From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40795) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKmB7-0006eH-7Y for qemu-devel@nongnu.org; Wed, 06 Jul 2016 08:43:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bKmB4-00016u-Jn for qemu-devel@nongnu.org; Wed, 06 Jul 2016 08:43:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59975) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bKmB4-00016n-BZ for qemu-devel@nongnu.org; Wed, 06 Jul 2016 08:43:42 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E6B3D7F088 for ; Wed, 6 Jul 2016 12:43:41 +0000 (UTC) From: Paolo Bonzini Date: Wed, 6 Jul 2016 14:43:37 +0200 Message-Id: <1467809017-25023-2-git-send-email-pbonzini@redhat.com> In-Reply-To: <1467809017-25023-1-git-send-email-pbonzini@redhat.com> References: <1467809017-25023-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH] qapi: change QmpInputVisitor to QSLIST List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: armbru@redhat.com, eblake@redhat.com This saves a lot of memory compared to a statically-sized array. Signed-off-by: Paolo Bonzini --- qapi/qmp-input-visitor.c | 53 ++++++++++++++++++++++++------------------------ 1 file changed, 26 insertions(+), 27 deletions(-) diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c index aea90a1..28629b1 100644 --- a/qapi/qmp-input-visitor.c +++ b/qapi/qmp-input-visitor.c @@ -29,6 +29,8 @@ typedef struct StackObject GHashTable *h; /* If obj is dict: unvisited keys */ const QListEntry *entry; /* If obj is list: unvisited tail */ + + QSLIST_ENTRY(StackObject) node; } StackObject; struct QmpInputVisitor @@ -40,8 +42,7 @@ struct QmpInputVisitor /* Stack of objects being visited (all entries will be either * QDict or QList). */ - StackObject stack[QIV_STACK_SIZE]; - int nb_stack; + QSLIST_HEAD(, StackObject) stack; /* True to reject parse in visit_end_struct() if unvisited keys remain. */ bool strict; @@ -60,13 +61,13 @@ static QObject *qmp_input_get_object(QmpInputVisitor *qiv, QObject *qobj; QObject *ret; - if (!qiv->nb_stack) { + if (QSLIST_EMPTY(&qiv->stack)) { /* Starting at root, name is ignored. */ return qiv->root; } /* We are in a container; find the next element. */ - tos = &qiv->stack[qiv->nb_stack - 1]; + tos = QSLIST_FIRST(&qiv->stack); qobj = tos->obj; assert(qobj); @@ -99,17 +100,10 @@ static const QListEntry *qmp_input_push(QmpInputVisitor *qiv, QObject *obj, Error **errp) { GHashTable *h; - StackObject *tos = &qiv->stack[qiv->nb_stack]; + StackObject *tos = g_new0(StackObject, 1); assert(obj); - if (qiv->nb_stack >= QIV_STACK_SIZE) { - error_setg(errp, "An internal buffer overran"); - return NULL; - } - tos->obj = obj; - assert(!tos->h); - assert(!tos->entry); if (qiv->strict && qobject_type(obj) == QTYPE_QDICT) { h = g_hash_table_new(g_str_hash, g_str_equal); @@ -119,7 +113,7 @@ static const QListEntry *qmp_input_push(QmpInputVisitor *qiv, QObject *obj, tos->entry = qlist_first(qobject_to_qlist(obj)); } - qiv->nb_stack++; + QSLIST_INSERT_HEAD(&qiv->stack, tos, node); return tos->entry; } @@ -127,9 +121,7 @@ static const QListEntry *qmp_input_push(QmpInputVisitor *qiv, QObject *obj, static void qmp_input_check_struct(Visitor *v, Error **errp) { QmpInputVisitor *qiv = to_qiv(v); - StackObject *tos = &qiv->stack[qiv->nb_stack - 1]; - - assert(qiv->nb_stack > 0); + StackObject *tos = QSLIST_FIRST(&qiv->stack); if (qiv->strict) { GHashTable *const top_ht = tos->h; @@ -145,22 +137,25 @@ static void qmp_input_check_struct(Visitor *v, Error **errp) } } -static void qmp_input_pop(Visitor *v) +static void qmp_input_stack_pop(QmpInputVisitor *qiv) { - QmpInputVisitor *qiv = to_qiv(v); - StackObject *tos = &qiv->stack[qiv->nb_stack - 1]; - - assert(qiv->nb_stack > 0); + StackObject *tos = QSLIST_FIRST(&qiv->stack); if (qiv->strict) { - GHashTable * const top_ht = qiv->stack[qiv->nb_stack - 1].h; - if (top_ht) { - g_hash_table_unref(top_ht); + if (tos->h) { + g_hash_table_unref(tos->h); } - tos->h = NULL; } - qiv->nb_stack--; + QSLIST_REMOVE_HEAD(&qiv->stack, node); + g_free(tos); +} + +static void qmp_input_pop(Visitor *v) +{ + QmpInputVisitor *qiv = to_qiv(v); + + qmp_input_stack_pop(qiv); } static void qmp_input_start_struct(Visitor *v, const char *name, void **obj, @@ -221,7 +216,7 @@ static GenericList *qmp_input_next_list(Visitor *v, GenericList *tail, size_t size) { QmpInputVisitor *qiv = to_qiv(v); - StackObject *so = &qiv->stack[qiv->nb_stack - 1]; + StackObject *so = QSLIST_FIRST(&qiv->stack); if (!so->entry) { return NULL; @@ -377,6 +372,10 @@ Visitor *qmp_input_get_visitor(QmpInputVisitor *v) void qmp_input_visitor_cleanup(QmpInputVisitor *v) { + while (!QSLIST_EMPTY(&v->stack)) { + qmp_input_stack_pop(v); + } + qobject_decref(v->root); g_free(v); } -- 2.7.4