Patchwork [v3,04/21] qapi: add QAPI visitor core

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Submitter Michael Roth
Date June 14, 2011, 2:31 a.m.
Message ID <1308018686-8235-5-git-send-email-mdroth@linux.vnet.ibm.com>
Download mbox | patch
Permalink /patch/100233/
State New
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Comments

Michael Roth - June 14, 2011, 2:31 a.m.
Base definitions/includes for Visiter interface used by generated
visiter/marshalling code.

Includes a GenericList type. Our lists require an embedded element.
Since these types are generated, if you want to use them in a different
type of data structure, there's no easy way to add another embedded
element. The solution is to have non-embedded lists and that what this is.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 Makefile.objs          |    6 +++
 qapi/qapi-types-core.h |   21 ++++++++++
 qapi/qapi-visit-core.c |  101 ++++++++++++++++++++++++++++++++++++++++++++++++
 qapi/qapi-visit-core.h |   68 ++++++++++++++++++++++++++++++++
 4 files changed, 196 insertions(+), 0 deletions(-)
 create mode 100644 qapi/qapi-types-core.h
 create mode 100644 qapi/qapi-visit-core.c
 create mode 100644 qapi/qapi-visit-core.h
Luiz Capitulino - June 15, 2011, 2:33 p.m.
On Mon, 13 Jun 2011 21:31:09 -0500
Michael Roth <mdroth@linux.vnet.ibm.com> wrote:

> Base definitions/includes for Visiter interface used by generated
> visiter/marshalling code.
> 
> Includes a GenericList type. Our lists require an embedded element.
> Since these types are generated, if you want to use them in a different
> type of data structure, there's no easy way to add another embedded
> element. The solution is to have non-embedded lists and that what this is.
> 
> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
> ---
>  Makefile.objs          |    6 +++
>  qapi/qapi-types-core.h |   21 ++++++++++
>  qapi/qapi-visit-core.c |  101 ++++++++++++++++++++++++++++++++++++++++++++++++
>  qapi/qapi-visit-core.h |   68 ++++++++++++++++++++++++++++++++
>  4 files changed, 196 insertions(+), 0 deletions(-)
>  create mode 100644 qapi/qapi-types-core.h
>  create mode 100644 qapi/qapi-visit-core.c
>  create mode 100644 qapi/qapi-visit-core.h
> 
> diff --git a/Makefile.objs b/Makefile.objs
> index a7807e8..68d7b5a 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -364,6 +364,12 @@ endif
>  
>  libcacard-y = cac.o event.o vcard.o vreader.o vcard_emul_nss.o vcard_emul_type.o card_7816.o
>  
> +######################################################################
> +# qapi
> +
> +qapi-nested-y = qapi-visit-core.o
> +qapi-obj-y = $(addprefix qapi/, $(qapi-nested-y))

To build this I have to add qapi-obj-y to common-obj-y and add the
qapi directory to the DIR variable in configure (so that it builds
in a different directory).

I saw that you send the configure change in a different patch, but it
has to be done here.

> +
>  vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)
>  
>  vl.o: QEMU_CFLAGS+=$(SDL_CFLAGS)
> diff --git a/qapi/qapi-types-core.h b/qapi/qapi-types-core.h
> new file mode 100644
> index 0000000..de733ab
> --- /dev/null
> +++ b/qapi/qapi-types-core.h
> @@ -0,0 +1,21 @@
> +/*
> + * Core Definitions for QAPI-generated Types
> + *
> + * Copyright IBM, Corp. 2011
> + *
> + * Authors:
> + *  Anthony Liguori   <aliguori@us.ibm.com>
> + *
> + * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
> + * See the COPYING.LIB file in the top-level directory.
> + *
> + */
> +
> +#ifndef QAPI_TYPES_CORE_H
> +#define QAPI_TYPES_CORE_H
> +
> +#include <stdbool.h>
> +#include <stdint.h>
> +#include "error.h"
> +
> +#endif
> diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
> new file mode 100644
> index 0000000..948818e
> --- /dev/null
> +++ b/qapi/qapi-visit-core.c
> @@ -0,0 +1,101 @@
> +#include "qapi/qapi-visit-core.h"

No license info.

> +
> +void visit_start_handle(Visitor *v, void **obj, const char *kind, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp) && v->start_handle) {
> +        v->start_handle(v, obj, kind, name, errp);
> +    }
> +}
> +
> +void visit_end_handle(Visitor *v, Error **errp)
> +{
> +    if (!error_is_set(errp) && v->end_handle) {
> +        v->end_handle(v, errp);
> +    }
> +}
> +
> +void visit_start_struct(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->start_struct(v, obj, kind, name, size, errp);
> +    }
> +}
> +
> +void visit_end_struct(Visitor *v, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->end_struct(v, errp);
> +    }
> +}
> +
> +void visit_start_list(Visitor *v, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->start_list(v, name, errp);
> +    }
> +}
> +
> +GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        return v->next_list(v, list, errp);
> +    }
> +
> +    return 0;
> +}
> +
> +void visit_end_list(Visitor *v, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->end_list(v, errp);
> +    }
> +}
> +
> +void visit_start_optional(Visitor *v, bool *present, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp) && v->start_optional) {
> +        v->start_optional(v, present, name, errp);
> +    }
> +}
> +
> +void visit_end_optional(Visitor *v, Error **errp)
> +{
> +    if (!error_is_set(errp) && v->end_optional) {
> +        v->end_optional(v, errp);
> +    }
> +}
> +
> +void visit_type_enum(Visitor *v, int *obj, const char *kind, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->type_enum(v, obj, kind, name, errp);
> +    }
> +}
> +
> +void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->type_int(v, obj, name, errp);
> +    }
> +}
> +
> +void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->type_bool(v, obj, name, errp);
> +    }
> +}
> +
> +void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->type_str(v, obj, name, errp);
> +    }
> +}
> +
> +void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
> +{
> +    if (!error_is_set(errp)) {
> +        v->type_number(v, obj, name, errp);
> +    }
> +}
> diff --git a/qapi/qapi-visit-core.h b/qapi/qapi-visit-core.h
> new file mode 100644
> index 0000000..8350a6d
> --- /dev/null
> +++ b/qapi/qapi-visit-core.h
> @@ -0,0 +1,68 @@
> +/*
> + * Core Definitions for QAPI Visitor Classes
> + *
> + * Copyright IBM, Corp. 2011
> + *
> + * Authors:
> + *  Anthony Liguori   <aliguori@us.ibm.com>
> + *
> + * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
> + * See the COPYING.LIB file in the top-level directory.
> + *
> + */
> +#ifndef QAPI_VISITOR_CORE_H
> +#define QAPI_VISITOR_CORE_H
> +
> +#include "qapi/qapi-types-core.h"
> +#include "error.h"
> +#include <stdlib.h>
> +
> +typedef struct GenericList
> +{
> +    void *value;
> +    struct GenericList *next;
> +} GenericList;
> +
> +typedef struct Visitor Visitor;
> +
> +struct Visitor
> +{
> +    /* Must be set */
> +    void (*start_struct)(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp);
> +    void (*end_struct)(Visitor *v, Error **errp);
> +
> +    void (*start_list)(Visitor *v, const char *name, Error **errp);
> +    GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
> +    void (*end_list)(Visitor *v, Error **errp);
> +
> +    void (*type_enum)(Visitor *v, int *obj, const char *kind, const char *name, Error **errp);
> +
> +    void (*type_int)(Visitor *v, int64_t *obj, const char *name, Error **errp);
> +    void (*type_bool)(Visitor *v, bool *obj, const char *name, Error **errp);
> +    void (*type_str)(Visitor *v, char **obj, const char *name, Error **errp);
> +    void (*type_number)(Visitor *v, double *obj, const char *name, Error **errp);
> +
> +    /* May be NULL */
> +    void (*start_optional)(Visitor *v, bool *present, const char *name, Error **errp);
> +    void (*end_optional)(Visitor *v, Error **errp);
> +
> +    void (*start_handle)(Visitor *v, void **obj, const char *kind, const char *name, Error **errp);
> +    void (*end_handle)(Visitor *v, Error **errp);
> +};
> +
> +void visit_start_handle(Visitor *v, void **obj, const char *kind, const char *name, Error **errp);
> +void visit_end_handle(Visitor *v, Error **errp);
> +void visit_start_struct(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp);
> +void visit_end_struct(Visitor *v, Error **errp);
> +void visit_start_list(Visitor *v, const char *name, Error **errp);
> +GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp);
> +void visit_end_list(Visitor *v, Error **errp);
> +void visit_start_optional(Visitor *v, bool *present, const char *name, Error **errp);
> +void visit_end_optional(Visitor *v, Error **errp);
> +void visit_type_enum(Visitor *v, int *obj, const char *kind, const char *name, Error **errp);
> +void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp);
> +void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp);
> +void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp);
> +void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp);
> +
> +#endif
Michael Roth - June 15, 2011, 2:54 p.m.
On 06/15/2011 09:33 AM, Luiz Capitulino wrote:
> On Mon, 13 Jun 2011 21:31:09 -0500
> Michael Roth<mdroth@linux.vnet.ibm.com>  wrote:
>
>> Base definitions/includes for Visiter interface used by generated
>> visiter/marshalling code.
>>
>> Includes a GenericList type. Our lists require an embedded element.
>> Since these types are generated, if you want to use them in a different
>> type of data structure, there's no easy way to add another embedded
>> element. The solution is to have non-embedded lists and that what this is.
>>
>> Signed-off-by: Michael Roth<mdroth@linux.vnet.ibm.com>
>> ---
>>   Makefile.objs          |    6 +++
>>   qapi/qapi-types-core.h |   21 ++++++++++
>>   qapi/qapi-visit-core.c |  101 ++++++++++++++++++++++++++++++++++++++++++++++++
>>   qapi/qapi-visit-core.h |   68 ++++++++++++++++++++++++++++++++
>>   4 files changed, 196 insertions(+), 0 deletions(-)
>>   create mode 100644 qapi/qapi-types-core.h
>>   create mode 100644 qapi/qapi-visit-core.c
>>   create mode 100644 qapi/qapi-visit-core.h
>>
>> diff --git a/Makefile.objs b/Makefile.objs
>> index a7807e8..68d7b5a 100644
>> --- a/Makefile.objs
>> +++ b/Makefile.objs
>> @@ -364,6 +364,12 @@ endif
>>
>>   libcacard-y = cac.o event.o vcard.o vreader.o vcard_emul_nss.o vcard_emul_type.o card_7816.o
>>
>> +######################################################################
>> +# qapi
>> +
>> +qapi-nested-y = qapi-visit-core.o
>> +qapi-obj-y = $(addprefix qapi/, $(qapi-nested-y))
>
> To build this I have to add qapi-obj-y to common-obj-y and add the
> qapi directory to the DIR variable in configure (so that it builds
> in a different directory).

Yah, nobody actually uses these right now except the unit tests/guest 
agent so for test builds you have to manually add qapi-obj-y to another 
target like qemu-img. I'll move the configure change to this patch in 
the next run.

>
> I saw that you send the configure change in a different patch, but it
> has to be done here.
>
>> +
>>   vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)
>>
>>   vl.o: QEMU_CFLAGS+=$(SDL_CFLAGS)
>> diff --git a/qapi/qapi-types-core.h b/qapi/qapi-types-core.h
>> new file mode 100644
>> index 0000000..de733ab
>> --- /dev/null
>> +++ b/qapi/qapi-types-core.h
>> @@ -0,0 +1,21 @@
>> +/*
>> + * Core Definitions for QAPI-generated Types
>> + *
>> + * Copyright IBM, Corp. 2011
>> + *
>> + * Authors:
>> + *  Anthony Liguori<aliguori@us.ibm.com>
>> + *
>> + * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
>> + * See the COPYING.LIB file in the top-level directory.
>> + *
>> + */
>> +
>> +#ifndef QAPI_TYPES_CORE_H
>> +#define QAPI_TYPES_CORE_H
>> +
>> +#include<stdbool.h>
>> +#include<stdint.h>
>> +#include "error.h"
>> +
>> +#endif
>> diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
>> new file mode 100644
>> index 0000000..948818e
>> --- /dev/null
>> +++ b/qapi/qapi-visit-core.c
>> @@ -0,0 +1,101 @@
>> +#include "qapi/qapi-visit-core.h"
>
> No license info.
>

Doh! Something about the term "copyright header" frequently causes me to 
disregard non-.h files. These will all get fixed in the next run.

>> +
>> +void visit_start_handle(Visitor *v, void **obj, const char *kind, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)&&  v->start_handle) {
>> +        v->start_handle(v, obj, kind, name, errp);
>> +    }
>> +}
>> +
>> +void visit_end_handle(Visitor *v, Error **errp)
>> +{
>> +    if (!error_is_set(errp)&&  v->end_handle) {
>> +        v->end_handle(v, errp);
>> +    }
>> +}
>> +
>> +void visit_start_struct(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->start_struct(v, obj, kind, name, size, errp);
>> +    }
>> +}
>> +
>> +void visit_end_struct(Visitor *v, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->end_struct(v, errp);
>> +    }
>> +}
>> +
>> +void visit_start_list(Visitor *v, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->start_list(v, name, errp);
>> +    }
>> +}
>> +
>> +GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        return v->next_list(v, list, errp);
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>> +void visit_end_list(Visitor *v, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->end_list(v, errp);
>> +    }
>> +}
>> +
>> +void visit_start_optional(Visitor *v, bool *present, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)&&  v->start_optional) {
>> +        v->start_optional(v, present, name, errp);
>> +    }
>> +}
>> +
>> +void visit_end_optional(Visitor *v, Error **errp)
>> +{
>> +    if (!error_is_set(errp)&&  v->end_optional) {
>> +        v->end_optional(v, errp);
>> +    }
>> +}
>> +
>> +void visit_type_enum(Visitor *v, int *obj, const char *kind, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->type_enum(v, obj, kind, name, errp);
>> +    }
>> +}
>> +
>> +void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->type_int(v, obj, name, errp);
>> +    }
>> +}
>> +
>> +void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->type_bool(v, obj, name, errp);
>> +    }
>> +}
>> +
>> +void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->type_str(v, obj, name, errp);
>> +    }
>> +}
>> +
>> +void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
>> +{
>> +    if (!error_is_set(errp)) {
>> +        v->type_number(v, obj, name, errp);
>> +    }
>> +}
>> diff --git a/qapi/qapi-visit-core.h b/qapi/qapi-visit-core.h
>> new file mode 100644
>> index 0000000..8350a6d
>> --- /dev/null
>> +++ b/qapi/qapi-visit-core.h
>> @@ -0,0 +1,68 @@
>> +/*
>> + * Core Definitions for QAPI Visitor Classes
>> + *
>> + * Copyright IBM, Corp. 2011
>> + *
>> + * Authors:
>> + *  Anthony Liguori<aliguori@us.ibm.com>
>> + *
>> + * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
>> + * See the COPYING.LIB file in the top-level directory.
>> + *
>> + */
>> +#ifndef QAPI_VISITOR_CORE_H
>> +#define QAPI_VISITOR_CORE_H
>> +
>> +#include "qapi/qapi-types-core.h"
>> +#include "error.h"
>> +#include<stdlib.h>
>> +
>> +typedef struct GenericList
>> +{
>> +    void *value;
>> +    struct GenericList *next;
>> +} GenericList;
>> +
>> +typedef struct Visitor Visitor;
>> +
>> +struct Visitor
>> +{
>> +    /* Must be set */
>> +    void (*start_struct)(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp);
>> +    void (*end_struct)(Visitor *v, Error **errp);
>> +
>> +    void (*start_list)(Visitor *v, const char *name, Error **errp);
>> +    GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
>> +    void (*end_list)(Visitor *v, Error **errp);
>> +
>> +    void (*type_enum)(Visitor *v, int *obj, const char *kind, const char *name, Error **errp);
>> +
>> +    void (*type_int)(Visitor *v, int64_t *obj, const char *name, Error **errp);
>> +    void (*type_bool)(Visitor *v, bool *obj, const char *name, Error **errp);
>> +    void (*type_str)(Visitor *v, char **obj, const char *name, Error **errp);
>> +    void (*type_number)(Visitor *v, double *obj, const char *name, Error **errp);
>> +
>> +    /* May be NULL */
>> +    void (*start_optional)(Visitor *v, bool *present, const char *name, Error **errp);
>> +    void (*end_optional)(Visitor *v, Error **errp);
>> +
>> +    void (*start_handle)(Visitor *v, void **obj, const char *kind, const char *name, Error **errp);
>> +    void (*end_handle)(Visitor *v, Error **errp);
>> +};
>> +
>> +void visit_start_handle(Visitor *v, void **obj, const char *kind, const char *name, Error **errp);
>> +void visit_end_handle(Visitor *v, Error **errp);
>> +void visit_start_struct(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp);
>> +void visit_end_struct(Visitor *v, Error **errp);
>> +void visit_start_list(Visitor *v, const char *name, Error **errp);
>> +GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp);
>> +void visit_end_list(Visitor *v, Error **errp);
>> +void visit_start_optional(Visitor *v, bool *present, const char *name, Error **errp);
>> +void visit_end_optional(Visitor *v, Error **errp);
>> +void visit_type_enum(Visitor *v, int *obj, const char *kind, const char *name, Error **errp);
>> +void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp);
>> +void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp);
>> +void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp);
>> +void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp);
>> +
>> +#endif
>

Patch

diff --git a/Makefile.objs b/Makefile.objs
index a7807e8..68d7b5a 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -364,6 +364,12 @@  endif
 
 libcacard-y = cac.o event.o vcard.o vreader.o vcard_emul_nss.o vcard_emul_type.o card_7816.o
 
+######################################################################
+# qapi
+
+qapi-nested-y = qapi-visit-core.o
+qapi-obj-y = $(addprefix qapi/, $(qapi-nested-y))
+
 vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)
 
 vl.o: QEMU_CFLAGS+=$(SDL_CFLAGS)
diff --git a/qapi/qapi-types-core.h b/qapi/qapi-types-core.h
new file mode 100644
index 0000000..de733ab
--- /dev/null
+++ b/qapi/qapi-types-core.h
@@ -0,0 +1,21 @@ 
+/*
+ * Core Definitions for QAPI-generated Types
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QAPI_TYPES_CORE_H
+#define QAPI_TYPES_CORE_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "error.h"
+
+#endif
diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
new file mode 100644
index 0000000..948818e
--- /dev/null
+++ b/qapi/qapi-visit-core.c
@@ -0,0 +1,101 @@ 
+#include "qapi/qapi-visit-core.h"
+
+void visit_start_handle(Visitor *v, void **obj, const char *kind, const char *name, Error **errp)
+{
+    if (!error_is_set(errp) && v->start_handle) {
+        v->start_handle(v, obj, kind, name, errp);
+    }
+}
+
+void visit_end_handle(Visitor *v, Error **errp)
+{
+    if (!error_is_set(errp) && v->end_handle) {
+        v->end_handle(v, errp);
+    }
+}
+
+void visit_start_struct(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->start_struct(v, obj, kind, name, size, errp);
+    }
+}
+
+void visit_end_struct(Visitor *v, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->end_struct(v, errp);
+    }
+}
+
+void visit_start_list(Visitor *v, const char *name, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->start_list(v, name, errp);
+    }
+}
+
+GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        return v->next_list(v, list, errp);
+    }
+
+    return 0;
+}
+
+void visit_end_list(Visitor *v, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->end_list(v, errp);
+    }
+}
+
+void visit_start_optional(Visitor *v, bool *present, const char *name, Error **errp)
+{
+    if (!error_is_set(errp) && v->start_optional) {
+        v->start_optional(v, present, name, errp);
+    }
+}
+
+void visit_end_optional(Visitor *v, Error **errp)
+{
+    if (!error_is_set(errp) && v->end_optional) {
+        v->end_optional(v, errp);
+    }
+}
+
+void visit_type_enum(Visitor *v, int *obj, const char *kind, const char *name, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->type_enum(v, obj, kind, name, errp);
+    }
+}
+
+void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->type_int(v, obj, name, errp);
+    }
+}
+
+void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->type_bool(v, obj, name, errp);
+    }
+}
+
+void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->type_str(v, obj, name, errp);
+    }
+}
+
+void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        v->type_number(v, obj, name, errp);
+    }
+}
diff --git a/qapi/qapi-visit-core.h b/qapi/qapi-visit-core.h
new file mode 100644
index 0000000..8350a6d
--- /dev/null
+++ b/qapi/qapi-visit-core.h
@@ -0,0 +1,68 @@ 
+/*
+ * Core Definitions for QAPI Visitor Classes
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+#ifndef QAPI_VISITOR_CORE_H
+#define QAPI_VISITOR_CORE_H
+
+#include "qapi/qapi-types-core.h"
+#include "error.h"
+#include <stdlib.h>
+
+typedef struct GenericList
+{
+    void *value;
+    struct GenericList *next;
+} GenericList;
+
+typedef struct Visitor Visitor;
+
+struct Visitor
+{
+    /* Must be set */
+    void (*start_struct)(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp);
+    void (*end_struct)(Visitor *v, Error **errp);
+
+    void (*start_list)(Visitor *v, const char *name, Error **errp);
+    GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
+    void (*end_list)(Visitor *v, Error **errp);
+
+    void (*type_enum)(Visitor *v, int *obj, const char *kind, const char *name, Error **errp);
+
+    void (*type_int)(Visitor *v, int64_t *obj, const char *name, Error **errp);
+    void (*type_bool)(Visitor *v, bool *obj, const char *name, Error **errp);
+    void (*type_str)(Visitor *v, char **obj, const char *name, Error **errp);
+    void (*type_number)(Visitor *v, double *obj, const char *name, Error **errp);
+
+    /* May be NULL */
+    void (*start_optional)(Visitor *v, bool *present, const char *name, Error **errp);
+    void (*end_optional)(Visitor *v, Error **errp);
+
+    void (*start_handle)(Visitor *v, void **obj, const char *kind, const char *name, Error **errp);
+    void (*end_handle)(Visitor *v, Error **errp);
+};
+
+void visit_start_handle(Visitor *v, void **obj, const char *kind, const char *name, Error **errp);
+void visit_end_handle(Visitor *v, Error **errp);
+void visit_start_struct(Visitor *v, void **obj, const char *kind, const char *name, size_t size, Error **errp);
+void visit_end_struct(Visitor *v, Error **errp);
+void visit_start_list(Visitor *v, const char *name, Error **errp);
+GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp);
+void visit_end_list(Visitor *v, Error **errp);
+void visit_start_optional(Visitor *v, bool *present, const char *name, Error **errp);
+void visit_end_optional(Visitor *v, Error **errp);
+void visit_type_enum(Visitor *v, int *obj, const char *kind, const char *name, Error **errp);
+void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp);
+void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp);
+void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp);
+void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp);
+
+#endif