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1 /*
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2 * Copyright 1999-2007 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 //
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26 // Forward Declarations
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27 //
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28
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29 class JvmtiRawMonitor;
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30 class JvmtiBreakpoint;
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31 class JvmtiBreakpoints;
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32
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33
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34 ///////////////////////////////////////////////////////////////
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35 //
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36 // class GrowableCache, GrowableElement
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37 // Used by : JvmtiBreakpointCache
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38 // Used by JVMTI methods: none directly.
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39 //
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40 // GrowableCache is a permanent CHeap growable array of <GrowableElement *>
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41 //
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42 // In addition, the GrowableCache maintains a NULL terminated cache array of type address
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43 // that's created from the element array using the function:
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44 // address GrowableElement::getCacheValue().
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45 //
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46 // Whenever the GrowableArray changes size, the cache array gets recomputed into a new C_HEAP allocated
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47 // block of memory. Additionally, every time the cache changes its position in memory, the
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48 // void (*_listener_fun)(void *this_obj, address* cache)
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49 // gets called with the cache's new address. This gives the user of the GrowableCache a callback
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50 // to update its pointer to the address cache.
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51 //
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52
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53 class GrowableElement : public CHeapObj {
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54 public:
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55 virtual address getCacheValue() =0;
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56 virtual bool equals(GrowableElement* e) =0;
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57 virtual bool lessThan(GrowableElement *e)=0;
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58 virtual GrowableElement *clone() =0;
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59 virtual void oops_do(OopClosure* f) =0;
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60 };
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61
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62 class GrowableCache VALUE_OBJ_CLASS_SPEC {
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63
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64 private:
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65 // Object pointer passed into cache & listener functions.
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66 void *_this_obj;
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67
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68 // Array of elements in the collection
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69 GrowableArray<GrowableElement *> *_elements;
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70
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71 // Parallel array of cached values
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72 address *_cache;
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73
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74 // Listener for changes to the _cache field.
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75 // Called whenever the _cache field has it's value changed
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76 // (but NOT when cached elements are recomputed).
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77 void (*_listener_fun)(void *, address*);
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78
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79 static bool equals(void *, GrowableElement *);
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80
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81 // recache all elements after size change, notify listener
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82 void recache();
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83
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84 public:
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85 GrowableCache();
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86 ~GrowableCache();
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87
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88 void initialize(void *this_obj, void listener_fun(void *, address*) );
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89
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90 // number of elements in the collection
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91 int length();
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92 // get the value of the index element in the collection
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93 GrowableElement* at(int index);
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94 // find the index of the element, -1 if it doesn't exist
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95 int find(GrowableElement* e);
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96 // append a copy of the element to the end of the collection, notify listener
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97 void append(GrowableElement* e);
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98 // insert a copy of the element using lessthan(), notify listener
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99 void insert(GrowableElement* e);
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100 // remove the element at index, notify listener
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101 void remove (int index);
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102 // clear out all elements and release all heap space, notify listener
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103 void clear();
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104 // apply f to every element and update the cache
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105 void oops_do(OopClosure* f);
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106 void gc_epilogue();
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107 };
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108
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109
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110 ///////////////////////////////////////////////////////////////
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111 //
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112 // class JvmtiBreakpointCache
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113 // Used by : JvmtiBreakpoints
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114 // Used by JVMTI methods: none directly.
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115 // Note : typesafe wrapper for GrowableCache of JvmtiBreakpoint
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116 //
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117
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118 class JvmtiBreakpointCache : public CHeapObj {
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119
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120 private:
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121 GrowableCache _cache;
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122
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123 public:
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124 JvmtiBreakpointCache() {}
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125 ~JvmtiBreakpointCache() {}
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126
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127 void initialize(void *this_obj, void listener_fun(void *, address*) ) {
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128 _cache.initialize(this_obj,listener_fun);
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129 }
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130
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131 int length() { return _cache.length(); }
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132 JvmtiBreakpoint& at(int index) { return (JvmtiBreakpoint&) *(_cache.at(index)); }
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133 int find(JvmtiBreakpoint& e) { return _cache.find((GrowableElement *) &e); }
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134 void append(JvmtiBreakpoint& e) { _cache.append((GrowableElement *) &e); }
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135 void remove (int index) { _cache.remove(index); }
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136 void clear() { _cache.clear(); }
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137 void oops_do(OopClosure* f) { _cache.oops_do(f); }
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138 void gc_epilogue() { _cache.gc_epilogue(); }
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139 };
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140
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141
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142 ///////////////////////////////////////////////////////////////
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143 //
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144 // class JvmtiBreakpoint
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145 // Used by : JvmtiBreakpoints
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146 // Used by JVMTI methods: SetBreakpoint, ClearBreakpoint, ClearAllBreakpoints
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147 // Note: Extends GrowableElement for use in a GrowableCache
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148 //
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149 // A JvmtiBreakpoint describes a location (class, method, bci) to break at.
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150 //
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151
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152 typedef void (methodOopDesc::*method_action)(int _bci);
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153
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154 class JvmtiBreakpoint : public GrowableElement {
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155 private:
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156 methodOop _method;
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157 int _bci;
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158 Bytecodes::Code _orig_bytecode;
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159
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160 public:
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161 JvmtiBreakpoint();
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162 JvmtiBreakpoint(methodOop m_method, jlocation location);
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163 bool equals(JvmtiBreakpoint& bp);
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164 bool lessThan(JvmtiBreakpoint &bp);
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165 void copy(JvmtiBreakpoint& bp);
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166 bool is_valid();
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167 address getBcp();
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168 void each_method_version_do(method_action meth_act);
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169 void set();
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170 void clear();
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171 void print();
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172
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173 methodOop method() { return _method; }
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174
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175 // GrowableElement implementation
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176 address getCacheValue() { return getBcp(); }
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177 bool lessThan(GrowableElement* e) { Unimplemented(); return false; }
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178 bool equals(GrowableElement* e) { return equals((JvmtiBreakpoint&) *e); }
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179 void oops_do(OopClosure* f) { f->do_oop((oop *) &_method); }
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180 GrowableElement *clone() {
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181 JvmtiBreakpoint *bp = new JvmtiBreakpoint();
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182 bp->copy(*this);
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183 return bp;
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184 }
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185 };
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186
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187
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188 ///////////////////////////////////////////////////////////////
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189 //
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190 // class VM_ChangeBreakpoints
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191 // Used by : JvmtiBreakpoints
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192 // Used by JVMTI methods: none directly.
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193 // Note: A Helper class.
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194 //
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195 // VM_ChangeBreakpoints implements a VM_Operation for ALL modifications to the JvmtiBreakpoints class.
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196 //
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197
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198 class VM_ChangeBreakpoints : public VM_Operation {
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199 private:
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200 JvmtiBreakpoints* _breakpoints;
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201 int _operation;
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202 JvmtiBreakpoint* _bp;
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203
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204 public:
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205 enum { SET_BREAKPOINT=0, CLEAR_BREAKPOINT=1, CLEAR_ALL_BREAKPOINT=2 };
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206
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207 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation) {
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208 _breakpoints = breakpoints;
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209 _bp = NULL;
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210 _operation = operation;
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211 assert(breakpoints != NULL, "breakpoints != NULL");
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212 assert(operation == CLEAR_ALL_BREAKPOINT, "unknown breakpoint operation");
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213 }
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214 VM_ChangeBreakpoints(JvmtiBreakpoints* breakpoints, int operation, JvmtiBreakpoint *bp) {
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215 _breakpoints = breakpoints;
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216 _bp = bp;
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217 _operation = operation;
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218 assert(breakpoints != NULL, "breakpoints != NULL");
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219 assert(bp != NULL, "bp != NULL");
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220 assert(operation == SET_BREAKPOINT || operation == CLEAR_BREAKPOINT , "unknown breakpoint operation");
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221 }
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222
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223 VMOp_Type type() const { return VMOp_ChangeBreakpoints; }
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224 void doit();
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225 void oops_do(OopClosure* f);
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226 };
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227
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228
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229 ///////////////////////////////////////////////////////////////
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230 //
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231 // class JvmtiBreakpoints
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232 // Used by : JvmtiCurrentBreakpoints
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233 // Used by JVMTI methods: none directly
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234 // Note: A Helper class
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235 //
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236 // JvmtiBreakpoints is a GrowableCache of JvmtiBreakpoint.
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237 // All changes to the GrowableCache occur at a safepoint using VM_ChangeBreakpoints.
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238 //
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239 // Because _bps is only modified at safepoints, its possible to always use the
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240 // cached byte code pointers from _bps without doing any synchronization (see JvmtiCurrentBreakpoints).
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241 //
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242 // It would be possible to make JvmtiBreakpoints a static class, but I've made it
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243 // CHeap allocated to emphasize its similarity to JvmtiFramePops.
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244 //
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245
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246 class JvmtiBreakpoints : public CHeapObj {
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247 private:
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248
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249 JvmtiBreakpointCache _bps;
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250
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251 // These should only be used by VM_ChangeBreakpoints
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252 // to insure they only occur at safepoints.
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253 // Todo: add checks for safepoint
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254 friend class VM_ChangeBreakpoints;
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255 void set_at_safepoint(JvmtiBreakpoint& bp);
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256 void clear_at_safepoint(JvmtiBreakpoint& bp);
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257 void clearall_at_safepoint();
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258
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259 static void do_element(GrowableElement *e);
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260
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261 public:
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262 JvmtiBreakpoints(void listener_fun(void *, address *));
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263 ~JvmtiBreakpoints();
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264
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265 int length();
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266 void oops_do(OopClosure* f);
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267 void gc_epilogue();
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268 void print();
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269
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270 int set(JvmtiBreakpoint& bp);
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271 int clear(JvmtiBreakpoint& bp);
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272 void clearall_in_class_at_safepoint(klassOop klass);
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273 void clearall();
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274 };
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275
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276
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277 ///////////////////////////////////////////////////////////////
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278 //
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279 // class JvmtiCurrentBreakpoints
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280 //
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281 // A static wrapper class for the JvmtiBreakpoints that provides:
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282 // 1. a fast inlined function to check if a byte code pointer is a breakpoint (is_breakpoint).
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283 // 2. a function for lazily creating the JvmtiBreakpoints class (this is not strictly necessary,
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284 // but I'm copying the code from JvmtiThreadState which needs to lazily initialize
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285 // JvmtiFramePops).
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286 // 3. An oops_do entry point for GC'ing the breakpoint array.
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287 //
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288
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289 class JvmtiCurrentBreakpoints : public AllStatic {
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290
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291 private:
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292
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293 // Current breakpoints, lazily initialized by get_jvmti_breakpoints();
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294 static JvmtiBreakpoints *_jvmti_breakpoints;
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295
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296 // NULL terminated cache of byte-code pointers corresponding to current breakpoints.
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297 // Updated only at safepoints (with listener_fun) when the cache is moved.
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298 // It exists only to make is_breakpoint fast.
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299 static address *_breakpoint_list;
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300 static inline void set_breakpoint_list(address *breakpoint_list) { _breakpoint_list = breakpoint_list; }
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301 static inline address *get_breakpoint_list() { return _breakpoint_list; }
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302
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303 // Listener for the GrowableCache in _jvmti_breakpoints, updates _breakpoint_list.
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304 static void listener_fun(void *this_obj, address *cache);
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305
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306 public:
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307 static void initialize();
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308 static void destroy();
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309
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310 // lazily create _jvmti_breakpoints and _breakpoint_list
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311 static JvmtiBreakpoints& get_jvmti_breakpoints();
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312
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313 // quickly test whether the bcp matches a cached breakpoint in the list
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314 static inline bool is_breakpoint(address bcp);
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315
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316 static void oops_do(OopClosure* f);
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317 static void gc_epilogue();
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318 };
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319
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320 // quickly test whether the bcp matches a cached breakpoint in the list
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321 bool JvmtiCurrentBreakpoints::is_breakpoint(address bcp) {
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322 address *bps = get_breakpoint_list();
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323 if (bps == NULL) return false;
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324 for ( ; (*bps) != NULL; bps++) {
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325 if ((*bps) == bcp) return true;
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326 }
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327 return false;
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328 }
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329
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330
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331 ///////////////////////////////////////////////////////////////
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332 //
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333 // class JvmtiRawMonitor
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334 //
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335 // Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.)
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336 //
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337 // Wrapper for ObjectMonitor class that saves the Monitor's name
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338 //
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339
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340 class JvmtiRawMonitor : public ObjectMonitor {
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341 private:
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342 int _magic;
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343 char * _name;
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344 // JVMTI_RM_MAGIC is set in contructor and unset in destructor.
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345 enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') };
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346
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347 public:
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348 JvmtiRawMonitor(const char *name);
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349 ~JvmtiRawMonitor();
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350 int magic() { return _magic; }
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351 const char *get_name() { return _name; }
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352 bool is_valid() { return _magic == JVMTI_RM_MAGIC; }
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353 };
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354
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355 // Onload pending raw monitors
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356 // Class is used to cache onload or onstart monitor enter
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357 // which will transition into real monitor when
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358 // VM is fully initialized.
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359 class JvmtiPendingMonitors : public AllStatic {
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360
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361 private:
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362 static GrowableArray<JvmtiRawMonitor*> *_monitors; // Cache raw monitor enter
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363
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364 inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; }
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365
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366 static void dispose() {
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367 delete monitors();
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368 }
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369
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370 public:
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371 static void enter(JvmtiRawMonitor *monitor) {
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372 monitors()->append(monitor);
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373 }
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374
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375 static int count() {
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376 return monitors()->length();
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377 }
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378
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379 static void destroy(JvmtiRawMonitor *monitor) {
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380 while (monitors()->contains(monitor)) {
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381 monitors()->remove(monitor);
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382 }
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383 }
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384
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385 // Return false if monitor is not found in the list.
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386 static bool exit(JvmtiRawMonitor *monitor) {
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387 if (monitors()->contains(monitor)) {
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388 monitors()->remove(monitor);
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389 return true;
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390 } else {
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391 return false;
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392 }
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393 }
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394
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395 static void transition_raw_monitors();
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396 };
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397
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398
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399
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400 ///////////////////////////////////////////////////////////////
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401 // The get/set local operations must only be done by the VM thread
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402 // because the interpreter version needs to access oop maps, which can
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403 // only safely be done by the VM thread
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404 //
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405 // I'm told that in 1.5 oop maps are now protected by a lock and
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406 // we could get rid of the VM op
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407 // However if the VM op is removed then the target thread must
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408 // be suspended AND a lock will be needed to prevent concurrent
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409 // setting of locals to the same java thread. This lock is needed
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410 // to prevent compiledVFrames from trying to add deferred updates
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411 // to the thread simultaneously.
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412 //
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413 class VM_GetOrSetLocal : public VM_Operation {
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414 private:
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415 JavaThread* _thread;
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416 JavaThread* _calling_thread;
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417 jint _depth;
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418 jint _index;
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419 BasicType _type;
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420 jvalue _value;
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421 javaVFrame* _jvf;
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422 bool _set;
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423
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424 jvmtiError _result;
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425
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426 vframe* get_vframe();
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427 javaVFrame* get_java_vframe();
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428 bool check_slot_type(javaVFrame* vf);
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429
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430 public:
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431 // Constructor for non-object getter
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432 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type);
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433
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434 // Constructor for object or non-object setter
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435 VM_GetOrSetLocal(JavaThread* thread, jint depth, jint index, BasicType type, jvalue value);
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436
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437 // Constructor for object getter
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438 VM_GetOrSetLocal(JavaThread* thread, JavaThread* calling_thread, jint depth,
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439 int index);
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440
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441 VMOp_Type type() const { return VMOp_GetOrSetLocal; }
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442 jvalue value() { return _value; }
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443 jvmtiError result() { return _result; }
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444
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445 bool doit_prologue();
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446 void doit();
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447 bool allow_nested_vm_operations() const;
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448 const char* name() const { return "get/set locals"; }
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449
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450 // Check that the klass is assignable to a type with the given signature.
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451 static bool is_assignable(const char* ty_sign, Klass* klass, Thread* thread);
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452 };
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453
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454
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455 ///////////////////////////////////////////////////////////////
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456 //
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457 // class JvmtiSuspendControl
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458 //
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459 // Convenience routines for suspending and resuming threads.
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460 //
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461 // All attempts by JVMTI to suspend and resume threads must go through the
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462 // JvmtiSuspendControl interface.
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463 //
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464 // methods return true if successful
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465 //
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466 class JvmtiSuspendControl : public AllStatic {
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467 public:
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468 // suspend the thread, taking it to a safepoint
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469 static bool suspend(JavaThread *java_thread);
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470 // resume the thread
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471 static bool resume(JavaThread *java_thread);
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472
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473 static void print();
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474 };
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475
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476 // Utility macro that checks for NULL pointers:
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477 #define NULL_CHECK(X, Y) if ((X) == NULL) { return (Y); }
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