[Qemu-devel] [PATCH v11 24/28] qapi: Add positive tests to qapi-schema-test

[Eric Blake <eblake@redhat.com>]

Add positive tests to qapi-schema-test for things that were
made possible by recent patches but which caused compile errors
due to collisions prior to that point.  The focus is mainly on
collisions due to names we have reserved for qapi, even though
it is unlikely that anyone will want to abuse these names in
actual .json files.

The added tests includes:
Use of a member name ending in 'Kind' or 'List' [1, 3]
Use of a type name starting with 'has_' [1, 4]
Use of a type named 'u' [1, 5]
Use of a union branch name of 'u' [2, 5]
Use of a union branch name starting with 'has_' [2, 4]

[1] Never broken, but could break if reservations are too strict
[2] Broken prior to commit e4ba22b
[3] See reservations in commit 4dc2e69 and 255960d
[4] See reservations in commit 9fb081e
[5] See reservation in commit 5e59baf

Not worth testing here: we no longer have a collision with a
member named 'base' (commit ddf2190), with a branch named
'type' (commit e4ba22b), or with an alternate member named
'max' (previous commit); these names were more accidental
namespace pollutions than intentional reservations.

Signed-off-by: Eric Blake <eblake@redhat.com>

---
v11 (no v10): drop test of 'max'
v9: reorder in series (was 9/17); fewer tests of 'base' and
'type' non-collision; fold in alternate 'max' test; update commit
message
v8: new, but collects portions of subset B v10 patches 2, 3, and
16 and subset C v7 patch 6 that were deferred to later.

It might be worth dropping or simplifying this patch, depending
on how many corner cases we actually want to test.
---
 tests/qapi-schema/qapi-schema-test.json | 16 ++++++++++++++++
 tests/qapi-schema/qapi-schema-test.out  | 26 ++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/tests/qapi-schema/qapi-schema-test.json b/tests/qapi-schema/qapi-schema-test.json
index 44638da..0f0b5ce 100644
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -113,6 +113,22 @@
             'sizes': ['size'],
             'any': ['any'] } }

+# Even though 'u' and 'has_*' are forbidden as struct member names, they
+# should still be valid as a type or union branch name. And although
+# '*Kind' and '*List' are forbidden as type names, they should not be
+# forbidden as a member or branch name.  Flat union branches do not
+# collide with base members.
+{ 'enum': 'EnumName', 'data': [ 'value1', 'has_a', 'u' ] }
+{ 'struct': 'has_a', 'data': { 'MyKind': 'int', 'MyList': ['int'],
+                               'value1': 'EnumName' } }
+{ 'union': 'u', 'data': { 'u': 'uint8', 'myKind': 'has_a',
+                          'myList': 'has_a', 'has_a': 'has_a' } }
+{ 'union': 'UnionName', 'base': 'has_a', 'discriminator': 'value1',
+  'data': { 'value1': 'UserDefZero', 'has_a': 'UserDefZero',
+            'u': 'UserDefZero' } }
+{ 'alternate': 'AltName', 'data': { 'type': 'int', 'u': 'bool',
+                                    'myKind': 'has_a' } }
+
 # testing commands
 { 'command': 'user_def_cmd', 'data': {} }
 { 'command': 'user_def_cmd1', 'data': {'ud1a': 'UserDefOne'} }
diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out
index 6f2edcc..74da413 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -22,6 +22,8 @@ object :obj-guest-get-time-arg
     member b: int optional=True
 object :obj-guest-sync-arg
     member arg: any optional=False
+object :obj-has_a-wrapper
+    member data: has_a optional=False
 object :obj-int16List-wrapper
     member data: int16List optional=False
 object :obj-int32List-wrapper
@@ -46,6 +48,8 @@ object :obj-uint32List-wrapper
     member data: uint32List optional=False
 object :obj-uint64List-wrapper
     member data: uint64List optional=False
+object :obj-uint8-wrapper
+    member data: uint8 optional=False
 object :obj-uint8List-wrapper
     member data: uint8List optional=False
 object :obj-user_def_cmd1-arg
@@ -56,6 +60,10 @@ object :obj-user_def_cmd2-arg
 alternate AltIntNum
     case i: int
     case n: number
+alternate AltName
+    case type: int
+    case u: bool
+    case myKind: has_a
 alternate AltNumInt
     case n: number
     case i: int
@@ -78,6 +86,7 @@ event EVENT_D :obj-EVENT_D-arg
 object Empty1
 object Empty2
     base Empty1
+enum EnumName ['value1', 'has_a', 'u']
 enum EnumOne ['value1', 'value2', 'value3']
 object EventStructOne
     member struct1: UserDefOne optional=False
@@ -101,6 +110,12 @@ object TestStruct
     member integer: int optional=False
     member boolean: bool optional=False
     member string: str optional=False
+object UnionName
+    base has_a
+    tag value1
+    case value1: UserDefZero
+    case has_a: UserDefZero
+    case u: UserDefZero
 object UserDefA
     member boolean: bool optional=False
     member a_b: int optional=True
@@ -195,6 +210,17 @@ command guest-get-time :obj-guest-get-time-arg -> int
    gen=True success_response=True
 command guest-sync :obj-guest-sync-arg -> any
    gen=True success_response=True
+object has_a
+    member MyKind: int optional=False
+    member MyList: intList optional=False
+    member value1: EnumName optional=False
+object u
+    member type: uKind optional=False
+    case u: :obj-uint8-wrapper
+    case myKind: :obj-has_a-wrapper
+    case myList: :obj-has_a-wrapper
+    case has_a: :obj-has_a-wrapper
+enum uKind ['u', 'myKind', 'myList', 'has_a']
 command user_def_cmd None -> None
    gen=True success_response=True
 command user_def_cmd1 :obj-user_def_cmd1-arg -> None
-- 
2.4.3