src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/linux_x86/LinuxX86JavaThreadPDAccess.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/linux_x86/LinuxX86JavaThreadPDAccess.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2002, 2003, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+package sun.jvm.hotspot.runtime.linux_x86;
+
+import java.io.*;
+import java.util.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.debugger.x86.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.runtime.x86.*;
+import sun.jvm.hotspot.types.*;
+import sun.jvm.hotspot.utilities.*;
+
+public class LinuxX86JavaThreadPDAccess implements JavaThreadPDAccess {
+ private static AddressField lastJavaFPField;
+ private static AddressField osThreadField;
+
+ // Field from OSThread
+ private static CIntegerField osThreadThreadIDField;
+
+ // This is currently unneeded but is being kept in case we change
+ // the currentFrameGuess algorithm
+ private static final long GUESS_SCAN_RANGE = 128 * 1024;
+
+ static {
+ VM.registerVMInitializedObserver(new Observer() {
+ public void update(Observable o, Object data) {
+ initialize(VM.getVM().getTypeDataBase());
+ }
+ });
+ }
+
+ private static synchronized void initialize(TypeDataBase db) {
+ Type type = db.lookupType("JavaThread");
+ osThreadField = type.getAddressField("_osthread");
+
+ Type anchorType = db.lookupType("JavaFrameAnchor");
+ lastJavaFPField = anchorType.getAddressField("_last_Java_fp");
+
+ Type osThreadType = db.lookupType("OSThread");
+ osThreadThreadIDField = osThreadType.getCIntegerField("_thread_id");
+ }
+
+ public Address getLastJavaFP(Address addr) {
+ return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset()));
+ }
+
+ public Address getLastJavaPC(Address addr) {
+ return null;
+ }
+
+ public Address getBaseOfStackPointer(Address addr) {
+ return null;
+ }
+
+ public Frame getLastFramePD(JavaThread thread, Address addr) {
+ Address fp = thread.getLastJavaFP();
+ if (fp == null) {
+ return null; // no information
+ }
+ return new X86Frame(thread.getLastJavaSP(), fp);
+ }
+
+ public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {
+ return new X86RegisterMap(thread, updateMap);
+ }
+
+ public Frame getCurrentFrameGuess(JavaThread thread, Address addr) {
+ ThreadProxy t = getThreadProxy(addr);
+ X86ThreadContext context = (X86ThreadContext) t.getContext();
+ X86CurrentFrameGuess guesser = new X86CurrentFrameGuess(context, thread);
+ if (!guesser.run(GUESS_SCAN_RANGE)) {
+ return null;
+ }
+ if (guesser.getPC() == null) {
+ return new X86Frame(guesser.getSP(), guesser.getFP());
+ } else {
+ return new X86Frame(guesser.getSP(), guesser.getFP(), guesser.getPC());
+ }
+ }
+
+ public void printThreadIDOn(Address addr, PrintStream tty) {
+ tty.print(getThreadProxy(addr));
+ }
+
+ public void printInfoOn(Address threadAddr, PrintStream tty) {
+ tty.print("Thread id: ");
+ printThreadIDOn(threadAddr, tty);
+// tty.println("\nPostJavaState: " + getPostJavaState(threadAddr));
+ }
+
+ public Address getLastSP(Address addr) {
+ ThreadProxy t = getThreadProxy(addr);
+ X86ThreadContext context = (X86ThreadContext) t.getContext();
+ return context.getRegisterAsAddress(X86ThreadContext.ESP);
+ }
+
+ public ThreadProxy getThreadProxy(Address addr) {
+ // Addr is the address of the JavaThread.
+ // Fetch the OSThread (for now and for simplicity, not making a
+ // separate "OSThread" class in this package)
+ Address osThreadAddr = osThreadField.getValue(addr);
+ // Get the address of the _thread_id from the OSThread
+ Address threadIdAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset());
+
+ JVMDebugger debugger = VM.getVM().getDebugger();
+ return debugger.getThreadForIdentifierAddress(threadIdAddr);
+ }
+}