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8254162: Implementation of Foreign-Memory Access API (Third Incubator)

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Reviewed-by: erikj, psandoz, alanb
This commit is contained in:
Maurizio Cimadamore 2020-11-12 16:37:23 +00:00
parent c6ab0fdb15
commit 3e70aac5cc
82 changed files with 6038 additions and 2837 deletions
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57
src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java
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@ -1769,40 +1769,9 @@ abstract class MethodHandleImpl {
}
@Override
public VarHandle memoryAccessVarHandle(Class<?> carrier, long alignmentMask,
ByteOrder order, long offset, long[] strides) {
return VarHandles.makeMemoryAddressViewHandle(carrier, alignmentMask, order, offset, strides);
}
@Override
public Class<?> memoryAddressCarrier(VarHandle handle) {
return checkMemoryAccessHandle(handle).carrier();
}
@Override
public long memoryAddressAlignmentMask(VarHandle handle) {
return checkMemoryAccessHandle(handle).alignmentMask;
}
@Override
public ByteOrder memoryAddressByteOrder(VarHandle handle) {
return checkMemoryAccessHandle(handle).be ?
ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN;
}
@Override
public long memoryAddressOffset(VarHandle handle) {
return checkMemoryAccessHandle(handle).offset;
}
@Override
public long[] memoryAddressStrides(VarHandle handle) {
return checkMemoryAccessHandle(handle).strides();
}
@Override
public boolean isMemoryAccessVarHandle(VarHandle handle) {
return asMemoryAccessVarHandle(handle) != null;
public VarHandle memoryAccessVarHandle(Class<?> carrier, boolean skipAlignmentMaskCheck, long alignmentMask,
ByteOrder order) {
return VarHandles.makeMemoryAddressViewHandle(carrier, skipAlignmentMaskCheck, alignmentMask, order);
}
@Override
@ -1834,26 +1803,6 @@ abstract class MethodHandleImpl {
public VarHandle insertCoordinates(VarHandle target, int pos, Object... values) {
return VarHandles.insertCoordinates(target, pos, values);
}
private MemoryAccessVarHandleBase asMemoryAccessVarHandle(VarHandle handle) {
if (handle instanceof MemoryAccessVarHandleBase) {
return (MemoryAccessVarHandleBase)handle;
} else if (handle.target() instanceof MemoryAccessVarHandleBase) {
// skip first adaptation, since we have to step over MemoryAddressProxy
// see JDK-8237349
return (MemoryAccessVarHandleBase)handle.target();
} else {
return null;
}
}
private MemoryAccessVarHandleBase checkMemoryAccessHandle(VarHandle handle) {
MemoryAccessVarHandleBase base = asMemoryAccessVarHandle(handle);
if (base == null) {
throw new IllegalArgumentException("Not a memory access varhandle: " + handle);
}
return base;
}
});
}