Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.+
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DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.+
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  +
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This code is free software; you can redistribute it and/or modify it+
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under the terms of the GNU General Public License version 2 only, as+
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published by the Free Software Foundation.+
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  +
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This code is distributed in the hope that it will be useful, but WITHOUT+
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or+
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License+
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version 2 for more details (a copy is included in the LICENSE file that+
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accompanied this code).+
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 +
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You should have received a copy of the GNU General Public License version+
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2 along with this work; if not, write to the Free Software Foundation,+
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.+
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  +
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Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA+
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or visit www.oracle.com if you need additional information or have any+
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questions.+
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+
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________________________________________________________________________+
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+
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'hsdis':  A HotSpot plugin for disassembling dynamically generated code.+
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+
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The files in this directory (Makefile, hsdis.[ch], hsdis-demo.c)+
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are built independently of the HotSpot JVM.+
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+
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To use the plugin with a JVM, you need a new version that can load it.+
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If the product mode of your JVM does not accept -XX:+PrintAssembly,+
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you do not have a version that is new enough.+
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+
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* Building+
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+
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To build this project you a copy of GNU binutils to build against.  It+
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is known to work with binutils 2.17 and binutils 2.19.1.  Download a+
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copy of the software from http://directory.fsf.org/project/binutils or+
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one of it's mirrors.  Builds targetting windows should use at least+
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2.19 and currently requires the use of a cross compiler.+
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+
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The makefile looks for the sources in build/binutils or you can+
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specify it's location to the makefile using BINTUILS=path.  It will+
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configure binutils and build it first and then build and link the+
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disasembly adapter.  Make all will build the default target for your+
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platform.  If you platform support both 32 and 64 simultaneously then+
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"make both" will build them both at once.  "make all64" will+
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explicitly build the 64 bit version.  By default this will build the+
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disassembler library only.  If you build demo it will build a demo+
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program that attempts to exercise the library.+
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+
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Windows+
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+
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In theory this should be buildable on Windows but getting a working+
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GNU build environment on Windows has proven difficult.  MINGW should+
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be able to do it but at the time of this writing I was unable to get+
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this working.  Instead you can use the mingw cross compiler on linux+
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to produce the windows binaries.  For 32-bit windows you can install+
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mingw32 using your package manager and it will be added to your path+
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automatically.  For 64-bit you need to download the 64 bit mingw from+
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http://sourceforge.net/projects/mingw-w64.  Grab a copy of the+
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complete toolchain and unpack it somewhere.  Put the bin directory of+
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the toolchain in your path.  The mingw installs contain cross compile+
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versions of gcc that are named with a prefix to indicate what they are+
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targetting and you must tell the Makefile which one to use.  This+
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should either be i586-mingw32msvc or x86_64-pc-mingw32 depending on+
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which on you are targetting and there should be a version of gcc in+
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your path named i586-mingw32msvc-gcc or x86_64-pc-mingw32-gcc.  Tell+
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the makefile what prefix to use to find the mingw tools by using+
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MINGW=.  For example:+
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+
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make MINGW=i586-mingw32msvc BINTUILS=build/binutils-2.19.1+
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+
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will build the Win32 cross compiled version of hsdis based on 2.19.1.+
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+
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* Installing+
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+
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Products are named like build/$OS-$LIBARCH/hsdis-$LIBARCH.so.  You can+
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install them on your LD_LIBRARY_PATH, or inside of your JRE/JDK.  The+
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search path in the JVM is:+
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+
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1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so+
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2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so+
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3. <home>/jre/lib/<arch>/hsdis-<arch>.so+
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4. hsdis-<arch>.so  (using LD_LIBRARY_PATH)+
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+
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Note that there's a bug in hotspot versions prior to hs22 that causes+
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steps 2 and 3 to fail when used with JDK7.+
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+
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Now test:+
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+
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  export LD_LIBRARY_PATH .../hsdis/build/$OS-$LIBARCH:$LD_LIBRARY_PATH+
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  dargs='-XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly'+
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  dargs=$dargs' -XX:PrintAssemblyOptions=hsdis-print-bytes'+
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  java $dargs -Xbatch CompileCommand=print,*String.hashCode HelloWorld+
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+
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If the product mode of the JVM does not accept -XX:+PrintAssembly,+
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you do not have a version new enough to use the hsdis plugin.+
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