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1 /*
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2 * Copyright 1998-2006 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 ConstantPoolCacheEntry describes an individual entry of the constant
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26 // pool cache. There's 2 principal kinds of entries: field entries for in-
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27 // stance & static field access, and method entries for invokes. Some of
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28 // the entry layout is shared and looks as follows:
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29 //
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30 // bit number |31 0|
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31 // bit length |-8--|-8--|---16----|
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32 // --------------------------------
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33 // _indices [ b2 | b1 | index ]
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34 // _f1 [ entry specific ]
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35 // _f2 [ entry specific ]
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36 // _flags [t|f|vf|v|m|h|unused|field_index] (for field entries)
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37 // bit length |4|1|1 |1|1|0|---7--|----16-----]
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38 // _flags [t|f|vf|v|m|h|unused|eidx|psze] (for method entries)
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39 // bit length |4|1|1 |1|1|1|---7--|-8--|-8--]
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40
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41 // --------------------------------
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42 //
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43 // with:
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44 // index = original constant pool index
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45 // b1 = bytecode 1
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46 // b2 = bytecode 2
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47 // psze = parameters size (method entries only)
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48 // eidx = interpreter entry index (method entries only)
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49 // field_index = index into field information in holder instanceKlass
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50 // The index max is 0xffff (max number of fields in constant pool)
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51 // and is multiplied by (instanceKlass::next_offset) when accessing.
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52 // t = TosState (see below)
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53 // f = field is marked final (see below)
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54 // vf = virtual, final (method entries only : is_vfinal())
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55 // v = field is volatile (see below)
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56 // m = invokeinterface used for method in class Object (see below)
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57 // h = RedefineClasses/Hotswap bit (see below)
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58 //
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59 // The flags after TosState have the following interpretation:
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60 // bit 27: f flag true if field is marked final
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61 // bit 26: vf flag true if virtual final method
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62 // bit 25: v flag true if field is volatile (only for fields)
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63 // bit 24: m flag true if invokeinterface used for method in class Object
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64 // bit 23: 0 for fields, 1 for methods
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65 //
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66 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the
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67 // following mapping to the TosState states:
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68 //
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69 // btos: 0
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70 // ctos: 1
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71 // stos: 2
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72 // itos: 3
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73 // ltos: 4
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74 // ftos: 5
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75 // dtos: 6
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76 // atos: 7
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77 // vtos: 8
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78 //
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79 // Entry specific: field entries:
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80 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index
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81 // _f1 = field holder
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82 // _f2 = field offset in words
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83 // _flags = field type information, original field index in field holder
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84 // (field_index section)
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85 //
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86 // Entry specific: method entries:
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87 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section),
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88 // original constant pool index
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89 // _f1 = method for all but virtual calls, unused by virtual calls
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90 // (note: for interface calls, which are essentially virtual,
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91 // contains klassOop for the corresponding interface.
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92 // _f2 = method/vtable index for virtual calls only, unused by all other
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93 // calls. The vf flag indicates this is a method pointer not an
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94 // index.
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95 // _flags = field type info (f section),
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96 // virtual final entry (vf),
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97 // interpreter entry index (eidx section),
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98 // parameter size (psze section)
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99 //
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100 // Note: invokevirtual & invokespecial bytecodes can share the same constant
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101 // pool entry and thus the same constant pool cache entry. All invoke
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102 // bytecodes but invokevirtual use only _f1 and the corresponding b1
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103 // bytecode, while invokevirtual uses only _f2 and the corresponding
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104 // b2 bytecode. The value of _flags is shared for both types of entries.
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105 //
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106 // The fields are volatile so that they are stored in the order written in the
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107 // source code. The _indices field with the bytecode must be written last.
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108
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109 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
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110 friend class VMStructs;
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111 private:
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112 volatile intx _indices; // constant pool index & rewrite bytecodes
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113 volatile oop _f1; // entry specific oop field
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114 volatile intx _f2; // entry specific int/oop field
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115 volatile intx _flags; // flags
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116
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117
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118 #ifdef ASSERT
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119 bool same_methodOop(oop cur_f1, oop f1);
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120 #endif
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121
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122 void set_bytecode_1(Bytecodes::Code code);
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123 void set_bytecode_2(Bytecodes::Code code);
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124 void set_f1(oop f1) {
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125 oop existing_f1 = _f1; // read once
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126 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
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127 oop_store(&_f1, f1);
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128 }
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129 void set_f2(intx f2) { assert(_f2 == 0 || _f2 == f2, "illegal field change"); _f2 = f2; }
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130 int as_flags(TosState state, bool is_final, bool is_vfinal, bool is_volatile,
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131 bool is_method_interface, bool is_method);
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132 void set_flags(intx flags) { _flags = flags; }
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133
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134 public:
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135 // specific bit values in flag field
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136 // Note: the interpreter knows this layout!
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137 enum FlagBitValues {
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138 hotSwapBit = 23,
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139 methodInterface = 24,
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140 volatileField = 25,
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141 vfinalMethod = 26,
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142 finalField = 27
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143 };
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144
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145 enum { field_index_mask = 0xFFFF };
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146
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147 // start of type bits in flags
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148 // Note: the interpreter knows this layout!
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149 enum FlagValues {
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150 tosBits = 28
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151 };
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152
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153 // Initialization
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154 void set_initial_state(int index); // sets entry to initial state
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155
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156 void set_field( // sets entry to resolved field state
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157 Bytecodes::Code get_code, // the bytecode used for reading the field
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158 Bytecodes::Code put_code, // the bytecode used for writing the field
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159 KlassHandle field_holder, // the object/klass holding the field
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160 int orig_field_index, // the original field index in the field holder
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161 int field_offset, // the field offset in words in the field holder
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162 TosState field_type, // the (machine) field type
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163 bool is_final, // the field is final
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164 bool is_volatile // the field is volatile
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165 );
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166
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167 void set_method( // sets entry to resolved method entry
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168 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
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169 methodHandle method, // the method/prototype if any (NULL, otherwise)
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170 int vtable_index // the vtable index if any, else negative
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171 );
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172
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173 void set_interface_call(
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174 methodHandle method, // Resolved method
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175 int index // Method index into interface
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176 );
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177
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178 void set_parameter_size(int value) {
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179 assert(parameter_size() == 0 || parameter_size() == value,
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180 "size must not change");
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181 // Setting the parameter size by itself is only safe if the
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182 // current value of _flags is 0, otherwise another thread may have
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183 // updated it and we don't want to overwrite that value. Don't
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184 // bother trying to update it once it's nonzero but always make
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185 // sure that the final parameter size agrees with what was passed.
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186 if (_flags == 0) {
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187 Atomic::cmpxchg_ptr((value & 0xFF), &_flags, 0);
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188 }
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189 guarantee(parameter_size() == value, "size must not change");
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190 }
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191
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192 // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
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193 // Returns -1 if neither is valid.
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194 static int bytecode_number(Bytecodes::Code code) {
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195 switch (code) {
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196 case Bytecodes::_getstatic : // fall through
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197 case Bytecodes::_getfield : // fall through
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198 case Bytecodes::_invokespecial : // fall through
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199 case Bytecodes::_invokestatic : // fall through
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200 case Bytecodes::_invokeinterface : return 1;
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201 case Bytecodes::_putstatic : // fall through
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202 case Bytecodes::_putfield : // fall through
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203 case Bytecodes::_invokevirtual : return 2;
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204 default : break;
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205 }
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206 return -1;
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207 }
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208
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209 // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
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210 bool is_resolved(Bytecodes::Code code) const {
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211 switch (bytecode_number(code)) {
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212 case 1: return (bytecode_1() == code);
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213 case 2: return (bytecode_2() == code);
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214 }
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215 return false; // default: not resolved
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216 }
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217
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218 // Accessors
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219 int constant_pool_index() const { return _indices & 0xFFFF; }
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220 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((_indices >> 16) & 0xFF); }
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221 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((_indices >> 24) & 0xFF); }
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222 volatile oop f1() const { return _f1; }
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223 intx f2() const { return _f2; }
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224 int field_index() const;
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225 int parameter_size() const { return _flags & 0xFF; }
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226 bool is_vfinal() const { return ((_flags & (1 << vfinalMethod)) == (1 << vfinalMethod)); }
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227 bool is_volatile() const { return ((_flags & (1 << volatileField)) == (1 << volatileField)); }
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228 bool is_methodInterface() const { return ((_flags & (1 << methodInterface)) == (1 << methodInterface)); }
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229 bool is_byte() const { return (((uintx) _flags >> tosBits) == btos); }
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230 bool is_char() const { return (((uintx) _flags >> tosBits) == ctos); }
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231 bool is_short() const { return (((uintx) _flags >> tosBits) == stos); }
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232 bool is_int() const { return (((uintx) _flags >> tosBits) == itos); }
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233 bool is_long() const { return (((uintx) _flags >> tosBits) == ltos); }
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234 bool is_float() const { return (((uintx) _flags >> tosBits) == ftos); }
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235 bool is_double() const { return (((uintx) _flags >> tosBits) == dtos); }
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236 bool is_object() const { return (((uintx) _flags >> tosBits) == atos); }
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237 TosState flag_state() const { assert( ( (_flags >> tosBits) & 0x0F ) < number_of_states, "Invalid state in as_flags");
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238 return (TosState)((_flags >> tosBits) & 0x0F); }
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239
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240 // Code generation support
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241 static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); }
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242 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
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243 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
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244 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
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245 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
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246
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247 // GC Support
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248 void oops_do(void f(oop*));
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249 void oop_iterate(OopClosure* blk);
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250 void oop_iterate_m(OopClosure* blk, MemRegion mr);
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251 void follow_contents();
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252 void adjust_pointers();
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253
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254 #ifndef SERIALGC
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255 // Parallel Old
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256 void follow_contents(ParCompactionManager* cm);
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257 #endif // SERIALGC
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258
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259 void update_pointers();
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260 void update_pointers(HeapWord* beg_addr, HeapWord* end_addr);
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261
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262 // RedefineClasses() API support:
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263 // If this constantPoolCacheEntry refers to old_method then update it
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264 // to refer to new_method.
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265 // trace_name_printed is set to true if the current call has
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266 // printed the klass name so that other routines in the adjust_*
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267 // group don't print the klass name.
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268 bool adjust_method_entry(methodOop old_method, methodOop new_method,
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269 bool * trace_name_printed);
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270 bool is_interesting_method_entry(klassOop k);
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271 bool is_field_entry() const { return (_flags & (1 << hotSwapBit)) == 0; }
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272 bool is_method_entry() const { return (_flags & (1 << hotSwapBit)) != 0; }
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273
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274 // Debugging & Printing
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275 void print (outputStream* st, int index) const;
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276 void verify(outputStream* st) const;
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277
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278 static void verify_tosBits() {
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279 assert(tosBits == 28, "interpreter now assumes tosBits is 28");
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280 }
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281 };
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282
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283
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284 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
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285 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
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286 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
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287 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
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288
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289 class constantPoolCacheOopDesc: public arrayOopDesc {
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290 friend class VMStructs;
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291 private:
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292 constantPoolOop _constant_pool; // the corresponding constant pool
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293
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294 // Sizing
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295 static int header_size() { return sizeof(constantPoolCacheOopDesc) / HeapWordSize; }
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296 static int object_size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
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297 int object_size() { return object_size(length()); }
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298
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299 // Helpers
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300 constantPoolOop* constant_pool_addr() { return &_constant_pool; }
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301 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
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302
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303 friend class constantPoolCacheKlass;
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304
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305 public:
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306 // Initialization
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307 void initialize(intArray& inverse_index_map);
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308
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309 // Accessors
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310 void set_constant_pool(constantPoolOop pool) { oop_store_without_check((oop*)&_constant_pool, (oop)pool); }
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311 constantPoolOop constant_pool() const { return _constant_pool; }
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312 ConstantPoolCacheEntry* entry_at(int i) const { assert(0 <= i && i < length(), "index out of bounds"); return base() + i; }
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313
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314 // Code generation
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315 static ByteSize base_offset() { return in_ByteSize(sizeof(constantPoolCacheOopDesc)); }
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316
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317 // RedefineClasses() API support:
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318 // If any entry of this constantPoolCache points to any of
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319 // old_methods, replace it with the corresponding new_method.
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320 // trace_name_printed is set to true if the current call has
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321 // printed the klass name so that other routines in the adjust_*
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322 // group don't print the klass name.
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323 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods,
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324 int methods_length, bool * trace_name_printed);
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325 };
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