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/*
* Copyright (c) 2000, 2006, 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.solaris_sparc;
import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.sparc.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.runtime.sparc.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;
public class SolarisSPARCJavaThreadPDAccess implements JavaThreadPDAccess {
private static AddressField baseOfStackPointerField;
private static AddressField postJavaStateField;
private static AddressField osThreadField;
private static int isPC;
private static int hasFlushed;
// Field from OSThread
private static CIntegerField osThreadThreadIDField;
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");
baseOfStackPointerField = type.getAddressField("_base_of_stack_pointer");
osThreadField = type.getAddressField("_osthread");
hasFlushed = db.lookupIntConstant("JavaFrameAnchor::flushed").intValue();
type = db.lookupType("OSThread");
osThreadThreadIDField = type.getCIntegerField("_thread_id");
}
public Address getLastJavaFP(Address addr) {
return null;
}
public Address getLastJavaPC(Address addr) {
return null;
}
public Address getBaseOfStackPointer(Address addr) {
return baseOfStackPointerField.getValue(addr);
}
public Frame getLastFramePD(JavaThread thread, Address addr) {
// This assert doesn't work in the debugging case for threads
// which are running Java code and which haven't re-entered the
// runtime (e.g., through a Method.invoke() or otherwise). They
// haven't yet "decached" their last Java stack pointer to the
// thread.
// if (Assert.ASSERTS_ENABLED) {
// Assert.that(hasLastJavaFrame(), "must have last_Java_sp() when suspended");
// // FIXME: add assertion about flushing register windows for runtime system
// // (not appropriate for debugging system, though, unless at safepoin t)
// }
// FIXME: I don't think this is necessary, but might be useful
// while debugging
if (thread.getLastJavaSP() == null) {
return null;
}
// sparc does a lazy window flush. The _flags field of the JavaFrameAnchor
// encodes whether the windows have flushed. Whenever the windows have flushed
// there will be a last_Java_pc.
// In a relective system we'd have to do something to force the thread to flush
// its windows and give us the pc (or the younger_sp so we can find it ourselves)
// In a debugger situation (process or core) the flush should have happened and
// so if we don't have the younger sp we can find it
//
if (thread.getLastJavaPC() != null) {
return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), thread.getLastJavaPC());
} else {
Frame top = getCurrentFrameGuess(thread, addr);
return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()),
SPARCFrame.biasSP(SPARCFrame.findYoungerSP(top.getSP(), thread.getLastJavaSP())),
false);
}
}
public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {
return new SPARCRegisterMap(thread, updateMap);
}
public Frame getCurrentFrameGuess(JavaThread thread, Address addr) {
// If java stack is walkable then both last_Java_sp and last_Java_pc are
// non null and we can start stack walk from this frame.
if (thread.getLastJavaSP() != null && thread.getLastJavaPC() != null) {
return new SPARCFrame(SPARCFrame.biasSP(thread.getLastJavaSP()), thread.getLastJavaPC());
}
ThreadProxy t = getThreadProxy(addr);
SPARCThreadContext context = (SPARCThreadContext) t.getContext();
// For now, let's see what happens if we do a similar thing to
// what the runtime code does. I suspect this may cause us to lose
// the top frame from the stack.
Address sp = context.getRegisterAsAddress(SPARCThreadContext.R_SP);
Address pc = context.getRegisterAsAddress(SPARCThreadContext.R_PC);
if ((sp == null) || (pc == null)) {
// Problems (have not hit this case so far, but would be bad to continue if we did)
return null;
}
return new SPARCFrame(sp, pc);
}
public void printThreadIDOn(Address addr, PrintStream tty) {
tty.print(getThreadProxy(addr));
}
public Address getLastSP(Address addr) {
ThreadProxy t = getThreadProxy(addr);
SPARCThreadContext context = (SPARCThreadContext) t.getContext();
return SPARCFrame.unBiasSP(context.getRegisterAsAddress(SPARCThreadContext.R_SP));
}
public void printInfoOn(Address threadAddr, PrintStream tty) {
}
public ThreadProxy getThreadProxy(Address addr) {
// 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 tidAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset());
JVMDebugger debugger = VM.getVM().getDebugger();
return debugger.getThreadForIdentifierAddress(tidAddr);
}
}
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