package java.lang.invoke;
import jdk.internal.access.foreign.MemorySegmentProxy;
import jdk.internal.misc.ScopedMemoryAccess;
import jdk.internal.vm.annotation.ForceInline;
import java.lang.ref.Reference;
import java.util.Objects;
import static java.lang.invoke.MethodHandleStatics.UNSAFE;
final class MemoryAccessVarHandleByteHelper extends MemoryAccessVarHandleBase {
static final boolean BE = UNSAFE.isBigEndian();
static final ScopedMemoryAccess SCOPED_MEMORY_ACCESS = ScopedMemoryAccess.getScopedMemoryAccess();
static final int VM_ALIGN = Byte.BYTES - 1;
static final VarForm FORM = new VarForm(MemoryAccessVarHandleByteHelper.class, MemorySegmentProxy.class, byte.class, long.class);
MemoryAccessVarHandleByteHelper(boolean skipAlignmentMaskCheck, boolean be, long length, long alignmentMask, boolean exact) {
super(FORM, skipAlignmentMaskCheck, be, length, alignmentMask, exact);
}
@Override
final MethodType accessModeTypeUncached(VarHandle.AccessType accessType) {
return accessType.accessModeType(MemorySegmentProxy.class, byte.class, long.class);
}
@Override
public MemoryAccessVarHandleByteHelper withInvokeExactBehavior() {
return hasInvokeExactBehavior() ?
this :
new MemoryAccessVarHandleByteHelper(skipAlignmentMaskCheck, be, length, alignmentMask, true);
}
@Override
public MemoryAccessVarHandleByteHelper withInvokeBehavior() {
return !hasInvokeExactBehavior() ?
this :
new MemoryAccessVarHandleByteHelper(skipAlignmentMaskCheck, be, length, alignmentMask, false);
}
@ForceInline
static byte convEndian(boolean big, byte n) {
return n;
}
@ForceInline
static MemorySegmentProxy checkAddress(Object obb, long offset, long length, boolean ro) {
MemorySegmentProxy oo = (MemorySegmentProxy)Objects.requireNonNull(obb);
oo.checkAccess(offset, length, ro);
return oo;
}
@ForceInline
static long offset(boolean skipAlignmentMaskCheck, MemorySegmentProxy bb, long offset, long alignmentMask) {
long address = offsetNoVMAlignCheck(skipAlignmentMaskCheck, bb, offset, alignmentMask);
if ((address & VM_ALIGN) != 0) {
throw MemoryAccessVarHandleBase.newIllegalStateExceptionForMisalignedAccess(address);
}
return address;
}
@ForceInline
static long offsetNoVMAlignCheck(boolean skipAlignmentMaskCheck, MemorySegmentProxy bb, long offset, long alignmentMask) {
long base = bb.unsafeGetOffset();
long address = base + offset;
if (skipAlignmentMaskCheck) {
if ((base & alignmentMask) != 0) {
throw MemoryAccessVarHandleBase.newIllegalStateExceptionForMisalignedAccess(address);
}
} else {
if ((address & alignmentMask) != 0) {
throw MemoryAccessVarHandleBase.newIllegalStateExceptionForMisalignedAccess(address);
}
}
return address;
}
@ForceInline
static byte get(VarHandle ob, Object obb, long base) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, true);
return SCOPED_MEMORY_ACCESS.getByte(bb.scope(),
bb.unsafeGetBase(),
offsetNoVMAlignCheck(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask));
}
@ForceInline
static void set(VarHandle ob, Object obb, long base, byte value) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, false);
SCOPED_MEMORY_ACCESS.putByte(bb.scope(),
bb.unsafeGetBase(),
offsetNoVMAlignCheck(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask),
value);
}
@ForceInline
static byte getVolatile(VarHandle ob, Object obb, long base) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, true);
return convEndian(handle.be,
SCOPED_MEMORY_ACCESS.getByteVolatile(bb.scope(),
bb.unsafeGetBase(),
offset(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask)));
}
@ForceInline
static void setVolatile(VarHandle ob, Object obb, long base, byte value) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, false);
SCOPED_MEMORY_ACCESS.putByteVolatile(bb.scope(),
bb.unsafeGetBase(),
offset(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask),
convEndian(handle.be, value));
}
@ForceInline
static byte getAcquire(VarHandle ob, Object obb, long base) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, true);
return convEndian(handle.be,
SCOPED_MEMORY_ACCESS.getByteAcquire(bb.scope(),
bb.unsafeGetBase(),
offset(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask)));
}
@ForceInline
static void setRelease(VarHandle ob, Object obb, long base, byte value) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, false);
SCOPED_MEMORY_ACCESS.putByteRelease(bb.scope(),
bb.unsafeGetBase(),
offset(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask),
convEndian(handle.be, value));
}
@ForceInline
static byte getOpaque(VarHandle ob, Object obb, long base) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, true);
return convEndian(handle.be,
SCOPED_MEMORY_ACCESS.getByteOpaque(bb.scope(),
bb.unsafeGetBase(),
offset(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask)));
}
@ForceInline
static void setOpaque(VarHandle ob, Object obb, long base, byte value) {
MemoryAccessVarHandleBase handle = (MemoryAccessVarHandleBase)ob;
MemorySegmentProxy bb = checkAddress(obb, base, handle.length, false);
SCOPED_MEMORY_ACCESS.putByteOpaque(bb.scope(),
bb.unsafeGetBase(),
offset(handle.skipAlignmentMaskCheck, bb, base, handle.alignmentMask),
convEndian(handle.be, value));
}
}