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68 lines
2.2 KiB
68 lines
2.2 KiB
/*
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* Copyright (C) 2021 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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#define LOG_TAG "DynamicCLDeps"
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#include "DynamicCLDeps.h"
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#include <android-base/logging.h>
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#include <dlfcn.h>
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namespace android::nn {
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namespace {
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void* loadFunction(void* handle, const char* name) {
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CHECK(handle != nullptr);
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void* fn = dlsym(handle, name);
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CHECK(fn != nullptr) << "Unable to open function " << name << ": " << dlerror();
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return fn;
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}
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#define NN_LOAD_FUNCTION(name, symbol) \
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impl.name = reinterpret_cast<decltype(impl.name)>(loadFunction(handle, #symbol));
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const CompatibilityLayerMemory loadCompatibilityLayerMemoryHelper() {
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CompatibilityLayerMemory impl = {};
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// libandroid.so is NOT accessible for non-NDK apps and
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// libcutils.so is NOT accessible for NDK apps.
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// Hence we try to load one or the other in order to cover both cases.
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void* handle = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
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if (handle != nullptr) {
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NN_LOAD_FUNCTION(create, ASharedMemory_create);
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NN_LOAD_FUNCTION(getSize, ASharedMemory_getSize);
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} else {
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handle = dlopen("libcutils.so", RTLD_LAZY | RTLD_LOCAL);
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CHECK(handle != nullptr) << "Unable to open either libandroid.so or libcutils.so: "
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<< dlerror();
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NN_LOAD_FUNCTION(create, ashmem_create_region);
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NN_LOAD_FUNCTION(getSize, ashmem_get_size_region);
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}
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return impl;
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}
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#undef NN_LOAD_FUNCTION
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} // namespace
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const CompatibilityLayerMemory& loadCompatibilityLayerMemory() {
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static const CompatibilityLayerMemory impl = loadCompatibilityLayerMemoryHelper();
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return impl;
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}
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} // namespace android::nn
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