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perf list: JSON escape encoding improvements 

Use strbuf to make the string under construction's length unlimited. Use
the format %s to mean a literal string copy and %S to signify a need to
escape the string. Add supported for escaping a newline character.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xin Gao <gaoxin@cdjrlc.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20221118024607.409083-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2022-11-17 18:46:06 -08:00 committed by Arnaldo Carvalho de Melo
parent 1a9c20b45d
commit 1284ded7d0
1 changed files with 67 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

89
tools/perf/builtin-list.c
View File

@ -17,6 +17,7 @@
#include "util/metricgroup.h"
#include "util/string2.h"
#include "util/strlist.h"
#include "util/strbuf.h"
#include <subcmd/pager.h>
#include <subcmd/parse-options.h>
#include <linux/zalloc.h>
@ -250,45 +251,56 @@ static void json_print_end(void *ps)
printf("%s]\n", print_state->need_sep ? "\n" : "");
}
static void fix_escape_printf(const char *fmt, ...)
static void fix_escape_printf(struct strbuf *buf, const char *fmt, ...)
{
va_list args;
char buf[2048];
size_t buf_pos = 0;
va_start(args, fmt);
strbuf_setlen(buf, 0);
for (size_t fmt_pos = 0; fmt_pos < strlen(fmt); fmt_pos++) {
switch (fmt[fmt_pos]) {
case '%': {
case '%':
fmt_pos++;
switch (fmt[fmt_pos]) {
case 's': {
const char *s = va_arg(args, const char*);
strbuf_addstr(buf, s);
break;
}
case 'S': {
const char *s = va_arg(args, const char*);
fmt_pos++;
assert(fmt[fmt_pos] == 's');
for (size_t s_pos = 0; s_pos < strlen(s); s_pos++) {
switch (s[s_pos]) {
case '\n':
strbuf_addstr(buf, "\\n");
break;
case '\\':
__fallthrough;
case '\"':
buf[buf_pos++] = '\\';
assert(buf_pos < sizeof(buf));
strbuf_addch(buf, '\\');
__fallthrough;
default:
buf[buf_pos++] = s[s_pos];
assert(buf_pos < sizeof(buf));
strbuf_addch(buf, s[s_pos]);
break;
}
}
break;
}
default:
buf[buf_pos++] = fmt[fmt_pos];
assert(buf_pos < sizeof(buf));
pr_err("Unexpected format character '%c'\n", fmt[fmt_pos]);
strbuf_addch(buf, '%');
strbuf_addch(buf, fmt[fmt_pos]);
}
break;
default:
strbuf_addch(buf, fmt[fmt_pos]);
break;
}
}
va_end(args);
buf[buf_pos] = '\0';
fputs(buf, stdout);
fputs(buf->buf, stdout);
}
static void json_print_event(void *ps, const char *pmu_name, const char *topic,
@ -301,62 +313,71 @@ static void json_print_event(void *ps, const char *pmu_name, const char *topic,
{
struct json_print_state *print_state = ps;
bool need_sep = false;
struct strbuf buf;
strbuf_init(&buf, 0);
printf("%s{\n", print_state->need_sep ? ",\n" : "");
print_state->need_sep = true;
if (pmu_name) {
fix_escape_printf("\t\"Unit\": \"%s\"", pmu_name);
fix_escape_printf(&buf, "\t\"Unit\": \"%S\"", pmu_name);
need_sep = true;
}
if (topic) {
fix_escape_printf("%s\t\"Topic\": \"%s\"", need_sep ? ",\n" : "", topic);
fix_escape_printf(&buf, "%s\t\"Topic\": \"%S\"", need_sep ? ",\n" : "", topic);
need_sep = true;
}
if (event_name) {
fix_escape_printf("%s\t\"EventName\": \"%s\"", need_sep ? ",\n" : "", event_name);
fix_escape_printf(&buf, "%s\t\"EventName\": \"%S\"", need_sep ? ",\n" : "",
event_name);
need_sep = true;
}
if (event_alias && strlen(event_alias)) {
fix_escape_printf("%s\t\"EventAlias\": \"%s\"", need_sep ? ",\n" : "", event_alias);
fix_escape_printf(&buf, "%s\t\"EventAlias\": \"%S\"", need_sep ? ",\n" : "",
event_alias);
need_sep = true;
}
if (scale_unit && strlen(scale_unit)) {
fix_escape_printf("%s\t\"ScaleUnit\": \"%s\"", need_sep ? ",\n" : "",
fix_escape_printf(&buf, "%s\t\"ScaleUnit\": \"%S\"", need_sep ? ",\n" : "",
scale_unit);
need_sep = true;
}
if (event_type_desc) {
fix_escape_printf("%s\t\"EventType\": \"%s\"", need_sep ? ",\n" : "",
fix_escape_printf(&buf, "%s\t\"EventType\": \"%S\"", need_sep ? ",\n" : "",
event_type_desc);
need_sep = true;
}
if (deprecated) {
fix_escape_printf("%s\t\"Deprecated\": \"%s\"", need_sep ? ",\n" : "",
fix_escape_printf(&buf, "%s\t\"Deprecated\": \"%S\"", need_sep ? ",\n" : "",
deprecated ? "1" : "0");
need_sep = true;
}
if (desc) {
fix_escape_printf("%s\t\"BriefDescription\": \"%s\"", need_sep ? ",\n" : "", desc);
fix_escape_printf(&buf, "%s\t\"BriefDescription\": \"%S\"", need_sep ? ",\n" : "",
desc);
need_sep = true;
}
if (long_desc) {
fix_escape_printf("%s\t\"PublicDescription\": \"%s\"", need_sep ? ",\n" : "",
fix_escape_printf(&buf, "%s\t\"PublicDescription\": \"%S\"", need_sep ? ",\n" : "",
long_desc);
need_sep = true;
}
if (encoding_desc) {
fix_escape_printf("%s\t\"Encoding\": \"%s\"", need_sep ? ",\n" : "", encoding_desc);
fix_escape_printf(&buf, "%s\t\"Encoding\": \"%S\"", need_sep ? ",\n" : "",
encoding_desc);
need_sep = true;
}
if (metric_name) {
fix_escape_printf("%s\t\"MetricName\": \"%s\"", need_sep ? ",\n" : "", metric_name);
fix_escape_printf(&buf, "%s\t\"MetricName\": \"%S\"", need_sep ? ",\n" : "",
metric_name);
need_sep = true;
}
if (metric_expr) {
fix_escape_printf("%s\t\"MetricExpr\": \"%s\"", need_sep ? ",\n" : "", metric_expr);
fix_escape_printf(&buf, "%s\t\"MetricExpr\": \"%S\"", need_sep ? ",\n" : "",
metric_expr);
need_sep = true;
}
printf("%s}", need_sep ? "\n" : "");
strbuf_release(&buf);
}
static void json_print_metric(void *ps __maybe_unused, const char *group,
@ -366,35 +387,39 @@ static void json_print_metric(void *ps __maybe_unused, const char *group,
{
struct json_print_state *print_state = ps;
bool need_sep = false;
struct strbuf buf;
strbuf_init(&buf, 0);
printf("%s{\n", print_state->need_sep ? ",\n" : "");
print_state->need_sep = true;
if (group) {
fix_escape_printf("\t\"MetricGroup\": \"%s\"", group);
fix_escape_printf(&buf, "\t\"MetricGroup\": \"%S\"", group);
need_sep = true;
}
if (name) {
fix_escape_printf("%s\t\"MetricName\": \"%s\"", need_sep ? ",\n" : "", name);
fix_escape_printf(&buf, "%s\t\"MetricName\": \"%S\"", need_sep ? ",\n" : "", name);
need_sep = true;
}
if (expr) {
fix_escape_printf("%s\t\"MetricExpr\": \"%s\"", need_sep ? ",\n" : "", expr);
fix_escape_printf(&buf, "%s\t\"MetricExpr\": \"%S\"", need_sep ? ",\n" : "", expr);
need_sep = true;
}
if (unit) {
fix_escape_printf("%s\t\"ScaleUnit\": \"%s\"", need_sep ? ",\n" : "", unit);
fix_escape_printf(&buf, "%s\t\"ScaleUnit\": \"%S\"", need_sep ? ",\n" : "", unit);
need_sep = true;
}
if (desc) {
fix_escape_printf("%s\t\"BriefDescription\": \"%s\"", need_sep ? ",\n" : "", desc);
fix_escape_printf(&buf, "%s\t\"BriefDescription\": \"%S\"", need_sep ? ",\n" : "",
desc);
need_sep = true;
}
if (long_desc) {
fix_escape_printf("%s\t\"PublicDescription\": \"%s\"", need_sep ? ",\n" : "",
fix_escape_printf(&buf, "%s\t\"PublicDescription\": \"%S\"", need_sep ? ",\n" : "",
long_desc);
need_sep = true;
}
printf("%s}", need_sep ? "\n" : "");
strbuf_release(&buf);
}
int cmd_list(int argc, const char **argv)