本文整理汇总了Java中sun.misc.Unsafe.ARRAY_BYTE_INDEX_SCALE属性的典型用法代码示例。如果您正苦于以下问题：Java Unsafe.ARRAY_BYTE_INDEX_SCALE属性的具体用法？Java Unsafe.ARRAY_BYTE_INDEX_SCALE怎么用？Java Unsafe.ARRAY_BYTE_INDEX_SCALE使用的例子？那么恭喜您, 这里精选的属性代码示例或许可以为您提供帮助。您也可以进一步了解该属性所在类sun.misc.Unsafe的用法示例。
在下文中一共展示了Unsafe.ARRAY_BYTE_INDEX_SCALE属性的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
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;
}