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qapi-visit: Convert to new qapi union layout

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We have two issues with our qapi union layout:
1) Even though the QMP wire format spells the tag 'type', the
C code spells it 'kind', requiring some hacks in the generator.
2) The C struct uses an anonymous union, which places all tag
values in the same namespace as all non-variant members. This
leads to spurious collisions if a tag value matches a non-variant
member's name.

Make the conversion to the new layout for qapi-visit.py.

Generated code changes look like:

|@@ -4912,16 +4912,16 @@ void visit_type_MemoryDeviceInfo(Visitor
|     if (!*obj) {
|         goto out_obj;
|     }
|-    visit_type_MemoryDeviceInfoKind(v, &(*obj)->kind, "type", &err);
|+    visit_type_MemoryDeviceInfoKind(v, &(*obj)->type, "type", &err);
|     if (err) {
|         goto out_obj;
|     }
|-    if (!visit_start_union(v, !!(*obj)->data, &err) || err) {
|+    if (!visit_start_union(v, !!(*obj)->u.data, &err) || err) {
|         goto out_obj;
|     }
|-    switch ((*obj)->kind) {
|+    switch ((*obj)->type) {
|     case MEMORY_DEVICE_INFO_KIND_DIMM:
|-        visit_type_PCDIMMDeviceInfo(v, &(*obj)->dimm, "data", &err);
|+        visit_type_PCDIMMDeviceInfo(v, &(*obj)->u.dimm, "data", &err);
|         break;
|     default:
|         abort();
|@@ -4930,7 +4930,7 @@ out_obj:
|     error_propagate(errp, err);
|     err = NULL;
|     if (*obj) {
|-        visit_end_union(v, !!(*obj)->data, &err);
|+        visit_end_union(v, !!(*obj)->u.data, &err);
|     }
|     error_propagate(errp, err);
|     err = NULL;

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1445898903-12082-14-git-send-email-eblake@redhat.com>
[Commit message tweaked slightly]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Eric Blake 2015-10-26 16:34:52 -06:00 committed by Markus Armbruster
parent f51d8fab44
commit 150d0564a4
1 changed files with 9 additions and 15 deletions
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24
scripts/qapi-visit.py
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@ -189,18 +189,18 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
if (err) {
goto out;
}
visit_get_next_type(v, (int*) &(*obj)->kind, %(c_name)s_qtypes, name, &err);
visit_get_next_type(v, (int*) &(*obj)->type, %(c_name)s_qtypes, name, &err);
if (err) {
goto out_obj;
}
switch ((*obj)->kind) {
switch ((*obj)->type) {
''',
c_name=c_name(name))
for var in variants.variants:
ret += mcgen('''
case %(case)s:
visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, name, &err);
visit_type_%(c_type)s(v, &(*obj)->u.%(c_name)s, name, &err);
break;
''',
case=c_enum_const(variants.tag_member.type.name,
@ -261,22 +261,16 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, "%(name)s", &err);
''',
c_type=variants.tag_member.type.c_name(),
# TODO ugly special case for simple union
# Use same tag name in C as on the wire to get rid of
# it, then: c_name=c_name(variants.tag_member.name)
c_name='kind',
c_name=c_name(variants.tag_member.name),
name=variants.tag_member.name)
ret += gen_err_check(label='out_obj')
ret += mcgen('''
if (!visit_start_union(v, !!(*obj)->data, &err) || err) {
if (!visit_start_union(v, !!(*obj)->u.data, &err) || err) {
goto out_obj;
}
switch ((*obj)->%(c_name)s) {
''',
# TODO ugly special case for simple union
# Use same tag name in C as on the wire to get rid of
# it, then: c_name=c_name(variants.tag_member.name)
c_name=c_name(variants.tag_name or 'kind'))
c_name=c_name(variants.tag_member.name))
for var in variants.variants:
# TODO ugly special case for simple union
@ -288,13 +282,13 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
var.name))
if simple_union_type:
ret += mcgen('''
visit_type_%(c_type)s(v, &(*obj)->%(c_name)s, "data", &err);
visit_type_%(c_type)s(v, &(*obj)->u.%(c_name)s, "data", &err);
''',
c_type=simple_union_type.c_name(),
c_name=c_name(var.name))
else:
ret += mcgen('''
visit_type_implicit_%(c_type)s(v, &(*obj)->%(c_name)s, &err);
visit_type_implicit_%(c_type)s(v, &(*obj)->u.%(c_name)s, &err);
''',
c_type=var.type.c_name(),
c_name=c_name(var.name))
@ -310,7 +304,7 @@ out_obj:
error_propagate(errp, err);
err = NULL;
if (*obj) {
visit_end_union(v, !!(*obj)->data, &err);
visit_end_union(v, !!(*obj)->u.data, &err);
}
error_propagate(errp, err);
err = NULL;