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# Copyright 2023 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Validate mojo runtime feature guarded interfaces are nullable."""
import mojom.generate.check as check
import mojom.generate.module as module
class Check(check.Check):
def __init__(self, *args, **kwargs):
super(Check, self).__init__(*args, **kwargs)
# `param` is an Interface of some sort.
def _CheckNonNullableFeatureGuardedInterface(self, kind):
# Only need to validate interface if it has a RuntimeFeature
if not kind.kind.runtime_feature:
return
# Nullable (optional) is ok as the interface expects they might not be sent.
if kind.is_nullable:
return
interface = kind.kind.mojom_name
raise check.CheckException(
self.module,
f"interface {interface} has a RuntimeFeature but is not nullable")
# `param` can be a lot of things so check if it is a remote/receiver.
# Array/Map must be recursed into.
def _CheckFieldOrParam(self, kind):
if module.IsAnyInterfaceKind(kind):
self._CheckNonNullableFeatureGuardedInterface(kind)
if module.IsArrayKind(kind):
self._CheckFieldOrParam(kind.kind)
if module.IsMapKind(kind):
self._CheckFieldOrParam(kind.key_kind)
self._CheckFieldOrParam(kind.value_kind)
def _CheckInterfaceFeatures(self, interface):
for method in interface.methods:
for param in method.parameters:
self._CheckFieldOrParam(param.kind)
if method.response_parameters:
for param in method.response_parameters:
self._CheckFieldOrParam(param.kind)
def _CheckStructFeatures(self, struct):
for field in struct.fields:
self._CheckFieldOrParam(field.kind)
def _CheckUnionFeatures(self, union):
for field in union.fields:
self._CheckFieldOrParam(field.kind)
def CheckModule(self):
"""Validate that any runtime feature guarded interfaces that might be passed
over mojo are nullable."""
for interface in self.module.interfaces:
self._CheckInterfaceFeatures(interface)
for struct in self.module.structs:
self._CheckStructFeatures(struct)
for union in self.module.unions:
self._CheckUnionFeatures(union)
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