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83 lines
2.9 KiB
83 lines
2.9 KiB
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <hidl/HidlPassthroughSupport.h>
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#include "InternalStatic.h" // TODO(b/69122224): remove this include, for tryWrap
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#include <hidl/HidlTransportUtils.h>
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#include <hidl/Static.h>
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using ::android::hidl::base::V1_0::IBase;
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namespace android {
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namespace hardware {
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namespace details {
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static sp<IBase> tryWrap(const std::string& descriptor, sp<IBase> iface) {
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auto func = getBsConstructorMap().get(descriptor, nullptr);
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if (!func) {
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// TODO(b/69122224): remove this when prebuilts don't reference it
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func = gBsConstructorMap->get(descriptor, nullptr);
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}
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if (func) {
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return func(static_cast<void*>(iface.get()));
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}
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return nullptr;
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}
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sp<IBase> wrapPassthroughInternal(sp<IBase> iface) {
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if (iface == nullptr || iface->isRemote()) {
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// doesn't know how to handle it.
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return iface;
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}
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// Consider the case when an AOSP interface is extended by partners.
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// Then the partner's HAL interface library is loaded only in the vndk
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// linker namespace, but not in the default linker namespace, where
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// this code runs. As a result, BsConstructorMap in the latter does not
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// have the entry for the descriptor name.
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//
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// Therefore, we try to wrap using the descript names of the parent
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// types along the interface chain, instead of always using the descriptor
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// name of the current interface.
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sp<IBase> base;
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auto ret = iface->interfaceChain([&](const auto& types) {
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for (const std::string& descriptor : types) {
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base = tryWrap(descriptor, iface);
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if (base != nullptr) {
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break; // wrap is successful. no need to lookup further.
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}
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}
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});
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if (!ret.isOk()) {
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return nullptr;
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}
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// It is ensured that if this function is called with an instance of IType
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// then the corresponding descriptor would be in the BsConstructorMap.
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// This is because referencing IType implies that the interface library
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// defining the type has already been loaded into the current linker
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// namespace, and thus the library should have added an entry into the
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// BsConstructorMap while executing the library's constructor.
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return base;
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}
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} // namespace details
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} // namespace hardware
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} // namespace android
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