本文整理匯總了Java中sun.misc.Unsafe.ARRAY_BYTE_INDEX_SCALE屬性的典型用法代碼示例。如果您正苦於以下問題：Java Unsafe.ARRAY_BYTE_INDEX_SCALE屬性的具體用法？Java Unsafe.ARRAY_BYTE_INDEX_SCALE怎麽用？Java Unsafe.ARRAY_BYTE_INDEX_SCALE使用的例子？那麽, 這裏精選的屬性代碼示例或許可以為您提供幫助。您也可以進一步了解該屬性所在類sun.misc.Unsafe的用法示例。
在下文中一共展示了Unsafe.ARRAY_BYTE_INDEX_SCALE屬性的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: entryIndexForOffset
public static int entryIndexForOffset(long constantOffset, JavaKind expectedEntryKind, ResolvedJavaType componentType, int length) {
int baseOffset;
int indexScale;
switch (componentType.getJavaKind()) {
case Boolean:
baseOffset = Unsafe.ARRAY_BOOLEAN_BASE_OFFSET;
indexScale = Unsafe.ARRAY_BOOLEAN_INDEX_SCALE;
break;
case Byte:
baseOffset = Unsafe.ARRAY_BYTE_BASE_OFFSET;
indexScale = Unsafe.ARRAY_BYTE_INDEX_SCALE;
break;
case Short:
baseOffset = Unsafe.ARRAY_SHORT_BASE_OFFSET;
indexScale = Unsafe.ARRAY_SHORT_INDEX_SCALE;
break;
case Char:
baseOffset = Unsafe.ARRAY_CHAR_BASE_OFFSET;
indexScale = Unsafe.ARRAY_CHAR_INDEX_SCALE;
break;
case Int:
baseOffset = Unsafe.ARRAY_INT_BASE_OFFSET;
indexScale = Unsafe.ARRAY_INT_INDEX_SCALE;
break;
case Long:
baseOffset = Unsafe.ARRAY_LONG_BASE_OFFSET;
indexScale = Unsafe.ARRAY_LONG_INDEX_SCALE;
break;
case Float:
baseOffset = Unsafe.ARRAY_FLOAT_BASE_OFFSET;
indexScale = Unsafe.ARRAY_FLOAT_INDEX_SCALE;
break;
case Double:
baseOffset = Unsafe.ARRAY_DOUBLE_BASE_OFFSET;
indexScale = Unsafe.ARRAY_DOUBLE_INDEX_SCALE;
break;
case Object:
baseOffset = Unsafe.ARRAY_OBJECT_BASE_OFFSET;
indexScale = Unsafe.ARRAY_OBJECT_INDEX_SCALE;
break;
default:
return -1;
}
long offset;
if (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN && componentType.isPrimitive()) {
// On big endian, we do just get expect the type be right aligned in this memory slot
offset = constantOffset - (componentType.getJavaKind().getByteCount() - Math.min(componentType.getJavaKind().getByteCount(), 4 + expectedEntryKind.getByteCount()));
} else {
offset = constantOffset;
}
long index = offset - baseOffset;
if (index % indexScale != 0) {
return -1;
}
long elementIndex = index / indexScale;
if (elementIndex < 0 || elementIndex >= length) {
return -1;
}
return (int) elementIndex;
}