a Sample for Sparc backend

[Christian Thalinger]

> On Apr 23, 2016, at 8:34 PM, Bahram Yarahmadi <bahram.yarahmadi at gmail.com> wrote:
> 
> Hello guys,
> I want to generate code for different ISAs ( for example SPARC which is
> currently in graal code base) before migrating to old revisions ( my main
> target is PTX)
> I have written a very simple program ,that is :
>   RuntimeProvider runtimeProvider =
> Graal.getRequiredCapability(RuntimeProvider.class);
>   Backend backend = runtimeProvider.getBackend(SPARC.class);
>   Providers providers=backend.getProviders();
>   MetaAccess   metaAccess = providers.getMetaAccess();
>   CodeCache  codeCache = providers.getCodeCache();
>    ResolvedJavaMethod method = findMethod(ScrachTest.class,
> "AddTwoNumbers"); //ScrachTest.class is a simple class with a method in it
>    StructuredGraph graph = new StructuredGraph(method,
> AllowAssumptions.YES);
>    PhaseSuite<HighTierContext> graphBuilderSuite =
> backend.getSuites().getDefaultGraphBuilderSuite();
>        Suites suites = backend.getSuites().getDefaultSuites();
>        LIRSuites lirSuites = backend.getSuites().getDefaultLIRSuites();
> 
>        OptimisticOptimizations optimisticOpts =
> OptimisticOptimizations.ALL;
>        ProfilingInfo profilingInfo = graph.getProfilingInfo(method);
>        CompilationResult compilationResult = new CompilationResult();
>        CompilationResultBuilderFactory factory =
> CompilationResultBuilderFactory.Default;
>         GraalCompiler.compileGraph(graph, method, providers, backend,
> graphBuilderSuite,
>         optimisticOpts, profilingInfo, suites, lirSuites,
> compilationResult, factory);
>         CompiledCode compiledCode = backend.createCompiledCode(method,
> compilationResult);
>        InstalledCode installedCode = codeCache.addCode(method,
> compiledCode, null, null);
> When I want to test my program I get these Errors
> (com.oracle.graal.compiler.test.tutorial.GraalTutorial)
> java.lang.NullPointerException
> at
> com.oracle.graal.compiler.test.tutorial.InvokeGraal.<init>(InvokeGraal.java:76)
> at
> com.oracle.graal.compiler.test.tutorial.GraalTutorial.<init>(GraalTutorial.java:65)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> at
> org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:195)
> at
> org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:244)
> 
> Could you please tell me how can I generate code for different ISAs ?

The simplest way, which I used when working on the AArch64 port, is to define the os.arch system property:

-Dos.arch=sparcv9

That way you can JIT compile methods for a different architecture on, let’s say, x86.  Obviously this will bail out when the JVM wants to install the compiled code in the code cache but it gets you a long way.

> 
> Thanks
> 
> Regards