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qemu/scripts/qapi-types.py
Kevin Wolf 622f557f5a qapi-types/visit.py: Inheritance for structs 
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 <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
2013-10-11 16:50:01 +02:00

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#
# QAPI types generator
#
# Copyright IBM, Corp. 2011
#
# Authors:
# Anthony Liguori <aliguori@us.ibm.com>
#
# This work is licensed under the terms of the GNU GPLv2.
# See the COPYING.LIB file in the top-level directory.
from ordereddict import OrderedDict
from qapi import *
import sys
import os
import getopt
import errno
def generate_fwd_struct(name, members, builtin_type=False):
if builtin_type:
return mcgen('''
typedef struct %(name)sList
{
union {
%(type)s value;
uint64_t padding;
};
struct %(name)sList *next;
} %(name)sList;
''',
type=c_type(name),
name=name)
return mcgen('''
typedef struct %(name)s %(name)s;
typedef struct %(name)sList
{
union {
%(name)s *value;
uint64_t padding;
};
struct %(name)sList *next;
} %(name)sList;
''',
name=name)
def generate_fwd_enum_struct(name, members):
return mcgen('''
typedef struct %(name)sList
{
union {
%(name)s value;
uint64_t padding;
};
struct %(name)sList *next;
} %(name)sList;
''',
name=name)
def generate_struct_fields(members):
ret = ''
for argname, argentry, optional, structured in parse_args(members):
if optional:
ret += mcgen('''
bool has_%(c_name)s;
''',
c_name=c_var(argname))
if structured:
push_indent()
ret += generate_struct({ "field": argname, "data": argentry})
pop_indent()
else:
ret += mcgen('''
%(c_type)s %(c_name)s;
''',
c_type=c_type(argentry), c_name=c_var(argname))
return ret
def generate_struct(expr):
structname = expr.get('type', "")
fieldname = expr.get('field', "")
members = expr['data']
base = expr.get('base')
ret = mcgen('''
struct %(name)s
{
''',
name=structname)
if base:
ret += generate_struct_fields({'base': base})
ret += generate_struct_fields(members)
if len(fieldname):
fieldname = " " + fieldname
ret += mcgen('''
}%(field)s;
''',
field=fieldname)
return ret
def generate_enum_lookup(name, values):
ret = mcgen('''
const char *%(name)s_lookup[] = {
''',
name=name)
i = 0
for value in values:
ret += mcgen('''
"%(value)s",
''',
value=value)
ret += mcgen('''
NULL,
};
''')
return ret
def generate_enum_name(name):
if name.isupper():
return c_fun(name, False)
new_name = ''
for c in c_fun(name, False):
if c.isupper():
new_name += '_'
new_name += c
return new_name.lstrip('_').upper()
def generate_enum(name, values):
lookup_decl = mcgen('''
extern const char *%(name)s_lookup[];
''',
name=name)
enum_decl = mcgen('''
typedef enum %(name)s
{
''',
name=name)
# append automatically generated _MAX value
enum_values = values + [ 'MAX' ]
i = 0
for value in enum_values:
enum_decl += mcgen('''
%(abbrev)s_%(value)s = %(i)d,
''',
abbrev=de_camel_case(name).upper(),
value=generate_enum_name(value),
i=i)
i += 1
enum_decl += mcgen('''
} %(name)s;
''',
name=name)
return lookup_decl + enum_decl
def generate_anon_union_qtypes(expr):
name = expr['union']
members = expr['data']
ret = mcgen('''
const int %(name)s_qtypes[QTYPE_MAX] = {
''',
name=name)
for key in members:
qapi_type = members[key]
if builtin_type_qtypes.has_key(qapi_type):
qtype = builtin_type_qtypes[qapi_type]
elif find_struct(qapi_type):
qtype = "QTYPE_QDICT"
elif find_union(qapi_type):
qtype = "QTYPE_QDICT"
else:
assert False, "Invalid anonymous union member"
ret += mcgen('''
[ %(qtype)s ] = %(abbrev)s_KIND_%(enum)s,
''',
qtype = qtype,
abbrev = de_camel_case(name).upper(),
enum = c_fun(de_camel_case(key),False).upper())
ret += mcgen('''
};
''')
return ret
def generate_union(expr):
name = expr['union']
typeinfo = expr['data']
base = expr.get('base')
discriminator = expr.get('discriminator')
ret = mcgen('''
struct %(name)s
{
%(name)sKind kind;
union {
void *data;
''',
name=name)
for key in typeinfo:
ret += mcgen('''
%(c_type)s %(c_name)s;
''',
c_type=c_type(typeinfo[key]),
c_name=c_fun(key))
ret += mcgen('''
};
''')
if base:
base_fields = find_struct(base)['data']
if discriminator:
base_fields = base_fields.copy()
del base_fields[discriminator]
ret += generate_struct_fields(base_fields)
else:
assert not discriminator
ret += mcgen('''
};
''')
if discriminator == {}:
ret += mcgen('''
extern const int %(name)s_qtypes[];
''',
name=name)
return ret
def generate_type_cleanup_decl(name):
ret = mcgen('''
void qapi_free_%(type)s(%(c_type)s obj);
''',
c_type=c_type(name),type=name)
return ret
def generate_type_cleanup(name):
ret = mcgen('''
void qapi_free_%(type)s(%(c_type)s obj)
{
QapiDeallocVisitor *md;
Visitor *v;
if (!obj) {
return;
}
md = qapi_dealloc_visitor_new();
v = qapi_dealloc_get_visitor(md);
visit_type_%(type)s(v, &obj, NULL, NULL);
qapi_dealloc_visitor_cleanup(md);
}
''',
c_type=c_type(name),type=name)
return ret
try:
opts, args = getopt.gnu_getopt(sys.argv[1:], "chbp:o:",
["source", "header", "builtins",
"prefix=", "output-dir="])
except getopt.GetoptError, err:
print str(err)
sys.exit(1)
output_dir = ""
prefix = ""
c_file = 'qapi-types.c'
h_file = 'qapi-types.h'
do_c = False
do_h = False
do_builtins = False
for o, a in opts:
if o in ("-p", "--prefix"):
prefix = a
elif o in ("-o", "--output-dir"):
output_dir = a + "/"
elif o in ("-c", "--source"):
do_c = True
elif o in ("-h", "--header"):
do_h = True
elif o in ("-b", "--builtins"):
do_builtins = True
if not do_c and not do_h:
do_c = True
do_h = True
c_file = output_dir + prefix + c_file
h_file = output_dir + prefix + h_file
try:
os.makedirs(output_dir)
except os.error, e:
if e.errno != errno.EEXIST:
raise
def maybe_open(really, name, opt):
if really:
return open(name, opt)
else:
import StringIO
return StringIO.StringIO()
fdef = maybe_open(do_c, c_file, 'w')
fdecl = maybe_open(do_h, h_file, 'w')
fdef.write(mcgen('''
/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
/*
* deallocation functions for schema-defined QAPI types
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Michael Roth <mdroth@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#include "qapi/dealloc-visitor.h"
#include "%(prefix)sqapi-types.h"
#include "%(prefix)sqapi-visit.h"
''', prefix=prefix))
fdecl.write(mcgen('''
/* AUTOMATICALLY GENERATED, DO NOT MODIFY */
/*
* schema-defined QAPI types
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#ifndef %(guard)s
#define %(guard)s
#include <stdbool.h>
#include <stdint.h>
''',
guard=guardname(h_file)))
exprs = parse_schema(sys.stdin)
exprs = filter(lambda expr: not expr.has_key('gen'), exprs)
fdecl.write(guardstart("QAPI_TYPES_BUILTIN_STRUCT_DECL"))
for typename in builtin_types:
fdecl.write(generate_fwd_struct(typename, None, builtin_type=True))
fdecl.write(guardend("QAPI_TYPES_BUILTIN_STRUCT_DECL"))
for expr in exprs:
ret = "\n"
if expr.has_key('type'):
ret += generate_fwd_struct(expr['type'], expr['data'])
elif expr.has_key('enum'):
ret += generate_enum(expr['enum'], expr['data']) + "\n"
ret += generate_fwd_enum_struct(expr['enum'], expr['data'])
fdef.write(generate_enum_lookup(expr['enum'], expr['data']))
elif expr.has_key('union'):
ret += generate_fwd_struct(expr['union'], expr['data']) + "\n"
ret += generate_enum('%sKind' % expr['union'], expr['data'].keys())
fdef.write(generate_enum_lookup('%sKind' % expr['union'], expr['data'].keys()))
if expr.get('discriminator') == {}:
fdef.write(generate_anon_union_qtypes(expr))
else:
continue
fdecl.write(ret)
# to avoid header dependency hell, we always generate declarations
# for built-in types in our header files and simply guard them
fdecl.write(guardstart("QAPI_TYPES_BUILTIN_CLEANUP_DECL"))
for typename in builtin_types:
fdecl.write(generate_type_cleanup_decl(typename + "List"))
fdecl.write(guardend("QAPI_TYPES_BUILTIN_CLEANUP_DECL"))
# ...this doesn't work for cases where we link in multiple objects that
# have the functions defined, so we use -b option to provide control
# over these cases
if do_builtins:
fdef.write(guardstart("QAPI_TYPES_BUILTIN_CLEANUP_DEF"))
for typename in builtin_types:
fdef.write(generate_type_cleanup(typename + "List"))
fdef.write(guardend("QAPI_TYPES_BUILTIN_CLEANUP_DEF"))
for expr in exprs:
ret = "\n"
if expr.has_key('type'):
ret += generate_struct(expr) + "\n"
ret += generate_type_cleanup_decl(expr['type'] + "List")
fdef.write(generate_type_cleanup(expr['type'] + "List") + "\n")
ret += generate_type_cleanup_decl(expr['type'])
fdef.write(generate_type_cleanup(expr['type']) + "\n")
elif expr.has_key('union'):
ret += generate_union(expr)
ret += generate_type_cleanup_decl(expr['union'] + "List")
fdef.write(generate_type_cleanup(expr['union'] + "List") + "\n")
ret += generate_type_cleanup_decl(expr['union'])
fdef.write(generate_type_cleanup(expr['union']) + "\n")
elif expr.has_key('enum'):
ret += generate_type_cleanup_decl(expr['enum'] + "List")
fdef.write(generate_type_cleanup(expr['enum'] + "List") + "\n")
else:
continue
fdecl.write(ret)
fdecl.write('''
#endif
''')
fdecl.flush()
fdecl.close()
fdef.flush()
fdef.close()
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