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bh=uwsAGapOhQHVbm/iIny+CACibwCIp7kJv++sEiXwlN0=; b=WOnbn/s9qOKbpd0DJ8/V8pEFSptyyovUbNLNNigLLkgN/o7fnsgjBdiOAjcrqxVmNiC+vK TMwbuAXdHCz5upsw90/ZRKYUmT1/5ROnU2UvTiVONxpqetrnlKy9hQa6Eenu9rruJpU2oS aLOhO3P4gqwQ/S3irJZE7Bmicb5Yqj4= X-MC-Unique: efXt_QPaPvKfUWSLFGRLyQ-1 From: Kevin Wolf To: qemu-devel@nongnu.org Subject: [PATCH 2/6] qapi: Remember alias definitions in qobject-input-visitor Date: Thu, 12 Nov 2020 18:28:46 +0100 Message-Id: <20201112172850.401925-3-kwolf@redhat.com> In-Reply-To: <20201112172850.401925-1-kwolf@redhat.com> References: <20201112172850.401925-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" This makes qobject-input-visitor remember the currently valid aliases in each StackObject. It doesn't actually allow using the aliases yet. Signed-off-by: Kevin Wolf --- qapi/qobject-input-visitor.c | 115 +++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) diff --git a/qapi/qobject-input-visitor.c b/qapi/qobject-input-visitor.c index 23843b242e..a00ac32682 100644 --- a/qapi/qobject-input-visitor.c +++ b/qapi/qobject-input-visitor.c @@ -29,6 +29,29 @@ #include "qemu/cutils.h" #include "qemu/option.h" =20 +typedef struct InputVisitorAlias { + /* Alias name. NULL for any (wildcard alias). */ + const char *alias; + + /* + * NULL terminated array representing a path. + * Must contain at least one non-NULL element if alias is not NULL. + */ + const char **src; + + /* StackObject in which the alias should be looked for */ + struct StackObject *alias_so; + + /* + * The alias remains valid as long as the containing StackObject has + * StackObject.alias_scope_nesting >=3D InputVisitorAlias.scope_nesting + * or until the whole StackObject is removed. + */ + int scope_nesting; + + QSLIST_ENTRY(InputVisitorAlias) next; +} InputVisitorAlias; + typedef struct StackObject { const char *name; /* Name of @obj in its parent, if any */ QObject *obj; /* QDict or QList being visited */ @@ -38,6 +61,9 @@ typedef struct StackObject { const QListEntry *entry; /* If @obj is QList: unvisited tail */ unsigned index; /* If @obj is QList: list index of @entry = */ =20 + QSLIST_HEAD(, InputVisitorAlias) aliases; + int alias_scope_nesting; /* Increase on scope start, decrease on en= d */ + QSLIST_ENTRY(StackObject) node; /* parent */ } StackObject; =20 @@ -203,6 +229,38 @@ static const char *qobject_input_get_keyval(QObjectInp= utVisitor *qiv, return qstring_get_str(qstr); } =20 +/* + * Propagates aliases from the parent StackObject @src to its direct + * child StackObject @dst, which is representing the child struct @name. + * + * Every alias whose source path begins with @name and which still + * applies in @dst (i.e. it is either a wildcard alias or has at least + * one more source path element) is propagated to @dst with the first + * element (i.e. @name) removed from the source path. + */ +static void propagate_aliases(StackObject *dst, StackObject *src, + const char *name) +{ + InputVisitorAlias *a; + + QSLIST_FOREACH(a, &src->aliases, next) { + if (!a->src[0] || strcmp(a->src[0], name)) { + continue; + } + if (a->src[1] || !a->alias) { + InputVisitorAlias *alias =3D g_new(InputVisitorAlias, 1); + + *alias =3D (InputVisitorAlias) { + .alias =3D a->alias, + .alias_so =3D a->alias_so, + .src =3D &a->src[1], + }; + + QSLIST_INSERT_HEAD(&dst->aliases, alias, next); + } + } +} + static const QListEntry *qobject_input_push(QObjectInputVisitor *qiv, const char *name, QObject *obj, void *qapi) @@ -226,6 +284,9 @@ static const QListEntry *qobject_input_push(QObjectInpu= tVisitor *qiv, g_hash_table_insert(h, (void *)qdict_entry_key(entry), NULL); } tos->h =3D h; + if (!QSLIST_EMPTY(&qiv->stack)) { + propagate_aliases(tos, QSLIST_FIRST(&qiv->stack), name); + } } else { assert(qlist); tos->entry =3D qlist_first(qlist); @@ -257,10 +318,17 @@ static bool qobject_input_check_struct(Visitor *v, Er= ror **errp) =20 static void qobject_input_stack_object_free(StackObject *tos) { + InputVisitorAlias *a; + if (tos->h) { g_hash_table_unref(tos->h); } =20 + while ((a =3D QSLIST_FIRST(&tos->aliases))) { + QSLIST_REMOVE_HEAD(&tos->aliases, next); + g_free(a); + } + g_free(tos); } =20 @@ -274,6 +342,50 @@ static void qobject_input_pop(Visitor *v, void **obj) qobject_input_stack_object_free(tos); } =20 +static void qobject_input_start_alias_scope(Visitor *v) +{ + QObjectInputVisitor *qiv =3D to_qiv(v); + StackObject *tos =3D QSLIST_FIRST(&qiv->stack); + + tos->alias_scope_nesting++; +} + +static void qobject_input_end_alias_scope(Visitor *v) +{ + QObjectInputVisitor *qiv =3D to_qiv(v); + StackObject *tos =3D QSLIST_FIRST(&qiv->stack); + InputVisitorAlias *a, *next; + + assert(tos->alias_scope_nesting > 0); + tos->alias_scope_nesting--; + + QSLIST_FOREACH_SAFE(a, &tos->aliases, next, next) { + if (a->scope_nesting > tos->alias_scope_nesting) { + QSLIST_REMOVE(&tos->aliases, a, InputVisitorAlias, next); + g_free(a); + } + } +} + +static void qobject_input_define_alias(Visitor *v, const char *alias_name, + const char **source) +{ + QObjectInputVisitor *qiv =3D to_qiv(v); + StackObject *tos =3D QSLIST_FIRST(&qiv->stack); + InputVisitorAlias *alias =3D g_new(InputVisitorAlias, 1); + + /* The source path can only be empty for wildcard aliases */ + assert(source[0] || !alias_name); + + *alias =3D (InputVisitorAlias) { + .alias =3D alias_name, + .alias_so =3D tos, + .src =3D source, + }; + + QSLIST_INSERT_HEAD(&tos->aliases, alias, next); +} + static bool qobject_input_start_struct(Visitor *v, const char *name, void = **obj, size_t size, Error **errp) { @@ -696,6 +808,9 @@ static QObjectInputVisitor *qobject_input_visitor_base_= new(QObject *obj) v->visitor.end_list =3D qobject_input_end_list; v->visitor.start_alternate =3D qobject_input_start_alternate; v->visitor.optional =3D qobject_input_optional; + v->visitor.define_alias =3D qobject_input_define_alias; + v->visitor.start_alias_scope =3D qobject_input_start_alias_scope; + v->visitor.end_alias_scope =3D qobject_input_end_alias_scope; v->visitor.free =3D qobject_input_free; =20 v->root =3D qobject_ref(obj); --=20 2.28.0