// Copyright 2016 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CHROMIUMOS_WIDE_PROFILING_PERF_DATA_UTILS_H_
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#define CHROMIUMOS_WIDE_PROFILING_PERF_DATA_UTILS_H_
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#include <stddef.h> // for size_t
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#include <stdlib.h> // for free()
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#include <memory>
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#include "binary_data_utils.h" // for Align<T>
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#include "compat/string.h"
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#include "kernel/perf_internals.h"
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namespace quipper {
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class PerfDataProto_PerfEvent;
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class PerfDataProto_SampleInfo;
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// Based on kernel/perf_internals.h
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const size_t kBuildIDArraySize = 20;
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const size_t kBuildIDStringLength = kBuildIDArraySize * 2;
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// Used by malloced_unique_ptr.
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struct FreeDeleter {
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inline void operator()(void* pointer) { free(pointer); }
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};
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// A modified version of std::unique_ptr that holds a pointer allocated by
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// malloc or its cousins rather than by new. Calls free() to free the pointer
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// when it is destroyed.
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template <typename T>
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using malloced_unique_ptr = std::unique_ptr<T, FreeDeleter>;
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// Allocate |size| bytes of heap memory using calloc, returning the allocated
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// memory as the variable-sized type event_t.
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event_t* CallocMemoryForEvent(size_t size);
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// Reallocate |event| which was previously allocated by CallocMemoryForEvent()
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// to memory with a new size |new_size|.
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event_t* ReallocMemoryForEvent(event_t* event, size_t new_size);
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// Allocate |size| bytes of heap memory using calloc, returning the allocated
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// memory as the variable-sized build ID type.
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build_id_event* CallocMemoryForBuildID(size_t size);
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// In perf data, strings are packed into the smallest number of 8-byte blocks
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// possible, including a null terminator.
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// e.g.
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// "0123" -> 5 bytes -> packed into 8 bytes
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// "0123456" -> 8 bytes -> packed into 8 bytes
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// "01234567" -> 9 bytes -> packed into 16 bytes
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// "0123456789abcd" -> 15 bytes -> packed into 16 bytes
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// "0123456789abcde" -> 16 bytes -> packed into 16 bytes
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// "0123456789abcdef" -> 17 bytes -> packed into 24 bytes
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//
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// Returns the size of the 8-byte-aligned memory for storing |string|.
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inline size_t GetUint64AlignedStringLength(const string& str) {
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return Align<uint64_t>(str.size() + 1);
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}
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// Makes |build_id| fit the perf format, by either truncating it or adding
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// zeroes to the end so that it has length kBuildIDStringLength.
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void PerfizeBuildIDString(string* build_id);
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// Changes |build_id| to the best guess of what the build id was before going
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// through perf. Specifically, it keeps removing trailing sequences of four
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// zero bytes (or eight '0' characters) until there are no more such sequences,
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// or the build id would be empty if the process were repeated.
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void TrimZeroesFromBuildIDString(string* build_id);
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// If |event| is not of type PERF_RECORD_SAMPLE, returns the SampleInfo field
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// within it. Otherwise returns nullptr.
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const PerfDataProto_SampleInfo* GetSampleInfoForEvent(
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const PerfDataProto_PerfEvent& event);
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// Returns the correct |sample_time_ns| field of a PerfEvent.
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uint64_t GetTimeFromPerfEvent(const PerfDataProto_PerfEvent& event);
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} // namespace quipper
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#endif // CHROMIUMOS_WIDE_PROFILING_PERF_DATA_UTILS_H_
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