Move base to DEPS

base/trace_event/process_memory_maps_dump_provider.cc

-// 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 "base/trace_event/process_memory_maps_dump_provider.h"
-
-#include <cctype>
-#include <fstream>
-
-#include "base/logging.h"
-#include "base/process/process_metrics.h"
-#include "base/trace_event/process_memory_dump.h"
-#include "base/trace_event/process_memory_maps.h"
-
-namespace base {
-namespace trace_event {
-
-#if defined(OS_LINUX) || defined(OS_ANDROID)
-// static
-std::istream* ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = nullptr;
-
-namespace {
-
-const uint32 kMaxLineSize = 4096;
-
-bool ParseSmapsHeader(std::istream* smaps,
-                      ProcessMemoryMaps::VMRegion* region) {
-  // e.g., "00400000-00421000 r-xp 00000000 fc:01 1234  /foo.so\n"
-  bool res = true;  // Whether this region should be appended or skipped.
-  uint64 end_addr;
-  std::string protection_flags;
-  std::string ignored;
-  *smaps >> std::hex >> region->start_address;
-  smaps->ignore(1);
-  *smaps >> std::hex >> end_addr;
-  if (end_addr > region->start_address) {
-    region->size_in_bytes = end_addr - region->start_address;
-  } else {
-    // This is not just paranoia, it can actually happen (See crbug.com/461237).
-    region->size_in_bytes = 0;
-    res = false;
-  }
-
-  region->protection_flags = 0;
-  *smaps >> protection_flags;
-  CHECK_EQ(4UL, protection_flags.size());
-  if (protection_flags[0] == 'r') {
-    region->protection_flags |=
-        ProcessMemoryMaps::VMRegion::kProtectionFlagsRead;
-  }
-  if (protection_flags[1] == 'w') {
-    region->protection_flags |=
-        ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite;
-  }
-  if (protection_flags[2] == 'x') {
-    region->protection_flags |=
-        ProcessMemoryMaps::VMRegion::kProtectionFlagsExec;
-  }
-  *smaps >> ignored;  // Ignore mapped file offset.
-  *smaps >> ignored;  // Ignore device maj-min (fc:01 in the example above).
-  *smaps >> ignored;  // Ignore inode number (1234 in the example above).
-
-  while (smaps->peek() == ' ')
-    smaps->ignore(1);
-  char mapped_file[kMaxLineSize];
-  smaps->getline(mapped_file, sizeof(mapped_file));
-  region->mapped_file = mapped_file;
-
-  return res;
-}
-
-uint64 ReadCounterBytes(std::istream* smaps) {
-  uint64 counter_value = 0;
-  *smaps >> std::dec >> counter_value;
-  return counter_value * 1024;
-}
-
-uint32 ParseSmapsCounter(std::istream* smaps,
-                         ProcessMemoryMaps::VMRegion* region) {
-  // A smaps counter lines looks as follows: "RSS:  0 Kb\n"
-  uint32 res = 1;
-  std::string counter_name;
-  *smaps >> counter_name;
-
-  // TODO(primiano): "Swap" should also be accounted as resident. Check
-  // whether Rss isn't already counting swapped and fix below if that is
-  // the case.
-  if (counter_name == "Pss:") {
-    region->byte_stats_proportional_resident = ReadCounterBytes(smaps);
-  } else if (counter_name == "Private_Dirty:") {
-    region->byte_stats_private_dirty_resident = ReadCounterBytes(smaps);
-  } else if (counter_name == "Private_Clean:") {
-    region->byte_stats_private_clean_resident = ReadCounterBytes(smaps);
-  } else if (counter_name == "Shared_Dirty:") {
-    region->byte_stats_shared_dirty_resident = ReadCounterBytes(smaps);
-  } else if (counter_name == "Shared_Clean:") {
-    region->byte_stats_shared_clean_resident = ReadCounterBytes(smaps);
-  } else if (counter_name == "Swap:") {
-    region->byte_stats_swapped = ReadCounterBytes(smaps);
-  } else {
-    res = 0;
-  }
-
-#ifndef NDEBUG
-  // Paranoid check against changes of the Kernel /proc interface.
-  if (res) {
-    std::string unit;
-    *smaps >> unit;
-    DCHECK_EQ("kB", unit);
-  }
-#endif
-
-  smaps->ignore(kMaxLineSize, '\n');
-
-  return res;
-}
-
-uint32 ReadLinuxProcSmapsFile(std::istream* smaps, ProcessMemoryMaps* pmm) {
-  if (!smaps->good())
-    return 0;
-
-  const uint32 kNumExpectedCountersPerRegion = 6;
-  uint32 counters_parsed_for_current_region = 0;
-  uint32 num_valid_regions = 0;
-  ProcessMemoryMaps::VMRegion region;
-  bool should_add_current_region = false;
-  for (;;) {
-    int next = smaps->peek();
-    if (next == std::ifstream::traits_type::eof() || next == '\n')
-      break;
-    if (isxdigit(next) && !isupper(next)) {
-      region = ProcessMemoryMaps::VMRegion();
-      counters_parsed_for_current_region = 0;
-      should_add_current_region = ParseSmapsHeader(smaps, &region);
-    } else {
-      counters_parsed_for_current_region += ParseSmapsCounter(smaps, &region);
-      DCHECK_LE(counters_parsed_for_current_region,
-                kNumExpectedCountersPerRegion);
-      if (counters_parsed_for_current_region == kNumExpectedCountersPerRegion) {
-        if (should_add_current_region) {
-          pmm->AddVMRegion(region);
-          ++num_valid_regions;
-          should_add_current_region = false;
-        }
-      }
-    }
-  }
-  return num_valid_regions;
-}
-
-}  // namespace
-#endif  // defined(OS_LINUX) || defined(OS_ANDROID)
-
-// static
-ProcessMemoryMapsDumpProvider* ProcessMemoryMapsDumpProvider::GetInstance() {
-  return Singleton<ProcessMemoryMapsDumpProvider,
-                   LeakySingletonTraits<ProcessMemoryMapsDumpProvider>>::get();
-}
-
-ProcessMemoryMapsDumpProvider::ProcessMemoryMapsDumpProvider() {
-}
-
-ProcessMemoryMapsDumpProvider::~ProcessMemoryMapsDumpProvider() {
-}
-
-// Called at trace dump point time. Creates a snapshot the memory maps for the
-// current process.
-bool ProcessMemoryMapsDumpProvider::OnMemoryDump(ProcessMemoryDump* pmd) {
-  uint32 res = 0;
-
-#if defined(OS_LINUX) || defined(OS_ANDROID)
-  if (UNLIKELY(proc_smaps_for_testing)) {
-    res = ReadLinuxProcSmapsFile(proc_smaps_for_testing, pmd->process_mmaps());
-  } else {
-    std::ifstream proc_self_smaps("/proc/self/smaps");
-    res = ReadLinuxProcSmapsFile(&proc_self_smaps, pmd->process_mmaps());
-  }
-#else
-  LOG(ERROR) << "ProcessMemoryMaps dump provider is supported only on Linux";
-#endif
-
-  if (res > 0) {
-    pmd->set_has_process_mmaps();
-    return true;
-  }
-
-  return false;
-}
-
-}  // namespace trace_event
-}  // namespace base