Normalizing source file names before calculating hash

chrome/browser/metrics/metrics_log.cc

 // Copyright (c) 2012 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 "chrome/browser/metrics/metrics_log.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 255 matching lines @@
   while (i > 0 && isdigit(thread_name[i - 1])) {
     --i;
   }
 
   if (i == thread_name.length())
     return thread_name;
 
   return thread_name.substr(0, i) + '*';
 }
 
+// Normalizes a source filename (which is platform- and build-method-dependent)
+// by extracting the last component of the full file name.
+// Example: "c:\b\build\slave\win\build\src\chrome\app\chrome_main.cc" =>
+// "chrome_main.cc".
+std::string NormalizeFileName(const std::string& file_name) {
+  const size_t offset = file_name.find_last_of("\\/");
+  return offset != std::string::npos ? file_name.substr(offset + 1) : file_name;
+}
+
 void WriteProfilerData(const ProcessDataSnapshot& profiler_data,
                        int process_type,
                        ProfilerEventProto* performance_profile) {
   for (std::vector<tracked_objects::TaskSnapshot>::const_iterator it =
            profiler_data.tasks.begin();
        it != profiler_data.tasks.end(); ++it) {
     const tracked_objects::DeathDataSnapshot& death_data = it->death_data;
     ProfilerEventProto::TrackedObject* tracked_object =
         performance_profile->add_tracked_object();
     tracked_object->set_birth_thread_name_hash(
         MetricsLogBase::Hash(MapThreadName(it->birth.thread_name)));
     tracked_object->set_exec_thread_name_hash(
         MetricsLogBase::Hash(MapThreadName(it->death_thread_name)));
     tracked_object->set_source_file_name_hash(
-        MetricsLogBase::Hash(it->birth.location.file_name));
+        MetricsLogBase::Hash(NormalizeFileName(it->birth.location.file_name)));
     tracked_object->set_source_function_name_hash(
         MetricsLogBase::Hash(it->birth.location.function_name));
     tracked_object->set_source_line_number(it->birth.location.line_number);
     tracked_object->set_exec_count(death_data.count);
     tracked_object->set_exec_time_total(death_data.run_duration_sum);
     tracked_object->set_exec_time_sampled(death_data.run_duration_sample);
     tracked_object->set_queue_time_total(death_data.queue_duration_sum);
     tracked_object->set_queue_time_sampled(death_data.queue_duration_sample);
     tracked_object->set_process_type(AsProtobufProcessType(process_type));
     tracked_object->set_process_id(profiler_data.process_id);
@@ skipping 591 matching lines @@
     ProductDataToProto(google_update_metrics.google_update_data,
                        google_update->mutable_google_update_status());
   }
 
   if (!google_update_metrics.product_data.version.empty()) {
     ProductDataToProto(google_update_metrics.product_data,
                        google_update->mutable_client_status());
   }
 #endif  // defined(GOOGLE_CHROME_BUILD) && defined(OS_WIN)
 }