133 lines
4.1 KiB
C++
133 lines
4.1 KiB
C++
/*
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* Copyright (C) 2019 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 <binder/Stability.h>
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#include <binder/BpBinder.h>
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#include <binder/Binder.h>
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namespace android {
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namespace internal {
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void Stability::markCompilationUnit(IBinder* binder) {
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status_t result = set(binder, kLocalStability, true /*log*/);
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LOG_ALWAYS_FATAL_IF(result != OK, "Should only mark known object.");
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}
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void Stability::markVintf(IBinder* binder) {
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status_t result = set(binder, Level::VINTF, true /*log*/);
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LOG_ALWAYS_FATAL_IF(result != OK, "Should only mark known object.");
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}
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void Stability::debugLogStability(const std::string& tag, const sp<IBinder>& binder) {
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ALOGE("%s: stability is %s", tag.c_str(), stabilityString(get(binder.get())).c_str());
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}
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void Stability::markVndk(IBinder* binder) {
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status_t result = set(binder, Level::VENDOR, true /*log*/);
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LOG_ALWAYS_FATAL_IF(result != OK, "Should only mark known object.");
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}
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bool Stability::requiresVintfDeclaration(const sp<IBinder>& binder) {
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return check(get(binder.get()), Level::VINTF);
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}
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void Stability::tryMarkCompilationUnit(IBinder* binder) {
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(void) set(binder, kLocalStability, false /*log*/);
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}
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status_t Stability::set(IBinder* binder, int32_t stability, bool log) {
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Level currentStability = get(binder);
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// null binder is always written w/ 'UNDECLARED' stability
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if (binder == nullptr) {
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if (stability == UNDECLARED) {
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return OK;
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} else {
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if (log) {
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ALOGE("Null binder written with stability %s.",
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stabilityString(stability).c_str());
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}
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return BAD_TYPE;
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}
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}
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if (!isDeclaredStability(stability)) {
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if (log) {
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ALOGE("Can only set known stability, not %d.", stability);
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}
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return BAD_TYPE;
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}
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if (currentStability != Level::UNDECLARED && currentStability != stability) {
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if (log) {
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ALOGE("Interface being set with %s but it is already marked as %s.",
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stabilityString(stability).c_str(), stabilityString(currentStability).c_str());
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}
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return BAD_TYPE;
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}
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if (currentStability == stability) return OK;
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BBinder* local = binder->localBinder();
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if (local != nullptr) {
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local->mStability = static_cast<int32_t>(stability);
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} else {
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binder->remoteBinder()->mStability = static_cast<int32_t>(stability);
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}
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return OK;
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}
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Stability::Level Stability::get(IBinder* binder) {
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if (binder == nullptr) return UNDECLARED;
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BBinder* local = binder->localBinder();
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if (local != nullptr) {
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return static_cast<Stability::Level>(local->mStability);
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}
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return static_cast<Stability::Level>(binder->remoteBinder()->mStability);
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}
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bool Stability::check(int32_t provided, Level required) {
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bool stable = (provided & required) == required;
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if (!isDeclaredStability(provided) && provided != UNDECLARED) {
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ALOGE("Unknown stability when checking interface stability %d.", provided);
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stable = false;
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}
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return stable;
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}
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bool Stability::isDeclaredStability(int32_t stability) {
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return stability == VENDOR || stability == SYSTEM || stability == VINTF;
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}
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std::string Stability::stabilityString(int32_t stability) {
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switch (stability) {
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case Level::UNDECLARED: return "undeclared stability";
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case Level::VENDOR: return "vendor stability";
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case Level::SYSTEM: return "system stability";
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case Level::VINTF: return "vintf stability";
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}
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return "unknown stability " + std::to_string(stability);
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}
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} // namespace internal
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} // namespace stability
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