From 48825ca419fd9c8140d4fecb24e982d68ebca74f Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Wed, 13 Jul 2016 21:50:19 -0600 Subject: qapi: Plumb in 'boxed' to qapi generator lower levels The next patch will add support for passing a qapi union type as the 'data' of a command. But to do that, the user function for implementing the command, as called by the generated marshal command, must take the corresponding C struct as a single boxed pointer, rather than a breakdown into one parameter per member. Even without a union, being able to use a C struct rather than a list of parameters can make it much easier to handle coding with QAPI. This patch adds the internal plumbing of a 'boxed' flag associated with each command and event. In several cases, this means adding indentation, with one new dead branch and the remaining branch being the original code more deeply nested; this was done so that the new implementation in the next patch is easier to review without also being mixed with indentation changes. For this patch, no behavior or generated output changes, other than the testsuite outputting the value of the new flag (always False for now). Signed-off-by: Eric Blake Message-Id: <1468468228-27827-9-git-send-email-eblake@redhat.com> Reviewed-by: Markus Armbruster [Identifier box renamed to boxed in two places] Signed-off-by: Markus Armbruster --- scripts/qapi-commands.py | 20 +++++++++++--------- scripts/qapi-event.py | 18 +++++++++--------- scripts/qapi-introspect.py | 4 ++-- scripts/qapi.py | 43 +++++++++++++++++++++++++++---------------- 4 files changed, 49 insertions(+), 36 deletions(-) (limited to 'scripts') diff --git a/scripts/qapi-commands.py b/scripts/qapi-commands.py index 333a46f..0090fb4 100644 --- a/scripts/qapi-commands.py +++ b/scripts/qapi-commands.py @@ -16,20 +16,22 @@ from qapi import * import re -def gen_command_decl(name, arg_type, ret_type): +def gen_command_decl(name, arg_type, boxed, ret_type): return mcgen(''' %(c_type)s qmp_%(c_name)s(%(params)s); ''', c_type=(ret_type and ret_type.c_type()) or 'void', c_name=c_name(name), - params=gen_params(arg_type, 'Error **errp')) + params=gen_params(arg_type, boxed, 'Error **errp')) -def gen_call(name, arg_type, ret_type): +def gen_call(name, arg_type, boxed, ret_type): ret = '' argstr = '' - if arg_type: + if boxed: + assert False # not implemented + elif arg_type: assert not arg_type.variants for memb in arg_type.members: if memb.optional: @@ -94,7 +96,7 @@ def gen_marshal_decl(name): proto=gen_marshal_proto(name)) -def gen_marshal(name, arg_type, ret_type): +def gen_marshal(name, arg_type, boxed, ret_type): ret = mcgen(''' %(proto)s @@ -136,7 +138,7 @@ def gen_marshal(name, arg_type, ret_type): (void)args; ''') - ret += gen_call(name, arg_type, ret_type) + ret += gen_call(name, arg_type, boxed, ret_type) # 'goto out' produced above for arg_type, and by gen_call() for ret_type if (arg_type and not arg_type.is_empty()) or ret_type: @@ -212,16 +214,16 @@ class QAPISchemaGenCommandVisitor(QAPISchemaVisitor): self._visited_ret_types = None def visit_command(self, name, info, arg_type, ret_type, - gen, success_response): + gen, success_response, boxed): if not gen: return - self.decl += gen_command_decl(name, arg_type, ret_type) + self.decl += gen_command_decl(name, arg_type, boxed, ret_type) if ret_type and ret_type not in self._visited_ret_types: self._visited_ret_types.add(ret_type) self.defn += gen_marshal_output(ret_type) if middle_mode: self.decl += gen_marshal_decl(name) - self.defn += gen_marshal(name, arg_type, ret_type) + self.defn += gen_marshal(name, arg_type, boxed, ret_type) if not middle_mode: self._regy += gen_register_command(name, success_response) diff --git a/scripts/qapi-event.py b/scripts/qapi-event.py index b9c6b6e..53410c2 100644 --- a/scripts/qapi-event.py +++ b/scripts/qapi-event.py @@ -14,18 +14,18 @@ from qapi import * -def gen_event_send_proto(name, arg_type): +def gen_event_send_proto(name, arg_type, boxed): return 'void qapi_event_send_%(c_name)s(%(param)s)' % { 'c_name': c_name(name.lower()), - 'param': gen_params(arg_type, 'Error **errp')} + 'param': gen_params(arg_type, boxed, 'Error **errp')} -def gen_event_send_decl(name, arg_type): +def gen_event_send_decl(name, arg_type, boxed): return mcgen(''' %(proto)s; ''', - proto=gen_event_send_proto(name, arg_type)) + proto=gen_event_send_proto(name, arg_type, boxed)) # Declare and initialize an object 'qapi' using parameters from gen_params() @@ -57,7 +57,7 @@ def gen_param_var(typ): return ret -def gen_event_send(name, arg_type): +def gen_event_send(name, arg_type, boxed): # FIXME: Our declaration of local variables (and of 'errp' in the # parameter list) can collide with exploded members of the event's # data type passed in as parameters. If this collision ever hits in @@ -72,7 +72,7 @@ def gen_event_send(name, arg_type): Error *err = NULL; QMPEventFuncEmit emit; ''', - proto=gen_event_send_proto(name, arg_type)) + proto=gen_event_send_proto(name, arg_type, boxed)) if arg_type and not arg_type.is_empty(): ret += mcgen(''' @@ -160,9 +160,9 @@ class QAPISchemaGenEventVisitor(QAPISchemaVisitor): self.defn += gen_enum_lookup(event_enum_name, self._event_names) self._event_names = None - def visit_event(self, name, info, arg_type): - self.decl += gen_event_send_decl(name, arg_type) - self.defn += gen_event_send(name, arg_type) + def visit_event(self, name, info, arg_type, boxed): + self.decl += gen_event_send_decl(name, arg_type, boxed) + self.defn += gen_event_send(name, arg_type, boxed) self._event_names.append(name) diff --git a/scripts/qapi-introspect.py b/scripts/qapi-introspect.py index e0f926b..541644e 100644 --- a/scripts/qapi-introspect.py +++ b/scripts/qapi-introspect.py @@ -154,14 +154,14 @@ const char %(c_name)s[] = %(c_string)s; for m in variants.variants]}) def visit_command(self, name, info, arg_type, ret_type, - gen, success_response): + gen, success_response, boxed): arg_type = arg_type or self._schema.the_empty_object_type ret_type = ret_type or self._schema.the_empty_object_type self._gen_json(name, 'command', {'arg-type': self._use_type(arg_type), 'ret-type': self._use_type(ret_type)}) - def visit_event(self, name, info, arg_type): + def visit_event(self, name, info, arg_type, boxed): arg_type = arg_type or self._schema.the_empty_object_type self._gen_json(name, 'event', {'arg-type': self._use_type(arg_type)}) diff --git a/scripts/qapi.py b/scripts/qapi.py index 9c48f6d..0c6159c 100644 --- a/scripts/qapi.py +++ b/scripts/qapi.py @@ -826,10 +826,10 @@ class QAPISchemaVisitor(object): pass def visit_command(self, name, info, arg_type, ret_type, - gen, success_response): + gen, success_response, boxed): pass - def visit_event(self, name, info, arg_type): + def visit_event(self, name, info, arg_type, boxed): pass @@ -1165,7 +1165,8 @@ class QAPISchemaAlternateType(QAPISchemaType): class QAPISchemaCommand(QAPISchemaEntity): - def __init__(self, name, info, arg_type, ret_type, gen, success_response): + def __init__(self, name, info, arg_type, ret_type, gen, success_response, + boxed): QAPISchemaEntity.__init__(self, name, info) assert not arg_type or isinstance(arg_type, str) assert not ret_type or isinstance(ret_type, str) @@ -1175,12 +1176,14 @@ class QAPISchemaCommand(QAPISchemaEntity): self.ret_type = None self.gen = gen self.success_response = success_response + self.boxed = boxed def check(self, schema): if self._arg_type_name: self.arg_type = schema.lookup_type(self._arg_type_name) assert isinstance(self.arg_type, QAPISchemaObjectType) assert not self.arg_type.variants # not implemented + assert not self.boxed # not implemented if self._ret_type_name: self.ret_type = schema.lookup_type(self._ret_type_name) assert isinstance(self.ret_type, QAPISchemaType) @@ -1188,24 +1191,26 @@ class QAPISchemaCommand(QAPISchemaEntity): def visit(self, visitor): visitor.visit_command(self.name, self.info, self.arg_type, self.ret_type, - self.gen, self.success_response) + self.gen, self.success_response, self.boxed) class QAPISchemaEvent(QAPISchemaEntity): - def __init__(self, name, info, arg_type): + def __init__(self, name, info, arg_type, boxed): QAPISchemaEntity.__init__(self, name, info) assert not arg_type or isinstance(arg_type, str) self._arg_type_name = arg_type self.arg_type = None + self.boxed = boxed def check(self, schema): if self._arg_type_name: self.arg_type = schema.lookup_type(self._arg_type_name) assert isinstance(self.arg_type, QAPISchemaObjectType) assert not self.arg_type.variants # not implemented + assert not self.boxed # not implemented def visit(self, visitor): - visitor.visit_event(self.name, self.info, self.arg_type) + visitor.visit_event(self.name, self.info, self.arg_type, self.boxed) class QAPISchema(object): @@ -1381,6 +1386,7 @@ class QAPISchema(object): rets = expr.get('returns') gen = expr.get('gen', True) success_response = expr.get('success-response', True) + boxed = expr.get('boxed', False) if isinstance(data, OrderedDict): data = self._make_implicit_object_type( name, info, 'arg', self._make_members(data, info)) @@ -1388,15 +1394,16 @@ class QAPISchema(object): assert len(rets) == 1 rets = self._make_array_type(rets[0], info) self._def_entity(QAPISchemaCommand(name, info, data, rets, gen, - success_response)) + success_response, boxed)) def _def_event(self, expr, info): name = expr['event'] data = expr.get('data') + boxed = expr.get('boxed', False) if isinstance(data, OrderedDict): data = self._make_implicit_object_type( name, info, 'arg', self._make_members(data, info)) - self._def_entity(QAPISchemaEvent(name, info, data)) + self._def_entity(QAPISchemaEvent(name, info, data, boxed)) def _def_exprs(self): for expr_elem in self.exprs: @@ -1639,18 +1646,22 @@ extern const char *const %(c_name)s_lookup[]; return ret -def gen_params(arg_type, extra): +def gen_params(arg_type, boxed, extra): if not arg_type: return extra - assert not arg_type.variants ret = '' sep = '' - for memb in arg_type.members: - ret += sep - sep = ', ' - if memb.optional: - ret += 'bool has_%s, ' % c_name(memb.name) - ret += '%s %s' % (memb.type.c_param_type(), c_name(memb.name)) + if boxed: + assert False # not implemented + else: + assert not arg_type.variants + for memb in arg_type.members: + ret += sep + sep = ', ' + if memb.optional: + ret += 'bool has_%s, ' % c_name(memb.name) + ret += '%s %s' % (memb.type.c_param_type(), + c_name(memb.name)) if extra: ret += sep + extra return ret -- cgit v1.1