""" QAPI types generator Copyright IBM, Corp. 2011 Copyright (c) 2013-2018 Red Hat Inc. Authors: Anthony Liguori Michael Roth Markus Armbruster This work is licensed under the terms of the GNU GPL, version 2. # See the COPYING file in the top-level directory. """ from qapi.common import * # variants must be emitted before their container; track what has already # been output objects_seen = set() def gen_fwd_object_or_array(name): return mcgen(''' typedef struct %(c_name)s %(c_name)s; ''', c_name=c_name(name)) def gen_array(name, element_type): return mcgen(''' struct %(c_name)s { %(c_name)s *next; %(c_type)s value; }; ''', c_name=c_name(name), c_type=element_type.c_type()) def gen_struct_members(members): ret = '' for memb in members: ret += gen_if(memb.ifcond) if memb.optional: ret += mcgen(''' bool has_%(c_name)s; ''', c_name=c_name(memb.name)) ret += mcgen(''' %(c_type)s %(c_name)s; ''', c_type=memb.type.c_type(), c_name=c_name(memb.name)) ret += gen_endif(memb.ifcond) return ret def gen_object(name, ifcond, base, members, variants): if name in objects_seen: return '' objects_seen.add(name) ret = '' if variants: for v in variants.variants: if isinstance(v.type, QAPISchemaObjectType): ret += gen_object(v.type.name, v.type.ifcond, v.type.base, v.type.local_members, v.type.variants) ret += mcgen(''' ''') ret += gen_if(ifcond) ret += mcgen(''' struct %(c_name)s { ''', c_name=c_name(name)) if base: if not base.is_implicit(): ret += mcgen(''' /* Members inherited from %(c_name)s: */ ''', c_name=base.c_name()) ret += gen_struct_members(base.members) if not base.is_implicit(): ret += mcgen(''' /* Own members: */ ''') ret += gen_struct_members(members) if variants: ret += gen_variants(variants) # Make sure that all structs have at least one member; this avoids # potential issues with attempting to malloc space for zero-length # structs in C, and also incompatibility with C++ (where an empty # struct is size 1). if (not base or base.is_empty()) and not members and not variants: ret += mcgen(''' char qapi_dummy_for_empty_struct; ''') ret += mcgen(''' }; ''') ret += gen_endif(ifcond) return ret def gen_upcast(name, base): # C makes const-correctness ugly. We have to cast away const to let # this function work for both const and non-const obj. return mcgen(''' static inline %(base)s *qapi_%(c_name)s_base(const %(c_name)s *obj) { return (%(base)s *)obj; } ''', c_name=c_name(name), base=base.c_name()) def gen_variants(variants): ret = mcgen(''' union { /* union tag is @%(c_name)s */ ''', c_name=c_name(variants.tag_member.name)) for var in variants.variants: if var.type.name == 'q_empty': continue ret += gen_if(var.ifcond) ret += mcgen(''' %(c_type)s %(c_name)s; ''', c_type=var.type.c_unboxed_type(), c_name=c_name(var.name)) ret += gen_endif(var.ifcond) ret += mcgen(''' } u; ''') return ret def gen_type_cleanup_decl(name): ret = mcgen(''' void qapi_free_%(c_name)s(%(c_name)s *obj); ''', c_name=c_name(name)) return ret def gen_type_cleanup(name): ret = mcgen(''' void qapi_free_%(c_name)s(%(c_name)s *obj) { Visitor *v; if (!obj) { return; } v = qapi_dealloc_visitor_new(); visit_type_%(c_name)s(v, NULL, &obj, NULL); visit_free(v); } ''', c_name=c_name(name)) return ret class QAPISchemaGenTypeVisitor(QAPISchemaModularCVisitor): def __init__(self, prefix): QAPISchemaModularCVisitor.__init__( self, prefix, 'qapi-types', ' * Schema-defined QAPI types', __doc__) self._add_system_module(None, ' * Built-in QAPI types') self._genc.preamble_add(mcgen(''' #include "qemu/osdep.h" #include "qapi/dealloc-visitor.h" #include "qapi/qapi-builtin-types.h" #include "qapi/qapi-builtin-visit.h" ''')) self._genh.preamble_add(mcgen(''' #include "qapi/util.h" ''')) def _begin_user_module(self, name): types = self._module_basename('qapi-types', name) visit = self._module_basename('qapi-visit', name) self._genc.preamble_add(mcgen(''' #include "qemu/osdep.h" #include "qapi/dealloc-visitor.h" #include "%(types)s.h" #include "%(visit)s.h" ''', types=types, visit=visit)) self._genh.preamble_add(mcgen(''' #include "qapi/qapi-builtin-types.h" ''')) def visit_begin(self, schema): # gen_object() is recursive, ensure it doesn't visit the empty type objects_seen.add(schema.the_empty_object_type.name) def _gen_type_cleanup(self, name): self._genh.add(gen_type_cleanup_decl(name)) self._genc.add(gen_type_cleanup(name)) def visit_enum_type(self, name, info, ifcond, members, prefix): with ifcontext(ifcond, self._genh, self._genc): self._genh.preamble_add(gen_enum(name, members, prefix)) self._genc.add(gen_enum_lookup(name, members, prefix)) def visit_array_type(self, name, info, ifcond, element_type): with ifcontext(ifcond, self._genh, self._genc): self._genh.preamble_add(gen_fwd_object_or_array(name)) self._genh.add(gen_array(name, element_type)) self._gen_type_cleanup(name) def visit_object_type(self, name, info, ifcond, base, members, variants, features): # Nothing to do for the special empty builtin if name == 'q_empty': return with ifcontext(ifcond, self._genh): self._genh.preamble_add(gen_fwd_object_or_array(name)) self._genh.add(gen_object(name, ifcond, base, members, variants)) with ifcontext(ifcond, self._genh, self._genc): if base and not base.is_implicit(): self._genh.add(gen_upcast(name, base)) # TODO Worth changing the visitor signature, so we could # directly use rather than repeat type.is_implicit()? if not name.startswith('q_'): # implicit types won't be directly allocated/freed self._gen_type_cleanup(name) def visit_alternate_type(self, name, info, ifcond, variants): with ifcontext(ifcond, self._genh): self._genh.preamble_add(gen_fwd_object_or_array(name)) self._genh.add(gen_object(name, ifcond, None, [variants.tag_member], variants)) with ifcontext(ifcond, self._genh, self._genc): self._gen_type_cleanup(name) def gen_types(schema, output_dir, prefix, opt_builtins): vis = QAPISchemaGenTypeVisitor(prefix) schema.visit(vis) vis.write(output_dir, opt_builtins)