/// <summary>
/// 映射到绝对空间
/// </summary>
/// <param name="offset"></param>
/// <param name="from"></param>
/// <returns></returns>
public static uint MapToAbsolute(uint offset, MemoryTag from)
{
switch (from)
{
case MemoryTag.NULL:
return(NullAddress);
case MemoryTag.PRESERVED:
if (offset >= Preserved.SizeLimit)
{
throw new XiVMError("Cannot map to preserved space, exceeds max size");
}
return(offset + 1);
case MemoryTag.STACK:
if (offset >= Stack.SizeLimit)
{
throw new XiVMError("Cannot map to stack space, exceeds stack max size");
}
return((uint)(offset + 1 + Preserved.SizeLimit));
case MemoryTag.HEAP:
if (offset >= Heap.SizeLimit)
{
throw new XiVMError("Cannot map to heap space, exceeds heap max size");
}
return((uint)(offset + 1 + Preserved.SizeLimit + Stack.SizeLimit));
case MemoryTag.STATIC:
if (offset >= StaticArea.SizeLimit)
{
throw new XiVMError("Cannot map to static area, exceeds static area max size");
}
return((uint)(offset + 1 + Preserved.SizeLimit + Stack.SizeLimit + Heap.SizeLimit));
case MemoryTag.METHOD:
if (offset >= MethodArea.SizeLimit)
{
throw new XiVMError("Cannot map to method area, exceeds method area max size");
}
return((uint)(offset + 1 + Preserved.SizeLimit + Stack.SizeLimit + Heap.SizeLimit + StaticArea.SizeLimit));
default:
throw new NotImplementedException();
}
}
private static void MarkObject(uint addr)
{
MemoryTag tag = MemoryMap.MapToOffset(addr, out addr);
if (tag == MemoryTag.HEAP)
{
HeapData data = Heap.Singleton.GetData(addr);
data.GCInfo |= (uint)GCTag.GCMark;
uint typeInfo = data.TypeInfo;
if ((data.GCInfo & (uint)GCTag.ArrayMark) != 0)
{
// 是数组
if (typeInfo == (uint)VariableTypeTag.ADDRESS)
{
// 是地址数组
int len = BitConverter.ToInt32(data.Data, HeapData.MiscDataSize);
for (int i = 0; i < len; i++)
{
MarkObject(BitConverter.ToUInt32(data.Data, HeapData.ArrayOffsetMap(VariableType.AddressType.Size, i)));
}
}
}
else
{
// 是普通对象
ModuleLoader.Classes.TryGetValue(typeInfo, out VMClass vmClass);
foreach (var field in vmClass.Fields)
{
if (field.Type.Tag == VariableTypeTag.ADDRESS)
{
// 是地址
MarkObject(BitConverter.ToUInt32(data.Data, field.Offset));
}
}
}
}
}
