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The files in this directory are built independently of the HotSpot JVM.
hsdis is an interface exposed by Hotspot. There are several backends that implement this interface, using different disassembly engines. Included in the JDK is support for building hsdis with Capstone, LLVM or GNU binutils. The interface is fairly straightforward and easy to implement using other backends.
To compile hsdis, you need to activate hsdis support, and select the proper
backend to use. This is done with the configure switch --with-hsdis=<backend>,
where <backend> is either capstone, llvm or binutils. For details, see
the sections on the respective backends below.
To build the hsdis library, run make build-hsdis. This will build the library
in a separate directory, but not make it available to the JDK in the
configuration. To actually install it in the JDK, run make install-hsdis.
NOTE: If you do this using the binutils backend, the resulting build may not be distributable. Please get legal advice if you intend to distribute the result of your build.
The hsdis library will be automatically loaded by Hotspot when you use the
diagnostic option -XX:+PrintAssembly. Note that since this is a diagnostic
option, you need to unlock these first, so in practice you activate it using
-XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly.
If using the LLVM backend on Windows, you need to be sure that the LLVM DLL file
(or files) can be found by hsdis. In practice, this means that you either need
to copy LLVM-C.DLL to a place on your PATH or the JDK bin directory, or
you need to augment your PATH variable to also point to where you installed
LLVM (like C:\LLVM\bin).
More information is available at the HotSpot wiki.
To build this project using Capstone you need to have Capstone installed.
Typical ways of installation can be sudo apt install libcapstone-dev (on
Debian and derivatives), or brew install capstone (on macOS with Homebrew).
For Windows, you need to download the "Core Engine", and unzip it. See the
Capstone Download
page for
up-to-date download links.
This has been tested with Capstone v4.0.2, but earlier (and later) versions are also likely to work.
To build hsdis using Capstone, you must enable it in configure by bash configure --with-hsdis=capstone.
On Linux and macOS, the location Capstone can most often be auto-detected. If
this fails, or if you are building on Windows, you need to specify where
Capstone is located using --with-capstone=<path>. This path should point to
where you have extracted the Core Engine zip file.
To build this project using LLVM you need to have LLVM installed. Typical ways
of installation can be sudo apt install llvm (on Debian and derivatives), or
brew install llvm (on macOS with Homebrew). For Windows, see below.
This has been tested with LLVM v13.0.0, but earlier (and later) versions are also likely to work.
To build hsdis using LLVM, you must enable it in configure by bash configure --with-hsdis=llvm.
If llvm-config is not in your path, you will need to specify the LLVM home using
--with-llvm=<LLVM home>. Example: If your llvm-config is in ~/my-llvm/bin,
then you should use --with-llvm=~/my-llvm.
Getting a usable installation on Windows is trickier than on the other platforms. You can download (and patch) the official distribution, or you can build it yourself.
Links to the latest version of the official build is available at LLVMs
download page. Download the file
LLVM-nn.n.n-win64.exe, and run it to let it install itself. The default
installation location is C:\Program Files\LLVM. This is not ideal due to the
spaces in the path, so it is recommended to put it elsewhere (e.g. C:\LLVM).
For very unclear reasons, the official Windows build is missing almost all LLVM
include files. (At least this was the case up to and including LLVM 13.) You
will need to complement your installation with the proper include files. One way
to do this is to install LLVM in Cygwin. This will give you (apart from the Cygwin-based dll
files which are unusable with Visual Studio) a complete set of the
headers. These are located in /usr/include/llvm and /usr/include/llvm-c. Copy
these directories, with all their content, into $LLVM_HOME/include.
Alternatively, you can build LLVM yourself from source. This process is documented at the LLVM Visual Studio page.
Either which way, you must tell configure the location of your LLVM installation
using --with-llvm=<path to LLVM home>.
The llvm-config tool, which configure uses on other platforms to get the
proper compile and link flags to use, is unfortunately not usable on Windows. In
the official distribution, it is just missing. And the self-built version tend
to give broken and unusable output. Therefore configure uses heuristics to setup
proper flags to the compiler and linker. This was verified to work for LLVM v13,
but might be incorrect for other versions. Manual override of HSDIS_CFLAGS,
HSDIS_LDFLAGS and/or HSDIS_LIBS on the make command line might be needed in
that case.
To build this project using binutils you need a copy of GNU binutils to build against. It is known to work with binutils 2.37. Building against versions older than 2.29 is not supported. Download a copy of the software from FSF binutils page or one of its mirrors.
To build this library, you must enable building in configure by bash configure --with-hsdis=binutils.
You must also specify where binutils is located. To facilitate building, you can
point to a place where the (unpacked) binutils sources are located using
--with-binutils-src=<location>, and configure will build binutils for you. On
repeated runs, you can keep this command line option, since configure will
figure out that the binutils binaries are already present and skip building, or
you can replace it with --with-binutils=<location>.
If you have pre-built binutils binaries, you can point to them directly using
--with-binutils=<location>.
If you want to build hsdis with binutils provided by system (e.g. binutils-devel
from Fedora, binutils-dev from Ubuntu), you can pass --with-binutils=system.
system is available on Linux only.
On Windows, the normal Microsoft Visual Studio toolchain cannot build binutils.
Instead we need to use the mingw compiler. This is available as a cygwin
package. You need to install the gcc-core and mingw64-x86_64-gcc-core
packages (or mingw64-i686-gcc-core, if you want the 32-bit version) and
mingw64-x86_64-glib2.0.