Method CollectTimingData

Source/cmInstrumentation.cxx:349–442

}

int cmInstrumentation::CollectTimingData(cmInstrumentationQuery::Hook hook)
{
  // Don't run collection if hook is disabled
  if (hook != cmInstrumentationQuery::Hook::Manual && !this->HasHook(hook)) {
    return 0;
  }

  this->LockIndexing();

  // Touch index file immediately to claim snippets
  std::string suffix_time = ComputeSuffixTime();
  std::string const& index_name = cmStrCat("index-", suffix_time, ".json");
  std::string index_path = cmStrCat(this->dataDir, "/index/", index_name);
  cmSystemTools::Touch(index_path, true);

  // Gather Snippets
  using snippet = std::pair<std::string, std::string>;
  std::vector<snippet> files;
  cmsys::Directory d;
  std::string last_index_name =
    this->GetFileByTimestamp(LatestOrOldest::Latest, "index", index_name);
  std::string last_index_path =
    cmStrCat(this->dataDir, "/index/", last_index_name);
  if (d.Load(this->dataDir)) {
    for (unsigned int i = 0; i < d.GetNumberOfFiles(); i++) {
      std::string fpath = d.GetFilePath(i);
      std::string fname = d.GetFile(i);
      if (fname.rfind('.', 0) == 0 || d.FileIsDirectory(i)) {
        continue;
      }
      files.push_back(snippet(std::move(fname), std::move(fpath)));
    }
  }

  // Build Json Object
  Json::Value index(Json::objectValue);
  index["snippets"] = Json::arrayValue;
  index["hook"] = cmInstrumentationQuery::HookString[hook];
  index["dataDir"] = this->dataDir;
  index["buildDir"] = this->binaryDir;
  if (this->HasOption(
        cmInstrumentationQuery::Option::StaticSystemInformation)) {
    this->InsertStaticSystemInformation(index);
  }

  for (auto const& file : files) {
    if (last_index_name.empty()) {
      index["snippets"].append(file.first);
    } else {
      int compare;
      cmSystemTools::FileTimeCompare(file.second, last_index_path, &compare);
      if (compare == 1) {
        index["snippets"].append(file.first);
      }
    }
  }

  // Parse snippets into the Google trace file