[Qemu-devel] [PATCH v5 15/46] qapi: Defer duplicate member checks to schema check()

[Eric Blake <eblake@redhat.com>]

With the previous commit, we have two different locations for
detecting member name clashes - one at parse time, and another
at schema check() time.  Consolidate the checks into a single
place, which is also in line with our TODO to eventually defer
all of the parse time semantic checking into the newer schema
code.  The check_member_clash() function is no longer needed.

The wording of the error messages has changed, but should still
convey enough information to not be termed a regression.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 scripts/qapi.py                               | 45 ++++++++++-----------------
 tests/qapi-schema/flat-union-branch-clash.err |  2 +-
 tests/qapi-schema/flat-union-cycle.err        |  2 +-
 tests/qapi-schema/struct-base-clash-deep.err  |  2 +-
 tests/qapi-schema/struct-base-clash.err       |  2 +-
 5 files changed, 21 insertions(+), 32 deletions(-)

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 0a0ac90..f5f1c60 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -499,21 +499,6 @@ def check_type(expr_info, source, value, allow_array=False,
                                 'enum'])


-def check_member_clash(expr_info, base_name, data, source=""):
-    base = find_struct(base_name)
-    assert base
-    base_members = base['data']
-    for key in data.keys():
-        if key.startswith('*'):
-            key = key[1:]
-        if key in base_members or "*" + key in base_members:
-            raise QAPIExprError(expr_info,
-                                "Member name '%s'%s clashes with base '%s'"
-                                % (key, source, base_name))
-    if base.get('base'):
-        check_member_clash(expr_info, base['base'], data, source)
-
-
 def check_command(expr, expr_info):
     name = expr['command']

@@ -592,15 +577,9 @@ def check_union(expr, expr_info):
     for (key, value) in members.items():
         check_name(expr_info, "Member of union '%s'" % name, key)

-        # Each value must name a known type; furthermore, in flat unions,
-        # branches must be a struct with no overlapping member names
+        # Each value must name a known type
         check_type(expr_info, "Member '%s' of union '%s'" % (key, name),
                    value, allow_array=not base, allow_metas=allow_metas)
-        if base:
-            branch_struct = find_struct(value)
-            assert branch_struct
-            check_member_clash(expr_info, base, branch_struct['data'],
-                               " of branch '%s'" % key)

         # If the discriminator names an enum type, then all members
         # of 'data' must also be members of the enum type.
@@ -684,8 +663,6 @@ def check_struct(expr, expr_info):
                allow_dict=True, allow_optional=True)
     check_type(expr_info, "'base' for struct '%s'" % name, expr.get('base'),
                allow_metas=['struct'])
-    if expr.get('base'):
-        check_member_clash(expr_info, expr['base'], expr['data'])


 def check_keys(expr_elem, meta, required, optional=[]):
@@ -999,7 +976,7 @@ class QAPISchemaObjectTypeMember(object):
         self.optional = optional
         self._owner = owner

-    def check(self, schema, info, all_members, seen):
+    def check(self, schema, info, all_members, seen, flat=False):
         if self.c_name() in seen:
             raise QAPIExprError(info,
                                 "%s collides with %s"
@@ -1007,6 +984,17 @@ class QAPISchemaObjectTypeMember(object):
                                    seen[self.c_name()].describe()))
         self.type = schema.lookup_type(self._type_name)
         assert self.type
+        if flat:
+            self.type.check(schema)
+            assert isinstance(self.type.members, list)
+            assert not self.type.variants    # not implemented
+            for m in self.type.members:
+                if m.c_name() in seen:
+                    raise QAPIExprError(info,
+                                        "Member '%s' of branch '%s' collides "
+                                        "with %s"
+                                        % (m.name, self.name,
+                                           seen[m.c_name()].describe()))
         all_members.append(self)
         seen[self.c_name()] = self

@@ -1042,15 +1030,16 @@ class QAPISchemaObjectTypeVariants(object):
         assert isinstance(self.tag_member.type, QAPISchemaEnumType)
         for v in self.variants:
             vseen = dict(seen)
-            v.check(schema, info, self.tag_member.type, vseen)
+            v.check(schema, info, self.tag_member.type, vseen,
+                    self.tag_name is not None)


 class QAPISchemaObjectTypeVariant(QAPISchemaObjectTypeMember):
     def __init__(self, name, typ, owner):
         QAPISchemaObjectTypeMember.__init__(self, name, typ, False, owner)

-    def check(self, schema, info, tag_type, seen):
-        QAPISchemaObjectTypeMember.check(self, schema, info, [], seen)
+    def check(self, schema, info, tag_type, seen, flat):
+        QAPISchemaObjectTypeMember.check(self, schema, info, [], seen, flat)
         assert self.name in tag_type.values

     def describe(self):
diff --git a/tests/qapi-schema/flat-union-branch-clash.err b/tests/qapi-schema/flat-union-branch-clash.err
index f112766..e220ea4 100644
--- a/tests/qapi-schema/flat-union-branch-clash.err
+++ b/tests/qapi-schema/flat-union-branch-clash.err
@@ -1 +1 @@
-tests/qapi-schema/flat-union-branch-clash.json:10: Member name 'name' of branch 'value1' clashes with base 'Base'
+tests/qapi-schema/flat-union-branch-clash.json:10: Member 'name' of branch 'value1' collides with 'name' (member of Base)
diff --git a/tests/qapi-schema/flat-union-cycle.err b/tests/qapi-schema/flat-union-cycle.err
index 152c6f0..5b431d7 100644
--- a/tests/qapi-schema/flat-union-cycle.err
+++ b/tests/qapi-schema/flat-union-cycle.err
@@ -1 +1 @@
-tests/qapi-schema/flat-union-cycle.json:5: Member name 'switch' of branch 'loop' clashes with base 'Base'
+tests/qapi-schema/flat-union-cycle.json:5: Member 'switch' of branch 'loop' collides with 'switch' (member of Base)
diff --git a/tests/qapi-schema/struct-base-clash-deep.err b/tests/qapi-schema/struct-base-clash-deep.err
index e3e9f8d..280fa03 100644
--- a/tests/qapi-schema/struct-base-clash-deep.err
+++ b/tests/qapi-schema/struct-base-clash-deep.err
@@ -1 +1 @@
-tests/qapi-schema/struct-base-clash-deep.json:7: Member name 'name' clashes with base 'Base'
+tests/qapi-schema/struct-base-clash-deep.json:7: 'name' (member of Sub) collides with 'name' (member of Base)
diff --git a/tests/qapi-schema/struct-base-clash.err b/tests/qapi-schema/struct-base-clash.err
index 3ac37fb..2d5ceb0 100644
--- a/tests/qapi-schema/struct-base-clash.err
+++ b/tests/qapi-schema/struct-base-clash.err
@@ -1 +1 @@
-tests/qapi-schema/struct-base-clash.json:4: Member name 'name' clashes with base 'Base'
+tests/qapi-schema/struct-base-clash.json:4: 'name' (member of Sub) collides with 'name' (member of Base)
-- 
2.4.3