| /* |
| * Copyright (c) 2000, 2013, 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; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.oops.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| /** This is an abstract class because there are certain OS- and |
| CPU-specific operations (like the setting and getting of the last |
| Java frame pointer) which need to be factored out. These |
| operations are implemented by, for example, |
| SolarisSPARCJavaThread, and the concrete subclasses are |
| instantiated by the JavaThreadFactory in the Threads class. */ |
| |
| public class JavaThread extends Thread { |
| private static final boolean DEBUG = System.getProperty("sun.jvm.hotspot.runtime.JavaThread.DEBUG") != null; |
| |
| private static AddressField nextField; |
| private static sun.jvm.hotspot.types.OopField threadObjField; |
| private static AddressField anchorField; |
| private static AddressField lastJavaSPField; |
| private static AddressField lastJavaPCField; |
| private static CIntegerField threadStateField; |
| private static AddressField osThreadField; |
| private static AddressField stackBaseField; |
| private static CIntegerField stackSizeField; |
| |
| private static JavaThreadPDAccess access; |
| |
| // JavaThreadStates read from underlying process |
| private static int UNINITIALIZED; |
| private static int NEW; |
| private static int NEW_TRANS; |
| private static int IN_NATIVE; |
| private static int IN_NATIVE_TRANS; |
| private static int IN_VM; |
| private static int IN_VM_TRANS; |
| private static int IN_JAVA; |
| private static int IN_JAVA_TRANS; |
| private static int BLOCKED; |
| private static int BLOCKED_TRANS; |
| |
| 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"); |
| Type anchorType = db.lookupType("JavaFrameAnchor"); |
| |
| nextField = type.getAddressField("_next"); |
| threadObjField = type.getOopField("_threadObj"); |
| anchorField = type.getAddressField("_anchor"); |
| lastJavaSPField = anchorType.getAddressField("_last_Java_sp"); |
| lastJavaPCField = anchorType.getAddressField("_last_Java_pc"); |
| threadStateField = type.getCIntegerField("_thread_state"); |
| osThreadField = type.getAddressField("_osthread"); |
| stackBaseField = type.getAddressField("_stack_base"); |
| stackSizeField = type.getCIntegerField("_stack_size"); |
| |
| UNINITIALIZED = db.lookupIntConstant("_thread_uninitialized").intValue(); |
| NEW = db.lookupIntConstant("_thread_new").intValue(); |
| NEW_TRANS = db.lookupIntConstant("_thread_new_trans").intValue(); |
| IN_NATIVE = db.lookupIntConstant("_thread_in_native").intValue(); |
| IN_NATIVE_TRANS = db.lookupIntConstant("_thread_in_native_trans").intValue(); |
| IN_VM = db.lookupIntConstant("_thread_in_vm").intValue(); |
| IN_VM_TRANS = db.lookupIntConstant("_thread_in_vm_trans").intValue(); |
| IN_JAVA = db.lookupIntConstant("_thread_in_Java").intValue(); |
| IN_JAVA_TRANS = db.lookupIntConstant("_thread_in_Java_trans").intValue(); |
| BLOCKED = db.lookupIntConstant("_thread_blocked").intValue(); |
| BLOCKED_TRANS = db.lookupIntConstant("_thread_blocked_trans").intValue(); |
| } |
| |
| public JavaThread(Address addr) { |
| super(addr); |
| } |
| |
| void setThreadPDAccess(JavaThreadPDAccess access) { |
| this.access = access; |
| } |
| |
| public JavaThread next() { |
| Address threadAddr = nextField.getValue(addr); |
| if (threadAddr == null) { |
| return null; |
| } |
| |
| return VM.getVM().getThreads().createJavaThreadWrapper(threadAddr); |
| } |
| |
| /** NOTE: for convenience, this differs in definition from the |
| underlying VM. Only "pure" JavaThreads return true; |
| CompilerThreads and JVMDIDebuggerThreads return false. FIXME: |
| consider encapsulating platform-specific functionality in an |
| object instead of using inheritance (which is the primary reason |
| we can't traverse CompilerThreads, etc; didn't want to have, for |
| example, "SolarisSPARCCompilerThread".) */ |
| public boolean isJavaThread() { return true; } |
| |
| public static AddressField getAnchorField() { return anchorField; } |
| |
| /** Get the last Java stack pointer */ |
| public Address getLastJavaSP() { |
| Address sp = lastJavaSPField.getValue(addr.addOffsetTo(anchorField.getOffset())); |
| return sp; |
| } |
| |
| public Address getLastJavaPC() { |
| Address pc = lastJavaPCField.getValue(addr.addOffsetTo(anchorField.getOffset())); |
| return pc; |
| } |
| |
| /** Abstract accessor to last Java frame pointer, implemented by |
| OS/CPU-specific JavaThread implementation. May return null if |
| there is no frame pointer or if it is not necessary on this |
| platform. */ |
| public Address getLastJavaFP(){ |
| return access.getLastJavaFP(addr); |
| } |
| |
| /** Abstract accessor to last Java pc, implemented by |
| OS/CPU-specific JavaThread implementation. May return null if |
| there is no frame pointer or if it is not necessary on this |
| platform. */ |
| |
| /* |
| public Address getLastJavaPC(){ |
| return access.getLastJavaPC(addr); |
| } |
| */ |
| |
| // FIXME: not yet implementable |
| // public abstract void setLastJavaFP(Address fp); |
| |
| /** A stack pointer older than any java frame stack pointer. Only |
| needed on some platforms; for example, see |
| thread_solaris_sparc.hpp. */ |
| public Address getBaseOfStackPointer(){ |
| return access.getBaseOfStackPointer(addr); |
| } |
| // FIXME: not yet implementable |
| // public abstract void setBaseOfStackPointer(Address fp); |
| |
| /** Tells whether the last Java frame is set */ |
| public boolean hasLastJavaFrame() { |
| return (getLastJavaSP() != null); |
| } |
| |
| /** Accessing frames */ |
| public Frame getLastFrame() { |
| // FIXME: would need to implement runtime routine |
| // "cacheStatePD(boolean)" for reflective system to be able to |
| // flush register windows on SPARC |
| return cookLastFrame(getLastFramePD()); |
| } |
| |
| /** Internal routine implemented by platform-dependent subclasses */ |
| protected Frame getLastFramePD(){ |
| return access.getLastFramePD(this, addr); |
| } |
| |
| /** Accessing frames. Returns the last Java VFrame or null if none |
| was present. (NOTE that this is mostly unusable in a debugging |
| system; see getLastJavaVFrameDbg, below, which provides very |
| different functionality.) */ |
| public JavaVFrame getLastJavaVFrame(RegisterMap regMap) { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(regMap != null, "a map must be given"); |
| } |
| Frame f = getLastFrame(); |
| if (f == null) { |
| return null; |
| } |
| for (VFrame vf = VFrame.newVFrame(f, regMap, this); vf != null; vf = vf.sender()) { |
| if (vf.isJavaFrame()) { |
| return (JavaVFrame) vf; |
| } |
| } |
| return null; |
| } |
| |
| /** This should only be used by a debugger. Uses the current frame |
| guess to attempt to get the topmost JavaVFrame. |
| (getLastJavaVFrame, as a port of the VM's routine, assumes the |
| VM is at a safepoint.) */ |
| public JavaVFrame getLastJavaVFrameDbg() { |
| RegisterMap regMap = newRegisterMap(true); |
| sun.jvm.hotspot.runtime.Frame f = getCurrentFrameGuess(); |
| if (f == null) return null; |
| boolean imprecise = true; |
| if (f.isInterpretedFrame() && !f.isInterpretedFrameValid()) { |
| if (DEBUG) { |
| System.out.println("Correcting for invalid interpreter frame"); |
| } |
| f = f.sender(regMap); |
| imprecise = false; |
| } |
| VFrame vf = VFrame.newVFrame(f, regMap, this, true, imprecise); |
| if (vf == null) { |
| if (DEBUG) { |
| System.out.println(" (Unable to create vframe for topmost frame guess)"); |
| } |
| return null; |
| } |
| return vf.isJavaFrame() ? (JavaVFrame)vf : vf.javaSender(); |
| } |
| |
| /** In this system, a JavaThread is the top-level factory for a |
| RegisterMap, since the JavaThread implementation is already |
| platform-specific and RegisterMap is also necessarily |
| platform-specific. The updateMap argument indicates whether the |
| register map needs to be updated, for example during stack |
| traversal -- see frame.hpp. */ |
| public RegisterMap newRegisterMap(boolean updateMap){ |
| return access.newRegisterMap(this, updateMap); |
| } |
| |
| /** This is only designed to be used by the debugging system. |
| Returns a "best guess" of the topmost frame on the stack. This |
| guess should be as "raw" as possible. For example, if the |
| topmost frame is an interpreter frame (the return PC is in the |
| interpreter) but is not a valid frame (i.e., the BCI has not yet |
| been set up) this should still return the topmost frame and not |
| the sender. Validity checks are done at higher levels. */ |
| public Frame getCurrentFrameGuess(){ |
| return access.getCurrentFrameGuess(this, addr); |
| } |
| |
| /** Also only intended for use by the debugging system. Provides the |
| same effect of OSThread::print(); that is, prints a value which |
| allows the user to intuitively understand which native OS thread |
| maps to this Java thread. Does not print a newline or leading or |
| trailing spaces. */ |
| public void printThreadIDOn(PrintStream tty) { |
| access.printThreadIDOn(addr,tty); |
| } |
| |
| public void printThreadID() { |
| printThreadIDOn(System.out); |
| } |
| |
| public ThreadProxy getThreadProxy() { |
| return access.getThreadProxy(addr); |
| } |
| |
| // |
| // Safepoint support |
| // |
| |
| public JavaThreadState getThreadState() { |
| int val = (int) threadStateField.getValue(addr); |
| if (val == UNINITIALIZED) { |
| return JavaThreadState.UNINITIALIZED; |
| } else if (val == NEW) { |
| return JavaThreadState.NEW; |
| } else if (val == NEW_TRANS) { |
| return JavaThreadState.NEW_TRANS; |
| } else if (val == IN_NATIVE) { |
| return JavaThreadState.IN_NATIVE; |
| } else if (val == IN_NATIVE_TRANS) { |
| return JavaThreadState.IN_NATIVE_TRANS; |
| } else if (val == IN_VM) { |
| return JavaThreadState.IN_VM; |
| } else if (val == IN_VM_TRANS) { |
| return JavaThreadState.IN_VM_TRANS; |
| } else if (val == IN_JAVA) { |
| return JavaThreadState.IN_JAVA; |
| } else if (val == IN_JAVA_TRANS) { |
| return JavaThreadState.IN_JAVA_TRANS; |
| } else if (val == BLOCKED) { |
| return JavaThreadState.BLOCKED; |
| } else if (val == BLOCKED_TRANS) { |
| return JavaThreadState.BLOCKED_TRANS; |
| } else { |
| throw new RuntimeException("Illegal thread state " + val); |
| } |
| } |
| // FIXME: not yet implementable |
| // public void setThreadState(JavaThreadState s); |
| |
| // |
| // Miscellaneous operations |
| // |
| |
| public OSThread getOSThread() { |
| return (OSThread) VMObjectFactory.newObject(OSThread.class, osThreadField.getValue(addr)); |
| } |
| |
| public Address getStackBase() { |
| return stackBaseField.getValue(addr); |
| } |
| |
| public long getStackBaseValue() { |
| return VM.getVM().getAddressValue(getStackBase()); |
| } |
| |
| public long getStackSize() { |
| return stackSizeField.getValue(addr); |
| } |
| |
| /** Gets the Java-side thread object for this JavaThread */ |
| public Oop getThreadObj() { |
| Oop obj = null; |
| try { |
| obj = VM.getVM().getObjectHeap().newOop(threadObjField.getValue(addr)); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| return obj; |
| } |
| |
| /** Get the Java-side name of this thread */ |
| public String getThreadName() { |
| Oop threadObj = getThreadObj(); |
| if (threadObj == null) { |
| return "<null>"; |
| } |
| return OopUtilities.threadOopGetName(threadObj); |
| } |
| |
| // |
| // Oop traversal |
| // |
| |
| public void oopsDo(AddressVisitor oopVisitor) { |
| super.oopsDo(oopVisitor); |
| |
| // FIXME: add in the rest of the routine from the VM |
| |
| // Traverse the execution stack |
| for(StackFrameStream fst = new StackFrameStream(this); !fst.isDone(); fst.next()) { |
| fst.getCurrent().oopsDo(oopVisitor, fst.getRegisterMap()); |
| } |
| } |
| |
| public boolean isInStack(Address a) { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(VM.getVM().isDebugging(), "Not yet implemented for non-debugging system"); |
| } |
| Address sp = lastSPDbg(); |
| Address stackBase = getStackBase(); |
| // Be robust |
| if (sp == null) return false; |
| return stackBase.greaterThanOrEqual(a) && sp.lessThanOrEqual(a); |
| } |
| |
| public boolean isLockOwned(Address a) { |
| Address stackBase = getStackBase(); |
| Address stackLimit = stackBase.addOffsetTo(-getStackSize()); |
| |
| return stackBase.greaterThanOrEqual(a) && stackLimit.lessThanOrEqual(a); |
| |
| // FIXME: should traverse MonitorArray/MonitorChunks as in VM |
| } |
| |
| public Oop getCurrentParkBlocker() { |
| Oop threadObj = getThreadObj(); |
| if (threadObj != null) { |
| return OopUtilities.threadOopGetParkBlocker(threadObj); |
| } |
| return null; |
| } |
| |
| public void printInfoOn(PrintStream tty) { |
| |
| tty.println("State: " + getThreadState().toString()); |
| // Attempt to figure out the addresses covered by Java frames. |
| // NOTE: we should make this a method and let the Stackwalk panel use the result too. |
| // |
| sun.jvm.hotspot.runtime.Frame tmpFrame = getCurrentFrameGuess(); |
| if (tmpFrame != null ) { |
| Address sp = tmpFrame.getSP(); |
| Address maxSP = sp; |
| Address minSP = sp; |
| RegisterMap tmpMap = newRegisterMap(false); |
| while ((tmpFrame != null) && (!tmpFrame.isFirstFrame())) { |
| tmpFrame = tmpFrame.sender(tmpMap); |
| if (tmpFrame != null) { |
| sp = tmpFrame.getSP(); |
| maxSP = AddressOps.max(maxSP, sp); |
| minSP = AddressOps.min(minSP, sp); |
| } |
| } |
| tty.println("Stack in use by Java: " + minSP + " .. " + maxSP); |
| } else { |
| tty.println("No Java frames present"); |
| } |
| tty.println("Base of Stack: " + getStackBase()); |
| tty.println("Last_Java_SP: " + getLastJavaSP()); |
| tty.println("Last_Java_FP: " + getLastJavaFP()); |
| tty.println("Last_Java_PC: " + getLastJavaPC()); |
| // More stuff like saved_execption_pc, safepoint_state, ... |
| access.printInfoOn(addr, tty); |
| |
| } |
| |
| /////////////////////////////// |
| // // |
| // FIXME: add more accessors // |
| // // |
| /////////////////////////////// |
| |
| //-------------------------------------------------------------------------------- |
| // Internals only below this point |
| // |
| |
| private Frame cookLastFrame(Frame fr) { |
| if (fr == null) { |
| return null; |
| } |
| |
| Address pc = fr.getPC(); |
| |
| if (Assert.ASSERTS_ENABLED) { |
| if (pc == null) { |
| Assert.that(VM.getVM().isDebugging(), "must have PC"); |
| } |
| } |
| return fr; |
| } |
| |
| private Address lastSPDbg() { |
| return access.getLastSP(addr); |
| } |
| |
| } |
