org.graalvm.nativeimage.c.function.CFunction Maven / Gradle / Ivy
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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* The Universal Permissive License (UPL), Version 1.0
*
* Subject to the condition set forth below, permission is hereby granted to any
* person obtaining a copy of this software, associated documentation and/or
* data (collectively the "Software"), free of charge and under any and all
* copyright rights in the Software, and any and all patent rights owned or
* freely licensable by each licensor hereunder covering either (i) the
* unmodified Software as contributed to or provided by such licensor, or (ii)
* the Larger Works (as defined below), to deal in both
*
* (a) the Software, and
*
* (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
* one is included with the Software each a "Larger Work" to which the Software
* is contributed by such licensors),
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* Software and the Larger Work(s), and to sublicense the foregoing rights on
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*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
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package org.graalvm.nativeimage.c.function;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.graalvm.nativeimage.c.CContext;
/**
* Denotes a {@code static native} method that calls directly from Java to C, without following the
* JNI protocol. This means that there are no artificial additional parameters such as the JNI
* environment passed, and no marshaling or processing of arguments (such as creating handles for
* objects) is performed.
*
* Parameter and return types must not be Java reference types; only primitive Java values and Word
* values are allowed. If a Word value is passed that points to a Java object, no guarantees are
* taken regarding its integrity as a pointer.
*
* The class containing the annotated method must be annotated with {@link CContext}.
*
* @since 1.0
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface CFunction {
/**
* Describes the thread state transition performed when the C function is invoked.
*
* @since 1.0
*/
enum Transition {
/**
* The thread state is transitioned from Java to C, and the Java parts of the stack are made
* walkable. The C code can block and call back to Java.
*
* @since 1.0
*/
TO_NATIVE,
/**
* No prologue and epilogue is emitted. The C code must not block and must not call back to
* Java. Also, long running C code delays safepoints (and therefore garbage collection) of
* other threads until the call returns.
*
* @since 1.0
*/
NO_TRANSITION,
}
/**
* The symbol name to use to link this method. If no value is specified, the name of the method
* (without name mangling or a class name prefix) is used.
*
* @since 1.0
*/
String value() default "";
/**
* The Java-to-C thread transition code used when calling the function.
*
* @since 1.0
*/
Transition transition() default Transition.TO_NATIVE;
}