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