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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 "components/tracing/core/proto_zero_message.h" | 5 #include "components/tracing/core/proto_zero_message.h" |
6 | 6 |
7 #include <string.h> | 7 #include <string.h> |
8 | 8 |
9 #include "components/tracing/core/proto_zero_message_handle.h" | 9 #include "components/tracing/core/proto_zero_message_handle.h" |
10 | 10 |
11 #if !defined(ARCH_CPU_LITTLE_ENDIAN) | 11 #if !defined(ARCH_CPU_LITTLE_ENDIAN) |
12 // The memcpy() for float and double below needs to be adjusted if we want to | 12 // The memcpy() for float and double below needs to be adjusted if we want to |
13 // support big endian CPUs. There doesn't seem to be a compelling need today. | 13 // support big endian CPUs. There doesn't seem to be a compelling need today. |
14 #error big-endian CPUs not supported by this translation unit. | 14 #error big-endian CPUs not supported by this translation unit. |
15 #endif | 15 #endif |
16 | 16 |
17 namespace tracing { | 17 namespace tracing { |
18 namespace v2 { | 18 namespace v2 { |
19 | 19 |
20 ProtoZeroMessage::ProtoZeroMessage() { | 20 ProtoZeroMessage::ProtoZeroMessage() { |
21 // Do NOT add any code here, use the Reset() method below instead. | 21 // Do NOT add any code here, use the Reset() method below instead. |
22 // Ctor and Dtor of ProtoZeroMessage are never called, with the exeception | 22 // Ctor and Dtor of ProtoZeroMessage are never called, with the exeception |
23 // of root (non-nested) messages. Nested messages are allocated in the | 23 // of root (non-nested) messages. Nested messages are allocated in the |
24 // |nested_messages_arena_| and implictly destroyed when the arena of the | 24 // |nested_messages_arena_| and implictly destroyed when the arena of the |
25 // root message goes away. This is fine as long as all the fields are PODs, | 25 // root message goes away. This is fine as long as all the fields are PODs, |
26 // hence the static_assert below. | 26 // hence the static_assert below. |
27 static_assert(base::is_trivially_destructible<ProtoZeroMessage>::value, | 27 static_assert(std::is_trivially_destructible<ProtoZeroMessage>::value, |
28 "ProtoZeroMessage must be trivially destructible"); | 28 "ProtoZeroMessage must be trivially destructible"); |
29 | 29 |
30 static_assert( | 30 static_assert( |
31 sizeof(ProtoZeroMessage::nested_messages_arena_) >= | 31 sizeof(ProtoZeroMessage::nested_messages_arena_) >= |
32 kMaxNestingDepth * (sizeof(ProtoZeroMessage) - | 32 kMaxNestingDepth * (sizeof(ProtoZeroMessage) - |
33 sizeof(ProtoZeroMessage::nested_messages_arena_)), | 33 sizeof(ProtoZeroMessage::nested_messages_arena_)), |
34 "ProtoZeroMessage::nested_messages_arena_ is too small"); | 34 "ProtoZeroMessage::nested_messages_arena_ is too small"); |
35 } | 35 } |
36 | 36 |
37 // This method is called to initialize both root and nested messages. | 37 // This method is called to initialize both root and nested messages. |
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120 nested_message_ = message; | 120 nested_message_ = message; |
121 } | 121 } |
122 | 122 |
123 void ProtoZeroMessage::EndNestedMessage() { | 123 void ProtoZeroMessage::EndNestedMessage() { |
124 size_ += nested_message_->Finalize(); | 124 size_ += nested_message_->Finalize(); |
125 nested_message_ = nullptr; | 125 nested_message_ = nullptr; |
126 } | 126 } |
127 | 127 |
128 } // namespace v2 | 128 } // namespace v2 |
129 } // namespace tracing | 129 } // namespace tracing |
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