[PATCH v3 1/7] perf config: Introduce default_config_item for default config key-value pairs

[Taeung Song]

When initializing default perf config values,
we currently use values of actual type(int, bool, char *, etc.).

For example,
If there isn't user config value at ~/.perfconfig
for 'annotate.use_offset' config variable,
default value for it is 'true' bool type value in perf like below.

At ui/browsers/annoate.c

static struct annotate_browser_opt {
       bool hide_src_code,
            use_offset,
            jump_arrows,
            show_linenr,
            show_nr_jumps,
            show_total_period;
} annotate_browser__opts = {
       .use_offset      = true,
       .jump_arrows     = true,
};

By the way, I suggest using 'struct default_config_item' that
have default config key-value pairs and then initializing
default config values with them, in near future.
Because if we do, we can manage default perf config values
at one spot (like util/config.c) with default config arrays
and It can be easy and simple to modify default config values or add new 
configs.

Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Wang Nan <wangn...@huawei.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Masami Hiramatsu <mhira...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Signed-off-by: Taeung Song <treeze.tae...@gmail.com>
---
 tools/perf/util/config.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/tools/perf/util/config.h b/tools/perf/util/config.h
index 22ec626..5a11ca6 100644
--- a/tools/perf/util/config.h
+++ b/tools/perf/util/config.h
@@ -4,6 +4,30 @@
 #include <stdbool.h>
 #include <linux/list.h>
 
+enum perf_config_type {
+       CONFIG_TYPE_BOOL,
+       CONFIG_TYPE_INT,
+       CONFIG_TYPE_LONG,
+       CONFIG_TYPE_U64,
+       CONFIG_TYPE_FLOAT,
+       CONFIG_TYPE_DOUBLE,
+       CONFIG_TYPE_STRING
+};
+
+struct default_config_item {
+       const char *name;
+       union {
+               bool b;
+               int i;
+               u32 l;
+               u64 ll;
+               float f;
+               double d;
+               const char *s;
+       } value;
+       enum perf_config_type type;
+};
+
 struct perf_config_item {
        char *name;
        char *value;
@@ -20,6 +44,26 @@ struct perf_config_set {
        struct list_head sections;
 };
 
+#define CONF_VAR(_name, _field, _val, _type)                   \
+       { .name = _name, .value._field = _val, .type = _type }
+
+#define CONF_BOOL_VAR(_name, _val)                     \
+       CONF_VAR(_name, b, _val, CONFIG_TYPE_BOOL)
+#define CONF_INT_VAR(_name, _val)                      \
+       CONF_VAR(_name, i, _val, CONFIG_TYPE_INT)
+#define CONF_LONG_VAR(_name, _val)                     \
+       CONF_VAR(_name, l, _val, CONFIG_TYPE_LONG)
+#define CONF_U64_VAR(_name, _val)                      \
+       CONF_VAR(_name, ll, _val, CONFIG_TYPE_U64)
+#define CONF_FLOAT_VAR(_name, _val)                    \
+       CONF_VAR(_name, f, _val, CONFIG_TYPE_FLOAT)
+#define CONF_DOUBLE_VAR(_name, _val)                   \
+       CONF_VAR(_name, d, _val, CONFIG_TYPE_DOUBLE)
+#define CONF_STR_VAR(_name, _val)                      \
+       CONF_VAR(_name, s, _val, CONFIG_TYPE_STRING)
+#define CONF_END()                                     \
+       { .name = NULL }
+
 struct perf_config_set *perf_config_set__new(void);
 void perf_config_set__delete(struct perf_config_set *set);
 
-- 
2.5.0