Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/utilities/PointerFinder.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 1a5913bf5e19 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/utilities/PointerFinder.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,149 @@ +/* + * Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +package sun.jvm.hotspot.utilities; + +import sun.jvm.hotspot.code.*; +import sun.jvm.hotspot.debugger.*; +import sun.jvm.hotspot.gc_interface.*; +import sun.jvm.hotspot.interpreter.*; +import sun.jvm.hotspot.runtime.*; +import sun.jvm.hotspot.memory.*; + +/** This class, only intended for use in the debugging system, + provides the functionality of find() in the VM. */ + +public class PointerFinder { + public static PointerLocation find(Address a) { + PointerLocation loc = new PointerLocation(a); + + CollectedHeap heap = VM.getVM().getUniverse().heap(); + if (heap instanceof GenCollectedHeap) { + GenCollectedHeap genheap = (GenCollectedHeap) heap; + if (genheap.isIn(a)) { + for (int i = 0; i < genheap.nGens(); i++) { + Generation g = genheap.getGen(i); + if (g.isIn(a)) { + loc.gen = g; + break; + } + } + + if (loc.gen == null) { + // Should be in perm gen + Generation permGen = genheap.permGen(); + if (Assert.ASSERTS_ENABLED) { + Assert.that(permGen.isIn(a), "should have been in ordinary or perm gens if it's in the heap"); + } + loc.permGen = permGen; + } + + if (VM.getVM().getUseTLAB()) { + // Try to find thread containing it + for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) { + ThreadLocalAllocBuffer tlab = t.tlab(); + if (tlab.contains(a)) { + loc.inTLAB = true; + loc.tlabThread = t; + loc.tlab = tlab; + break; + } + } + } + + return loc; + } + } else { + if (heap.isIn(a)) { + loc.heap = heap; + return loc; + } + } + + Interpreter interp = VM.getVM().getInterpreter(); + if (interp.contains(a)) { + loc.inInterpreter = true; + loc.interpreterCodelet = interp.getCodeletContaining(a); + return loc; + } + + if (!VM.getVM().isCore()) { + CodeCache c = VM.getVM().getCodeCache(); + if (c.contains(a)) { + loc.inCodeCache = true; + loc.blob = c.findBlobUnsafe(a); + if (Assert.ASSERTS_ENABLED) { + Assert.that(loc.blob != null, "Should have found CodeBlob"); + } + loc.inBlobInstructions = loc.blob.instructionsContains(a); + loc.inBlobData = loc.blob.dataContains(a); + loc.inBlobOops = loc.blob.oopsContains(a); + loc.inBlobUnknownLocation = (!(loc.inBlobInstructions || + loc.inBlobData || + loc.inBlobOops)); + return loc; + } + } + + // Check JNIHandles; both local and global + JNIHandles handles = VM.getVM().getJNIHandles(); + JNIHandleBlock handleBlock = handles.globalHandles(); + if (handleBlock != null) { + handleBlock = handleBlock.blockContainingHandle(a); + } + if (handleBlock != null) { + loc.inStrongGlobalJNIHandleBlock = true; + loc.handleBlock = handleBlock; + return loc; + } else { + handleBlock = handles.weakGlobalHandles(); + if (handleBlock != null) { + handleBlock = handleBlock.blockContainingHandle(a); + if (handleBlock != null) { + loc.inWeakGlobalJNIHandleBlock = true; + loc.handleBlock = handleBlock; + return loc; + } else { + // Look in thread-local handles + for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) { + handleBlock = t.activeHandles(); + if (handleBlock != null) { + handleBlock = handleBlock.blockContainingHandle(a); + if (handleBlock != null) { + loc.inLocalJNIHandleBlock = true; + loc.handleBlock = handleBlock; + loc.handleThread = t; + return loc; + } + } + } + } + } + } + + + // Fall through; have to return it anyway. + return loc; + } +}