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# Copyright 2022 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Validate RequireContext and AllowedContext annotations before generation."""
import mojom.generate.check as check
import mojom.generate.module as module
class Check(check.Check):
def __init__(self, *args, **kwargs):
self.kind_to_interfaces = dict()
super(Check, self).__init__(*args, **kwargs)
def _IsPassedInterface(self, candidate):
if isinstance(
candidate.kind,
(module.PendingReceiver, module.PendingRemote,
module.PendingAssociatedReceiver, module.PendingAssociatedRemote)):
return True
return False
def _CheckInterface(self, method, param):
# |param| is a pending_x<Interface> so need .kind.kind to get Interface.
interface = param.kind.kind
if interface.require_context:
if method.allowed_context is None:
raise check.CheckException(
self.module, "method `{}` has parameter `{}` which passes interface"
" `{}` that requires an AllowedContext annotation but none exists.".
format(
method.mojom_name,
param.mojom_name,
interface.mojom_name,
))
# If a string was provided, or if an enum was not imported, this will
# be a string and we cannot validate that it is in range.
if not isinstance(method.allowed_context, module.EnumValue):
raise check.CheckException(
self.module,
"method `{}` has AllowedContext={} which is not a valid enum value."
.format(method.mojom_name, method.allowed_context))
# EnumValue must be from the same enum to be compared.
if interface.require_context.enum != method.allowed_context.enum:
raise check.CheckException(
self.module, "method `{}` has parameter `{}` which passes interface"
" `{}` that requires AllowedContext={} but one of kind `{}` was "
"provided.".format(
method.mojom_name,
param.mojom_name,
interface.mojom_name,
interface.require_context.enum,
method.allowed_context.enum,
))
# RestrictContext enums have most privileged field first (lowest value).
interface_value = interface.require_context.field.numeric_value
method_value = method.allowed_context.field.numeric_value
if interface_value < method_value:
raise check.CheckException(
self.module, "RequireContext={} > AllowedContext={} for method "
"`{}` which passes interface `{}`.".format(
interface.require_context.GetSpec(),
method.allowed_context.GetSpec(), method.mojom_name,
interface.mojom_name))
return True
def _GatherReferencedInterfaces(self, field):
key = field.kind.spec
# structs/unions can nest themselves so we need to bookkeep.
if not key in self.kind_to_interfaces:
# Might reference ourselves so have to create the list first.
self.kind_to_interfaces[key] = set()
for param in field.kind.fields:
if self._IsPassedInterface(param):
self.kind_to_interfaces[key].add(param)
elif isinstance(param.kind, (module.Struct, module.Union)):
for iface in self._GatherReferencedInterfaces(param):
self.kind_to_interfaces[key].add(iface)
return self.kind_to_interfaces[key]
def _CheckParams(self, method, params):
# Note: we have to repeat _CheckParams for each method as each might have
# different AllowedContext= attributes. We cannot memoize this function,
# but can do so for gathering referenced interfaces as their RequireContext
# attributes do not change.
for param in params:
if self._IsPassedInterface(param):
self._CheckInterface(method, param)
elif isinstance(param.kind, (module.Struct, module.Union)):
for interface in self._GatherReferencedInterfaces(param):
self._CheckInterface(method, interface)
def _CheckMethod(self, method):
if method.parameters:
self._CheckParams(method, method.parameters)
if method.response_parameters:
self._CheckParams(method, method.response_parameters)
def CheckModule(self):
for interface in self.module.interfaces:
for method in interface.methods:
self._CheckMethod(method)
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