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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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/persistent_histogram_allocator.h" | 5 #include "base/metrics/persistent_histogram_allocator.h" |
6 | 6 |
7 #include "base/lazy_instance.h" | 7 #include "base/lazy_instance.h" |
8 #include "base/logging.h" | 8 #include "base/logging.h" |
9 #include "base/memory/scoped_ptr.h" | 9 #include "base/memory/scoped_ptr.h" |
10 #include "base/metrics/histogram.h" | 10 #include "base/metrics/histogram.h" |
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288 RecordCreateHistogramResult(CREATE_HISTOGRAM_SUCCESS); | 288 RecordCreateHistogramResult(CREATE_HISTOGRAM_SUCCESS); |
289 return histogram; | 289 return histogram; |
290 } | 290 } |
291 | 291 |
292 // Copy the histogram_data to local storage because anything in persistent | 292 // Copy the histogram_data to local storage because anything in persistent |
293 // memory cannot be trusted as it could be changed at any moment by a | 293 // memory cannot be trusted as it could be changed at any moment by a |
294 // malicious actor that shares access. The contents of histogram_data are | 294 // malicious actor that shares access. The contents of histogram_data are |
295 // validated below; the local copy is to ensure that the contents cannot | 295 // validated below; the local copy is to ensure that the contents cannot |
296 // be externally changed between validation and use. | 296 // be externally changed between validation and use. |
297 PersistentHistogramData histogram_data = *histogram_data_ptr; | 297 PersistentHistogramData histogram_data = *histogram_data_ptr; |
298 CHECK_EQ(histogram_data.histogram_type, histogram_data_ptr->histogram_type); | |
299 CHECK_EQ(histogram_data.flags, histogram_data_ptr->flags); | |
300 CHECK_EQ(histogram_data.minimum, histogram_data_ptr->minimum); | |
301 CHECK_EQ(histogram_data.maximum, histogram_data_ptr->maximum); | |
302 CHECK_EQ(histogram_data.bucket_count, histogram_data_ptr->bucket_count); | |
303 CHECK_EQ(histogram_data.ranges_checksum, histogram_data_ptr->ranges_checksum); | |
304 | 298 |
305 HistogramBase::Sample* ranges_data = | 299 HistogramBase::Sample* ranges_data = |
306 memory_allocator_->GetAsObject<HistogramBase::Sample>( | 300 memory_allocator_->GetAsObject<HistogramBase::Sample>( |
307 histogram_data.ranges_ref, kTypeIdRangesArray); | 301 histogram_data.ranges_ref, kTypeIdRangesArray); |
308 | 302 |
309 const uint32_t max_buckets = | 303 const uint32_t max_buckets = |
310 std::numeric_limits<uint32_t>::max() / sizeof(HistogramBase::Sample); | 304 std::numeric_limits<uint32_t>::max() / sizeof(HistogramBase::Sample); |
311 size_t required_bytes = | 305 size_t required_bytes = |
312 (histogram_data.bucket_count + 1) * sizeof(HistogramBase::Sample); | 306 (histogram_data.bucket_count + 1) * sizeof(HistogramBase::Sample); |
313 size_t allocated_bytes = | 307 size_t allocated_bytes = |
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344 NOTREACHED(); | 338 NOTREACHED(); |
345 return nullptr; | 339 return nullptr; |
346 } | 340 } |
347 | 341 |
348 // After the main "counts" array is a second array using for storing what | 342 // After the main "counts" array is a second array using for storing what |
349 // was previously logged. This is used to calculate the "delta" during | 343 // was previously logged. This is used to calculate the "delta" during |
350 // snapshot operations. | 344 // snapshot operations. |
351 HistogramBase::AtomicCount* logged_data = | 345 HistogramBase::AtomicCount* logged_data = |
352 counts_data + histogram_data.bucket_count; | 346 counts_data + histogram_data.bucket_count; |
353 | 347 |
354 CHECK_LT(0, histogram_data.minimum); | |
355 CHECK_LT(0, histogram_data.maximum); | |
356 std::string name(histogram_data_ptr->name); | 348 std::string name(histogram_data_ptr->name); |
357 scoped_ptr<HistogramBase> histogram; | 349 scoped_ptr<HistogramBase> histogram; |
358 switch (histogram_data.histogram_type) { | 350 switch (histogram_data.histogram_type) { |
359 case HISTOGRAM: | 351 case HISTOGRAM: |
360 histogram = Histogram::PersistentCreate( | 352 histogram = Histogram::PersistentCreate( |
361 name, histogram_data.minimum, histogram_data.maximum, ranges, | 353 name, histogram_data.minimum, histogram_data.maximum, ranges, |
362 counts_data, logged_data, histogram_data.bucket_count, | 354 counts_data, logged_data, histogram_data.bucket_count, |
363 &histogram_data_ptr->samples_metadata, | 355 &histogram_data_ptr->samples_metadata, |
364 &histogram_data_ptr->logged_metadata); | 356 &histogram_data_ptr->logged_metadata); |
365 DCHECK(histogram); | 357 DCHECK(histogram); |
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586 scoped_ptr<HistogramBase> histogram = | 578 scoped_ptr<HistogramBase> histogram = |
587 g_allocator->GetNextHistogramWithIgnore(&iter, last_created); | 579 g_allocator->GetNextHistogramWithIgnore(&iter, last_created); |
588 if (!histogram) | 580 if (!histogram) |
589 break; | 581 break; |
590 StatisticsRecorder::RegisterOrDeleteDuplicate(histogram.release()); | 582 StatisticsRecorder::RegisterOrDeleteDuplicate(histogram.release()); |
591 } | 583 } |
592 } | 584 } |
593 } | 585 } |
594 | 586 |
595 } // namespace base | 587 } // namespace base |
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