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1 /*
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2 * Copyright 1997-2007 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 // A vframeArray is an array used for momentarily storing off stack Java method activations
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26 // during deoptimization. Essentially it is an array of vframes where each vframe
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27 // data is stored off stack. This structure will never exist across a safepoint so
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28 // there is no need to gc any oops that are stored in the structure.
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29
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30
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31 class LocalsClosure;
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32 class ExpressionStackClosure;
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33 class MonitorStackClosure;
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34 class MonitorArrayElement;
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35 class StackValueCollection;
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36
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37 // A vframeArrayElement is an element of a vframeArray. Each element
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38 // represent an interpreter frame which will eventually be created.
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39
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40 class vframeArrayElement : public _ValueObj {
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41 private:
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42
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43 frame _frame; // the interpreter frame we will unpack into
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44 int _bci; // raw bci for this vframe
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45 methodOop _method; // the method for this vframe
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46 MonitorChunk* _monitors; // active monitors for this vframe
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47 StackValueCollection* _locals;
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48 StackValueCollection* _expressions;
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49
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50 public:
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51
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52 frame* iframe(void) { return &_frame; }
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53
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54 int bci(void) const;
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55
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56 int raw_bci(void) const { return _bci; }
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57
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58 methodOop method(void) const { return _method; }
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59
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60 MonitorChunk* monitors(void) const { return _monitors; }
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61
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62 void free_monitors(JavaThread* jt);
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63
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64 StackValueCollection* locals(void) const { return _locals; }
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65
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66 StackValueCollection* expressions(void) const { return _expressions; }
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67
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68 void fill_in(compiledVFrame* vf);
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69
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70 // Formerly part of deoptimizedVFrame
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71
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72
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73 // Returns the on stack word size for this frame
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74 // callee_parameters is the number of callee locals residing inside this frame
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75 int on_stack_size(int callee_parameters,
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76 int callee_locals,
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77 bool is_top_frame,
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78 int popframe_extra_stack_expression_els) const;
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79
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80 // Unpacks the element to skeletal interpreter frame
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81 void unpack_on_stack(int callee_parameters,
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82 int callee_locals,
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83 frame* caller,
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84 bool is_top_frame,
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85 int exec_mode);
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86
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87 #ifndef PRODUCT
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88 void print(outputStream* st);
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89 #endif /* PRODUCT */
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90 };
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91
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92 // this can be a ResourceObj if we don't save the last one...
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93 // but it does make debugging easier even if we can't look
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94 // at the data in each vframeElement
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95
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96 class vframeArray: public CHeapObj {
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97 private:
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98
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99
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100 // Here is what a vframeArray looks like in memory
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101
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102 /*
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103 fixed part
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104 description of the original frame
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105 _frames - number of vframes in this array
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106 adapter info
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107 callee register save area
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108 variable part
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109 vframeArrayElement [ 0 ]
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110 ...
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111 vframeArrayElement [_frames - 1]
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112
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113 */
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114
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115 JavaThread* _owner_thread;
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116 vframeArray* _next;
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117 frame _original; // the original frame of the deoptee
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118 frame _caller; // caller of root frame in vframeArray
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119 frame _sender;
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120
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121 Deoptimization::UnrollBlock* _unroll_block;
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122 int _frame_size;
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123
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124 int _frames; // number of javavframes in the array (does not count any adapter)
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125
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126 intptr_t _callee_registers[RegisterMap::reg_count];
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127 unsigned char _valid[RegisterMap::reg_count];
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128
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129 vframeArrayElement _elements[1]; // First variable section.
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130
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131 void fill_in_element(int index, compiledVFrame* vf);
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132
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133 bool is_location_valid(int i) const { return _valid[i] != 0; }
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134 void set_location_valid(int i, bool valid) { _valid[i] = valid; }
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135
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136 public:
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137
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138
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139 // Tells whether index is within bounds.
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140 bool is_within_bounds(int index) const { return 0 <= index && index < frames(); }
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141
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142 // Accessores for instance variable
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143 int frames() const { return _frames; }
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144
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145 static vframeArray* allocate(JavaThread* thread, int frame_size, GrowableArray<compiledVFrame*>* chunk,
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146 RegisterMap* reg_map, frame sender, frame caller, frame self);
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147
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148
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149 vframeArrayElement* element(int index) { assert(is_within_bounds(index), "Bad index"); return &_elements[index]; }
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150
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151 // Allocates a new vframe in the array and fills the array with vframe information in chunk
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152 void fill_in(JavaThread* thread, int frame_size, GrowableArray<compiledVFrame*>* chunk, const RegisterMap *reg_map);
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153
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154 // Returns the owner of this vframeArray
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155 JavaThread* owner_thread() const { return _owner_thread; }
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156
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157 // Accessors for next
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158 vframeArray* next() const { return _next; }
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159 void set_next(vframeArray* value) { _next = value; }
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160
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161 // Accessors for sp
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162 intptr_t* sp() const { return _original.sp(); }
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163
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164 intptr_t* unextended_sp() const { return _original.unextended_sp(); }
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165
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166 address original_pc() const { return _original.pc(); }
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167
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168 frame original() const { return _original; }
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169
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170 frame caller() const { return _caller; }
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171
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172 frame sender() const { return _sender; }
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173
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174 // Accessors for unroll block
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175 Deoptimization::UnrollBlock* unroll_block() const { return _unroll_block; }
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176 void set_unroll_block(Deoptimization::UnrollBlock* block) { _unroll_block = block; }
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177
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178 // Returns the size of the frame that got deoptimized
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179 int frame_size() const { return _frame_size; }
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180
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181 // Unpack the array on the stack passed in stack interval
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182 void unpack_to_stack(frame &unpack_frame, int exec_mode);
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183
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184 // Deallocates monitor chunks allocated during deoptimization.
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185 // This should be called when the array is not used anymore.
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186 void deallocate_monitor_chunks();
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187
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188
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189
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190 // Accessor for register map
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191 address register_location(int i) const;
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192
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193 void print_on_2(outputStream* st) PRODUCT_RETURN;
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194 void print_value_on(outputStream* st) const PRODUCT_RETURN;
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195
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196 #ifndef PRODUCT
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197 // Comparing
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198 bool structural_compare(JavaThread* thread, GrowableArray<compiledVFrame*>* chunk);
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199 #endif
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200
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201 };
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