The Tor Browser / file comparison
comparison: js/src/yarr/PageAllocation.h
js/src/yarr/PageAllocation.h
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- TOR_BUG_3246
- changeset 5
- 4ab42b5ab56c
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| -1:000000000000 | 0:05d31f973481 |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * | |
| 4 * ***** BEGIN LICENSE BLOCK ***** | |
| 5 * Copyright (C) 2010 Apple Inc. All rights reserved. | |
| 6 * | |
| 7 * Redistribution and use in source and binary forms, with or without | |
| 8 * modification, are permitted provided that the following conditions | |
| 9 * are met: | |
| 10 * 1. Redistributions of source code must retain the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer. | |
| 12 * 2. Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 24 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 * | |
| 28 * ***** END LICENSE BLOCK ***** */ | |
| 29 | |
| 30 #ifndef yarr_PageAllocation_h | |
| 31 #define yarr_PageAllocation_h | |
| 32 | |
| 33 #include "yarr/wtfbridge.h" | |
| 34 #include "yarr/OSAllocator.h" | |
| 35 #include "yarr/PageBlock.h" | |
| 36 #include "assembler/wtf/VMTags.h" | |
| 37 | |
| 38 #if WTF_OS_DARWIN | |
| 39 #include <mach/mach_init.h> | |
| 40 #include <mach/vm_map.h> | |
| 41 #endif | |
| 42 | |
| 43 #if WTF_OS_HAIKU | |
| 44 #include <OS.h> | |
| 45 #endif | |
| 46 | |
| 47 #if WTF_OS_WINDOWS | |
| 48 #include <malloc.h> | |
| 49 #include <windows.h> | |
| 50 #endif | |
| 51 | |
| 52 #if WTF_OS_SYMBIAN | |
| 53 #include <e32hal.h> | |
| 54 #include <e32std.h> | |
| 55 #endif | |
| 56 | |
| 57 #if WTF_HAVE_ERRNO_H | |
| 58 #include <errno.h> | |
| 59 #endif | |
| 60 | |
| 61 #if WTF_HAVE_MMAP | |
| 62 #include <sys/mman.h> | |
| 63 #include <unistd.h> | |
| 64 #endif | |
| 65 | |
| 66 namespace WTF { | |
| 67 | |
| 68 /* | |
| 69 PageAllocation | |
| 70 | |
| 71 The PageAllocation class provides a cross-platform memory allocation interface | |
| 72 with similar capabilities to posix mmap/munmap. Memory is allocated by calling | |
| 73 PageAllocation::allocate, and deallocated by calling deallocate on the | |
| 74 PageAllocation object. The PageAllocation holds the allocation's base pointer | |
| 75 and size. | |
| 76 | |
| 77 The allocate method is passed the size required (which must be a multiple of | |
| 78 the system page size, which can be accessed using PageAllocation::pageSize). | |
| 79 Callers may also optinally provide a flag indicating the usage (for use by | |
| 80 system memory usage tracking tools, where implemented), and boolean values | |
| 81 specifying the required protection (defaulting to writable, non-executable). | |
| 82 */ | |
| 83 | |
| 84 class PageAllocation : private PageBlock { | |
| 85 public: | |
| 86 PageAllocation() | |
| 87 { | |
| 88 } | |
| 89 | |
| 90 using PageBlock::size; | |
| 91 using PageBlock::base; | |
| 92 | |
| 93 #ifndef __clang__ | |
| 94 using PageBlock::operator bool; | |
| 95 #else | |
| 96 // FIXME: This is a workaround for <rdar://problem/8876150>, wherein Clang incorrectly emits an access | |
| 97 // control warning when a client tries to use operator bool exposed above via "using PageBlock::operator bool". | |
| 98 operator bool() const { return PageBlock::operator bool(); } | |
| 99 #endif | |
| 100 | |
| 101 static PageAllocation allocate(size_t size, OSAllocator::Usage usage = OSAllocator::UnknownUsage, bool writable = true, bool executable = false) | |
| 102 { | |
| 103 ASSERT(isPageAligned(size)); | |
| 104 return PageAllocation(OSAllocator::reserveAndCommit(size, usage, writable, executable), size); | |
| 105 } | |
| 106 | |
| 107 void deallocate() | |
| 108 { | |
| 109 // Clear base & size before calling release; if this is *inside* allocation | |
| 110 // then we won't be able to clear then after deallocating the memory. | |
| 111 PageAllocation tmp; | |
| 112 JSC::std::swap(tmp, *this); | |
| 113 | |
| 114 ASSERT(tmp); | |
| 115 ASSERT(!*this); | |
| 116 | |
| 117 OSAllocator::decommitAndRelease(tmp.base(), tmp.size()); | |
| 118 } | |
| 119 | |
| 120 private: | |
| 121 PageAllocation(void* base, size_t size) | |
| 122 : PageBlock(base, size) | |
| 123 { | |
| 124 } | |
| 125 }; | |
| 126 | |
| 127 } // namespace WTF | |
| 128 | |
| 129 using WTF::PageAllocation; | |
| 130 | |
| 131 #endif /* yarr_PageAllocation_h */ |
