On Mon, 13 Jun 2011 21:31:12 -0500 Michael Roth <mdr...@linux.vnet.ibm.com> wrote:
> Type of Visitor class that can be passed into a qapi-generated C > type's visitor function to free() any heap-allocated data types. > > Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com> > --- > Makefile.objs | 2 +- > qapi/qapi-dealloc-visitor.c | 127 > +++++++++++++++++++++++++++++++++++++++++++ > qapi/qapi-dealloc-visitor.h | 26 +++++++++ > 3 files changed, 154 insertions(+), 1 deletions(-) > create mode 100644 qapi/qapi-dealloc-visitor.c > create mode 100644 qapi/qapi-dealloc-visitor.h > > diff --git a/Makefile.objs b/Makefile.objs > index af302ea..3860252 100644 > --- a/Makefile.objs > +++ b/Makefile.objs > @@ -367,7 +367,7 @@ libcacard-y = cac.o event.o vcard.o vreader.o > vcard_emul_nss.o vcard_emul_type.o > ###################################################################### > # qapi > > -qapi-nested-y = qapi-visit-core.o qmp-input-visitor.o qmp-output-visitor.o > +qapi-nested-y = qapi-visit-core.o qmp-input-visitor.o qmp-output-visitor.o > qapi-dealloc-visitor.o > qapi-obj-y = $(addprefix qapi/, $(qapi-nested-y)) > > vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS) > diff --git a/qapi/qapi-dealloc-visitor.c b/qapi/qapi-dealloc-visitor.c > new file mode 100644 > index 0000000..1fabfe6 > --- /dev/null > +++ b/qapi/qapi-dealloc-visitor.c > @@ -0,0 +1,127 @@ > +#include "qapi-dealloc-visitor.h" > +#include "qemu-queue.h" > +#include "qemu-common.h" > +#include "qemu-objects.h" > + > +typedef struct StackEntry > +{ > + void *value; > + QTAILQ_ENTRY(StackEntry) node; > +} StackEntry; > + > +struct QapiDeallocVisitor > +{ > + Visitor visitor; > + QTAILQ_HEAD(, StackEntry) stack; > +}; > + > +static QapiDeallocVisitor *to_qov(Visitor *v) > +{ > + return container_of(v, QapiDeallocVisitor, visitor); > +} > + > +static void qapi_dealloc_push(QapiDeallocVisitor *qov, void *value) > +{ > + StackEntry *e = qemu_mallocz(sizeof(*e)); > + > + e->value = value; > + QTAILQ_INSERT_HEAD(&qov->stack, e, node); > +} > + > +static void *qapi_dealloc_pop(QapiDeallocVisitor *qov) > +{ > + StackEntry *e = QTAILQ_FIRST(&qov->stack); > + QObject *value; > + QTAILQ_REMOVE(&qov->stack, e, node); > + value = e->value; > + qemu_free(e); > + return value; > +} > + > +static void qapi_dealloc_start_struct(Visitor *v, void **obj, const char > *kind, const char *name, size_t unused, Error **errp) > +{ > + QapiDeallocVisitor *qov = to_qov(v); > + qapi_dealloc_push(qov, obj); > +} > + > +static void qapi_dealloc_end_struct(Visitor *v, Error **errp) > +{ > + QapiDeallocVisitor *qov = to_qov(v); > + void **obj = qapi_dealloc_pop(qov); > + if (obj && *obj) { > + qemu_free(*obj); > + } > +} > + > +static void qapi_dealloc_start_list(Visitor *v, const char *name, Error > **errp) > +{ > +} > + > +static GenericList *qapi_dealloc_next_list(Visitor *v, GenericList **list, > Error **errp) > +{ > + GenericList *retval = *list; > + if (retval->value) { > + qemu_free(retval->value); > + } > + *list = retval->next; > + return retval; > +} > + > +static void qapi_dealloc_end_list(Visitor *v, Error **errp) > +{ > +} > + > +static void qapi_dealloc_type_str(Visitor *v, char **obj, const char *name, > Error **errp) > +{ > + if (obj && *obj) { > + qemu_free(*obj); > + } qemu_free() knows how to deal with nulls. This applies to the three qemu_free() calls in above. > +} > + > +static void qapi_dealloc_type_int(Visitor *v, int64_t *obj, const char > *name, Error **errp) > +{ > +} > + > +static void qapi_dealloc_type_bool(Visitor *v, bool *obj, const char *name, > Error **errp) > +{ > +} > + > +static void qapi_dealloc_type_number(Visitor *v, double *obj, const char > *name, Error **errp) > +{ > +} > + > +static void qapi_dealloc_type_enum(Visitor *v, int *obj, const char *kind, > const char *name, Error **errp) > +{ > +} > + > +Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v) > +{ > + return &v->visitor; > +} > + > +void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *v) > +{ > + qemu_free(v); > +} > + > +QapiDeallocVisitor *qapi_dealloc_visitor_new(void) > +{ > + QapiDeallocVisitor *v; > + > + v = qemu_mallocz(sizeof(*v)); > + > + v->visitor.start_struct = qapi_dealloc_start_struct; > + v->visitor.end_struct = qapi_dealloc_end_struct; > + v->visitor.start_list = qapi_dealloc_start_list; > + v->visitor.next_list = qapi_dealloc_next_list; > + v->visitor.end_list = qapi_dealloc_end_list; > + v->visitor.type_enum = qapi_dealloc_type_enum; > + v->visitor.type_int = qapi_dealloc_type_int; > + v->visitor.type_bool = qapi_dealloc_type_bool; > + v->visitor.type_str = qapi_dealloc_type_str; > + v->visitor.type_number = qapi_dealloc_type_number; > + > + QTAILQ_INIT(&v->stack); > + > + return v; > +} > diff --git a/qapi/qapi-dealloc-visitor.h b/qapi/qapi-dealloc-visitor.h > new file mode 100644 > index 0000000..5842bc7 > --- /dev/null > +++ b/qapi/qapi-dealloc-visitor.h > @@ -0,0 +1,26 @@ > +/* > + * Dealloc Visitor > + * > + * Copyright IBM, Corp. 2011 > + * > + * Authors: > + * Michael Roth <mdr...@linux.vnet.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_DEALLOC_VISITOR_H > +#define QAPI_DEALLOC_VISITOR_H > + > +#include "qapi-visit-core.h" > + > +typedef struct QapiDeallocVisitor QapiDeallocVisitor; > + > +QapiDeallocVisitor *qapi_dealloc_visitor_new(void); > +void qapi_dealloc_visitor_cleanup(QapiDeallocVisitor *d); > + > +Visitor *qapi_dealloc_get_visitor(QapiDeallocVisitor *v); > + > +#endif