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[PATCH 2/6] qapi: Remember alias definitions in qobject-input-visitor
From: |
Kevin Wolf |
Subject: |
[PATCH 2/6] qapi: Remember alias definitions in qobject-input-visitor |
Date: |
Thu, 12 Nov 2020 18:28:46 +0100 |
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 <kwolf@redhat.com>
---
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"
+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 >= 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 */
+ QSLIST_HEAD(, InputVisitorAlias) aliases;
+ int alias_scope_nesting; /* Increase on scope start, decrease on end */
+
QSLIST_ENTRY(StackObject) node; /* parent */
} StackObject;
@@ -203,6 +229,38 @@ static const char
*qobject_input_get_keyval(QObjectInputVisitor *qiv,
return qstring_get_str(qstr);
}
+/*
+ * 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 = g_new(InputVisitorAlias, 1);
+
+ *alias = (InputVisitorAlias) {
+ .alias = a->alias,
+ .alias_so = a->alias_so,
+ .src = &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(QObjectInputVisitor *qiv,
g_hash_table_insert(h, (void *)qdict_entry_key(entry), NULL);
}
tos->h = h;
+ if (!QSLIST_EMPTY(&qiv->stack)) {
+ propagate_aliases(tos, QSLIST_FIRST(&qiv->stack), name);
+ }
} else {
assert(qlist);
tos->entry = qlist_first(qlist);
@@ -257,10 +318,17 @@ static bool qobject_input_check_struct(Visitor *v, Error
**errp)
static void qobject_input_stack_object_free(StackObject *tos)
{
+ InputVisitorAlias *a;
+
if (tos->h) {
g_hash_table_unref(tos->h);
}
+ while ((a = QSLIST_FIRST(&tos->aliases))) {
+ QSLIST_REMOVE_HEAD(&tos->aliases, next);
+ g_free(a);
+ }
+
g_free(tos);
}
@@ -274,6 +342,50 @@ static void qobject_input_pop(Visitor *v, void **obj)
qobject_input_stack_object_free(tos);
}
+static void qobject_input_start_alias_scope(Visitor *v)
+{
+ QObjectInputVisitor *qiv = to_qiv(v);
+ StackObject *tos = QSLIST_FIRST(&qiv->stack);
+
+ tos->alias_scope_nesting++;
+}
+
+static void qobject_input_end_alias_scope(Visitor *v)
+{
+ QObjectInputVisitor *qiv = to_qiv(v);
+ StackObject *tos = 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 = to_qiv(v);
+ StackObject *tos = QSLIST_FIRST(&qiv->stack);
+ InputVisitorAlias *alias = g_new(InputVisitorAlias, 1);
+
+ /* The source path can only be empty for wildcard aliases */
+ assert(source[0] || !alias_name);
+
+ *alias = (InputVisitorAlias) {
+ .alias = alias_name,
+ .alias_so = tos,
+ .src = 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 = qobject_input_end_list;
v->visitor.start_alternate = qobject_input_start_alternate;
v->visitor.optional = qobject_input_optional;
+ v->visitor.define_alias = qobject_input_define_alias;
+ v->visitor.start_alias_scope = qobject_input_start_alias_scope;
+ v->visitor.end_alias_scope = qobject_input_end_alias_scope;
v->visitor.free = qobject_input_free;
v->root = qobject_ref(obj);
--
2.28.0
[PATCH 6/6] tests/qapi-schema: Test cases for aliases, Kevin Wolf, 2020/11/12