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      1 /*
      2  * Copyright 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 #include <android/hidl/manager/1.0/IServiceManager.h>
     17 #include <cutils/properties.h>
     18 #include <hidl/ServiceManagement.h>
     19 #include <iostream>
     20 
     21 using namespace std;
     22 using namespace android;
     23 
     24 const string kSysPropHalCoverage = "hal.coverage.enable";
     25 
     26 // Print usage directions.
     27 void usage() {
     28   cout << "usage:\n";
     29   cout << "vts_coverage_configure flush\t\t\t\t: to flush coverage on all "
     30           "HALs\n";
     31   cout << "vts_coverage_configure flush <hal name>@<hal version>\t: to flush "
     32           "coverage on one HAL name/version instance"
     33        << std::endl;
     34 }
     35 
     36 // Parse the fully-qualified instance name and call the func with the interface
     37 // name, instance name, and HAL name.
     38 template <typename Lambda>
     39 bool parseFqInstaceName(string fqInstanceName, Lambda &&func) {
     40   string::size_type n = fqInstanceName.find("/");
     41   if (n == std::string::npos || fqInstanceName.size() == n + 1) return false;
     42 
     43   string fqInterfaceName = fqInstanceName.substr(0, n);
     44   string instanceName = fqInstanceName.substr(n + 1, std::string::npos);
     45 
     46   n = fqInstanceName.find("::");
     47   if (n == std::string::npos || fqInstanceName.size() == n + 1) return false;
     48   string halName = fqInstanceName.substr(0, n);
     49   std::forward<Lambda>(func)(fqInterfaceName, instanceName, halName);
     50   return true;
     51 }
     52 
     53 // Flush coverage on all HAL processes, or just the provided HAL name if
     54 // provided.
     55 bool FlushHALCoverage(string flushHal = "") {
     56   using ::android::hidl::base::V1_0::IBase;
     57   using ::android::hidl::manager::V1_0::IServiceManager;
     58   using ::android::hardware::hidl_string;
     59   using ::android::hardware::Return;
     60 
     61   sp<IServiceManager> sm = ::android::hardware::defaultServiceManager();
     62 
     63   if (sm == nullptr) {
     64     cerr << "failed to get IServiceManager to poke HAL services." << std::endl;
     65     return false;
     66   }
     67   property_set(kSysPropHalCoverage.c_str(), "true");
     68   auto listRet = sm->list([&](const auto &interfaces) {
     69     for (const string &fqInstanceName : interfaces) {
     70       hidl_string fqInterfaceName;
     71       hidl_string instanceName;
     72       string halName;
     73 
     74       auto cb = [&](string fqIface, string instance, string hal) {
     75         fqInterfaceName = fqIface;
     76         instanceName = instance;
     77         halName = hal;
     78       };
     79       if (!parseFqInstaceName(fqInstanceName, cb)) continue;
     80       if (halName.find("android.hidl") == 0) continue;
     81       if (flushHal == "" || !flushHal.compare(halName)) {
     82         Return<sp<IBase>> interfaceRet = sm->get(fqInterfaceName, instanceName);
     83         if (!interfaceRet.isOk()) {
     84           cerr << "failed to get service " << fqInstanceName << ": "
     85                << interfaceRet.description() << std::endl;
     86           continue;
     87         }
     88         sp<IBase> interface = interfaceRet;
     89         auto notifyRet = interface->notifySyspropsChanged();
     90         if (!notifyRet.isOk()) {
     91           cerr << "failed to notifySyspropsChanged on service "
     92                << fqInstanceName << ": " << notifyRet.description()
     93                << std::endl;
     94         }
     95         cout << "- flushed the coverage for HAL " << fqInstanceName
     96              << std::endl;
     97       }
     98     }
     99   });
    100   property_set(kSysPropHalCoverage.c_str(), "false");
    101   if (!listRet.isOk()) {
    102     cerr << "failed to list services: " << listRet.description() << std::endl;
    103     return false;
    104   }
    105   return true;
    106 }
    107 
    108 // The provided binary can be used to flush coverage on one or all HALs.
    109 // Usage examples:
    110 //   To flush gcov and/or sancov coverage data on all hals: <binary> flush
    111 //   To flush gcov and/or sancov coverage data on one hal: <binary> flush <hal
    112 //   name>@<hal version>
    113 int main(int argc, char *argv[]) {
    114   bool flush_coverage = false;
    115   if (argc < 2) {
    116     usage();
    117     return -1;
    118   }
    119   if (!strcmp(argv[1], "flush")) {
    120     flush_coverage = true;
    121     string halString = "";
    122     if (argc == 3) {
    123       halString = string(argv[2]);
    124     }
    125     cout << "* flush coverage" << std::endl;
    126     if (!FlushHALCoverage(halString)) {
    127       cerr << "failed to flush coverage" << std::endl;
    128     }
    129   } else {
    130     usage();
    131   }
    132   return 0;
    133 }
    134