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m_config: untangle new and old code somewhat

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The original MPlayer m_config was essentially only responsible for
handling some command line parsing details, handling profiles, and
file-local options. And then there's the new mpv stuff (that stuff was
regretfully written by me), which is mostly associated with making
things thread-safe (includes things like making it all library-safe,
instead of stuffing all option data into global variables).

This commit tries to separate them some more. For example,
m_config_shadow (the thread-safe thing) now does not need access to
m_config anymore. m_config can hopefully be reduced to handling only the
"old" mplayer-derived mechanisms.
This commit is contained in:
wm4 2019-11-28 23:37:08 +01:00
parent f73881fa10
commit 5083db91eb
1 changed files with 177 additions and 75 deletions
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252
options/m_config.c
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@ -53,9 +53,11 @@ static const union m_option_value default_value;
// Maximal include depth.
#define MAX_RECURSION_DEPTH 8
// Maximum possibly option name length (as it appears to the user).
#define MAX_OPT_NAME_LEN 80
// For use with m_config_cache.
struct m_config_shadow {
struct m_config *root;
pthread_mutex_t lock;
// Incremented on every option change.
mp_atomic_uint64 ts;
@ -83,6 +85,8 @@ struct m_config_group {
// or -1 for group 0
int parent_ptr; // ptr offset in the parent group's data, or -1 if
// none
const char *prefix; // concat_name(_, prefix, opt->name) => full name
// (the parent names are already included in this)
};
// A copy of option data. Used for the main option struct, the shadow data,
@ -138,7 +142,7 @@ struct m_opt_backup {
void *backup;
};
static void add_sub_group(struct m_config *config, const char *name_prefix,
static void add_sub_group(struct m_config_shadow *shadow, const char *name_prefix,
int parent_group_index, int parent_ptr,
const struct m_sub_options *subopts);
@ -152,6 +156,92 @@ static struct m_group_data *m_config_gdata(struct m_config_data *data,
return &data->gdata[group_index - data->group_index];
}
// Like concat_name(), but returns either a, b, or buf. buf/buf_size is used as
// target for snprintf(). (buf_size is recommended to be MAX_OPT_NAME_LEN.)
static const char *concat_name_buf(char *buf, size_t buf_size,
const char *a, const char *b)
{
assert(a);
assert(b);
if (!a[0])
return b;
if (!b[0])
return a;
snprintf(buf, buf_size, "%s-%s", a, b);
return buf;
}
// Return full option name from prefix (a) and option name (b). Returns either
// a, b, or a talloc'ed string under ta_parent.
static const char *concat_name(void *ta_parent, const char *a, const char *b)
{
char buf[MAX_OPT_NAME_LEN];
const char *r = concat_name_buf(buf, sizeof(buf), a, b);
return r == buf ? talloc_strdup(ta_parent, r) : r;
}
struct opt_iterate_state {
// User can read these fields.
int group_index;
int opt_index;
const struct m_option *opt;
const char *full_name; // may point to name_buf
// Internal.
int group_index_end;
char name_buf[MAX_OPT_NAME_LEN];
struct m_config_shadow *shadow;
};
// Start iterating all options and sub-options in the given group.
static void opt_iterate_init(struct opt_iterate_state *iter,
struct m_config_shadow *shadow, int group_index)
{
assert(group_index >= 0 && group_index < shadow->num_groups);
iter->group_index = group_index;
iter->group_index_end = group_index + shadow->groups[group_index].group_count;
iter->opt_index = -1;
iter->shadow = shadow;
}
// Get the first or next option. Returns false if end reached. If this returns
// true, most fields in *iter are valid.
// This does not return pseudo-option entries (like m_option_type_subconfig).
static bool opt_iterate_next(struct opt_iterate_state *iter)
{
if (iter->group_index < 0)
return false;
while (1) {
if (iter->group_index >= iter->group_index_end) {
iter->group_index = -1;
return false;
}
iter->opt_index += 1;
struct m_config_group *g = &iter->shadow->groups[iter->group_index];
const struct m_option *opts = g->group->opts;
if (!opts || !opts[iter->opt_index].name) {
iter->group_index += 1;
iter->opt_index = -1;
continue;
}
iter->opt = &opts[iter->opt_index];
if (iter->opt->type == &m_option_type_subconfig)
continue;
iter->full_name = concat_name_buf(iter->name_buf, sizeof(iter->name_buf),
g->prefix, iter->opt->name);
return true;
}
assert(0);
}
static void list_profiles(struct m_config *config)
{
MP_INFO(config, "Available profiles:\n");
@ -324,20 +414,40 @@ static struct m_config_data *allocate_option_data(void *ta_parent,
return data;
}
static void shadow_destroy(void *p)
{
struct m_config_shadow *shadow = p;
// must all have been unregistered
assert(shadow->num_listeners == 0);
talloc_free(shadow->data);
pthread_mutex_destroy(&shadow->lock);
}
static struct m_config_shadow *m_config_shadow_new(const struct m_sub_options *root)
{
struct m_config_shadow *shadow = talloc_zero(NULL, struct m_config_shadow);
talloc_set_destructor(shadow, shadow_destroy);
pthread_mutex_init(&shadow->lock, NULL);
add_sub_group(shadow, NULL, -1, -1, root);
if (!root->size)
return shadow;
shadow->data = allocate_option_data(shadow, shadow, 0, NULL);
return shadow;
}
static void config_destroy(void *p)
{
struct m_config *config = p;
m_config_restore_backups(config);
talloc_free(config->data);
if (config->shadow) {
// must all have been unregistered
assert(config->shadow->num_listeners == 0);
talloc_free(config->shadow->data);
pthread_mutex_destroy(&config->shadow->lock);
talloc_free(config->shadow);
}
talloc_free(config->shadow);
}
struct m_config *m_config_new(void *talloc_ctx, struct mp_log *log,
@ -348,32 +458,38 @@ struct m_config *m_config_new(void *talloc_ctx, struct mp_log *log,
talloc_set_destructor(config, config_destroy);
*config = (struct m_config){.log = log,};
config->shadow = talloc_zero(NULL, struct m_config_shadow);
pthread_mutex_init(&config->shadow->lock, NULL);
config->shadow->root = config;
struct m_sub_options *subopts = talloc_ptrtype(config, subopts);
*subopts = (struct m_sub_options){
.opts = options,
.size = size,
.defaults = defaults,
};
add_sub_group(config, NULL, -1, -1, subopts);
if (!size)
return config;
config->shadow = m_config_shadow_new(subopts);
config->data = allocate_option_data(config, config->shadow, 0, NULL);
config->optstruct = config->data->gdata[0].udata;
if (size) {
config->data = allocate_option_data(config, config->shadow, 0,
config->shadow->data);
config->optstruct = config->data->gdata[0].udata;
}
config->shadow->data =
allocate_option_data(config->shadow, config->shadow, 0, config->data);
struct opt_iterate_state it;
opt_iterate_init(&it, config->shadow, 0);
while (opt_iterate_next(&it)) {
struct m_config_option co = {
.name = talloc_strdup(config, it.full_name),
.opt = it.opt,
.group_index = it.group_index,
.is_hidden = !!it.opt->deprecation_message,
};
for (int n = 0; n < config->num_opts; n++) {
struct m_config_option *co = &config->opts[n];
struct m_group_data *gdata = m_config_gdata(config->data, co->group_index);
if (gdata && co->opt->offset >= 0)
co->data = gdata->udata + co->opt->offset;
struct m_group_data *gdata =
config->data ? m_config_gdata(config->data, it.group_index) : NULL;
if (gdata && co.opt->offset >= 0)
co.data = gdata->udata + co.opt->offset;
MP_TARRAY_APPEND(config, config->opts, config->num_opts, co);
}
return config;
@ -513,7 +629,7 @@ void m_config_backup_all_opts(struct m_config *config)
ensure_backup(config, &config->opts[n]);
}
static void init_obj_settings_list(struct m_config *config,
static void init_obj_settings_list(struct m_config_shadow *shadow,
int parent_group_index,
const struct m_obj_list *list)
{
@ -522,43 +638,37 @@ static void init_obj_settings_list(struct m_config *config,
if (!list->get_desc(&desc, n))
break;
if (desc.global_opts) {
add_sub_group(config, NULL, parent_group_index, -1,
add_sub_group(shadow, NULL, parent_group_index, -1,
desc.global_opts);
}
if (list->use_global_options && desc.options) {
struct m_sub_options *conf = talloc_ptrtype(config, conf);
struct m_sub_options *conf = talloc_ptrtype(shadow, conf);
*conf = (struct m_sub_options){
.prefix = desc.options_prefix,
.opts = desc.options,
.defaults = desc.priv_defaults,
.size = desc.priv_size,
};
add_sub_group(config, NULL, parent_group_index, -1, conf);
add_sub_group(shadow, NULL, parent_group_index, -1, conf);
}
}
}
static const char *concat_name(void *ta_parent, const char *a, const char *b)
{
assert(a);
assert(b);
if (!a[0])
return b;
if (!b[0])
return a;
return talloc_asprintf(ta_parent, "%s-%s", a, b);
}
static void add_sub_group(struct m_config *config, const char *name_prefix,
static void add_sub_group(struct m_config_shadow *shadow, const char *name_prefix,
int parent_group_index, int parent_ptr,
const struct m_sub_options *subopts)
{
struct m_config_shadow *shadow = config->shadow;
// Can't be used multiple times.
for (int n = 0; n < shadow->num_groups; n++)
assert(shadow->groups[n].group != subopts);
if (!name_prefix)
name_prefix = "";
if (subopts->prefix && subopts->prefix[0]) {
assert(!name_prefix[0]);
name_prefix = subopts->prefix;
}
// You can only use UPDATE_ flags here.
assert(!(subopts->change_flags & ~(unsigned)UPDATE_OPTS_MASK));
@ -570,15 +680,9 @@ static void add_sub_group(struct m_config *config, const char *name_prefix,
.group = subopts,
.parent_group = parent_group_index,
.parent_ptr = parent_ptr,
.prefix = name_prefix,
};
if (!name_prefix)
name_prefix = "";
if (subopts->prefix && subopts->prefix[0]) {
assert(!name_prefix[0]);
name_prefix = subopts->prefix;
}
for (int i = 0; subopts->opts && subopts->opts[i].name; i++) {
const struct m_option *opt = &subopts->opts[i];
@ -591,23 +695,12 @@ static void add_sub_group(struct m_config *config, const char *name_prefix,
assert(!substruct_read_ptr(ptr));
}
const char *prefix = concat_name(config, name_prefix, opt->name);
add_sub_group(config, prefix, group_index, opt->offset, new_subopts);
const char *prefix = concat_name(shadow, name_prefix, opt->name);
add_sub_group(shadow, prefix, group_index, opt->offset, new_subopts);
} else {
struct m_config_option co = {
.name = concat_name(config, name_prefix, opt->name),
.opt = opt,
.group_index = group_index,
.is_hidden = !!opt->deprecation_message,
};
MP_TARRAY_APPEND(config, config->opts, config->num_opts, co);
if (opt->type == &m_option_type_obj_settings_list) {
const struct m_obj_list *objlist = opt->priv;
init_obj_settings_list(config, group_index, objlist);
}
} else if (opt->type == &m_option_type_obj_settings_list) {
const struct m_obj_list *objlist = opt->priv;
init_obj_settings_list(shadow, group_index, objlist);
}
}
@ -1613,14 +1706,23 @@ void mp_read_option_raw(struct mpv_global *global, const char *name,
const struct m_option_type *type, void *dst)
{
struct m_config_shadow *shadow = global->config;
struct m_config_option *co = m_config_get_co_raw(shadow->root, bstr0(name));
assert(co);
assert(co->opt->offset >= 0);
assert(co->opt->type == type);
struct m_group_data *gdata = m_config_gdata(shadow->data, co->group_index);
assert(gdata);
struct opt_iterate_state it;
opt_iterate_init(&it, shadow, 0);
while (opt_iterate_next(&it)) {
if (strcmp(name, it.full_name) == 0) {
struct m_group_data *gdata =
m_config_gdata(shadow->data, it.group_index);
assert(gdata);
memset(dst, 0, co->opt->type->size);
m_option_copy(co->opt, dst, gdata->udata + co->opt->offset);
assert(it.opt->offset >= 0);
assert(it.opt->type == type);
memset(dst, 0, it.opt->type->size);
m_option_copy(it.opt, dst, gdata->udata + it.opt->offset);
return;
}
}
assert(0); // not found
}