Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved.
DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  
The Universal Permissive License (UPL), Version 1.0

Subject to the condition set forth below, permission is hereby granted to
any person obtaining a copy of this software, associated documentation
and/or data (collectively the "Software"), free of charge and under any
and all copyright rights in the Software, and any and all patent rights
owned or freely licensable by each licensor hereunder covering either (i)
the unmodified Software as contributed to or provided by such licensor,
or (ii) the Larger Works (as defined below), to deal in both

(a) the Software, and

(b) any piece of software and/or hardware listed in the lrgrwrks.txt file
if one is included with the Software (each a "Larger Work" to which the
Software is contributed by such licensors),

without restriction, including without limitation the rights to copy,
create derivative works of, display, perform, and distribute the Software
and make, use, sell, offer for sale, import, export, have made, and have
sold the Software and the Larger Work(s), and to sublicense the foregoing
rights on either these or other terms.

This license is subject to the following condition:

The above copyright notice and either this complete permission notice or
at a minimum a reference to the UPL must be included in all copies or
substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.

Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
or visit www.oracle.com if you need additional information or have any
questions.

________________________________________________________________________

'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 need a copy of GNU binutils to build against.
It is known to work with binutils 2.29.1, 2.30, and 2.31.1. Building
against versions older than 2.29 is no longer supported. Download a
copy of the software from http://directory.fsf.org/project/binutils or
one of its mirrors.  Builds targetting windows currently require 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 BINUTILS=build/binutils-2.31.1

will build the Win32 cross compiled version of hsdis based on 2.31.1.

* 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