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| DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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| This code is free software; you can redistribute it and/or modify it |
| under the terms of the GNU General Public License version 2 only, as |
| published by the Free Software Foundation. |
| |
| This code is distributed in the hope that it will be useful, but WITHOUT |
| ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| version 2 for more details (a copy is included in the LICENSE file that |
| accompanied this code). |
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| 2 along with this work; if not, write to the Free Software Foundation, |
| Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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| ________________________________________________________________________ |
| |
| 'hsdis': A HotSpot plugin for disassembling dynamically generated code. |
| |
| The files in this directory (Makefile, hsdis.[ch], hsdis-demo.c) |
| are built independently of the HotSpot JVM. |
| |
| To use the plugin with a JVM, you need a new version that can load it. |
| If the product mode of your JVM does not accept -XX:+PrintAssembly, |
| you do not have a version that is new enough. |
| |
| * Building |
| |
| To build this project you a copy of GNU binutils to build against. It |
| is known to work with binutils 2.17 and binutils 2.19.1. Download a |
| copy of the software from http://directory.fsf.org/project/binutils or |
| one of it's mirrors. Builds targetting windows should use at least |
| 2.19 and currently requires the use of a cross compiler. |
| |
| Binutils should be configured with the '--disable-nls' flag to disable |
| Native Language Support, otherwise you might get an "undefined |
| reference to `libintl_gettext'" if you try to load hsdis.so on systems |
| which don't have NLS by default. It also avoids build problems on |
| other configurations that don't include the full NLS support. |
| |
| The makefile looks for the sources in build/binutils or you can |
| specify it's location to the makefile using BINUTILS=path. It will |
| configure binutils and build it first and then build and link the |
| disasembly adapter. Make all will build the default target for your |
| platform. If you platform support both 32 and 64 simultaneously then |
| "make both" will build them both at once. "make all64" will |
| explicitly build the 64 bit version. By default this will build the |
| disassembler library only. If you build demo it will build a demo |
| program that attempts to exercise the library. |
| |
| With recent version of binutils (i.e. binutils-2.23.2) you may get the |
| following build error: |
| |
| WARNING: `makeinfo' is missing on your system. You should only need it if |
| you modified a `.texi' or `.texinfo' file, or any other file |
| ... |
| |
| This is because of "Bug 15345 - binutils-2.23.2 tarball doesn't build |
| without makeinfo" [2]. The easiest way to work around this problem is |
| by doing a "touch $BINUTILS/bfd/doc/bfd.info". |
| |
| Windows |
| |
| In theory this should be buildable on Windows but getting a working |
| GNU build environment on Windows has proven difficult. MINGW should |
| be able to do it but at the time of this writing I was unable to get |
| this working. Instead you can use the mingw cross compiler on linux |
| to produce the windows binaries. For 32-bit windows you can install |
| mingw32 using your package manager and it will be added to your path |
| automatically. For 64-bit you need to download the 64 bit mingw from |
| http://sourceforge.net/projects/mingw-w64. Grab a copy of the |
| complete toolchain and unpack it somewhere. Put the bin directory of |
| the toolchain in your path. The mingw installs contain cross compile |
| versions of gcc that are named with a prefix to indicate what they are |
| targetting and you must tell the Makefile which one to use. This |
| should either be i586-mingw32msvc or x86_64-pc-mingw32 depending on |
| which on you are targetting and there should be a version of gcc in |
| your path named i586-mingw32msvc-gcc or x86_64-pc-mingw32-gcc. Tell |
| the makefile what prefix to use to find the mingw tools by using |
| MINGW=. For example: |
| |
| make MINGW=i586-mingw32msvc BINTUILS=build/binutils-2.19.1 |
| |
| will build the Win32 cross compiled version of hsdis based on 2.19.1. |
| |
| * Installing |
| |
| Products are named like build/$OS-$LIBARCH/hsdis-$LIBARCH.so. You can |
| install them on your LD_LIBRARY_PATH, or inside of your JRE/JDK. The |
| search path in the JVM is: |
| |
| 1. <home>/jre/lib/<arch>/<vm>/libhsdis-<arch>.so |
| 2. <home>/jre/lib/<arch>/<vm>/hsdis-<arch>.so |
| 3. <home>/jre/lib/<arch>/hsdis-<arch>.so |
| 4. hsdis-<arch>.so (using LD_LIBRARY_PATH) |
| |
| Note that there's a bug in hotspot versions prior to hs22 that causes |
| steps 2 and 3 to fail when used with JDK7. |
| |
| Now test: |
| |
| export LD_LIBRARY_PATH .../hsdis/build/$OS-$LIBARCH:$LD_LIBRARY_PATH |
| dargs='-XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly' |
| dargs=$dargs' -XX:PrintAssemblyOptions=hsdis-print-bytes' |
| java $dargs -Xbatch CompileCommand=print,*String.hashCode HelloWorld |
| |
| If the product mode of the JVM does not accept -XX:+PrintAssembly, |
| you do not have a version new enough to use the hsdis plugin. |
| |
| * Wiki |
| |
| More information can be found in the OpenJDK HotSpot Wiki [1]. |
| |
| |
| Resources: |
| |
| [1] https://wiki.openjdk.java.net/display/HotSpot/PrintAssembly |
| [2] http://sourceware.org/bugzilla/show_bug.cgi?id=15345 |