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authorEric Blake <eblake@redhat.com>2015-10-26 16:34:49 -0600
committerMarkus Armbruster <armbru@redhat.com>2015-11-02 08:30:26 +0100
commitddf21908961073199f3d186204da4810f2ea150b (patch)
treeb41616cf59ec2f331108dfeb8311ba7e6504e156 /tests/qapi-schema
parent30594fe1cd4355626e73b80645428105d0df3cf6 (diff)
qapi: Unbox base members
Rather than storing a base class as a pointer to a box, just store the fields of that base class in the same order, so that a child struct can be directly cast to its parent. This gives less malloc overhead, less pointer dereferencing, and even less generated code. Compare to the earlier commit 1e6c1616a "qapi: Generate a nicer struct for flat unions" (although that patch had fewer places to change, as less of qemu was directly using qapi structs for flat unions). It also allows us to turn on automatic type-safe wrappers for upcasting to the base class of a struct. Changes to the generated code look like this in qapi-types.h: | struct SpiceChannel { |- SpiceBasicInfo *base; |+ /* Members inherited from SpiceBasicInfo: */ |+ char *host; |+ char *port; |+ NetworkAddressFamily family; |+ /* Own members: */ | int64_t connection_id; as well as additional upcast functions like qapi_SpiceChannel_base(). Meanwhile, changes to qapi-visit.c look like: | static void visit_type_SpiceChannel_fields(Visitor *v, SpiceChannel **obj, Error **errp) | { | Error *err = NULL; | |- visit_type_implicit_SpiceBasicInfo(v, &(*obj)->base, &err); |+ visit_type_SpiceBasicInfo_fields(v, (SpiceBasicInfo **)obj, &err); | if (err) { (the cast is necessary, since our upcast wrappers only deal with a single pointer, not pointer-to-pointer); plus the wholesale elimination of some now-unused visit_type_implicit_FOO() functions. Without boxing, the corner case of one empty struct having another empty struct as its base type now requires inserting a dummy member (previously, the 'Base *base' member sufficed). And now that we no longer consume a 'base' member in the generated C struct, we can delete the former negative struct-base-clash-base test. Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1445898903-12082-11-git-send-email-eblake@redhat.com> [Commit message tweaked slightly] Signed-off-by: Markus Armbruster <armbru@redhat.com>
Diffstat (limited to 'tests/qapi-schema')
-rw-r--r--tests/qapi-schema/struct-base-clash-base.err0
-rw-r--r--tests/qapi-schema/struct-base-clash-base.exit1
-rw-r--r--tests/qapi-schema/struct-base-clash-base.json9
-rw-r--r--tests/qapi-schema/struct-base-clash-base.out5
4 files changed, 0 insertions, 15 deletions
diff --git a/tests/qapi-schema/struct-base-clash-base.err b/tests/qapi-schema/struct-base-clash-base.err
deleted file mode 100644
index e69de29bb2..0000000000
--- a/tests/qapi-schema/struct-base-clash-base.err
+++ /dev/null
diff --git a/tests/qapi-schema/struct-base-clash-base.exit b/tests/qapi-schema/struct-base-clash-base.exit
deleted file mode 100644
index 573541ac97..0000000000
--- a/tests/qapi-schema/struct-base-clash-base.exit
+++ /dev/null
@@ -1 +0,0 @@
-0
diff --git a/tests/qapi-schema/struct-base-clash-base.json b/tests/qapi-schema/struct-base-clash-base.json
deleted file mode 100644
index 0c840258c9..0000000000
--- a/tests/qapi-schema/struct-base-clash-base.json
+++ /dev/null
@@ -1,9 +0,0 @@
-# Struct member 'base'
-# FIXME: this parses, but then fails to compile due to a duplicate 'base'
-# (one explicit in QMP, the other used to box the base class members).
-# We should either reject the collision at parse time, or change the
-# generated struct to allow this to compile.
-{ 'struct': 'Base', 'data': {} }
-{ 'struct': 'Sub',
- 'base': 'Base',
- 'data': { 'base': 'str' } }
diff --git a/tests/qapi-schema/struct-base-clash-base.out b/tests/qapi-schema/struct-base-clash-base.out
deleted file mode 100644
index e69a416560..0000000000
--- a/tests/qapi-schema/struct-base-clash-base.out
+++ /dev/null
@@ -1,5 +0,0 @@
-object :empty
-object Base
-object Sub
- base Base
- member base: str optional=False