119 lines
4.3 KiB
C#
119 lines
4.3 KiB
C#
/*******************************************************************/
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/* WARNING */
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/* This file should be identical in the Bartok and Singularity */
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/* depots. Master copy resides in Bartok Depot. Changes should be */
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/* made to Bartok Depot and propagated to Singularity Depot. */
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/*******************************************************************/
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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namespace System.GCs
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{
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using Microsoft.Bartok.Runtime;
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using System.Runtime.CompilerServices;
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internal class ObjectLayout
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{
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// Tags on GC information provided by compiler.
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internal const uint SPARSE_TAG = 0x1;
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internal const uint DENSE_TAG = 0x3;
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internal const uint PTR_VECTOR_TAG = 0x5;
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internal const uint OTHER_VECTOR_TAG = 0x7;
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internal const uint PTR_ARRAY_TAG = 0x9;
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internal const uint OTHER_ARRAY_TAG = 0xb;
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internal const uint STRING_TAG = 0xd;
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internal const uint RESERVED_TAG = 0xf;
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internal abstract class ObjectVisitor {
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// Must return the size of the visited object.
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internal abstract UIntPtr Visit(Object obj);
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}
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// Returns object size in bytes
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[ManualRefCounts]
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[NoHeapAllocation]
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internal static UIntPtr ObjectSize(VTable vtable)
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{
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uint baseLength = unchecked((uint)vtable.baseLength);
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VTable.Assert(Util.UIntPtrPad((UIntPtr) baseLength) == baseLength);
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return (UIntPtr)baseLength;
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}
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// Returns string size in bytes
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[ManualRefCounts]
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[NoHeapAllocation]
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internal static unsafe UIntPtr StringSize(VTable vtable,
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uint arrayLength)
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{
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uint baseLength = unchecked((uint) vtable.baseLength);
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uint size = (baseLength + sizeof(char)*arrayLength);
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return Util.UIntPtrPad((UIntPtr) size);
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}
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// Returns array size in bytes
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[ManualRefCounts]
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[NoInline]
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[NoHeapAllocation]
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internal static UIntPtr ArraySize(VTable vtable, uint numElements)
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{
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UIntPtr baseLength = (UIntPtr)
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unchecked((uint) vtable.baseLength);
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UIntPtr elementSize = (UIntPtr)
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unchecked((uint) vtable.arrayElementSize);
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UIntPtr size = baseLength + elementSize * numElements;
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return Util.UIntPtrPad(size);
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}
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// Returns object size in bytes
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[ManualRefCounts]
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[NoHeapAllocation]
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internal unsafe static UIntPtr Sizeof(Object obj) {
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return ObjectSize(Magic.addressOf(obj), obj.vtable);
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}
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[ManualRefCounts]
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[NoHeapAllocation]
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internal unsafe static UIntPtr ObjectSize(UIntPtr objectBase,
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VTable vtable)
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{
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uint objectTag =
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unchecked((uint) vtable.pointerTrackingMask) & 0xf;
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switch (objectTag) {
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case SPARSE_TAG:
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case DENSE_TAG: {
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return ObjectSize(vtable);
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}
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case PTR_VECTOR_TAG:
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case OTHER_VECTOR_TAG: {
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uint length = *(uint*) (objectBase + PostHeader.Size);
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return ArraySize(vtable, length);
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}
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case PTR_ARRAY_TAG:
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case OTHER_ARRAY_TAG: {
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uint length =
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*(uint*)(objectBase + PostHeader.Size + sizeof(uint));
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return ArraySize(vtable, length);
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}
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case STRING_TAG: {
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uint length = *(uint*) (objectBase + PostHeader.Size);
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return StringSize(vtable, length);
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}
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case RESERVED_TAG: {
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VTable.Assert(false, "RESERVED_TAG was used!");
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return UIntPtr.Zero;
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}
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default: {
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// escape case
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return ObjectSize(vtable);
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}
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}
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}
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}
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}
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