[Libguestfs] [PATCH v2 5/9] qapi: Generalize struct member policy checking

The generated visitor functions call visit_deprecated_accept() and visit_deprecated() when visiting a struct member with special feature flag 'deprecated'. This makes the feature flag visible to the actual visitors. I want to make feature flag 'unstable' visible there as well, so I can add policy for it. To let me make it visible, replace these functions by visit_policy_reject() and visit_policy_skip(), which take the member's special features as an argument. Note that the new functions have the opposite sense, i.e. the return value flips. Signed-off-by: Markus Armbruster <armbru(a)redhat.com&gt; --- include/qapi/visitor-impl.h | 6 ++++-- include/qapi/visitor.h | 17 +++++++++++++---- qapi/qapi-forward-visitor.c | 16 +++++++++------- qapi/qapi-visit-core.c | 22 ++++++++++++---------- qapi/qobject-input-visitor.c | 15 ++++++++++----- qapi/qobject-output-visitor.c | 9 ++++++--- qapi/trace-events | 4 ++-- scripts/qapi/visit.py | 14 +++++++------- 8 files changed, 63 insertions(+), 40 deletions(-) diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h index 72b6537bef..2badec5ba4 100644 --- a/include/qapi/visitor-impl.h +++ b/include/qapi/visitor-impl.h @@ -114,10 +114,12 @@ struct Visitor void (*optional)(Visitor *v, const char *name, bool *present); /* Optional */ - bool (*deprecated_accept)(Visitor *v, const char *name, Error **errp); + bool (*policy_reject)(Visitor *v, const char *name, + unsigned special_features, Error **errp); /* Optional */ - bool (*deprecated)(Visitor *v, const char *name); + bool (*policy_skip)(Visitor *v, const char *name, + unsigned special_features); /* Must be set */ VisitorType type; diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h index dcb96018a9..d53a84c9ba 100644 --- a/include/qapi/visitor.h +++ b/include/qapi/visitor.h @@ -461,22 +461,31 @@ void visit_end_alternate(Visitor *v, void **obj); bool visit_optional(Visitor *v, const char *name, bool *present); /* - * Should we reject deprecated member @name? + * Should we reject member @name due to policy? + * + * @special_features is the member's special features encoded as a + * bitset of QapiSpecialFeature. * * @name must not be NULL. This function is only useful between * visit_start_struct() and visit_end_struct(), since only objects * have deprecated members. */ -bool visit_deprecated_accept(Visitor *v, const char *name, Error **errp); +bool visit_policy_reject(Visitor *v, const char *name, + unsigned special_features, Error **errp); /* - * Should we visit deprecated member @name? + * + * Should we skip member @name due to policy? + * + * @special_features is the member's special features encoded as a + * bitset of QapiSpecialFeature. * * @name must not be NULL. This function is only useful between * visit_start_struct() and visit_end_struct(), since only objects * have deprecated members. */ -bool visit_deprecated(Visitor *v, const char *name); +bool visit_policy_skip(Visitor *v, const char *name, + unsigned special_features); /* * Set policy for handling deprecated management interfaces. diff --git a/qapi/qapi-forward-visitor.c b/qapi/qapi-forward-visitor.c index a4b111e22a..25d098aa8a 100644 --- a/qapi/qapi-forward-visitor.c +++ b/qapi/qapi-forward-visitor.c @@ -246,25 +246,27 @@ static void forward_field_optional(Visitor *v, const char *name, bool *present) visit_optional(ffv->target, name, present); } -static bool forward_field_deprecated_accept(Visitor *v, const char *name, - Error **errp) +static bool forward_field_policy_reject(Visitor *v, const char *name, + unsigned special_features, + Error **errp) { ForwardFieldVisitor *ffv = to_ffv(v); if (!forward_field_translate_name(ffv, &name, errp)) { return false; } - return visit_deprecated_accept(ffv->target, name, errp); + return visit_policy_reject(ffv->target, name, special_features, errp); } -static bool forward_field_deprecated(Visitor *v, const char *name) +static bool forward_field_policy_skip(Visitor *v, const char *name, + unsigned special_features) { ForwardFieldVisitor *ffv = to_ffv(v); if (!forward_field_translate_name(ffv, &name, NULL)) { return false; } - return visit_deprecated(ffv->target, name); + return visit_policy_skip(ffv->target, name, special_features); } static void forward_field_complete(Visitor *v, void *opaque) @@ -313,8 +315,8 @@ Visitor *visitor_forward_field(Visitor *target, const char *from, const char *to v->visitor.type_any = forward_field_type_any; v->visitor.type_null = forward_field_type_null; v->visitor.optional = forward_field_optional; - v->visitor.deprecated_accept = forward_field_deprecated_accept; - v->visitor.deprecated = forward_field_deprecated; + v->visitor.policy_reject = forward_field_policy_reject; + v->visitor.policy_skip = forward_field_policy_skip; v->visitor.complete = forward_field_complete; v->visitor.free = forward_field_free; diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c index 617ef3fa46..f95503cbec 100644 --- a/qapi/qapi-visit-core.c +++ b/qapi/qapi-visit-core.c @@ -139,22 +139,24 @@ bool visit_optional(Visitor *v, const char *name, bool *present) return *present; } -bool visit_deprecated_accept(Visitor *v, const char *name, Error **errp) +bool visit_policy_reject(Visitor *v, const char *name, + unsigned special_features, Error **errp) { - trace_visit_deprecated_accept(v, name); - if (v->deprecated_accept) { - return v->deprecated_accept(v, name, errp); + trace_visit_policy_reject(v, name); + if (v->policy_reject) { + return v->policy_reject(v, name, special_features, errp); } - return true; + return false; } -bool visit_deprecated(Visitor *v, const char *name) +bool visit_policy_skip(Visitor *v, const char *name, + unsigned special_features) { - trace_visit_deprecated(v, name); - if (v->deprecated) { - return v->deprecated(v, name); + trace_visit_policy_skip(v, name); + if (v->policy_skip) { + return v->policy_skip(v, name, special_features); } - return true; + return false; } void visit_set_policy(Visitor *v, CompatPolicy *policy) diff --git a/qapi/qobject-input-visitor.c b/qapi/qobject-input-visitor.c index 71b24a4429..c120dbdd92 100644 --- a/qapi/qobject-input-visitor.c +++ b/qapi/qobject-input-visitor.c @@ -662,16 +662,21 @@ static void qobject_input_optional(Visitor *v, const char *name, bool *present) *present = true; } -static bool qobject_input_deprecated_accept(Visitor *v, const char *name, - Error **errp) +static bool qobject_input_policy_reject(Visitor *v, const char *name, + unsigned special_features, + Error **errp) { + if (!(special_features & 1u << QAPI_DEPRECATED)) { + return false; + } + switch (v->compat_policy.deprecated_input) { case COMPAT_POLICY_INPUT_ACCEPT: - return true; + return false; case COMPAT_POLICY_INPUT_REJECT: error_setg(errp, "Deprecated parameter '%s' disabled by policy", name); - return false; + return true; case COMPAT_POLICY_INPUT_CRASH: default: abort(); @@ -712,7 +717,7 @@ 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.deprecated_accept = qobject_input_deprecated_accept; + v->visitor.policy_reject = qobject_input_policy_reject; v->visitor.free = qobject_input_free; v->root = qobject_ref(obj); diff --git a/qapi/qobject-output-visitor.c b/qapi/qobject-output-visitor.c index 9b7f510036..b155bf4149 100644 --- a/qapi/qobject-output-visitor.c +++ b/qapi/qobject-output-visitor.c @@ -13,6 +13,7 @@ */ #include "qemu/osdep.h" +#include "qapi/compat-policy.h" #include "qapi/qobject-output-visitor.h" #include "qapi/visitor-impl.h" #include "qemu/queue.h" @@ -208,9 +209,11 @@ static bool qobject_output_type_null(Visitor *v, const char *name, return true; } -static bool qobject_output_deprecated(Visitor *v, const char *name) +static bool qobject_output_policy_skip(Visitor *v, const char *name, + unsigned special_features) { - return v->compat_policy.deprecated_output != COMPAT_POLICY_OUTPUT_HIDE; + return !(special_features & 1u << QAPI_DEPRECATED) + || v->compat_policy.deprecated_output == COMPAT_POLICY_OUTPUT_HIDE; } /* Finish building, and return the root object. @@ -262,7 +265,7 @@ Visitor *qobject_output_visitor_new(QObject **result) v->visitor.type_number = qobject_output_type_number; v->visitor.type_any = qobject_output_type_any; v->visitor.type_null = qobject_output_type_null; - v->visitor.deprecated = qobject_output_deprecated; + v->visitor.policy_skip = qobject_output_policy_skip; v->visitor.complete = qobject_output_complete; v->visitor.free = qobject_output_free; diff --git a/qapi/trace-events b/qapi/trace-events index cccafc07e5..ab108c4f0e 100644 --- a/qapi/trace-events +++ b/qapi/trace-events @@ -17,8 +17,8 @@ visit_start_alternate(void *v, const char *name, void *obj, size_t size) "v=%p n visit_end_alternate(void *v, void *obj) "v=%p obj=%p" visit_optional(void *v, const char *name, bool *present) "v=%p name=%s present=%p" -visit_deprecated_accept(void *v, const char *name) "v=%p name=%s" -visit_deprecated(void *v, const char *name) "v=%p name=%s" +visit_policy_reject(void *v, const char *name) "v=%p name=%s" +visit_policy_skip(void *v, const char *name) "v=%p name=%s" visit_type_enum(void *v, const char *name, int *obj) "v=%p name=%s obj=%p" visit_type_int(void *v, const char *name, int64_t *obj) "v=%p name=%s obj=%p" diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py index 9d9196a143..e13bbe4292 100644 --- a/scripts/qapi/visit.py +++ b/scripts/qapi/visit.py @@ -21,7 +21,7 @@ indent, mcgen, ) -from .gen import QAPISchemaModularCVisitor, ifcontext +from .gen import QAPISchemaModularCVisitor, gen_special_features, ifcontext from .schema import ( QAPISchema, QAPISchemaEnumMember, @@ -76,7 +76,6 @@ def gen_visit_object_members(name: str, c_type=base.c_name()) for memb in members: - deprecated = 'deprecated' in [f.name for f in memb.features] ret += memb.ifcond.gen_if() if memb.optional: ret += mcgen(''' @@ -84,14 +83,15 @@ def gen_visit_object_members(name: str, ''', name=memb.name, c_name=c_name(memb.name)) indent.increase() - if deprecated: + special_features = gen_special_features(memb.features) + if special_features != '0': ret += mcgen(''' - if (!visit_deprecated_accept(v, "%(name)s", errp)) { + if (visit_policy_reject(v, "%(name)s", %(special_features)s, errp)) { return false; } - if (visit_deprecated(v, "%(name)s")) { + if (!visit_policy_skip(v, "%(name)s", %(special_features)s)) { ''', - name=memb.name) + name=memb.name, special_features=special_features) indent.increase() ret += mcgen(''' if (!visit_type_%(c_type)s(v, "%(name)s", &obj->%(c_name)s, errp)) { @@ -100,7 +100,7 @@ def gen_visit_object_members(name: str, ''', c_type=memb.type.c_name(), name=memb.name, c_name=c_name(memb.name)) - if deprecated: + if special_features != '0': indent.decrease() ret += mcgen(''' } -- 2.31.1