JDK 17 jdk.incubator.foreign.jmod - JDK Incubator Foreign
JDK 17 jdk.incubator.foreign.jmod is the JMOD file for JDK 17 HTTP Server module.
JDK 17 Incubator Foreign module compiled class files are stored in \fyicenter\jdk-17.0.5\jmods\jdk.incubator.foreign.jmod.
JDK 17 Incubator Foreign module compiled class files are also linked and stored in the \fyicenter\jdk-17.0.5\lib\modules JImage file.
JDK 17 Incubator Foreign module source code files are stored in \fyicenter\jdk-17.0.5\lib\src.zip\jdk.incubator.foreign.
You can click and view the content of each source code file in the list below.
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⏎ jdk/incubator/foreign/SequenceLayout.java
/*
* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package jdk.incubator.foreign;
import java.lang.constant.Constable;
import java.lang.constant.ConstantDescs;
import java.lang.constant.DynamicConstantDesc;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.OptionalLong;
/**
* A sequence layout. A sequence layout is used to denote a repetition of a given layout, also called the sequence layout's <em>element layout</em>.
* The repetition count, where it exists (e.g. for <em>finite</em> sequence layouts) is said to be the the sequence layout's <em>element count</em>.
* A finite sequence layout can be thought of as a group layout where the sequence layout's element layout is repeated a number of times
* that is equal to the sequence layout's element count. In other words this layout:
*
* <pre>{@code
MemoryLayout.sequenceLayout(3, MemoryLayout.valueLayout(32, ByteOrder.BIG_ENDIAN));
* }</pre>
*
* is equivalent to the following layout:
*
* <pre>{@code
MemoryLayout.structLayout(
MemoryLayout.valueLayout(32, ByteOrder.BIG_ENDIAN),
MemoryLayout.valueLayout(32, ByteOrder.BIG_ENDIAN),
MemoryLayout.valueLayout(32, ByteOrder.BIG_ENDIAN));
* }</pre>
*
* <p>
* This is a <a href="{@docRoot}/java.base/java/lang/doc-files/ValueBased.html">value-based</a>
* class; programmers should treat instances that are
* {@linkplain #equals(Object) equal} as interchangeable and should not
* use instances for synchronization, or unpredictable behavior may
* occur. For example, in a future release, synchronization may fail.
* The {@code equals} method should be used for comparisons.
*
* <p> Unless otherwise specified, passing a {@code null} argument, or an array argument containing one or more {@code null}
* elements to a method in this class causes a {@link NullPointerException NullPointerException} to be thrown. </p>
*
* @implSpec
* This class is immutable and thread-safe.
*/
public final class SequenceLayout extends AbstractLayout implements MemoryLayout {
private final OptionalLong elemCount;
private final MemoryLayout elementLayout;
SequenceLayout(OptionalLong elemCount, MemoryLayout elementLayout) {
this(elemCount, elementLayout, elementLayout.bitAlignment(), Map.of());
}
SequenceLayout(OptionalLong elemCount, MemoryLayout elementLayout, long alignment, Map<String, Constable> attributes) {
super(elemCount.isPresent() && AbstractLayout.optSize(elementLayout).isPresent() ?
OptionalLong.of(elemCount.getAsLong() * elementLayout.bitSize()) :
OptionalLong.empty(), alignment, attributes);
this.elemCount = elemCount;
this.elementLayout = elementLayout;
}
/**
* Returns the element layout associated with this sequence layout.
*
* @return The element layout associated with this sequence layout.
*/
public MemoryLayout elementLayout() {
return elementLayout;
}
/**
* Returns the element count of this sequence layout (if any).
*
* @return the element count of this sequence layout (if any).
*/
public OptionalLong elementCount() {
return elemCount;
}
/**
* Obtains a new sequence layout with same element layout, alignment constraints and name as this sequence layout
* but with the new specified element count.
* @param elementCount the new element count.
* @return a new sequence with given element count.
* @throws IllegalArgumentException if {@code elementCount < 0}.
*/
public SequenceLayout withElementCount(long elementCount) {
AbstractLayout.checkSize(elementCount, true);
return new SequenceLayout(OptionalLong.of(elementCount), elementLayout, alignment, attributes);
}
/**
* Returns a new sequence layout where element layouts in the flattened projection of this
* sequence layout (see {@link #flatten()}) are re-arranged into one or more nested sequence layouts
* according to the provided element counts. This transformation preserves the layout size;
* that is, multiplying the provided element counts must yield the same element count
* as the flattened projection of this sequence layout.
* <p>
* For instance, given a sequence layout of the kind:
* <pre>{@code
var seq = MemoryLayout.sequenceLayout(4, MemoryLayout.sequenceLayout(3, MemoryLayouts.JAVA_INT));
* }</pre>
* calling {@code seq.reshape(2, 6)} will yield the following sequence layout:
* <pre>{@code
var reshapeSeq = MemoryLayout.sequenceLayout(2, MemoryLayout.sequenceLayout(6, MemoryLayouts.JAVA_INT));
* }</pre>
* <p>
* If one of the provided element count is the special value {@code -1}, then the element
* count in that position will be inferred from the remaining element counts and the
* element count of the flattened projection of this layout. For instance, a layout equivalent to
* the above {@code reshapeSeq} can also be computed in the following ways:
* <pre>{@code
var reshapeSeqImplicit1 = seq.reshape(-1, 6);
var reshapeSeqImplicit2 = seq.reshape(2, -1);
* }</pre>
* @param elementCounts an array of element counts, of which at most one can be {@code -1}.
* @return a new sequence layout where element layouts in the flattened projection of this
* sequence layout (see {@link #flatten()}) are re-arranged into one or more nested sequence layouts.
* @throws UnsupportedOperationException if this sequence layout does not have an element count.
* @throws IllegalArgumentException if two or more element counts are set to {@code -1}, or if one
* or more element count is {@code <= 0} (but other than {@code -1}) or, if, after any required inference,
* multiplying the element counts does not yield the same element count as the flattened projection of this
* sequence layout.
*/
public SequenceLayout reshape(long... elementCounts) {
Objects.requireNonNull(elementCounts);
if (elementCounts.length == 0) {
throw new IllegalArgumentException();
}
if (!elementCount().isPresent()) {
throw new UnsupportedOperationException("Cannot reshape a sequence layout whose element count is unspecified");
}
SequenceLayout flat = flatten();
long expectedCount = flat.elementCount().getAsLong();
long actualCount = 1;
int inferPosition = -1;
for (int i = 0 ; i < elementCounts.length ; i++) {
if (elementCounts[i] == -1) {
if (inferPosition == -1) {
inferPosition = i;
} else {
throw new IllegalArgumentException("Too many unspecified element counts");
}
} else if (elementCounts[i] <= 0) {
throw new IllegalArgumentException("Invalid element count: " + elementCounts[i]);
} else {
actualCount = elementCounts[i] * actualCount;
}
}
// infer an unspecified element count (if any)
if (inferPosition != -1) {
long inferredCount = expectedCount / actualCount;
elementCounts[inferPosition] = inferredCount;
actualCount = actualCount * inferredCount;
}
if (actualCount != expectedCount) {
throw new IllegalArgumentException("Element counts do not match expected size: " + expectedCount);
}
MemoryLayout res = flat.elementLayout();
for (int i = elementCounts.length - 1 ; i >= 0 ; i--) {
res = MemoryLayout.sequenceLayout(elementCounts[i], res);
}
return (SequenceLayout)res;
}
/**
* Returns a new, flattened sequence layout whose element layout is the first non-sequence
* element layout found by recursively traversing the element layouts of this sequence layout.
* This transformation preserves the layout size; nested sequence layout in this sequence layout will
* be dropped and their element counts will be incorporated into that of the returned sequence layout.
* For instance, given a sequence layout of the kind:
* <pre>{@code
var seq = MemoryLayout.sequenceLayout(4, MemoryLayout.sequenceLayout(3, MemoryLayouts.JAVA_INT));
* }</pre>
* calling {@code seq.flatten()} will yield the following sequence layout:
* <pre>{@code
var flattenedSeq = MemoryLayout.sequenceLayout(12, MemoryLayouts.JAVA_INT);
* }</pre>
* @return a new sequence layout with the same size as this layout (but, possibly, with different
* element count), whose element layout is not a sequence layout.
* @throws UnsupportedOperationException if this sequence layout, or one of the nested sequence layouts being
* flattened, does not have an element count.
*/
public SequenceLayout flatten() {
if (!elementCount().isPresent()) {
throw badUnboundSequenceLayout();
}
long count = elementCount().getAsLong();
MemoryLayout elemLayout = elementLayout();
while (elemLayout instanceof SequenceLayout) {
SequenceLayout elemSeq = (SequenceLayout)elemLayout;
count = count * elemSeq.elementCount().orElseThrow(this::badUnboundSequenceLayout);
elemLayout = elemSeq.elementLayout();
}
return MemoryLayout.sequenceLayout(count, elemLayout);
}
private UnsupportedOperationException badUnboundSequenceLayout() {
return new UnsupportedOperationException("Cannot flatten a sequence layout whose element count is unspecified");
}
@Override
public String toString() {
return decorateLayoutString(String.format("[%s:%s]",
elemCount.isPresent() ? elemCount.getAsLong() : "", elementLayout));
}
@Override
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!super.equals(other)) {
return false;
}
if (!(other instanceof SequenceLayout)) {
return false;
}
SequenceLayout s = (SequenceLayout)other;
return elemCount.equals(s.elemCount) && elementLayout.equals(s.elementLayout);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), elemCount, elementLayout);
}
@Override
SequenceLayout dup(long alignment, Map<String, Constable> attributes) {
return new SequenceLayout(elementCount(), elementLayout, alignment, attributes);
}
@Override
boolean hasNaturalAlignment() {
return alignment == elementLayout.bitAlignment();
}
@Override
public Optional<DynamicConstantDesc<SequenceLayout>> describeConstable() {
return Optional.of(decorateLayoutConstant(elemCount.isPresent() ?
DynamicConstantDesc.ofNamed(ConstantDescs.BSM_INVOKE, "value",
CD_SEQUENCE_LAYOUT, MH_SIZED_SEQUENCE, elemCount.getAsLong(), elementLayout.describeConstable().get()) :
DynamicConstantDesc.ofNamed(ConstantDescs.BSM_INVOKE, "value",
CD_SEQUENCE_LAYOUT, MH_UNSIZED_SEQUENCE, elementLayout.describeConstable().get())));
}
//hack: the declarations below are to make javadoc happy; we could have used generics in AbstractLayout
//but that causes issues with javadoc, see JDK-8224052
/**
* {@inheritDoc}
*/
@Override
public SequenceLayout withName(String name) {
return (SequenceLayout)super.withName(name);
}
/**
* {@inheritDoc}
*/
@Override
public SequenceLayout withBitAlignment(long alignmentBits) {
return (SequenceLayout)super.withBitAlignment(alignmentBits);
}
/**
* {@inheritDoc}
*/
@Override
public SequenceLayout withAttribute(String name, Constable value) {
return (SequenceLayout)super.withAttribute(name, value);
}
}
⏎ jdk/incubator/foreign/SequenceLayout.java
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File name: jdk.incubator.foreign-17.0.5-src.zip File size: 168767 bytes Release date: 2022-09-13 Download
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