/*
* Copyright (c) 2016, 2020, 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
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.graalvm.nativeimage;
import org.graalvm.nativeimage.impl.UnmanagedMemorySupport;
import org.graalvm.word.PointerBase;
import org.graalvm.word.UnsignedWord;
import org.graalvm.word.WordFactory;
Contains static methods that allow allocate/free of unmanaged memory, i.e., memory that is not
under the control of the garbage collector. In a typical C environment, these are the malloc/free
functions of the standard C library, however this class makes no assumptions or guarantees about
how the memory is managed. In particular, it is not allowed to free memory returned by these
allocation function directly using the standard C library (or vice versa).
Since: 19.0
/**
* Contains static methods that allow allocate/free of unmanaged memory, i.e., memory that is not
* under the control of the garbage collector. In a typical C environment, these are the malloc/free
* functions of the standard C library, however this class makes no assumptions or guarantees about
* how the memory is managed. In particular, it is not allowed to free memory returned by these
* allocation function directly using the standard C library (or vice versa).
*
* @since 19.0
*/
public final class UnmanagedMemory {
private UnmanagedMemory() {
}
Allocates size bytes of unmanaged memory. The content of the memory is undefined. If size is 0, the method is allowed but not required to return the null pointer. This method never returns a the null pointer, but instead throws a OutOfMemoryError when allocation fails.
Since: 19.0
/**
* Allocates {@code size} bytes of unmanaged memory. The content of the memory is undefined.
* <p>
* If {@code size} is 0, the method is allowed but not required to return the null pointer. This
* method never returns a the null pointer, but instead throws a {@link OutOfMemoryError} when
* allocation fails.
*
* @since 19.0
*/
public static <T extends PointerBase> T malloc(UnsignedWord size) {
T result = ImageSingletons.lookup(UnmanagedMemorySupport.class).malloc(size);
if (result.isNull()) {
throw new OutOfMemoryError("malloc of unmanaged memory");
}
return result;
}
Allocates size bytes of unmanaged memory. The content of the memory is undefined. If size is 0, the method is allowed but not required to return the null pointer. This method never returns a the null pointer, but instead throws a OutOfMemoryError when allocation fails.
Since: 19.0
/**
* Allocates {@code size} bytes of unmanaged memory. The content of the memory is undefined.
* <p>
* If {@code size} is 0, the method is allowed but not required to return the null pointer. This
* method never returns a the null pointer, but instead throws a {@link OutOfMemoryError} when
* allocation fails.
*
* @since 19.0
*/
public static <T extends PointerBase> T malloc(int size) {
return malloc(WordFactory.unsigned(size));
}
Allocates size bytes of unmanaged memory. The content of the memory is set to 0. If size is 0, the method is allowed but not required to return the null pointer. This method never returns a the null pointer, but instead throws a OutOfMemoryError when allocation fails.
Since: 19.0
/**
* Allocates {@code size} bytes of unmanaged memory. The content of the memory is set to 0.
* <p>
* If {@code size} is 0, the method is allowed but not required to return the null pointer. This
* method never returns a the null pointer, but instead throws a {@link OutOfMemoryError} when
* allocation fails.
*
* @since 19.0
*/
public static <T extends PointerBase> T calloc(UnsignedWord size) {
T result = ImageSingletons.lookup(UnmanagedMemorySupport.class).calloc(size);
if (result.isNull()) {
throw new OutOfMemoryError("calloc of unmanaged memory");
}
return result;
}
Allocates size bytes of unmanaged memory. The content of the memory is set to 0. If size is 0, the method is allowed but not required to return the null pointer. This method never returns a the null pointer, but instead throws a OutOfMemoryError when allocation fails.
Since: 19.0
/**
* Allocates {@code size} bytes of unmanaged memory. The content of the memory is set to 0.
* <p>
* If {@code size} is 0, the method is allowed but not required to return the null pointer. This
* method never returns a the null pointer, but instead throws a {@link OutOfMemoryError} when
* allocation fails.
*
* @since 19.0
*/
public static <T extends PointerBase> T calloc(int size) {
return calloc(WordFactory.unsigned(size));
}
Changes the size of the provided unmanaged memory to size bytes of unmanaged memory. If the new size is larger than the old size, the content of the additional memory is undefined. If size is 0, the method is allowed but not required to return the null pointer. This method never returns a the null pointer, but instead throws a OutOfMemoryError when allocation fails.
Since: 19.0
/**
* Changes the size of the provided unmanaged memory to {@code size} bytes of unmanaged memory.
* If the new size is larger than the old size, the content of the additional memory is
* undefined.
* <p>
* If {@code size} is 0, the method is allowed but not required to return the null pointer. This
* method never returns a the null pointer, but instead throws a {@link OutOfMemoryError} when
* allocation fails.
*
* @since 19.0
*/
public static <T extends PointerBase> T realloc(T ptr, UnsignedWord size) {
T result = ImageSingletons.lookup(UnmanagedMemorySupport.class).realloc(ptr, size);
if (result.isNull()) {
throw new OutOfMemoryError("realloc of unmanaged memory");
}
return result;
}
Frees unmanaged memory that was previously allocated using methods of this class.
Since: 19.0
/**
* Frees unmanaged memory that was previously allocated using methods of this class.
*
* @since 19.0
*/
public static void free(PointerBase ptr) {
ImageSingletons.lookup(UnmanagedMemorySupport.class).free(ptr);
}
}