Graal and Hotspot

[Gilles Duboscq]

Where configuration 1 defines both GRAAL and GRAALVM, configuration 2 to
defines only GRAAL and configuration 3 defines none.


On Wed, Feb 13, 2013 at 12:57 AM, Doug Simon @ Oracle <doug.simon at oracle.com
> wrote:

> In the C++ HotSpot code, Graal is a(nother) subclass of AbstractCompiler.
> Most of its code resides in these files/directories:
>
> src/share/vm/graal
> src/cpu/x86/vm/graal
> src/cpu/sparc/vm/graal
>
> That is, we've tried to match the code placement conventions of c1 and
> opto as much as possible.
>
> The VM can be built in a number configurations:
>
> 1. To exclusively use Graal for servicing compilation requests (e.g., upon
> counter overflow for hot methods in the interpreter). In this
> configuration, c1 and c2 are completely omitted from the VM binary. This
> configuration is built with the 'mx build' command and is run with the 'mx
> vm <VM options> class <args>' command.
> 2. To have the Graal extension points in the binary available so that
> Graal can be used for explicit compilation and code installation.  In this
> configuration, c1 and c2 are present and are used for VM requested
> compilations. That is, the VM is almost like a stock HotSpot build except
> that the Graal compiler can be used from Java code. For example, look at
> com.oracle.graal.compiler.test.CompiledMethodTest. This configuration is
> built with the 'mx --vm server build' command and is run with the 'mx --vm
> server vm <VM options> class <args>' command.
> 3. A stock HotSpot build with none of the Graal code included. This
> configuration is built with the 'env OMIT_GRAAL= mx --vm server build'
> command and is run with the 'mx --server vm <VM options> class <args>'
> command. This cannot coexist with config 2 and so you need to issue a 'mx
> clean --no-java' command when switching between config 2 and 3.
>
> For the most part, we have guarded all Graal modifications to the VM with
> '#ifdef GRAAL' or '#ifdef GRAALVM'.
>
> -Doug
>
> On Feb 13, 2013, at 7:49 AM, "Venkatachalam, Vasanth" <
> Vasanth.Venkatachalam at amd.com> wrote:
>
> > Hi,
> >
> > The Graal webpage says that the Graal VM is a modified version of
> Hotspot that uses Graal as the compiler instead of C1 or C2.
> >
> > Can someone explain at a high-level which components of Hotspot are
> intact and which ones have been modified?
> > I see a number of API routines relating to hotspot
> (com.oracle.graal.hotspot.server).
> >
> > Vasanth
> >
> >
> >
> >
>
>