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1 /*
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2 * Copyright 1998-2007 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 // Interface for generating the frame map for compiled code. A frame map
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26 // describes for a specific pc whether each register and frame stack slot is:
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27 // Oop - A GC root for current frame
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28 // Value - Live non-oop, non-float value: int, either half of double
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29 // Dead - Dead; can be Zapped for debugging
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30 // CalleeXX - Callee saved; also describes which caller register is saved
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31 // DerivedXX - A derived oop; original oop is described.
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32 //
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33 // OopMapValue describes a single OopMap entry
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34
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35 class frame;
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36 class RegisterMap;
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37 class DerivedPointerEntry;
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38
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39 class OopMapValue: public StackObj {
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40 friend class VMStructs;
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41 private:
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42 short _value;
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43 int value() const { return _value; }
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44 void set_value(int value) { _value = value; }
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45 short _content_reg;
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46
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47 public:
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48 // Constants
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49 enum { type_bits = 6,
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50 register_bits = BitsPerShort - type_bits };
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51
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52 enum { type_shift = 0,
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53 register_shift = type_bits };
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54
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55 enum { type_mask = right_n_bits(type_bits),
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56 type_mask_in_place = type_mask << type_shift,
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57 register_mask = right_n_bits(register_bits),
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58 register_mask_in_place = register_mask << register_shift };
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59
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60 enum oop_types { // must fit in type_bits
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61 unused_value =0, // powers of 2, for masking OopMapStream
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62 oop_value = 1,
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63 value_value = 2,
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64 dead_value = 4,
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65 callee_saved_value = 8,
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66 derived_oop_value= 16,
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67 stack_obj = 32 };
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68
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69 // Constructors
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70 OopMapValue () { set_value(0); set_content_reg(VMRegImpl::Bad()); }
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71 OopMapValue (VMReg reg, oop_types t) { set_reg_type(reg,t); }
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72 OopMapValue (VMReg reg, oop_types t, VMReg reg2) { set_reg_type(reg,t); set_content_reg(reg2); }
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73 OopMapValue (CompressedReadStream* stream) { read_from(stream); }
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74
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75 // Archiving
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76 void write_on(CompressedWriteStream* stream) {
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77 stream->write_int(value());
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78 if(is_callee_saved() || is_derived_oop()) {
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79 stream->write_int(content_reg()->value());
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80 }
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81 }
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82
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83 void read_from(CompressedReadStream* stream) {
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84 set_value(stream->read_int());
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85 if(is_callee_saved() || is_derived_oop()) {
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86 set_content_reg(VMRegImpl::as_VMReg(stream->read_int(), true));
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87 }
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88 }
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89
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90 // Querying
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91 bool is_oop() { return mask_bits(value(), type_mask_in_place) == oop_value; }
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92 bool is_value() { return mask_bits(value(), type_mask_in_place) == value_value; }
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93 bool is_dead() { return mask_bits(value(), type_mask_in_place) == dead_value; }
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94 bool is_callee_saved() { return mask_bits(value(), type_mask_in_place) == callee_saved_value; }
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95 bool is_derived_oop() { return mask_bits(value(), type_mask_in_place) == derived_oop_value; }
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96 bool is_stack_obj() { return mask_bits(value(), type_mask_in_place) == stack_obj; }
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97
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98 void set_oop() { set_value((value() & register_mask_in_place) | oop_value); }
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99 void set_value() { set_value((value() & register_mask_in_place) | value_value); }
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100 void set_dead() { set_value((value() & register_mask_in_place) | dead_value); }
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101 void set_callee_saved() { set_value((value() & register_mask_in_place) | callee_saved_value); }
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102 void set_derived_oop() { set_value((value() & register_mask_in_place) | derived_oop_value); }
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103 void set_stack_obj() { set_value((value() & register_mask_in_place) | stack_obj); }
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104
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105 VMReg reg() const { return VMRegImpl::as_VMReg(mask_bits(value(), register_mask_in_place) >> register_shift); }
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106 oop_types type() const { return (oop_types)mask_bits(value(), type_mask_in_place); }
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107
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108 static bool legal_vm_reg_name(VMReg p) {
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109 return (p->value() == (p->value() & register_mask));
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110 }
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111
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112 void set_reg_type(VMReg p, oop_types t) {
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113 set_value((p->value() << register_shift) | t);
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114 assert(reg() == p, "sanity check" );
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115 assert(type() == t, "sanity check" );
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116 }
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117
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118
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119 VMReg content_reg() const { return VMRegImpl::as_VMReg(_content_reg, true); }
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120 void set_content_reg(VMReg r) { _content_reg = r->value(); }
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121
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122 // Physical location queries
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123 bool is_register_loc() { return reg()->is_reg(); }
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124 bool is_stack_loc() { return reg()->is_stack(); }
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125
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126 // Returns offset from sp.
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127 int stack_offset() {
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128 assert(is_stack_loc(), "must be stack location");
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129 return reg()->reg2stack();
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130 }
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131
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132 void print( ) const PRODUCT_RETURN;
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133 };
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134
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135
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136 class OopMap: public ResourceObj {
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137 friend class OopMapStream;
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138 friend class VMStructs;
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139 private:
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140 int _pc_offset;
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141 int _omv_count;
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142 int _omv_data_size;
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143 unsigned char* _omv_data;
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144 CompressedWriteStream* _write_stream;
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145
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146 debug_only( OopMapValue::oop_types* _locs_used; int _locs_length;)
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147
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148 // Accessors
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149 unsigned char* omv_data() const { return _omv_data; }
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150 void set_omv_data(unsigned char* value) { _omv_data = value; }
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151 int omv_data_size() const { return _omv_data_size; }
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152 void set_omv_data_size(int value) { _omv_data_size = value; }
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153 int omv_count() const { return _omv_count; }
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154 void set_omv_count(int value) { _omv_count = value; }
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155 void increment_count() { _omv_count++; }
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156 CompressedWriteStream* write_stream() const { return _write_stream; }
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157 void set_write_stream(CompressedWriteStream* value) { _write_stream = value; }
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158
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159 private:
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160 enum DeepCopyToken { _deep_copy_token };
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161 OopMap(DeepCopyToken, OopMap* source); // used only by deep_copy
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162
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163 public:
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164 OopMap(int frame_size, int arg_count);
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165
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166 // pc-offset handling
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167 int offset() const { return _pc_offset; }
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168 void set_offset(int o) { _pc_offset = o; }
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169
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170 // Check to avoid double insertion
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171 debug_only(OopMapValue::oop_types locs_used( int indx ) { return _locs_used[indx]; })
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172
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173 // Construction
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174 // frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd
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175 // slots to hold 4-byte values like ints and floats in the LP64 build.
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176 void set_oop ( VMReg local);
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177 void set_value( VMReg local);
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178 void set_dead ( VMReg local);
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179 void set_callee_saved( VMReg local, VMReg caller_machine_register );
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180 void set_derived_oop ( VMReg local, VMReg derived_from_local_register );
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181 void set_stack_obj( VMReg local);
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182 void set_xxx(VMReg reg, OopMapValue::oop_types x, VMReg optional);
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183
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184 int heap_size() const;
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185 void copy_to(address addr);
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186 OopMap* deep_copy();
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187
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188 bool has_derived_pointer() const PRODUCT_RETURN0;
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189
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190 bool legal_vm_reg_name(VMReg local) {
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191 return OopMapValue::legal_vm_reg_name(local);
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192 }
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193
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194 // Printing
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195 void print_on(outputStream* st) const PRODUCT_RETURN;
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196 void print() const { print_on(tty); }
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197 };
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198
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199
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200 class OopMapSet : public ResourceObj {
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201 friend class VMStructs;
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202 private:
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203 int _om_count;
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204 int _om_size;
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205 OopMap** _om_data;
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206
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207 int om_count() const { return _om_count; }
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208 void set_om_count(int value) { _om_count = value; }
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209 void increment_count() { _om_count++; }
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210 int om_size() const { return _om_size; }
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211 void set_om_size(int value) { _om_size = value; }
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212 OopMap** om_data() const { return _om_data; }
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213 void set_om_data(OopMap** value) { _om_data = value; }
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214 void grow_om_data();
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215 void set(int index,OopMap* value) { assert((index == 0) || ((index > 0) && (index < om_size())),"bad index"); _om_data[index] = value; }
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216
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217 public:
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218 OopMapSet();
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219
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220 // returns the number of OopMaps in this OopMapSet
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221 int size() const { return _om_count; }
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222 // returns the OopMap at a given index
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223 OopMap* at(int index) const { assert((index >= 0) && (index <= om_count()),"bad index"); return _om_data[index]; }
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224
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225 // Collect OopMaps.
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226 void add_gc_map(int pc, OopMap* map);
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227
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228 // Returns the only oop map. Used for reconstructing
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229 // Adapter frames during deoptimization
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230 OopMap* singular_oop_map();
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231
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232 // returns OopMap in that is anchored to the pc
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233 OopMap* find_map_at_offset(int pc_offset) const;
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234
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235 int heap_size() const;
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236 void copy_to(address addr);
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237
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238 // Iterates through frame for a compiled method
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239 static void oops_do (const frame* fr,
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240 const RegisterMap* reg_map, OopClosure* f);
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241 static void update_register_map(const frame* fr, RegisterMap *reg_map);
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242
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243 // Iterates through frame for a compiled method for dead ones and values, too
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244 static void all_do(const frame* fr, const RegisterMap* reg_map,
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245 OopClosure* oop_fn,
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246 void derived_oop_fn(oop* base, oop* derived),
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247 OopClosure* value_fn, OopClosure* dead_fn);
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248
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249 // Printing
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250 void print_on(outputStream* st) const PRODUCT_RETURN;
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251 void print() const { print_on(tty); }
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252 };
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253
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254
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255 class OopMapStream : public StackObj {
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256 private:
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257 CompressedReadStream* _stream;
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258 int _mask;
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259 int _size;
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260 int _position;
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261 bool _valid_omv;
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262 OopMapValue _omv;
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263 void find_next();
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264
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265 public:
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266 OopMapStream(OopMap* oop_map);
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267 OopMapStream(OopMap* oop_map, int oop_types_mask);
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268 bool is_done() { if(!_valid_omv) { find_next(); } return !_valid_omv; }
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269 void next() { find_next(); }
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270 OopMapValue current() { return _omv; }
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271 };
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272
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273
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274 // Derived pointer support. This table keeps track of all derived points on a
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275 // stack. It is cleared before each scavenge/GC. During the traversal of all
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276 // oops, it is filled in with references to all locations that contains a
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277 // derived oop (assumed to be very few). When the GC is complete, the derived
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278 // pointers are updated based on their base pointers new value and an offset.
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279 #ifdef COMPILER2
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280 class DerivedPointerTable : public AllStatic {
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281 friend class VMStructs;
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282 private:
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283 static GrowableArray<DerivedPointerEntry*>* _list;
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284 static bool _active; // do not record pointers for verify pass etc.
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285 public:
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286 static void clear(); // Called before scavenge/GC
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287 static void add(oop *derived, oop *base); // Called during scavenge/GC
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288 static void update_pointers(); // Called after scavenge/GC
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289 static bool is_empty() { return _list == NULL || _list->is_empty(); }
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290 static bool is_active() { return _active; }
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291 static void set_active(bool value) { _active = value; }
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292 };
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293
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294 // A utility class to temporarily "deactivate" the DerivedPointerTable.
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295 // (Note: clients are responsible for any MT-safety issues)
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296 class DerivedPointerTableDeactivate: public StackObj {
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297 private:
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298 bool _active;
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299 public:
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300 DerivedPointerTableDeactivate() {
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301 _active = DerivedPointerTable::is_active();
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302 if (_active) {
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303 DerivedPointerTable::set_active(false);
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304 }
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305 }
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306
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307 ~DerivedPointerTableDeactivate() {
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308 assert(!DerivedPointerTable::is_active(),
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309 "Inconsistency: not MT-safe");
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310 if (_active) {
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311 DerivedPointerTable::set_active(true);
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312 }
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313 }
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314 };
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315 #endif // COMPILER2
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