org.graalvm.compiler.hotspot

Class CompilationContext

java.lang.Object

org.graalvm.compiler.hotspot.CompilationContext

All Implemented Interfaces:

AutoCloseable

public class CompilationContext
extends Object
implements AutoCloseable

A context for scoping the lifetime of foreign objects. The need for this mechanism is best explained with an example. When folding a GETFIELD bytecode denoting a final static non-primitive field, libgraal can create a JavaConstant wrapping a handle to the field's value in the HotSpot heap. This handle must be released before HotSpot can reclaim the object it references. Performing a compilation in the scope of a local context ensures the handle is released once the compilation completes, allowing the HotSpot GC to subsequently reclaim the HotSpot object. When libgraal creates data structures that outlive a single compilation and may contain foreign object references (e.g. snippet graphs), it must enter the global context. Foreign object handles created in the global context are only released once their JavaConstant wrappers are reclaimed by the libgraal GC. CompilationContexts have no impact on JavaConstants that do not encapsulate a foreign object reference. The object returned by HotSpotGraalServices.enterGlobalCompilationContext() or HotSpotGraalServices.openLocalCompilationContext(java.lang.Object) should be used in a try-with-resources statement. Failure to close a context will almost certainly result in foreign objects being leaked.

Method Summary

Modifier and Type	Method and Description
void	close()

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

close

public void close()

Specified by:

close in interface AutoCloseable