[PATCH perf/core v3 0/8] perf tools: Update strbuf to remove xrealloc

[PATCH perf/core v3 0/8] perf tools: Update strbuf to remove xrealloc

[Masami Hiramatsu]

Hi Arnaldo, 

Here is the 3rd version of the strbuf update. I've fixed it
according to your suggestion :)

 - [1/8] Use realloc instead of malloc/memcpy/free (Thanks Arnaldo!)
 - [2/8] Cleanup code path according to Arnaldo's review.
 - [5/8] Avoid using STRBUF_INIT and return error directly before
        initalizing strbuf.

This patch series does refactoring strbuf and xrealloc related code
to remove xrealloc since it can call die() to exit immediately when
it hits any error. Instead of that, it should return error code to
the caller so that the caller can handle its error.

Thus, at first, this changes the strbuf APIs to return error code
instead of die() immediately. And then changing API callers according
to the following rules.
 - Check the return value of strbuf APIs and handle errors and,
   - If the caller returns an error code (errno), it returns
     the return value of strbuf APIs.
   - If the caller just return -1 or NULl in error case, it also
     returns -1 or NULL in case of strbuf error. 
   - If the caller can call die() directly, it also call die()
     in case of strbuf error.
 - Error checking patches are splitted for each subcommand, since
   it will help review.

This also removes xrealloc and ALLOC_GROW from libperf, so that no
one use it anymore.

Thank you,

---

Masami Hiramatsu (8):
      perf: Rewrite strbuf not to die
      perf probe: Check the return value of strbuf APIs
      perf help: Make check_emacsclient_version to check strbuf APIs
      perf: Make alias handler to check return value of strbuf
      perf header: Make topology checkers to check return value of strbuf
      perf pmu: Make pmu_formats_string to check return value of strbuf
      perf help: Do not use ALLOC_GROW in add_cmd_list
      perf tools: Remove xrealloc and ALLOC_GROW


 tools/perf/builtin-help.c          |   18 +++--
 tools/perf/perf.c                  |    8 +-
 tools/perf/util/Build              |    1 
 tools/perf/util/cache.h            |   19 -----
 tools/perf/util/dwarf-aux.c        |   52 ++++++-------
 tools/perf/util/header.c           |   31 +++++---
 tools/perf/util/help-unknown-cmd.c |   30 ++++++--
 tools/perf/util/pmu.c              |   10 +--
 tools/perf/util/probe-event.c      |  143 ++++++++++++++++++++++--------------
 tools/perf/util/probe-finder.c     |   30 +++++---
 tools/perf/util/quote.c            |   36 +++++----
 tools/perf/util/quote.h            |    2 -
 tools/perf/util/strbuf.c           |   93 +++++++++++++++++------
 tools/perf/util/strbuf.h           |   25 ++++--
 tools/perf/util/util.h             |    6 --
 tools/perf/util/wrapper.c          |   29 -------
 16 files changed, 293 insertions(+), 240 deletions(-)
 delete mode 100644 tools/perf/util/wrapper.c

--
Masami Hiramatsu

[PATCH perf/core v3 1/8] perf: Rewrite strbuf not to die

[Masami Hiramatsu]

Rewrite strbuf implementation not to use die() nor xrealloc().
Instead of die, now most of the API returns error code or 0 if
succeeded.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 Changes in v3:
  - Use realloc instead of malloc/memcpy/free (Thanks Arnaldo!)
---
 tools/perf/util/strbuf.c |   93 +++++++++++++++++++++++++++++++++-------------
 tools/perf/util/strbuf.h |   25 +++++++-----
 2 files changed, 82 insertions(+), 36 deletions(-)

diff --git a/tools/perf/util/strbuf.c b/tools/perf/util/strbuf.c
index 8fb7329..f95f682 100644
--- a/tools/perf/util/strbuf.c
+++ b/tools/perf/util/strbuf.c
@@ -1,3 +1,4 @@
+#include "debug.h"
 #include "cache.h"
 #include <linux/kernel.h>
 
@@ -17,12 +18,13 @@ int prefixcmp(const char *str, const char *prefix)
  */
 char strbuf_slopbuf[1];
 
-void strbuf_init(struct strbuf *sb, ssize_t hint)
+int strbuf_init(struct strbuf *sb, ssize_t hint)
 {
 	sb->alloc = sb->len = 0;
 	sb->buf = strbuf_slopbuf;
 	if (hint)
-		strbuf_grow(sb, hint);
+		return strbuf_grow(sb, hint);
+	return 0;
 }
 
 void strbuf_release(struct strbuf *sb)
@@ -42,67 +44,104 @@ char *strbuf_detach(struct strbuf *sb, size_t *sz)
 	return res;
 }
 
-void strbuf_grow(struct strbuf *sb, size_t extra)
+int strbuf_grow(struct strbuf *sb, size_t extra)
 {
-	if (sb->len + extra + 1 <= sb->len)
-		die("you want to use way too much memory");
-	if (!sb->alloc)
-		sb->buf = NULL;
-	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
+	char *buf;
+	size_t nr = sb->len + extra + 1;
+
+	if (nr < sb->alloc)
+		return 0;
+
+	if (nr <= sb->len)
+		return -E2BIG;
+
+	if (alloc_nr(sb->alloc) > nr)
+		nr = alloc_nr(sb->alloc);
+
+	/*
+	 * Note that sb->buf == strbuf_slopbuf if sb->alloc == 0, and it is
+	 * a static variable. Thus we have to avoid passing it to realloc.
+	 */
+	buf = realloc(sb->alloc ? sb->buf : NULL, nr * sizeof(*buf));
+	if (!buf)
+		return -ENOMEM;
+
+	sb->buf = buf;
+	sb->alloc = nr;
+	return 0;
 }
 
-void strbuf_addch(struct strbuf *sb, int c)
+int strbuf_addch(struct strbuf *sb, int c)
 {
-	strbuf_grow(sb, 1);
+	int ret = strbuf_grow(sb, 1);
+	if (ret)
+		return ret;
+
 	sb->buf[sb->len++] = c;
 	sb->buf[sb->len] = '\0';
+	return 0;
 }
 
-void strbuf_add(struct strbuf *sb, const void *data, size_t len)
+int strbuf_add(struct strbuf *sb, const void *data, size_t len)
 {
-	strbuf_grow(sb, len);
+	int ret = strbuf_grow(sb, len);
+	if (ret)
+		return ret;
+
 	memcpy(sb->buf + sb->len, data, len);
-	strbuf_setlen(sb, sb->len + len);
+	return strbuf_setlen(sb, sb->len + len);
 }
 
-static void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
+static int strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
 {
-	int len;
+	int len, ret;
 	va_list ap_saved;
 
-	if (!strbuf_avail(sb))
-		strbuf_grow(sb, 64);
+	if (!strbuf_avail(sb)) {
+		ret = strbuf_grow(sb, 64);
+		if (ret)
+			return ret;
+	}
 
 	va_copy(ap_saved, ap);
 	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 	if (len < 0)
-		die("your vsnprintf is broken");
+		return len;
 	if (len > strbuf_avail(sb)) {
-		strbuf_grow(sb, len);
+		ret = strbuf_grow(sb, len);
+		if (ret)
+			return ret;
 		len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved);
 		va_end(ap_saved);
 		if (len > strbuf_avail(sb)) {
-			die("this should not happen, your vsnprintf is broken");
+			pr_debug("this should not happen, your vsnprintf is broken");
+			return -EINVAL;
 		}
 	}
-	strbuf_setlen(sb, sb->len + len);
+	return strbuf_setlen(sb, sb->len + len);
 }
 
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+int strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 {
 	va_list ap;
+	int ret;
 
 	va_start(ap, fmt);
-	strbuf_addv(sb, fmt, ap);
+	ret = strbuf_addv(sb, fmt, ap);
 	va_end(ap);
+	return ret;
 }
 
 ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
 {
 	size_t oldlen = sb->len;
 	size_t oldalloc = sb->alloc;
+	int ret;
+
+	ret = strbuf_grow(sb, hint ? hint : 8192);
+	if (ret)
+		return ret;
 
-	strbuf_grow(sb, hint ? hint : 8192);
 	for (;;) {
 		ssize_t cnt;
 
@@ -112,12 +151,14 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
 				strbuf_release(sb);
 			else
 				strbuf_setlen(sb, oldlen);
-			return -1;
+			return cnt;
 		}
 		if (!cnt)
 			break;
 		sb->len += cnt;
-		strbuf_grow(sb, 8192);
+		ret = strbuf_grow(sb, 8192);
+		if (ret)
+			return ret;
 	}
 
 	sb->buf[sb->len] = '\0';
diff --git a/tools/perf/util/strbuf.h b/tools/perf/util/strbuf.h
index ab9be0fb..54b4092 100644
--- a/tools/perf/util/strbuf.h
+++ b/tools/perf/util/strbuf.h
@@ -51,7 +51,7 @@ struct strbuf {
 #define STRBUF_INIT  { 0, 0, strbuf_slopbuf }
 
 /*----- strbuf life cycle -----*/
-void strbuf_init(struct strbuf *buf, ssize_t hint);
+int strbuf_init(struct strbuf *buf, ssize_t hint);
 void strbuf_release(struct strbuf *buf);
 char *strbuf_detach(struct strbuf *buf, size_t *);
 
@@ -60,26 +60,31 @@ static inline ssize_t strbuf_avail(const struct strbuf *sb) {
 	return sb->alloc ? sb->alloc - sb->len - 1 : 0;
 }
 
-void strbuf_grow(struct strbuf *buf, size_t);
+int strbuf_grow(struct strbuf *buf, size_t);
 
-static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
-	if (!sb->alloc)
-		strbuf_grow(sb, 0);
+static inline int strbuf_setlen(struct strbuf *sb, size_t len) {
+	int ret;
+	if (!sb->alloc) {
+		ret = strbuf_grow(sb, 0);
+		if (ret)
+			return ret;
+	}
 	assert(len < sb->alloc);
 	sb->len = len;
 	sb->buf[len] = '\0';
+	return 0;
 }
 
 /*----- add data in your buffer -----*/
-void strbuf_addch(struct strbuf *sb, int c);
+int strbuf_addch(struct strbuf *sb, int c);
 
-void strbuf_add(struct strbuf *buf, const void *, size_t);
-static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
-	strbuf_add(sb, s, strlen(s));
+int strbuf_add(struct strbuf *buf, const void *, size_t);
+static inline int strbuf_addstr(struct strbuf *sb, const char *s) {
+	return strbuf_add(sb, s, strlen(s));
 }
 
 __attribute__((format(printf,2,3)))
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
+int strbuf_addf(struct strbuf *sb, const char *fmt, ...);
 
 /* XXX: if read fails, any partial read is undone */
 ssize_t strbuf_read(struct strbuf *, int fd, ssize_t hint);

[PATCH perf/core v3 2/8] perf probe: Check the return value of strbuf APIs

[Masami Hiramatsu]

Check the return value of strbuf APIs in perf-probe
related code, so that it can handle errors in strbuf.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
  Changes in v3:
   - Cleanup code path according to Arnaldo's review.
  Changes in V2:
   - Rebased on the latest perf/core.
---
 tools/perf/util/dwarf-aux.c    |   52 +++++++--------
 tools/perf/util/probe-event.c  |  143 ++++++++++++++++++++++++----------------
 tools/perf/util/probe-finder.c |   30 +++++---
 3 files changed, 128 insertions(+), 97 deletions(-)

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index aea189b..a347b19 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -915,8 +915,7 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
 		tmp = "*";
 	else if (tag == DW_TAG_subroutine_type) {
 		/* Function pointer */
-		strbuf_add(buf, "(function_type)", 15);
-		return 0;
+		return strbuf_add(buf, "(function_type)", 15);
 	} else {
 		if (!dwarf_diename(&type))
 			return -ENOENT;
@@ -927,14 +926,10 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
 		else if (tag == DW_TAG_enumeration_type)
 			tmp = "enum ";
 		/* Write a base name */
-		strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
-		return 0;
+		return strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
 	}
 	ret = die_get_typename(&type, buf);
-	if (ret == 0)
-		strbuf_addstr(buf, tmp);
-
-	return ret;
+	return ret ? ret : strbuf_addstr(buf, tmp);
 }
 
 /**
@@ -951,12 +946,10 @@ int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
 	ret = die_get_typename(vr_die, buf);
 	if (ret < 0) {
 		pr_debug("Failed to get type, make it unknown.\n");
-		strbuf_add(buf, " (unknown_type)", 14);
+		ret = strbuf_add(buf, " (unknown_type)", 14);
 	}
 
-	strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
-
-	return 0;
+	return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
 }
 
 #ifdef HAVE_DWARF_GETLOCATIONS
@@ -999,22 +992,24 @@ static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
 	}
 
 	while ((offset = dwarf_ranges(&scopes[1], offset, &base,
-				&start, &end)) > 0) {
+					&start, &end)) > 0) {
 		start -= entry;
 		end -= entry;
 
 		if (first) {
-			strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
-				name, start, end);
+			ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
+					  name, start, end);
 			first = false;
 		} else {
-			strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
-				start, end);
+			ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
+					  start, end);
 		}
+		if (ret < 0)
+			goto out;
 	}
 
 	if (!first)
-		strbuf_add(buf, "]>", 2);
+		ret = strbuf_add(buf, "]>", 2);
 
 out:
 	free(scopes);
@@ -1054,31 +1049,32 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
 	if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
 		return -EINVAL;
 
-	while ((offset = dwarf_getlocations(
-				&attr, offset, &base,
-				&start, &end, &op, &nops)) > 0) {
+	while ((offset = dwarf_getlocations(&attr, offset, &base,
+					&start, &end, &op, &nops)) > 0) {
 		if (start == 0) {
 			/* Single Location Descriptions */
 			ret = die_get_var_innermost_scope(sp_die, vr_die, buf);
-			return ret;
+			goto out;
 		}
 
 		/* Location Lists */
 		start -= entry;
 		end -= entry;
 		if (first) {
-			strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
-				name, start, end);
+			ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
+					  name, start, end);
 			first = false;
 		} else {
-			strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
-				start, end);
+			ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
+					  start, end);
 		}
+		if (ret < 0)
+			goto out;
 	}
 
 	if (!first)
-		strbuf_add(buf, "]>", 2);
-
+		ret = strbuf_add(buf, "]>", 2);
+out:
 	return ret;
 }
 #else
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index c82c625..74401a2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1677,28 +1677,37 @@ char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
 {
 	struct perf_probe_arg_field *field = pa->field;
 	struct strbuf buf;
-	char *ret;
+	char *ret = NULL;
+	int err;
+
+	if (strbuf_init(&buf, 64) < 0)
+		return NULL;
 
-	strbuf_init(&buf, 64);
 	if (pa->name && pa->var)
-		strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
+		err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
 	else
-		strbuf_addstr(&buf, pa->name ?: pa->var);
+		err = strbuf_addstr(&buf, pa->name ?: pa->var);
+	if (err)
+		goto out;
 
 	while (field) {
 		if (field->name[0] == '[')
-			strbuf_addstr(&buf, field->name);
+			err = strbuf_addstr(&buf, field->name);
 		else
-			strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
-				    field->name);
+			err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
+					  field->name);
 		field = field->next;
+		if (err)
+			goto out;
 	}
 
 	if (pa->type)
-		strbuf_addf(&buf, ":%s", pa->type);
+		if (strbuf_addf(&buf, ":%s", pa->type) < 0)
+			goto out;
 
 	ret = strbuf_detach(&buf, NULL);
-
+out:
+	strbuf_release(&buf);
 	return ret;
 }
 
@@ -1706,18 +1715,23 @@ char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 {
 	struct strbuf buf;
-	char *tmp;
-	int len;
+	char *tmp, *ret = NULL;
+	int len, err = 0;
+
+	if (strbuf_init(&buf, 64) < 0)
+		return NULL;
 
-	strbuf_init(&buf, 64);
 	if (pp->function) {
-		strbuf_addstr(&buf, pp->function);
+		if (strbuf_addstr(&buf, pp->function) < 0)
+			goto out;
 		if (pp->offset)
-			strbuf_addf(&buf, "+%lu", pp->offset);
+			err = strbuf_addf(&buf, "+%lu", pp->offset);
 		else if (pp->line)
-			strbuf_addf(&buf, ":%d", pp->line);
+			err = strbuf_addf(&buf, ":%d", pp->line);
 		else if (pp->retprobe)
-			strbuf_addstr(&buf, "%return");
+			err = strbuf_addstr(&buf, "%return");
+		if (err)
+			goto out;
 	}
 	if (pp->file) {
 		tmp = pp->file;
@@ -1726,12 +1740,15 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 			tmp = strchr(pp->file + len - 30, '/');
 			tmp = tmp ? tmp + 1 : pp->file + len - 30;
 		}
-		strbuf_addf(&buf, "@%s", tmp);
-		if (!pp->function && pp->line)
-			strbuf_addf(&buf, ":%d", pp->line);
+		err = strbuf_addf(&buf, "@%s", tmp);
+		if (!err && !pp->function && pp->line)
+			err = strbuf_addf(&buf, ":%d", pp->line);
 	}
-
-	return strbuf_detach(&buf, NULL);
+	if (!err)
+		ret = strbuf_detach(&buf, NULL);
+out:
+	strbuf_release(&buf);
+	return ret;
 }
 
 #if 0
@@ -1762,28 +1779,30 @@ char *synthesize_perf_probe_command(struct perf_probe_event *pev)
 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
 					    struct strbuf *buf, int depth)
 {
+	int err;
 	if (ref->next) {
 		depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
 							 depth + 1);
 		if (depth < 0)
-			goto out;
+			return depth;
 	}
-	strbuf_addf(buf, "%+ld(", ref->offset);
-out:
-	return depth;
+	err = strbuf_addf(buf, "%+ld(", ref->offset);
+	return (err < 0) ? err : depth;
 }
 
 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
 				      struct strbuf *buf)
 {
 	struct probe_trace_arg_ref *ref = arg->ref;
-	int depth = 0;
+	int depth = 0, err;
 
 	/* Argument name or separator */
 	if (arg->name)
-		strbuf_addf(buf, " %s=", arg->name);
+		err = strbuf_addf(buf, " %s=", arg->name);
 	else
-		strbuf_addch(buf, ' ');
+		err = strbuf_addch(buf, ' ');
+	if (err)
+		return err;
 
 	/* Special case: @XXX */
 	if (arg->value[0] == '@' && arg->ref)
@@ -1798,18 +1817,19 @@ static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
 
 	/* Print argument value */
 	if (arg->value[0] == '@' && arg->ref)
-		strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
+		err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
 	else
-		strbuf_addstr(buf, arg->value);
+		err = strbuf_addstr(buf, arg->value);
 
 	/* Closing */
-	while (depth--)
-		strbuf_addch(buf, ')');
+	while (!err && depth--)
+		err = strbuf_addch(buf, ')');
+
 	/* Print argument type */
-	if (arg->type)
-		strbuf_addf(buf, ":%s", arg->type);
+	if (!err && arg->type)
+		err = strbuf_addf(buf, ":%s", arg->type);
 
-	return 0;
+	return err;
 }
 
 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
@@ -1817,15 +1837,18 @@ char *synthesize_probe_trace_command(struct probe_trace_event *tev)
 	struct probe_trace_point *tp = &tev->point;
 	struct strbuf buf;
 	char *ret = NULL;
-	int i;
+	int i, err;
 
 	/* Uprobes must have tp->module */
 	if (tev->uprobes && !tp->module)
 		return NULL;
 
-	strbuf_init(&buf, 32);
-	strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
-		    tev->group, tev->event);
+	if (strbuf_init(&buf, 32) < 0)
+		return NULL;
+
+	if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
+			tev->group, tev->event) < 0)
+		goto error;
 	/*
 	 * If tp->address == 0, then this point must be a
 	 * absolute address uprobe.
@@ -1839,14 +1862,16 @@ char *synthesize_probe_trace_command(struct probe_trace_event *tev)
 
 	/* Use the tp->address for uprobes */
 	if (tev->uprobes)
-		strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
+		err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
 	else if (!strncmp(tp->symbol, "0x", 2))
 		/* Absolute address. See try_to_find_absolute_address() */
-		strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
-			    tp->module ? ":" : "", tp->address);
+		err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
+				  tp->module ? ":" : "", tp->address);
 	else
-		strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
-			    tp->module ? ":" : "", tp->symbol, tp->offset);
+		err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
+				tp->module ? ":" : "", tp->symbol, tp->offset);
+	if (err)
+		goto error;
 
 	for (i = 0; i < tev->nargs; i++)
 		if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
@@ -1960,14 +1985,15 @@ static int convert_to_perf_probe_event(struct probe_trace_event *tev,
 		if (tev->args[i].name)
 			pev->args[i].name = strdup(tev->args[i].name);
 		else {
-			strbuf_init(&buf, 32);
+			if ((ret = strbuf_init(&buf, 32)) < 0)
+				goto error;
 			ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
 			pev->args[i].name = strbuf_detach(&buf, NULL);
 		}
 		if (pev->args[i].name == NULL && ret >= 0)
 			ret = -ENOMEM;
 	}
-
+error:
 	if (ret < 0)
 		clear_perf_probe_event(pev);
 
@@ -2140,37 +2166,40 @@ static int perf_probe_event__sprintf(const char *group, const char *event,
 				     const char *module,
 				     struct strbuf *result)
 {
-	int i;
+	int i, ret;
 	char *buf;
 
 	if (asprintf(&buf, "%s:%s", group, event) < 0)
 		return -errno;
-	strbuf_addf(result, "  %-20s (on ", buf);
+	ret = strbuf_addf(result, "  %-20s (on ", buf);
 	free(buf);
+	if (ret)
+		return ret;
 
 	/* Synthesize only event probe point */
 	buf = synthesize_perf_probe_point(&pev->point);
 	if (!buf)
 		return -ENOMEM;
-	strbuf_addstr(result, buf);
+	ret = strbuf_addstr(result, buf);
 	free(buf);
 
-	if (module)
-		strbuf_addf(result, " in %s", module);
+	if (!ret && module)
+		ret = strbuf_addf(result, " in %s", module);
 
-	if (pev->nargs > 0) {
-		strbuf_add(result, " with", 5);
-		for (i = 0; i < pev->nargs; i++) {
+	if (!ret && pev->nargs > 0) {
+		ret = strbuf_add(result, " with", 5);
+		for (i = 0; !ret && i < pev->nargs; i++) {
 			buf = synthesize_perf_probe_arg(&pev->args[i]);
 			if (!buf)
 				return -ENOMEM;
-			strbuf_addf(result, " %s", buf);
+			ret = strbuf_addf(result, " %s", buf);
 			free(buf);
 		}
 	}
-	strbuf_addch(result, ')');
+	if (!ret)
+		ret = strbuf_addch(result, ')');
 
-	return 0;
+	return ret;
 }
 
 /* Show an event */
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 9f68875..1259839 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1294,6 +1294,7 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 {
 	struct available_var_finder *af = data;
 	struct variable_list *vl;
+	struct strbuf buf = STRBUF_INIT;
 	int tag, ret;
 
 	vl = &af->vls[af->nvls - 1];
@@ -1307,25 +1308,26 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 		if (ret == 0 || ret == -ERANGE) {
 			int ret2;
 			bool externs = !af->child;
-			struct strbuf buf;
 
-			strbuf_init(&buf, 64);
+			if (strbuf_init(&buf, 64) < 0)
+				goto error;
 
 			if (probe_conf.show_location_range) {
-				if (!externs) {
-					if (ret)
-						strbuf_add(&buf, "[INV]\t", 6);
-					else
-						strbuf_add(&buf, "[VAL]\t", 6);
-				} else
-					strbuf_add(&buf, "[EXT]\t", 6);
+				if (!externs)
+					ret2 = strbuf_add(&buf,
+						ret ? "[INV]\t" : "[VAL]\t", 6);
+				else
+					ret2 = strbuf_add(&buf, "[EXT]\t", 6);
+				if (ret2)
+					goto error;
 			}
 
 			ret2 = die_get_varname(die_mem, &buf);
 
 			if (!ret2 && probe_conf.show_location_range &&
 				!externs) {
-				strbuf_addch(&buf, '\t');
+				if (strbuf_addch(&buf, '\t') < 0)
+					goto error;
 				ret2 = die_get_var_range(&af->pf.sp_die,
 							die_mem, &buf);
 			}
@@ -1334,8 +1336,8 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 			if (ret2 == 0) {
 				strlist__add(vl->vars,
 					strbuf_detach(&buf, NULL));
-			} else
-				strbuf_release(&buf);
+			}
+			strbuf_release(&buf);
 		}
 	}
 
@@ -1343,6 +1345,10 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 		return DIE_FIND_CB_CONTINUE;
 	else
 		return DIE_FIND_CB_SIBLING;
+error:
+	strbuf_release(&buf);
+	pr_debug("Error in strbuf\n");
+	return DIE_FIND_CB_END;
 }
 
 /* Add a found vars into available variables list */

[PATCH perf/core v3 3/8] perf help: Make check_emacsclient_version to check strbuf APIs

[Masami Hiramatsu]

Make check_emacsclient_version() to check the return
value of strbuf APIs so that it can handle errors in
strbuf.
---
 tools/perf/builtin-help.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
index bc1de9b..f9830c9 100644
--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -61,6 +61,7 @@ static int check_emacsclient_version(void)
 	struct child_process ec_process;
 	const char *argv_ec[] = { "emacsclient", "--version", NULL };
 	int version;
+	int ret = -1;
 
 	/* emacsclient prints its version number on stderr */
 	memset(&ec_process, 0, sizeof(ec_process));
@@ -71,7 +72,10 @@ static int check_emacsclient_version(void)
 		fprintf(stderr, "Failed to start emacsclient.\n");
 		return -1;
 	}
-	strbuf_read(&buffer, ec_process.err, 20);
+	if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
+		fprintf(stderr, "Failed to read emacsclient version\n");
+		goto out;
+	}
 	close(ec_process.err);
 
 	/*
@@ -82,8 +86,7 @@ static int check_emacsclient_version(void)
 
 	if (prefixcmp(buffer.buf, "emacsclient")) {
 		fprintf(stderr, "Failed to parse emacsclient version.\n");
-		strbuf_release(&buffer);
-		return -1;
+		goto out;
 	}
 
 	version = atoi(buffer.buf + strlen("emacsclient"));
@@ -92,12 +95,11 @@ static int check_emacsclient_version(void)
 		fprintf(stderr,
 			"emacsclient version '%d' too old (< 22).\n",
 			version);
-		strbuf_release(&buffer);
-		return -1;
-	}
-
+	} else
+		ret = 0;
+out:
 	strbuf_release(&buffer);
-	return 0;
+	return ret;
 }
 
 static void exec_woman_emacs(const char *path, const char *page)

[PATCH perf/core v3 4/8] perf: Make alias handler to check return value of strbuf

[Masami Hiramatsu]

Make alias handler and sq_quote_argv to check the return
value of strbuf APIs.
In sq_quote_argv() calls die(), but this fix handles strbuf
failure as a special case and returns to caller, since
the caller - handle_alias() also has to check the return
value of other strbuf APIs and those checks can be merged
to one if() statement.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/perf/perf.c       |    8 +++++---
 tools/perf/util/quote.c |   36 ++++++++++++++++++++----------------
 tools/perf/util/quote.h |    2 +-
 3 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 83ffe7c..7970008 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -309,9 +309,11 @@ static int handle_alias(int *argcp, const char ***argv)
 			if (*argcp > 1) {
 				struct strbuf buf;
 
-				strbuf_init(&buf, PATH_MAX);
-				strbuf_addstr(&buf, alias_string);
-				sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
+				if (strbuf_init(&buf, PATH_MAX) < 0 ||
+				    strbuf_addstr(&buf, alias_string) < 0 ||
+				    sq_quote_argv(&buf, (*argv) + 1,
+						  PATH_MAX) < 0)
+					die("Failed to allocate memory.");
 				free(alias_string);
 				alias_string = buf.buf;
 			}
diff --git a/tools/perf/util/quote.c b/tools/perf/util/quote.c
index 01f0324..c6d4ee2 100644
--- a/tools/perf/util/quote.c
+++ b/tools/perf/util/quote.c
@@ -17,38 +17,42 @@ static inline int need_bs_quote(char c)
 	return (c == '\'' || c == '!');
 }
 
-static void sq_quote_buf(struct strbuf *dst, const char *src)
+static int sq_quote_buf(struct strbuf *dst, const char *src)
 {
 	char *to_free = NULL;
+	int ret;
 
 	if (dst->buf == src)
 		to_free = strbuf_detach(dst, NULL);
 
-	strbuf_addch(dst, '\'');
-	while (*src) {
+	ret = strbuf_addch(dst, '\'');
+	while (!ret && *src) {
 		size_t len = strcspn(src, "'!");
-		strbuf_add(dst, src, len);
+		ret = strbuf_add(dst, src, len);
 		src += len;
-		while (need_bs_quote(*src)) {
-			strbuf_addstr(dst, "'\\");
-			strbuf_addch(dst, *src++);
-			strbuf_addch(dst, '\'');
-		}
+		while (!ret && need_bs_quote(*src))
+			ret = strbuf_addf(dst, "'\\%c\'", *src++);
 	}
-	strbuf_addch(dst, '\'');
+	if (!ret)
+		ret = strbuf_addch(dst, '\'');
 	free(to_free);
+
+	return ret;
 }
 
-void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
+int sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
 {
-	int i;
+	int i, ret;
 
 	/* Copy into destination buffer. */
-	strbuf_grow(dst, 255);
-	for (i = 0; argv[i]; ++i) {
-		strbuf_addch(dst, ' ');
-		sq_quote_buf(dst, argv[i]);
+	ret = strbuf_grow(dst, 255);
+	for (i = 0; !ret && argv[i]; ++i) {
+		ret = strbuf_addch(dst, ' ');
+		if (ret)
+			break;
+		ret = sq_quote_buf(dst, argv[i]);
 		if (maxlen && dst->len > maxlen)
 			die("Too many or long arguments");
 	}
+	return ret;
 }
diff --git a/tools/perf/util/quote.h b/tools/perf/util/quote.h
index 3340c9c..e1ec191 100644
--- a/tools/perf/util/quote.h
+++ b/tools/perf/util/quote.h
@@ -24,6 +24,6 @@
  * sq_quote() in a real application.
  */
 
-void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
+int sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
 
 #endif /* __PERF_QUOTE_H */

[PATCH perf/core v3 5/8] perf header: Make topology checkers to check return value of strbuf

[Masami Hiramatsu]

Make topology checkers to check the return value of strbuf
APIs so that it can detect errors in it.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 Changes in v3:
  - Avoid using STRBUF_INIT and return error directly before
    initalizing strbuf.
---
 tools/perf/util/header.c |   31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 90680ec..c6000d4 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1819,7 +1819,8 @@ static int process_cpu_topology(struct perf_file_section *section,
 
 	ph->env.nr_sibling_cores = nr;
 	size += sizeof(u32);
-	strbuf_init(&sb, 128);
+	if (strbuf_init(&sb, 128) < 0)
+		goto free_cpu;
 
 	for (i = 0; i < nr; i++) {
 		str = do_read_string(fd, ph);
@@ -1827,7 +1828,8 @@ static int process_cpu_topology(struct perf_file_section *section,
 			goto error;
 
 		/* include a NULL character at the end */
-		strbuf_add(&sb, str, strlen(str) + 1);
+		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
+			goto error;
 		size += string_size(str);
 		free(str);
 	}
@@ -1849,7 +1851,8 @@ static int process_cpu_topology(struct perf_file_section *section,
 			goto error;
 
 		/* include a NULL character at the end */
-		strbuf_add(&sb, str, strlen(str) + 1);
+		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
+			goto error;
 		size += string_size(str);
 		free(str);
 	}
@@ -1912,13 +1915,14 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
 	/* nr nodes */
 	ret = readn(fd, &nr, sizeof(nr));
 	if (ret != sizeof(nr))
-		goto error;
+		return -1;
 
 	if (ph->needs_swap)
 		nr = bswap_32(nr);
 
 	ph->env.nr_numa_nodes = nr;
-	strbuf_init(&sb, 256);
+	if (strbuf_init(&sb, 256) < 0)
+		return -1;
 
 	for (i = 0; i < nr; i++) {
 		/* node number */
@@ -1940,15 +1944,17 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
 			mem_free = bswap_64(mem_free);
 		}
 
-		strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
-			    node, mem_total, mem_free);
+		if (strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
+				node, mem_total, mem_free) < 0)
+			goto error;
 
 		str = do_read_string(fd, ph);
 		if (!str)
 			goto error;
 
 		/* include a NULL character at the end */
-		strbuf_add(&sb, str, strlen(str) + 1);
+		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
+			goto error;
 		free(str);
 	}
 	ph->env.numa_nodes = strbuf_detach(&sb, NULL);
@@ -1982,7 +1988,8 @@ static int process_pmu_mappings(struct perf_file_section *section __maybe_unused
 	}
 
 	ph->env.nr_pmu_mappings = pmu_num;
-	strbuf_init(&sb, 128);
+	if (strbuf_init(&sb, 128) < 0)
+		return -1;
 
 	while (pmu_num) {
 		if (readn(fd, &type, sizeof(type)) != sizeof(type))
@@ -1994,9 +2001,11 @@ static int process_pmu_mappings(struct perf_file_section *section __maybe_unused
 		if (!name)
 			goto error;
 
-		strbuf_addf(&sb, "%u:%s", type, name);
+		if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
+			goto error;
 		/* include a NULL character at the end */
-		strbuf_add(&sb, "", 1);
+		if (strbuf_add(&sb, "", 1) < 0)
+			goto error;
 
 		if (!strcmp(name, "msr"))
 			ph->env.msr_pmu_type = type;

[PATCH perf/core v3 6/8] perf pmu: Make pmu_formats_string to check return value of strbuf

[Masami Hiramatsu]

Make pmu_formats_string() to check return value of
strbuf APIs so that it can detect errors in it.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/perf/util/pmu.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index bf34468..ddb0261 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -643,20 +643,20 @@ static int pmu_resolve_param_term(struct parse_events_term *term,
 static char *pmu_formats_string(struct list_head *formats)
 {
 	struct perf_pmu_format *format;
-	char *str;
-	struct strbuf buf;
+	char *str = NULL;
+	struct strbuf buf = STRBUF_INIT;
 	unsigned i = 0;
 
 	if (!formats)
 		return NULL;
 
-	strbuf_init(&buf, 0);
 	/* sysfs exported terms */
 	list_for_each_entry(format, formats, list)
-		strbuf_addf(&buf, i++ ? ",%s" : "%s",
-			    format->name);
+		if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
+			goto error;
 
 	str = strbuf_detach(&buf, NULL);
+error:
 	strbuf_release(&buf);
 
 	return str;

[PATCH perf/core v3 7/8] perf help: Do not use ALLOC_GROW in add_cmd_list

[Masami Hiramatsu]

Replace ALLOC_GROW with normal realloc code in add_cmd_list()
so that it can handle errors directly.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/perf/util/help-unknown-cmd.c |   30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/help-unknown-cmd.c b/tools/perf/util/help-unknown-cmd.c
index 43a98a4..d62ccae 100644
--- a/tools/perf/util/help-unknown-cmd.c
+++ b/tools/perf/util/help-unknown-cmd.c
@@ -27,16 +27,27 @@ static int levenshtein_compare(const void *p1, const void *p2)
 	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
 }
 
-static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
+static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
 {
-	unsigned int i;
-
-	ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
-
+	unsigned int i, nr = cmds->cnt + old->cnt;
+	void *tmp;
+
+	if (nr > cmds->alloc) {
+		/* Choose bigger one to alloc */
+		if (alloc_nr(cmds->alloc) < nr)
+			cmds->alloc = nr;
+		else
+			cmds->alloc = alloc_nr(cmds->alloc);
+		tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names));
+		if (!tmp)
+			return -1;
+		cmds->names = tmp;
+	}
 	for (i = 0; i < old->cnt; i++)
 		cmds->names[cmds->cnt++] = old->names[i];
 	zfree(&old->names);
 	old->cnt = 0;
+	return 0;
 }
 
 const char *help_unknown_cmd(const char *cmd)
@@ -52,8 +63,11 @@ const char *help_unknown_cmd(const char *cmd)
 
 	load_command_list("perf-", &main_cmds, &other_cmds);
 
-	add_cmd_list(&main_cmds, &aliases);
-	add_cmd_list(&main_cmds, &other_cmds);
+	if (add_cmd_list(&main_cmds, &aliases) < 0 ||
+	    add_cmd_list(&main_cmds, &other_cmds) < 0) {
+		fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n");
+		goto end;
+	}
 	qsort(main_cmds.names, main_cmds.cnt,
 	      sizeof(main_cmds.names), cmdname_compare);
 	uniq(&main_cmds);
@@ -99,6 +113,6 @@ const char *help_unknown_cmd(const char *cmd)
 		for (i = 0; i < n; i++)
 			fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
 	}
-
+end:
 	exit(1);
 }

[PATCH perf/core v3 8/8] perf tools: Remove xrealloc and ALLOC_GROW

[Masami Hiramatsu]

Remove unused xrealloc() and ALLOC_GROW() from libperf.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/perf/util/Build     |    1 -
 tools/perf/util/cache.h   |   19 -------------------
 tools/perf/util/util.h    |    6 ------
 tools/perf/util/wrapper.c |   29 -----------------------------
 4 files changed, 55 deletions(-)
 delete mode 100644 tools/perf/util/wrapper.c

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 027bb2b..8c6c8a0 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -27,7 +27,6 @@ libperf-y += strlist.o
 libperf-y += strfilter.o
 libperf-y += top.o
 libperf-y += usage.o
-libperf-y += wrapper.o
 libperf-y += dso.o
 libperf-y += symbol.o
 libperf-y += symbol_fprintf.o
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 1f5a93c..0d814bb 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -40,25 +40,6 @@ int split_cmdline(char *cmdline, const char ***argv);
 
 #define alloc_nr(x) (((x)+16)*3/2)
 
-/*
- * Realloc the buffer pointed at by variable 'x' so that it can hold
- * at least 'nr' entries; the number of entries currently allocated
- * is 'alloc', using the standard growing factor alloc_nr() macro.
- *
- * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
- */
-#define ALLOC_GROW(x, nr, alloc) \
-	do { \
-		if ((nr) > alloc) { \
-			if (alloc_nr(alloc) < (nr)) \
-				alloc = (nr); \
-			else \
-				alloc = alloc_nr(alloc); \
-			x = xrealloc((x), alloc * sizeof(*(x))); \
-		} \
-	} while(0)
-
-
 static inline int is_absolute_path(const char *path)
 {
 	return path[0] == '/';
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 88f607a..7651633 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -160,12 +160,6 @@ static inline char *gitstrchrnul(const char *s, int c)
 }
 #endif
 
-/*
- * Wrappers:
- */
-void *xrealloc(void *ptr, size_t size) __attribute__((weak));
-
-
 static inline void *zalloc(size_t size)
 {
 	return calloc(1, size);
diff --git a/tools/perf/util/wrapper.c b/tools/perf/util/wrapper.c
deleted file mode 100644
index 5f1a07c..0000000
--- a/tools/perf/util/wrapper.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Various trivial helper wrappers around standard functions
- */
-#include "cache.h"
-
-/*
- * There's no pack memory to release - but stay close to the Git
- * version so wrap this away:
- */
-static inline void release_pack_memory(size_t size __maybe_unused,
-				       int flag __maybe_unused)
-{
-}
-
-void *xrealloc(void *ptr, size_t size)
-{
-	void *ret = realloc(ptr, size);
-	if (!ret && !size)
-		ret = realloc(ptr, 1);
-	if (!ret) {
-		release_pack_memory(size, -1);
-		ret = realloc(ptr, size);
-		if (!ret && !size)
-			ret = realloc(ptr, 1);
-		if (!ret)
-			die("Out of memory, realloc failed");
-	}
-	return ret;
-}

Re: [PATCH perf/core v3 3/8] perf help: Make check_emacsclient_version to check strbuf APIs

[Arnaldo Carvalho de Melo]

Em Tue, May 10, 2016 at 02:47:17PM +0900, Masami Hiramatsu escreveu:
> Make check_emacsclient_version() to check the return
> value of strbuf APIs so that it can handle errors in
> strbuf.
> ---

You forgot to add the S-o-B, since you provided it in the previous
submission, I'm adding it now.

- Arnaldo

>  tools/perf/builtin-help.c |   18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
> index bc1de9b..f9830c9 100644
> --- a/tools/perf/builtin-help.c
> +++ b/tools/perf/builtin-help.c
> @@ -61,6 +61,7 @@ static int check_emacsclient_version(void)
>  	struct child_process ec_process;
>  	const char *argv_ec[] = { "emacsclient", "--version", NULL };
>  	int version;
> +	int ret = -1;
>  
>  	/* emacsclient prints its version number on stderr */
>  	memset(&ec_process, 0, sizeof(ec_process));
> @@ -71,7 +72,10 @@ static int check_emacsclient_version(void)
>  		fprintf(stderr, "Failed to start emacsclient.\n");
>  		return -1;
>  	}
> -	strbuf_read(&buffer, ec_process.err, 20);
> +	if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
> +		fprintf(stderr, "Failed to read emacsclient version\n");
> +		goto out;
> +	}
>  	close(ec_process.err);
>  
>  	/*
> @@ -82,8 +86,7 @@ static int check_emacsclient_version(void)
>  
>  	if (prefixcmp(buffer.buf, "emacsclient")) {
>  		fprintf(stderr, "Failed to parse emacsclient version.\n");
> -		strbuf_release(&buffer);
> -		return -1;
> +		goto out;
>  	}
>  
>  	version = atoi(buffer.buf + strlen("emacsclient"));
> @@ -92,12 +95,11 @@ static int check_emacsclient_version(void)
>  		fprintf(stderr,
>  			"emacsclient version '%d' too old (< 22).\n",
>  			version);
> -		strbuf_release(&buffer);
> -		return -1;
> -	}
> -
> +	} else
> +		ret = 0;
> +out:
>  	strbuf_release(&buffer);
> -	return 0;
> +	return ret;
>  }
>  
>  static void exec_woman_emacs(const char *path, const char *page)

[tip:perf/core] perf tools: Rewrite strbuf not to die()

[tip-bot for Masami Hiramatsu]

Commit-ID:  5cea57f30a12443c05e0c5273f35d2fcef00d30a
Gitweb:     http://git.kernel.org/tip/5cea57f30a12443c05e0c5273f35d2fcef00d30a
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:46:58 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:27:58 -0300

perf tools: Rewrite strbuf not to die()

Rewrite strbuf implementation not to use die() nor xrealloc().  Instead
of die(), now most of the API returns error code or 0 if succeeded.

Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054658.6158.24080.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/strbuf.c | 93 ++++++++++++++++++++++++++++++++++--------------
 tools/perf/util/strbuf.h | 25 +++++++------
 2 files changed, 82 insertions(+), 36 deletions(-)

diff --git a/tools/perf/util/strbuf.c b/tools/perf/util/strbuf.c
index 8fb7329..f95f682 100644
--- a/tools/perf/util/strbuf.c
+++ b/tools/perf/util/strbuf.c
@@ -1,3 +1,4 @@
+#include "debug.h"
 #include "cache.h"
 #include <linux/kernel.h>
 
@@ -17,12 +18,13 @@ int prefixcmp(const char *str, const char *prefix)
  */
 char strbuf_slopbuf[1];
 
-void strbuf_init(struct strbuf *sb, ssize_t hint)
+int strbuf_init(struct strbuf *sb, ssize_t hint)
 {
 	sb->alloc = sb->len = 0;
 	sb->buf = strbuf_slopbuf;
 	if (hint)
-		strbuf_grow(sb, hint);
+		return strbuf_grow(sb, hint);
+	return 0;
 }
 
 void strbuf_release(struct strbuf *sb)
@@ -42,67 +44,104 @@ char *strbuf_detach(struct strbuf *sb, size_t *sz)
 	return res;
 }
 
-void strbuf_grow(struct strbuf *sb, size_t extra)
+int strbuf_grow(struct strbuf *sb, size_t extra)
 {
-	if (sb->len + extra + 1 <= sb->len)
-		die("you want to use way too much memory");
-	if (!sb->alloc)
-		sb->buf = NULL;
-	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
+	char *buf;
+	size_t nr = sb->len + extra + 1;
+
+	if (nr < sb->alloc)
+		return 0;
+
+	if (nr <= sb->len)
+		return -E2BIG;
+
+	if (alloc_nr(sb->alloc) > nr)
+		nr = alloc_nr(sb->alloc);
+
+	/*
+	 * Note that sb->buf == strbuf_slopbuf if sb->alloc == 0, and it is
+	 * a static variable. Thus we have to avoid passing it to realloc.
+	 */
+	buf = realloc(sb->alloc ? sb->buf : NULL, nr * sizeof(*buf));
+	if (!buf)
+		return -ENOMEM;
+
+	sb->buf = buf;
+	sb->alloc = nr;
+	return 0;
 }
 
-void strbuf_addch(struct strbuf *sb, int c)
+int strbuf_addch(struct strbuf *sb, int c)
 {
-	strbuf_grow(sb, 1);
+	int ret = strbuf_grow(sb, 1);
+	if (ret)
+		return ret;
+
 	sb->buf[sb->len++] = c;
 	sb->buf[sb->len] = '\0';
+	return 0;
 }
 
-void strbuf_add(struct strbuf *sb, const void *data, size_t len)
+int strbuf_add(struct strbuf *sb, const void *data, size_t len)
 {
-	strbuf_grow(sb, len);
+	int ret = strbuf_grow(sb, len);
+	if (ret)
+		return ret;
+
 	memcpy(sb->buf + sb->len, data, len);
-	strbuf_setlen(sb, sb->len + len);
+	return strbuf_setlen(sb, sb->len + len);
 }
 
-static void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
+static int strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
 {
-	int len;
+	int len, ret;
 	va_list ap_saved;
 
-	if (!strbuf_avail(sb))
-		strbuf_grow(sb, 64);
+	if (!strbuf_avail(sb)) {
+		ret = strbuf_grow(sb, 64);
+		if (ret)
+			return ret;
+	}
 
 	va_copy(ap_saved, ap);
 	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 	if (len < 0)
-		die("your vsnprintf is broken");
+		return len;
 	if (len > strbuf_avail(sb)) {
-		strbuf_grow(sb, len);
+		ret = strbuf_grow(sb, len);
+		if (ret)
+			return ret;
 		len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved);
 		va_end(ap_saved);
 		if (len > strbuf_avail(sb)) {
-			die("this should not happen, your vsnprintf is broken");
+			pr_debug("this should not happen, your vsnprintf is broken");
+			return -EINVAL;
 		}
 	}
-	strbuf_setlen(sb, sb->len + len);
+	return strbuf_setlen(sb, sb->len + len);
 }
 
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+int strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 {
 	va_list ap;
+	int ret;
 
 	va_start(ap, fmt);
-	strbuf_addv(sb, fmt, ap);
+	ret = strbuf_addv(sb, fmt, ap);
 	va_end(ap);
+	return ret;
 }
 
 ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
 {
 	size_t oldlen = sb->len;
 	size_t oldalloc = sb->alloc;
+	int ret;
+
+	ret = strbuf_grow(sb, hint ? hint : 8192);
+	if (ret)
+		return ret;
 
-	strbuf_grow(sb, hint ? hint : 8192);
 	for (;;) {
 		ssize_t cnt;
 
@@ -112,12 +151,14 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
 				strbuf_release(sb);
 			else
 				strbuf_setlen(sb, oldlen);
-			return -1;
+			return cnt;
 		}
 		if (!cnt)
 			break;
 		sb->len += cnt;
-		strbuf_grow(sb, 8192);
+		ret = strbuf_grow(sb, 8192);
+		if (ret)
+			return ret;
 	}
 
 	sb->buf[sb->len] = '\0';
diff --git a/tools/perf/util/strbuf.h b/tools/perf/util/strbuf.h
index ab9be0fb..54b4092 100644
--- a/tools/perf/util/strbuf.h
+++ b/tools/perf/util/strbuf.h
@@ -51,7 +51,7 @@ struct strbuf {
 #define STRBUF_INIT  { 0, 0, strbuf_slopbuf }
 
 /*----- strbuf life cycle -----*/
-void strbuf_init(struct strbuf *buf, ssize_t hint);
+int strbuf_init(struct strbuf *buf, ssize_t hint);
 void strbuf_release(struct strbuf *buf);
 char *strbuf_detach(struct strbuf *buf, size_t *);
 
@@ -60,26 +60,31 @@ static inline ssize_t strbuf_avail(const struct strbuf *sb) {
 	return sb->alloc ? sb->alloc - sb->len - 1 : 0;
 }
 
-void strbuf_grow(struct strbuf *buf, size_t);
+int strbuf_grow(struct strbuf *buf, size_t);
 
-static inline void strbuf_setlen(struct strbuf *sb, size_t len) {
-	if (!sb->alloc)
-		strbuf_grow(sb, 0);
+static inline int strbuf_setlen(struct strbuf *sb, size_t len) {
+	int ret;
+	if (!sb->alloc) {
+		ret = strbuf_grow(sb, 0);
+		if (ret)
+			return ret;
+	}
 	assert(len < sb->alloc);
 	sb->len = len;
 	sb->buf[len] = '\0';
+	return 0;
 }
 
 /*----- add data in your buffer -----*/
-void strbuf_addch(struct strbuf *sb, int c);
+int strbuf_addch(struct strbuf *sb, int c);
 
-void strbuf_add(struct strbuf *buf, const void *, size_t);
-static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
-	strbuf_add(sb, s, strlen(s));
+int strbuf_add(struct strbuf *buf, const void *, size_t);
+static inline int strbuf_addstr(struct strbuf *sb, const char *s) {
+	return strbuf_add(sb, s, strlen(s));
 }
 
 __attribute__((format(printf,2,3)))
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
+int strbuf_addf(struct strbuf *sb, const char *fmt, ...);
 
 /* XXX: if read fails, any partial read is undone */
 ssize_t strbuf_read(struct strbuf *, int fd, ssize_t hint);

[tip:perf/core] perf probe: Check the return value of strbuf APIs

[tip-bot for Masami Hiramatsu]

Commit-ID:  bf4d5f25c90bf2eca8671f2fc4e3d15919cd7f9c
Gitweb:     http://git.kernel.org/tip/bf4d5f25c90bf2eca8671f2fc4e3d15919cd7f9c
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:47:07 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:53:34 -0300

perf probe: Check the return value of strbuf APIs

Check the return value of strbuf APIs in perf-probe
related code, so that it can handle errors in strbuf.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054707.6158.69861.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/dwarf-aux.c    |  52 +++++++--------
 tools/perf/util/probe-event.c  | 143 +++++++++++++++++++++++++----------------
 tools/perf/util/probe-finder.c |  30 +++++----
 3 files changed, 128 insertions(+), 97 deletions(-)

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index aea189b..a347b19 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -915,8 +915,7 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
 		tmp = "*";
 	else if (tag == DW_TAG_subroutine_type) {
 		/* Function pointer */
-		strbuf_add(buf, "(function_type)", 15);
-		return 0;
+		return strbuf_add(buf, "(function_type)", 15);
 	} else {
 		if (!dwarf_diename(&type))
 			return -ENOENT;
@@ -927,14 +926,10 @@ int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
 		else if (tag == DW_TAG_enumeration_type)
 			tmp = "enum ";
 		/* Write a base name */
-		strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
-		return 0;
+		return strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
 	}
 	ret = die_get_typename(&type, buf);
-	if (ret == 0)
-		strbuf_addstr(buf, tmp);
-
-	return ret;
+	return ret ? ret : strbuf_addstr(buf, tmp);
 }
 
 /**
@@ -951,12 +946,10 @@ int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
 	ret = die_get_typename(vr_die, buf);
 	if (ret < 0) {
 		pr_debug("Failed to get type, make it unknown.\n");
-		strbuf_add(buf, " (unknown_type)", 14);
+		ret = strbuf_add(buf, " (unknown_type)", 14);
 	}
 
-	strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
-
-	return 0;
+	return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
 }
 
 #ifdef HAVE_DWARF_GETLOCATIONS
@@ -999,22 +992,24 @@ static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
 	}
 
 	while ((offset = dwarf_ranges(&scopes[1], offset, &base,
-				&start, &end)) > 0) {
+					&start, &end)) > 0) {
 		start -= entry;
 		end -= entry;
 
 		if (first) {
-			strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
-				name, start, end);
+			ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
+					  name, start, end);
 			first = false;
 		} else {
-			strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
-				start, end);
+			ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
+					  start, end);
 		}
+		if (ret < 0)
+			goto out;
 	}
 
 	if (!first)
-		strbuf_add(buf, "]>", 2);
+		ret = strbuf_add(buf, "]>", 2);
 
 out:
 	free(scopes);
@@ -1054,31 +1049,32 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
 	if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
 		return -EINVAL;
 
-	while ((offset = dwarf_getlocations(
-				&attr, offset, &base,
-				&start, &end, &op, &nops)) > 0) {
+	while ((offset = dwarf_getlocations(&attr, offset, &base,
+					&start, &end, &op, &nops)) > 0) {
 		if (start == 0) {
 			/* Single Location Descriptions */
 			ret = die_get_var_innermost_scope(sp_die, vr_die, buf);
-			return ret;
+			goto out;
 		}
 
 		/* Location Lists */
 		start -= entry;
 		end -= entry;
 		if (first) {
-			strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
-				name, start, end);
+			ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
+					  name, start, end);
 			first = false;
 		} else {
-			strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
-				start, end);
+			ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
+					  start, end);
 		}
+		if (ret < 0)
+			goto out;
 	}
 
 	if (!first)
-		strbuf_add(buf, "]>", 2);
-
+		ret = strbuf_add(buf, "]>", 2);
+out:
 	return ret;
 }
 #else
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index c82c625..74401a2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1677,28 +1677,37 @@ char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
 {
 	struct perf_probe_arg_field *field = pa->field;
 	struct strbuf buf;
-	char *ret;
+	char *ret = NULL;
+	int err;
+
+	if (strbuf_init(&buf, 64) < 0)
+		return NULL;
 
-	strbuf_init(&buf, 64);
 	if (pa->name && pa->var)
-		strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
+		err = strbuf_addf(&buf, "%s=%s", pa->name, pa->var);
 	else
-		strbuf_addstr(&buf, pa->name ?: pa->var);
+		err = strbuf_addstr(&buf, pa->name ?: pa->var);
+	if (err)
+		goto out;
 
 	while (field) {
 		if (field->name[0] == '[')
-			strbuf_addstr(&buf, field->name);
+			err = strbuf_addstr(&buf, field->name);
 		else
-			strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
-				    field->name);
+			err = strbuf_addf(&buf, "%s%s", field->ref ? "->" : ".",
+					  field->name);
 		field = field->next;
+		if (err)
+			goto out;
 	}
 
 	if (pa->type)
-		strbuf_addf(&buf, ":%s", pa->type);
+		if (strbuf_addf(&buf, ":%s", pa->type) < 0)
+			goto out;
 
 	ret = strbuf_detach(&buf, NULL);
-
+out:
+	strbuf_release(&buf);
 	return ret;
 }
 
@@ -1706,18 +1715,23 @@ char *synthesize_perf_probe_arg(struct perf_probe_arg *pa)
 static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 {
 	struct strbuf buf;
-	char *tmp;
-	int len;
+	char *tmp, *ret = NULL;
+	int len, err = 0;
+
+	if (strbuf_init(&buf, 64) < 0)
+		return NULL;
 
-	strbuf_init(&buf, 64);
 	if (pp->function) {
-		strbuf_addstr(&buf, pp->function);
+		if (strbuf_addstr(&buf, pp->function) < 0)
+			goto out;
 		if (pp->offset)
-			strbuf_addf(&buf, "+%lu", pp->offset);
+			err = strbuf_addf(&buf, "+%lu", pp->offset);
 		else if (pp->line)
-			strbuf_addf(&buf, ":%d", pp->line);
+			err = strbuf_addf(&buf, ":%d", pp->line);
 		else if (pp->retprobe)
-			strbuf_addstr(&buf, "%return");
+			err = strbuf_addstr(&buf, "%return");
+		if (err)
+			goto out;
 	}
 	if (pp->file) {
 		tmp = pp->file;
@@ -1726,12 +1740,15 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 			tmp = strchr(pp->file + len - 30, '/');
 			tmp = tmp ? tmp + 1 : pp->file + len - 30;
 		}
-		strbuf_addf(&buf, "@%s", tmp);
-		if (!pp->function && pp->line)
-			strbuf_addf(&buf, ":%d", pp->line);
+		err = strbuf_addf(&buf, "@%s", tmp);
+		if (!err && !pp->function && pp->line)
+			err = strbuf_addf(&buf, ":%d", pp->line);
 	}
-
-	return strbuf_detach(&buf, NULL);
+	if (!err)
+		ret = strbuf_detach(&buf, NULL);
+out:
+	strbuf_release(&buf);
+	return ret;
 }
 
 #if 0
@@ -1762,28 +1779,30 @@ char *synthesize_perf_probe_command(struct perf_probe_event *pev)
 static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
 					    struct strbuf *buf, int depth)
 {
+	int err;
 	if (ref->next) {
 		depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
 							 depth + 1);
 		if (depth < 0)
-			goto out;
+			return depth;
 	}
-	strbuf_addf(buf, "%+ld(", ref->offset);
-out:
-	return depth;
+	err = strbuf_addf(buf, "%+ld(", ref->offset);
+	return (err < 0) ? err : depth;
 }
 
 static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
 				      struct strbuf *buf)
 {
 	struct probe_trace_arg_ref *ref = arg->ref;
-	int depth = 0;
+	int depth = 0, err;
 
 	/* Argument name or separator */
 	if (arg->name)
-		strbuf_addf(buf, " %s=", arg->name);
+		err = strbuf_addf(buf, " %s=", arg->name);
 	else
-		strbuf_addch(buf, ' ');
+		err = strbuf_addch(buf, ' ');
+	if (err)
+		return err;
 
 	/* Special case: @XXX */
 	if (arg->value[0] == '@' && arg->ref)
@@ -1798,18 +1817,19 @@ static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
 
 	/* Print argument value */
 	if (arg->value[0] == '@' && arg->ref)
-		strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
+		err = strbuf_addf(buf, "%s%+ld", arg->value, arg->ref->offset);
 	else
-		strbuf_addstr(buf, arg->value);
+		err = strbuf_addstr(buf, arg->value);
 
 	/* Closing */
-	while (depth--)
-		strbuf_addch(buf, ')');
+	while (!err && depth--)
+		err = strbuf_addch(buf, ')');
+
 	/* Print argument type */
-	if (arg->type)
-		strbuf_addf(buf, ":%s", arg->type);
+	if (!err && arg->type)
+		err = strbuf_addf(buf, ":%s", arg->type);
 
-	return 0;
+	return err;
 }
 
 char *synthesize_probe_trace_command(struct probe_trace_event *tev)
@@ -1817,15 +1837,18 @@ char *synthesize_probe_trace_command(struct probe_trace_event *tev)
 	struct probe_trace_point *tp = &tev->point;
 	struct strbuf buf;
 	char *ret = NULL;
-	int i;
+	int i, err;
 
 	/* Uprobes must have tp->module */
 	if (tev->uprobes && !tp->module)
 		return NULL;
 
-	strbuf_init(&buf, 32);
-	strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
-		    tev->group, tev->event);
+	if (strbuf_init(&buf, 32) < 0)
+		return NULL;
+
+	if (strbuf_addf(&buf, "%c:%s/%s ", tp->retprobe ? 'r' : 'p',
+			tev->group, tev->event) < 0)
+		goto error;
 	/*
 	 * If tp->address == 0, then this point must be a
 	 * absolute address uprobe.
@@ -1839,14 +1862,16 @@ char *synthesize_probe_trace_command(struct probe_trace_event *tev)
 
 	/* Use the tp->address for uprobes */
 	if (tev->uprobes)
-		strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
+		err = strbuf_addf(&buf, "%s:0x%lx", tp->module, tp->address);
 	else if (!strncmp(tp->symbol, "0x", 2))
 		/* Absolute address. See try_to_find_absolute_address() */
-		strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
-			    tp->module ? ":" : "", tp->address);
+		err = strbuf_addf(&buf, "%s%s0x%lx", tp->module ?: "",
+				  tp->module ? ":" : "", tp->address);
 	else
-		strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
-			    tp->module ? ":" : "", tp->symbol, tp->offset);
+		err = strbuf_addf(&buf, "%s%s%s+%lu", tp->module ?: "",
+				tp->module ? ":" : "", tp->symbol, tp->offset);
+	if (err)
+		goto error;
 
 	for (i = 0; i < tev->nargs; i++)
 		if (synthesize_probe_trace_arg(&tev->args[i], &buf) < 0)
@@ -1960,14 +1985,15 @@ static int convert_to_perf_probe_event(struct probe_trace_event *tev,
 		if (tev->args[i].name)
 			pev->args[i].name = strdup(tev->args[i].name);
 		else {
-			strbuf_init(&buf, 32);
+			if ((ret = strbuf_init(&buf, 32)) < 0)
+				goto error;
 			ret = synthesize_probe_trace_arg(&tev->args[i], &buf);
 			pev->args[i].name = strbuf_detach(&buf, NULL);
 		}
 		if (pev->args[i].name == NULL && ret >= 0)
 			ret = -ENOMEM;
 	}
-
+error:
 	if (ret < 0)
 		clear_perf_probe_event(pev);
 
@@ -2140,37 +2166,40 @@ static int perf_probe_event__sprintf(const char *group, const char *event,
 				     const char *module,
 				     struct strbuf *result)
 {
-	int i;
+	int i, ret;
 	char *buf;
 
 	if (asprintf(&buf, "%s:%s", group, event) < 0)
 		return -errno;
-	strbuf_addf(result, "  %-20s (on ", buf);
+	ret = strbuf_addf(result, "  %-20s (on ", buf);
 	free(buf);
+	if (ret)
+		return ret;
 
 	/* Synthesize only event probe point */
 	buf = synthesize_perf_probe_point(&pev->point);
 	if (!buf)
 		return -ENOMEM;
-	strbuf_addstr(result, buf);
+	ret = strbuf_addstr(result, buf);
 	free(buf);
 
-	if (module)
-		strbuf_addf(result, " in %s", module);
+	if (!ret && module)
+		ret = strbuf_addf(result, " in %s", module);
 
-	if (pev->nargs > 0) {
-		strbuf_add(result, " with", 5);
-		for (i = 0; i < pev->nargs; i++) {
+	if (!ret && pev->nargs > 0) {
+		ret = strbuf_add(result, " with", 5);
+		for (i = 0; !ret && i < pev->nargs; i++) {
 			buf = synthesize_perf_probe_arg(&pev->args[i]);
 			if (!buf)
 				return -ENOMEM;
-			strbuf_addf(result, " %s", buf);
+			ret = strbuf_addf(result, " %s", buf);
 			free(buf);
 		}
 	}
-	strbuf_addch(result, ')');
+	if (!ret)
+		ret = strbuf_addch(result, ')');
 
-	return 0;
+	return ret;
 }
 
 /* Show an event */
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 9f68875..1259839 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1294,6 +1294,7 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 {
 	struct available_var_finder *af = data;
 	struct variable_list *vl;
+	struct strbuf buf = STRBUF_INIT;
 	int tag, ret;
 
 	vl = &af->vls[af->nvls - 1];
@@ -1307,25 +1308,26 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 		if (ret == 0 || ret == -ERANGE) {
 			int ret2;
 			bool externs = !af->child;
-			struct strbuf buf;
 
-			strbuf_init(&buf, 64);
+			if (strbuf_init(&buf, 64) < 0)
+				goto error;
 
 			if (probe_conf.show_location_range) {
-				if (!externs) {
-					if (ret)
-						strbuf_add(&buf, "[INV]\t", 6);
-					else
-						strbuf_add(&buf, "[VAL]\t", 6);
-				} else
-					strbuf_add(&buf, "[EXT]\t", 6);
+				if (!externs)
+					ret2 = strbuf_add(&buf,
+						ret ? "[INV]\t" : "[VAL]\t", 6);
+				else
+					ret2 = strbuf_add(&buf, "[EXT]\t", 6);
+				if (ret2)
+					goto error;
 			}
 
 			ret2 = die_get_varname(die_mem, &buf);
 
 			if (!ret2 && probe_conf.show_location_range &&
 				!externs) {
-				strbuf_addch(&buf, '\t');
+				if (strbuf_addch(&buf, '\t') < 0)
+					goto error;
 				ret2 = die_get_var_range(&af->pf.sp_die,
 							die_mem, &buf);
 			}
@@ -1334,8 +1336,8 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 			if (ret2 == 0) {
 				strlist__add(vl->vars,
 					strbuf_detach(&buf, NULL));
-			} else
-				strbuf_release(&buf);
+			}
+			strbuf_release(&buf);
 		}
 	}
 
@@ -1343,6 +1345,10 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
 		return DIE_FIND_CB_CONTINUE;
 	else
 		return DIE_FIND_CB_SIBLING;
+error:
+	strbuf_release(&buf);
+	pr_debug("Error in strbuf\n");
+	return DIE_FIND_CB_END;
 }
 
 /* Add a found vars into available variables list */

[tip:perf/core] perf help: Make check_emacsclient_version to check strbuf APIs

[tip-bot for Masami Hiramatsu]

Commit-ID:  b72ca4039099e953f1ea2dbd58c201b14feb6605
Gitweb:     http://git.kernel.org/tip/b72ca4039099e953f1ea2dbd58c201b14feb6605
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:47:17 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:56:14 -0300

perf help: Make check_emacsclient_version to check strbuf APIs

Make check_emacsclient_version() to check the return value of strbuf
APIs so that it can handle errors in strbuf.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054716.6158.11755.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-help.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
index bc1de9b..f9830c9 100644
--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -61,6 +61,7 @@ static int check_emacsclient_version(void)
 	struct child_process ec_process;
 	const char *argv_ec[] = { "emacsclient", "--version", NULL };
 	int version;
+	int ret = -1;
 
 	/* emacsclient prints its version number on stderr */
 	memset(&ec_process, 0, sizeof(ec_process));
@@ -71,7 +72,10 @@ static int check_emacsclient_version(void)
 		fprintf(stderr, "Failed to start emacsclient.\n");
 		return -1;
 	}
-	strbuf_read(&buffer, ec_process.err, 20);
+	if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
+		fprintf(stderr, "Failed to read emacsclient version\n");
+		goto out;
+	}
 	close(ec_process.err);
 
 	/*
@@ -82,8 +86,7 @@ static int check_emacsclient_version(void)
 
 	if (prefixcmp(buffer.buf, "emacsclient")) {
 		fprintf(stderr, "Failed to parse emacsclient version.\n");
-		strbuf_release(&buffer);
-		return -1;
+		goto out;
 	}
 
 	version = atoi(buffer.buf + strlen("emacsclient"));
@@ -92,12 +95,11 @@ static int check_emacsclient_version(void)
 		fprintf(stderr,
 			"emacsclient version '%d' too old (< 22).\n",
 			version);
-		strbuf_release(&buffer);
-		return -1;
-	}
-
+	} else
+		ret = 0;
+out:
 	strbuf_release(&buffer);
-	return 0;
+	return ret;
 }
 
 static void exec_woman_emacs(const char *path, const char *page)

[tip:perf/core] perf tools: Make alias handler to check return value of strbuf

[tip-bot for Masami Hiramatsu]

Commit-ID:  70a6898fdc11272249622f77b034f47f1e9adb35
Gitweb:     http://git.kernel.org/tip/70a6898fdc11272249622f77b034f47f1e9adb35
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:47:26 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:56:52 -0300

perf tools: Make alias handler to check return value of strbuf

Make alias handler and sq_quote_argv to check the return value of strbuf
APIs.

In sq_quote_argv() calls die(), but this fix handles strbuf failure as a
special case and returns to caller, since the caller - handle_alias()
also has to check the return value of other strbuf APIs and those checks
can be merged to one if() statement.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054725.6158.84597.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/perf.c       |  8 +++++---
 tools/perf/util/quote.c | 36 ++++++++++++++++++++----------------
 tools/perf/util/quote.h |  2 +-
 3 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 83ffe7c..7970008 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -309,9 +309,11 @@ static int handle_alias(int *argcp, const char ***argv)
 			if (*argcp > 1) {
 				struct strbuf buf;
 
-				strbuf_init(&buf, PATH_MAX);
-				strbuf_addstr(&buf, alias_string);
-				sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
+				if (strbuf_init(&buf, PATH_MAX) < 0 ||
+				    strbuf_addstr(&buf, alias_string) < 0 ||
+				    sq_quote_argv(&buf, (*argv) + 1,
+						  PATH_MAX) < 0)
+					die("Failed to allocate memory.");
 				free(alias_string);
 				alias_string = buf.buf;
 			}
diff --git a/tools/perf/util/quote.c b/tools/perf/util/quote.c
index 01f0324..c6d4ee2 100644
--- a/tools/perf/util/quote.c
+++ b/tools/perf/util/quote.c
@@ -17,38 +17,42 @@ static inline int need_bs_quote(char c)
 	return (c == '\'' || c == '!');
 }
 
-static void sq_quote_buf(struct strbuf *dst, const char *src)
+static int sq_quote_buf(struct strbuf *dst, const char *src)
 {
 	char *to_free = NULL;
+	int ret;
 
 	if (dst->buf == src)
 		to_free = strbuf_detach(dst, NULL);
 
-	strbuf_addch(dst, '\'');
-	while (*src) {
+	ret = strbuf_addch(dst, '\'');
+	while (!ret && *src) {
 		size_t len = strcspn(src, "'!");
-		strbuf_add(dst, src, len);
+		ret = strbuf_add(dst, src, len);
 		src += len;
-		while (need_bs_quote(*src)) {
-			strbuf_addstr(dst, "'\\");
-			strbuf_addch(dst, *src++);
-			strbuf_addch(dst, '\'');
-		}
+		while (!ret && need_bs_quote(*src))
+			ret = strbuf_addf(dst, "'\\%c\'", *src++);
 	}
-	strbuf_addch(dst, '\'');
+	if (!ret)
+		ret = strbuf_addch(dst, '\'');
 	free(to_free);
+
+	return ret;
 }
 
-void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
+int sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
 {
-	int i;
+	int i, ret;
 
 	/* Copy into destination buffer. */
-	strbuf_grow(dst, 255);
-	for (i = 0; argv[i]; ++i) {
-		strbuf_addch(dst, ' ');
-		sq_quote_buf(dst, argv[i]);
+	ret = strbuf_grow(dst, 255);
+	for (i = 0; !ret && argv[i]; ++i) {
+		ret = strbuf_addch(dst, ' ');
+		if (ret)
+			break;
+		ret = sq_quote_buf(dst, argv[i]);
 		if (maxlen && dst->len > maxlen)
 			die("Too many or long arguments");
 	}
+	return ret;
 }
diff --git a/tools/perf/util/quote.h b/tools/perf/util/quote.h
index 3340c9c..e1ec191 100644
--- a/tools/perf/util/quote.h
+++ b/tools/perf/util/quote.h
@@ -24,6 +24,6 @@
  * sq_quote() in a real application.
  */
 
-void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
+int sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
 
 #endif /* __PERF_QUOTE_H */

[tip:perf/core] perf header: Make topology checkers to check return value of strbuf

[tip-bot for Masami Hiramatsu]

Commit-ID:  642aadaa320bf9466fd12e3c0903977410bcb731
Gitweb:     http://git.kernel.org/tip/642aadaa320bf9466fd12e3c0903977410bcb731
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:47:35 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:57:22 -0300

perf header: Make topology checkers to check return value of strbuf

Make topology checkers to check the return value of strbuf APIs so that
it can detect errors in it.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054735.6158.98650.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/header.c | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 90680ec..c6000d4 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1819,7 +1819,8 @@ static int process_cpu_topology(struct perf_file_section *section,
 
 	ph->env.nr_sibling_cores = nr;
 	size += sizeof(u32);
-	strbuf_init(&sb, 128);
+	if (strbuf_init(&sb, 128) < 0)
+		goto free_cpu;
 
 	for (i = 0; i < nr; i++) {
 		str = do_read_string(fd, ph);
@@ -1827,7 +1828,8 @@ static int process_cpu_topology(struct perf_file_section *section,
 			goto error;
 
 		/* include a NULL character at the end */
-		strbuf_add(&sb, str, strlen(str) + 1);
+		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
+			goto error;
 		size += string_size(str);
 		free(str);
 	}
@@ -1849,7 +1851,8 @@ static int process_cpu_topology(struct perf_file_section *section,
 			goto error;
 
 		/* include a NULL character at the end */
-		strbuf_add(&sb, str, strlen(str) + 1);
+		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
+			goto error;
 		size += string_size(str);
 		free(str);
 	}
@@ -1912,13 +1915,14 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
 	/* nr nodes */
 	ret = readn(fd, &nr, sizeof(nr));
 	if (ret != sizeof(nr))
-		goto error;
+		return -1;
 
 	if (ph->needs_swap)
 		nr = bswap_32(nr);
 
 	ph->env.nr_numa_nodes = nr;
-	strbuf_init(&sb, 256);
+	if (strbuf_init(&sb, 256) < 0)
+		return -1;
 
 	for (i = 0; i < nr; i++) {
 		/* node number */
@@ -1940,15 +1944,17 @@ static int process_numa_topology(struct perf_file_section *section __maybe_unuse
 			mem_free = bswap_64(mem_free);
 		}
 
-		strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
-			    node, mem_total, mem_free);
+		if (strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
+				node, mem_total, mem_free) < 0)
+			goto error;
 
 		str = do_read_string(fd, ph);
 		if (!str)
 			goto error;
 
 		/* include a NULL character at the end */
-		strbuf_add(&sb, str, strlen(str) + 1);
+		if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
+			goto error;
 		free(str);
 	}
 	ph->env.numa_nodes = strbuf_detach(&sb, NULL);
@@ -1982,7 +1988,8 @@ static int process_pmu_mappings(struct perf_file_section *section __maybe_unused
 	}
 
 	ph->env.nr_pmu_mappings = pmu_num;
-	strbuf_init(&sb, 128);
+	if (strbuf_init(&sb, 128) < 0)
+		return -1;
 
 	while (pmu_num) {
 		if (readn(fd, &type, sizeof(type)) != sizeof(type))
@@ -1994,9 +2001,11 @@ static int process_pmu_mappings(struct perf_file_section *section __maybe_unused
 		if (!name)
 			goto error;
 
-		strbuf_addf(&sb, "%u:%s", type, name);
+		if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
+			goto error;
 		/* include a NULL character at the end */
-		strbuf_add(&sb, "", 1);
+		if (strbuf_add(&sb, "", 1) < 0)
+			goto error;
 
 		if (!strcmp(name, "msr"))
 			ph->env.msr_pmu_type = type;

[tip:perf/core] perf pmu: Make pmu_formats_string to check return value of strbuf

[tip-bot for Masami Hiramatsu]

Commit-ID:  11db4e29bb50442ecef2173f325b7be4e7790025
Gitweb:     http://git.kernel.org/tip/11db4e29bb50442ecef2173f325b7be4e7790025
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:47:44 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:57:52 -0300

perf pmu: Make pmu_formats_string to check return value of strbuf

Make pmu_formats_string() to check return value of strbuf APIs so that
it can detect errors in it.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054744.6158.37810.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/pmu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index bf34468..ddb0261 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -643,20 +643,20 @@ static int pmu_resolve_param_term(struct parse_events_term *term,
 static char *pmu_formats_string(struct list_head *formats)
 {
 	struct perf_pmu_format *format;
-	char *str;
-	struct strbuf buf;
+	char *str = NULL;
+	struct strbuf buf = STRBUF_INIT;
 	unsigned i = 0;
 
 	if (!formats)
 		return NULL;
 
-	strbuf_init(&buf, 0);
 	/* sysfs exported terms */
 	list_for_each_entry(format, formats, list)
-		strbuf_addf(&buf, i++ ? ",%s" : "%s",
-			    format->name);
+		if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
+			goto error;
 
 	str = strbuf_detach(&buf, NULL);
+error:
 	strbuf_release(&buf);
 
 	return str;

[tip:perf/core] perf help: Do not use ALLOC_GROW in add_cmd_list

[tip-bot for Masami Hiramatsu]

Commit-ID:  682f4f035e0fcffce511fe77a02a0f19f0996d70
Gitweb:     http://git.kernel.org/tip/682f4f035e0fcffce511fe77a02a0f19f0996d70
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:47:53 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:58:09 -0300

perf help: Do not use ALLOC_GROW in add_cmd_list

Replace ALLOC_GROW with normal realloc code in add_cmd_list() so that it
can handle errors directly.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054752.6158.30562.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/help-unknown-cmd.c | 30 ++++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/help-unknown-cmd.c b/tools/perf/util/help-unknown-cmd.c
index 43a98a4..d62ccae 100644
--- a/tools/perf/util/help-unknown-cmd.c
+++ b/tools/perf/util/help-unknown-cmd.c
@@ -27,16 +27,27 @@ static int levenshtein_compare(const void *p1, const void *p2)
 	return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
 }
 
-static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
+static int add_cmd_list(struct cmdnames *cmds, struct cmdnames *old)
 {
-	unsigned int i;
-
-	ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc);
-
+	unsigned int i, nr = cmds->cnt + old->cnt;
+	void *tmp;
+
+	if (nr > cmds->alloc) {
+		/* Choose bigger one to alloc */
+		if (alloc_nr(cmds->alloc) < nr)
+			cmds->alloc = nr;
+		else
+			cmds->alloc = alloc_nr(cmds->alloc);
+		tmp = realloc(cmds->names, cmds->alloc * sizeof(*cmds->names));
+		if (!tmp)
+			return -1;
+		cmds->names = tmp;
+	}
 	for (i = 0; i < old->cnt; i++)
 		cmds->names[cmds->cnt++] = old->names[i];
 	zfree(&old->names);
 	old->cnt = 0;
+	return 0;
 }
 
 const char *help_unknown_cmd(const char *cmd)
@@ -52,8 +63,11 @@ const char *help_unknown_cmd(const char *cmd)
 
 	load_command_list("perf-", &main_cmds, &other_cmds);
 
-	add_cmd_list(&main_cmds, &aliases);
-	add_cmd_list(&main_cmds, &other_cmds);
+	if (add_cmd_list(&main_cmds, &aliases) < 0 ||
+	    add_cmd_list(&main_cmds, &other_cmds) < 0) {
+		fprintf(stderr, "ERROR: Failed to allocate command list for unknown command.\n");
+		goto end;
+	}
 	qsort(main_cmds.names, main_cmds.cnt,
 	      sizeof(main_cmds.names), cmdname_compare);
 	uniq(&main_cmds);
@@ -99,6 +113,6 @@ const char *help_unknown_cmd(const char *cmd)
 		for (i = 0; i < n; i++)
 			fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
 	}
-
+end:
 	exit(1);
 }

[tip:perf/core] perf tools: Remove xrealloc and ALLOC_GROW

[tip-bot for Masami Hiramatsu]

Commit-ID:  452e84012595d681f254a3a0d733fb0b18ffaf42
Gitweb:     http://git.kernel.org/tip/452e84012595d681f254a3a0d733fb0b18ffaf42
Author:     Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate: Tue, 10 May 2016 14:48:01 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 10 May 2016 11:58:27 -0300

perf tools: Remove xrealloc and ALLOC_GROW

Remove unused xrealloc() and ALLOC_GROW() from libperf.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054801.6158.6204.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/Build     |  1 -
 tools/perf/util/cache.h   | 19 -------------------
 tools/perf/util/util.h    |  6 ------
 tools/perf/util/wrapper.c | 29 -----------------------------
 4 files changed, 55 deletions(-)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 027bb2b..8c6c8a0 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -27,7 +27,6 @@ libperf-y += strlist.o
 libperf-y += strfilter.o
 libperf-y += top.o
 libperf-y += usage.o
-libperf-y += wrapper.o
 libperf-y += dso.o
 libperf-y += symbol.o
 libperf-y += symbol_fprintf.o
diff --git a/tools/perf/util/cache.h b/tools/perf/util/cache.h
index 1f5a93c..0d814bb 100644
--- a/tools/perf/util/cache.h
+++ b/tools/perf/util/cache.h
@@ -40,25 +40,6 @@ int split_cmdline(char *cmdline, const char ***argv);
 
 #define alloc_nr(x) (((x)+16)*3/2)
 
-/*
- * Realloc the buffer pointed at by variable 'x' so that it can hold
- * at least 'nr' entries; the number of entries currently allocated
- * is 'alloc', using the standard growing factor alloc_nr() macro.
- *
- * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
- */
-#define ALLOC_GROW(x, nr, alloc) \
-	do { \
-		if ((nr) > alloc) { \
-			if (alloc_nr(alloc) < (nr)) \
-				alloc = (nr); \
-			else \
-				alloc = alloc_nr(alloc); \
-			x = xrealloc((x), alloc * sizeof(*(x))); \
-		} \
-	} while(0)
-
-
 static inline int is_absolute_path(const char *path)
 {
 	return path[0] == '/';
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 88f607a..7651633 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -160,12 +160,6 @@ static inline char *gitstrchrnul(const char *s, int c)
 }
 #endif
 
-/*
- * Wrappers:
- */
-void *xrealloc(void *ptr, size_t size) __attribute__((weak));
-
-
 static inline void *zalloc(size_t size)
 {
 	return calloc(1, size);
diff --git a/tools/perf/util/wrapper.c b/tools/perf/util/wrapper.c
deleted file mode 100644
index 5f1a07c..0000000
--- a/tools/perf/util/wrapper.c
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * Various trivial helper wrappers around standard functions
- */
-#include "cache.h"
-
-/*
- * There's no pack memory to release - but stay close to the Git
- * version so wrap this away:
- */
-static inline void release_pack_memory(size_t size __maybe_unused,
-				       int flag __maybe_unused)
-{
-}
-
-void *xrealloc(void *ptr, size_t size)
-{
-	void *ret = realloc(ptr, size);
-	if (!ret && !size)
-		ret = realloc(ptr, 1);
-	if (!ret) {
-		release_pack_memory(size, -1);
-		ret = realloc(ptr, size);
-		if (!ret && !size)
-			ret = realloc(ptr, 1);
-		if (!ret)
-			die("Out of memory, realloc failed");
-	}
-	return ret;
-}