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[Qemu-devel] [PATCH v2 02/17] qapi-types/visit.py: Inheritance for struc
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH v2 02/17] qapi-types/visit.py: Inheritance for structs |
Date: |
Tue, 1 Oct 2013 15:20:04 +0200 |
This introduces a new 'base' key for struct definitions that refers to
another struct type. On the JSON level, the fields of the base type are
included directly into the same namespace as the fields of the defined
type, like with unions. On the C level, a pointer to a struct of the
base type is included.
Signed-off-by: Kevin Wolf <address@hidden>
---
docs/qapi-code-gen.txt | 17 +++++++++++++++++
scripts/qapi-types.py | 4 ++++
scripts/qapi-visit.py | 18 ++++++++++++++++--
3 files changed, 37 insertions(+), 2 deletions(-)
diff --git a/docs/qapi-code-gen.txt b/docs/qapi-code-gen.txt
index 0ce045c..91f44d0 100644
--- a/docs/qapi-code-gen.txt
+++ b/docs/qapi-code-gen.txt
@@ -53,6 +53,23 @@ The use of '*' as a prefix to the name means the member is
optional. Optional
members should always be added to the end of the dictionary to preserve
backwards compatibility.
+
+A complex type definition can specify another complex type as its base.
+In this case, the fields of the base type are included as top-level fields
+of the new complex type's dictionary in the QMP wire format. An example
+definition is:
+
+ { 'type': 'BlockdevOptionsGenericFormat', 'data': { 'file': 'str' } }
+ { 'type': 'BlockdevOptionsGenericCOWFormat',
+ 'base': 'BlockdevOptionsGenericFormat',
+ 'data': { '*backing': 'str' } }
+
+An example BlockdevOptionsGenericCOWFormat object on the wire could use
+both fields like this:
+
+ { "file": "/some/place/my-image",
+ "backing": "/some/place/my-backing-file" }
+
=== Enumeration types ===
An enumeration type is a dictionary containing a single key whose value is a
diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index 566fe5e..4a1652b 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -86,6 +86,7 @@ def generate_struct(expr):
structname = expr.get('type', "")
fieldname = expr.get('field', "")
members = expr['data']
+ base = expr.get('base')
ret = mcgen('''
struct %(name)s
@@ -93,6 +94,9 @@ struct %(name)s
''',
name=structname)
+ if base:
+ ret += generate_struct_fields({'base': base})
+
ret += generate_struct_fields(members)
if len(fieldname):
diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 1e44004..c39e628 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -17,7 +17,7 @@ import os
import getopt
import errno
-def generate_visit_struct_fields(name, field_prefix, fn_prefix, members):
+def generate_visit_struct_fields(name, field_prefix, fn_prefix, members, base
= None):
substructs = []
ret = ''
full_name = name if not fn_prefix else "%s_%s" % (name, fn_prefix)
@@ -42,6 +42,19 @@ static void visit_type_%(full_name)s_fields(Visitor *m,
%(name)s ** obj, Error *
name=name, full_name=full_name)
push_indent()
+ if base:
+ ret += mcgen('''
+visit_start_implicit_struct(m, obj ? (void**) &(*obj)->%(c_name)s : NULL,
sizeof(%(type)s), &err);
+if (!err) {
+ visit_type_%(type)s_fields(m, obj ? &(*obj)->%(c_prefix)s%(c_name)s :
NULL, &err);
+ error_propagate(errp, err);
+ err = NULL;
+ visit_end_implicit_struct(m, &err);
+}
+''',
+ c_prefix=c_var(field_prefix),
+ type=type_name(base), c_name=c_var('base'))
+
for argname, argentry, optional, structured in parse_args(members):
if optional:
ret += mcgen('''
@@ -124,8 +137,9 @@ def generate_visit_struct(expr):
name = expr['type']
members = expr['data']
+ base = expr.get('base')
- ret = generate_visit_struct_fields(name, "", "", members)
+ ret = generate_visit_struct_fields(name, "", "", members, base)
ret += mcgen('''
--
1.8.1.4
- [Qemu-devel] [PATCH v2 00/17] blockdev-add QMP command, Kevin Wolf, 2013/10/01
- [Qemu-devel] [PATCH v2 01/17] qapi-types/visit.py: Pass whole expr dict for structs, Kevin Wolf, 2013/10/01
- [Qemu-devel] [PATCH v2 02/17] qapi-types/visit.py: Inheritance for structs,
Kevin Wolf <=
- [Qemu-devel] [PATCH v2 04/17] blockdev: 'blockdev-add' QMP command, Kevin Wolf, 2013/10/01
- [Qemu-devel] [PATCH v2 06/17] blockdev: Pass QDict to blockdev_init(), Kevin Wolf, 2013/10/01
- [Qemu-devel] [PATCH v2 05/17] blockdev: Separate ID generation from DriveInfo creation, Kevin Wolf, 2013/10/01
- [Qemu-devel] [PATCH v2 10/17] blockdev: Move parsing of 'boot' option to drive_init, Kevin Wolf, 2013/10/01
- [Qemu-devel] [PATCH v2 09/17] blockdev: Moving parsing of geometry options to drive_init, Kevin Wolf, 2013/10/01