private void buildCopyStack(
List<StackManipulation> stack,
int iterations,
Method getMethod,
Method putMethod,
long stride)
throws NoSuchFieldException, NoSuchMethodException {
final Field unsafeField = UnsafeCopier.class.getDeclaredField("unsafe");
final StackManipulation copyStack =
new StackManipulation.Compound(
// unsafe.putLong(dest, destOffset, unsafe.getLong(src));
MethodVariableAccess.REFERENCE.loadOffset(0), // ALOAD 0 this
FieldAccess.forField(new FieldDescription.ForLoadedField(unsafeField))
.getter(), // GETFIELD
MethodVariableAccess.REFERENCE.loadOffset(1), // ALOAD 1 dest
MethodVariableAccess.LONG.loadOffset(4), // LLOAD 4 destOffset
MethodVariableAccess.REFERENCE.loadOffset(0), // ALOAD 0 this
FieldAccess.forField(new FieldDescription.ForLoadedField(unsafeField))
.getter(), // GETFIELD
MethodVariableAccess.LONG.loadOffset(2), // LLOAD 2 src
MethodInvocation.invoke(new MethodDescription.ForLoadedMethod(getMethod)),
MethodInvocation.invoke(new MethodDescription.ForLoadedMethod(putMethod)));
final StackManipulation incrementStack =
new StackManipulation.Compound(
// destOffset += 8; src += 8;
MethodVariableAccess.LONG.loadOffset(4), // LLOAD 4 destOffset
LongConstant.forValue(stride), // LDC 8 strideWidth
LongAdd.INSTANCE, // LADD
MethodVariableStore.LONG.storeOffset(4), // LSTORE 4
MethodVariableAccess.LONG.loadOffset(2), // LLOAD 2 src
LongConstant.forValue(stride), // LDC 8 strideWidth
LongAdd.INSTANCE, // LADD
MethodVariableStore.LONG.storeOffset(2) // LSTORE 2
);
for (int i = 0; i < iterations; i++) {
stack.add(copyStack);
stack.add(incrementStack);
}
}
private void buildSetupStack(List<StackManipulation> stack)
throws NoSuchFieldException, NoSuchMethodException {
final StackManipulation setupStack =
new StackManipulation.Compound(
LongConstant.forValue(offset), // LDC offset
MethodVariableStore.LONG.storeOffset(4) // LSTORE 4
);
stack.add(setupStack);
}