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