4ac61acb3a
Fix up some broken mac projects. Consolidate project settings in xcconfig files. http://breakpad.appspot.com/130001 git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@627 4c0a9323-5329-0410-9bdc-e9ce6186880e
86 lines
3.6 KiB
C++
86 lines
3.6 KiB
C++
// Copyright (c) 2006, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// ProtectedMemoryAllocator
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//
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// A very simple allocator class which allows allocation, but not deallocation.
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// The allocations can be made read-only with the Protect() method.
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// This class is NOT useful as a general-purpose memory allocation system,
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// since it does not allow deallocation. It is useful to use for a group
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// of allocations which are created in the same time-frame and destroyed
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// in the same time-frame. It is useful for making allocations of memory
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// which will not need to change often once initialized. This memory can then
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// be protected from memory smashers by calling the Protect() method.
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#ifndef PROTECTED_MEMORY_ALLOCATOR_H__
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#define PROTECTED_MEMORY_ALLOCATOR_H__
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#include <mach/mach.h>
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//
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class ProtectedMemoryAllocator {
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public:
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ProtectedMemoryAllocator(vm_size_t pool_size);
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~ProtectedMemoryAllocator();
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// Returns a pointer to an allocation of size n within the pool.
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// Fails by returning NULL is no more space is available.
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// Please note that the pointers returned from this method should not
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// be freed in any way (for example by calling free() on them ).
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char * Allocate(vm_size_t n);
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// Returns the base address of the allocation pool.
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char * GetBaseAddress() { return (char*)base_address_; }
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// Returns the size of the allocation pool, including allocated
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// plus free space.
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vm_size_t GetTotalSize() { return pool_size_; }
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// Returns the number of bytes already allocated in the pool.
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vm_size_t GetAllocatedSize() { return next_alloc_offset_; }
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// Returns the number of bytes available for allocation.
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vm_size_t GetFreeSize() { return pool_size_ - next_alloc_offset_; }
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// Makes the entire allocation pool read-only including, of course,
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// all allocations made from the pool.
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kern_return_t Protect();
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// Makes the entire allocation pool read/write.
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kern_return_t Unprotect();
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private:
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vm_size_t pool_size_;
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vm_address_t base_address_;
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vm_size_t next_alloc_offset_;
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bool valid_;
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};
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#endif // PROTECTED_MEMORY_ALLOCATOR_H__
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