Currently QAPI generates a type and function for free'ing it: typedef struct QCryptoBlockCreateOptions QCryptoBlockCreateOptions; void qapi_free_QCryptoBlockCreateOptions(QCryptoBlockCreateOptions *obj); This is used in the traditional manner: QCryptoBlockCreateOptions *opts = NULL; opts = g_new0(QCryptoBlockCreateOptions, 1); ....do stuff with opts... qapi_free_QCryptoBlockCreateOptions(opts); Since bumping the min glib to 2.48, QEMU has incrementally adopted the use of g_auto/g_autoptr. This allows the compiler to run a function to free a variable when it goes out of scope, the benefit being the compiler can guarantee it is freed in all possible code ptahs. This benefit is applicable to QAPI types too, and given the seriously long method names for some qapi_free_XXXX() functions, is much less typing. This change thus makes the code generator emit: G_DEFINE_AUTOPTR_CLEANUP_FUNC(QCryptoBlockCreateOptions, qapi_free_QCryptoBlockCreateOptions) The above code example now becomes g_autoptr(QCryptoBlockCreateOptions) opts = NULL; opts = g_new0(QCryptoBlockCreateOptions, 1); ....do stuff with opts... Note, if the local pointer needs to live beyond the scope holding the variable, then g_steal_pointer can be used. This is useful to return the pointer to the caller in the success codepath, while letting it be freed in all error codepaths. return g_steal_pointer(&opts); The crypto/block.h header needs updating to avoid symbol clash now that the g_autoptr support is a standard QAPI feature. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20200723153845.2934357-1-berrange@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
323 lines
8.6 KiB
Python
323 lines
8.6 KiB
Python
"""
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QAPI types generator
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Copyright IBM, Corp. 2011
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Copyright (c) 2013-2018 Red Hat Inc.
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Authors:
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Anthony Liguori <aliguori@us.ibm.com>
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Michael Roth <mdroth@linux.vnet.ibm.com>
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Markus Armbruster <armbru@redhat.com>
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This work is licensed under the terms of the GNU GPL, version 2.
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# See the COPYING file in the top-level directory.
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"""
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from qapi.common import *
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from qapi.gen import QAPISchemaModularCVisitor, ifcontext
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from qapi.schema import QAPISchemaEnumMember, QAPISchemaObjectType
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# variants must be emitted before their container; track what has already
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# been output
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objects_seen = set()
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def gen_enum_lookup(name, members, prefix=None):
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ret = mcgen('''
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const QEnumLookup %(c_name)s_lookup = {
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.array = (const char *const[]) {
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''',
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c_name=c_name(name))
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for m in members:
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ret += gen_if(m.ifcond)
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index = c_enum_const(name, m.name, prefix)
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ret += mcgen('''
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[%(index)s] = "%(name)s",
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''',
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index=index, name=m.name)
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ret += gen_endif(m.ifcond)
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ret += mcgen('''
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},
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.size = %(max_index)s
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};
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''',
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max_index=c_enum_const(name, '_MAX', prefix))
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return ret
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def gen_enum(name, members, prefix=None):
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# append automatically generated _MAX value
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enum_members = members + [QAPISchemaEnumMember('_MAX', None)]
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ret = mcgen('''
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typedef enum %(c_name)s {
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''',
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c_name=c_name(name))
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for m in enum_members:
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ret += gen_if(m.ifcond)
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ret += mcgen('''
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%(c_enum)s,
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''',
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c_enum=c_enum_const(name, m.name, prefix))
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ret += gen_endif(m.ifcond)
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ret += mcgen('''
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} %(c_name)s;
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''',
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c_name=c_name(name))
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ret += mcgen('''
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#define %(c_name)s_str(val) \\
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qapi_enum_lookup(&%(c_name)s_lookup, (val))
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extern const QEnumLookup %(c_name)s_lookup;
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''',
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c_name=c_name(name))
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return ret
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def gen_fwd_object_or_array(name):
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return mcgen('''
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typedef struct %(c_name)s %(c_name)s;
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''',
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c_name=c_name(name))
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def gen_array(name, element_type):
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return mcgen('''
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struct %(c_name)s {
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%(c_name)s *next;
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%(c_type)s value;
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};
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''',
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c_name=c_name(name), c_type=element_type.c_type())
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def gen_struct_members(members):
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ret = ''
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for memb in members:
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ret += gen_if(memb.ifcond)
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if memb.optional:
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ret += mcgen('''
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bool has_%(c_name)s;
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''',
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c_name=c_name(memb.name))
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ret += mcgen('''
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%(c_type)s %(c_name)s;
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''',
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c_type=memb.type.c_type(), c_name=c_name(memb.name))
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ret += gen_endif(memb.ifcond)
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return ret
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def gen_object(name, ifcond, base, members, variants):
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if name in objects_seen:
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return ''
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objects_seen.add(name)
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ret = ''
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if variants:
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for v in variants.variants:
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if isinstance(v.type, QAPISchemaObjectType):
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ret += gen_object(v.type.name, v.type.ifcond, v.type.base,
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v.type.local_members, v.type.variants)
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ret += mcgen('''
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''')
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ret += gen_if(ifcond)
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ret += mcgen('''
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struct %(c_name)s {
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''',
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c_name=c_name(name))
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if base:
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if not base.is_implicit():
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ret += mcgen('''
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/* Members inherited from %(c_name)s: */
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''',
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c_name=base.c_name())
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ret += gen_struct_members(base.members)
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if not base.is_implicit():
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ret += mcgen('''
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/* Own members: */
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''')
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ret += gen_struct_members(members)
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if variants:
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ret += gen_variants(variants)
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# Make sure that all structs have at least one member; this avoids
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# potential issues with attempting to malloc space for zero-length
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# structs in C, and also incompatibility with C++ (where an empty
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# struct is size 1).
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if (not base or base.is_empty()) and not members and not variants:
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ret += mcgen('''
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char qapi_dummy_for_empty_struct;
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''')
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ret += mcgen('''
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};
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''')
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ret += gen_endif(ifcond)
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return ret
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def gen_upcast(name, base):
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# C makes const-correctness ugly. We have to cast away const to let
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# this function work for both const and non-const obj.
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return mcgen('''
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static inline %(base)s *qapi_%(c_name)s_base(const %(c_name)s *obj)
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{
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return (%(base)s *)obj;
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}
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''',
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c_name=c_name(name), base=base.c_name())
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def gen_variants(variants):
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ret = mcgen('''
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union { /* union tag is @%(c_name)s */
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''',
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c_name=c_name(variants.tag_member.name))
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for var in variants.variants:
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if var.type.name == 'q_empty':
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continue
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ret += gen_if(var.ifcond)
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ret += mcgen('''
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%(c_type)s %(c_name)s;
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''',
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c_type=var.type.c_unboxed_type(),
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c_name=c_name(var.name))
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ret += gen_endif(var.ifcond)
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ret += mcgen('''
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} u;
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''')
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return ret
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def gen_type_cleanup_decl(name):
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ret = mcgen('''
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void qapi_free_%(c_name)s(%(c_name)s *obj);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(%(c_name)s, qapi_free_%(c_name)s)
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''',
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c_name=c_name(name))
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return ret
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def gen_type_cleanup(name):
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ret = mcgen('''
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void qapi_free_%(c_name)s(%(c_name)s *obj)
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{
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Visitor *v;
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if (!obj) {
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return;
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}
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v = qapi_dealloc_visitor_new();
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visit_type_%(c_name)s(v, NULL, &obj, NULL);
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visit_free(v);
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}
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''',
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c_name=c_name(name))
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return ret
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class QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor):
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def __init__(self, prefix):
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super().__init__(
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prefix, 'qapi-types', ' * Schema-defined QAPI types',
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' * Built-in QAPI types', __doc__)
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def _begin_system_module(self, name):
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self._genc.preamble_add(mcgen('''
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#include "qemu/osdep.h"
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#include "qapi/dealloc-visitor.h"
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#include "qapi/qapi-builtin-types.h"
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#include "qapi/qapi-builtin-visit.h"
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'''))
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self._genh.preamble_add(mcgen('''
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#include "qapi/util.h"
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'''))
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def _begin_user_module(self, name):
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types = self._module_basename('qapi-types', name)
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visit = self._module_basename('qapi-visit', name)
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self._genc.preamble_add(mcgen('''
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#include "qemu/osdep.h"
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#include "qapi/dealloc-visitor.h"
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#include "%(types)s.h"
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#include "%(visit)s.h"
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''',
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types=types, visit=visit))
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self._genh.preamble_add(mcgen('''
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#include "qapi/qapi-builtin-types.h"
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'''))
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def visit_begin(self, schema):
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# gen_object() is recursive, ensure it doesn't visit the empty type
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objects_seen.add(schema.the_empty_object_type.name)
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def _gen_type_cleanup(self, name):
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self._genh.add(gen_type_cleanup_decl(name))
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self._genc.add(gen_type_cleanup(name))
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def visit_enum_type(self, name, info, ifcond, features, members, prefix):
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with ifcontext(ifcond, self._genh, self._genc):
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self._genh.preamble_add(gen_enum(name, members, prefix))
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self._genc.add(gen_enum_lookup(name, members, prefix))
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def visit_array_type(self, name, info, ifcond, element_type):
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with ifcontext(ifcond, self._genh, self._genc):
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self._genh.preamble_add(gen_fwd_object_or_array(name))
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self._genh.add(gen_array(name, element_type))
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self._gen_type_cleanup(name)
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def visit_object_type(self, name, info, ifcond, features,
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base, members, variants):
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# Nothing to do for the special empty builtin
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if name == 'q_empty':
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return
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with ifcontext(ifcond, self._genh):
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self._genh.preamble_add(gen_fwd_object_or_array(name))
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self._genh.add(gen_object(name, ifcond, base, members, variants))
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with ifcontext(ifcond, self._genh, self._genc):
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if base and not base.is_implicit():
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self._genh.add(gen_upcast(name, base))
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# TODO Worth changing the visitor signature, so we could
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# directly use rather than repeat type.is_implicit()?
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if not name.startswith('q_'):
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# implicit types won't be directly allocated/freed
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self._gen_type_cleanup(name)
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def visit_alternate_type(self, name, info, ifcond, features, variants):
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with ifcontext(ifcond, self._genh):
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self._genh.preamble_add(gen_fwd_object_or_array(name))
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self._genh.add(gen_object(name, ifcond, None,
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[variants.tag_member], variants))
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with ifcontext(ifcond, self._genh, self._genc):
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self._gen_type_cleanup(name)
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def gen_types(schema, output_dir, prefix, opt_builtins):
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vis = QAPISchemaGenTypeVisitor(prefix)
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schema.visit(vis)
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vis.write(output_dir, opt_builtins)
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