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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 #ifndef BASE_PROFILER_CPU_PROFILER_H_ | |
6 #define BASE_PROFILER_CPU_PROFILER_H_ | |
7 | |
8 #include <map> | |
9 | |
10 #include "base/base_export.h" | |
11 #include "base/memory/scoped_ptr.h" | |
12 #include "base/strings/string16.h" | |
13 #include "base/synchronization/waitable_event.h" | |
14 #include "base/timer/timer.h" | |
15 | |
16 namespace base { | |
17 | |
18 #if defined(OS_WIN) | |
19 struct StackTraceEntry { | |
20 DWORD64 rsp; | |
21 DWORD64 rip; | |
22 HMODULE module; | |
23 }; | |
24 #endif | |
25 | |
26 // CpuProfiler is a prototype of a technique that periodically stops the main | |
27 // thread to samples its stack. It does not do anything useful with the | |
28 // collected information yet; this implementation is for the purposes of | |
29 // determining perf impact of the profiler itself. | |
30 // | |
31 // Currently, this is intended to sample the main thread. It should be allocated | |
32 // on that thread, then Initialize should be called to start the sampling, and | |
33 // Stop called to stop the sampling. | |
34 class BASE_EXPORT CpuProfiler { | |
35 public: | |
36 CpuProfiler(); | |
37 ~CpuProfiler(); | |
38 | |
39 void Initialize(const std::map<std::string, std::string>* params); | |
40 void Stop(); | |
41 | |
42 std::string GetStringParam(const std::string& key) const; | |
43 int GetIntParam(const std::string& key) const; | |
44 int64 GetInt64Param(const std::string& key) const; | |
45 | |
46 private: | |
47 class SamplingThread; | |
48 struct SamplingThreadDeleter { | |
49 void operator() (SamplingThread* thread) const; | |
50 }; | |
51 | |
52 static bool IsPlatformSupported(); | |
53 | |
54 void SetParams(const std::map<std::string, std::string>& params); | |
55 | |
56 void OnTimer(); | |
57 | |
58 #if defined(OS_WIN) | |
59 void ProcessStack(StackTraceEntry* stack, int stack_depth); | |
60 | |
61 HANDLE main_thread_; | |
62 int main_thread_stack_depth_; | |
63 StackTraceEntry main_thread_stack_[64]; | |
64 | |
65 std::map<HMODULE, base::string16> modules_; | |
66 #endif | |
67 | |
68 std::map<std::string, std::string> params_; | |
69 | |
70 scoped_ptr<SamplingThread, SamplingThreadDeleter> sampling_thread_; | |
71 PlatformThreadHandle sampling_thread_handle_; | |
72 | |
73 DISALLOW_COPY_AND_ASSIGN(CpuProfiler); | |
74 }; | |
75 | |
76 } // namespace base | |
77 | |
78 #endif // BASE_PROFILER_CPU_PROFILER_H_ | |
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