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annotate src/share/vm/oops/cpCache.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents src/share/vm/oops/cpCacheOop.hpp@1d7922586cf6
children 4bfe8b33cf66
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1 /*
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2 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_OOPS_CPCACHEOOP_HPP
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26 #define SHARE_VM_OOPS_CPCACHEOOP_HPP
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27
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28 #include "interpreter/bytecodes.hpp"
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29 #include "memory/allocation.hpp"
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30 #include "utilities/array.hpp"
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31
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32 class PSPromotionManager;
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33
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34 // A ConstantPoolCacheEntry describes an individual entry of the constant
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35 // pool cache. There's 2 principal kinds of entries: field entries for in-
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36 // stance & static field access, and method entries for invokes. Some of
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37 // the entry layout is shared and looks as follows:
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38 //
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39 // bit number |31 0|
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40 // bit length |-8--|-8--|---16----|
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41 // --------------------------------
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42 // _indices [ b2 | b1 | index ] index = constant_pool_index
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43 // _f1 [ entry specific ] metadata ptr (method or klass)
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44 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr
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45 // _flags [tos|0|F=1|0|0|f|v|0 |00000|field_index] (for field entries)
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46 // bit length [ 4 |1| 1 |1|1|1|1|1 |--5--|----16-----]
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47 // _flags [tos|0|F=0|A|I|f|0|vf|00000|00000|psize] (for method entries)
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48 // bit length [ 4 |1| 1 |1|1|1|1|1 |--5--|--8--|--8--]
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49
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50 // --------------------------------
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51 //
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52 // with:
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53 // index = original constant pool index
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54 // b1 = bytecode 1
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55 // b2 = bytecode 2
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56 // psize = parameters size (method entries only)
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57 // field_index = index into field information in holder InstanceKlass
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58 // The index max is 0xffff (max number of fields in constant pool)
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59 // and is multiplied by (InstanceKlass::next_offset) when accessing.
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60 // tos = TosState
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61 // F = the entry is for a field (or F=0 for a method)
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62 // A = call site has an appendix argument (loaded from resolved references)
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63 // I = interface call is forced virtual (must use a vtable index or vfinal)
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64 // f = field or method is final
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65 // v = field is volatile
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66 // vf = virtual but final (method entries only: is_vfinal())
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67 //
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68 // The flags after TosState have the following interpretation:
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69 // bit 27: 0 for fields, 1 for methods
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70 // f flag true if field is marked final
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71 // v flag true if field is volatile (only for fields)
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72 // f2 flag true if f2 contains an oop (e.g., virtual final method)
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73 // fv flag true if invokeinterface used for method in class Object
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74 //
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75 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the
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76 // following mapping to the TosState states:
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77 //
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78 // btos: 0
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79 // ctos: 1
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80 // stos: 2
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81 // itos: 3
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82 // ltos: 4
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83 // ftos: 5
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84 // dtos: 6
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85 // atos: 7
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86 // vtos: 8
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87 //
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88 // Entry specific: field entries:
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89 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index
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90 // _f1 = field holder (as a java.lang.Class, not a Klass*)
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91 // _f2 = field offset in bytes
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92 // _flags = field type information, original FieldInfo index in field holder
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93 // (field_index section)
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94 //
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95 // Entry specific: method entries:
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96 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section),
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97 // original constant pool index
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98 // _f1 = Method* for non-virtual calls, unused by virtual calls.
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99 // for interface calls, which are essentially virtual but need a klass,
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100 // contains Klass* for the corresponding interface.
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101 // for invokedynamic, f1 contains a site-specific CallSite object (as an appendix)
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102 // for invokehandle, f1 contains a site-specific MethodType object (as an appendix)
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103 // (upcoming metadata changes will move the appendix to a separate array)
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104 // _f2 = vtable/itable index (or final Method*) for virtual calls only,
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105 // unused by non-virtual. The is_vfinal flag indicates this is a
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106 // method pointer for a final method, not an index.
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107 // _flags = method type info (t section),
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108 // virtual final bit (vfinal),
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109 // parameter size (psize section)
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110 //
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111 // Note: invokevirtual & invokespecial bytecodes can share the same constant
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112 // pool entry and thus the same constant pool cache entry. All invoke
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113 // bytecodes but invokevirtual use only _f1 and the corresponding b1
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114 // bytecode, while invokevirtual uses only _f2 and the corresponding
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115 // b2 bytecode. The value of _flags is shared for both types of entries.
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116 //
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117 // The fields are volatile so that they are stored in the order written in the
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118 // source code. The _indices field with the bytecode must be written last.
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119
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120 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
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121 friend class VMStructs;
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122 friend class constantPoolCacheKlass;
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123 friend class ConstantPool;
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124 friend class InterpreterRuntime;
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125
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126 private:
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127 volatile intx _indices; // constant pool index & rewrite bytecodes
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128 volatile Metadata* _f1; // entry specific metadata field
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129 volatile intx _f2; // entry specific int/metadata field
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130 volatile intx _flags; // flags
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131
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132
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133 void set_bytecode_1(Bytecodes::Code code);
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134 void set_bytecode_2(Bytecodes::Code code);
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135 void set_f1(Metadata* f1) {
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136 Metadata* existing_f1 = (Metadata*)_f1; // read once
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137 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
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138 _f1 = f1;
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139 }
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140 void release_set_f1(Metadata* f1);
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141 void set_f2(intx f2) { assert(_f2 == 0 || _f2 == f2, "illegal field change"); _f2 = f2; }
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142 void set_f2_as_vfinal_method(Method* f2) { assert(_f2 == 0 || _f2 == (intptr_t) f2, "illegal field change"); assert(is_vfinal(), "flags must be set"); _f2 = (intptr_t) f2; }
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143 int make_flags(TosState state, int option_bits, int field_index_or_method_params);
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144 void set_flags(intx flags) { _flags = flags; }
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145 bool init_flags_atomic(intx flags);
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146 void set_field_flags(TosState field_type, int option_bits, int field_index) {
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147 assert((field_index & field_index_mask) == field_index, "field_index in range");
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148 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index));
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149 }
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150 void set_method_flags(TosState return_type, int option_bits, int method_params) {
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151 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
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152 set_flags(make_flags(return_type, option_bits, method_params));
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153 }
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154 bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) {
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155 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
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156 return init_flags_atomic(make_flags(return_type, option_bits, method_params));
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157 }
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158
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159 public:
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160 // specific bit definitions for the flags field:
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161 // (Note: the interpreter must use these definitions to access the CP cache.)
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162 enum {
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163 // high order bits are the TosState corresponding to field type or method return type
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164 tos_state_bits = 4,
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165 tos_state_mask = right_n_bits(tos_state_bits),
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166 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
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167 // misc. option bits; can be any bit position in [16..27]
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168 is_field_entry_shift = 26, // (F) is it a field or a method?
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169 has_appendix_shift = 25, // (A) does the call site have an appendix argument?
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170 is_forced_virtual_shift = 24, // (I) is the interface reference forced to virtual mode?
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171 is_final_shift = 23, // (f) is the field or method final?
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172 is_volatile_shift = 22, // (v) is the field volatile?
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173 is_vfinal_shift = 21, // (vf) did the call resolve to a final method?
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174 // low order bits give field index (for FieldInfo) or method parameter size:
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175 field_index_bits = 16,
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176 field_index_mask = right_n_bits(field_index_bits),
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177 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255
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178 parameter_size_mask = right_n_bits(parameter_size_bits),
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179 option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask))
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180 };
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181
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182 // specific bit definitions for the indices field:
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183 enum {
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184 cp_index_bits = 2*BitsPerByte,
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185 cp_index_mask = right_n_bits(cp_index_bits),
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186 bytecode_1_shift = cp_index_bits,
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187 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF
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188 bytecode_2_shift = cp_index_bits + BitsPerByte,
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189 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF
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190 };
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191
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192
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193 // Initialization
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194 void initialize_entry(int original_index); // initialize primary entry
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195 void initialize_resolved_reference_index(int ref_index) {
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196 assert(_f2 == 0, "set once"); // note: ref_index might be zero also
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197 _f2 = ref_index;
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198 }
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199
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200 void set_field( // sets entry to resolved field state
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201 Bytecodes::Code get_code, // the bytecode used for reading the field
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202 Bytecodes::Code put_code, // the bytecode used for writing the field
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203 KlassHandle field_holder, // the object/klass holding the field
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204 int orig_field_index, // the original field index in the field holder
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205 int field_offset, // the field offset in words in the field holder
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206 TosState field_type, // the (machine) field type
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207 bool is_final, // the field is final
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208 bool is_volatile, // the field is volatile
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209 Klass* root_klass // needed by the GC to dirty the klass
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210 );
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211
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212 void set_method( // sets entry to resolved method entry
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213 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
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214 methodHandle method, // the method/prototype if any (NULL, otherwise)
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215 int vtable_index // the vtable index if any, else negative
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216 );
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217
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218 void set_interface_call(
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219 methodHandle method, // Resolved method
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220 int index // Method index into interface
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221 );
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222
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223 void set_method_handle(
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224 methodHandle method, // adapter for invokeExact, etc.
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225 Handle appendix, // stored in refs[f2]; could be a java.lang.invoke.MethodType
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226 objArrayHandle resolved_references
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227 );
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228
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229 void set_dynamic_call(
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230 methodHandle method, // adapter for this call site
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231 Handle appendix, // stored in refs[f2]; could be a java.lang.invoke.CallSite
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232 objArrayHandle resolved_references
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233 );
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234
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235 // Common code for invokedynamic and MH invocations.
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236
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237 // The "appendix" is an optional call-site-specific parameter which is
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238 // pushed by the JVM at the end of the argument list. This argument may
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239 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic
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240 // instruction. However, its exact type and use depends on the Java upcall,
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241 // which simply returns a compiled LambdaForm along with any reference
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242 // that LambdaForm needs to complete the call. If the upcall returns a
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243 // null appendix, the argument is not passed at all.
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244 //
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245 // The appendix is *not* represented in the signature of the symbolic
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246 // reference for the call site, but (if present) it *is* represented in
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247 // the Method* bound to the site. This means that static and dynamic
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248 // resolution logic needs to make slightly different assessments about the
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249 // number and types of arguments.
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250 void set_method_handle_common(
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251 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic
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252 methodHandle adapter, // invoker method (f1)
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253 Handle appendix, // appendix such as CallSite, MethodType, etc. (refs[f2])
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254 objArrayHandle resolved_references
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255 );
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256
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257 Method* method_if_resolved(constantPoolHandle cpool);
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258 oop appendix_if_resolved(constantPoolHandle cpool);
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259
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260 void set_parameter_size(int value);
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261
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262 // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
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263 // Returns -1 if neither is valid.
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264 static int bytecode_number(Bytecodes::Code code) {
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265 switch (code) {
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266 case Bytecodes::_getstatic : // fall through
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267 case Bytecodes::_getfield : // fall through
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268 case Bytecodes::_invokespecial : // fall through
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269 case Bytecodes::_invokestatic : // fall through
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270 case Bytecodes::_invokeinterface : return 1;
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271 case Bytecodes::_putstatic : // fall through
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272 case Bytecodes::_putfield : // fall through
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273 case Bytecodes::_invokehandle : // fall through
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274 case Bytecodes::_invokedynamic : // fall through
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275 case Bytecodes::_invokevirtual : return 2;
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276 default : break;
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277 }
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278 return -1;
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279 }
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280
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281 // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
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282 bool is_resolved(Bytecodes::Code code) const {
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283 switch (bytecode_number(code)) {
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284 case 1: return (bytecode_1() == code);
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285 case 2: return (bytecode_2() == code);
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286 }
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287 return false; // default: not resolved
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288 }
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289
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290 // Accessors
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291 int indices() const { return _indices; }
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292 int constant_pool_index() const { return (indices() & cp_index_mask); }
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293 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((indices() >> bytecode_1_shift) & bytecode_1_mask); }
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294 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((indices() >> bytecode_2_shift) & bytecode_2_mask); }
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295 Method* f1_as_method() const { Metadata* f1 = (Metadata*)_f1; assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; }
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296 Klass* f1_as_klass() const { Metadata* f1 = (Metadata*)_f1; assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; }
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297 bool is_f1_null() const { Metadata* f1 = (Metadata*)_f1; return f1 == NULL; } // classifies a CPC entry as unbound
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298 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; }
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299 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; }
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300 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); }
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301 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
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302 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; }
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303 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; }
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304 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
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305 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; }
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306 bool has_appendix() const { return (_flags & (1 << has_appendix_shift)) != 0; }
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307 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; }
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308 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; }
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309 bool is_byte() const { return flag_state() == btos; }
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310 bool is_char() const { return flag_state() == ctos; }
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311 bool is_short() const { return flag_state() == stos; }
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312 bool is_int() const { return flag_state() == itos; }
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313 bool is_long() const { return flag_state() == ltos; }
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314 bool is_float() const { return flag_state() == ftos; }
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315 bool is_double() const { return flag_state() == dtos; }
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316 bool is_object() const { return flag_state() == atos; }
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317 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
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318 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
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319
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320 // Code generation support
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321 static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); }
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322 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
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323 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
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324 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
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325 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
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326 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
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327
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328 // RedefineClasses() API support:
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329 // If this constantPoolCacheEntry refers to old_method then update it
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330 // to refer to new_method.
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331 // trace_name_printed is set to true if the current call has
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332 // printed the klass name so that other routines in the adjust_*
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333 // group don't print the klass name.
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334 bool adjust_method_entry(Method* old_method, Method* new_method,
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335 bool * trace_name_printed);
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336 NOT_PRODUCT(bool check_no_old_entries();)
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337 bool is_interesting_method_entry(Klass* k);
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338
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339 // Debugging & Printing
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340 void print (outputStream* st, int index) const;
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341 void verify(outputStream* st) const;
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342
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343 static void verify_tos_state_shift() {
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344 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state:
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345 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask");
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346 }
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347 };
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348
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349
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350 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
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351 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
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352 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
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353 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
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354
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355 class ConstantPoolCache: public MetaspaceObj {
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356 friend class VMStructs;
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357 friend class MetadataFactory;
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358 private:
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359 int _length;
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360 ConstantPool* _constant_pool; // the corresponding constant pool
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361
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362 // Sizing
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363 debug_only(friend class ClassVerifier;)
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364
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365 // Constructor
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366 ConstantPoolCache(int length) : _length(length), _constant_pool(NULL) {
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367 for (int i = 0; i < length; i++) {
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368 assert(entry_at(i)->is_f1_null(), "Failed to clear?");
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369 }
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370 }
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371
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372 public:
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373 static ConstantPoolCache* allocate(ClassLoaderData* loader_data, int length, TRAPS);
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374 bool is_constantPoolCache() const { return true; }
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375
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376 int length() const { return _length; }
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377 private:
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378 void set_length(int length) { _length = length; }
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379
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380 static int header_size() { return sizeof(ConstantPoolCache) / HeapWordSize; }
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381 static int size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
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382 public:
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383 int size() const { return size(length()); }
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384 private:
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385
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386 // Helpers
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387 ConstantPool** constant_pool_addr() { return &_constant_pool; }
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388 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
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389
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390 friend class constantPoolCacheKlass;
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391 friend class ConstantPoolCacheEntry;
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392
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393 public:
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394 // Initialization
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395 void initialize(intArray& inverse_index_map, intArray& invokedynamic_references_map);
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396
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397 // Accessors
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398 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; }
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399 ConstantPool* constant_pool() const { return _constant_pool; }
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400 // Fetches the entry at the given index.
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401 // In either case the index must not be encoded or byte-swapped in any way.
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402 ConstantPoolCacheEntry* entry_at(int i) const {
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403 assert(0 <= i && i < length(), "index out of bounds");
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404 return base() + i;
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405 }
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406
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407 // Code generation
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408 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); }
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409 static ByteSize entry_offset(int raw_index) {
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410 int index = raw_index;
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411 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
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412 }
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413
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414 // RedefineClasses() API support:
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415 // If any entry of this constantPoolCache points to any of
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416 // old_methods, replace it with the corresponding new_method.
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417 // trace_name_printed is set to true if the current call has
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418 // printed the klass name so that other routines in the adjust_*
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419 // group don't print the klass name.
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420 void adjust_method_entries(Method** old_methods, Method** new_methods,
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421 int methods_length, bool * trace_name_printed);
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422 NOT_PRODUCT(bool check_no_old_entries();)
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423
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424 // Deallocate - no fields to deallocate
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425 DEBUG_ONLY(bool on_stack() { return false; })
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426 void deallocate_contents(ClassLoaderData* data) {}
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427 bool is_klass() const { return false; }
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428
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429 // Printing
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430 void print_on(outputStream* st) const;
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431 void print_value_on(outputStream* st) const;
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432
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433 const char* internal_name() const { return "{constant pool cache}"; }
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434
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435 // Verify
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436 void verify_on(outputStream* st);
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437 };
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438
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439 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP