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 }