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1 /*
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2 * Copyright 2002-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.jdi;
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26
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27 import com.sun.jdi.*;
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28 import sun.jvm.hotspot.oops.ObjectHeap;
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29 import sun.jvm.hotspot.debugger.OopHandle;
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30 import sun.jvm.hotspot.oops.Array;
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31 import sun.jvm.hotspot.oops.ObjArray;
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32 import sun.jvm.hotspot.oops.TypeArray;
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33 import sun.jvm.hotspot.oops.Instance;
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34 import sun.jvm.hotspot.runtime.BasicType;
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35 import sun.jvm.hotspot.runtime.JavaVFrame;
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36 import sun.jvm.hotspot.runtime.StackValue;
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37 import sun.jvm.hotspot.runtime.StackValueCollection;
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38 import sun.jvm.hotspot.utilities.Assert;
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39 import java.util.List;
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40 import java.util.Map;
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41 import java.util.ArrayList;
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42 import java.util.HashMap;
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43 import java.util.Iterator;
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44 import java.util.Collections;
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45
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46 public class StackFrameImpl extends MirrorImpl
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47 implements StackFrame
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48 {
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49 /* Once false, frame should not be used.
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50 * access synchronized on (vm.state())
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51 */
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52 private boolean isValid = true;
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53
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54 private final ThreadReferenceImpl thread;
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55 private final JavaVFrame saFrame;
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56 private final Location location;
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57 private Map visibleVariables = null;
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58 private ObjectReference thisObject = null;
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59
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60 StackFrameImpl(VirtualMachine vm, ThreadReferenceImpl thread,
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61 JavaVFrame jvf) {
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62 super(vm);
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63 this.thread = thread;
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64 this.saFrame = jvf;
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65
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66 sun.jvm.hotspot.oops.Method SAMethod = jvf.getMethod();
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67
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68 ReferenceType rt = ((VirtualMachineImpl)vm).referenceType(SAMethod.getMethodHolder());
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69
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70 this.location = new LocationImpl(vm, rt, SAMethod, (long)jvf.getBCI());
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71 }
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72
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73 private void validateStackFrame() {
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74 if (!isValid) {
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75 throw new InvalidStackFrameException("Thread has been resumed");
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76 }
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77 }
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78
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79 JavaVFrame getJavaVFrame() {
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80 return saFrame;
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81 }
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82
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83 /**
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84 * Return the frame location.
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85 * Need not be synchronized since it cannot be provably stale.
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86 */
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87 public Location location() {
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88 validateStackFrame();
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89 return location;
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90 }
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91
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92 /**
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93 * Return the thread holding the frame.
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94 * Need not be synchronized since it cannot be provably stale.
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95 */
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96 public ThreadReference thread() {
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97 validateStackFrame();
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98 return thread;
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99 }
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100
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101 public boolean equals(Object obj) {
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102 if ((obj != null) && (obj instanceof StackFrameImpl)) {
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103 StackFrameImpl other = (StackFrameImpl)obj;
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104 return (saFrame.equals(other.saFrame));
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105 } else {
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106 return false;
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107 }
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108 }
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109
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110 public int hashCode() {
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111 return saFrame.hashCode();
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112 }
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113
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114 public ObjectReference thisObject() {
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115 validateStackFrame();
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116 MethodImpl currentMethod = (MethodImpl)location.method();
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117 if (currentMethod.isStatic() || currentMethod.isNative()) {
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118 return null;
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119 }
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120 if (thisObject == null) {
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121 StackValueCollection values = saFrame.getLocals();
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122 if (Assert.ASSERTS_ENABLED) {
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123 Assert.that(values.size() > 0, "this is missing");
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124 }
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125 // 'this' at index 0.
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126 OopHandle handle = values.oopHandleAt(0);
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127 ObjectHeap heap = vm.saObjectHeap();
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128 thisObject = vm.objectMirror(heap.newOop(handle));
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129 }
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130 return thisObject;
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131 }
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132
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133 /**
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134 * Build the visible variable map.
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135 * Need not be synchronized since it cannot be provably stale.
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136 */
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137 private void createVisibleVariables() throws AbsentInformationException {
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138 if (visibleVariables == null) {
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139 List allVariables = location.method().variables();
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140 Map map = new HashMap(allVariables.size());
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141
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142 Iterator iter = allVariables.iterator();
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143 while (iter.hasNext()) {
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144 LocalVariableImpl variable = (LocalVariableImpl)iter.next();
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145 String name = variable.name();
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146 if (variable.isVisible(this)) {
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147 LocalVariable existing = (LocalVariable)map.get(name);
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148 if ((existing == null) ||
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149 variable.hides(existing)) {
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150 map.put(name, variable);
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151 }
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152 }
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153 }
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154 visibleVariables = map;
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155 }
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156 }
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157
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158 /**
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159 * Return the list of visible variable in the frame.
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160 * Need not be synchronized since it cannot be provably stale.
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161 */
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162 public List visibleVariables() throws AbsentInformationException {
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163 validateStackFrame();
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164 createVisibleVariables();
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165 List mapAsList = new ArrayList(visibleVariables.values());
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166 Collections.sort(mapAsList);
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167 return mapAsList;
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168 }
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169
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170 /**
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171 * Return a particular variable in the frame.
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172 * Need not be synchronized since it cannot be provably stale.
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173 */
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174 public LocalVariable visibleVariableByName(String name) throws AbsentInformationException {
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175 validateStackFrame();
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176 createVisibleVariables();
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177 return (LocalVariable)visibleVariables.get(name);
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178 }
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179
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180 public Value getValue(LocalVariable variable) {
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181 List list = new ArrayList(1);
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182 list.add(variable);
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183 Map map = getValues(list);
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184 return (Value)map.get(variable);
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185 }
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186
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187 public Map getValues(List variables) {
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188 validateStackFrame();
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189 StackValueCollection values = saFrame.getLocals();
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190
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191 int count = variables.size();
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192 Map map = new HashMap(count);
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193 for (int ii=0; ii<count; ++ii) {
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194 LocalVariableImpl variable = (LocalVariableImpl)variables.get(ii);
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195 if (!variable.isVisible(this)) {
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196 throw new IllegalArgumentException(variable.name() +
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197 " is not valid at this frame location");
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198 }
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199 ValueImpl valueImpl;
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200 int ss = variable.slot();
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201 char c = variable.signature().charAt(0);
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202 BasicType variableType = BasicType.charToBasicType(c);
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203 valueImpl = getSlotValue(values, variableType, ss);
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204 map.put(variable, valueImpl);
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205 }
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206 return map;
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207 }
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208
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209 public List getArgumentValues() {
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210 validateStackFrame();
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211 StackValueCollection values = saFrame.getLocals();
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212 MethodImpl mmm = (MethodImpl)location.method();
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213 List argSigs = mmm.argumentSignatures();
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214 int count = argSigs.size();
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215 List res = new ArrayList(0);
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216
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217 int slot = mmm.isStatic()? 0 : 1;
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218 for (int ii = 0; ii < count; ++slot, ++ii) {
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219 char sigChar = ((String)argSigs.get(ii)).charAt(0);
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220 BasicType variableType = BasicType.charToBasicType(sigChar);
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221 res.add(getSlotValue(values, variableType, slot));
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222 if (sigChar == 'J' || sigChar == 'D') {
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223 slot++;
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224 }
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225 }
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226 return res;
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227 }
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228
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229 private ValueImpl getSlotValue(StackValueCollection values,
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230 BasicType variableType, int ss) {
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231 ValueImpl valueImpl = null;
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232 OopHandle handle = null;
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233 ObjectHeap heap = vm.saObjectHeap();
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234 if (variableType == BasicType.T_BOOLEAN) {
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235 valueImpl = (BooleanValueImpl) vm.mirrorOf(values.booleanAt(ss));
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236 } else if (variableType == BasicType.T_CHAR) {
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237 valueImpl = (CharValueImpl) vm.mirrorOf(values.charAt(ss));
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238 } else if (variableType == BasicType.T_FLOAT) {
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239 valueImpl = (FloatValueImpl) vm.mirrorOf(values.floatAt(ss));
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240 } else if (variableType == BasicType.T_DOUBLE) {
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241 valueImpl = (DoubleValueImpl) vm.mirrorOf(values.doubleAt(ss));
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242 } else if (variableType == BasicType.T_BYTE) {
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243 valueImpl = (ByteValueImpl) vm.mirrorOf(values.byteAt(ss));
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244 } else if (variableType == BasicType.T_SHORT) {
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245 valueImpl = (ShortValueImpl) vm.mirrorOf(values.shortAt(ss));
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246 } else if (variableType == BasicType.T_INT) {
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247 valueImpl = (IntegerValueImpl) vm.mirrorOf(values.intAt(ss));
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248 } else if (variableType == BasicType.T_LONG) {
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249 valueImpl = (LongValueImpl) vm.mirrorOf(values.longAt(ss));
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250 } else if (variableType == BasicType.T_OBJECT) {
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251 // we may have an [Ljava/lang/Object; - i.e., Object[] with the
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252 // elements themselves may be arrays because every array is an Object.
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253 handle = values.oopHandleAt(ss);
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254 valueImpl = (ObjectReferenceImpl) vm.objectMirror(heap.newOop(handle));
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255 } else if (variableType == BasicType.T_ARRAY) {
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256 handle = values.oopHandleAt(ss);
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257 valueImpl = vm.arrayMirror((Array)heap.newOop(handle));
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258 } else if (variableType == BasicType.T_VOID) {
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259 valueImpl = new VoidValueImpl(vm);
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260 } else {
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261 throw new RuntimeException("Should not read here");
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262 }
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263
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264 return valueImpl;
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265 }
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266
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267 public void setValue(LocalVariable variableIntf, Value valueIntf)
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268 throws InvalidTypeException, ClassNotLoadedException {
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269
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270 vm.throwNotReadOnlyException("StackFrame.setValue()");
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271 }
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272
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273 public String toString() {
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274 return location.toString() + " in thread " + thread.toString();
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275 }
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276 }
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