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PageAllocationAligned.cpp

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1 /* -

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 * 1. Redistributions of source code must retain the above copyright -

8 * notice, this list of conditions and the following disclaimer. -

9 * 2. Redistributions in binary form must reproduce the above copyright -

10 * notice, this list of conditions and the following disclaimer in the -

11 * documentation and/or other materials provided with the distribution. -

12 * -

13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' -

14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, -

15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR -

16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS -

17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -

18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -

19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -

20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -

21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -

22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF -

23 * THE POSSIBILITY OF SUCH DAMAGE. -

24 */ -

25 -

26 #include "config.h" -

27 #include "PageAllocationAligned.h" -

28 -

29 namespace WTF { -

30 -

31 PageAllocationAligned PageAllocationAligned::allocate(size_t size, size_t alignment, OSAllocator::Usage usage, bool writable) -

32 { -

33 ASSERT(isPageAligned(size)); -

34 ASSERT(isPageAligned(alignment)); -

35 ASSERT(isPowerOfTwo(alignment)); -

36 ASSERT(size >= alignment); -

37 size_t alignmentMask = alignment - 1; -

38 -

39 #if OS(DARWIN) -

40 int flags = VM_FLAGS_ANYWHERE; -

41 if (usage != OSAllocator::UnknownUsage) -

42 flags |= usage; -

43 int protection = PROT_READ; -

44 if (writable) -

45 protection |= PROT_WRITE; -

46 -

47 vm_address_t address = 0; -

48 vm_map(current_task(), &address, size, alignmentMask, flags, MEMORY_OBJECT_NULL, 0, FALSE, protection, PROT_READ | PROT_WRITE, VM_INHERIT_DEFAULT); -

49 return PageAllocationAligned(reinterpret_cast<void*>(address), size); -

50 #else -

51 size_t alignmentDelta = alignment - pageSize(); -

52 -

53 // Resererve with suffcient additional VM to correctly align. -

54 size_t reservationSize = size + alignmentDelta; -

55 void* reservationBase = OSAllocator::reserveUncommitted(reservationSize, usage, writable); -

56 -

57 // Select an aligned region within the reservation and commit. -

void* alignedBase = reinterpret_cast<uintptr_t>(reservationBase) & alignmentMask

reinterpret_ca... alignmentMask	Description
TRUE	never evaluated
FALSE	never evaluated

59 ? reinterpret_cast<void*>((reinterpret_cast<uintptr_t>(reservationBase) & ~alignmentMask) + alignment) -

60 : reservationBase; -

61 OSAllocator::commit(alignedBase, size, writable, false); -

62 -

return PageAllocationAligned(alignedBase, size, reservationBase, reservationSize);

never executed: return PageAllocationAligned(alignedBase, size, reservationBase, reservationSize);

64 #endif -

65 } -

66 -

67 void PageAllocationAligned::deallocate() -

68 { -

69 // Clear base & size before calling release; if this is *inside* allocation -

70 // then we won't be able to clear then after deallocating the memory. -

71 PageAllocationAligned tmp; -

72 std::swap(tmp, *this); -

73 -

74 ASSERT(tmp); -

75 ASSERT(!*this); -

76 -

77 #if OS(DARWIN) -

78 vm_deallocate(current_task(), reinterpret_cast<vm_address_t>(tmp.realBase()), tmp.realSize()); -

79 #else -

80 ASSERT(tmp.m_reservation.contains(tmp.realBase(), tmp.realSize())); -

81 OSAllocator::decommitAndRelease(tmp.m_reservation.realBase(), tmp.m_reservation.realSize(), -

82 tmp.realBase(), tmp.realSize()); -

83 #endif -

}

never executed: end of block

85 -

86 } // namespace WTF -

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