monitor: Split Monitor.flags into separate bools

Monitor.flags contains three different flags: One to distinguish HMP
from QMP; one specific to HMP (MONITOR_USE_READLINE) that is ignored
with QMP; and another one specific to QMP (MONITOR_USE_PRETTY) that is
ignored with HMP.

Split the flags field into three bools and move them to the right
subclass. Flags are still in use for the monitor_init() interface.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20190613153405.24769-14-kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

monitor/hmp.c

@@ -1398,12 +1398,12 @@ static void monitor_readline_flush(void *opaque)
 void monitor_init_hmp(Chardev *chr, int flags)
 {
     MonitorHMP *mon = g_new0(MonitorHMP, 1);
-    bool use_readline = flags & MONITOR_USE_READLINE;
 
-    monitor_data_init(&mon->common, flags, false, false);
+    monitor_data_init(&mon->common, false, false, false);
     qemu_chr_fe_init(&mon->common.chr, chr, &error_abort);
 
-    if (use_readline) {
+    mon->use_readline = flags & MONITOR_USE_READLINE;
+    if (mon->use_readline) {
         mon->rs = readline_init(monitor_readline_printf,
                                 monitor_readline_flush,
                                 mon,

monitor/misc.c

@@ -121,7 +121,7 @@ char *qmp_human_monitor_command(const char *command_line, bool has_cpu_index,
     Monitor *old_mon;
     MonitorHMP hmp = {};
 
-    monitor_data_init(&hmp.common, 0, true, false);
+    monitor_data_init(&hmp.common, false, true, false);
 
     old_mon = cur_mon;
     cur_mon = &hmp.common;

monitor/monitor-internal.h

@@ -86,8 +86,8 @@ typedef struct HMPCommand {
 struct Monitor {
     CharBackend chr;
     int reset_seen;
-    int flags;
     int suspend_cnt;            /* Needs to be accessed atomically */
+    bool is_qmp;
     bool skip_flush;
     bool use_io_thread;
 
@@ -112,6 +112,7 @@ struct Monitor {
 
 struct MonitorHMP {
     Monitor common;
+    bool use_readline;
     /*
      * State used only in the thread "owning" the monitor.
      * If @use_io_thread, this is @mon_iothread. (This does not actually happen
@@ -125,6 +126,7 @@ struct MonitorHMP {
 typedef struct {
     Monitor common;
     JSONMessageParser parser;
+    bool pretty;
     /*
      * When a client connects, we're in capabilities negotiation mode.
      * @commands is &qmp_cap_negotiation_commands then.  When command
@@ -148,7 +150,7 @@ typedef struct {
  */
 static inline bool monitor_is_qmp(const Monitor *mon)
 {
-    return mon->flags & MONITOR_USE_CONTROL;
+    return mon->is_qmp;
 }
 
 typedef QTAILQ_HEAD(MonitorList, Monitor) MonitorList;
@@ -165,7 +167,7 @@ void monitor_init_qmp(Chardev *chr, int flags);
 void monitor_init_hmp(Chardev *chr, int flags);
 
 int monitor_puts(Monitor *mon, const char *str);
-void monitor_data_init(Monitor *mon, int flags, bool skip_flush,
+void monitor_data_init(Monitor *mon, bool is_qmp, bool skip_flush,
                        bool use_io_thread);
 void monitor_data_destroy(Monitor *mon);
 int monitor_can_read(void *opaque);

monitor/monitor.c

@@ -78,14 +78,18 @@ bool monitor_cur_is_qmp(void)
  * Note: not all HMP monitors use readline, e.g., gdbserver has a
  * non-interactive HMP monitor, so readline is not used there.
  */
-static inline bool monitor_uses_readline(const Monitor *mon)
+static inline bool monitor_uses_readline(const MonitorHMP *mon)
 {
-    return mon->flags & MONITOR_USE_READLINE;
+    return mon->use_readline;
 }
 
 static inline bool monitor_is_hmp_non_interactive(const Monitor *mon)
 {
-    return !monitor_is_qmp(mon) && !monitor_uses_readline(mon);
+    if (monitor_is_qmp(mon)) {
+        return false;
+    }
+
+    return !monitor_uses_readline(container_of(mon, MonitorHMP, common));
 }
 
 static void monitor_flush_locked(Monitor *mon);
@@ -521,17 +525,17 @@ static void monitor_iothread_init(void)
     mon_iothread = iothread_create("mon_iothread", &error_abort);
 }
 
-void monitor_data_init(Monitor *mon, int flags, bool skip_flush,
+void monitor_data_init(Monitor *mon, bool is_qmp, bool skip_flush,
                        bool use_io_thread)
 {
     if (use_io_thread && !mon_iothread) {
         monitor_iothread_init();
     }
     qemu_mutex_init(&mon->mon_lock);
+    mon->is_qmp = is_qmp;
     mon->outbuf = qstring_new();
     mon->skip_flush = skip_flush;
     mon->use_io_thread = use_io_thread;
-    mon->flags = flags;
 }
 
 void monitor_data_destroy(Monitor *mon)

monitor/qmp.c

@@ -87,8 +87,7 @@ void qmp_send_response(MonitorQMP *mon, const QDict *rsp)
     const QObject *data = QOBJECT(rsp);
     QString *json;
 
-    json = mon->common.flags & MONITOR_USE_PRETTY ?
+    json = mon->pretty ? qobject_to_json_pretty(data) : qobject_to_json(data);
-           qobject_to_json_pretty(data) : qobject_to_json(data);
     assert(json != NULL);
 
     qstring_append_chr(json, '\n');
@@ -373,9 +372,11 @@ void monitor_init_qmp(Chardev *chr, int flags)
     assert(!(flags & MONITOR_USE_READLINE));
 
     /* Note: we run QMP monitor in I/O thread when @chr supports that */
-    monitor_data_init(&mon->common, flags, false,
+    monitor_data_init(&mon->common, true, false,
                       qemu_chr_has_feature(chr, QEMU_CHAR_FEATURE_GCONTEXT));
 
+    mon->pretty = flags & MONITOR_USE_PRETTY;
+
     qemu_mutex_init(&mon->qmp_queue_lock);
     mon->qmp_requests = g_queue_new();