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qapi: Plumb in 'boxed' to qapi generator lower levels

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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 <eblake@redhat.com>
Message-Id: <1468468228-27827-9-git-send-email-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Identifier box renamed to boxed in two places]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2016-07-13 21:50:19 -06:00 • committed by Markus Armbruster
parent 4d0b268fdb
commit 48825ca419
9 changed files with 70 additions and 49 deletions
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18
scripts/qapi-event.py
View file

@ -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)