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* Copyright (C) 2017 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <hidl/HidlPassthroughSupport.h>
#include "InternalStatic.h" // TODO(b/69122224): remove this include, for tryWrap
#include <hidl/HidlTransportUtils.h>
#include <hidl/Static.h>
using ::android::hidl::base::V1_0::IBase;
namespace android {
namespace hardware {
namespace details {
static sp<IBase> tryWrap(const std::string& descriptor, sp<IBase> iface) {
auto func = getBsConstructorMap().get(descriptor, nullptr);
if (!func) {
// TODO(b/69122224): remove this when prebuilts don't reference it
func = gBsConstructorMap->get(descriptor, nullptr);
if (func) {
return func(static_cast<void*>(iface.get()));
return nullptr;
sp<IBase> wrapPassthroughInternal(sp<IBase> iface) {
if (iface == nullptr || iface->isRemote()) {
// doesn't know how to handle it.
return iface;
// Consider the case when an AOSP interface is extended by partners.
// Then the partner's HAL interface library is loaded only in the vndk
// linker namespace, but not in the default linker namespace, where
// this code runs. As a result, BsConstructorMap in the latter does not
// have the entry for the descriptor name.
// Therefore, we try to wrap using the descript names of the parent
// types along the interface chain, instead of always using the descriptor
// name of the current interface.
sp<IBase> base;
auto ret = iface->interfaceChain([&](const auto& types) {
for (const std::string& descriptor : types) {
base = tryWrap(descriptor, iface);
if (base != nullptr) {
break; // wrap is successful. no need to lookup further.
if (!ret.isOk()) {
return nullptr;
// It is ensured that if this function is called with an instance of IType
// then the corresponding descriptor would be in the BsConstructorMap.
// This is because referencing IType implies that the interface library
// defining the type has already been loaded into the current linker
// namespace, and thus the library should have added an entry into the
// BsConstructorMap while executing the library's constructor.
return base;
} // namespace details
} // namespace hardware
} // namespace android