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/*
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* Copyright 2000-2001 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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package sun.jvm.hotspot.runtime;
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import java.util.*;
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import sun.jvm.hotspot.debugger.*;
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import sun.jvm.hotspot.interpreter.*;
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import sun.jvm.hotspot.oops.*;
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import sun.jvm.hotspot.utilities.*;
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public class InterpretedVFrame extends JavaVFrame {
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/** JVM state */
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public Method getMethod() {
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return getFrame().getInterpreterFrameMethod();
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}
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public StackValueCollection getLocals() {
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Method m = getMethod();
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int length = (int) m.getMaxLocals();
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if (m.isNative()) {
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// If the method is native, getMaxLocals is not telling the truth.
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// maxlocals then equals the size of parameters
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length = (int) m.getSizeOfParameters();
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}
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StackValueCollection result = new StackValueCollection(length);
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// Get oopmap describing oops and int for current bci
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OopMapCacheEntry oopMask = getMethod().getMaskFor(getBCI());
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// handle locals
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for(int i = 0; i < length; i++) {
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// Find stack location
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Address addr = addressOfLocalAt(i);
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// Depending on oop/int put it in the right package
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StackValue sv;
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if (oopMask.isOop(i)) {
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// oop value
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sv = new StackValue(addr.getOopHandleAt(0));
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} else {
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// integer
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// Fetch a signed integer the size of a stack slot
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sv = new StackValue(addr.getCIntegerAt(0, VM.getVM().getAddressSize(), false));
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}
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result.add(sv);
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}
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return result;
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}
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public StackValueCollection getExpressions() {
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int length = getFrame().getInterpreterFrameExpressionStackSize();
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if (getMethod().isNative()) {
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// If the method is native, there is no expression stack
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length = 0;
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}
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int nofLocals = (int) getMethod().getMaxLocals();
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StackValueCollection result = new StackValueCollection(length);
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// Get oopmap describing oops and int for current bci
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OopMapCacheEntry oopMask = getMethod().getMaskFor(getBCI());
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for(int i = 0; i < length; i++) {
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// Find stack location
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Address addr = addressOfExpressionStackAt(i);
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// Depending on oop/int put it in the right package
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StackValue sv;
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if (oopMask.isOop(i + nofLocals)) {
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// oop value
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sv = new StackValue(addr.getOopHandleAt(0));
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} else {
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// integer
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// Fetch a signed integer the size of a stack slot
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sv = new StackValue(addr.getCIntegerAt(0, VM.getVM().getAddressSize(), false));
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}
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result.add(sv);
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}
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return result;
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}
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/** Returns List<MonitorInfo> */
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public List getMonitors() {
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List result = new ArrayList(5);
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for (BasicObjectLock current = getFrame().interpreterFrameMonitorEnd();
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current.address().lessThan(getFrame().interpreterFrameMonitorBegin().address());
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current = getFrame().nextMonitorInInterpreterFrame(current)) {
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result.add(new MonitorInfo(current.obj(), current.lock()));
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}
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return result;
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}
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/** Test operation */
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public boolean isInterpretedFrame() { return true; }
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/** Package-internal constructor */
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InterpretedVFrame(Frame fr, RegisterMap regMap, JavaThread thread) {
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super(fr, regMap, thread);
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}
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/** Accessor for Byte Code Index (NOTE: access to BCP is not allowed
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in this system; see Frame.java) */
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public int getBCI() {
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return getFrame().getInterpreterFrameBCI();
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}
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/** Setter for Byte Code Index */
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// FIXME: not yet implementable
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// public void setBCI(int bci) {
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// getFrame().setInterpreterFrameBCI(bci);
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// }
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public void verify() {
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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 Address addressOfLocalAt(int index) {
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(getFrame().isInterpretedFrame(), "frame should be an interpreted frame");
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}
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return fr.addressOfInterpreterFrameLocal(index);
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}
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private Address addressOfExpressionStackAt(int index) {
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return fr.addressOfInterpreterFrameExpressionStackSlot(index);
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}
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}
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