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* The Universal Permissive License (UPL), Version 1.0
*
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package org.graalvm.nativeimage;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import org.graalvm.nativeimage.impl.IsolateSupport;
import org.graalvm.word.UnsignedWord;
/**
* Support for the creation, access to, and tear-down of isolates.
*
* @since 19.0
*/
public final class Isolates {
private Isolates() {
}
/**
* An exception thrown in the context of managing isolates.
*
* @since 19.0
*/
public static final class IsolateException extends RuntimeException {
private static final long serialVersionUID = 1L;
/**
* Constructs a new exception with the specified detail message.
*
* @since 19.0
*/
public IsolateException(String message) {
super(message);
}
}
/**
* Parameters for the creation of an isolate.
*
* @see CreateIsolateParameters.Builder
*
* @since 19.0
*/
public static final class CreateIsolateParameters {
/**
* Builder for a {@link CreateIsolateParameters} instance.
*
* @since 19.0
*/
public static final class Builder {
private UnsignedWord reservedAddressSpaceSize;
private String auxiliaryImagePath;
private UnsignedWord auxiliaryImageReservedSpaceSize;
private final List arguments;
private ProtectionDomain protectionDomain = ProtectionDomain.NO_DOMAIN;
/**
* Creates a new builder with default values.
*
* @since 19.0
*/
public Builder() {
arguments = new ArrayList<>();
}
/**
* Sets the size in bytes for the reserved virtual address space of the new isolate.
*
* @since 19.0
*/
public Builder reservedAddressSpaceSize(UnsignedWord size) {
this.reservedAddressSpaceSize = size;
return this;
}
/**
* Sets the file path to an auxiliary image which should be loaded in addition to the
* main image, or {@code null} if no such image should be loaded.
*
* @since 20.1
*/
public Builder auxiliaryImagePath(String filePath) {
this.auxiliaryImagePath = filePath;
return this;
}
/**
* Sets the size in bytes of an address space to reserve for loading an auxiliary image
* in addition to the main image, or 0 if no space should be reserved.
*
* @since 20.1
*/
public Builder auxiliaryImageReservedSpaceSize(UnsignedWord size) {
this.auxiliaryImageReservedSpaceSize = size;
return this;
}
/**
* Appends an isolate argument. The syntax for arguments is the same as the one that is
* used on the command-line when starting Native Image (e.g., {@code
* -XX:+AutomaticReferenceHandling}). If the same argument is added multiple times, the
* last specified value will be used.
*
* @since 22.1
*/
public Builder appendArgument(String argument) {
this.arguments.add(argument);
return this;
}
/**
* Sets the {@link ProtectionDomain} for an isolate.
*
* @since 22.1
*/
public Builder setProtectionDomain(ProtectionDomain domain) {
this.protectionDomain = domain;
return this;
}
/**
* Produces the final {@link CreateIsolateParameters} with the values set previously by
* the builder methods.
*
* @since 19.0
*/
public CreateIsolateParameters build() {
return new CreateIsolateParameters(reservedAddressSpaceSize, auxiliaryImagePath, auxiliaryImageReservedSpaceSize, arguments, protectionDomain);
}
}
private static final CreateIsolateParameters DEFAULT = new Builder().build();
/**
* Returns a {@link CreateIsolateParameters} with all default values.
*
* @since 19.0
*/
public static CreateIsolateParameters getDefault() {
return DEFAULT;
}
private final UnsignedWord reservedAddressSpaceSize;
private final String auxiliaryImagePath;
private final UnsignedWord auxiliaryImageReservedSpaceSize;
private final List arguments;
private final ProtectionDomain protectionDomain;
private CreateIsolateParameters(UnsignedWord reservedAddressSpaceSize, String auxiliaryImagePath, UnsignedWord auxiliaryImageReservedSpaceSize, List arguments,
ProtectionDomain protectionDomain) {
this.reservedAddressSpaceSize = reservedAddressSpaceSize;
this.auxiliaryImagePath = auxiliaryImagePath;
this.auxiliaryImageReservedSpaceSize = auxiliaryImageReservedSpaceSize;
this.arguments = arguments;
this.protectionDomain = protectionDomain;
}
/**
* Returns the size in bytes for the reserved virtual address space of the new isolate.
*
* @since 19.0
*/
public UnsignedWord getReservedAddressSpaceSize() {
return reservedAddressSpaceSize;
}
/**
* Returns the file path to an auxiliary image which should be loaded in addition to the
* main image, or {@code null} if no such image should be loaded.
*
* @since 20.1
*/
public String getAuxiliaryImagePath() {
return auxiliaryImagePath;
}
/**
* Returns the size in bytes of an address space to reserve for loading an auxiliary image
* in addition to the main image, or 0 if no space should be reserved.
*
* @since 20.1
*/
public UnsignedWord getAuxiliaryImageReservedSpaceSize() {
return auxiliaryImageReservedSpaceSize;
}
/**
* Returns the list of additional isolate arguments.
*
* @since 22.1
*/
public List getArguments() {
return Collections.unmodifiableList(arguments);
}
/**
* Returns the memory protection domain to be used for an isolate.
*
* @since 22.1
*/
public ProtectionDomain getProtectionDomain() {
return protectionDomain;
}
}
/**
* Identifies a protection domain for an isolate. A protection domain may be used by a
* {@code MemoryProtectionKeyProvider} in connection with underlying MMU hardware such as Memory
* Protection Keys.
*
* @since 22.1
*
*/
public interface ProtectionDomain {
/**
* Do not use a protection domain.
*
* @since 22.1
*/
ProtectionDomain NO_DOMAIN = new ProtectionDomain() {
};
/**
* Creates a new protection domain if passed to the {@link Builder}.
*
* @since 22.1
*/
ProtectionDomain NEW_DOMAIN = new ProtectionDomain() {
};
}
/**
* Creates a new isolate with the passed {@linkplain CreateIsolateParameters parameters}. On
* success, the current thread is attached to the created isolate, and a pointer to its
* associated {@link IsolateThread} structure is returned.
*
* @param parameters Parameters for the creation of the isolate.
* @return A pointer to the structure that represents the current thread in the new isolate.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static IsolateThread createIsolate(CreateIsolateParameters parameters) throws IsolateException {
Objects.requireNonNull(parameters);
return ImageSingletons.lookup(IsolateSupport.class).createIsolate(parameters);
}
/**
* Attaches the current thread to the passed isolate. If the thread has already been attached,
* the call provides the thread's existing isolate thread structure.
*
* @param isolate The isolate to which to attach the current thread.
* @return A pointer to the structure representing the newly attached isolate thread.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static IsolateThread attachCurrentThread(Isolate isolate) throws IsolateException {
return ImageSingletons.lookup(IsolateSupport.class).attachCurrentThread(isolate);
}
/**
* Given an isolate to which the current thread is attached, returns the address of the thread's
* associated isolate thread structure. If the current thread is not attached to the passed
* isolate, returns {@code null}.
*
* @param isolate The isolate for which to retrieve the current thread's corresponding structure
* @return A pointer to the current thread's structure in the specified isolate or {@code null}
* if the thread is not attached to that isolate.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static IsolateThread getCurrentThread(Isolate isolate) throws IsolateException {
return ImageSingletons.lookup(IsolateSupport.class).getCurrentThread(isolate);
}
/**
* Given an isolate thread structure, determines to which isolate it belongs and returns the
* address of the isolate structure. May return {@code null} if the specified isolate thread
* structure is no longer valid.
*
* @param thread The isolate thread for which to retrieve the isolate.
* @return A pointer to the isolate, or {@code null}.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static Isolate getIsolate(IsolateThread thread) throws IsolateException {
return ImageSingletons.lookup(IsolateSupport.class).getIsolate(thread);
}
/**
* Detaches the passed isolate thread from its isolate and discards any state or context that is
* associated with it. At the time of the call, no code may still be executing in the isolate
* thread's context. The passed pointer is no longer valid after the method returns.
*
* @param thread The isolate thread to detach from its isolate.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static void detachThread(IsolateThread thread) throws IsolateException {
ImageSingletons.lookup(IsolateSupport.class).detachThread(thread);
}
/**
* Tears down an isolate. Given an {@link IsolateThread} for the current thread which must be
* attached to the isolate to be torn down, waits for any other attached threads to detach from
* the isolate, then discards the isolate's objects, threads, and any other state or context
* that is associated with it. The passed pointer is no longer valid after the method returns.
*
* @param thread {@link IsolateThread} of the current thread that is attached to the isolate
* which is to be torn down.
* @throws IsolateException on error.
*
* @since 19.0
*/
public static void tearDownIsolate(IsolateThread thread) throws IsolateException {
ImageSingletons.lookup(IsolateSupport.class).tearDownIsolate(thread);
}
}
