qapi: add trace events for visitor

Allow tracing of the operation of visitors

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1475246744-29302-4-git-send-email-berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[visit_type_uint8() & friends rearranged slightly for clarity]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

3 files changed, 79 insertions, 6 deletions

diff --git a/Makefile.objs b/Makefile.objs
index 69fdd48679..82e8a1e10a 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -162,3 +162,4 @@ trace-events-y += target-s390x/trace-events
 trace-events-y += target-ppc/trace-events
 trace-events-y += qom/trace-events
 trace-events-y += linux-user/trace-events
+trace-events-y += qapi/trace-events
diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index 55f5876dc0..63bd97b341 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -19,10 +19,12 @@
 #include "qapi/qmp/qerror.h"
 #include "qapi/visitor.h"
 #include "qapi/visitor-impl.h"
+#include "trace.h"
 
 void visit_complete(Visitor *v, void *opaque)
 {
     assert(v->type != VISITOR_OUTPUT || v->complete);
+    trace_visit_complete(v, opaque);
     if (v->complete) {
         v->complete(v, opaque);
     }
@@ -30,6 +32,7 @@ void visit_complete(Visitor *v, void *opaque)
 
 void visit_free(Visitor *v)
 {
+    trace_visit_free(v);
     if (v) {
         v->free(v);
     }
@@ -40,6 +43,7 @@ void visit_start_struct(Visitor *v, const char *name, void **obj,
 {
     Error *err = NULL;
 
+    trace_visit_start_struct(v, name, obj, size);
     if (obj) {
         assert(size);
         assert(!(v->type & VISITOR_OUTPUT) || *obj);
@@ -53,6 +57,7 @@ void visit_start_struct(Visitor *v, const char *name, void **obj,
 
 void visit_check_struct(Visitor *v, Error **errp)
 {
+    trace_visit_check_struct(v);
     if (v->check_struct) {
         v->check_struct(v, errp);
     }
@@ -60,6 +65,7 @@ void visit_check_struct(Visitor *v, Error **errp)
 
 void visit_end_struct(Visitor *v, void **obj)
 {
+    trace_visit_end_struct(v, obj);
     v->end_struct(v, obj);
 }
 
@@ -69,6 +75,7 @@ void visit_start_list(Visitor *v, const char *name, GenericList **list,
     Error *err = NULL;
 
     assert(!list || size >= sizeof(GenericList));
+    trace_visit_start_list(v, name, list, size);
     v->start_list(v, name, list, size, &err);
     if (list && (v->type & VISITOR_INPUT)) {
         assert(!(err && *list));
@@ -79,11 +86,13 @@ void visit_start_list(Visitor *v, const char *name, GenericList **list,
 GenericList *visit_next_list(Visitor *v, GenericList *tail, size_t size)
 {
     assert(tail && size >= sizeof(GenericList));
+    trace_visit_next_list(v, tail, size);
     return v->next_list(v, tail, size);
 }
 
 void visit_end_list(Visitor *v, void **obj)
 {
+    trace_visit_end_list(v, obj);
     v->end_list(v, obj);
 }
 
@@ -95,6 +104,7 @@ void visit_start_alternate(Visitor *v, const char *name,
 
     assert(obj && size >= sizeof(GenericAlternate));
     assert(!(v->type & VISITOR_OUTPUT) || *obj);
+    trace_visit_start_alternate(v, name, obj, size, promote_int);
     if (v->start_alternate) {
         v->start_alternate(v, name, obj, size, promote_int, &err);
     }
@@ -106,6 +116,7 @@ void visit_start_alternate(Visitor *v, const char *name,
 
 void visit_end_alternate(Visitor *v, void **obj)
 {
+    trace_visit_end_alternate(v, obj);
     if (v->end_alternate) {
         v->end_alternate(v, obj);
     }
@@ -113,6 +124,7 @@ void visit_end_alternate(Visitor *v, void **obj)
 
 bool visit_optional(Visitor *v, const char *name, bool *present)
 {
+    trace_visit_optional(v, name, present);
     if (v->optional) {
         v->optional(v, name, present);
     }
@@ -127,6 +139,7 @@ bool visit_is_input(Visitor *v)
 void visit_type_int(Visitor *v, const char *name, int64_t *obj, Error **errp)
 {
     assert(obj);
+    trace_visit_type_int(v, name, obj);
     v->type_int64(v, name, obj, errp);
 }
 
@@ -150,7 +163,10 @@ static void visit_type_uintN(Visitor *v, uint64_t *obj, const char *name,
 void visit_type_uint8(Visitor *v, const char *name, uint8_t *obj,
                       Error **errp)
 {
-    uint64_t value = *obj;
+    uint64_t value;
+
+    trace_visit_type_uint8(v, name, obj);
+    value = *obj;
     visit_type_uintN(v, &value, name, UINT8_MAX, "uint8_t", errp);
     *obj = value;
 }
@@ -158,7 +174,10 @@ void visit_type_uint8(Visitor *v, const char *name, uint8_t *obj,
 void visit_type_uint16(Visitor *v, const char *name, uint16_t *obj,
                        Error **errp)
 {
-    uint64_t value = *obj;
+    uint64_t value;
+
+    trace_visit_type_uint16(v, name, obj);
+    value = *obj;
     visit_type_uintN(v, &value, name, UINT16_MAX, "uint16_t", errp);
     *obj = value;
 }
@@ -166,7 +185,10 @@ void visit_type_uint16(Visitor *v, const char *name, uint16_t *obj,
 void visit_type_uint32(Visitor *v, const char *name, uint32_t *obj,
                        Error **errp)
 {
-    uint64_t value = *obj;
+    uint64_t value;
+
+    trace_visit_type_uint32(v, name, obj);
+    value = *obj;
     visit_type_uintN(v, &value, name, UINT32_MAX, "uint32_t", errp);
     *obj = value;
 }
@@ -175,6 +197,7 @@ void visit_type_uint64(Visitor *v, const char *name, uint64_t *obj,
                        Error **errp)
 {
     assert(obj);
+    trace_visit_type_uint64(v, name, obj);
     v->type_uint64(v, name, obj, errp);
 }
 
@@ -198,7 +221,10 @@ static void visit_type_intN(Visitor *v, int64_t *obj, const char *name,
 
 void visit_type_int8(Visitor *v, const char *name, int8_t *obj, Error **errp)
 {
-    int64_t value = *obj;
+    int64_t value;
+
+    trace_visit_type_int8(v, name, obj);
+    value = *obj;
     visit_type_intN(v, &value, name, INT8_MIN, INT8_MAX, "int8_t", errp);
     *obj = value;
 }
@@ -206,7 +232,10 @@ void visit_type_int8(Visitor *v, const char *name, int8_t *obj, Error **errp)
 void visit_type_int16(Visitor *v, const char *name, int16_t *obj,
                       Error **errp)
 {
-    int64_t value = *obj;
+    int64_t value;
+
+    trace_visit_type_int16(v, name, obj);
+    value = *obj;
     visit_type_intN(v, &value, name, INT16_MIN, INT16_MAX, "int16_t", errp);
     *obj = value;
 }
@@ -214,7 +243,10 @@ void visit_type_int16(Visitor *v, const char *name, int16_t *obj,
 void visit_type_int32(Visitor *v, const char *name, int32_t *obj,
                       Error **errp)
 {
-    int64_t value = *obj;
+    int64_t value;
+
+    trace_visit_type_int32(v, name, obj);
+    value = *obj;
     visit_type_intN(v, &value, name, INT32_MIN, INT32_MAX, "int32_t", errp);
     *obj = value;
 }
@@ -223,6 +255,7 @@ void visit_type_int64(Visitor *v, const char *name, int64_t *obj,
                       Error **errp)
 {
     assert(obj);
+    trace_visit_type_int64(v, name, obj);
     v->type_int64(v, name, obj, errp);
 }
 
@@ -230,6 +263,7 @@ void visit_type_size(Visitor *v, const char *name, uint64_t *obj,
                      Error **errp)
 {
     assert(obj);
+    trace_visit_type_size(v, name, obj);
     if (v->type_size) {
         v->type_size(v, name, obj, errp);
     } else {
@@ -240,6 +274,7 @@ void visit_type_size(Visitor *v, const char *name, uint64_t *obj,
 void visit_type_bool(Visitor *v, const char *name, bool *obj, Error **errp)
 {
     assert(obj);
+    trace_visit_type_bool(v, name, obj);
     v->type_bool(v, name, obj, errp);
 }
 
@@ -252,6 +287,7 @@ void visit_type_str(Visitor *v, const char *name, char **obj, Error **errp)
      * can enable:
     assert(!(v->type & VISITOR_OUTPUT) || *obj);
      */
+    trace_visit_type_str(v, name, obj);
     v->type_str(v, name, obj, &err);
     if (v->type & VISITOR_INPUT) {
         assert(!err != !*obj);
@@ -263,6 +299,7 @@ void visit_type_number(Visitor *v, const char *name, double *obj,
                        Error **errp)
 {
     assert(obj);
+    trace_visit_type_number(v, name, obj);
     v->type_number(v, name, obj, errp);
 }
 
@@ -272,6 +309,7 @@ void visit_type_any(Visitor *v, const char *name, QObject **obj, Error **errp)
 
     assert(obj);
     assert(v->type != VISITOR_OUTPUT || *obj);
+    trace_visit_type_any(v, name, obj);
     v->type_any(v, name, obj, &err);
     if (v->type == VISITOR_INPUT) {
         assert(!err != !*obj);
@@ -281,6 +319,7 @@ void visit_type_any(Visitor *v, const char *name, QObject **obj, Error **errp)
 
 void visit_type_null(Visitor *v, const char *name, Error **errp)
 {
+    trace_visit_type_null(v, name);
     v->type_null(v, name, errp);
 }
 
diff --git a/qapi/trace-events b/qapi/trace-events
new file mode 100644
index 0000000000..2c5d3bc7d7
--- /dev/null
+++ b/qapi/trace-events
@@ -0,0 +1,33 @@
+# qapi-visit-core.c
+visit_free(void *v) "v=%p"
+visit_complete(void *v, void *opaque) "v=%p opaque=%p"
+
+visit_start_struct(void *v, const char *name, void *obj, size_t size) "v=%p name=%s obj=%p size=%zu"
+visit_check_struct(void *v) "v=%p"
+visit_end_struct(void *v, void *obj) "v=%p obj=%p"
+
+visit_start_list(void *v, const char *name, void *obj, size_t size) "v=%p name=%s obj=%p size=%zu"
+visit_next_list(void *v, void *tail, size_t size) "v=%p tail=%p size=%zu"
+visit_end_list(void *v, void *obj) "v=%p obj=%p"
+
+visit_start_alternate(void *v, const char *name, void *obj, size_t size, bool promote_int) "v=%p name=%s obj=%p size=%zu promote_int=%d"
+visit_end_alternate(void *v, void *obj) "v=%p obj=%p"
+
+visit_optional(void *v, const char *name, bool *present) "v=%p name=%s present=%p"
+
+visit_type_enum(void *v, const char *name, int *obj) "v=%p name=%s obj=%p"
+visit_type_int(void *v, const char *name, int64_t *obj) "v=%p name=%s obj=%p"
+visit_type_uint8(void *v, const char *name, uint8_t *obj) "v=%p name=%s obj=%p"
+visit_type_uint16(void *v, const char *name, uint16_t *obj) "v=%p name=%s obj=%p"
+visit_type_uint32(void *v, const char *name, uint32_t *obj) "v=%p name=%s obj=%p"
+visit_type_uint64(void *v, const char *name, uint64_t *obj) "v=%p name=%s obj=%p"
+visit_type_int8(void *v, const char *name, int8_t *obj) "v=%p name=%s obj=%p"
+visit_type_int16(void *v, const char *name, int16_t *obj) "v=%p name=%s obj=%p"
+visit_type_int32(void *v, const char *name, int32_t *obj) "v=%p name=%s obj=%p"
+visit_type_int64(void *v, const char *name, int64_t *obj) "v=%p name=%s obj=%p"
+visit_type_size(void *v, const char *name, uint64_t *obj) "v=%p name=%s obj=%p"
+visit_type_bool(void *v, const char *name, bool *obj) "v=%p name=%s obj=%p"
+visit_type_str(void *v, const char *name, char **obj) "v=%p name=%s obj=%p"
+visit_type_number(void *v, const char *name, double *obj) "v=%p name=%s obj=%p"
+visit_type_any(void *v, const char *name, void *obj) "v=%p name=%s obj=%p"
+visit_type_null(void *v, const char *name) "v=%p name=%s"