1 /* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 4 -*- */
2 /* vi: set ts=4 sw=4 expandtab: (add to ~/.vimrc: set modeline modelines=5) */
3 /* ***** BEGIN LICENSE BLOCK *****
4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
16 * The Original Code is [Open Source Virtual Machine].
18 * The Initial Developer of the Original Code is
19 * Adobe System Incorporated.
20 * Portions created by the Initial Developer are Copyright (C) 2009
21 * the Initial Developer. All Rights Reserved.
26 * Alternatively, the contents of this file may be used under the terms of
27 * either the GNU General Public License Version 2 or later (the "GPL"), or
28 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
38 * ***** END LICENSE BLOCK ***** */
40 #ifndef __nanojit_Allocator__
41 #define __nanojit_Allocator__
46 * Allocator is a bump-pointer allocator with an SPI for getting more
47 * memory from embedder-implemented allocator, such as malloc()/free().
49 * allocations never return NULL. The implementation of allocChunk()
50 * is expected to perform a longjmp or exception when an allocation can't
59 /** alloc memory, never return null. */
60 void* alloc(size_t nbytes
) {
61 nbytes
= (nbytes
+ 7) & ~7; // round up
62 if (current_top
+ nbytes
<= current_limit
) {
63 void *p
= current_top
;
64 current_top
+= nbytes
;
67 return allocSlow(nbytes
);
71 void* allocSlow(size_t nbytes
);
72 void fill(size_t minbytes
);
77 int64_t data
[1]; // int64_t forces 8-byte alignment.
86 /** allocate another block from a host provided allocator */
87 void* allocChunk(size_t nbytes
);
89 /** free back to the same allocator */
90 void freeChunk(void*);
92 /** hook for post-reset action. */
97 /** global new overload enabling this pattern: new (allocator) T(...) */
98 inline void* operator new(size_t size
, nanojit::Allocator
&a
) {
102 /** global new overload enabling this pattern: new (allocator) T(...) */
103 inline void* operator new(size_t size
, nanojit::Allocator
*a
) {
104 return a
->alloc(size
);
107 /** global new[] overload enabling this pattern: new (allocator) T[] */
108 inline void* operator new[](size_t size
, nanojit::Allocator
& a
) {
109 return a
.alloc(size
);
112 /** global new[] overload enabling this pattern: new (allocator) T[] */
113 inline void* operator new[](size_t size
, nanojit::Allocator
* a
) {
114 return a
->alloc(size
);
117 #endif // __nanojit_Allocator__