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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/metrics/call_stack_profile_metrics_provider.h"
#include <cstring>
#include <map>
#include <utility>
#include "base/logging.h"
#include "base/macros.h"
#include "base/profiler/stack_sampling_profiler.h"
#include "components/metrics/metrics_hashes.h"
#include "components/metrics/proto/chrome_user_metrics_extension.pb.h"
using base::StackSamplingProfiler;
namespace metrics {
namespace {
// The protobuf expects the MD5 checksum prefix of the module name.
uint64 HashModuleFilename(const base::FilePath& filename) {
const base::FilePath::StringType basename = filename.BaseName().value();
// Copy the bytes in basename into a string buffer.
size_t basename_length_in_bytes =
basename.size() * sizeof(base::FilePath::CharType);
std::string name_bytes(basename_length_in_bytes, '\0');
memcpy(&name_bytes[0], &basename[0], basename_length_in_bytes);
return HashMetricName(name_bytes);
}
// Transcode |sample| into |proto_sample|, using base addresses in |modules| to
// compute module instruction pointer offsets.
void CopySampleToProto(
const StackSamplingProfiler::Sample& sample,
const std::vector<StackSamplingProfiler::Module>& modules,
CallStackProfile::Sample* proto_sample) {
for (const StackSamplingProfiler::Frame& frame : sample) {
CallStackProfile::Entry* entry = proto_sample->add_entry();
// A frame may not have a valid module. If so, we can't compute the
// instruction pointer offset, and we don't want to send bare pointers, so
// leave call_stack_entry empty.
if (frame.module_index < 0)
continue;
int64 module_offset =
reinterpret_cast<const char*>(frame.instruction_pointer) -
reinterpret_cast<const char*>(modules[frame.module_index].base_address);
DCHECK_GE(module_offset, 0);
entry->set_address(static_cast<uint64>(module_offset));
entry->set_module_id_index(frame.module_index);
}
}
// Transcode |profile| into |proto_profile|.
void CopyProfileToProto(
const StackSamplingProfiler::Profile& profile,
CallStackProfile* proto_profile) {
if (profile.samples.empty())
return;
if (profile.preserve_sample_ordering) {
// Collapse only consecutive repeated samples together.
CallStackProfile::Sample* current_sample_proto = nullptr;
for (auto it = profile.samples.begin(); it != profile.samples.end(); ++it) {
if (!current_sample_proto || *it != *(it - 1)) {
current_sample_proto = proto_profile->add_sample();
CopySampleToProto(*it, profile.modules, current_sample_proto);
current_sample_proto->set_count(1);
} else {
current_sample_proto->set_count(current_sample_proto->count() + 1);
}
}
} else {
// Collapse all repeated samples together.
std::map<StackSamplingProfiler::Sample, int> sample_index;
for (auto it = profile.samples.begin(); it != profile.samples.end(); ++it) {
auto location = sample_index.find(*it);
if (location == sample_index.end()) {
CallStackProfile::Sample* sample_proto = proto_profile->add_sample();
CopySampleToProto(*it, profile.modules, sample_proto);
sample_proto->set_count(1);
sample_index.insert(
std::make_pair(
*it, static_cast<int>(proto_profile->sample().size()) - 1));
} else {
CallStackProfile::Sample* sample_proto =
proto_profile->mutable_sample()->Mutable(location->second);
sample_proto->set_count(sample_proto->count() + 1);
}
}
}
for (const StackSamplingProfiler::Module& module : profile.modules) {
CallStackProfile::ModuleIdentifier* module_id =
proto_profile->add_module_id();
module_id->set_build_id(module.id);
module_id->set_name_md5_prefix(HashModuleFilename(module.filename));
}
proto_profile->set_profile_duration_ms(
profile.profile_duration.InMilliseconds());
proto_profile->set_sampling_period_ms(
profile.sampling_period.InMilliseconds());
}
} // namespace
CallStackProfileMetricsProvider::CallStackProfileMetricsProvider() {}
CallStackProfileMetricsProvider::~CallStackProfileMetricsProvider() {}
void CallStackProfileMetricsProvider::ProvideGeneralMetrics(
ChromeUserMetricsExtension* uma_proto) {
std::vector<StackSamplingProfiler::Profile> profiles;
if (!source_profiles_for_test_.empty())
profiles.swap(source_profiles_for_test_);
else
StackSamplingProfiler::GetPendingProfiles(&profiles);
for (const StackSamplingProfiler::Profile& profile : profiles) {
CallStackProfile* call_stack_profile =
uma_proto->add_sampled_profile()->mutable_call_stack_profile();
CopyProfileToProto(profile, call_stack_profile);
}
}
void CallStackProfileMetricsProvider::SetSourceProfilesForTesting(
const std::vector<StackSamplingProfiler::Profile>& profiles) {
source_profiles_for_test_ = profiles;
}
} // namespace metrics
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