base/trace_event/process_memory_maps_dump_provider.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/trace_event/process_memory_maps_dump_provider.h"
   6
   7 #include <fstream>
   8
   9 #include "base/logging.h"
  10 #include "base/process/process_metrics.h"
  11 #include "base/trace_event/process_memory_dump.h"
  12 #include "base/trace_event/process_memory_maps.h"
  13
  14 namespace base {
  15 namespace trace_event {
  16
  17 #if defined(OS_LINUX) || defined(OS_ANDROID)
  18 // static
  19 std::istream* ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = nullptr;
  20
  21 namespace {
  22 uint32 ReadLinuxProcSmapsFile(std::istream* smaps, ProcessMemoryMaps* pmm) {
  23   if (!smaps->good()) {
  24     LOG(ERROR) << "Could not read smaps file.";
  25     return 0;
  26   }
  27   uint32 num_regions_processed = 0;
  28   // TODO(primiano): in next CLs add the actual code to process the smaps file.
  29   return num_regions_processed;
  30 }
  31 }  // namespace
  32 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)
  33
  34 // static
  35 ProcessMemoryMapsDumpProvider* ProcessMemoryMapsDumpProvider::GetInstance() {
  36   return Singleton<ProcessMemoryMapsDumpProvider,
  37                    LeakySingletonTraits<ProcessMemoryMapsDumpProvider>>::get();
  38 }
  39
  40 ProcessMemoryMapsDumpProvider::ProcessMemoryMapsDumpProvider() {
  41 }
  42
  43 ProcessMemoryMapsDumpProvider::~ProcessMemoryMapsDumpProvider() {
  44 }
  45
  46 // Called at trace dump point time. Creates a snapshot the memory maps for the
  47 // current process.
  48 void ProcessMemoryMapsDumpProvider::DumpInto(ProcessMemoryDump* pmd) {
  49   uint32 res = 0;
  50
  51 #if defined(OS_LINUX) || defined(OS_ANDROID)
  52   if (UNLIKELY(proc_smaps_for_testing)) {
  53     res = ReadLinuxProcSmapsFile(proc_smaps_for_testing, pmd->process_mmaps());
  54   } else {
  55     std::ifstream proc_self_smaps("/proc/self/smaps");
  56     res = ReadLinuxProcSmapsFile(&proc_self_smaps, pmd->process_mmaps());
  57   }
  58 #else
  59   LOG(ERROR) << "ProcessMemoryMaps dump provider is supported only on Linux";
  60 #endif
  61
  62   if (res > 0)
  63     pmd->set_has_process_mmaps();
  64 }
  65
  66 }  // namespace trace_event
  67 }  // namespace base