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/*
* Copyright (C) 2019 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <binder/Stability.h>
namespace android {
namespace internal {
void Stability::markCompilationUnit(IBinder* binder) {
status_t result = set(binder, kLocalStability, true /*log*/);
LOG_ALWAYS_FATAL_IF(result != OK, "Should only mark known object.");
}
void Stability::markVintf(IBinder* binder) {
status_t result = set(binder, Level::VINTF, true /*log*/);
LOG_ALWAYS_FATAL_IF(result != OK, "Should only mark known object.");
}
void Stability::debugLogStability(const std::string& tag, const sp<IBinder>& binder) {
ALOGE("%s: stability is %s", tag.c_str(), stabilityString(get(binder.get())).c_str());
}
void Stability::markVndk(IBinder* binder) {
status_t result = set(binder, Level::VENDOR, true /*log*/);
LOG_ALWAYS_FATAL_IF(result != OK, "Should only mark known object.");
}
bool Stability::requiresVintfDeclaration(const sp<IBinder>& binder) {
return check(get(binder.get()), Level::VINTF);
}
void Stability::tryMarkCompilationUnit(IBinder* binder) {
(void) set(binder, kLocalStability, false /*log*/);
}
status_t Stability::set(IBinder* binder, int32_t stability, bool log) {
Level currentStability = get(binder);
// null binder is always written w/ 'UNDECLARED' stability
if (binder == nullptr) {
if (stability == UNDECLARED) {
return OK;
} else {
if (log) {
ALOGE("Null binder written with stability %s.",
stabilityString(stability).c_str());
}
return BAD_TYPE;
}
}
if (!isDeclaredStability(stability)) {
if (log) {
ALOGE("Can only set known stability, not %d.", stability);
}
return BAD_TYPE;
}
if (currentStability != Level::UNDECLARED && currentStability != stability) {
if (log) {
ALOGE("Interface being set with %s but it is already marked as %s.",
stabilityString(stability).c_str(), stabilityString(currentStability).c_str());
}
return BAD_TYPE;
}
if (currentStability == stability) return OK;
binder->attachObject(
reinterpret_cast<void*>(&Stability::get),
reinterpret_cast<void*>(stability),
nullptr /*cleanupCookie*/,
nullptr /*cleanup function*/);
return OK;
}
Stability::Level Stability::get(IBinder* binder) {
if (binder == nullptr) return UNDECLARED;
return static_cast<Level>(reinterpret_cast<intptr_t>(
binder->findObject(reinterpret_cast<void*>(&Stability::get))));
}
bool Stability::check(int32_t provided, Level required) {
bool stable = (provided & required) == required;
if (!isDeclaredStability(provided) && provided != UNDECLARED) {
ALOGE("Unknown stability when checking interface stability %d.", provided);
stable = false;
}
return stable;
}
bool Stability::isDeclaredStability(int32_t stability) {
return stability == VENDOR || stability == SYSTEM || stability == VINTF;
}
std::string Stability::stabilityString(int32_t stability) {
switch (stability) {
case Level::UNDECLARED: return "undeclared stability";
case Level::VENDOR: return "vendor stability";
case Level::SYSTEM: return "system stability";
case Level::VINTF: return "vintf stability";
}
return "unknown stability " + std::to_string(stability);
}
} // namespace internal
} // namespace stability
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