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534 lines
18 KiB
Java
534 lines
18 KiB
Java
/*
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* Copyright (c) 2000, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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package sun.jvm.hotspot.runtime;
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import java.io.*;
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import java.util.*;
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import sun.jvm.hotspot.debugger.*;
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import sun.jvm.hotspot.oops.*;
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import sun.jvm.hotspot.types.*;
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import sun.jvm.hotspot.utilities.*;
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import sun.jvm.hotspot.utilities.Observable;
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import sun.jvm.hotspot.utilities.Observer;
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/** This is an abstract class because there are certain OS- and
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CPU-specific operations (like the setting and getting of the last
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Java frame pointer) which need to be factored out. These
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operations are implemented by, for example,
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SolarisSPARCJavaThread, and the concrete subclasses are
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instantiated by the JavaThreadFactory in the Threads class. */
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public class JavaThread extends Thread {
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private static final boolean DEBUG = System.getProperty("sun.jvm.hotspot.runtime.JavaThread.DEBUG") != null;
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private static long threadObjFieldOffset;
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private static AddressField anchorField;
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private static AddressField lastJavaSPField;
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private static AddressField lastJavaPCField;
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private static CIntegerField threadStateField;
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private static AddressField osThreadField;
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private static AddressField stackBaseField;
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private static CIntegerField stackSizeField;
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private static CIntegerField terminatedField;
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private static AddressField activeHandlesField;
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private static JavaThreadPDAccess access;
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// JavaThreadStates read from underlying process
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private static int UNINITIALIZED;
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private static int NEW;
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private static int NEW_TRANS;
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private static int IN_NATIVE;
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private static int IN_NATIVE_TRANS;
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private static int IN_VM;
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private static int IN_VM_TRANS;
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private static int IN_JAVA;
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private static int IN_JAVA_TRANS;
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private static int BLOCKED;
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private static int BLOCKED_TRANS;
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private static int NOT_TERMINATED;
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private static int EXITING;
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private static final String ADDRESS_FORMAT = VM.getVM().isLP64() ? "0x%016x" : "0x%08x";
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static {
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VM.registerVMInitializedObserver(new Observer() {
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public void update(Observable o, Object data) {
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initialize(VM.getVM().getTypeDataBase());
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}
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});
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}
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private static synchronized void initialize(TypeDataBase db) {
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Type type = db.lookupType("JavaThread");
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Type anchorType = db.lookupType("JavaFrameAnchor");
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threadObjFieldOffset = type.getField("_threadObj").getOffset();
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anchorField = type.getAddressField("_anchor");
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lastJavaSPField = anchorType.getAddressField("_last_Java_sp");
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lastJavaPCField = anchorType.getAddressField("_last_Java_pc");
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threadStateField = type.getCIntegerField("_thread_state");
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osThreadField = type.getAddressField("_osthread");
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stackBaseField = type.getAddressField("_stack_base");
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stackSizeField = type.getCIntegerField("_stack_size");
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terminatedField = type.getCIntegerField("_terminated");
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activeHandlesField = type.getAddressField("_active_handles");
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UNINITIALIZED = db.lookupIntConstant("_thread_uninitialized").intValue();
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NEW = db.lookupIntConstant("_thread_new").intValue();
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NEW_TRANS = db.lookupIntConstant("_thread_new_trans").intValue();
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IN_NATIVE = db.lookupIntConstant("_thread_in_native").intValue();
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IN_NATIVE_TRANS = db.lookupIntConstant("_thread_in_native_trans").intValue();
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IN_VM = db.lookupIntConstant("_thread_in_vm").intValue();
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IN_VM_TRANS = db.lookupIntConstant("_thread_in_vm_trans").intValue();
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IN_JAVA = db.lookupIntConstant("_thread_in_Java").intValue();
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IN_JAVA_TRANS = db.lookupIntConstant("_thread_in_Java_trans").intValue();
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BLOCKED = db.lookupIntConstant("_thread_blocked").intValue();
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BLOCKED_TRANS = db.lookupIntConstant("_thread_blocked_trans").intValue();
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NOT_TERMINATED = db.lookupIntConstant("JavaThread::_not_terminated").intValue();
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EXITING = db.lookupIntConstant("JavaThread::_thread_exiting").intValue();
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}
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public JavaThread(Address addr) {
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super(addr);
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}
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void setThreadPDAccess(JavaThreadPDAccess access) {
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this.access = access;
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}
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/** NOTE: for convenience, this differs in definition from the underlying VM.
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Only "pure" JavaThreads return true; CompilerThreads, the CodeCacheSweeperThread,
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JVMDIDebuggerThreads return false.
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FIXME:
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consider encapsulating platform-specific functionality in an
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object instead of using inheritance (which is the primary reason
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we can't traverse CompilerThreads, etc; didn't want to have, for
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example, "SolarisSPARCCompilerThread".) */
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public boolean isJavaThread() { return true; }
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public boolean isExiting () {
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return (getTerminated() == EXITING) || isTerminated();
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}
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public boolean isTerminated() {
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return (getTerminated() != NOT_TERMINATED) && (getTerminated() != EXITING);
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}
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public static AddressField getAnchorField() { return anchorField; }
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/** Get the last Java stack pointer */
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public Address getLastJavaSP() {
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Address sp = lastJavaSPField.getValue(addr.addOffsetTo(anchorField.getOffset()));
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return sp;
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}
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public Address getLastJavaPC() {
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Address pc = lastJavaPCField.getValue(addr.addOffsetTo(anchorField.getOffset()));
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return pc;
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}
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/** Abstract accessor to last Java frame pointer, implemented by
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OS/CPU-specific JavaThread implementation. May return null if
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there is no frame pointer or if it is not necessary on this
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platform. */
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public Address getLastJavaFP(){
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return access.getLastJavaFP(addr);
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}
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/** Abstract accessor to last Java pc, implemented by
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OS/CPU-specific JavaThread implementation. May return null if
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there is no frame pointer or if it is not necessary on this
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platform. */
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/*
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public Address getLastJavaPC(){
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return access.getLastJavaPC(addr);
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}
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*/
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// FIXME: not yet implementable
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// public abstract void setLastJavaFP(Address fp);
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/** A stack pointer older than any java frame stack pointer. Only
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needed on some platforms; for example, see
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thread_solaris_sparc.hpp. */
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public Address getBaseOfStackPointer(){
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return access.getBaseOfStackPointer(addr);
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}
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// FIXME: not yet implementable
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// public abstract void setBaseOfStackPointer(Address fp);
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/** Tells whether the last Java frame is set */
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public boolean hasLastJavaFrame() {
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return (getLastJavaSP() != null);
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}
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/** Accessing frames */
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public Frame getLastFrame() {
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// FIXME: would need to implement runtime routine
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// "cacheStatePD(boolean)" for reflective system to be able to
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// flush register windows on SPARC
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return cookLastFrame(getLastFramePD());
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}
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/** Internal routine implemented by platform-dependent subclasses */
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protected Frame getLastFramePD(){
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return access.getLastFramePD(this, addr);
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}
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/** Accessing frames. Returns the last Java VFrame or null if none
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was present. (NOTE that this is mostly unusable in a debugging
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system; see getLastJavaVFrameDbg, below, which provides very
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different functionality.) */
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public JavaVFrame getLastJavaVFrame(RegisterMap regMap) {
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(regMap != null, "a map must be given");
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}
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Frame f = getLastFrame();
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if (f == null) {
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return null;
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}
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for (VFrame vf = VFrame.newVFrame(f, regMap, this); vf != null; vf = vf.sender()) {
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if (vf.isJavaFrame()) {
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return (JavaVFrame) vf;
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}
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}
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return null;
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}
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/** This should only be used by a debugger. Uses the current frame
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guess to attempt to get the topmost JavaVFrame.
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(getLastJavaVFrame, as a port of the VM's routine, assumes the
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VM is at a safepoint.) */
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public JavaVFrame getLastJavaVFrameDbg() {
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RegisterMap regMap = newRegisterMap(true);
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sun.jvm.hotspot.runtime.Frame f = getCurrentFrameGuess();
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if (f == null) return null;
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boolean imprecise = true;
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if (f.isInterpretedFrame() && !f.isInterpretedFrameValid()) {
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if (DEBUG) {
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System.out.println("Correcting for invalid interpreter frame");
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}
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f = f.sender(regMap);
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imprecise = false;
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}
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VFrame vf = VFrame.newVFrame(f, regMap, this, true, imprecise);
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if (vf == null) {
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if (DEBUG) {
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System.out.println(" (Unable to create vframe for topmost frame guess)");
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}
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return null;
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}
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return vf.isJavaFrame() ? (JavaVFrame)vf : vf.javaSender();
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}
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/** In this system, a JavaThread is the top-level factory for a
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RegisterMap, since the JavaThread implementation is already
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platform-specific and RegisterMap is also necessarily
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platform-specific. The updateMap argument indicates whether the
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register map needs to be updated, for example during stack
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traversal -- see frame.hpp. */
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public RegisterMap newRegisterMap(boolean updateMap){
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return access.newRegisterMap(this, updateMap);
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}
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/** This is only designed to be used by the debugging system.
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Returns a "best guess" of the topmost frame on the stack. This
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guess should be as "raw" as possible. For example, if the
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topmost frame is an interpreter frame (the return PC is in the
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interpreter) but is not a valid frame (i.e., the BCI has not yet
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been set up) this should still return the topmost frame and not
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the sender. Validity checks are done at higher levels. */
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public Frame getCurrentFrameGuess(){
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return access.getCurrentFrameGuess(this, addr);
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}
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/** Also only intended for use by the debugging system. Provides the
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same effect of OSThread::print(); that is, prints a value which
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allows the user to intuitively understand which native OS thread
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maps to this Java thread. Does not print a newline or leading or
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trailing spaces. */
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public void printThreadIDOn(PrintStream tty) {
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access.printThreadIDOn(addr,tty);
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}
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public void printThreadID() {
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printThreadIDOn(System.out);
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}
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public ThreadProxy getThreadProxy() {
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return access.getThreadProxy(addr);
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}
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//
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// Safepoint support
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//
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public JavaThreadState getThreadState() {
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int val = (int) threadStateField.getValue(addr);
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if (val == UNINITIALIZED) {
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return JavaThreadState.UNINITIALIZED;
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} else if (val == NEW) {
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return JavaThreadState.NEW;
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} else if (val == NEW_TRANS) {
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return JavaThreadState.NEW_TRANS;
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} else if (val == IN_NATIVE) {
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return JavaThreadState.IN_NATIVE;
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} else if (val == IN_NATIVE_TRANS) {
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return JavaThreadState.IN_NATIVE_TRANS;
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} else if (val == IN_VM) {
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return JavaThreadState.IN_VM;
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} else if (val == IN_VM_TRANS) {
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return JavaThreadState.IN_VM_TRANS;
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} else if (val == IN_JAVA) {
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return JavaThreadState.IN_JAVA;
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} else if (val == IN_JAVA_TRANS) {
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return JavaThreadState.IN_JAVA_TRANS;
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} else if (val == BLOCKED) {
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return JavaThreadState.BLOCKED;
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} else if (val == BLOCKED_TRANS) {
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return JavaThreadState.BLOCKED_TRANS;
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} else {
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throw new RuntimeException("Illegal thread state " + val);
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}
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}
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// FIXME: not yet implementable
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// public void setThreadState(JavaThreadState s);
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//
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// Miscellaneous operations
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//
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public OSThread getOSThread() {
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return (OSThread) VMObjectFactory.newObject(OSThread.class, osThreadField.getValue(addr));
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}
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public Address getStackBase() {
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return stackBaseField.getValue(addr);
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}
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public long getStackBaseValue() {
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return VM.getVM().getAddressValue(getStackBase());
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}
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public long getStackSize() {
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return stackSizeField.getValue(addr);
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}
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public int getTerminated() {
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return (int) terminatedField.getValue(addr);
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}
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/** Gets the Java-side thread object for this JavaThread */
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public Oop getThreadObj() {
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Oop obj = null;
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try {
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Address addr = getAddress().addOffsetTo(threadObjFieldOffset);
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VMOopHandle vmOopHandle = VMObjectFactory.newObject(VMOopHandle.class, addr);
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obj = vmOopHandle.resolve();
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} catch (Exception e) {
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e.printStackTrace();
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}
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return obj;
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}
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/** Get the Java-side name of this thread */
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public String getThreadName() {
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Oop threadObj = getThreadObj();
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if (threadObj == null) {
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return "<null>";
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}
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return OopUtilities.threadOopGetName(threadObj);
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}
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//
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// Oop traversal
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//
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public void oopsDo(AddressVisitor oopVisitor) {
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super.oopsDo(oopVisitor);
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// FIXME: add in the rest of the routine from the VM
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// Traverse the execution stack
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for(StackFrameStream fst = new StackFrameStream(this); !fst.isDone(); fst.next()) {
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fst.getCurrent().oopsDo(oopVisitor, fst.getRegisterMap());
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}
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}
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public boolean isInStack(Address a) {
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(VM.getVM().isDebugging(), "Not yet implemented for non-debugging system");
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}
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Address sp = lastSPDbg();
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Address stackBase = getStackBase();
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// Be robust
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if (sp == null) return false;
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return stackBase.greaterThan(a) && sp.lessThanOrEqual(a);
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}
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public boolean isLockOwned(Address a) {
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Address stackBase = getStackBase();
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Address stackLimit = stackBase.addOffsetTo(-getStackSize());
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return stackBase.greaterThan(a) && stackLimit.lessThanOrEqual(a);
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// FIXME: should traverse MonitorArray/MonitorChunks as in VM
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}
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public Oop getCurrentParkBlocker() {
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Oop threadObj = getThreadObj();
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if (threadObj != null) {
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return OopUtilities.threadOopGetParkBlocker(threadObj);
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}
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return null;
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}
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public JNIHandleBlock activeHandles() {
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Address a = activeHandlesField.getAddress(addr);
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if (a == null) {
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return null;
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}
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return new JNIHandleBlock(a);
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}
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public void printInfoOn(PrintStream tty) {
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tty.println("State: " + getThreadState().toString());
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// Attempt to figure out the addresses covered by Java frames.
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// NOTE: we should make this a method and let the Stackwalk panel use the result too.
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//
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sun.jvm.hotspot.runtime.Frame tmpFrame = getCurrentFrameGuess();
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if (tmpFrame != null ) {
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Address sp = tmpFrame.getSP();
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Address maxSP = sp;
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Address minSP = sp;
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RegisterMap tmpMap = newRegisterMap(false);
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while ((tmpFrame != null) && (!tmpFrame.isFirstFrame())) {
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tmpFrame = tmpFrame.sender(tmpMap);
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if (tmpFrame != null) {
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sp = tmpFrame.getSP();
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maxSP = AddressOps.max(maxSP, sp);
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minSP = AddressOps.min(minSP, sp);
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}
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}
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tty.println("Stack in use by Java: " + minSP + " .. " + maxSP);
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} else {
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tty.println("No Java frames present");
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}
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tty.println("Base of Stack: " + getStackBase());
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tty.println("Last_Java_SP: " + getLastJavaSP());
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tty.println("Last_Java_FP: " + getLastJavaFP());
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tty.println("Last_Java_PC: " + getLastJavaPC());
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// More stuff like saved_execption_pc, safepoint_state, ...
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access.printInfoOn(addr, tty);
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}
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///////////////////////////////
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// //
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// FIXME: add more accessors //
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// //
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///////////////////////////////
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//--------------------------------------------------------------------------------
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// Internals only below this point
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//
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private Frame cookLastFrame(Frame fr) {
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if (fr == null) {
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return null;
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}
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Address pc = fr.getPC();
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if (Assert.ASSERTS_ENABLED) {
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if (pc == null) {
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Assert.that(VM.getVM().isDebugging(), "must have PC");
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}
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}
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return fr;
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}
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public Address lastSPDbg() {
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return access.getLastSP(addr);
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}
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// Print the contents of all registers in the thread's context
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public void printThreadContextOn(PrintStream out, boolean verbose){
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ThreadContext tc = getThreadProxy().getContext();
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for (int r = 0; r < tc.getNumRegisters(); r++) {
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Address regAddr = tc.getRegisterAsAddress(r);
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System.out.format("%s: %s", tc.getRegisterName(r), regAddr);
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if (regAddr == null) {
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System.out.println();
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} else {
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PointerLocation l = PointerFinder.find(regAddr);
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if (l.isUnknown()) {
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System.out.println();
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} else {
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System.out.print(": ");
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l.printOn(System.out, false, verbose);
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}
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}
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}
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}
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public void printThreadInfoOn(PrintStream out){
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Oop threadOop = this.getThreadObj();
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out.print("\"");
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out.print(this.getThreadName());
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out.print("\" #");
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out.print(OopUtilities.threadOopGetTID(threadOop));
|
|
if(OopUtilities.threadOopGetDaemon(threadOop)){
|
|
out.print(" daemon");
|
|
}
|
|
out.print(" prio=");
|
|
out.print(OopUtilities.threadOopGetPriority(threadOop));
|
|
out.print(" tid=");
|
|
out.print(this.getAddress());
|
|
out.print(" nid=");
|
|
out.print(String.format("%d ",this.getOSThread().threadId()));
|
|
out.print(getOSThread().getThreadState().getPrintVal());
|
|
out.print(" [");
|
|
if(this.getLastJavaSP() == null){
|
|
out.print(String.format(ADDRESS_FORMAT,0L));
|
|
} else {
|
|
out.print(this.getLastJavaSP().andWithMask(~0xFFF));
|
|
}
|
|
out.println("]");
|
|
out.print(" java.lang.Thread.State: ");
|
|
out.println(OopUtilities.threadOopGetThreadStatusName(threadOop));
|
|
out.print(" JavaThread state: _thread_");
|
|
out.println(this.getThreadState().toString().toLowerCase());
|
|
}
|
|
}
|