
- pp->file = strdup(arg);
- DIE_IF(pp->file == NULL);
+ pp->file = xstrdup(arg);
break;
case '%': /* Probe places */
if (strcmp(arg, "return") == 0) {
@@ -247,11 +246,9 @@ void parse_perf_probe_event(const char *str, struct probe_point *pp,

/* Copy arguments and ensure return probe has no C argument */
pp->nr_args = argc - 1;
- pp->args = zalloc(sizeof(char *) * pp->nr_args);
+ pp->args = xzalloc(sizeof(char *) * pp->nr_args);
for (i = 0; i < pp->nr_args; i++) {
- pp->args[i] = strdup(argv[i + 1]);
- if (!pp->args[i])
- die("Failed to copy argument.");
+ pp->args[i] = xstrdup(argv[i + 1]);
if (is_c_varname(pp->args[i])) {
if (pp->retprobe)
semantic_error("You can't specify local"
@@ -299,14 +296,12 @@ void parse_trace_kprobe_event(const char *str, struct probe_point *pp)
pp->file = NULL;

pp->nr_args = argc - 2;
- pp->args = zalloc(sizeof(char *) * pp->nr_args);
+ pp->args = xzalloc(sizeof(char *) * pp->nr_args);
for (i = 0; i < pp->nr_args; i++) {
p = strchr(argv[i + 2], '=');
if (p) /* We don't need which register is assigned. */
*p = '\0';
- pp->args[i] = strdup(argv[i + 2]);
- if (!pp->args[i])
- die("Failed to copy argument.");
+ pp->args[i] = xstrdup(argv[i + 2]);
}

argv_free(argv);
@@ -319,10 +314,8 @@ int synthesize_perf_probe_point(struct probe_point *pp)
char offs[64] = "", line[64] = "";
int ret;

- pp->probes[0] = buf = zalloc(MAX_CMDLEN);
+ pp->probes[0] = buf = xzalloc(MAX_CMDLEN);
pp->found = 1;
- if (!buf)
- die("Failed to allocate memory by zalloc.");
if (pp->offset) {
ret = e_snprintf(offs, 64, "+%d", pp->offset);
if (ret <= 0)
@@ -380,9 +373,7 @@ int synthesize_trace_kprobe_event(struct probe_point *pp)
char *buf;
int i, len, ret;

- pp->probes[0] = buf = zalloc(MAX_CMDLEN);
- if (!buf)
- die("Failed to allocate memory by zalloc.");
+ pp->probes[0] = buf = xzalloc(MAX_CMDLEN);
ret = e_snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
if (ret <= 0)
goto error;
@@ -612,10 +603,9 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
for (j = 0; j < nr_probes; j++) {
pp = probes + j;
if (!pp->event)
- pp->event = strdup(pp->function);
+ pp->event = xstrdup(pp->function);
if (!pp->group)
- pp->group = strdup(PERFPROBE_GROUP);
- DIE_IF(!pp->event || !pp->group);
+ pp->group = xstrdup(PERFPROBE_GROUP);
/* If force_add is true, suffix search is allowed */
allow_suffix = force_add;
for (i = 0; i < pp->found; i++) {
@@ -709,9 +699,7 @@ void del_trace_kprobe_events(struct strlist *dellist)
namelist = get_perf_event_names(fd, true);

strlist__for_each(ent, dellist) {
- str = strdup(ent->s);
- if (!str)
- die("Failed to copy event.");
+ str = xstrdup(ent->s);
pr_debug("Parsing: %s\n", str);
p = strchr(str, ':');
if (p) {
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index c171a24..e887bb6 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -125,8 +125,7 @@ static void line_list__add_line(struct list_head *head, unsigned int line)
p = head;
found:
pr_debug("line list: add a line %u\n", line);
- ln = zalloc(sizeof(struct line_node));
- DIE_IF(ln == NULL);
+ ln = xzalloc(sizeof(struct line_node));
ln->line = line;
INIT_LIST_HEAD(&ln->list);
list_add(&ln->list, p);
@@ -416,7 +415,7 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
(unsigned long)(pf->addr - eaddr));
/* Copy the function name if possible */
if (!pp->function) {
- pp->function = strdup(name);
+ pp->function = xstrdup(name);
pp->offset = (size_t)(pf->addr - eaddr);
}
} else {
@@ -425,7 +424,7 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
(uintmax_t)pf->addr);
if (!pp->function) {
/* TODO: Use _stext */
- pp->function = strdup("");
+ pp->function = xstrdup("");
pp->offset = (size_t)pf->addr;
}
}
@@ -456,7 +455,7 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
if (pp->found == MAX_PROBES)
die("Too many( > %d) probe point found.\n", MAX_PROBES);

- pp->probes[pp->found] = strdup(tmp);
+ pp->probes[pp->found] = xstrdup(tmp);
pp->found++;
}

@@ -506,8 +505,7 @@ static int find_lazy_match_lines(struct list_head *head,
if (fd < 0)
die("failed to open %s", fname);
DIE_IF(fstat(fd, &st) < 0);
- fbuf = malloc(st.st_size + 2);
- DIE_IF(fbuf == NULL);
+ fbuf = xmalloc(st.st_size + 2);
DIE_IF(read(fd, fbuf, st.st_size) < 0);
close(fd);
fbuf[st.st_size] = '\n'; /* Dummy line */
@@ -727,7 +725,7 @@ static void find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)

/* Copy real path */
if (!lf->lr->path)
- lf->lr->path = strdup(src);
+ lf->lr->path = xstrdup(src);
line_list__add_line(&lf->lr->line_list, (unsigned int)lineno);
}
/* Update status */


--
Masami Hiramatsu
e-mail: mhiramat@xxxxxxxxxx
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