1 /* src/mm/codememory.c - code memory management
3 Copyright (C) 1996-2005, 2006, 2007, 2008
4 CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
6 This file is part of CACAO.
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
30 #include <sys/mman.h> /* REMOVEME */
32 #include "threads/lock-common.h"
33 #include "threads/thread.h"
35 #include "mm/codememory.h"
36 #include "mm/memory.h"
38 #include "vmcore/options.h"
40 #if defined(ENABLE_STATISTICS)
41 # include "vmcore/statistics.h"
44 #include "vmcore/system.h"
46 #include "vm/global.h"
49 /* global code memory variables ***********************************************/
51 #define DEFAULT_CODE_MEMORY_SIZE 128 * 1024 /* defaulting to 128kB */
53 #if defined(ENABLE_THREADS)
54 static java_object_t *lock_code_memory = NULL;
56 static void *code_memory = NULL;
57 static int code_memory_size = 0;
58 static int pagesize = 0;
61 /* codememory_init *************************************************************
63 Initialize the code memory subsystem.
65 *******************************************************************************/
67 void codememory_init(void)
69 TRACESUBSYSTEMINITIALIZATION("codememory_init");
71 #if defined(ENABLE_THREADS)
72 /* create lock for code memory */
74 lock_code_memory = NEW(java_object_t);
76 lock_init_object_lock(lock_code_memory);
79 /* Get the pagesize of this architecture. */
81 pagesize = system_getpagesize();
85 /* codememory_get **************************************************************
87 Allocates memory from the heap via mmap and make the memory read-,
88 write-, and executeable.
90 *******************************************************************************/
92 void *codememory_get(size_t size)
96 LOCK_MONITOR_ENTER(lock_code_memory);
98 size = MEMORY_ALIGN(size, ALIGNSIZE);
100 /* check if enough memory is available */
102 if (size > code_memory_size) {
103 /* set default code size */
105 code_memory_size = DEFAULT_CODE_MEMORY_SIZE;
107 /* do we need more? */
109 if (size > code_memory_size)
110 code_memory_size = size;
112 /* align the size of the memory to be allocated */
114 code_memory_size = MEMORY_ALIGN(code_memory_size, pagesize);
116 #if defined(ENABLE_STATISTICS)
118 codememusage += code_memory_size;
120 if (codememusage > maxcodememusage)
121 maxcodememusage = codememusage;
125 /* allocate the memory */
127 p = system_mmap_anonymous(NULL, code_memory_size,
128 PROT_READ | PROT_WRITE | PROT_EXEC,
131 /* set global code memory pointer */
136 /* get a memory chunk of the allocated memory */
140 code_memory = (void *) ((ptrint) code_memory + size);
141 code_memory_size -= size;
143 LOCK_MONITOR_EXIT(lock_code_memory);
149 /* codememory_release **********************************************************
151 Release the code memory and return it to the code memory
155 p ...... pointer to the code memory
156 size ... size of the code memory
158 *******************************************************************************/
160 void codememory_release(void *p, size_t size)
167 * These are local overrides for various environment variables in Emacs.
168 * Please do not remove this and leave it at the end of the file, where
169 * Emacs will automagically detect them.
170 * ---------------------------------------------------------------------
173 * indent-tabs-mode: t
177 * vim:noexpandtab:sw=4:ts=4: