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8234049: Implementation of Memory Access API (Incubator)

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Co-authored-by: Vlaidmir Ivanov <vladimir.x.ivanov@oracle.com>
Reviewed-by: alanb, psandoz, chegar, rriggs, plevart, briangoetz, jrose, adinn, vlivanov
This commit is contained in:
Jorn Vernee 2019-12-12 22:59:57 +00:00 • committed by Maurizio Cimadamore
parent 7cdecd8981
commit 8f4f088a12
59 changed files with 7849 additions and 147 deletions
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49
src/java.base/share/classes/java/nio/Buffer.java
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@ -28,7 +28,9 @@ package java.nio;
import jdk.internal.HotSpotIntrinsicCandidate;
import jdk.internal.access.JavaNioAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.access.foreign.MemorySegmentProxy;
import jdk.internal.misc.Unsafe;
import jdk.internal.vm.annotation.ForceInline;
import java.util.Spliterator;
@ -213,13 +215,26 @@ public abstract class Buffer {
// NOTE: hoisted here for speed in JNI GetDirectBufferAddress
long address;
// Used by buffers generated by the memory access API (JEP-370)
final MemorySegmentProxy segment;
// Creates a new buffer with given address and capacity.
//
Buffer(long addr, int cap, MemorySegmentProxy segment) {
this.address = addr;
this.capacity = cap;
this.segment = segment;
}
// Creates a new buffer with the given mark, position, limit, and capacity,
// after checking invariants.
//
Buffer(int mark, int pos, int lim, int cap) { // package-private
Buffer(int mark, int pos, int lim, int cap, MemorySegmentProxy segment) { // package-private
if (cap < 0)
throw createCapacityException(cap);
this.capacity = cap;
this.segment = segment;
limit(lim);
position(pos);
if (mark >= 0) {
@ -731,6 +746,13 @@ public abstract class Buffer {
mark = -1;
}
@ForceInline
final void checkSegment() {
if (segment != null) {
segment.checkValidState();
}
}
static {
// setup access to this package in SharedSecrets
SharedSecrets.setJavaNioAccess(
@ -739,6 +761,31 @@ public abstract class Buffer {
public JavaNioAccess.BufferPool getDirectBufferPool() {
return Bits.BUFFER_POOL;
}
@Override
public ByteBuffer newDirectByteBuffer(long addr, int cap, Object obj, MemorySegmentProxy segment) {
return new DirectByteBuffer(addr, cap, obj, segment);
}
@Override
public ByteBuffer newHeapByteBuffer(byte[] hb, int offset, int capacity, MemorySegmentProxy segment) {
return new HeapByteBuffer(hb, offset, capacity, segment);
}
@Override
public Object getBufferBase(ByteBuffer bb) {
return bb.base();
}
@Override
public long getBufferAddress(ByteBuffer bb) {
return bb.address;
}
@Override
public void checkSegment(Buffer buffer) {
buffer.checkSegment();
}
});
}