Home | History | Annotate | Download | only in perfprofd 
      1 /*
      2  * Copyright (C) 2018 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 
     17 #include <iterator>
     18 
     19 #include "perf_data.pb.h"
     20 
     21 namespace android {
     22 namespace perfprofd {
     23 namespace quipper {
     24 
     25 template<typename Iterator, typename Predicate>
     26 class FilteredIterator {
     27  public:
     28   using value_type =      typename std::iterator_traits<Iterator>::value_type;
     29   using difference_type = typename std::iterator_traits<Iterator>::difference_type;
     30   using reference =       typename std::iterator_traits<Iterator>::reference;
     31   using pointer =         typename std::iterator_traits<Iterator>::pointer;
     32 
     33   FilteredIterator(const Iterator& begin, const Iterator& end, const Predicate& pred)
     34       : iter_(begin), end_(end), pred_(pred) {
     35     filter();
     36   }
     37 
     38   reference operator*() const {
     39     return *iter_;
     40   }
     41   pointer operator->() const {
     42     return std::addressof(*iter_);
     43   }
     44 
     45   FilteredIterator& operator++() {
     46     ++iter_;
     47     filter();
     48     return *this;
     49   }
     50 
     51   FilteredIterator end() {
     52     return FilteredIterator(end_, end_, pred_);
     53   }
     54 
     55   bool operator==(const FilteredIterator& rhs) const {
     56     return iter_ == rhs.iter_;
     57   }
     58   bool operator!=(const FilteredIterator& rhs) const {
     59     return !(operator==(rhs));
     60   }
     61 
     62 private:
     63   void filter() {
     64     while (iter_ != end_ && !pred_(*iter_)) {
     65       ++iter_;
     66     }
     67   }
     68 
     69   Iterator iter_;
     70   Iterator end_;
     71   Predicate pred_;
     72 };
     73 
     74 template <typename Predicate>
     75 using EventFilteredIterator = FilteredIterator<
     76     decltype(static_cast<::quipper::PerfDataProto*>(nullptr)->events().begin()),
     77     Predicate>;
     78 
     79 struct CommEventPredicate {
     80   bool operator()(const ::quipper::PerfDataProto_PerfEvent& evt) {
     81     return evt.has_comm_event();
     82   }
     83 };
     84 struct CommEventIterator : public EventFilteredIterator<CommEventPredicate> {
     85   explicit CommEventIterator(const ::quipper::PerfDataProto& proto)
     86       : EventFilteredIterator<CommEventPredicate>(proto.events().begin(),
     87                                                   proto.events().end(),
     88                                                   CommEventPredicate()) {
     89   }
     90 };
     91 
     92 struct MmapEventPredicate {
     93   bool operator()(const ::quipper::PerfDataProto_PerfEvent& evt) {
     94     return evt.has_mmap_event();
     95   }
     96 };
     97 struct MmapEventIterator : public EventFilteredIterator<MmapEventPredicate> {
     98   explicit MmapEventIterator(const ::quipper::PerfDataProto& proto)
     99       : EventFilteredIterator<MmapEventPredicate>(proto.events().begin(),
    100                                                   proto.events().end(),
    101                                                   MmapEventPredicate()) {
    102   }
    103 };
    104 
    105 struct SampleEventPredicate {
    106   bool operator()(const ::quipper::PerfDataProto_PerfEvent& evt) {
    107     return evt.has_sample_event();
    108   }
    109 };
    110 struct SampleEventIterator : public EventFilteredIterator<SampleEventPredicate> {
    111   explicit SampleEventIterator(const ::quipper::PerfDataProto& proto)
    112       : EventFilteredIterator<SampleEventPredicate>(proto.events().begin(),
    113                                                     proto.events().end(),
    114                                                     SampleEventPredicate()) {
    115   }
    116 };
    117 
    118 struct ForkEventPredicate {
    119   bool operator()(const ::quipper::PerfDataProto_PerfEvent& evt) {
    120     return evt.has_fork_event();
    121   }
    122 };
    123 struct ForkEventIterator : public EventFilteredIterator<ForkEventPredicate> {
    124   explicit ForkEventIterator(const ::quipper::PerfDataProto& proto)
    125       : EventFilteredIterator<ForkEventPredicate>(proto.events().begin(),
    126                                                   proto.events().end(),
    127                                                   ForkEventPredicate()) {
    128   }
    129 };
    130 
    131 struct ExitEventPredicate {
    132   bool operator()(const ::quipper::PerfDataProto_PerfEvent& evt) {
    133     return evt.has_exit_event();
    134   }
    135 };
    136 struct ExitEventIterator : public EventFilteredIterator<ExitEventPredicate> {
    137   explicit ExitEventIterator(const ::quipper::PerfDataProto& proto)
    138       : EventFilteredIterator<ExitEventPredicate>(proto.events().begin(),
    139                                                   proto.events().end(),
    140                                                   ExitEventPredicate()) {
    141   }
    142 };
    143 
    144 }  // namespace quipper
    145 }  // namespace perfprofd
    146 }  // namespace android
    147