// 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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#include "perf_data_utils.h"
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#include <string>
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#include "base/logging.h"
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#include "compat/proto.h"
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namespace quipper {
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event_t* CallocMemoryForEvent(size_t size) {
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event_t* event = reinterpret_cast<event_t*>(calloc(1, size));
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CHECK(event);
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return event;
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}
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event_t* ReallocMemoryForEvent(event_t* event, size_t new_size) {
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event_t* new_event = reinterpret_cast<event_t*>(realloc(event, new_size));
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CHECK(new_event); // NB: event is "leaked" if this CHECK fails.
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return new_event;
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}
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build_id_event* CallocMemoryForBuildID(size_t size) {
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build_id_event* event = reinterpret_cast<build_id_event*>(calloc(1, size));
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CHECK(event);
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return event;
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}
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void PerfizeBuildIDString(string* build_id) {
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build_id->resize(kBuildIDStringLength, '0');
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}
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void TrimZeroesFromBuildIDString(string* build_id) {
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const size_t kPaddingSize = 8;
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const string kBuildIDPadding = string(kPaddingSize, '0');
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// Remove kBuildIDPadding from the end of build_id until we cannot remove any
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// more. The build ID string can be reduced down to an empty string. This
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// could happen if the file did not have a build ID but was given a build ID
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// of all zeroes. The empty build ID string would reflect the original lack of
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// build ID.
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while (build_id->size() >= kPaddingSize &&
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build_id->substr(build_id->size() - kPaddingSize) == kBuildIDPadding) {
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build_id->resize(build_id->size() - kPaddingSize);
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}
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}
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const PerfDataProto_SampleInfo* GetSampleInfoForEvent(
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const PerfDataProto_PerfEvent& event) {
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switch (event.header().type()) {
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case PERF_RECORD_MMAP:
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case PERF_RECORD_MMAP2:
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return &event.mmap_event().sample_info();
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case PERF_RECORD_COMM:
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return &event.comm_event().sample_info();
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case PERF_RECORD_FORK:
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return &event.fork_event().sample_info();
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case PERF_RECORD_EXIT:
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return &event.exit_event().sample_info();
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case PERF_RECORD_LOST:
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return &event.lost_event().sample_info();
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case PERF_RECORD_THROTTLE:
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case PERF_RECORD_UNTHROTTLE:
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return &event.throttle_event().sample_info();
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case PERF_RECORD_READ:
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return &event.read_event().sample_info();
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case PERF_RECORD_AUX:
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return &event.aux_event().sample_info();
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}
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return nullptr;
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}
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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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if (event.header().type() == PERF_RECORD_SAMPLE)
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return event.sample_event().sample_time_ns();
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const auto* sample_info = GetSampleInfoForEvent(event);
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if (sample_info) return sample_info->sample_time_ns();
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return 0;
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}
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} // namespace quipper
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