C types and JSON objects don't have fields, but members. We shouldn't gratuitously invent terminology. This patch is a strict renaming of static genarated functions, plus the naming of the dummy filler member for empty structs, before the next patch exposes some of that naming to the rest of the code base. Suggested-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1457021813-10704-3-git-send-email-eblake@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
316 lines
8.6 KiB
Python
316 lines
8.6 KiB
Python
#
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# QAPI types generator
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#
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# Copyright IBM, Corp. 2011
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# Copyright (c) 2013-2016 Red Hat Inc.
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#
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# Authors:
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# Anthony Liguori <aliguori@us.ibm.com>
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# Markus Armbruster <armbru@redhat.com>
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#
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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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from qapi import *
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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_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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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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return ret
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def gen_object(name, 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) and
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not v.type.is_implicit()):
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ret += gen_object(v.type.name, v.type.base,
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v.type.local_members, v.type.variants)
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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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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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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 and base.members) 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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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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# FIXME: What purpose does data serve, besides preventing a union that
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# has a branch named 'data'? We use it in qapi-visit.py to decide
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# whether to bypass the switch statement if visiting the discriminator
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# failed; but since we 0-initialize structs, and cannot tell what
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# branch of the union is in use if the discriminator is invalid, there
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# should not be any data leaks even without a data pointer. Or, if
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# 'data' is merely added to guarantee we don't have an empty union,
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# shouldn't we enforce that at .json parse time?
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ret = mcgen('''
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union { /* union tag is @%(c_name)s */
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void *data;
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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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# Ugly special case for simple union TODO get rid of it
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simple_union_type = var.simple_union_type()
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typ = simple_union_type or var.type
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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=typ.c_type(is_unboxed=not simple_union_type),
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c_name=c_name(var.name))
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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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''',
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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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QapiDeallocVisitor *qdv;
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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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qdv = qapi_dealloc_visitor_new();
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v = qapi_dealloc_get_visitor(qdv);
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visit_type_%(c_name)s(v, NULL, &obj, NULL);
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qapi_dealloc_visitor_cleanup(qdv);
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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(QAPISchemaVisitor):
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def __init__(self):
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self.decl = None
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self.defn = None
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self._fwdecl = None
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self._btin = None
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def visit_begin(self, schema):
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self.decl = ''
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self.defn = ''
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self._fwdecl = ''
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self._btin = guardstart('QAPI_TYPES_BUILTIN')
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def visit_end(self):
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self.decl = self._fwdecl + self.decl
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self._fwdecl = None
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# To avoid header dependency hell, we always generate
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# declarations for built-in types in our header files and
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# simply guard them. See also do_builtins (command line
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# option -b).
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self._btin += guardend('QAPI_TYPES_BUILTIN')
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self.decl = self._btin + self.decl
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self._btin = None
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def visit_needed(self, entity):
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# Visit everything except implicit objects
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return not (entity.is_implicit() and
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isinstance(entity, QAPISchemaObjectType))
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def _gen_type_cleanup(self, name):
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self.decl += gen_type_cleanup_decl(name)
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self.defn += gen_type_cleanup(name)
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def visit_enum_type(self, name, info, values, prefix):
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# Special case for our lone builtin enum type
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# TODO use something cleaner than existence of info
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if not info:
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self._btin += gen_enum(name, values, prefix)
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if do_builtins:
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self.defn += gen_enum_lookup(name, values, prefix)
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else:
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self._fwdecl += gen_enum(name, values, prefix)
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self.defn += gen_enum_lookup(name, values, prefix)
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def visit_array_type(self, name, info, element_type):
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if isinstance(element_type, QAPISchemaBuiltinType):
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self._btin += gen_fwd_object_or_array(name)
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self._btin += gen_array(name, element_type)
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self._btin += gen_type_cleanup_decl(name)
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if do_builtins:
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self.defn += gen_type_cleanup(name)
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else:
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self._fwdecl += gen_fwd_object_or_array(name)
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self.decl += 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, base, members, variants):
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self._fwdecl += gen_fwd_object_or_array(name)
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self.decl += gen_object(name, base, members, variants)
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if base:
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self.decl += gen_upcast(name, base)
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self._gen_type_cleanup(name)
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def visit_alternate_type(self, name, info, variants):
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self._fwdecl += gen_fwd_object_or_array(name)
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self.decl += gen_object(name, None, [variants.tag_member], variants)
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self._gen_type_cleanup(name)
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# If you link code generated from multiple schemata, you want only one
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# instance of the code for built-in types. Generate it only when
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# do_builtins, enabled by command line option -b. See also
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# QAPISchemaGenTypeVisitor.visit_end().
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do_builtins = False
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(input_file, output_dir, do_c, do_h, prefix, opts) = \
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parse_command_line("b", ["builtins"])
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for o, a in opts:
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if o in ("-b", "--builtins"):
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do_builtins = True
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c_comment = '''
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/*
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* deallocation functions for schema-defined QAPI types
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*
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* Copyright IBM, Corp. 2011
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*
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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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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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'''
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h_comment = '''
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/*
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* schema-defined QAPI types
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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'''
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(fdef, fdecl) = open_output(output_dir, do_c, do_h, prefix,
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'qapi-types.c', 'qapi-types.h',
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c_comment, h_comment)
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fdef.write(mcgen('''
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#include "qemu/osdep.h"
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#include "qapi/dealloc-visitor.h"
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#include "%(prefix)sqapi-types.h"
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#include "%(prefix)sqapi-visit.h"
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''',
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prefix=prefix))
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# To avoid circular headers, use only typedefs.h here, not qobject.h
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fdecl.write(mcgen('''
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#include "qemu/typedefs.h"
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'''))
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schema = QAPISchema(input_file)
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gen = QAPISchemaGenTypeVisitor()
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schema.visit(gen)
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fdef.write(gen.defn)
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fdecl.write(gen.decl)
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close_output(fdef, fdecl)
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