Expand Up @@ -125,7 +125,7 @@ private static int allocateFromStack(Continuation cont, Pointer baseSp, Pointer if (!yield) { PreemptVisitor visitor = new PreemptVisitor(baseSp); JavaStackWalker.walkThread(targetThread, visitor); if (visitor.preemptStatus != Continuation.YIELD_SUCCESS) { if (visitor.preemptStatus != Continuation.FREEZE_OK) { return visitor.preemptStatus; } startSp = visitor.leafSP; Expand All @@ -138,7 +138,7 @@ private static int allocateFromStack(Continuation cont, Pointer baseSp, Pointer StoredContinuation instance = allocate(framesSize); fillUninterruptibly(instance, startIp, startSp, framesSize); cont.stored = instance; return Continuation.YIELD_SUCCESS; return Continuation.FREEZE_OK; }
@Uninterruptible(reason = "Prevent modifications to the stack while initializing instance and copying frames.") Expand Down Expand Up @@ -187,39 +187,18 @@ public static boolean walkReferences(Pointer baseAddress, ObjectReferenceVisitor StoredContinuation s = (StoredContinuation) holderObject; assert baseAddress.equal(Word.objectToUntrackedPointer(holderObject));
CodePointer startIp = getIP(s); if (startIp.isNull()) { JavaStackWalk walk = StackValue.get(JavaStackWalk.class); if (!initWalk(s, walk)) { return true; // uninitialized, ignore }
Pointer startSp = getFramesStart(s); Pointer endSp = arrayAddress(s).add(getSizeInBytes(s));
JavaStackWalk walk = StackValue.get(JavaStackWalk.class); JavaStackWalker.initWalk(walk, startSp, endSp, startIp);
SimpleCodeInfoQueryResult queryResult = StackValue.get(SimpleCodeInfoQueryResult.class); do { Pointer sp = walk.getSP(); CodePointer ip = walk.getPossiblyStaleIP();
UntetheredCodeInfo untetheredCodeInfo = walk.getIPCodeInfo(); Object tether = CodeInfoAccess.acquireTether(untetheredCodeInfo); try { CodeInfo codeInfo = CodeInfoAccess.convert(untetheredCodeInfo); VMError.guarantee(codeInfo.equal(CodeInfoTable.getImageCodeInfo())); VMError.guarantee(Deoptimizer.checkDeoptimized(sp) == null); if (codeInfo.isNull()) { throw JavaStackWalker.reportUnknownFrameEncountered(sp, ip, null); }
CodeInfoAccess.lookupCodeInfo(codeInfo, CodeInfoAccess.relativeIP(codeInfo, ip), queryResult);
NonmovableArray<Byte> referenceMapEncoding = CodeInfoAccess.getStackReferenceMapEncoding(codeInfo); long referenceMapIndex = queryResult.getReferenceMapIndex(); if (referenceMapIndex != ReferenceMapIndex.NO_REFERENCE_MAP) { CodeReferenceMapDecoder.walkOffsetsFromPointer(sp, referenceMapEncoding, referenceMapIndex, visitor, holderObject); } CodeInfo codeInfo = CodeInfoAccess.convert(untetheredCodeInfo, tether); walkFrameReferences(walk, codeInfo, queryResult, visitor, holderObject); } finally { CodeInfoAccess.releaseTether(untetheredCodeInfo, tether); } Expand All @@ -228,13 +207,52 @@ public static boolean walkReferences(Pointer baseAddress, ObjectReferenceVisitor return true; }
@Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true) public static boolean initWalk(StoredContinuation s, JavaStackWalk walk) { CodePointer startIp = getIP(s); if (startIp.isNull()) { return false; // uninitialized }
initWalk(s, walk, startIp); return true; }
@Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true) public static void initWalk(StoredContinuation s, JavaStackWalk walk, CodePointer startIp) { Pointer startSp = getFramesStart(s); Pointer endSp = arrayAddress(s).add(getSizeInBytes(s));
JavaStackWalker.initWalk(walk, startSp, endSp, startIp); walk.setAnchor(WordFactory.nullPointer()); // never use an anchor of this platform thread }
@Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true) public static void walkFrameReferences(JavaStackWalk walk, CodeInfo codeInfo, SimpleCodeInfoQueryResult queryResult, ObjectReferenceVisitor visitor, Object holderObject) { Pointer sp = walk.getSP(); CodePointer ip = walk.getPossiblyStaleIP(); if (codeInfo.isNull()) { throw JavaStackWalker.reportUnknownFrameEncountered(sp, ip, null); } VMError.guarantee(codeInfo.equal(CodeInfoTable.getImageCodeInfo())); VMError.guarantee(Deoptimizer.checkDeoptimized(sp) == null);
CodeInfoAccess.lookupCodeInfo(codeInfo, CodeInfoAccess.relativeIP(codeInfo, ip), queryResult);
NonmovableArray<Byte> referenceMapEncoding = CodeInfoAccess.getStackReferenceMapEncoding(codeInfo); long referenceMapIndex = queryResult.getReferenceMapIndex(); if (referenceMapIndex != ReferenceMapIndex.NO_REFERENCE_MAP) { CodeReferenceMapDecoder.walkOffsetsFromPointer(sp, referenceMapEncoding, referenceMapIndex, visitor, holderObject); } }
private static final class PreemptVisitor extends StackFrameVisitor { private final Pointer endSP; private boolean startFromNextFrame = false;
Pointer leafSP; CodePointer leafIP; int preemptStatus = Continuation.YIELD_SUCCESS; int preemptStatus = Continuation.FREEZE_OK;
PreemptVisitor(Pointer endSP) { this.endSP = endSP; Expand Down