268 lines
11 KiB
C#
268 lines
11 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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//#define DEBUG_OFFSETTABLE
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namespace System.GCs {
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using Microsoft.Bartok.Runtime;
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using System.Threading;
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using System.Runtime.CompilerServices;
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[CCtorIsRunDuringStartup]
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internal class Verifier
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{
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internal abstract class StackVerifier {
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internal abstract
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void Verify(NonNullReferenceVisitor threadReferenceVisitor,
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Thread thread);
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}
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private NonNullReferenceVisitor referenceVisitor;
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private NonNullReferenceVisitor threadReferenceVisitor;
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private ObjectLayout.ObjectVisitor objectVisitor;
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private StackVerifier stackVerifier;
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internal static readonly NonNullReferenceVisitor genericReferenceVisitor;
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internal static readonly ObjectLayout.ObjectVisitor genericObjectVisitor;
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internal static readonly NonNullReferenceVisitor genericThreadReferenceVisitor;
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internal static readonly StackVerifier genericStackVerifier;
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internal static readonly Verifier bumpAllocatorVerifier;
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internal static readonly Verifier segregatedFreeListVerifier;
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static Verifier() {
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genericReferenceVisitor = new GenericReferenceVisitor();
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genericThreadReferenceVisitor =
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new GenericThreadReferenceVisitor();
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genericObjectVisitor =
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new GenericObjectVisitor(genericReferenceVisitor);
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genericStackVerifier = new GenericStackVerifier();
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bumpAllocatorVerifier = new Verifier(genericReferenceVisitor,
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genericThreadReferenceVisitor,
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genericObjectVisitor,
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genericStackVerifier);
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segregatedFreeListVerifier =
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new Verifier(genericReferenceVisitor,
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genericThreadReferenceVisitor,
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new SegregatedFreeList.ObjectVisitorWrapper(genericObjectVisitor),
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genericStackVerifier);
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}
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internal Verifier(NonNullReferenceVisitor referenceVisitor,
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NonNullReferenceVisitor threadReferenceVisitor,
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ObjectLayout.ObjectVisitor objectVisitor,
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StackVerifier stackVerifier) {
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this.referenceVisitor = referenceVisitor;;
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this.threadReferenceVisitor = threadReferenceVisitor;
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this.objectVisitor = objectVisitor;
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this.stackVerifier = stackVerifier;
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}
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public void VerifyHeap() {
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// Temporarily set the thread allocation point to the unused
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// space token, if necessary.
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Thread currentThread = Thread.CurrentThread;
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VerifyAllThreadsGCControlled(currentThread);
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// Do the real work
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VerifyPages(this.objectVisitor);
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StaticData.ScanStaticData(this.referenceVisitor);
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VTable.Deny(PageTable.IsUnusedPage(PageTable.Page(Magic.addressOf(Thread.threadTable))));
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for (int i = 0; i < Thread.threadTable.Length; i++) {
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Thread t = Thread.threadTable[i];
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if (t != null) {
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VTable.Deny(PageTable.IsUnusedPage(PageTable.Page(Magic.addressOf(t))));
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this.stackVerifier.Verify(this.threadReferenceVisitor,
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t);
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}
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}
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}
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private static void VerifyAllThreadsGCControlled(Thread thread) {
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int limit = Thread.threadTable.Length;
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for (int i = 0; i < limit; i++) {
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Thread t = Thread.threadTable[i];
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if (t != null && t != thread) {
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#if !SINGULARITY
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VTable.Assert(Transitions.UnderGCControl(t.threadIndex));
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#endif
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}
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}
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}
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//=========================================
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// Verification of heap and page management
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internal static
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void VerifyPages(ObjectLayout.ObjectVisitor objectVisitor)
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{
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UIntPtr page = UIntPtr.Zero;
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while (page < PageTable.pageTableCount) {
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UIntPtr startPage = page;
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if (!PageTable.IsMyPage(startPage)) {
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page++;
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continue;
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}
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PageType pageType = PageTable.Type(page);
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uint pageProcess = PageTable.Process(page);
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do {
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page++;
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} while (page < PageTable.pageTableCount &&
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PageTable.Type(page) == pageType &&
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PageTable.Process(page) == pageProcess);
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UIntPtr endPage = page;
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switch (pageType) {
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case PageType.Unallocated:
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case PageType.Unknown:
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case PageType.Shared: {
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// The region does not belong to us, so there is
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// nothing to check.
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break;
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}
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case PageType.UnusedClean:
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case PageType.UnusedDirty: {
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PageManager.VerifyUnusedRegion(startPage, endPage);
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break;
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}
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case PageType.System: {
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// We have looked at the region, but it is off-limits
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// for the verifier.
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break;
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}
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case PageType.NonGC: {
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// Since there may be non-objects in the static data
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// pages, we cannot apply the heapVerifier to the
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// region.
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break;
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}
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case PageType.Stack: {
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// The page contains (part of) the activation record
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// stack for one or more threads.
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break;
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}
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default: {
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// We have found a data region
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VTable.Assert(PageTable.IsGcPage(startPage));
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UIntPtr startAddr = PageTable.PageAddr(startPage);
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UIntPtr endAddr = PageTable.PageAddr(endPage);
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GC.installedGC.VisitObjects(objectVisitor,
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startAddr, endAddr);
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break;
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}
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}
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}
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}
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private class GenericReferenceVisitor : NonNullReferenceVisitor
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{
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internal unsafe override void Visit(UIntPtr *loc) {
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UIntPtr addr = *loc;
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UIntPtr page = PageTable.Page(addr);
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PageType pageType = PageTable.Type(page);
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if (!PageTable.IsGcPage(pageType)) {
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VTable.Assert(PageTable.IsNonGcPage(pageType) ||
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PageTable.IsStackPage(pageType) ||
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PageTable.IsSharedPage(pageType));
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return;
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}
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VTable.Assert(PageTable.IsMyPage(page));
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UIntPtr objectAddr = GC.installedGC.FindObjectAddr(addr);
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VTable.Assert(objectAddr == addr);
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UIntPtr vtableAddr =
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Magic.addressOf(Magic.fromAddress(objectAddr).vtable);
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VTable.Assert(PageTable.IsNonGcPage(PageTable.Type(PageTable.Page(vtableAddr))));
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VTable.Assert(Magic.fromAddress(vtableAddr) is VTable);
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}
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}
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internal class GenericThreadReferenceVisitor : NonNullReferenceVisitor
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{
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internal unsafe override void Visit(UIntPtr *loc) {
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UIntPtr addr = *loc;
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UIntPtr page = PageTable.Page(addr);
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PageType pageType = PageTable.Type(page);
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if (!PageTable.IsGcPage(pageType)) {
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VTable.Assert(PageTable.IsNonGcPage(pageType) ||
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PageTable.IsStackPage(pageType) ||
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PageTable.IsSharedPage(pageType));
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return;
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}
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VTable.Assert(PageTable.IsMyPage(page));
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UIntPtr objectAddr = GC.installedGC.FindObjectAddr(addr);
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VTable.Assert(objectAddr <= addr);
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UIntPtr vtableAddr =
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Magic.addressOf(Magic.fromAddress(objectAddr).vtable);
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VTable.Assert(PageTable.IsNonGcPage(PageTable.Type(PageTable.Page(vtableAddr))));
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VTable.Assert(Magic.fromAddress(vtableAddr) is VTable);
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}
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}
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internal class GenericObjectVisitor : ObjectLayout.ObjectVisitor {
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private NonNullReferenceVisitor referenceVisitor;
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#if DEBUG_OFFSETTABLE
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private static UIntPtr lastObjPtr;
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#endif
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internal
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GenericObjectVisitor(NonNullReferenceVisitor referenceVisitor)
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{
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this.referenceVisitor = referenceVisitor;
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#if DEBUG_OFFSETTABLE
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lastObjPtr = UIntPtr.Zero;
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#endif
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}
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internal override UIntPtr Visit(Object obj) {
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#if DEBUG_OFFSETTABLE
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VTable.DebugPrint("visit obj {0:x8}\n", __arglist(Magic.addressOf(obj)));
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if (lastObjPtr != UIntPtr.Zero) {
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UIntPtr lastCard = CardTable.CardNo(lastObjPtr);
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if (lastCard != CardTable.CardNo(Magic.addressOf(obj))) {
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if (!OffsetTable.NoObjectPtrToTheCard(lastCard)) {
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UIntPtr realOffst = lastObjPtr - CardTable.CardAddr(lastCard);
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UIntPtr currOffst = OffsetTable.GetOffset(lastCard);
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if (realOffst != currOffst ) {
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VTable.DebugPrint("Verifier: wrong offset. Card {0:x8} Offset {1:x8} Should be {2:x8}\n",
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__arglist(lastCard, currOffst, realOffst));
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VTable.Assert(false);
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}
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}
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}
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}
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#endif
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return this.referenceVisitor.VisitReferenceFields(obj);
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}
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}
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internal class GenericStackVerifier : StackVerifier {
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internal override
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void Verify(NonNullReferenceVisitor threadReferenceVisitor,
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Thread thread)
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{
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CallStack.ScanStack(thread, threadReferenceVisitor,
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threadReferenceVisitor);
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}
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}
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}
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}
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