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/*
* 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;
}
}
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