projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| 14957cd0 A |
1 | /* |
| 2 | * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies) | |
| 3 | * | |
| 4 | * Redistribution and use in source and binary forms, with or without | |
| 5 | * modification, are permitted provided that the following conditions | |
| 6 | * are met: | |
| 7 | * | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
| 14 | * its contributors may be used to endorse or promote products derived | |
| 15 | * from this software without specific prior written permission. | |
| 16 | * | |
| 17 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
| 18 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 20 | * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
| 21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 22 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 23 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
| 24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 | */ | |
| 28 | ||
| 29 | #ifndef PageAllocatorSymbian_h | |
| 30 | #define PageAllocatorSymbian_h | |
| 31 | ||
| 32 | #include <e32std.h> | |
| 33 | #include <wtf/Bitmap.h> | |
| 34 | ||
| 35 | namespace WTF { | |
| 36 | ||
| 37 | size_t pageSize(); | |
| 38 | ||
| 39 | // Convenience wrapper around an RChunk | |
| 40 | class SymbianChunk : public RChunk { | |
| 41 | ||
| 42 | public: | |
| 43 | SymbianChunk(TInt handle) | |
| 44 | { | |
| 45 | SetHandle(handle); | |
| 46 | // prevent kernel calls by caching these | |
| 47 | m_base = reinterpret_cast<char*>(Base()); | |
| 48 | m_maxSize = MaxSize(); | |
| 49 | } | |
| 50 | ||
| 51 | ~SymbianChunk() | |
| 52 | { | |
| 53 | Decommit(0, m_maxSize); | |
| 54 | Close(); | |
| 55 | } | |
| 56 | ||
| 57 | // checks if address is in chunk's virtual address space | |
| 58 | bool contains(const void* address) const | |
| 59 | { | |
| 60 | return (static_cast<const char*>(address) >= m_base && static_cast<const char*>(address) < (m_base + m_maxSize)); | |
| 61 | } | |
| 62 | ||
| 63 | char* m_base; | |
| 64 | size_t m_maxSize; | |
| 65 | ||
| 66 | }; | |
| 67 | ||
| 68 | // Size of the large up-front reservation | |
| 69 | #if defined(__WINS__) | |
| 70 | // Emulator has limited virtual address space | |
| 71 | const size_t largeReservationSize = 96*1024*1024; | |
| 72 | #else | |
| 73 | // HW has plenty of virtual addresses | |
| 74 | const size_t largeReservationSize = 256*1024*1024; | |
| 75 | #endif | |
| 76 | ||
| 77 | class PageAllocatorSymbian { | |
| 78 | ||
| 79 | public: | |
| 80 | PageAllocatorSymbian(); | |
| 81 | ~PageAllocatorSymbian(); | |
| 82 | ||
| 83 | void* reserve(size_t); | |
| 84 | void release(void*, size_t); | |
| 85 | bool commit(void*, size_t); | |
| 86 | bool decommit(void*, size_t); | |
| 87 | ||
| 88 | bool contains(const void*) const; | |
| 89 | ||
| 90 | private: | |
| 91 | static const size_t m_pageSize = 4096; | |
| 92 | SymbianChunk* m_chunk; | |
| 93 | Bitmap<largeReservationSize / m_pageSize> m_map; | |
| 94 | ||
| 95 | }; | |
| 96 | ||
| 97 | } // namespace WTF | |
| 98 | ||
| 99 | #endif // PageAllocatorSymbian_h | |
| 100 |