org.graalvm.nativeimage.c.struct.CPointerTo Maven / Gradle / Ivy
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/*
* Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
* 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),
*
* without restriction, including without limitation the rights to copy, create
* derivative works of, display, perform, and distribute the Software and make,
* use, sell, offer for sale, import, export, have made, and have sold the
* Software and the Larger Work(s), and to sublicense the foregoing rights on
* either these or other terms.
*
* This license is subject to the following condition:
*
* The above copyright notice and either this complete permission notice or at a
* minimum a reference to the UPL must be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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package org.graalvm.nativeimage.c.struct;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.graalvm.word.LocationIdentity;
import org.graalvm.word.PointerBase;
import org.graalvm.word.WordBase;
/**
* Denotes Java interface that imports a C pointer type. The interface must extend
* {@link PointerBase}, i.e., it is a word type. There is never a Java class that implements the
* interface.
*
* If the method has a non-void return type that is not the annotated interface, it is a read-method
* of the pointer. Calls of the method are replaced with a memory read. The possible signatures are
* {@code ValueType read([IntType index], [LocationIdentity locationIdentity]);}
*
* If the method has the return type void, it is a write-method of the pointer. Calls of the method
* are replaced with a memory write. The possible signatures are
* {@code void write([IntType index], ValueType value, [LocationIdentity locationIdentity]);}
*
* If the return type of the method is the annotated interface, it is an address computation for an
* array access. Calls of the method are replaced with address arithmetic. The possible signatures
* are {@code PointerType addressOf(IntType index);}
*
* The receiver is the pointer that is accessed, i.e., the base address of the memory access.
*
* The {@code ValueType} must be the Java-equivalent of the C type used in the pointer definition.
*
* The optional parameter {@code index} (always the first parameter when it is present) denotes an
* index, i.e., the receiver is treated as an array of the pointers. The type must be a primitive
* integer type or a {@link WordBase word type}. Address arithmetic is used to scale the index with
* the size of the value type.
*
* The optional parameter {@code locationIdentity} specifies the {@link LocationIdentity} to be used
* for the memory access. Two memory accesses with two different location identities are guaranteed
* to not alias. The parameter cannot be used together with the {@link UniqueLocationIdentity}
* annotation, which is another way of providing a location identity for the memory access.
*
* @since 1.0
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
public @interface CPointerTo {
/**
* The value type, as a reference to a Java interface that is either annotated with
* {@link CStruct} or {@link CPointerTo}.
*
* Exactly one of the properties {@link #value()} and {@link CPointerTo#nameOfCType()} must be
* specified.
*
* @since 1.0
*/
Class value() default WordBase.class;
/**
* The value type, as C type name.
*
* Exactly one of the properties {@link #value()} and {@link CPointerTo#nameOfCType()} must be
* specified.
*
* @since 1.0
*/
String nameOfCType() default "";
}