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23 
24 
25 package org.graalvm.compiler.hotspot;
26 
27 import org.graalvm.compiler.serviceprovider.ServiceProvider;
28 
29 import jdk.vm.ci.hotspot.HotSpotVMEventListener;
30 import jdk.vm.ci.runtime.JVMCICompilerFactory;
31 import jdk.vm.ci.services.JVMCIServiceLocator;
32 
33 @ServiceProvider(JVMCIServiceLocator.class)
34 public final class HotSpotGraalJVMCIServiceLocator extends JVMCIServiceLocator {
35 
36     /**
37      * Holds the state shared between all {@link HotSpotGraalJVMCIServiceLocator} instances. This is
38      * necessary as a service provider instance is created each time the service is loaded.
39      */
40     private static final class Shared {
41         static final Shared SINGLETON = new Shared();
42 
getProvider(Class<T> service, HotSpotGraalJVMCIServiceLocator locator)43         <T> T getProvider(Class<T> service, HotSpotGraalJVMCIServiceLocator locator) {
44             if (service == JVMCICompilerFactory.class) {
45                 return service.cast(new HotSpotGraalCompilerFactory(locator));
46             } else if (service == HotSpotVMEventListener.class) {
47                 if (graalRuntime != null) {
48                     return service.cast(new HotSpotGraalVMEventListener(graalRuntime));
49                 }
50             }
51             return null;
52         }
53 
54         private HotSpotGraalRuntime graalRuntime;
55 
56         /**
57          * Notifies this object of the compiler created via {@link HotSpotGraalJVMCIServiceLocator}.
58          */
onCompilerCreation(HotSpotGraalCompiler compiler)59         void onCompilerCreation(HotSpotGraalCompiler compiler) {
60             assert this.graalRuntime == null : "only expect a single JVMCICompiler to be created";
61             this.graalRuntime = (HotSpotGraalRuntime) compiler.getGraalRuntime();
62         }
63     }
64 
65     @Override
getProvider(Class<T> service)66     public <T> T getProvider(Class<T> service) {
67         return Shared.SINGLETON.getProvider(service, this);
68     }
69 
70     /**
71      * Notifies this object of the compiler created via {@link HotSpotGraalJVMCIServiceLocator}.
72      */
73     @SuppressWarnings("static-method")
onCompilerCreation(HotSpotGraalCompiler compiler)74     void onCompilerCreation(HotSpotGraalCompiler compiler) {
75         Shared.SINGLETON.onCompilerCreation(compiler);
76     }
77 }
78