migration: Replace migration's JSON writer by the general one

Commit 8118f0950f "migration: Append JSON description of migration
stream" needs a JSON writer.  The existing qobject_to_json() wasn't a
good fit, because it requires building a QObject to convert.  Instead,
migration got its very own JSON writer, in commit 190c882ce2 "QJSON:
Add JSON writer".  It tacitly limits numbers to int64_t, and strings
contents to characters that don't need escaping, unlike
qobject_to_json().

The previous commit factored the JSON writer out of qobject_to_json().
Replace migration's JSON writer by it.

Cc: Juan Quintela <quintela@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201211171152.146877-17-armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

3 files changed, 6 insertions, 7 deletions

diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
index 4d71dc8fba..075ee80096 100644
--- a/include/migration/vmstate.h
+++ b/include/migration/vmstate.h
@@ -43,7 +43,7 @@ struct VMStateInfo {
     const char *name;
     int (*get)(QEMUFile *f, void *pv, size_t size, const VMStateField *field);
     int (*put)(QEMUFile *f, void *pv, size_t size, const VMStateField *field,
-               QJSON *vmdesc);
+               JSONWriter *vmdesc);
 };
 
 enum VMStateFlags {
@@ -1169,9 +1169,10 @@ extern const VMStateInfo vmstate_info_qlist;
 int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd,
                        void *opaque, int version_id);
 int vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
-                       void *opaque, QJSON *vmdesc);
+                       void *opaque, JSONWriter *vmdesc);
 int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
-                         void *opaque, QJSON *vmdesc, int version_id);
+                         void *opaque, JSONWriter *vmdesc,
+                         int version_id);
 
 bool vmstate_save_needed(const VMStateDescription *vmsd, void *opaque);
 
diff --git a/include/qapi/qmp/json-writer.h b/include/qapi/qmp/json-writer.h
index 708d129018..b70ba64077 100644
--- a/include/qapi/qmp/json-writer.h
+++ b/include/qapi/qmp/json-writer.h
@@ -14,8 +14,6 @@
 #ifndef JSON_WRITER_H
 #define JSON_WRITER_H
 
-typedef struct JSONWriter JSONWriter;
-
 JSONWriter *json_writer_new(bool pretty);
 const char *json_writer_get(JSONWriter *);
 GString *json_writer_get_and_free(JSONWriter *);
diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
index 6281eae3b5..976b529dfb 100644
--- a/include/qemu/typedefs.h
+++ b/include/qemu/typedefs.h
@@ -57,8 +57,8 @@ typedef struct IOMMUMemoryRegion IOMMUMemoryRegion;
 typedef struct ISABus ISABus;
 typedef struct ISADevice ISADevice;
 typedef struct IsaDma IsaDma;
+typedef struct JSONWriter JSONWriter;
 typedef struct MACAddr MACAddr;
-typedef struct ReservedRegion ReservedRegion;
 typedef struct MachineClass MachineClass;
 typedef struct MachineState MachineState;
 typedef struct MemoryListener MemoryListener;
@@ -107,7 +107,6 @@ typedef struct QEMUSGList QEMUSGList;
 typedef struct QemuSpin QemuSpin;
 typedef struct QEMUTimer QEMUTimer;
 typedef struct QEMUTimerListGroup QEMUTimerListGroup;
-typedef struct QJSON QJSON;
 typedef struct QList QList;
 typedef struct QNull QNull;
 typedef struct QNum QNum;
@@ -115,6 +114,7 @@ typedef struct QObject QObject;
 typedef struct QString QString;
 typedef struct RAMBlock RAMBlock;
 typedef struct Range Range;
+typedef struct ReservedRegion ReservedRegion;
 typedef struct SavedIOTLB SavedIOTLB;
 typedef struct SHPCDevice SHPCDevice;
 typedef struct SSIBus SSIBus;