The Tor Browser: js/src/yarr/OSAllocator.h@129ffea94266 (annotated)

js/src/yarr/OSAllocator.h@129ffea94266 (annotated)

js/src/yarr/OSAllocator.h

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  *
  * ***** BEGIN LICENSE BLOCK *****
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  *
  * ***** END LICENSE BLOCK ***** */
 #ifndef yarr_OSAllocator_h
 #define yarr_OSAllocator_h
 #include <stdlib.h>
 #include "yarr/wtfbridge.h"
 #include "assembler/wtf/VMTags.h"
 #include "assembler/wtf/Assertions.h"
 namespace WTF {
 class OSAllocator {
 public:
     enum Usage {
         UnknownUsage = -1,
         FastMallocPages = VM_TAG_FOR_TCMALLOC_MEMORY,
         JSGCHeapPages = VM_TAG_FOR_COLLECTOR_MEMORY,
         JSVMStackPages = VM_TAG_FOR_REGISTERFILE_MEMORY,
         JSJITCodePages = VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY
     };
     // These methods are symmetric; reserveUncommitted allocates VM in an uncommitted state,
     // releaseDecommitted should be called on a region of VM allocated by a single reservation,
     // the memory must all currently be in a decommitted state.
     static void* reserveUncommitted(size_t, Usage = UnknownUsage, bool writable = true, bool executable = false);
     static void releaseDecommitted(void*, size_t);
     // These methods are symmetric; they commit or decommit a region of VM (uncommitted VM should
     // never be accessed, since the OS may not have attached physical memory for these regions).
     // Clients should only call commit on uncommitted regions and decommit on committed regions.
     static void commit(void*, size_t, bool writable, bool executable);
     static void decommit(void*, size_t);
     // These methods are symmetric; reserveAndCommit allocates VM in an committed state,
     // decommitAndRelease should be called on a region of VM allocated by a single reservation,
     // the memory must all currently be in a committed state.
     static void* reserveAndCommit(size_t, Usage = UnknownUsage, bool writable = true, bool executable = false);
     static void decommitAndRelease(void* base, size_t size);
     // These methods are akin to reserveAndCommit/decommitAndRelease, above - however rather than
     // committing/decommitting the entire region additional parameters allow a subregion to be
     // specified.
     static void* reserveAndCommit(size_t reserveSize, size_t commitSize, Usage = UnknownUsage, bool writable = true, bool executable = false);
     static void decommitAndRelease(void* releaseBase, size_t releaseSize, void* decommitBase, size_t decommitSize);
 };
 inline void* OSAllocator::reserveAndCommit(size_t reserveSize, size_t commitSize, Usage usage, bool writable, bool executable)
 {
     void* base = reserveUncommitted(reserveSize, usage, writable, executable);
     commit(base, commitSize, writable, executable);
     return base;
 }
 inline void OSAllocator::decommitAndRelease(void* releaseBase, size_t releaseSize, void* decommitBase, size_t decommitSize)
 {
     ASSERT(decommitBase >= releaseBase && (static_cast<char*>(decommitBase) + decommitSize) <= (static_cast<char*>(releaseBase) + releaseSize));
 #if WTF_OS_WINCE || WTF_OS_SYMBIAN
     // On most platforms we can actually skip this final decommit; releasing the VM will
     // implicitly decommit any physical memory in the region. This is not true on WINCE.
     // On Symbian, this makes implementation simpler and better aligned with the RChunk API
     decommit(decommitBase, decommitSize);
 #endif
     releaseDecommitted(releaseBase, releaseSize);
 }
 inline void OSAllocator::decommitAndRelease(void* base, size_t size)
 {
     decommitAndRelease(base, size, base, size);
 }
 } // namespace WTF
 using WTF::OSAllocator;
 #endif /* yarr_OSAllocator_h */

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js/src/yarr/OSAllocator.h@129ffea94266 (annotated)

js/src/yarr/OSAllocator.h