Simplify OSAllocator.

Source/wtf/OSAllocator.h

 /*
  * 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
@@ skipping 42 matching lines @@
     // 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.
     WTF_EXPORT_PRIVATE static void* reserveAndCommit(size_t, Usage = UnknownUsage, bool writable = true, bool executable = false, bool includesGuardPages = 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);
-
     // Reallocate an existing, committed allocation.
     // The prior allocation must be fully comitted, and the new size will also be fully committed.
     // This interface is provided since it may be possible to optimize this operation on some platforms.
     template<typename T>
     static T* reallocateCommitted(T*, size_t oldSize, size_t newSize, Usage = UnknownUsage, bool writable = true, bool executable = false);
 };
 
-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));
-    UNUSED_PARAM(decommitBase);
-    UNUSED_PARAM(decommitSize);
-
-    releaseDecommitted(releaseBase, releaseSize);
-}
-
 inline void OSAllocator::decommitAndRelease(void* base, size_t size)
 {
-    decommitAndRelease(base, size, base, size);
+    releaseDecommitted(base, size);
 }
 
 template<typename T>
 inline T* OSAllocator::reallocateCommitted(T* oldBase, size_t oldSize, size_t newSize, Usage usage, bool writable, bool executable)
 {
     void* newBase = reserveAndCommit(newSize, usage, writable, executable);
     memcpy(newBase, oldBase, std::min(oldSize, newSize));
     decommitAndRelease(oldBase, oldSize);
     return static_cast<T*>(newBase);
 }
 
 } // namespace WTF
 
 using WTF::OSAllocator;
 
 #endif // OSAllocator_h