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118 lines
4.0 KiB
C++
118 lines
4.0 KiB
C++
/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 4 -*- */
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/* vi: set ts=4 sw=4 expandtab: (add to ~/.vimrc: set modeline modelines=5) */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is [Open Source Virtual Machine].
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*
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* The Initial Developer of the Original Code is
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* Adobe System Incorporated.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Adobe AS3 Team
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __nanojit_Allocator__
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#define __nanojit_Allocator__
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namespace nanojit
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{
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/**
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* Allocator is a bump-pointer allocator with an SPI for getting more
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* memory from embedder-implemented allocator, such as malloc()/free().
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*
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* allocations never return NULL. The implementation of allocChunk()
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* is expected to perform a longjmp or exception when an allocation can't
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* proceed.
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*/
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class Allocator {
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public:
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Allocator();
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~Allocator();
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void reset();
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/** alloc memory, never return null. */
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void* alloc(size_t nbytes) {
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nbytes = (nbytes + 7) & ~7; // round up
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if (current_top + nbytes <= current_limit) {
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void *p = current_top;
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current_top += nbytes;
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return p;
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}
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return allocSlow(nbytes);
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}
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protected:
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void* allocSlow(size_t nbytes);
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void fill(size_t minbytes);
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class Chunk {
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public:
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Chunk* prev;
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int64_t data[1]; // int64_t forces 8-byte alignment.
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};
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Chunk* current_chunk;
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char* current_top;
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char* current_limit;
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// allocator SPI
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/** allocate another block from a host provided allocator */
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void* allocChunk(size_t nbytes);
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/** free back to the same allocator */
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void freeChunk(void*);
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/** hook for post-reset action. */
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void postReset();
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};
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}
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/** global new overload enabling this pattern: new (allocator) T(...) */
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inline void* operator new(size_t size, nanojit::Allocator &a) {
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return a.alloc(size);
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}
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/** global new overload enabling this pattern: new (allocator) T(...) */
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inline void* operator new(size_t size, nanojit::Allocator *a) {
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return a->alloc(size);
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}
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/** global new[] overload enabling this pattern: new (allocator) T[] */
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inline void* operator new[](size_t size, nanojit::Allocator& a) {
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return a.alloc(size);
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}
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/** global new[] overload enabling this pattern: new (allocator) T[] */
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inline void* operator new[](size_t size, nanojit::Allocator* a) {
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return a->alloc(size);
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}
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#endif // __nanojit_Allocator__
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