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Subject[PATCH v4 1/3] perf probe: Remove length limitation for showing available variables
Date
Use struct strbuf instead of bare char[] to remove the length limitation
of variables in variable_list, so they will not disappear due to
overlength, and make preparation for adding more description for
variables.

Signed-off-by: He Kuang <hekuang@huawei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
tools/perf/util/dwarf-aux.c | 50 +++++++++++++++++++-----------------------
tools/perf/util/dwarf-aux.h | 4 ++--
tools/perf/util/probe-finder.c | 17 ++++++++------
3 files changed, 34 insertions(+), 37 deletions(-)

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index 16d46e2..737c9db 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -848,19 +848,17 @@ Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
/**
* die_get_typename - Get the name of given variable DIE
* @vr_die: a variable DIE
- * @buf: a buffer for result type name
- * @len: a max-length of @buf
+ * @buf: a strbuf for result type name
*
- * Get the name of @vr_die and stores it to @buf. Return the actual length
- * of type name if succeeded. Return -E2BIG if @len is not enough long, and
- * Return -ENOENT if failed to find type name.
+ * Get the name of @vr_die and stores it to @buf. Return 0 if succeeded.
+ * and Return -ENOENT if failed to find type name.
* Note that the result will stores typedef name if possible, and stores
* "*(function_type)" if the type is a function pointer.
*/
-int die_get_typename(Dwarf_Die *vr_die, char *buf, int len)
+int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf)
{
Dwarf_Die type;
- int tag, ret, ret2;
+ int tag, ret;
const char *tmp = "";

if (__die_get_real_type(vr_die, &type) == NULL)
@@ -871,8 +869,8 @@ int die_get_typename(Dwarf_Die *vr_die, char *buf, int len)
tmp = "*";
else if (tag == DW_TAG_subroutine_type) {
/* Function pointer */
- ret = snprintf(buf, len, "(function_type)");
- return (ret >= len) ? -E2BIG : ret;
+ strbuf_addf(buf, "(function_type)");
+ return 0;
} else {
if (!dwarf_diename(&type))
return -ENOENT;
@@ -883,39 +881,35 @@ int die_get_typename(Dwarf_Die *vr_die, char *buf, int len)
else if (tag == DW_TAG_enumeration_type)
tmp = "enum ";
/* Write a base name */
- ret = snprintf(buf, len, "%s%s", tmp, dwarf_diename(&type));
- return (ret >= len) ? -E2BIG : ret;
- }
- ret = die_get_typename(&type, buf, len);
- if (ret > 0) {
- ret2 = snprintf(buf + ret, len - ret, "%s", tmp);
- ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret;
+ strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
+ return 0;
}
+ ret = die_get_typename(&type, buf);
+ if (ret == 0)
+ strbuf_addf(buf, "%s", tmp);
+
return ret;
}

/**
* die_get_varname - Get the name and type of given variable DIE
* @vr_die: a variable DIE
- * @buf: a buffer for type and variable name
- * @len: the max-length of @buf
+ * @buf: a strbuf for type and variable name
*
* Get the name and type of @vr_die and stores it in @buf as "type\tname".
*/
-int die_get_varname(Dwarf_Die *vr_die, char *buf, int len)
+int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
{
- int ret, ret2;
+ int ret;

- ret = die_get_typename(vr_die, buf, len);
+ ret = die_get_typename(vr_die, buf);
if (ret < 0) {
pr_debug("Failed to get type, make it unknown.\n");
- ret = snprintf(buf, len, "(unknown_type)");
- }
- if (ret > 0) {
- ret2 = snprintf(buf + ret, len - ret, "\t%s",
- dwarf_diename(vr_die));
- ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret;
+ strbuf_addf(buf, "(unknown_type)");
}
- return ret;
+
+ strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
+
+ return 0;
}

diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h
index 50a3cdc..60676fd 100644
--- a/tools/perf/util/dwarf-aux.h
+++ b/tools/perf/util/dwarf-aux.h
@@ -117,8 +117,8 @@ extern Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
Dwarf_Die *die_mem);

/* Get the name of given variable DIE */
-extern int die_get_typename(Dwarf_Die *vr_die, char *buf, int len);
+extern int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf);

/* Get the name and type of given variable DIE, stored as "type\tname" */
-extern int die_get_varname(Dwarf_Die *vr_die, char *buf, int len);
+extern int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf);
#endif
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index d5f60c0..dcca551 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1253,14 +1253,11 @@ int debuginfo__find_trace_events(struct debuginfo *dbg,
return (ret < 0) ? ret : tf.ntevs;
}

-#define MAX_VAR_LEN 64
-
/* Collect available variables in this scope */
static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
{
struct available_var_finder *af = data;
struct variable_list *vl;
- char buf[MAX_VAR_LEN];
int tag, ret;

vl = &af->vls[af->nvls - 1];
@@ -1272,10 +1269,16 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
af->pf.fb_ops, &af->pf.sp_die,
NULL);
if (ret == 0) {
- ret = die_get_varname(die_mem, buf, MAX_VAR_LEN);
- pr_debug2("Add new var: %s\n", buf);
- if (ret > 0)
- strlist__add(vl->vars, buf);
+ struct strbuf buf;
+
+ strbuf_init(&buf, 64);
+ ret = die_get_varname(die_mem, &buf);
+ pr_debug2("Add new var: %s\n", buf.buf);
+ if (ret == 0) {
+ strlist__add(vl->vars,
+ strbuf_detach(&buf, NULL));
+ }
+ strbuf_release(&buf);
}
}

--
1.8.5.2


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