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Side by Side Diff: base/trace_event/memory_allocator_dump_guid.h

Issue 1173263004: [tracing] Send unique tracing process id for cross-process memory dumps identification. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase. Created 5 years, 6 months ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved. 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 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 #ifndef BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_ 5 #ifndef BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
6 #define BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_ 6 #define BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
7 7
8 #include <string> 8 #include <string>
9 9
10 #include "base/base_export.h" 10 #include "base/base_export.h"
11 #include "base/basictypes.h" 11 #include "base/basictypes.h"
12 12
13 namespace base { 13 namespace base {
14 namespace trace_event { 14 namespace trace_event {
15 15
16 class BASE_EXPORT MemoryAllocatorDumpGuid { 16 class BASE_EXPORT MemoryAllocatorDumpGuid {
17 public: 17 public:
18 static const int kInvalidChildProcessId = -1;
19
18 MemoryAllocatorDumpGuid(); 20 MemoryAllocatorDumpGuid();
19 explicit MemoryAllocatorDumpGuid(uint64 guid); 21 explicit MemoryAllocatorDumpGuid(uint64 guid);
20 22
21 // Utility ctor to hash a GUID if the caller prefers a string. The caller 23 // Utility ctor to hash a GUID if the caller prefers a string. The caller
22 // still has to ensure that |guid_str| is unique, per snapshot, within the 24 // can insert "$$" in the string and it will be replaced by the unique child
23 // global scope of all the traced processes. 25 // process id for creating cross-process unique guid. Otherwise the caller
26 // has to ensure that |guid_str| is unique, per snapshot, within the global
27 // scope of all the traced processes.
28 // NOTE: In single process mode or when tracing is not enabled the "$$" does
29 // not get replaced and the caller has to set the id.
24 explicit MemoryAllocatorDumpGuid(const std::string& guid_str); 30 explicit MemoryAllocatorDumpGuid(const std::string& guid_str);
25 31
32 // Sets the unique id of the child process for creating cross process unique
33 // guids. Pass kInvalidChildProcessId for invalidating the id.
34 static void SetUniqueChildProcessId(int child_process_id);
35
26 uint64 ToUint64() const { return guid_; } 36 uint64 ToUint64() const { return guid_; }
27 37
28 // Returns a (hex-encoded) string representation of the guid. 38 // Returns a (hex-encoded) string representation of the guid.
29 std::string ToString() const; 39 std::string ToString() const;
30 40
31 bool empty() const { return guid_ == 0u; } 41 bool empty() const { return guid_ == 0u; }
32 42
33 bool operator==(const MemoryAllocatorDumpGuid& other) const { 43 bool operator==(const MemoryAllocatorDumpGuid& other) const {
34 return guid_ == other.guid_; 44 return guid_ == other.guid_;
35 } 45 }
36 46
37 bool operator!=(const MemoryAllocatorDumpGuid& other) const { 47 bool operator!=(const MemoryAllocatorDumpGuid& other) const {
38 return !(*this == other); 48 return !(*this == other);
39 } 49 }
40 50
41 private: 51 private:
42 uint64 guid_; 52 uint64 guid_;
43 53
44 // Deliberately copy-able. 54 // Deliberately copy-able.
45 }; 55 };
46 56
47 } // namespace trace_event 57 } // namespace trace_event
48 } // namespace base 58 } // namespace base
49 59
50 #endif // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_ 60 #endif // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
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