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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/metrics/field_trial.h" | 5 #include "base/metrics/field_trial.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 #include <utility> | 8 #include <utility> |
9 | 9 |
10 #include "base/base_switches.h" | |
10 #include "base/build_time.h" | 11 #include "base/build_time.h" |
12 #include "base/command_line.h" | |
13 #include "base/feature_list.h" | |
11 #include "base/logging.h" | 14 #include "base/logging.h" |
12 #include "base/rand_util.h" | 15 #include "base/rand_util.h" |
13 #include "base/strings/string_number_conversions.h" | 16 #include "base/strings/string_number_conversions.h" |
14 #include "base/strings/string_util.h" | 17 #include "base/strings/string_util.h" |
15 #include "base/strings/stringprintf.h" | 18 #include "base/strings/stringprintf.h" |
16 #include "base/strings/utf_string_conversions.h" | 19 #include "base/strings/utf_string_conversions.h" |
17 | 20 |
18 namespace base { | 21 namespace base { |
19 | 22 |
20 namespace { | 23 namespace { |
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551 // Call |group()| to mark the trial as "used" and notify observers, if | 554 // Call |group()| to mark the trial as "used" and notify observers, if |
552 // any. This is useful to ensure that field trials created in child | 555 // any. This is useful to ensure that field trials created in child |
553 // processes are properly reported in crash reports. | 556 // processes are properly reported in crash reports. |
554 trial->group(); | 557 trial->group(); |
555 } | 558 } |
556 } | 559 } |
557 return true; | 560 return true; |
558 } | 561 } |
559 | 562 |
560 // static | 563 // static |
564 void FieldTrialList::CreateTrialsFromCommandLine( | |
565 const base::CommandLine cmd_line, | |
566 const char* field_trial_handle_switch) { | |
567 DCHECK(global_); | |
568 | |
569 if (cmd_line.HasSwitch(field_trial_handle_switch)) { | |
570 #if defined(OS_WIN) | |
Alexei Svitkine (slow)
2016/10/06 13:45:30
Ifdef should be around the if.
lawrencewu
2016/10/06 20:14:57
Done.
| |
571 std::string arg = cmd_line.GetSwitchValueASCII(field_trial_handle_switch); | |
572 size_t token = arg.find(","); | |
573 int field_trial_handle = std::stoi(arg.substr(0, token)); | |
574 int field_trial_length = std::stoi(arg.substr(token + 1, arg.length())); | |
575 | |
576 HANDLE handle = reinterpret_cast<HANDLE>(field_trial_handle); | |
577 base::SharedMemoryHandle shm_handle = | |
578 base::SharedMemoryHandle(handle, base::GetCurrentProcId()); | |
579 | |
580 base::SharedMemory shared_memory(shm_handle, false); | |
581 shared_memory.Map(field_trial_length); | |
582 | |
583 char* field_trial_state = static_cast<char*>(shared_memory.memory()); | |
584 bool result = FieldTrialList::CreateTrialsFromString( | |
585 std::string(field_trial_state), std::set<std::string>()); | |
586 DCHECK(result); | |
587 #endif | |
588 } | |
Alexei Svitkine (slow)
2016/10/06 13:45:30
Add a return statement to the block above.
lawrencewu
2016/10/06 20:14:57
Done.
| |
589 | |
590 if (cmd_line.HasSwitch(switches::kForceFieldTrials)) { | |
591 bool result = FieldTrialList::CreateTrialsFromString( | |
592 cmd_line.GetSwitchValueASCII(switches::kForceFieldTrials), | |
593 std::set<std::string>()); | |
594 DCHECK(result); | |
595 } | |
596 } | |
597 | |
598 // static | |
599 std::unique_ptr<base::SharedMemory> | |
600 FieldTrialList::CopyFieldTrialStateToSharedMemory( | |
601 base::CommandLine* cmd_line, | |
Alexei Svitkine (slow)
2016/10/06 13:45:30
Non-const params should be last.
lawrencewu
2016/10/06 20:14:57
Done.
| |
602 const char* field_trial_handle_switch) { | |
603 std::string field_trial_states; | |
604 FieldTrialList::AllStatesToString(&field_trial_states); | |
605 if (!field_trial_states.empty()) { | |
606 #if defined(OS_WIN) | |
607 std::unique_ptr<base::SharedMemory> shm(new base::SharedMemory()); | |
608 size_t length = field_trial_states.size() + 1; | |
609 shm->CreateAndMapAnonymous(length); | |
610 memcpy(shm->memory(), field_trial_states.c_str(), length); | |
611 | |
612 // HANDLE is just typedef'd to void * | |
613 auto uintptr_handle = | |
614 reinterpret_cast<std::uintptr_t>(shm->handle().GetHandle()); | |
615 std::string field_trial_handle = | |
616 std::to_string(uintptr_handle) + "," + std::to_string(length); | |
617 | |
618 cmd_line->AppendSwitchASCII(field_trial_handle_switch, field_trial_handle); | |
619 return shm; | |
620 #else | |
621 return std::unique_ptr<base::SharedMemory>(nullptr); | |
622 #endif | |
623 } else { | |
624 return std::unique_ptr<base::SharedMemory>(nullptr); | |
625 } | |
626 } | |
627 | |
628 // static | |
561 FieldTrial* FieldTrialList::CreateFieldTrial( | 629 FieldTrial* FieldTrialList::CreateFieldTrial( |
562 const std::string& name, | 630 const std::string& name, |
563 const std::string& group_name) { | 631 const std::string& group_name) { |
564 DCHECK(global_); | 632 DCHECK(global_); |
565 DCHECK_GE(name.size(), 0u); | 633 DCHECK_GE(name.size(), 0u); |
566 DCHECK_GE(group_name.size(), 0u); | 634 DCHECK_GE(group_name.size(), 0u); |
567 if (name.empty() || group_name.empty() || !global_) | 635 if (name.empty() || group_name.empty() || !global_) |
568 return NULL; | 636 return NULL; |
569 | 637 |
570 FieldTrial* field_trial = FieldTrialList::Find(name); | 638 FieldTrial* field_trial = FieldTrialList::Find(name); |
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650 return; | 718 return; |
651 } | 719 } |
652 AutoLock auto_lock(global_->lock_); | 720 AutoLock auto_lock(global_->lock_); |
653 CHECK(!global_->PreLockedFind(trial->trial_name())) << trial->trial_name(); | 721 CHECK(!global_->PreLockedFind(trial->trial_name())) << trial->trial_name(); |
654 trial->AddRef(); | 722 trial->AddRef(); |
655 trial->SetTrialRegistered(); | 723 trial->SetTrialRegistered(); |
656 global_->registered_[trial->trial_name()] = trial; | 724 global_->registered_[trial->trial_name()] = trial; |
657 } | 725 } |
658 | 726 |
659 } // namespace base | 727 } // namespace base |
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