1 /* 2 * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.runtime; 26 27 import java.util.*; 28 import sun.jvm.hotspot.debugger.*; 29 import sun.jvm.hotspot.interpreter.*; 30 import sun.jvm.hotspot.oops.*; 31 import sun.jvm.hotspot.utilities.*; 32 33 public class InterpretedVFrame extends JavaVFrame { 34 /** JVM state */ 35 public Method getMethod() { 36 return getFrame().getInterpreterFrameMethod(); 37 } 38 39 public StackValueCollection getLocals() { 40 Method m = getMethod(); 41 42 int length = (int) m.getMaxLocals(); 43 44 if (m.isNative()) { 45 // If the method is native, getMaxLocals is not telling the truth. 46 // maxlocals then equals the size of parameters 47 length = (int) m.getSizeOfParameters(); 48 } 49 50 StackValueCollection result = new StackValueCollection(length); 51 52 // Get oopmap describing oops and int for current bci 53 OopMapCacheEntry oopMask = getMethod().getMaskFor(getBCI()); 54 55 // handle locals 56 for(int i = 0; i < length; i++) { 57 // Find stack location 58 Address addr = addressOfLocalAt(i); 59 60 // Depending on oop/int put it in the right package 61 StackValue sv; 62 if (oopMask.isOop(i)) { 63 // oop value 64 sv = new StackValue(addr.getOopHandleAt(0), 0); 65 } else { 66 // integer 67 // Fetch a signed integer the size of a stack slot 68 sv = new StackValue(addr.getCIntegerAt(0, VM.getVM().getAddressSize(), false)); 69 } 70 result.add(sv); 71 } 72 73 return result; 74 } 75 76 public StackValueCollection getExpressions() { 77 int length = getFrame().getInterpreterFrameExpressionStackSize(); 78 79 if (getMethod().isNative()) { 80 // If the method is native, there is no expression stack 81 length = 0; 82 } 83 84 int nofLocals = (int) getMethod().getMaxLocals(); 85 StackValueCollection result = new StackValueCollection(length); 86 87 // Get oopmap describing oops and int for current bci 88 OopMapCacheEntry oopMask = getMethod().getMaskFor(getBCI()); 89 90 for(int i = 0; i < length; i++) { 91 // Find stack location 92 Address addr = addressOfExpressionStackAt(i); 93 94 // Depending on oop/int put it in the right package 95 StackValue sv; 96 if (oopMask.isOop(i + nofLocals)) { 97 // oop value 98 sv = new StackValue(addr.getOopHandleAt(0), 0); 99 } else { 100 // integer 101 // Fetch a signed integer the size of a stack slot 102 sv = new StackValue(addr.getCIntegerAt(0, VM.getVM().getAddressSize(), false)); 103 } 104 result.add(sv); 105 } 106 107 return result; 108 } 109 110 /** Returns List<MonitorInfo> */ 111 public List<MonitorInfo> getMonitors() { 112 List<MonitorInfo> result = new ArrayList<>(5); 113 for (BasicObjectLock current = getFrame().interpreterFrameMonitorEnd(); 114 current.address().lessThan(getFrame().interpreterFrameMonitorBegin().address()); 115 current = getFrame().nextMonitorInInterpreterFrame(current)) { 116 result.add(new MonitorInfo(current.obj(), current.lock(), false, false)); 117 } 118 return result; 119 } 120 121 /** Test operation */ 122 public boolean isInterpretedFrame() { return true; } 123 124 /** Package-internal constructor */ 125 InterpretedVFrame(Frame fr, RegisterMap regMap, JavaThread thread) { 126 super(fr, regMap, thread); 127 } 128 129 /** Accessor for Byte Code Index (NOTE: access to BCP is not allowed 130 in this system; see Frame.java) */ 131 public int getBCI() { 132 return getFrame().getInterpreterFrameBCI(); 133 } 134 135 /** Setter for Byte Code Index */ 136 // FIXME: not yet implementable 137 // public void setBCI(int bci) { 138 // getFrame().setInterpreterFrameBCI(bci); 139 // } 140 141 public void verify() { 142 } 143 144 //-------------------------------------------------------------------------------- 145 // Internals only below this point 146 // 147 148 private Address addressOfLocalAt(int index) { 149 if (Assert.ASSERTS_ENABLED) { 150 Assert.that(getFrame().isInterpretedFrame(), "frame should be an interpreted frame"); 151 } 152 return fr.addressOfInterpreterFrameLocal(index); 153 } 154 155 private Address addressOfExpressionStackAt(int index) { 156 return fr.addressOfInterpreterFrameExpressionStackSlot(index); 157 } 158 }