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authorEric Blake <eblake@redhat.com>2016-02-17 23:48:16 -0700
committerMarkus Armbruster <armbru@redhat.com>2016-02-19 11:08:56 +0100
commit02a57ae32b08e8981b59979b80e682c9a153e94d (patch)
tree418d1597e1ea5ff8e3f119fe453e990746299fe3 /tests/qapi-schema
parentf96493b1ab14e307495119064c32765f436b349c (diff)
qapi: Forbid empty unions and useless alternates
Empty unions serve no purpose, and while we compile with gcc which permits them, strict C99 forbids them. We happen to inject a dummy 'void *data' member into the C unions that represent QAPI unions and alternates, but we want to get rid of that member (it pollutes the namespace for no good reason), which would leave us with an empty union if the user didn't provide any branches. While empty structs make sense in QAPI, empty unions don't add any expressiveness to the QMP language. So prohibit them at parse time. Update the documentation and testsuite to match. Note that the documentation already mentioned that alternates should have "two or more JSON data types"; so this also fixes the code to enforce that. However, we have existing uses of a union type with only one branch, so the 2-or-more strictness is intentionally limited to alternates. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1455778109-6278-3-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
Diffstat (limited to 'tests/qapi-schema')
-rw-r--r--tests/qapi-schema/alternate-empty.err1
-rw-r--r--tests/qapi-schema/alternate-empty.exit2
-rw-r--r--tests/qapi-schema/alternate-empty.json2
-rw-r--r--tests/qapi-schema/alternate-empty.out5
-rw-r--r--tests/qapi-schema/flat-union-empty.err1
-rw-r--r--tests/qapi-schema/flat-union-empty.exit2
-rw-r--r--tests/qapi-schema/flat-union-empty.json2
-rw-r--r--tests/qapi-schema/flat-union-empty.out9
-rw-r--r--tests/qapi-schema/union-empty.err1
-rw-r--r--tests/qapi-schema/union-empty.exit2
-rw-r--r--tests/qapi-schema/union-empty.json2
-rw-r--r--tests/qapi-schema/union-empty.out6
12 files changed, 9 insertions, 26 deletions
diff --git a/tests/qapi-schema/alternate-empty.err b/tests/qapi-schema/alternate-empty.err
index e69de29bb2..bb06c5bfec 100644
--- a/tests/qapi-schema/alternate-empty.err
+++ b/tests/qapi-schema/alternate-empty.err
@@ -0,0 +1 @@
+tests/qapi-schema/alternate-empty.json:2: Alternate 'Alt' should have at least two branches in 'data'
diff --git a/tests/qapi-schema/alternate-empty.exit b/tests/qapi-schema/alternate-empty.exit
index 573541ac97..d00491fd7e 100644
--- a/tests/qapi-schema/alternate-empty.exit
+++ b/tests/qapi-schema/alternate-empty.exit
@@ -1 +1 @@
-0
+1
diff --git a/tests/qapi-schema/alternate-empty.json b/tests/qapi-schema/alternate-empty.json
index db3820f841..fff15baf16 100644
--- a/tests/qapi-schema/alternate-empty.json
+++ b/tests/qapi-schema/alternate-empty.json
@@ -1,2 +1,2 @@
-# FIXME - alternates should list at least two types to be useful
+# alternates must list at least two types to be useful
{ 'alternate': 'Alt', 'data': { 'i': 'int' } }
diff --git a/tests/qapi-schema/alternate-empty.out b/tests/qapi-schema/alternate-empty.out
index f78f174111..e69de29bb2 100644
--- a/tests/qapi-schema/alternate-empty.out
+++ b/tests/qapi-schema/alternate-empty.out
@@ -1,5 +0,0 @@
-object :empty
-alternate Alt
- case i: int
-enum QType ['none', 'qnull', 'qint', 'qstring', 'qdict', 'qlist', 'qfloat', 'qbool']
- prefix QTYPE
diff --git a/tests/qapi-schema/flat-union-empty.err b/tests/qapi-schema/flat-union-empty.err
index e69de29bb2..15754f54eb 100644
--- a/tests/qapi-schema/flat-union-empty.err
+++ b/tests/qapi-schema/flat-union-empty.err
@@ -0,0 +1 @@
+tests/qapi-schema/flat-union-empty.json:4: Union 'Union' cannot have empty 'data'
diff --git a/tests/qapi-schema/flat-union-empty.exit b/tests/qapi-schema/flat-union-empty.exit
index 573541ac97..d00491fd7e 100644
--- a/tests/qapi-schema/flat-union-empty.exit
+++ b/tests/qapi-schema/flat-union-empty.exit
@@ -1 +1 @@
-0
+1
diff --git a/tests/qapi-schema/flat-union-empty.json b/tests/qapi-schema/flat-union-empty.json
index 67dd2978eb..77f1d9abfb 100644
--- a/tests/qapi-schema/flat-union-empty.json
+++ b/tests/qapi-schema/flat-union-empty.json
@@ -1,4 +1,4 @@
-# FIXME - flat unions should not be empty
+# flat unions cannot be empty
{ 'enum': 'Empty', 'data': [ ] }
{ 'struct': 'Base', 'data': { 'type': 'Empty' } }
{ 'union': 'Union', 'base': 'Base', 'discriminator': 'type', 'data': { } }
diff --git a/tests/qapi-schema/flat-union-empty.out b/tests/qapi-schema/flat-union-empty.out
index eade2d5ac6..e69de29bb2 100644
--- a/tests/qapi-schema/flat-union-empty.out
+++ b/tests/qapi-schema/flat-union-empty.out
@@ -1,9 +0,0 @@
-object :empty
-object Base
- member type: Empty optional=False
-enum Empty []
-enum QType ['none', 'qnull', 'qint', 'qstring', 'qdict', 'qlist', 'qfloat', 'qbool']
- prefix QTYPE
-object Union
- base Base
- tag type
diff --git a/tests/qapi-schema/union-empty.err b/tests/qapi-schema/union-empty.err
index e69de29bb2..12c20221bd 100644
--- a/tests/qapi-schema/union-empty.err
+++ b/tests/qapi-schema/union-empty.err
@@ -0,0 +1 @@
+tests/qapi-schema/union-empty.json:2: Union 'Union' cannot have empty 'data'
diff --git a/tests/qapi-schema/union-empty.exit b/tests/qapi-schema/union-empty.exit
index 573541ac97..d00491fd7e 100644
--- a/tests/qapi-schema/union-empty.exit
+++ b/tests/qapi-schema/union-empty.exit
@@ -1 +1 @@
-0
+1
diff --git a/tests/qapi-schema/union-empty.json b/tests/qapi-schema/union-empty.json
index 1785007113..1f0b13ca21 100644
--- a/tests/qapi-schema/union-empty.json
+++ b/tests/qapi-schema/union-empty.json
@@ -1,2 +1,2 @@
-# FIXME - unions should not be empty
+# unions cannot be empty
{ 'union': 'Union', 'data': { } }
diff --git a/tests/qapi-schema/union-empty.out b/tests/qapi-schema/union-empty.out
index bdf17e5b29..e69de29bb2 100644
--- a/tests/qapi-schema/union-empty.out
+++ b/tests/qapi-schema/union-empty.out
@@ -1,6 +0,0 @@
-object :empty
-enum QType ['none', 'qnull', 'qint', 'qstring', 'qdict', 'qlist', 'qfloat', 'qbool']
- prefix QTYPE
-object Union
- member type: UnionKind optional=False
-enum UnionKind []