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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/metrics/sample_map.h" | 5 #include "base/metrics/sample_map.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "base/memory/ptr_util.h" | 8 #include "base/memory/ptr_util.h" |
| 9 #include "base/numerics/safe_conversions.h" |
9 #include "base/stl_util.h" | 10 #include "base/stl_util.h" |
10 | 11 |
11 namespace base { | 12 namespace base { |
12 | 13 |
13 typedef HistogramBase::Count Count; | 14 typedef HistogramBase::Count Count; |
14 typedef HistogramBase::Sample Sample; | 15 typedef HistogramBase::Sample Sample; |
15 | 16 |
16 namespace { | 17 namespace { |
17 | 18 |
18 // An iterator for going through a SampleMap. The logic here is identical | 19 // An iterator for going through a SampleMap. The logic here is identical |
19 // to that of PersistentSampleMapIterator but with different data structures. | 20 // to that of PersistentSampleMapIterator but with different data structures. |
20 // Changes here likely need to be duplicated there. | 21 // Changes here likely need to be duplicated there. |
21 class SampleMapIterator : public SampleCountIterator { | 22 class SampleMapIterator : public SampleCountIterator { |
22 public: | 23 public: |
23 typedef std::map<HistogramBase::Sample, HistogramBase::Count> | 24 typedef std::map<HistogramBase::Sample, HistogramBase::Count> |
24 SampleToCountMap; | 25 SampleToCountMap; |
25 | 26 |
26 explicit SampleMapIterator(const SampleToCountMap& sample_counts); | 27 explicit SampleMapIterator(const SampleToCountMap& sample_counts); |
27 ~SampleMapIterator() override; | 28 ~SampleMapIterator() override; |
28 | 29 |
29 // SampleCountIterator: | 30 // SampleCountIterator: |
30 bool Done() const override; | 31 bool Done() const override; |
31 void Next() override; | 32 void Next() override; |
32 void Get(HistogramBase::Sample* min, | 33 void Get(HistogramBase::Sample* min, |
33 HistogramBase::Sample* max, | 34 int64_t* max, |
34 HistogramBase::Count* count) const override; | 35 HistogramBase::Count* count) const override; |
35 | 36 |
36 private: | 37 private: |
37 void SkipEmptyBuckets(); | 38 void SkipEmptyBuckets(); |
38 | 39 |
39 SampleToCountMap::const_iterator iter_; | 40 SampleToCountMap::const_iterator iter_; |
40 const SampleToCountMap::const_iterator end_; | 41 const SampleToCountMap::const_iterator end_; |
41 }; | 42 }; |
42 | 43 |
43 SampleMapIterator::SampleMapIterator(const SampleToCountMap& sample_counts) | 44 SampleMapIterator::SampleMapIterator(const SampleToCountMap& sample_counts) |
44 : iter_(sample_counts.begin()), | 45 : iter_(sample_counts.begin()), |
45 end_(sample_counts.end()) { | 46 end_(sample_counts.end()) { |
46 SkipEmptyBuckets(); | 47 SkipEmptyBuckets(); |
47 } | 48 } |
48 | 49 |
49 SampleMapIterator::~SampleMapIterator() {} | 50 SampleMapIterator::~SampleMapIterator() {} |
50 | 51 |
51 bool SampleMapIterator::Done() const { | 52 bool SampleMapIterator::Done() const { |
52 return iter_ == end_; | 53 return iter_ == end_; |
53 } | 54 } |
54 | 55 |
55 void SampleMapIterator::Next() { | 56 void SampleMapIterator::Next() { |
56 DCHECK(!Done()); | 57 DCHECK(!Done()); |
57 ++iter_; | 58 ++iter_; |
58 SkipEmptyBuckets(); | 59 SkipEmptyBuckets(); |
59 } | 60 } |
60 | 61 |
61 void SampleMapIterator::Get(Sample* min, Sample* max, Count* count) const { | 62 void SampleMapIterator::Get(Sample* min, int64_t* max, Count* count) const { |
62 DCHECK(!Done()); | 63 DCHECK(!Done()); |
63 if (min) | 64 if (min) |
64 *min = iter_->first; | 65 *min = iter_->first; |
65 if (max) | 66 if (max) |
66 *max = iter_->first + 1; | 67 *max = strict_cast<int64_t>(iter_->first) + 1; |
67 if (count) | 68 if (count) |
68 *count = iter_->second; | 69 *count = iter_->second; |
69 } | 70 } |
70 | 71 |
71 void SampleMapIterator::SkipEmptyBuckets() { | 72 void SampleMapIterator::SkipEmptyBuckets() { |
72 while (!Done() && iter_->second == 0) { | 73 while (!Done() && iter_->second == 0) { |
73 ++iter_; | 74 ++iter_; |
74 } | 75 } |
75 } | 76 } |
76 | 77 |
77 } // namespace | 78 } // namespace |
78 | 79 |
79 SampleMap::SampleMap() : SampleMap(0) {} | 80 SampleMap::SampleMap() : SampleMap(0) {} |
80 | 81 |
81 SampleMap::SampleMap(uint64_t id) : HistogramSamples(id) {} | 82 SampleMap::SampleMap(uint64_t id) : HistogramSamples(id) {} |
82 | 83 |
83 SampleMap::~SampleMap() {} | 84 SampleMap::~SampleMap() {} |
84 | 85 |
85 void SampleMap::Accumulate(Sample value, Count count) { | 86 void SampleMap::Accumulate(Sample value, Count count) { |
86 sample_counts_[value] += count; | 87 sample_counts_[value] += count; |
87 IncreaseSumAndCount(static_cast<int64_t>(count) * value, count); | 88 IncreaseSumAndCount(strict_cast<int64_t>(count) * value, count); |
88 } | 89 } |
89 | 90 |
90 Count SampleMap::GetCount(Sample value) const { | 91 Count SampleMap::GetCount(Sample value) const { |
91 std::map<Sample, Count>::const_iterator it = sample_counts_.find(value); | 92 std::map<Sample, Count>::const_iterator it = sample_counts_.find(value); |
92 if (it == sample_counts_.end()) | 93 if (it == sample_counts_.end()) |
93 return 0; | 94 return 0; |
94 return it->second; | 95 return it->second; |
95 } | 96 } |
96 | 97 |
97 Count SampleMap::TotalCount() const { | 98 Count SampleMap::TotalCount() const { |
98 Count count = 0; | 99 Count count = 0; |
99 for (const auto& entry : sample_counts_) { | 100 for (const auto& entry : sample_counts_) { |
100 count += entry.second; | 101 count += entry.second; |
101 } | 102 } |
102 return count; | 103 return count; |
103 } | 104 } |
104 | 105 |
105 std::unique_ptr<SampleCountIterator> SampleMap::Iterator() const { | 106 std::unique_ptr<SampleCountIterator> SampleMap::Iterator() const { |
106 return WrapUnique(new SampleMapIterator(sample_counts_)); | 107 return WrapUnique(new SampleMapIterator(sample_counts_)); |
107 } | 108 } |
108 | 109 |
109 bool SampleMap::AddSubtractImpl(SampleCountIterator* iter, Operator op) { | 110 bool SampleMap::AddSubtractImpl(SampleCountIterator* iter, Operator op) { |
110 Sample min; | 111 Sample min; |
111 Sample max; | 112 int64_t max; |
112 Count count; | 113 Count count; |
113 for (; !iter->Done(); iter->Next()) { | 114 for (; !iter->Done(); iter->Next()) { |
114 iter->Get(&min, &max, &count); | 115 iter->Get(&min, &max, &count); |
115 if (min + 1 != max) | 116 if (strict_cast<int64_t>(min) + 1 != max) |
116 return false; // SparseHistogram only supports bucket with size 1. | 117 return false; // SparseHistogram only supports bucket with size 1. |
117 | 118 |
118 sample_counts_[min] += (op == HistogramSamples::ADD) ? count : -count; | 119 sample_counts_[min] += (op == HistogramSamples::ADD) ? count : -count; |
119 } | 120 } |
120 return true; | 121 return true; |
121 } | 122 } |
122 | 123 |
123 } // namespace base | 124 } // namespace base |
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