simpleperf/cmd_report.cpp

   1 /*
   2  * Copyright (C) 2015 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <inttypes.h>
  18 #include <algorithm>
  19 #include <functional>
  20 #include <map>
  21 #include <set>
  22 #include <string>
  23 #include <unordered_map>
  24 #include <unordered_set>
  25 #include <vector>
  26
  27 #include <android-base/logging.h>
  28 #include <android-base/parseint.h>
  29 #include <android-base/stringprintf.h>
  30 #include <android-base/strings.h>
  31
  32 #include "command.h"
  33 #include "dwarf_unwind.h"
  34 #include "environment.h"
  35 #include "event_attr.h"
  36 #include "event_type.h"
  37 #include "perf_regs.h"
  38 #include "record.h"
  39 #include "record_file.h"
  40 #include "sample_tree.h"
  41 #include "thread_tree.h"
  42 #include "tracing.h"
  43 #include "utils.h"
  44
  45 namespace {
  46
  47 static std::set<std::string> branch_sort_keys = {
  48     "dso_from", "dso_to", "symbol_from", "symbol_to",
  49 };
  50 struct BranchFromEntry {
  51   const MapEntry* map;
  52   const Symbol* symbol;
  53   uint64_t vaddr_in_file;
  54   uint64_t flags;
  55
  56   BranchFromEntry()
  57       : map(nullptr), symbol(nullptr), vaddr_in_file(0), flags(0) {}
  58 };
  59
  60 struct SampleEntry {
  61   uint64_t time;
  62   uint64_t period;
  63   // accumuated when appearing in other sample's callchain
  64   uint64_t accumulated_period;
  65   uint64_t sample_count;
  66   const ThreadEntry* thread;
  67   const char* thread_comm;
  68   const MapEntry* map;
  69   const Symbol* symbol;
  70   uint64_t vaddr_in_file;
  71   BranchFromEntry branch_from;
  72   // a callchain tree representing all callchains in the sample
  73   CallChainRoot<SampleEntry> callchain;
  74
  75   SampleEntry(uint64_t time, uint64_t period, uint64_t accumulated_period,
  76               uint64_t sample_count, const ThreadEntry* thread,
  77               const MapEntry* map, const Symbol* symbol, uint64_t vaddr_in_file)
  78       : time(time),
  79         period(period),
  80         accumulated_period(accumulated_period),
  81         sample_count(sample_count),
  82         thread(thread),
  83         thread_comm(thread->comm),
  84         map(map),
  85         symbol(symbol),
  86         vaddr_in_file(vaddr_in_file) {}
  87
  88   // The data member 'callchain' can only move, not copy.
  89   SampleEntry(SampleEntry&&) = default;
  90   SampleEntry(SampleEntry&) = delete;
  91 };
  92
  93 struct SampleTree {
  94   std::vector<SampleEntry*> samples;
  95   uint64_t total_samples;
  96   uint64_t total_period;
  97 };
  98
  99 BUILD_COMPARE_VALUE_FUNCTION(CompareVaddrInFile, vaddr_in_file);
 100 BUILD_DISPLAY_HEX64_FUNCTION(DisplayVaddrInFile, vaddr_in_file);
 101
 102 class ReportCmdSampleTreeBuilder
 103     : public SampleTreeBuilder<SampleEntry, uint64_t> {
 104  public:
 105   ReportCmdSampleTreeBuilder(SampleComparator<SampleEntry> sample_comparator,
 106                              ThreadTree* thread_tree)
 107       : SampleTreeBuilder(sample_comparator),
 108         thread_tree_(thread_tree),
 109         total_samples_(0),
 110         total_period_(0) {}
 111
 112   void SetFilters(const std::unordered_set<int>& pid_filter,
 113                   const std::unordered_set<int>& tid_filter,
 114                   const std::unordered_set<std::string>& comm_filter,
 115                   const std::unordered_set<std::string>& dso_filter,
 116                   const std::unordered_set<std::string>& symbol_filter) {
 117     pid_filter_ = pid_filter;
 118     tid_filter_ = tid_filter;
 119     comm_filter_ = comm_filter;
 120     dso_filter_ = dso_filter;
 121     symbol_filter_ = symbol_filter;
 122   }
 123
 124   SampleTree GetSampleTree() const {
 125     SampleTree sample_tree;
 126     sample_tree.samples = GetSamples();
 127     sample_tree.total_samples = total_samples_;
 128     sample_tree.total_period = total_period_;
 129     return sample_tree;
 130   }
 131
 132  protected:
 133   SampleEntry* CreateSample(const SampleRecord& r, bool in_kernel,
 134                             uint64_t* acc_info) override {
 135     const ThreadEntry* thread =
 136         thread_tree_->FindThreadOrNew(r.tid_data.pid, r.tid_data.tid);
 137     const MapEntry* map =
 138         thread_tree_->FindMap(thread, r.ip_data.ip, in_kernel);
 139     uint64_t vaddr_in_file;
 140     const Symbol* symbol =
 141         thread_tree_->FindSymbol(map, r.ip_data.ip, &vaddr_in_file);
 142     *acc_info = r.period_data.period;
 143     return InsertSample(std::unique_ptr<SampleEntry>(
 144         new SampleEntry(r.time_data.time, r.period_data.period, 0, 1, thread,
 145                         map, symbol, vaddr_in_file)));
 146   }
 147
 148   SampleEntry* CreateBranchSample(const SampleRecord& r,
 149                                   const BranchStackItemType& item) override {
 150     const ThreadEntry* thread =
 151         thread_tree_->FindThreadOrNew(r.tid_data.pid, r.tid_data.tid);
 152     const MapEntry* from_map = thread_tree_->FindMap(thread, item.from);
 153     uint64_t from_vaddr_in_file;
 154     const Symbol* from_symbol =
 155         thread_tree_->FindSymbol(from_map, item.from, &from_vaddr_in_file);
 156     const MapEntry* to_map = thread_tree_->FindMap(thread, item.to);
 157     uint64_t to_vaddr_in_file;
 158     const Symbol* to_symbol =
 159         thread_tree_->FindSymbol(to_map, item.to, &to_vaddr_in_file);
 160     std::unique_ptr<SampleEntry> sample(
 161         new SampleEntry(r.time_data.time, r.period_data.period, 0, 1, thread,
 162                         to_map, to_symbol, to_vaddr_in_file));
 163     sample->branch_from.map = from_map;
 164     sample->branch_from.symbol = from_symbol;
 165     sample->branch_from.vaddr_in_file = from_vaddr_in_file;
 166     sample->branch_from.flags = item.flags;
 167     return InsertSample(std::move(sample));
 168   }
 169
 170   SampleEntry* CreateCallChainSample(const SampleEntry* sample, uint64_t ip,
 171                                      bool in_kernel,
 172                                      const std::vector<SampleEntry*>& callchain,
 173                                      const uint64_t& acc_info) override {
 174     const ThreadEntry* thread = sample->thread;
 175     const MapEntry* map = thread_tree_->FindMap(thread, ip, in_kernel);
 176     uint64_t vaddr_in_file;
 177     const Symbol* symbol = thread_tree_->FindSymbol(map, ip, &vaddr_in_file);
 178     std::unique_ptr<SampleEntry> callchain_sample(new SampleEntry(
 179         sample->time, 0, acc_info, 0, thread, map, symbol, vaddr_in_file));
 180     return InsertCallChainSample(std::move(callchain_sample), callchain);
 181   }
 182
 183   const ThreadEntry* GetThreadOfSample(SampleEntry* sample) override {
 184     return sample->thread;
 185   }
 186
 187   uint64_t GetPeriodForCallChain(const uint64_t& acc_info) override {
 188     return acc_info;
 189   }
 190
 191   bool FilterSample(const SampleEntry* sample) override {
 192     if (!pid_filter_.empty() &&
 193         pid_filter_.find(sample->thread->pid) == pid_filter_.end()) {
 194       return false;
 195     }
 196     if (!tid_filter_.empty() &&
 197         tid_filter_.find(sample->thread->tid) == tid_filter_.end()) {
 198       return false;
 199     }
 200     if (!comm_filter_.empty() &&
 201         comm_filter_.find(sample->thread_comm) == comm_filter_.end()) {
 202       return false;
 203     }
 204     if (!dso_filter_.empty() &&
 205         dso_filter_.find(sample->map->dso->Path()) == dso_filter_.end()) {
 206       return false;
 207     }
 208     if (!symbol_filter_.empty() &&
 209         symbol_filter_.find(sample->symbol->DemangledName()) ==
 210             symbol_filter_.end()) {
 211       return false;
 212     }
 213     return true;
 214   }
 215
 216   void UpdateSummary(const SampleEntry* sample) override {
 217     total_samples_ += sample->sample_count;
 218     total_period_ += sample->period;
 219   }
 220
 221   void MergeSample(SampleEntry* sample1, SampleEntry* sample2) override {
 222     sample1->period += sample2->period;
 223     sample1->accumulated_period += sample2->accumulated_period;
 224     sample1->sample_count += sample2->sample_count;
 225   }
 226
 227  private:
 228   ThreadTree* thread_tree_;
 229
 230   std::unordered_set<int> pid_filter_;
 231   std::unordered_set<int> tid_filter_;
 232   std::unordered_set<std::string> comm_filter_;
 233   std::unordered_set<std::string> dso_filter_;
 234   std::unordered_set<std::string> symbol_filter_;
 235
 236   uint64_t total_samples_;
 237   uint64_t total_period_;
 238 };
 239
 240 using ReportCmdSampleTreeSorter = SampleTreeSorter<SampleEntry>;
 241 using ReportCmdSampleTreeDisplayer =
 242     SampleTreeDisplayer<SampleEntry, SampleTree>;
 243
 244 using ReportCmdCallgraphDisplayer =
 245     CallgraphDisplayer<SampleEntry, CallChainNode<SampleEntry>>;
 246
 247 class ReportCmdCallgraphDisplayerWithVaddrInFile
 248     : public ReportCmdCallgraphDisplayer {
 249  protected:
 250   std::string PrintSampleName(const SampleEntry* sample) override {
 251     return android::base::StringPrintf("%s [+0x%" PRIx64 "]",
 252                                        sample->symbol->DemangledName(),
 253                                        sample->vaddr_in_file);
 254   }
 255 };
 256
 257 struct EventAttrWithName {
 258   perf_event_attr attr;
 259   std::string name;
 260   std::vector<uint64_t> event_ids;
 261 };
 262
 263 class ReportCommand : public Command {
 264  public:
 265   ReportCommand()
 266       : Command(
 267             "report", "report sampling information in perf.data",
 268             // clang-format off
 269 "Usage: simpleperf report [options]\n"
 270 "-b    Use the branch-to addresses in sampled take branches instead of the\n"
 271 "      instruction addresses. Only valid for perf.data recorded with -b/-j\n"
 272 "      option.\n"
 273 "--children    Print the overhead accumulated by appearing in the callchain.\n"
 274 "--comms comm1,comm2,...   Report only for selected comms.\n"
 275 "--dsos dso1,dso2,...      Report only for selected dsos.\n"
 276 "-g [callee|caller]    Print call graph. If callee mode is used, the graph\n"
 277 "                      shows how functions are called from others. Otherwise,\n"
 278 "                      the graph shows how functions call others.\n"
 279 "                      Default is caller mode.\n"
 280 "-i <file>  Specify path of record file, default is perf.data.\n"
 281 "-n         Print the sample count for each item.\n"
 282 "--no-demangle         Don't demangle symbol names.\n"
 283 "--no-show-ip          Don't show vaddr in file for unknown symbols.\n"
 284 "-o report_file_name   Set report file name, default is stdout.\n"
 285 "--pids pid1,pid2,...  Report only for selected pids.\n"
 286 "--sort key1,key2,...  Select keys used to sort and print the report. The\n"
 287 "                      appearance order of keys decides the order of keys used\n"
 288 "                      to sort and print the report.\n"
 289 "                      Possible keys include:\n"
 290 "                        pid             -- process id\n"
 291 "                        tid             -- thread id\n"
 292 "                        comm            -- thread name (can be changed during\n"
 293 "                                           the lifetime of a thread)\n"
 294 "                        dso             -- shared library\n"
 295 "                        symbol          -- function name in the shared library\n"
 296 "                        vaddr_in_file   -- virtual address in the shared\n"
 297 "                                           library\n"
 298 "                      Keys can only be used with -b option:\n"
 299 "                        dso_from        -- shared library branched from\n"
 300 "                        dso_to          -- shared library branched to\n"
 301 "                        symbol_from     -- name of function branched from\n"
 302 "                        symbol_to       -- name of function branched to\n"
 303 "                      The default sort keys are:\n"
 304 "                        comm,pid,tid,dso,symbol\n"
 305 "--symbols symbol1;symbol2;...    Report only for selected symbols.\n"
 306 "--symfs <dir>         Look for files with symbols relative to this directory.\n"
 307 "--tids tid1,tid2,...  Report only for selected tids.\n"
 308 "--vmlinux <file>      Parse kernel symbols from <file>.\n"
 309             // clang-format on
 310             ),
 311         record_filename_("perf.data"),
 312         record_file_arch_(GetBuildArch()),
 313         use_branch_address_(false),
 314         system_wide_collection_(false),
 315         accumulate_callchain_(false),
 316         print_callgraph_(false),
 317         callgraph_show_callee_(false) {}
 318
 319   bool Run(const std::vector<std::string>& args);
 320
 321  private:
 322   bool ParseOptions(const std::vector<std::string>& args);
 323   bool ReadEventAttrFromRecordFile();
 324   bool ReadFeaturesFromRecordFile();
 325   bool ReadSampleTreeFromRecordFile();
 326   bool ProcessRecord(std::unique_ptr<Record> record);
 327   bool ProcessTracingData(const std::vector<char>& data);
 328   bool PrintReport();
 329   void PrintReportContext(FILE* fp);
 330
 331   std::string record_filename_;
 332   ArchType record_file_arch_;
 333   std::unique_ptr<RecordFileReader> record_file_reader_;
 334   std::vector<EventAttrWithName> event_attrs_;
 335   ThreadTree thread_tree_;
 336   SampleTree sample_tree_;
 337   std::unique_ptr<ReportCmdSampleTreeBuilder> sample_tree_builder_;
 338   std::unique_ptr<ReportCmdSampleTreeSorter> sample_tree_sorter_;
 339   std::unique_ptr<ReportCmdSampleTreeDisplayer> sample_tree_displayer_;
 340   bool use_branch_address_;
 341   std::string record_cmdline_;
 342   bool system_wide_collection_;
 343   bool accumulate_callchain_;
 344   bool print_callgraph_;
 345   bool callgraph_show_callee_;
 346
 347   std::string report_filename_;
 348 };
 349
 350 bool ReportCommand::Run(const std::vector<std::string>& args) {
 351   // 1. Parse options.
 352   if (!ParseOptions(args)) {
 353     return false;
 354   }
 355
 356   // 2. Read record file and build SampleTree.
 357   record_file_reader_ = RecordFileReader::CreateInstance(record_filename_);
 358   if (record_file_reader_ == nullptr) {
 359     return false;
 360   }
 361   if (!ReadEventAttrFromRecordFile()) {
 362     return false;
 363   }
 364   // Read features first to prepare build ids used when building SampleTree.
 365   if (!ReadFeaturesFromRecordFile()) {
 366     return false;
 367   }
 368   ScopedCurrentArch scoped_arch(record_file_arch_);
 369   if (!ReadSampleTreeFromRecordFile()) {
 370     return false;
 371   }
 372
 373   // 3. Show collected information.
 374   if (!PrintReport()) {
 375     return false;
 376   }
 377
 378   return true;
 379 }
 380
 381 bool ReportCommand::ParseOptions(const std::vector<std::string>& args) {
 382   bool demangle = true;
 383   bool show_ip_for_unknown_symbol = true;
 384   std::string symfs_dir;
 385   std::string vmlinux;
 386   bool print_sample_count = false;
 387   std::vector<std::string> sort_keys = {"comm", "pid", "tid", "dso", "symbol"};
 388   std::unordered_set<std::string> comm_filter;
 389   std::unordered_set<std::string> dso_filter;
 390   std::unordered_set<std::string> symbol_filter;
 391   std::unordered_set<int> pid_filter;
 392   std::unordered_set<int> tid_filter;
 393
 394   for (size_t i = 0; i < args.size(); ++i) {
 395     if (args[i] == "-b") {
 396       use_branch_address_ = true;
 397     } else if (args[i] == "--children") {
 398       accumulate_callchain_ = true;
 399     } else if (args[i] == "--comms" || args[i] == "--dsos") {
 400       std::unordered_set<std::string>& filter =
 401           (args[i] == "--comms" ? comm_filter : dso_filter);
 402       if (!NextArgumentOrError(args, &i)) {
 403         return false;
 404       }
 405       std::vector<std::string> strs = android::base::Split(args[i], ",");
 406       filter.insert(strs.begin(), strs.end());
 407
 408     } else if (args[i] == "-g") {
 409       print_callgraph_ = true;
 410       accumulate_callchain_ = true;
 411       if (i + 1 < args.size() && args[i + 1][0] != '-') {
 412         ++i;
 413         if (args[i] == "callee") {
 414           callgraph_show_callee_ = true;
 415         } else if (args[i] == "caller") {
 416           callgraph_show_callee_ = false;
 417         } else {
 418           LOG(ERROR) << "Unknown argument with -g option: " << args[i];
 419           return false;
 420         }
 421       }
 422     } else if (args[i] == "-i") {
 423       if (!NextArgumentOrError(args, &i)) {
 424         return false;
 425       }
 426       record_filename_ = args[i];
 427
 428     } else if (args[i] == "-n") {
 429       print_sample_count = true;
 430
 431     } else if (args[i] == "--no-demangle") {
 432       demangle = false;
 433     } else if (args[i] == "--no-show-ip") {
 434       show_ip_for_unknown_symbol = false;
 435     } else if (args[i] == "-o") {
 436       if (!NextArgumentOrError(args, &i)) {
 437         return false;
 438       }
 439       report_filename_ = args[i];
 440
 441     } else if (args[i] == "--pids" || args[i] == "--tids") {
 442       if (!NextArgumentOrError(args, &i)) {
 443         return false;
 444       }
 445       std::vector<std::string> strs = android::base::Split(args[i], ",");
 446       std::vector<int> ids;
 447       for (const auto& s : strs) {
 448         int id;
 449         if (!android::base::ParseInt(s.c_str(), &id, 0)) {
 450           LOG(ERROR) << "invalid id in " << args[i] << " option: " << s;
 451           return false;
 452         }
 453         ids.push_back(id);
 454       }
 455       std::unordered_set<int>& filter =
 456           (args[i] == "--pids" ? pid_filter : tid_filter);
 457       filter.insert(ids.begin(), ids.end());
 458
 459     } else if (args[i] == "--sort") {
 460       if (!NextArgumentOrError(args, &i)) {
 461         return false;
 462       }
 463       sort_keys = android::base::Split(args[i], ",");
 464     } else if (args[i] == "--symbols") {
 465       if (!NextArgumentOrError(args, &i)) {
 466         return false;
 467       }
 468       std::vector<std::string> strs = android::base::Split(args[i], ";");
 469       symbol_filter.insert(strs.begin(), strs.end());
 470     } else if (args[i] == "--symfs") {
 471       if (!NextArgumentOrError(args, &i)) {
 472         return false;
 473       }
 474       symfs_dir = args[i];
 475
 476     } else if (args[i] == "--vmlinux") {
 477       if (!NextArgumentOrError(args, &i)) {
 478         return false;
 479       }
 480       vmlinux = args[i];
 481     } else {
 482       ReportUnknownOption(args, i);
 483       return false;
 484     }
 485   }
 486
 487   Dso::SetDemangle(demangle);
 488   if (!Dso::SetSymFsDir(symfs_dir)) {
 489     return false;
 490   }
 491   if (!vmlinux.empty()) {
 492     Dso::SetVmlinux(vmlinux);
 493   }
 494
 495   if (show_ip_for_unknown_symbol) {
 496     thread_tree_.ShowIpForUnknownSymbol();
 497   }
 498
 499   SampleDisplayer<SampleEntry, SampleTree> displayer;
 500   SampleComparator<SampleEntry> comparator;
 501
 502   if (accumulate_callchain_) {
 503     displayer.AddDisplayFunction("Children", DisplayAccumulatedOverhead);
 504     displayer.AddDisplayFunction("Self", DisplaySelfOverhead);
 505   } else {
 506     displayer.AddDisplayFunction("Overhead", DisplaySelfOverhead);
 507   }
 508   if (print_sample_count) {
 509     displayer.AddDisplayFunction("Sample", DisplaySampleCount);
 510   }
 511
 512   for (auto& key : sort_keys) {
 513     if (!use_branch_address_ &&
 514         branch_sort_keys.find(key) != branch_sort_keys.end()) {
 515       LOG(ERROR) << "sort key '" << key << "' can only be used with -b option.";
 516       return false;
 517     }
 518     if (key == "pid") {
 519       comparator.AddCompareFunction(ComparePid);
 520       displayer.AddDisplayFunction("Pid", DisplayPid);
 521     } else if (key == "tid") {
 522       comparator.AddCompareFunction(CompareTid);
 523       displayer.AddDisplayFunction("Tid", DisplayTid);
 524     } else if (key == "comm") {
 525       comparator.AddCompareFunction(CompareComm);
 526       displayer.AddDisplayFunction("Command", DisplayComm);
 527     } else if (key == "dso") {
 528       comparator.AddCompareFunction(CompareDso);
 529       displayer.AddDisplayFunction("Shared Object", DisplayDso);
 530     } else if (key == "symbol") {
 531       comparator.AddCompareFunction(CompareSymbol);
 532       displayer.AddDisplayFunction("Symbol", DisplaySymbol);
 533     } else if (key == "vaddr_in_file") {
 534       comparator.AddCompareFunction(CompareVaddrInFile);
 535       displayer.AddDisplayFunction("VaddrInFile", DisplayVaddrInFile);
 536     } else if (key == "dso_from") {
 537       comparator.AddCompareFunction(CompareDsoFrom);
 538       displayer.AddDisplayFunction("Source Shared Object", DisplayDsoFrom);
 539     } else if (key == "dso_to") {
 540       comparator.AddCompareFunction(CompareDso);
 541       displayer.AddDisplayFunction("Target Shared Object", DisplayDso);
 542     } else if (key == "symbol_from") {
 543       comparator.AddCompareFunction(CompareSymbolFrom);
 544       displayer.AddDisplayFunction("Source Symbol", DisplaySymbolFrom);
 545     } else if (key == "symbol_to") {
 546       comparator.AddCompareFunction(CompareSymbol);
 547       displayer.AddDisplayFunction("Target Symbol", DisplaySymbol);
 548     } else {
 549       LOG(ERROR) << "Unknown sort key: " << key;
 550       return false;
 551     }
 552   }
 553   if (print_callgraph_) {
 554     bool has_symbol_key = false;
 555     bool has_vaddr_in_file_key = false;
 556     for (const auto& key : sort_keys) {
 557       if (key == "symbol") {
 558         has_symbol_key = true;
 559       } else if (key == "vaddr_in_file") {
 560         has_vaddr_in_file_key = true;
 561       }
 562     }
 563     if (has_symbol_key) {
 564       if (has_vaddr_in_file_key) {
 565         displayer.AddExclusiveDisplayFunction(
 566             ReportCmdCallgraphDisplayerWithVaddrInFile());
 567       } else {
 568         displayer.AddExclusiveDisplayFunction(ReportCmdCallgraphDisplayer());
 569       }
 570     }
 571   }
 572
 573   sample_tree_builder_.reset(
 574       new ReportCmdSampleTreeBuilder(comparator, &thread_tree_));
 575   sample_tree_builder_->SetFilters(pid_filter, tid_filter, comm_filter,
 576                                    dso_filter, symbol_filter);
 577
 578   SampleComparator<SampleEntry> sort_comparator;
 579   sort_comparator.AddCompareFunction(CompareTotalPeriod);
 580   sort_comparator.AddComparator(comparator);
 581   sample_tree_sorter_.reset(new ReportCmdSampleTreeSorter(sort_comparator));
 582   sample_tree_displayer_.reset(new ReportCmdSampleTreeDisplayer(displayer));
 583   return true;
 584 }
 585
 586 bool ReportCommand::ReadEventAttrFromRecordFile() {
 587   std::vector<AttrWithId> attrs = record_file_reader_->AttrSection();
 588   for (const auto& attr_with_id : attrs) {
 589     EventAttrWithName attr;
 590     attr.attr = *attr_with_id.attr;
 591     attr.event_ids = attr_with_id.ids;
 592     attr.name = GetEventNameByAttr(attr.attr);
 593     event_attrs_.push_back(attr);
 594   }
 595   if (use_branch_address_) {
 596     bool has_branch_stack = true;
 597     for (const auto& attr : event_attrs_) {
 598       if ((attr.attr.sample_type & PERF_SAMPLE_BRANCH_STACK) == 0) {
 599         has_branch_stack = false;
 600         break;
 601       }
 602     }
 603     if (!has_branch_stack) {
 604       LOG(ERROR) << record_filename_
 605                  << " is not recorded with branch stack sampling option.";
 606       return false;
 607     }
 608   }
 609   return true;
 610 }
 611
 612 bool ReportCommand::ReadFeaturesFromRecordFile() {
 613   std::vector<BuildIdRecord> records =
 614       record_file_reader_->ReadBuildIdFeature();
 615   std::vector<std::pair<std::string, BuildId>> build_ids;
 616   for (auto& r : records) {
 617     build_ids.push_back(std::make_pair(r.filename, r.build_id));
 618   }
 619   Dso::SetBuildIds(build_ids);
 620
 621   std::string arch =
 622       record_file_reader_->ReadFeatureString(PerfFileFormat::FEAT_ARCH);
 623   if (!arch.empty()) {
 624     record_file_arch_ = GetArchType(arch);
 625     if (record_file_arch_ == ARCH_UNSUPPORTED) {
 626       return false;
 627     }
 628   }
 629
 630   std::vector<std::string> cmdline = record_file_reader_->ReadCmdlineFeature();
 631   if (!cmdline.empty()) {
 632     record_cmdline_ = android::base::Join(cmdline, ' ');
 633     // TODO: the code to detect system wide collection option is fragile, remove
 634     // it once we can do cross unwinding.
 635     for (size_t i = 0; i < cmdline.size(); i++) {
 636       std::string& s = cmdline[i];
 637       if (s == "-a") {
 638         system_wide_collection_ = true;
 639         break;
 640       } else if (s == "--call-graph" || s == "--cpu" || s == "-e" ||
 641                  s == "-f" || s == "-F" || s == "-j" || s == "-m" ||
 642                  s == "-o" || s == "-p" || s == "-t") {
 643         i++;
 644       } else if (!s.empty() && s[0] != '-') {
 645         break;
 646       }
 647     }
 648   }
 649   if (record_file_reader_->HasFeature(PerfFileFormat::FEAT_TRACING_DATA)) {
 650     std::vector<char> tracing_data;
 651     if (!record_file_reader_->ReadFeatureSection(
 652             PerfFileFormat::FEAT_TRACING_DATA, &tracing_data)) {
 653       return false;
 654     }
 655     if (!ProcessTracingData(tracing_data)) {
 656       return false;
 657     }
 658   }
 659   return true;
 660 }
 661
 662 bool ReportCommand::ReadSampleTreeFromRecordFile() {
 663   thread_tree_.AddThread(0, 0, "swapper");
 664   sample_tree_builder_->SetBranchSampleOption(use_branch_address_);
 665   // Normally do strict arch check when unwinding stack. But allow unwinding
 666   // 32-bit processes on 64-bit devices for system wide profiling.
 667   bool strict_unwind_arch_check = !system_wide_collection_;
 668   sample_tree_builder_->SetCallChainSampleOptions(
 669       accumulate_callchain_, print_callgraph_, !callgraph_show_callee_,
 670       strict_unwind_arch_check);
 671   if (!record_file_reader_->ReadDataSection(
 672           [this](std::unique_ptr<Record> record) {
 673             return ProcessRecord(std::move(record));
 674           })) {
 675     return false;
 676   }
 677   sample_tree_ = sample_tree_builder_->GetSampleTree();
 678   sample_tree_sorter_->Sort(sample_tree_.samples, print_callgraph_);
 679   return true;
 680 }
 681
 682 bool ReportCommand::ProcessRecord(std::unique_ptr<Record> record) {
 683   thread_tree_.Update(*record);
 684   if (record->type() == PERF_RECORD_SAMPLE) {
 685     sample_tree_builder_->ProcessSampleRecord(
 686         *static_cast<const SampleRecord*>(record.get()));
 687   } else if (record->type() == PERF_RECORD_TRACING_DATA) {
 688     const auto& r = *static_cast<TracingDataRecord*>(record.get());
 689     if (!ProcessTracingData(std::vector<char>(r.data, r.data + r.data_size))) {
 690       return false;
 691     }
 692   }
 693   return true;
 694 }
 695
 696 bool ReportCommand::ProcessTracingData(const std::vector<char>& data) {
 697   Tracing tracing(data);
 698   for (auto& attr : event_attrs_) {
 699     if (attr.attr.type == PERF_TYPE_TRACEPOINT) {
 700       uint64_t trace_event_id = attr.attr.config;
 701       attr.name = tracing.GetTracingEventNameHavingId(trace_event_id);
 702     }
 703   }
 704   return true;
 705 }
 706
 707 bool ReportCommand::PrintReport() {
 708   std::unique_ptr<FILE, decltype(&fclose)> file_handler(nullptr, fclose);
 709   FILE* report_fp = stdout;
 710   if (!report_filename_.empty()) {
 711     report_fp = fopen(report_filename_.c_str(), "w");
 712     if (report_fp == nullptr) {
 713       PLOG(ERROR) << "failed to open file " << report_filename_;
 714       return false;
 715     }
 716     file_handler.reset(report_fp);
 717   }
 718   PrintReportContext(report_fp);
 719   sample_tree_displayer_->DisplaySamples(report_fp, sample_tree_.samples,
 720                                          &sample_tree_);
 721   fflush(report_fp);
 722   if (ferror(report_fp) != 0) {
 723     PLOG(ERROR) << "print report failed";
 724     return false;
 725   }
 726   return true;
 727 }
 728
 729 void ReportCommand::PrintReportContext(FILE* report_fp) {
 730   if (!record_cmdline_.empty()) {
 731     fprintf(report_fp, "Cmdline: %s\n", record_cmdline_.c_str());
 732   }
 733   fprintf(report_fp, "Arch: %s\n", GetArchString(record_file_arch_).c_str());
 734   for (const auto& attr : event_attrs_) {
 735     fprintf(report_fp, "Event: %s (type %u, config %llu)\n", attr.name.c_str(),
 736             attr.attr.type, attr.attr.config);
 737   }
 738   fprintf(report_fp, "Samples: %" PRIu64 "\n", sample_tree_.total_samples);
 739   fprintf(report_fp, "Event count: %" PRIu64 "\n\n", sample_tree_.total_period);
 740 }
 741
 742 }  // namespace
 743
 744 void RegisterReportCommand() {
 745   RegisterCommand("report",
 746                   [] { return std::unique_ptr<Command>(new ReportCommand()); });
 747 }