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1 // Copyright 2014 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 MOJO_PUBLIC_BINDINGS_LIB_SCRATCH_BUFFER_H_ | |
6 #define MOJO_PUBLIC_BINDINGS_LIB_SCRATCH_BUFFER_H_ | |
7 | |
8 #include <deque> | |
9 | |
10 #include "mojo/public/cpp/bindings/buffer.h" | |
11 #include "mojo/public/cpp/system/macros.h" | |
12 | |
13 namespace mojo { | |
14 namespace internal { | |
15 | |
16 // The following class is designed to be allocated on the stack. If necessary, | |
17 // it will failover to allocating objects on the heap. | |
18 class ScratchBuffer : public Buffer { | |
19 public: | |
20 ScratchBuffer(); | |
21 virtual ~ScratchBuffer(); | |
22 | |
23 virtual void* Allocate(size_t num_bytes, Destructor func = NULL) | |
24 MOJO_OVERRIDE; | |
25 | |
26 private: | |
27 enum { kMinSegmentSize = 512 }; | |
28 | |
29 struct Segment { | |
30 Segment* next; | |
31 char* cursor; | |
32 char* end; | |
33 }; | |
34 | |
35 void* AllocateInSegment(Segment* segment, size_t num_bytes); | |
36 void AddOverflowSegment(size_t delta); | |
37 | |
38 char fixed_data_[kMinSegmentSize]; | |
39 Segment fixed_; | |
40 Segment* overflow_; | |
41 | |
42 struct PendingDestructor { | |
43 Destructor func; | |
44 void* address; | |
45 }; | |
46 std::deque<PendingDestructor> pending_dtors_; | |
47 | |
48 MOJO_DISALLOW_COPY_AND_ASSIGN(ScratchBuffer); | |
49 }; | |
50 | |
51 } // namespace internal | |
52 } // namespace mojo | |
53 | |
54 #endif // MOJO_PUBLIC_BINDINGS_LIB_SCRATCH_BUFFER_H_ | |
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