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Fri, 10 Oct 2025 08:10:43 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHzA8t1uomIKaixAqDtUL/CYFXN/e0VnSTUUNA3/03C1Pr3W1AeWXJOgW2ERfTTqkFLfGj75Q== X-Received: by 2002:a17:906:ee85:b0:b4e:f7cc:6346 with SMTP id a640c23a62f3a-b50aa08f852mr1145090266b.15.1760109043261; Fri, 10 Oct 2025 08:10:43 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: armbru@redhat.com, marcandre.lureau@redhat.com, qemu-rust@nongnu.org Subject: [PATCH 14/19] scripts/qapi: generate high-level Rust bindings Date: Fri, 10 Oct 2025 17:09:59 +0200 Message-ID: <20251010151006.791038-15-pbonzini@redhat.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251010151006.791038-1-pbonzini@redhat.com> References: <20251010151006.791038-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.441, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1760109375493158500 From: Marc-Andr=C3=A9 Lureau Generate high-level native Rust declarations for the QAPI types. - char* is mapped to String, scalars to there corresponding Rust types - enums are simply aliased from FFI - has_foo/foo members are mapped to Option - lists are represented as Vec - structures have Rust versions, with To/From FFI conversions - alternate are represented as Rust enum - unions are represented in a similar way as in C: a struct S with a "u" member (since S may have extra 'base' fields). However, the discriminant isn't a member of S, since Rust enum already include it. Signed-off-by: Marc-Andr=C3=A9 Lureau Link: https://lore.kernel.org/r/20210907121943.3498701-21-marcandre.lureau@= redhat.com Signed-off-by: Paolo Bonzini --- meson.build | 4 +- scripts/qapi/backend.py | 27 ++- scripts/qapi/main.py | 4 +- scripts/qapi/rs.py | 181 +++++++++++++++++++ scripts/qapi/rs_types.py | 365 +++++++++++++++++++++++++++++++++++++++ 5 files changed, 577 insertions(+), 4 deletions(-) create mode 100644 scripts/qapi/rs.py create mode 100644 scripts/qapi/rs_types.py diff --git a/meson.build b/meson.build index afaefa01722..ce914217c52 100644 --- a/meson.build +++ b/meson.build @@ -3571,12 +3571,14 @@ qapi_gen_depends =3D [ meson.current_source_dir() /= 'scripts/qapi/__init__.py', meson.current_source_dir() / 'scripts/qapi/introspect= .py', meson.current_source_dir() / 'scripts/qapi/main.py', meson.current_source_dir() / 'scripts/qapi/parser.py', + meson.current_source_dir() / 'scripts/qapi/rs_types.p= y', meson.current_source_dir() / 'scripts/qapi/schema.py', meson.current_source_dir() / 'scripts/qapi/source.py', meson.current_source_dir() / 'scripts/qapi/types.py', meson.current_source_dir() / 'scripts/qapi/features.p= y', meson.current_source_dir() / 'scripts/qapi/visit.py', - meson.current_source_dir() / 'scripts/qapi-gen.py' + meson.current_source_dir() / 'scripts/qapi-gen.py', + meson.current_source_dir() / 'scripts/qapi/rs.py', ] =20 tracetool =3D [ diff --git a/scripts/qapi/backend.py b/scripts/qapi/backend.py index 49ae6ecdd33..305b62b514c 100644 --- a/scripts/qapi/backend.py +++ b/scripts/qapi/backend.py @@ -7,6 +7,7 @@ from .events import gen_events from .features import gen_features from .introspect import gen_introspect +from .rs_types import gen_rs_types from .schema import QAPISchema from .types import gen_types from .visit import gen_visit @@ -36,7 +37,7 @@ def generate(self, """ =20 =20 -class QAPICBackend(QAPIBackend): +class QAPICodeBackend(QAPIBackend): # pylint: disable=3Dtoo-few-public-methods =20 def generate(self, @@ -63,3 +64,27 @@ def generate(self, gen_commands(schema, output_dir, prefix, gen_tracing) gen_events(schema, output_dir, prefix) gen_introspect(schema, output_dir, prefix, unmask) + + +class QAPIRsBackend(QAPIBackend): + # pylint: disable=3Dtoo-few-public-methods + + def generate(self, + schema: QAPISchema, + output_dir: str, + prefix: str, + unmask: bool, + builtins: bool, + gen_tracing: bool) -> None: + """ + Generate Rust code for the given schema into the target directory. + + :param schema_file: The primary QAPI schema file. + :param output_dir: The output directory to store generated code. + :param prefix: Optional C-code prefix for symbol names. + :param unmask: Expose non-ABI names through introspection? + :param builtins: Generate code for built-in types? + + :raise QAPIError: On failures. + """ + gen_rs_types(schema, output_dir, prefix, builtins) diff --git a/scripts/qapi/main.py b/scripts/qapi/main.py index 0e2a6ae3f07..4ad75e213f5 100644 --- a/scripts/qapi/main.py +++ b/scripts/qapi/main.py @@ -12,7 +12,7 @@ import sys from typing import Optional =20 -from .backend import QAPIBackend, QAPICBackend +from .backend import QAPIBackend, QAPICodeBackend from .common import must_match from .error import QAPIError from .schema import QAPISchema @@ -27,7 +27,7 @@ def invalid_prefix_char(prefix: str) -> Optional[str]: =20 def create_backend(path: str) -> QAPIBackend: if path is None: - return QAPICBackend() + return QAPICodeBackend() =20 module_path, dot, class_name =3D path.rpartition('.') if not dot: diff --git a/scripts/qapi/rs.py b/scripts/qapi/rs.py new file mode 100644 index 00000000000..2a9bbcb9f54 --- /dev/null +++ b/scripts/qapi/rs.py @@ -0,0 +1,181 @@ +# This work is licensed under the terms of the GNU GPL, version 2. +# See the COPYING file in the top-level directory. +""" +QAPI Rust generator +""" + +import os +import re +import subprocess +from typing import NamedTuple, Optional + +from .common import POINTER_SUFFIX +from .gen import QAPIGen +from .schema import QAPISchemaModule, QAPISchemaVisitor + + +# see to_upper_case()/to_lower_case() below +snake_case =3D re.compile(r'((?<=3D[a-z0-9])[A-Z]|(?!^)[A-Z](?=3D[a-z]))') + + +rs_name_trans =3D str.maketrans('.-', '__') + + +# Map @name to a valid Rust identifier. +# If @protect, avoid returning certain ticklish identifiers (like +# keywords) by prepending raw identifier prefix 'r#'. +def rs_name(name: str, protect: bool =3D True) -> str: + name =3D name.translate(rs_name_trans) + if name[0].isnumeric(): + name =3D '_' + name + if not protect: + return name + # based from the list: + # https://doc.rust-lang.org/reference/keywords.html + if name in ('Self', 'abstract', 'as', 'async', + 'await', 'become', 'box', 'break', + 'const', 'continue', 'crate', 'do', + 'dyn', 'else', 'enum', 'extern', + 'false', 'final', 'fn', 'for', + 'if', 'impl', 'in', 'let', + 'loop', 'macro', 'match', 'mod', + 'move', 'mut', 'override', 'priv', + 'pub', 'ref', 'return', 'self', + 'static', 'struct', 'super', 'trait', + 'true', 'try', 'type', 'typeof', + 'union', 'unsafe', 'unsized', 'use', + 'virtual', 'where', 'while', 'yield'): + name =3D 'r#' + name + # avoid some clashes with the standard library + if name in ('String',): + name =3D 'Qapi' + name + + return name + + +def rs_type(c_type: str, + qapi_ns: str =3D 'qapi::', + optional: bool =3D False, + box: bool =3D False) -> str: + (is_pointer, _, is_list, c_type) =3D rs_ctype_parse(c_type) + to_rs =3D { + 'QNull': '()', + 'QObject': 'QObject', + 'any': 'QObject', + 'bool': 'bool', + 'char': 'i8', + 'double': 'f64', + 'int': 'i64', + 'int16': 'i16', + 'int16_t': 'i16', + 'int32': 'i32', + 'int32_t': 'i32', + 'int64': 'i64', + 'int64_t': 'i64', + 'int8': 'i8', + 'int8_t': 'i8', + 'number': 'f64', + 'size': 'u64', + 'str': 'String', + 'uint16': 'u16', + 'uint16_t': 'u16', + 'uint32': 'u32', + 'uint32_t': 'u32', + 'uint64': 'u64', + 'uint64_t': 'u64', + 'uint8': 'u8', + 'uint8_t': 'u8', + 'String': 'QapiString', + } + if is_pointer: + to_rs.update({ + 'char': 'String', + }) + + if is_list: + c_type =3D c_type[:-4] + + ret =3D to_rs.get(c_type, qapi_ns + c_type) + if is_list: + ret =3D 'Vec<%s>' % ret + elif is_pointer and c_type not in to_rs and box: + ret =3D 'Box<%s>' % ret + if optional: + ret =3D 'Option<%s>' % ret + return ret + + +class CType(NamedTuple): + is_pointer: bool + is_const: bool + is_list: bool + c_type: str + + +def rs_ctype_parse(c_type: str) -> CType: + is_pointer =3D False + if c_type.endswith(POINTER_SUFFIX): + is_pointer =3D True + c_type =3D c_type[:-len(POINTER_SUFFIX)] + is_list =3D c_type.endswith('List') + is_const =3D False + if c_type.startswith('const '): + is_const =3D True + c_type =3D c_type[6:] + + c_type =3D rs_name(c_type) + return CType(is_pointer, is_const, is_list, c_type) + + +def to_camel_case(value: str) -> str: + # special case for last enum value + if value =3D=3D '_MAX': + return value + raw_id =3D False + if value.startswith('r#'): + raw_id =3D True + value =3D value[2:] + value =3D ''.join('_' + word if word[0].isdigit() + else word[:1].upper() + word[1:] + for word in filter(None, re.split("[-_]+", value))) + if raw_id: + return 'r#' + value + return value + + +def to_upper_case(value: str) -> str: + return snake_case.sub(r'_\1', value).upper() + + +def to_lower_case(value: str) -> str: + return snake_case.sub(r'_\1', value).lower() + + +class QAPIGenRs(QAPIGen): + pass + + +class QAPISchemaRsVisitor(QAPISchemaVisitor): + + def __init__(self, prefix: str, what: str): + super().__init__() + self._prefix =3D prefix + self._what =3D what + self._gen =3D QAPIGenRs(self._prefix + self._what + '.rs') + self._main_module: Optional[str] =3D None + + def visit_module(self, name: Optional[str]) -> None: + if name is None: + return + if QAPISchemaModule.is_user_module(name): + if self._main_module is None: + self._main_module =3D name + + def write(self, output_dir: str) -> None: + self._gen.write(output_dir) + + pathname =3D os.path.join(output_dir, self._gen.fname) + try: + subprocess.check_call(['rustfmt', pathname]) + except FileNotFoundError: + pass diff --git a/scripts/qapi/rs_types.py b/scripts/qapi/rs_types.py new file mode 100644 index 00000000000..436adcf5be6 --- /dev/null +++ b/scripts/qapi/rs_types.py @@ -0,0 +1,365 @@ +# This work is licensed under the terms of the GNU GPL, version 2. +# See the COPYING file in the top-level directory. +""" +QAPI Rust types generator +""" + +from typing import List, Optional, Set + +from .common import mcgen +from .rs import ( + QAPISchemaRsVisitor, + rs_name, + rs_type, + to_camel_case, + to_lower_case, + to_upper_case, +) +from .schema import ( + QAPISchema, + QAPISchemaAlternateType, + QAPISchemaArrayType, + QAPISchemaEnumMember, + QAPISchemaFeature, + QAPISchemaIfCond, + QAPISchemaObjectType, + QAPISchemaObjectTypeMember, + QAPISchemaType, + QAPISchemaVariants, +) +from .source import QAPISourceInfo + + +objects_seen =3D set() + + +def gen_rs_variants_to_tag(name: str, + ifcond: QAPISchemaIfCond, + variants: QAPISchemaVariants) -> str: + ret =3D mcgen(''' + +%(cfg)s +impl From<&%(rs_name)sVariant> for %(tag)s { + fn from(e: &%(rs_name)sVariant) -> Self { + match e { + ''', + cfg=3Difcond.rsgen(), + rs_name=3Drs_name(name), + tag=3Drs_type(variants.tag_member.type.c_type(), '')) + + for var in variants.variants: + type_name =3D var.type.name + tag_name =3D var.name + patt =3D '(_)' + if type_name =3D=3D 'q_empty': + patt =3D '' + ret +=3D mcgen(''' + %(cfg)s + %(rs_name)sVariant::%(var_name)s%(patt)s =3D> Self::%(tag_name)s, +''', + cfg=3Dvar.ifcond.rsgen(), + rs_name=3Drs_name(name), + tag_name=3Drs_name(to_upper_case(tag_name)), + var_name=3Drs_name(to_camel_case(tag_name)), + patt=3Dpatt) + + ret +=3D mcgen(''' + } + } +} +''') + return ret + + +def gen_rs_variants(name: str, + ifcond: QAPISchemaIfCond, + variants: QAPISchemaVariants) -> str: + ret =3D mcgen(''' + +%(cfg)s +#[derive(Clone, Debug, PartialEq)] +pub enum %(rs_name)sVariant { +''', + cfg=3Difcond.rsgen(), + rs_name=3Drs_name(name)) + + for var in variants.variants: + type_name =3D var.type.name + var_name =3D rs_name(to_camel_case(var.name), False) + if type_name =3D=3D 'q_empty': + ret +=3D mcgen(''' + %(cfg)s + %(var_name)s, +''', + cfg=3Dvar.ifcond.rsgen(), + var_name=3Dvar_name) + else: + c_type =3D var.type.c_unboxed_type() + if c_type.endswith('_wrapper'): + c_type =3D c_type[6:-8] # remove q_obj*-wrapper + ret +=3D mcgen(''' + %(cfg)s + %(var_name)s(%(rs_type)s), +''', + cfg=3Dvar.ifcond.rsgen(), + var_name=3Dvar_name, + rs_type=3Drs_type(c_type, '')) + + ret +=3D mcgen(''' +} +''') + + ret +=3D gen_rs_variants_to_tag(name, ifcond, variants) + + return ret + + +def gen_rs_members(members: List[QAPISchemaObjectTypeMember], + exclude: Optional[List[str]] =3D None) -> List[str]: + exclude =3D exclude or [] + return [f"{m.ifcond.rsgen()} {rs_name(to_lower_case(m.name))}" + for m in members if m.name not in exclude] + + +def has_recursive_type(memb: QAPISchemaType, + name: str, + visited: Set[str]) -> bool: + # pylint: disable=3Dtoo-many-return-statements + if name =3D=3D memb.name: + return True + if memb.name in visited: + return False + visited.add(memb.name) + if isinstance(memb, QAPISchemaObjectType): + if memb.base and has_recursive_type(memb.base, name, visited): + return True + if memb.branches and \ + any(has_recursive_type(m.type, name, visited) + for m in memb.branches.variants): + return True + if any(has_recursive_type(m.type, name, visited) + for m in memb.members): + return True + return any(has_recursive_type(m.type, name, visited) + for m in memb.local_members) + if isinstance(memb, QAPISchemaAlternateType): + return any(has_recursive_type(m.type, name, visited) + for m in memb.alternatives.variants) + if isinstance(memb, QAPISchemaArrayType): + return has_recursive_type(memb.element_type, name, visited) + return False + + +def gen_struct_members(members: List[QAPISchemaObjectTypeMember], + name: str) -> str: + ret =3D '' + for memb in members: + is_recursive =3D has_recursive_type(memb.type, name, set()) + typ =3D rs_type(memb.type.c_type(), '', + optional=3Dmemb.optional, box=3Dis_recursive) + ret +=3D mcgen(''' + %(cfg)s + pub %(rs_name)s: %(rs_type)s, +''', + cfg=3Dmemb.ifcond.rsgen(), + rs_type=3Dtyp, + rs_name=3Drs_name(to_lower_case(memb.name))) + return ret + + +def gen_rs_object(name: str, + ifcond: QAPISchemaIfCond, + base: Optional[QAPISchemaObjectType], + members: List[QAPISchemaObjectTypeMember], + variants: Optional[QAPISchemaVariants]) -> str: + if name in objects_seen: + return '' + + if variants: + members =3D [m for m in members + if m.name !=3D variants.tag_member.name] + + ret =3D '' + objects_seen.add(name) + + if variants: + ret +=3D gen_rs_variants(name, ifcond, variants) + + ret +=3D mcgen(''' + +%(cfg)s +#[derive(Clone, Debug, PartialEq)] +pub struct %(rs_name)s { +''', + cfg=3Difcond.rsgen(), + rs_name=3Drs_name(name)) + + if base: + if not base.is_implicit(): + ret +=3D mcgen(''' + // Members inherited: +''', + c_name=3Dbase.c_name()) + base_members =3D base.members + if variants: + base_members =3D [m for m in base.members + if m.name !=3D variants.tag_member.name] + ret +=3D gen_struct_members(base_members, name) + if not base.is_implicit(): + ret +=3D mcgen(''' + // Own members: +''') + + ret +=3D gen_struct_members(members, name) + + if variants: + ret +=3D mcgen(''' + pub u: %(rs_type)sVariant, +''', rs_type=3Drs_name(name)) + ret +=3D mcgen(''' +} +''') + return ret + + +def gen_rs_enum(name: str, + ifcond: QAPISchemaIfCond, + members: List[QAPISchemaEnumMember]) -> str: + # append automatically generated _max value + enum_members =3D members + [QAPISchemaEnumMember('_MAX', None)] + + ret =3D mcgen(''' + +%(cfg)s +#[repr(u32)] +#[derive(Copy, Clone, Debug, PartialEq, common::TryInto)] +pub enum %(rs_name)s { +''', + cfg=3Difcond.rsgen(), + rs_name=3Drs_name(name)) + + for member in enum_members: + ret +=3D mcgen(''' + %(cfg)s + %(c_enum)s, +''', + cfg=3Dmember.ifcond.rsgen(), + c_enum=3Drs_name(to_upper_case(member.name))) + # picked the first, since that's what malloc0 does + default =3D rs_name(to_upper_case(enum_members[0].name)) + ret +=3D mcgen(''' +} + +%(cfg)s +impl Default for %(rs_name)s { + #[inline] + fn default() -> %(rs_name)s { + Self::%(default)s + } +} +''', + cfg=3Difcond.rsgen(), + rs_name=3Drs_name(name), + default=3Ddefault) + return ret + + +def gen_rs_alternate(name: str, + ifcond: QAPISchemaIfCond, + variants: QAPISchemaVariants) -> str: + if name in objects_seen: + return '' + + ret =3D '' + objects_seen.add(name) + + ret +=3D mcgen(''' +%(cfg)s +#[derive(Clone, Debug, PartialEq)] +pub enum %(rs_name)s { +''', + cfg=3Difcond.rsgen(), + rs_name=3Drs_name(name)) + + for var in variants.variants: + if var.type.name =3D=3D 'q_empty': + continue + is_recursive =3D has_recursive_type(var.type, name, set()) + ret +=3D mcgen(''' + %(cfg)s + %(mem_name)s(%(rs_type)s), +''', + cfg=3Dvar.ifcond.rsgen(), + rs_type=3Drs_type(var.type.c_unboxed_type(), '', + box=3Dis_recursive), + mem_name=3Drs_name(to_camel_case(var.name))) + + ret +=3D mcgen(''' +} +''') + return ret + + +class QAPISchemaGenRsTypeVisitor(QAPISchemaRsVisitor): + + def __init__(self, prefix: str) -> None: + super().__init__(prefix, 'qapi-types') + + def visit_begin(self, schema: QAPISchema) -> None: + # don't visit the empty type + objects_seen.add(schema.the_empty_object_type.name) + self._gen.preamble_add( + mcgen(''' +// @generated by qapi-gen, DO NOT EDIT + +#![allow(unexpected_cfgs)] +#![allow(non_camel_case_types)] +#![allow(clippy::empty_structs_with_brackets)] +#![allow(clippy::large_enum_variant)] +#![allow(clippy::pub_underscore_fields)] + +// Because QAPI structs can contain float, for simplicity we never +// derive Eq. Clippy however would complain for those structs +// that *could* be Eq too. +#![allow(clippy::derive_partial_eq_without_eq)] + +use util::qobject::QObject; +''')) + + def visit_object_type(self, + name: str, + info: Optional[QAPISourceInfo], + ifcond: QAPISchemaIfCond, + features: List[QAPISchemaFeature], + base: Optional[QAPISchemaObjectType], + members: List[QAPISchemaObjectTypeMember], + branches: Optional[QAPISchemaVariants]) -> None: + if name.startswith('q_'): + return + self._gen.add(gen_rs_object(name, ifcond, base, members, branches)) + + def visit_enum_type(self, + name: str, + info: Optional[QAPISourceInfo], + ifcond: QAPISchemaIfCond, + features: List[QAPISchemaFeature], + members: List[QAPISchemaEnumMember], + prefix: Optional[str]) -> None: + self._gen.add(gen_rs_enum(name, ifcond, members)) + + def visit_alternate_type(self, + name: str, + info: Optional[QAPISourceInfo], + ifcond: QAPISchemaIfCond, + features: List[QAPISchemaFeature], + alternatives: QAPISchemaVariants) -> None: + self._gen.add(gen_rs_alternate(name, ifcond, alternatives)) + + +def gen_rs_types(schema: QAPISchema, output_dir: str, prefix: str, + builtins: bool) -> None: + # pylint: disable=3Dunused-argument + # TODO: builtins? + vis =3D QAPISchemaGenRsTypeVisitor(prefix) + schema.visit(vis) + vis.write(output_dir) --=20 2.51.0