文件列表:

jamvm-1.5.4\acinclude.m4 (824, 2005-09-05)
jamvm-1.5.4\ACKNOWLEDGEMENTS (311, 2005-09-05)
jamvm-1.5.4\aclocal.m4 (271897, 2010-01-01)
jamvm-1.5.4\AUTHORS (34, 2010-01-01)
jamvm-1.5.4\ChangeLog (71, 2005-09-05)
jamvm-1.5.4\config.guess (44892, 2009-01-03)
jamvm-1.5.4\config.sub (33387, 2009-01-03)
jamvm-1.5.4\configure (800555, 2010-01-01)
jamvm-1.5.4\configure.ac (12835, 2010-01-01)
jamvm-1.5.4\COPYING (18007, 2005-09-05)
jamvm-1.5.4\depcomp (13866, 2005-09-05)
jamvm-1.5.4\INSTALL (12740, 2009-07-24)
jamvm-1.5.4\install-sh (5598, 2005-09-05)
jamvm-1.5.4\lib\classes.zip (22133, 2010-01-01)
jamvm-1.5.4\lib\gnu\classpath\Makefile.am (885, 2010-01-01)
jamvm-1.5.4\lib\gnu\classpath\Makefile.in (9197, 2010-01-02)
jamvm-1.5.4\lib\gnu\classpath\VMStackWalker.java (4164, 2006-08-30)
jamvm-1.5.4\lib\gnu\classpath\VMSystemProperties.java (4550, 2005-09-05)
jamvm-1.5.4\lib\gnu\Makefile.am (846, 2010-01-01)
jamvm-1.5.4\lib\gnu\Makefile.in (14769, 2010-01-02)
jamvm-1.5.4\lib\jamvm\java\lang\JarLauncher.java (2174, 2010-01-01)
jamvm-1.5.4\lib\jamvm\java\lang\Makefile.am (882, 2010-01-01)
jamvm-1.5.4\lib\jamvm\java\lang\Makefile.in (9200, 2010-01-02)
jamvm-1.5.4\lib\jamvm\java\lang\VMClassLoaderData.java (1392, 2010-01-01)
jamvm-1.5.4\lib\jamvm\java\Makefile.am (840, 2010-01-01)
jamvm-1.5.4\lib\jamvm\java\Makefile.in (14785, 2010-01-02)
jamvm-1.5.4\lib\jamvm\Makefile.am (884, 2010-01-01)
jamvm-1.5.4\lib\jamvm\Makefile.in (14808, 2010-01-02)
jamvm-1.5.4\lib\jamvm\ThreadInfoHelper.java (1425, 2010-01-01)
jamvm-1.5.4\lib\java\lang\Makefile.am (961, 2010-01-01)
jamvm-1.5.4\lib\java\lang\Makefile.in (14903, 2010-01-02)
jamvm-1.5.4\lib\java\lang\reflect\Makefile.am (890, 2010-01-01)
jamvm-1.5.4\lib\java\lang\reflect\Makefile.in (9214, 2010-01-02)
jamvm-1.5.4\lib\java\lang\reflect\VMConstructor.java (6119, 2009-01-02)
jamvm-1.5.4\lib\java\lang\reflect\VMField.java (22621, 2009-04-30)
jamvm-1.5.4\lib\java\lang\reflect\VMMethod.java (7278, 2009-01-02)
jamvm-1.5.4\lib\java\lang\VMClass.java (17084, 2009-07-24)
jamvm-1.5.4\lib\java\lang\VMClassLoader.java (13181, 2009-07-24)
jamvm-1.5.4\lib\java\lang\VMRuntime.java (6867, 2006-05-31)
jamvm-1.5.4\lib\java\lang\VMString.java (393, 2005-09-05)
... ...

JamVM 1.5.4 =========== Welcome to the twenty-seventh release of JamVM! JamVM is a Java Virtual Machine which conforms to the JVM specification version 2 (blue book). In comparison to most other VM's (free and commercial) it is extremely small, with a stripped executable on PowerPC of only ~220K, and Intel 200K. However, unlike other small VMs (e.g. KVM) it is designed to support the full specification, and includes support for object finalisation, soft/weak/phantom references, the Java Native Interface (JNI) and the Reflection API. Supported Architectures ======================= JamVM is easy to port to new architectures as most of the code is written in C (only a small amount of assembler code is required). So far, JamVM has been built and tested on : Linux ----- - PowerPC: for many years my main platform, so this was well tested. Built and tested on G3 and G4 systems. - i386: built and tested on i586, i686 (Pentium III), Pentium 4, Athlon and Core 2 Duo. At least an i486 is needed because JamVM uses the cmpxchg instruction, which was first introduced on the i486. - ARM: Originally ported and tested on the iPAQ running Linux (3950, with xscale PXA250 processor, though it should work on StrongARM). Later development on Neo1973 (ARM920T core), and Beagle Board (Cortex A8). Little and Big Endian machines are supported, soft/kernel FP emulation, and OABI or EABI. - AMD***: built and tested on AMD Athlon ***, Phenom, Phenom II, Pentium 4 and Core 2 Duo (using EM***T). - MIPS: built and tested on mipsel using the O32 ABI. The system was an embedded wireless router. Mac OS X/Darwin --------------- - PowerPC: built and tested on Mac OS X 10.3 (Panther) and 10.4 (Tiger) on G3, G4 and G5 systems. It should also work on 10.2, but you may need to install Fink. Note, gcc-3.3 gives better performance than gcc-4.0. - PowerPC*** (a.k.a G5): to build a ***-bit executable CFLAGS must include the flag -arch ppc***. If no option is given a 32-bit executable is built by default. - i386: JamVM has been built and tested on the Apple MacBook Pro (Intel Core Duo and Core 2 Duo), running Mac OS X 10.4 and 10.5. - ARM: iPhone (jailbroken) BSD Variants ------------ FreeBSD : i386, powerpc, ARM, AMD*** (x86_***), Sparc. OpenBSD : i386, powerpc, ARM, AMD*** (x86_***). KFreeBSD : i386 Solaris/OpenSolaris ------------------- x86 : Solaris/OpenSolaris on x86 is combined, with only one OS for both i386 and AMD***. By default, JamVM will be built in 32-bit mode. To build in ***-bit mode, you must specify CFLAGS when configuring and include -m***. Class Libraries =============== JamVM is designed to use the GNU classpath Java class library (see http://www.gnu.org/software/classpath). A number of classes are reference classes which must be modified for a particular VM. These are provided and built along with JamVM (see INSTALL). JamVM 1.5.4 works with Classpath version 0.*** (the latest development snapshot). It should also work with the latest version direct from CVS (but check the Classpath mailing lists for possible patches). Later snapshots of Classpath may also work, if no modifications have been made to the VM interface. Note, JamVM 1.5.4 will not work with versions of Classpath earlier than 0.***, nor will it work with the class library from Sun or IBM's Virtual Machines, or OpenJDK. Building and Installing ======================= Please see the INSTALL file for full instructions. Running ======= You don't need to setup any environment variables to run JamVM. By default, JamVM installs in /usr/local/jamvm/bin (see INSTALL for how to change it). Add /usr/local/jamvm/bin to your path, and you should be able to simply run `jamvm'. CLASSPATH, -classpath, -bootclasspath and LD_LIBRARY_PATH variables ------------------------------------------------------------------- The location of user classes can be specified on the JamVM command line using -classpath (or -cp) or via the CLASSPATH environment variable. If neither is specified, the classpath defaults to '.', i.e. the current directory. The -classpath option takes priority -- if this is specified, CLASSPATH is ignored. The system classes (GNU Classpath and JamVM's VM classes) are loaded via the system class loader. By default it searches the GNU Classpath installation directory and JamVM's installation location. This can be overridden using the -Xbootclasspath command line option, or the BOOTCLASSPATH variable. By default JamVM searches the GNU Classpath installation directory and the current directory ('.') for native libraries. Extra directories can be specified using the LD_LIBRARY_PATH environment variable. Testing ======= Currently JamVM has been used to run fairly major command-line programs including Javac, SPECJvm *** benchmark suite, jBYTEmark and Mauve. It has also been successfully used with Jetty (a Java-based web server and servlet container, Tomcat, JEdit and Eclipse. FEEDBACK ======== I welcome feedback of any kind, e.g. bug reports, suggestions, etc. I'm always interested to hear how and if people are using JamVM so even if you don't have a problem drop me an email (email address at the bottom). JamVM "Features" ================ For those interested in the design of virtual machines, JamVM includes a number of optimisations to improve speed and reduce foot-print. A list, in no particular order, is given below. - Uses native threading (posix threads). Full thread implementation including Thread.interrupt() - Object references are direct pointers (i.e. no handles) - Supports class loaders - Efficient thin locks for fast locking in uncontended cases (the majority of locking) without using spin-locking - Two word object header to minimise heap overhead (lock word and class pointer) - Execution engine supports many levels of optimisation (see configure --help) from basic switched interpreter to inline-threaded interpreter with stack-caching (aka code-copying JIT, equivalent performance to a simple JIT). - Stop-the-world garbage collector, with separate mark/sweep and mark/compact phases to minimise heap fragmentation - Thread suspension uses signals to reduce supend latency and improve performance (no suspension checks during normal execution) - Full object finalisation support within the garbage collector (with finaliser thread) - Full GC support for Soft, Weak and Phantom References. References are enqueued using a seperate thread (the reference handler) - Full GC support for class and class-loader unloading (including associated shared libraries) - Garbage collector can run synchronously or asynchronously within its own thread - String constants within class files are stored in hash table to minimise class data overhead (string constants shared between all classes) - Supports JNI and dynamic loading for use with standard libraries - Uses its own lightweight native interface for internal native methods without overhead of JNI - JamVM is written in C, with a small amount of platform dependent assembler, and is easily portable to other architectures. That's it! Robert Lougher 1st January 2010.

近期下载者：

相关文件：

评论：[我要评论] [举报此文件]

收藏者：