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authorEric Blake <eblake@redhat.com>2015-09-29 16:21:05 -0600
committerMarkus Armbruster <armbru@redhat.com>2015-10-12 18:44:54 +0200
commit8d25dd101f759425456b8005b3180062689d71e7 (patch)
tree1ff4f54a72b4aefc872416372b30c8027fadc8e3 /tests/qapi-schema
parent7b2a5c2f9a52c4a08630fa741052f03fe5d3cc8a (diff)
qapi: Add tests for empty unions
The documentation claims that alternates are useful for allowing two or more types, although nothing enforces this. Meanwhile, it is silent on whether empty unions are allowed. In practice, the generated code will compile, in part because we have a 'void *data' branch; but attempting to visit such a type will cause an abort(). While there's no technical reason that a degenerate union could not be made to work, it's harder to justify the time spent in chasing known (the current abort() during visit) and unknown corner cases, than it would be to just outlaw them. A future patch will probably take the approach of forbidding them; in the meantime, we can at least add testsuite coverage to make it obvious where things stand. In addition to adding tests to expose the problems, we also need to adjust existing tests that are meant to test something else, but which could fail for the wrong reason if we reject degenerate alternates/unions. Note that empty structs are explicitly supported (for example, right now they are the only way to specify that one branch of a flat union adds no additional members), and empty enums are covered by the testsuite as working (even if they do not seem to have much use). Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1443565276-4535-8-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.err0
-rw-r--r--tests/qapi-schema/alternate-empty.exit1
-rw-r--r--tests/qapi-schema/alternate-empty.json2
-rw-r--r--tests/qapi-schema/alternate-empty.out4
-rw-r--r--tests/qapi-schema/alternate-nested.json2
-rw-r--r--tests/qapi-schema/alternate-unknown.json2
-rw-r--r--tests/qapi-schema/flat-union-empty.err0
-rw-r--r--tests/qapi-schema/flat-union-empty.exit1
-rw-r--r--tests/qapi-schema/flat-union-empty.json4
-rw-r--r--tests/qapi-schema/flat-union-empty.out7
-rw-r--r--tests/qapi-schema/union-empty.err0
-rw-r--r--tests/qapi-schema/union-empty.exit1
-rw-r--r--tests/qapi-schema/union-empty.json2
-rw-r--r--tests/qapi-schema/union-empty.out3
14 files changed, 27 insertions, 2 deletions
diff --git a/tests/qapi-schema/alternate-empty.err b/tests/qapi-schema/alternate-empty.err
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/qapi-schema/alternate-empty.err
diff --git a/tests/qapi-schema/alternate-empty.exit b/tests/qapi-schema/alternate-empty.exit
new file mode 100644
index 0000000000..573541ac97
--- /dev/null
+++ b/tests/qapi-schema/alternate-empty.exit
@@ -0,0 +1 @@
+0
diff --git a/tests/qapi-schema/alternate-empty.json b/tests/qapi-schema/alternate-empty.json
new file mode 100644
index 0000000000..db3820f841
--- /dev/null
+++ b/tests/qapi-schema/alternate-empty.json
@@ -0,0 +1,2 @@
+# FIXME - alternates should 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
new file mode 100644
index 0000000000..0f153b6f60
--- /dev/null
+++ b/tests/qapi-schema/alternate-empty.out
@@ -0,0 +1,4 @@
+object :empty
+alternate Alt
+ case i: int
+enum AltKind ['i']
diff --git a/tests/qapi-schema/alternate-nested.json b/tests/qapi-schema/alternate-nested.json
index c4233b9f33..8e22186491 100644
--- a/tests/qapi-schema/alternate-nested.json
+++ b/tests/qapi-schema/alternate-nested.json
@@ -2,4 +2,4 @@
{ 'alternate': 'Alt1',
'data': { 'name': 'str', 'value': 'int' } }
{ 'alternate': 'Alt2',
- 'data': { 'nested': 'Alt1' } }
+ 'data': { 'nested': 'Alt1', 'b': 'bool' } }
diff --git a/tests/qapi-schema/alternate-unknown.json b/tests/qapi-schema/alternate-unknown.json
index ad5c103028..08c80dced0 100644
--- a/tests/qapi-schema/alternate-unknown.json
+++ b/tests/qapi-schema/alternate-unknown.json
@@ -1,3 +1,3 @@
# we reject an alternate with unknown type in branch
{ 'alternate': 'Alt',
- 'data': { 'unknown': 'MissingType' } }
+ 'data': { 'unknown': 'MissingType', 'i': 'int' } }
diff --git a/tests/qapi-schema/flat-union-empty.err b/tests/qapi-schema/flat-union-empty.err
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/qapi-schema/flat-union-empty.err
diff --git a/tests/qapi-schema/flat-union-empty.exit b/tests/qapi-schema/flat-union-empty.exit
new file mode 100644
index 0000000000..573541ac97
--- /dev/null
+++ b/tests/qapi-schema/flat-union-empty.exit
@@ -0,0 +1 @@
+0
diff --git a/tests/qapi-schema/flat-union-empty.json b/tests/qapi-schema/flat-union-empty.json
new file mode 100644
index 0000000000..67dd2978eb
--- /dev/null
+++ b/tests/qapi-schema/flat-union-empty.json
@@ -0,0 +1,4 @@
+# FIXME - flat unions should not 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
new file mode 100644
index 0000000000..0e0665af3b
--- /dev/null
+++ b/tests/qapi-schema/flat-union-empty.out
@@ -0,0 +1,7 @@
+object :empty
+object Base
+ member type: Empty optional=False
+enum Empty []
+object Union
+ base Base
+ tag type
diff --git a/tests/qapi-schema/union-empty.err b/tests/qapi-schema/union-empty.err
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/qapi-schema/union-empty.err
diff --git a/tests/qapi-schema/union-empty.exit b/tests/qapi-schema/union-empty.exit
new file mode 100644
index 0000000000..573541ac97
--- /dev/null
+++ b/tests/qapi-schema/union-empty.exit
@@ -0,0 +1 @@
+0
diff --git a/tests/qapi-schema/union-empty.json b/tests/qapi-schema/union-empty.json
new file mode 100644
index 0000000000..1785007113
--- /dev/null
+++ b/tests/qapi-schema/union-empty.json
@@ -0,0 +1,2 @@
+# FIXME - unions should not be empty
+{ 'union': 'Union', 'data': { } }
diff --git a/tests/qapi-schema/union-empty.out b/tests/qapi-schema/union-empty.out
new file mode 100644
index 0000000000..8b5a7bf585
--- /dev/null
+++ b/tests/qapi-schema/union-empty.out
@@ -0,0 +1,3 @@
+object :empty
+object Union
+enum UnionKind []