dvander@0: /*
dvander@0:  * Copyright (C) 2012 David Anderson
dvander@0:  *
dvander@0:  * This file is part of JITCraft.
dvander@0:  *
dvander@0:  * JITCraft is free software: you can redistribute it and/or modify it under
dvander@0:  * the terms of the GNU General Public License as published by the Free
dvander@0:  * Software Foundation, either version 3 of the License, or (at your option)
dvander@0:  * any later version.
dvander@0:  * 
dvander@0:  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY
dvander@0:  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
dvander@0:  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
dvander@0:  *
dvander@0:  * You should have received a copy of the GNU General Public License along with
dvander@0:  * JITCraft. If not, see http://www.gnu.org/licenses/.
dvander@0:  */
dvander@0: #ifndef _include_jc_unsafe_array_
dvander@0: #define _include_jc_unsafe_array_
dvander@0: 
dvander@0: #include <assert.h>
dvander@0: 
dvander@0: namespace jc {
dvander@0: 
dvander@0: class UnsafeArray
dvander@0: {
dvander@0:   public:
dvander@0:     unsigned length() {
dvander@0:         return *(reinterpret_cast<unsigned *>(this) - 1);
dvander@0:     }
dvander@0: 
dvander@0:     unsigned *uint32Vector() {
dvander@0:         return reinterpret_cast<unsigned *>(this);
dvander@0:     }
dvander@0:     int *int32Vector() {
dvander@0:         return reinterpret_cast<int *>(this);
dvander@0:     }
dvander@0:     int readInt32(size_t index) {
dvander@0:         assert(index < length());
dvander@0:         return int32Vector()[index];
dvander@0:     }
dvander@0:     void writeInt32(size_t index, int value) {
dvander@0:         assert(index < length());
dvander@0:         int32Vector()[index] = value;
dvander@0:     }
dvander@0:     UnsafeArray *indirect(size_t index) {
dvander@0:         assert(index < length());
dvander@0:         unsigned *address = uint32Vector() + index;
dvander@0:         return reinterpret_cast<UnsafeArray *>(reinterpret_cast<char *>(address) + *address);
dvander@0:     }
dvander@0:     void *allocationBase() {
dvander@0:         return reinterpret_cast<unsigned *>(this) - 1;
dvander@0:     }
dvander@0: };
dvander@0: 
dvander@0: }
dvander@0: 
dvander@0: #endif // _include_jc_unsafe_array_